Journal articles: 'Titanium dioxide nanoparticles'

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Mohammed, Tawfik Mahmood. "Mathematical modeling of the electronic structure of Titanium dioxide \((TiO_2 )_6\) nanoparticles." University of Aden Journal of Natural and Applied Sciences 24, no. 2 (March 22, 2022): 519–26. http://dx.doi.org/10.47372/uajnas.2020.n2.a19.

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The calculation of the number of atoms of the given dimensional nanoparticle, composed of different type atoms has been researched in this work. The calculations have been carried out for nanoparticles of titanium dioxide. Theoretical visual models have been configured, and quantum – mechanical calculations have been carried out for \((TiO_2 )_6\) nanoparticle. The calculations for titanium dioxide nanoparticle have been carried out on the basis of Gaussian atomic orbitals. Besides, Gaussian functions have been used as atomic orbitals. The numerical values of unknown coefficients of the linear combination of atomic orbitals of the atoms of the titanium nanoparticle have been found from the solution of Hartree–Fock–Roothaan (HFR) equations.The values of orbital energies, ionization potential, and the total electronic energy of titanium dioxide nanoparticles have been determined. The calculations show that ,titanium dioxide nanoparticle is tough, electrophile, and stable dielectric, material. The effective charge of atoms have been calculated, and the theoretical visual mode of titanium dioxide nanopartical have been constructed.

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Sen, Sudipta, and N. B. Manik. "Effect of Different Concentrations of Titanium Dioxide Nanoparticles on the Potential Barrier of Organic Device." European Journal of Formal Sciences and Engineering 4, no. 1 (May 15, 2021): 1. http://dx.doi.org/10.26417/633bir74y.

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Present work has studied potential barrier of Phenosafranin dye based organic device and has observed influence of different concentrations of titanium dioxide nanoparticles on this parameter. We have made different devices by taking different weight ratios of the dye – nanoparticles blend which are 1:1, 1:2, 1:3 and 1:4. These organic devices have been formed by varying the concentrations of titanium dioxide nanoparticles keeping same dye content. One device is also formed without any nanoparticle to compare influence of nanoparticle on potential barrier of the device. These devices are formed by sandwiching the dye – nanoparticle blend in between the Indium Tin Oxide coated glass and Aluminium coated mylar sheet. The potential barrier is measured from device’s I-V plot and also by Norde function. These two methods remain in good agreement showing that potential barrier is mostly decreased when the concentration of the titanium dioxide nanoparticles is highest in the blend of Phenosafranin dye and titanium dioxide nanoparticles. The ratio of dye –nanoparticle blend of 1:4 shows lowest potential barrier and it is highest when Phenosafranin dye based organic device is made without any nanoparticle. The reduced potential barrier in the presence of higher concentration of nanoparticles can be ascribed to improved filling of traps. Lowered potential barrier at metal – organic contact will improve the charge flow resulting in better performance of the device.

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G, Ramya, and Arvina Rajasekar. "Enhanced Antibacterial Effect of Titanium Dioxide Nanoparticles Mediated Grape Seed Extract on Oral Pathogens - Streptococcus mutans and Lactobacillus." Journal of Evolution of Medical and Dental Sciences 10, no. 22 (May 31, 2021): 1656–61. http://dx.doi.org/10.14260/jemds/2021/344.

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BACKGROUND Streptococcus mutans is the primary pathogen responsible for initiating dental caries and decay. Lactobacilli present in caries lesions is a major contributor to caries progression. Titanium dioxide nanoparticles have been found to have a large spectrum of activity against microorganisms. The grape seed extract has been shown to have inhibitory effects against several clinically important microbes. This study was conducted to assess the enhanced antibacterial effect of titanium dioxide nanoparticles mediated grape seed extract against oral pathogens, S. mutans and lactobacillus. METHODS This experimental study was done by preparing the grape seed extract, synthesising titanium dioxide (TiO2) nanoparticles, preparing the nanoparticles powder, and then evaluating the antibacterial activity of nanoparticles against lactobacillus species and Streptococcus mutans. RESULTS The peak found in the spectroscopy indicates the formation of titanium dioxide nanoparticles. The zone of inhibition for antibiotics enhanced with 50 μl, 100 μl, 150 μl of grape seed mediated TiO2 nanoparticles were 16 mm, 18 mm and 19 mm in Streptococcus mutans. In lactobacillus species the zone of inhibition for standard antibiotics enhanced with 50 μl, 100 μl, 150 μl of grape seed mediated TiO2 nanoparticles remained constant at 35 mm. CONCLUSIONS The titanium dioxide nanoparticle mediated grape-seed extract showed excellent antimicrobial activity against lactobacillus and Streptococcus mutans. This proves that in future it can be used for treating these bacterial infections in the oral cavity after further in vivo studies. KEY WORDS Nanotechnology, Titanium Dioxide Nanoparticles, Grape Seed Extract, Lactobacillus, Enhanced Antibacterial, S. mutans

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Sooknoi, Tawan, Siriya Jiamesakul, Sitthisuntron Supothina, Angkhana Jaroenworaluck, Thammarat Panyathanmaporn, and Kannikar Juengsuwattananon. "G-1 Metal-loaded Titanium Dioxide Nanoparticles as Oxidation Catalyst(Session: Titanium Oxide)." Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 126–27. http://dx.doi.org/10.1299/jsmeasmp.2006.126.

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Maltanava, Hanna M., Nadzeya Yu Brezhneva, Alexander V. Mazanik, Semyon O. Mazheika, Tatiana V. Gaevskaya, Ekaterina V. Skorb, and Sergey K. Poznyak. "Electrocatalysis of oxygen reduction reaction on gold nanoparticles modified titanium dioxide films with different morphology." Journal of the Belarusian State University. Chemistry, no. 2 (August 25, 2020): 63–75. http://dx.doi.org/10.33581/2520-257x-2020-2-63-75.

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Dense and mesoporous titanium dioxide films have been obtained on titanium substrate by means of thermal oxidation, hydrolysis of polybutyltitanate, deposition of titanium dioxide sol, ultrasonic treatment and anodic oxidation and characterized by scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. Electrochemical activity of titanium dioxide films, initial and modified by gold nanoparticles, in oxygen reduction reaction (ORR) in alkaline medium has been studied by cyclic voltammetry. It has been demonstrated that the efficiency of the dense and mesoporous titanium dioxide films in ORR is determined by their morphology, structure and pore ordering degree. Modification of titanium dioxide films by gold nanoparticles results in the decrease in overpotential of the ORR. It has been found that the electrodes consisted of highly ordered layers of titania nanotubes with deposited gold nanoparticles demonstrate sufficiently higher electrocatalytic activity toward the oxygen electroreduction in comparison with TiO2/Au systems based on dense films and mesoporous films with disordered pore structure. Features of electrochemical behavior of TiO2/Au (nanotubes/nanoparticles) system are explained by the peculiarities of electron transport to the electrode surface and structure of space charge layer in the mesoporous oxide film.

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Saber, Osama, Hicham Mahfoz Kotb, Mostafa Osama, and Hassan A. Khater. "An Effective Photocatalytic Degradation of Industrial Pollutants through Converting Titanium Oxide to Magnetic Nanotubes and Hollow Nanorods by Kirkendall Effect." Nanomaterials 12, no. 3 (January 27, 2022): 440. http://dx.doi.org/10.3390/nano12030440.

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Controlling of morphology from nanoparticles to magnetic nanotubes and hollow nanorods are interesting for developing the photo-active materials and their applications in the field of photocatalysis and decontamination of aquatic effluents. In the current study, titanium dioxide nanoparticles and nanocomposites were prepared by different techniques to produce various morphologies. The nanoparticles of pure titanium dioxide were prepared by sol-gel technique. Magnetic nanotubes and hollow nanorods were prepared by combining titanium with di- and tri-valent iron through two stages: urea hydrolysis and solvent thermal technique. According to the Kirkendall effect, magnetic nanotubes were fabricated by unequal diffusion of Fe2+, Fe3+ and Ti4+ inside the nanocomposite to produce maghemite-titanian phase. In the same trend, hollow nanorods were synthesized by limited diffusion of both trivalent iron and tetravalent titanium producing amorphous structure of titanium iron oxides. The magnetic and optical properties showed that these nanotubes and hollow nanorods are magnetically active and optically more effective compared with titanium dioxide nanoparticles. Therefore, the Naphthol green B dye completely disappeared after 45 min of UV light irradiation in presence of the hollow nanorods. The kinetic study confirmed the high performance of the hollow nanorods for the photocatalytic degradation of Naphthol green B compared with titanium dioxide nanoparticles.

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Mohaimeed, Ameen alwan. "The Study the Influence of TiO2-Nanoparticles Doped in Polyvinyl Alcohol by Measuring Optical Properties of PVA Films." Iraqi Journal of Nanotechnology, no. 3 (October 14, 2022): 59–70. http://dx.doi.org/10.47758/ijn.vi3.62.

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It was investigated how titanium dioxide nanoparticles affected the optical properties of polyvinyl alcohol. Polymer nanocomposites (PVA-TiO2) are created via stirring and casting. The results demonstrate that transmittance improves from 75% to 95% while titanium dioxide concentration enhances the absorbance of nanocomposites. Nanocomposite films made of PVA and TiO2 had reflectance values of 12 and 16 percent (weight percent=0.15 and 0.85%).The refractive index and coefficient of extinction rise with increasing density, and optical absorption and photon dispersion in the nanocomposite (PVA-TiO2) also rise as the concentration of titanium dioxide nanoparticles rises. Real dielectric (r) and imaginary dielectric I constants also rise as titanium dioxide nanoparticle concentration does. The results show that when the weight % of (TiO2) nanoparticles increased, the energy gap decreased from 3.32 to 2.23. Additionally, optical conductivity increased with the concentration of (TiO2) NPs. Nanocomposites of PVA and TiO2 are essential for optical applications.

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Sharma, Mamta, and S. S. Tomar. "Synthesis and Antimicrobial Activity of Azobenzene Based Titania Nanoparticles Coated Cotton Fibers." Asian Journal of Organic & Medicinal Chemistry 4, no. 2 (2019): 51–54. http://dx.doi.org/10.14233/ajomc.2019.ajomc-p144.

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In this paper, we report the synthesis of a highly photocatalytic titanium dioxide nanoparticles bondedwith azobenzene and cotton by simple sol-gel method. The synthesized azobenzene based titania nanoparticles coated cotton fibers were characterized using UV-visible and SEM and reported their antimicrobial activity. It was observed that the presence of titanium dioxide bonded with azobenzene effectively prevents both the cotton fibers from getting contaminated.

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Rahimi, Sajad, Ali Poormohammadi, Behnam Salmani, Mohammad Ahmadian, and Mina Rezaei. "Comparing the photocatalytic process efficiency using batch and tubular reactors in removal of methylene blue dye and COD from simulated textile wastewater." Journal of Water Reuse and Desalination 6, no. 4 (February 10, 2016): 574–82. http://dx.doi.org/10.2166/wrd.2016.190.

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The aim of this study was photocatalytic degradation of methylene blue (MB) dye using titanium dioxide nanoparticles simulated using ultraviolet in batch and tubular reactors. In this study, the effect of different concentrations of titanium dioxide nanoparticles in the photocatalytic process on MB degradation was examined in batch and tubular reactors. The effect of dye concentration, titanium dioxide nanoparticle concentration and aeration level were examined on the process efficiency. Results showed that the removal of MB dye was directly related to the radiation time. The best removal efficiency of dye and chemical oxygen demand (COD) in the batch reactor was 100% and 42.2%, respectively, while it was 93% and 47.8% in the tubular reactor (in 1.2 g/L of titanium dioxide nanoparticles at 60 min). Moreover, as dye concentration increased, dye removal rate decreased. Making use of the batch model to remove dye and COD is more efficient and can be used on a larger scale due to the required removal efficiency and wastewater discharge standards.

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Farrash Bamoharram, Fatemeh, Afsaneh Moghadam Jafari, Ali Ayati, Bahareh Tanhaei, and Mika Sillanpää. "Cesium Salt of Sodium 30-Tungstopentaphosphate: An Effective and Green Polyoxometalate for Synthesis of Gold Nanoparticles along with Decoration of Titanium Dioxide with Gold Nanoparticles for Bleaching of Malachite Green." International Journal of Photoenergy 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/507329.

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For the first time, capability of the cesium salt of sodium 30-tungstopentaphosphate, the so-called Preyssler’s anion (CsP5), as a green and eco-friendly polyoxometalate was investigated in the synthesis of gold nanoparticles and decoration of titanium dioxide with gold nanoparticles. Gold nanoparticles and nanocomposites were characterized by TEM, XRD, UV, and FTIR. TEM images showed that the gold nanoparticles have tubular and spherical shapes and particle size ranges from 10 to 25 nm. For gold-decorated titanium dioxide/Preyssler, a comparison between pure and amine-modified titanium dioxide showed higher loading of gold nanoparticles on amine-functionalized titanium dioxide. The performance of CsP5was compared with its pure acid (HP5). Our findings showed that CsP5, as a catalytic linker to bind onto titanium dioxide surface for reducing gold nanoparticles, renders decoration better than HP5in both pure and modified titanium dioxide. In addition, efficiency of the photocatalytic bleaching of malachite green by the synthesized nanocomposites was found to be excellent.

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El-Bediwi, Abu Bakr, N. A. El-Shishtawi, and Manal Mawloud Abdullah. "Influence of Titanium Dioxide Nanoparticles on Microstructure, Electrochemical Corrosion Behavior, Mechanical and Thermal Properties of Sn-Al-Bi Based Alloy." International Journal of Applied Sciences and Biotechnology 4, no. 3 (September 26, 2016): 417–24. http://dx.doi.org/10.3126/ijasbt.v4i3.15781.

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Effect of adding titanium dioxide nanoparticles on microstructure, Vickers hardness, internal friction, thermal parameters and electrochemical corrosion behavior of Sn76Al10Bi10Cu2Zn2alloy has been studied using different experimental techniques. Crystallinity (peak intensity), crystal size (peak broadness) and orientations (peak position, 2θ) of Sn76Al10Bi10Cu2Zn2alloy changed after adding titanium dioxide nanoparticles. Corrosion resistance and internal friction of Sn76Al10Bi10Cu2Zn2 alloy improved after adding titanium dioxide nanoparticles. Vickers hardness value of Sn76Al10Bi10Cu2Zn2 alloy varied decreased after adding titanium dioxide nanoparticles. Int J Appl Sci Biotechnol, Vol 4(3): 417-424

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Lastra, Ruben O., Tatjana Paunesku, Barite Gutama, Filiberto Reyes, Josie François, Shelby Martinez, Lun Xin, et al. "Protein Binding Effects of Dopamine Coated Titanium Dioxide Shell Nanoparticles." Precision Nanomedicine 2, no. 4 (October 2, 2019): 393–438. http://dx.doi.org/10.33218/prnano2(4).190802.1.

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Non-targeted nanoparticles are capable of entering cells, passing through different subcellular compartments and accumulating on their surface a protein corona that changes over time. In this study, we used metal oxide nanoparticles with iron-oxide core covered with titanium dioxide shell (Fe3O4@TiO2), with a single layer of covalently bound dopamine covering the nanoparticle surface. Mixing nanoparticles with cellular protein isolates showed that these nanoparticles can form complexes with numerous cellular proteins. The addition of non-toxic quantities of nano-particles to HeLa cell culture resulted in their non-specific uptake and accumulation of protein corona on nanoparticle surface. TfRC, Hsp90 and PARP were followed as representative protein components of nanoparticle corona; each protein bound to nanoparticles with different affinity. The presence of nanoparticles in cells also mildly modulated gene expression on the level of mRNA. In conclusion, cells exposed to non-targeted nanoparticles show subtle but numerous changes that are consistent from one experiment to another.

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Ziental, Daniel, Beata Czarczynska-Goslinska, Dariusz T. Mlynarczyk, Arleta Glowacka-Sobotta, Beata Stanisz, Tomasz Goslinski, and Lukasz Sobotta. "Titanium Dioxide Nanoparticles: Prospects and Applications in Medicine." Nanomaterials 10, no. 2 (February 23, 2020): 387. http://dx.doi.org/10.3390/nano10020387.

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Metallic and metal oxide nanoparticles (NPs), including titanium dioxide NPs, among polymeric NPs, liposomes, micelles, quantum dots, dendrimers, or fullerenes, are becoming more and more important due to their potential use in novel medical therapies. Titanium dioxide (titanium(IV) oxide, titania, TiO2) is an inorganic compound that owes its recent rise in scientific interest to photoactivity. After the illumination in aqueous media with UV light, TiO2 produces an array of reactive oxygen species (ROS). The capability to produce ROS and thus induce cell death has found application in the photodynamic therapy (PDT) for the treatment of a wide range of maladies, from psoriasis to cancer. Titanium dioxide NPs were studied as photosensitizing agents in the treatment of malignant tumors as well as in photodynamic inactivation of antibiotic-resistant bacteria. Both TiO2 NPs themselves, as well as their composites and combinations with other molecules or biomolecules, can be successfully used as photosensitizers in PDT. Moreover, various organic compounds can be grafted on TiO2 nanoparticles, leading to hybrid materials. These nanostructures can reveal increased light absorption, allowing their further use in targeted therapy in medicine. In order to improve efficient anticancer and antimicrobial therapies, many approaches utilizing titanium dioxide were tested. Results of selected studies presenting the scope of potential uses are discussed in this review.

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Teramoto, Yudai, Keita Ando, Satoru Tsukada, and Katsuyoshi Hoshino. "Triboelectric Charging Behaviors of Polyester Films Doped with Titanium Dioxide Nanoparticles of Various Crystal Structures." Applied Sciences 13, no. 3 (January 22, 2023): 1468. http://dx.doi.org/10.3390/app13031468.

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It is empirically known that titanium dioxide nanoparticles stabilize the contact and frictional charge of the host polymers to which they are added. However, the mechanism for the stabilization process has not yet been elucidated. In this study, polyester films doped with titanium dioxide nanoparticles of different crystalline forms were triboelectrically charged and the effect of humidity on their charging characteristics was subsequently investigated to elucidate the charge stabilization mechanism. Our first finding was that the rutile-, rutile–anatase mixed crystal (P25)-, and amorphous-dominant-type titanium dioxide nanoparticles reduced the sensitivity of the films to humidity (humidity dependence), while the anatase-type titanium dioxide enhanced the humidity dependence. This difference in action was explained by associating it with the different water adsorption forms on the major crystalline surface of each titanium dioxide type. The second finding was that doping with titanium dioxide nanoparticles, particularly rutile and P25 nanoparticles, reduced fluctuations in the amount of tribocharges of the polyester film. This crystalline-form-dependent difference in action was considered to be based on the depth of the electron traps involved in each titanium dioxide type. The above two findings have allowed us to propose the first mechanism of tribocharge stabilization by titanium dioxide.

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A. Kandiel, Tarek, Ralf Dillert, and Detlef Bahnemann. "Titanium Dioxide Nanoparticles and Nanostructures." Current Inorganic Chemistrye 2, no. 2 (May 1, 2012): 94–114. http://dx.doi.org/10.2174/1877944111202020094.

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Chen, Tao, Jian Yan, and Yan Li. "Genotoxicity of titanium dioxide nanoparticles." Journal of Food and Drug Analysis 22, no. 1 (March 2014): 95–104. http://dx.doi.org/10.1016/j.jfda.2014.01.008.

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S, Mohanapriya, and Raj V. "Preparation and Characterization of Nano Titania modified PVA-Pectin polymer electrolyte membranes for DMFC." International Journal of Research in Science 4, no. 2 (June 19, 2018): 6. http://dx.doi.org/10.24178/ijrs.2018.4.2.06.

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In this study, poly vinyl alcohol and pectin are in situ cross-linked using dual cross-linker comprising a mixture of sulfosuccinic acid and glutaraldehyde followed by solvent casting.Titanium dioxide nanoparticles are incorporated into polymer solutions that controls alignment and disentanglement of polymer chains at molecular level. It is shown that rational design of membrane microstructure with proper arrangement of hydrophobic and hydrophilic domains has been formulated by blending PVA with PC. Water sorption through nanocomposite membrane enhanced when optimum quantity of titanium dioxide particles are present. In addition, titanium dioxide nanoparticles help to provide more inter-connected proton conducting pathways and acts as reinforcing units. Through the hydrogen bonds formed between surface functional groups of titanium oxide nanoparticles and polymer chains, protons are transferred through the membrane both by hopping and vehicular mechanisms. Titanium dioxide nanoparticles also act as fillers and effectively prevent the methanol permeation. Polymer voids are occupied by the presence of Titanium dioxide nanoparticles that selectively allow protons to pass through form anode to cathode side. Both improved proton conductance and lower methanol permeability, electrochemical selectivity of nano Titanium dioxide modified PVA-Pectin polymer electrolyte membrane is enhanced. With further enriched proton conductivity by the presence of titanium dioxide nanoparticles, fabricated pectin polyvinyl alcohol hybrid nanocomposite membrane exhibit higher electrochemical selective factor.

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C. Vella Durai, S., E. Kumar, and D. Muthuraj. "Investigations on structural, optical, and impedance spectroscopy studies of titanium dioxide nanoparticles." Bulletin of the Chemical Society of Ethiopia 35, no. 1 (May 7, 2021): 151–60. http://dx.doi.org/10.4314/bcse.v35i1.13.

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This article explains a novel synthesis for producing titanium dioxide (TiO2) nanoparticles by a sol-gel technique using titanium tetraisopropoxide as a titanium source. The synthesized nanoparticles were analyzed using many measurements like X-ray diffraction (XRD), HRTEM, absorption UV spectroscopy, FTIR, and ac impedance spectroscopy. X-ray peaks were used to calculate the crystallite size and lattice strain by Williamson–Hall method. Crystallite size calculated from x-ray diffraction using the Scherrer equation gives an approximate size and cannot be used for measurements. TiO2 nanoparticles are found to possess a tetragonal structure with a crystalline size around 12 nm. Particle size was confirmed by HRTEM images. The optical studies response for the nanoparticles showed the possible visible absorption peaks for TiO2 nanoparticles are 323 nm. Bandgap energy (Eg) of the TiO2 nanoparticle calculated from UV visible absorption spectra is discussed, and the bandgap is 3.14 eV. FTIR spectra showed vibration bands of the Ti-O network. AC Conductivity properties of TiO2 nanoparticles are studied in the frequency range 1 to 8 MHz at varying temperatures. The conductivity of the TiO2 nanoparticle is found to be constant in the low angular frequency region. Dielectric parameters were analyzed at different temperatures and frequencies. KEY WORDS: Conductivity, Dielectric, Nanoparticles, Titanium dioxide, Structural studies Bull. Chem. Soc. Ethiop. 2021, 35(1), 151-160. DOI: https://dx.doi.org/10.4314/bcse.v35i1.13

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Pangpaiboon, Nampueng, and Nisanart Traiphol. "Dewetting Suppression of Polystyrene Thin Film Using Titanium Dioxide Nanoparticles." Key Engineering Materials 608 (April 2014): 218–23. http://dx.doi.org/10.4028/www.scientific.net/kem.608.218.

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Effects of titanium dioxide nanoparticles on thermal stability of polymeric thin film are investigated in this study. Polystyrene with molecular weight of 52,000 g/mol is used as a base polymer. The concentrations of titanium dioxide nanoparticles in polystyrene are varied from 0-0.20 wt.%. Films are fabricated by spin casting on Si wafer substrate and annealed at 180 °C and 190 °C for various times in order to study dynamics of dewetting. Film morphologies are analysed by optical microscopy and atomic force microscopy. Dewetting areas of each film as a function of annealing time are determined. It is found that addition of titanium dioxide nanoparticles suppresses dewetting in polystyrene film with thicknesses of ~30 nm and ~100 nm. The same titanium dioxide amounts, on the other hand, accelerate dewetting process in the film with thickness of ~265 nm. Mechanisms of dewetting suppression in polymeric film by titanium dioxide nanoparticles are discussed.

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Shrivastava, A., RK Singh, PK Tyagi, and D. Gore. "Synthesis of Zinc Oxide, Titanium Dioxide and Magnesium Dioxide Nanoparticles and Their Prospective in Pharmaceutical and Biotechnological Applications." Journal of Biomedical Research & Environmental Sciences 2, no. 1 (January 11, 2021): 011–20. http://dx.doi.org/10.37871/jbres1180.

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The use of nanoparticles for the therapeutic purpose is gaining pronounced importance. In the last two decades, a number of nanomedicines received regulatory approval and several showed promises through clinical trials. In this content, it is important to synthesize nanoparticles from various sources and to check its efficiency, especially its antibacterial activity. In today’s scenario number nanomedicines are proving useful to control multidrug resistance and since the mechanism of action of nanoparticles is totally different from the small molecules like antibiotics it obviates the chances of drug resistance. In this review, we discussed three metal-based nanoparticles prepared from various reducing sources namely Zinc Oxide Nanoparticle (ZnO NPs), Titanium Dioxide Nanoparticle (TiO2 NPs) and Magnesium Dioxide Nanoparticle (MnO2 NPs). The focus also made towards the safety assessment of the several nanoparticles. In addition, the exact interaction of the nanoparticles with the bacterial cell surface and the resultant changes also been highlighted. The review put forward the sources, method, and antibacterial success of these nanoparticles so that future nanomedicines could be put forward.

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Duchaniya, R. K., and Niresh Choudhary. "Synthesis and Characterization of PVA/TiO₂ Nanocomposite ." Key Engineering Materials 737 (June 2017): 242–47. http://dx.doi.org/10.4028/www.scientific.net/kem.737.242.

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A thin film of polyvinyl alcohol (PVA) and nanocomposite of PVA/TiO2 have been prepared by spin coating method at room temperature. The influence of titanium dioxide nanoparticles on the structure, optical, and functional group analysis of nanocomposite of polyvinyl alcohol/titanium dioxide was studied by using X-ray diffraction analysis, UV–vis spectroscopy and FTIR (Fourier Transform Infrared Spectroscopy). As some significant amount of titanium dioxide nanoparticles were added to the synthesis process of a thin film of PVA/TiO2 nanocomposite and it was found that electronic band gap of the polyvinyl alcohol decreases from 3.94 eV to 3.04 eV, and absorption wavelength shifted towards red. For titanium dioxide nanoparticles, the calculated value of band gap is 3.24 eV. The XRD peak of the PVA/TiO2 was obtained in between the peak of the titanium dioxide nanoparticles and polyvinyl alcohol. FTIR confirms the presence of bonds Ti-O, -OH , -CH2 , -CH3 and of a carbonyl group.

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A. Abd-Algany, Raad. "Effect of Titanium Dioxide Nanoparticles (TiO2NPs) on Leishmania parasite in vitro." Wasit Journal of Pure sciences 1, no. 1 (July 1, 2022): 78–85. http://dx.doi.org/10.31185/wjps.21.

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The study included detecting the effect of nanoparticles of titanium dioxide nanoparticles (TiO2NPs) with different concentrations (0.5, 1, 5, 10) mg/ml and for two sizes (100, 10) nm on parasites of Leishmania tropica in vitro. The results showed that titanium dioxide nanoparticles (TiO2NPs) have an effect on the parasite with an inverse relationship between growth rate, concentrations of nanoparticles and the exposure period as well as the size of the nanoparticles. The sizes used of titanium dioxide nanoparticles (TiO2NPs) with all their concentrations had a toxic effect on Leishmania promastigote developing in culture media at 48 and 72 hours compared to the control group and that the concentrations of size 10 nm were more effective than concentrations of size of 100 nm on the growth of the parasite during the same time peroids used, and this gives an indication of the importance of using small sizes of titanium dioxide nanoparticles (TiO2NPs) as an anti-growth of Leishmania parasites.

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Machalska, G., M. Noworolnik, M. Szindler, W. Sitek, and R. Babilas. "Titanium dioxide nanoparticles and thin films deposited by an atomization method." Archives of Materials Science and Engineering 1-2, no. 100 (November 1, 2019): 34–41. http://dx.doi.org/10.5604/01.3001.0013.6000.

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Purpose: The article presents the results of research on titanium dioxide synthesized by a sol-gel method that is an easy process enabling the control of the shape and size of particles The purpose of this article is to examine titanium dioxide nanoparticles and thin films deposited by an atomization method. Design/methodology/approach: Titanium dioxide sol was synthesized by using titanium isopropoxide as a precursor. Optical properties were measured by a UV-Vis spectrometer. Structural studies were performed by Raman spectroscopy. Qualitative analysis was performed by the EDS. Surface morphology of nanoparticles and thin films was performed by the SEM technique. Findings: The sol-gel method allows the formation of uniform nanoparticles and thin films of titanium dioxide. The atomization method is a successful method for the deposition of sol to the surface of substrates. Research limitations/implications: The next step in the research will be to investigate the obtained thin films in dye-sensitized solar cells as a semiconductive layer. Practical implications: Unique properties of produced titanium dioxide nanostructural materials have caused the interest in them in such fields as optoelectronics, photovoltaics, medicine and decorative coatings. Originality/value: Titanium dioxide thin films and nanoparticles were synthesized using the sol-gel method and then deposited by the atomization method.

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Fuster, Encarnación, Héctor Candela, Jorge Estévez, Eugenio Vilanova, and Miguel A. Sogorb. "Titanium Dioxide, but Not Zinc Oxide, Nanoparticles Cause Severe Transcriptomic Alterations in T98G Human Glioblastoma Cells." International Journal of Molecular Sciences 22, no. 4 (February 19, 2021): 2084. http://dx.doi.org/10.3390/ijms22042084.

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Titanium dioxide and zinc oxide are two of the most widely used nanomaterials. We assessed the effects of noncytotoxic doses of both nanomaterials on T98G human glioblastoma cells by omic approaches. Surprisingly, no effects on the transcriptome of T98G cells was detected after exposure to 5 µg/mL of zinc oxide nanoparticles during 72 h. Conversely, the transcriptome of the cells exposed to 20 µg/mL of titanium dioxide nanoparticles during 72 h revealed alterations in lots of biological processes and molecular pathways. Alterations to the transcriptome suggests that exposure to titanium dioxide nanoparticles might, potentially, compromise the integrity of the blood brain barrier integrity and cause neuroinflammation. The latter issue was further confirmed phenotypically with a proteomic analysis and by recording the release of interleukin 8. Titanium dioxide also caused autophagy, which was demonstrated through the increase in the expression of the autophagy-related 3 and microtubule associated protein 1 light chain 3 alpha genes. The proteomic analysis revealed that titanium dioxide nanoparticles might have anticancerigen properties by downregulating genes involved in the detoxication of anthracyclines. A risk assessment resulting from titanium dioxide exposure, focusing on the central nervous system as a potential target of toxicity, is necessary.

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Putri, Wulandani Liza, Erwin Siregar, and Haru Setyo Anggani. "ANTIBACTERIAL EFFECT OF TITANIUM DIOXIDE NANOPARTICLES AND CHITOSAN NANOPARTICLES IN ORTHODONTIC ADHESIVE RESIN ON STREPTOCOCCUS MUTANS COLONY." Dentino : Jurnal Kedokteran Gigi 6, no. 1 (May 11, 2021): 111. http://dx.doi.org/10.20527/dentino.v6i1.10651.

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ABSTRACTBack ground:Strepococcus mutans colonization around orthodontic bracket is the common thing that may commence the development of white spot lesion.Objectives: This research is to analyze antibacterial effect of titanium dioxide nanoparticles and chitosan nanoparticles in orthodontic adhesive resin toward Streptococcus mutans colony. Methods: This research was conducted at RSKGM University of Indonesia on August 2019. Thirty extracted premolars were randomly allocated into three groups. Bracket was bonded to each specimen using orthodontic adhesive resin (Transbond XT) that was incorporated with titanium dioxide/chitosan nanoparticles. Each sample was submerged in bacterial suspension and was incubated for 24 hours. Streptococcus mutans colony around orthodontic bracket was counted with Total Plate Count methodandthen analyzed using statistical analysis. Results: There is no difference in Streptococcus mutans colony around orthodontic brackets among three treatment groups. Conclusion: Antibacterial effect of orthodontic adhesive resins incorporated with titanium dioxide nanoparticles did not differ from orthodontic adhesive resins incorporated with or without chitosan nanoparticles. This is depicted from the number of Streptococcus mutans colonies around the orthodontic brackets.Keywords: Chitosan nanoparticles, Orthodontic adhesive resin, Streptococcus mutans, Titanium dioxide nanoparticles

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Lysak, Ilia A., Galina V. Lysak, Tatyana D. Malinovskaya, and Anatoly S. Ruhov. "The Development of Photocatalytic Systems Entitled Titanium Dioxide Nanoparticles Attached to Polypropylene Fibrous Carrier for Freshwater Disinfection." Advanced Materials Research 1040 (September 2014): 183–87. http://dx.doi.org/10.4028/www.scientific.net/amr.1040.183.

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In the current article the use of nanoparticles of titanium dioxide is justified to be an active component of the photocatalytic materials. The relationship between composition, structure and bactericidal properties of titanium dioxide is also established. It is shown that the polypropylene carrier comprising on a surface of at least 2.1 ± 0.3 mg/g of titanium dioxide nanoparticles, where both phases of titanium dioxide such as rutile and anatase are presented, allows the antibacterial treatment of water with high efficiency and it can be used for water purification from microbial contamination.

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Souza, Maryana Antonia Braga Batalha, Adriana de Souza Forster, Mabelle Biancardi Oliveira, and José Adilson de Castro. "Experimental Analysis of Behavior in TiO₂ Nanoparticle Suspension." Materials Science Forum 802 (December 2014): 163–67. http://dx.doi.org/10.4028/www.scientific.net/msf.802.163.

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The deposition of TiO2 nanoparticles in the environment has been systematically investigated; this is due to the use of nanosized titanium dioxide (TiO2) in a variety of consumer products such as sunscreens, cosmetics, paints and surface coatings as well as the environmental decontamination of air, soil and water. It is the generalized use which increases the concern that the nanoparticle TiO2 could pose a risk to ecosystems and humans. In this context, this paper aims to characterize different suspensions of nanoparticles of titanium dioxide. Although these particles are already incorporated in a wide range of products, the evaluation of their behavior and its effects on the environment and health start to grow now. So this paper aims to conduct a study of the behavior of TiO2 nanoparticles in aqueous suspensions. The study encompasses TiO2 solutions with ultra pure water with and without added NaCl, landfill leachate and tap water. The results obtained showed that the addition of NaCl in the solution increases the size of the TiO2 nanoparticles, showing that the sodium chloride functions as a binding agent when in contact with nanoparticles of titanium dioxide.

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Yang, Zhao Dan. "Application of Titanium Dioxide Nanoparticles on Textile Modification." Advanced Materials Research 821-822 (September 2013): 901–5. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.901.

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Titanium dioxide nanoparticles have the unique properties of optic character and can be used in textile region. In this paper, the application status, prepare methods of physical method and chemical method, application method of exhaustion, pad-dry-cure and coating methods in textile modification of titanium dioxide nanoparticles are introduced. The prepared mechanisms are then analysis. It is shown that titanium dioxide nanoparticles can provide ultraviolet-resistance fuction, anti-bacterial activity, infrared effects, anti-static eclectricity function, anti-aging function and Self-cleaning effect in textile modification. As last, the existed problems and tend to development are analysized.

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Safaei, Mohsen, Mojtaba Taran, Mohammad Moslem Imani, Hedaiat Moradpoor, Amin Golshah, and Prabhat Upadhyay. "In vitro evaluation of anticancer activity of sodium hyaluronate-titanium dioxide bionanocomposite." Current Issues in Pharmacy and Medical Sciences 32, no. 2 (June 1, 2019): 99–103. http://dx.doi.org/10.2478/cipms-2019-0019.

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Abstract The purpose of the current research is to optimize the synthesis of sodium hyaluronatetitanium dioxide nanocomposite with the highest anticancer activity. To this end, the Taguchi method was followed to design nine experiments with different ratios of sodium hyaluronate biopolymer, titanium dioxide nanoparticles and stirring times. The results of scanning electron microscopy (SEM) confirmed the synthesis of the nanoparticle and nanocomposite. The comparison of anticancer activity level of synthesized nanocomposites using MTT assay showed that the nanocomposite synthesized in the conditions of experiment 9 (8 mg/ml of titanium dioxide nanoparticles, 2 mg/ml of sodium hyaluronate biopolymer and 60 min stirring time) had the maximum anticancer activity against Michigan Cancer Foundation-7 (MCF-7) cell line. According to the results, the Taguchi method can be employed as an effective and useful strategy to save time and cost in order to determine the optimal conditions for the synthesis of sodium hyaluronate-titanium dioxide nanocomposite with the most favorable anticancer activity.

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Majerič, Peter, Rebeka Rudolf, and Ivan Anžel. "Thermodynamics of nanoparticles." Anali PAZU 4, no. 1 (June 7, 2022): 28–33. http://dx.doi.org/10.18690/analipazu.4.1.28-33.2014.

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This article deals with the basis for thermodynamic calculations of nanoparticles. Thermodynamics on the nanoscale are different than in bulk form, as there are more surface atoms with surface energy, which is different from bulk atom energy. This contribution of surface energy in nanoparticles changes the mechanisms of melting, grain growth, etc. compared to bulk materials. Using this starting point, one can use these calculations as a basis in nanoparticle synthesis processes. In our research we have synthesized nanoparticles with the process known as Ultrasonic Spray Pyrolysis. This is a versatile process, capable of producing nanoparticles from various materials such as gold, silver, titanium dioxide, nickel, nickel titanium, and so on.

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Journal, Baghdad Science. "A Study the Effect of TiO2 Nanoparticles Combination with Antibiotics and Plant extracts Against Some Gram Negative Bacteria." Baghdad Science Journal 13, no. 3 (September 4, 2016): 425–34. http://dx.doi.org/10.21123/bsj.13.3.425-434.

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Titanium dioxide TiO2 has been widely utilized in cleaning and sterilizing material for many clinical tools sanitary ware, food tableware and cooking and items for use in hospitals. Titanium dioxide TiO2 non toxicity and long term physical and chemical stability. It has been widely used decomposition of organic compounds and microbial organisms such as cancer cell, viruses and bacteria as well as its potential application in sterilization of medical devices. The aim of the study the effect of titanium dioxide TiO2 on some Gram negative bacteria and study their effects on some virulence factors and chromosomal DNA.In this study, we obtained (E. coli ? Proteus mirabilis, Proteus vulgaris ? Pseudomonas aeruginosa ? Klebsiella pneumonia and Acinetobacter baumannii) from Al-Emamain Al-Kadhemain Medical City Hospital in Baghdad. Samples collection were carried out from 1 April to 30 June 2014. Study the effect of (plant extraction and Antibiotic) alone and combination with Titanium dioxide TiO2 on bacteria growth. And study the effect of Titanium dioxide TiO2 on biofilm layer and chromosomal DNA.Combinations of TiO2 nanoparticle with water and alcohol extracts of plant (Salvia officinalis ?Arctium minus, Origanum majorana and Anabasis syriaca) gave synergistic results against the gram negative bacterial isolates.A Synergism effect was observed in combination of Ciprofloxacin with Titanium TiO2 nanoparticles toward all Gram negative bacteria. Also a high efficiency was observed when TiO2 nanoparticles mixed with Amikacin toward all isolates except Acinetobacter baumannii and E. coli3. While the results of mixing TiO2 nanoparticles with Cephalothin indicate highly efficiency toward all isolates except Pseudomonas aeruginosa.The combination of plant extracts (Salvia officinalis ? Arctium minus ? Origanum majorana and Anabasis syriaca) with TiO2 nanoparticles was appear to be damaged to E. coli chromosomal DNA.The study showed the ability of nanoparticles TiO2 to inhibition of the layer Biofilm to all isolates of bacteria at concentrations (1, 1.5) µg/ ml.Conclude from this study we can be used TiO2 nanoparticles to kill some types of bacteria

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Smith, Leon, Zdenka Kuncic, Kostya (Ken) Ostrikov, and Shailesh Kumar. "Nanoparticles in Cancer Imaging and Therapy." Journal of Nanomaterials 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/891318.

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Nanoparticle contrast agents offer the potential to significantly improve existing methods of cancer diagnosis and treatment. Advantages include biocompatibility, selective accumulation in tumor cells, and reduced toxicity. Considerable research is underway into the use of nanoparticles as enhancement agents for radiation therapy and photodynamic therapy, where they may be used to deliver treatment agents, produce localized enhancements in radiation dose and selectively target tumor cells for localized damage. This paper reviews the current status of nanoparticles for cancer treatment and presents preliminary results of a pilot study investigating titanium dioxide nanoparticles for dual-mode enhancement of computed tomography (CT) imaging and kilovoltage radiation therapy. Although titanium dioxide produced noticeable image contrast enhancement in the CT scans, more sensitive detectors are needed to determine whether the nanoparticles can also produce localized dose enhancement for targeted radiation therapy.

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Srivastava, Soamyaa, and Jayanand Manjhi. "Facile Characterization of Titanium Dioxide Nano- particles Prepared via Hydrothermal Method with in-situ Surface Modification." International Journal of Pharmaceutical Sciences and Nanotechnology(IJPSN) 15, no. 4 (September 15, 2022): 6034–42. http://dx.doi.org/10.37285/ijpsn.2022.15.4.3.

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Aim: The present study is focused on the synthesis and characterization of titanium dioxide nanoparticles prepared via the hydrothermal method prepared via in-situ surface modification. Purpose of the study: The proposed research is based on the requirement of alternate antimicrobial therapies. The global misuse and overuse of antibiotics have given rise to the antibiotic resistance crisis. The emergence of multi-drug resistant bacteria has failed the conventional treatment methods involving antibiotics. To meet the need for efficient alternate strategies, metal oxide nanoparticles such as titanium dioxide are explored since it's known for their preventing and treating infections. Method: Titanium dioxide nanoparticles were successfully synthesized via hydrothermal and Surface modification of nanoparticles in dehydrated ethanol at room temperature. The obtained nanoparticles are characterized by utilizing Scanning Electron Microscope, Transmission Electron Microscope, Energy Dispersive X-ray Spectroscopy, Zeta Potential Analysis, Thermogravimetric analysis, and Fourier transform Infrared spectroscopy. Results: According to scanning electron microscopy and transmission electron microscopy, the morphological analysis of the synthesized titanium dioxide was spherical shaped and had an average size of 5-20nm and a size distribution of 14-20nm. The Energy Dispersive X-ray spectroscopy analysis depicted the percentage of elements in TiO2 as Ti (47.10%) and O2 (52.90%). The zeta potential for titanium dioxide was reported as -13.39, and the negative value indicated superior physical stability of nanoparticles in a suspension. The Fourier Transform Infrared spectroscopy peak at 1417.68 indicated the O-Ti-O bond in anatase morphology. While Thermogravimetric analysis showed three main stages of mass loss, there was no mass loss after 503°C, which started oxide formation. Conclusion: It was concluded from the present study that the synthesis of titanium dioxide is an economical process and yields excellent nanoparticles via the hydrothermal method. Characterization of the nanomaterial allowed us to determine the thermal stability, morphology, and purity of titanium dioxide nanoparticles.

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Pankivska, Yu B., L. O. Biliavska, O. Yu Povnitsa, M. M. Zagornyi, A. V. Ragulia, M. S. Kharchuk, and S. D. Zagorodnya. "Antiadenoviral Activity of Titanium Dioxide Nanoparticles." Mikrobiolohichnyi Zhurnal 81, no. 5 (September 30, 2019): 73–84. http://dx.doi.org/10.15407/microbiolj81.05.073.

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Chang, Qing, Man Luo, Cheng Li, Mingguang Hang, Minghong Wu, Zheng Jiao, and Xiaoyong Deng. "Neurotoxicity evaluation of titanium dioxide nanoparticles." Nanomedicine: Nanotechnology, Biology and Medicine 14, no. 5 (July 2018): 1866. http://dx.doi.org/10.1016/j.nano.2017.11.335.

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Egerton, T. A., and I. R. Tooley. "Physical characterization of titanium dioxide nanoparticles." International Journal of Cosmetic Science 36, no. 3 (March 28, 2014): 195–206. http://dx.doi.org/10.1111/ics.12113.

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Behnam, Habibeh, Hassan Feizi, and Masoud Alipanah. "Alleviation the effects of salinity stress using titanium dioxide nano and bulk particles in Echinacea seeds and seedlings." Advances in Horticultural Science 35, no. 4 (October 29, 2021): 351–60. http://dx.doi.org/10.36253/ahsc-10850.

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This study aimed to investigate the effect of nanoparticles and non-nanoparticles of titanium dioxide on germination indices of Echinacea under salinity stress. Experimental treatments included nano and bulk particles of titanium dioxide at concentrations of 0, 10, 50, 100 and 150 mg/l and salinity stress from NaCl at levels of 0, -3, -6 and -9 bar. The results showed that Echinacea is sensitive to high salinity stress levels (-6 and -9 bar). The use of nano and non-nano titanium dioxide treatment improved some traits under severe salinity stress. The germination percentage did not occur at salinity levels of -6 and -9 bar, but the addition of nano titanium dioxide with a concentration of 150 mg/l and 50 mg/l non-nano increased germination by 50.6%. Application of nano titanium dioxide increased the seedling weight in control by 1.28 mg to 4.26 mg in the treatment of 150 mg/l nanoparticles. The application of nano and bulk titanium dioxide could significantly reduce the negative effect of high salinity stress levels. This can be a valuable and hopeful solution to solve the problem of salinity stress in Echinacea.

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Maciejewska, Julia, Magdalena Oćwieja, Zbigniew Adamczyk, Elżbieta Bielańska, and Bogna Napruszewska. "Titanium dioxide/silver nanoparticle bilayers prepared in self-assembly processes." Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia 71, no. 1 (May 24, 2016): 29. http://dx.doi.org/10.17951/aa.2016.71.1.29.

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A new method for the preparation of TiO2/Ag bilayers via colloid self-assembly process using well-characterized titanium dioxide and silver suspensions was developed. The titanium dioxide nanoparticles, forming a supporting layer, were 46 nm in diameter, exhibiting an isoelectric point at pH 6.4. The silver nanoparticles, forming an external layer of the diameter of 50 nm were prepared via a chemical reduction method with the presence inorganic phosphate salts. The electrophoretic mobility measurements revealed that the zeta potential of silver nanoparticles was highly negative for a broad range of pH and ionic strengths. By explaining this information, the optimum condition for the silver nanoparticle immobilization on TiO2 supporting layers were selected. The coverage of the first layer was adjusted by ionic strength of the suspensions and by the deposition time. Afterward, the silver nanoparticle monolayers of controlled coverage were deposited under the diffusion-controlled transport. Their coverage was determined by a direct enumeration of deposited nanoparticles from AFM images and SEM micrographs. The experimental results showed that for extended deposition times, the coverage of silver nanoparticle layers significantly increases with ionic strength. Therefore, it was proven that the formation of bilayers is mainly controlled by electrostatic interactions and that it is feasible to produce uniform TiO2/Ag materials of desired coverage and structure.

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Yang, Chun-Chen, Chong-Xuan Wang, Che-Yung Kuan, Chih-Ying Chi, Ching-Yun Chen, Yu-Ying Lin, Gin-Shin Chen, Chun-Han Hou, and Feng-Huei Lin. "Using C-doped TiO2 Nanoparticles as a Novel Sonosensitizer for Cancer Treatment." Antioxidants 9, no. 9 (September 17, 2020): 880. http://dx.doi.org/10.3390/antiox9090880.

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Sonodynamic therapy is an effective treatment for eliminating tumor cells by irradiating sonosentitizer in a patient’s body with higher penetration ultrasound and inducing the free radicals. Titanium dioxide has attracted the most attention due to its properties among many nanosensitizers. Hence, in this study, carbon doped titanium dioxide, one of inorganic materials, is applied to avoid the foregoing, and furthermore, carbon doped titanium dioxide is used to generate ROS under ultrasound irradiation to eliminate tumor cells. Spherical carbon doped titanium dioxide nanoparticles are synthesized by the sol-gel process. The forming of C-Ti-O bond may also induce defects in lattice which would be beneficial for the phenomenon of sonoluminescence to improve the effectiveness of sonodynamic therapy. By dint of DCFDA, WST-1, LDH and the Live/Dead test, carbon doped titanium dioxide nanoparticles are shown to be a biocompatible material which may induce ROS radicals to suppress the proliferation of 4T1 breast cancer cells under ultrasound treatment. From in vivo study, carbon doped titanium dioxide nanoparticles activated by ultrasound may inhibit the growth of the 4T1 tumor, and it showed a significant difference between sonodynamic therapy (SDT) and the other groups on the seventh day of the treatment.

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Renitta, R. E., T. J. Jebaseeli, A. Dhanaraj, and S. Paul. "Biological synthesis and characterization of titanium dioxide nanoparticle from Cynodon dactylon." Journal of Achievements in Materials and Manufacturing Engineering 113, no. 1 (July 1, 2022): 31–41. http://dx.doi.org/10.5604/01.3001.0016.0952.

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There are several advantages of using a biological technique to produce nanoparticles versus a chemical method. The primary goal of this work is to characterize and biologically synthesize titanium dioxide (TiO2) nanoparticles from Cynodon dactylon. The characterization has experimented with UV-Vis Spectroscopy, EDX analysis, SEM, XRD, and FTIR. The suggested study uses a simple biological technique to accomplish the systematic biological synthesis of TiO2 nanoparticles utilizing Cynodon dactylon plant extract and titanium tetra isopropoxide as a precursor. UV-Vis spectroscopy, Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-Ray Diffraction (XRD) are used to confirm the fabrication of the TiO2 nanoparticles. The plant extract as well as titanium-based nanoparticles of the herb, Cynodon dactylon will be tested for its antibacterial activity against human pathogens. This eco-friendly technique for nanoparticle synthesis is straightforward and adaptable to major commercial manufacturing and technological applications. Cynodon dactylon biosynthesis of TiO2 nanoparticles is efficient, nutrition dependent, does not employ hazardous compounds, and happens at neutral pH levels. The antibacterial study results show that TiO2 nanoparticles synthesized using Cynodon dactylon have good antibacterial properties. TiO2 nanoparticle method of action against bacteria is unknown. This is an alternative process for synthesising TiO2 nanoparticles, apart from other chemical protocols, since this is quick and non-toxic. The antimicrobial property of biologically synthesized TiO2 nanoparticles against Escherichia coli, Staphylococcus aureus, and Acinetobacter baumannii was tested at four different doses of 15 µl/mg, 25 µl/mg, 50 µl/mg, and 75 µl/mg. The present results revealed the 75 µl/mg concentration got the highest zone of inhibition (15, 13, 15 mm) for Acinetobacter baumannii, Staphylococcus aureus, and Escherichia coli. Many nanoparticles smaller than 100 nm are firmly agglomerated with each other in the study. TiO2 nanoparticles absorb in the UV region of 200 to 400 nm. XRD measurements confirmed the presence of TiO2 nanoparticles in the biologically produced sample. In our work, EDX was used to confirm the existence of Ti after its synthesis by Cynodon dactylon. The biosynthesized TiO2 nanoparticles utilizing Cynodon dactylon plant extracts exhibit a good potent antibacterial activity. The proposed results showed that the TiO2 nanoparticles are well suited for biomedical applications. The suggested research identifies several eco-friendly, biological, and cost-effective procedures for manufacturing nano-coated herbal products. The agar well diffusion technique was used to assess antibacterial activities toward test pathogens such as Acinetobacter baumannii, Staphylococcus aureus, and Escherichia coli.

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Inquil Ayquipa, Lenin, and Jhonny Valverde Flores. "Adsorption of lead and iron present in the waters of the Santa River using titanium dioxide nanoparticles (TiO2) [Adsorción de plomo y hierro presentes en aguas del río Santa utilizando nanopartículas de dióxido de titanio (TiO2)]." Journal of Nanotechnology 4, no. 2 (December 26, 2020): 8. http://dx.doi.org/10.32829/nanoj.v4i2.199.

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The objective of the investigation was to determine adsorption of lead and iron in waters coming from the Santa River, Recuay jurisdiction, Ancash. Then the synthesis of titanium dioxide nanoparticles (TiO2) was carried out by means of ultrasound, and finally the adsorption of the metal ions present in these waters by means of the titanium dioxide nanoparticles. The results indicate that the iron was adsorbed by 92.69% (from 31.86 mg/L to 2.33 mg/L) and the lead was adsorbed by 79.58% (from 2.361 mg/L to 0.482 mg/L) using 600mg of titanium dioxide nanoparticles (TiO2) and a treatment time of 60 minutes of treatment.

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AKBAR, L., K. ALI, M. SAJJAD, A. SATTAR, B. SALEEM, U. AMJAD, A. RIZWAN, et al. "ENHANCEMENT IN OPTICAL PROPERTIES OF COBALT DOPED TiO2 NANOPARTICLES." Digest Journal of Nanomaterials and Biostructures 15, no. 2 (April 2020): 329–35. http://dx.doi.org/10.15251/djnb.2020.152.329.

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Cobalt doped titanium dioxide has consumed great consideration because of their photo catalytic activity and numerous utilizations in paints, white pigments and tooth paste. The co-precipitation technique was utilized in this present study to produce titanium dioxide nanoparticles using (TTIP) titanium tetra iso-propoxide and cobalt nitrate as a starting precursor. Cobalt doped TiO2nanoparticles were synthesized up to four to seven percent of cobalt composition. The Morphology of nanoparticles, crystal structure and optical characteristics were analyzed by XRD, UV-vis spectroscopy and scanning electron microscopy, respectively. Functional groups of cobalt doped TiO2 nanoparticles were confirmed by Fourier transform infrared spectroscopy (FTIR). The modified cobalt-doped titanium dioxide exhibits increased absorption in UV region as increasing cobalt content. The main purpose of this research is to enhance the photo catalytic activity and observe the dimensions, morphology and cobalt concentration as well as shape of prepared nanoparticles.

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Sadovskaya, Lyubov’ Yu, Tatsiana V. Sviridova, Mariya V. Morozova, and Dmitriy V. Sviridov. "Synthesis of nanodispersed titanium dioxide via pH-controlled polymerization of titanium acid." Journal of the Belarusian State University. Chemistry, no. 1 (February 21, 2019): 32–37. http://dx.doi.org/10.33581/2520-257x-2019-1-32-37.

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The possibility of synthesis of highly photoactive nanosized titania employing ion exchange to exert control over polycondensation of titanium acid in aqueous medium has been demonstrated. The resultant spherical TiO2 nanoparticles exhibits extra high light-induced oxidation activity remaining for some time even after termination of UV illumination. The nanodispersed titania readily penetrate into the surface pores and can be used for deposition of photocatalytic coatings by impregnation technique.

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REZENDE, Karina Fernandes Oliveira, Elisa BERGAMI, Kelison Venício Brito ALVES, Ilaria CORSI, and Edison BARBIERI. "Titanium dioxide nanoparticles alters routine metabolism and causes histopathological alterations in Oreochromis niloticus." Boletim do Instituto de Pesca 44, no. 2 (April 5, 2018): 343. http://dx.doi.org/10.20950/1678-2305.2018.343.

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Heilman, S., and L. G. A. Silva. "Silver and Titanium Nanoparticles Used as Coating on Polyurethane Catheters." Journal of Nano Research 47 (May 2017): 17–23. http://dx.doi.org/10.4028/www.scientific.net/jnanor.47.17.

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Silver nanoparticles have been used in the medical area due to their remarkable antimicrobial properties. In this sense titanium dioxide nanoparticles obtained by the sol-gel method were used as coating of catheters for subsequent impregnation of silver nanoparticles with gamma irradiation and electron beam at 25 and 50 kGy. This work aimed to study the use of the silver nanoparticles and titanium dioxide as coating of polyurethane Central Venous Catheter (CVC) for antimicrobial activity. Furthermore the amounts of titanium and silver present in the coated catheters had been evaluated by Inductively Coupled Plasma – Optical Emission Spectrometry (ICP OES). Therefore the Raman spectrometry was used to identify the polymorph of titanium oxide, rutile.

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FEIZI, Hassan, Nafiseh AGHELI, and Hossein SAHABI. "Titanium dioxide nanoparticles alleviate cadmium toxicity in lentil (Lens culinaris Medic) seeds." Acta agriculturae Slovenica 116, no. 1 (September 25, 2020): 59. http://dx.doi.org/10.14720/aas.2020.116.1.1116.

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This research was carried out with the aim of investigating the effects of different concentrations of titanium dioxide nanoparticles and cadmium on lentil seed germination and seedling early growth. The experiment was conducted as a factorial layout based on a completely randomized design with four replicates. Test plants were exposed to 0, 100, 250, and 500 ppm of cadmium, and then amended with 0, 100, 200, and 300 ppm of TiO2 nanoparticles. Results demonstrated that the application of 300 ppm of titanium dioxide nanoparticles improved the mean germination time (MGT) and seed germination rate by 39 % and 62 % respectively. Most traits exhibited a decreasing trend as the concentration of cadmium increased. Furthermore, application of 500 ppm of cadmium concentration increased mean germination time compared to the control group (1.667 day). In conclusion, the application of titanium dioxide nanoparticles averted the effect of high cadmium stress on lentils, and maintained the length of the shoot compared to the control. However, further studies on plant life cycles should be performed to detect the inhibitory effects of titanium dioxide on heavy metal toxicity.

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Pasquale, S., G. Politi, L. Pronti, M. Romani, G. Viviani, M. Cestelli Guidi, M. Angelucci, and A. M. Gueli. "Analysis of the distribution of titanium oxide nanoparticles on paintings." Journal of Physics: Conference Series 2204, no. 1 (April 1, 2022): 012070. http://dx.doi.org/10.1088/1742-6596/2204/1/012070.

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Abstract This work is addressed to analyse the distribution of titanium dioxide nanoparticles on painting crossing data coming from two methodologies. Scanning Electron Microscope and Proton Induced X-Ray emission techniques have been employed in the study of the interaction between a colloidal dispersion constituted by titanium dioxide nanoparticles and the painting surface. The former e was used to understand and morphology of the painting and to investigate the distribution of the nanoparticles on the entire cross section of the pictorial layers. Proton induced X-ray emission is aimed at examining the surface titanium distribution by mapping. This study is important because the exploitation of the photocatalytic activity of the titanium dioxide is possible only in the case of absorption of proper energy that can promote the oxide reduction reactions and thus the dirt and dust degradation.

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Abbas et al., Nada. "Histological and Biochemical Parameters Follow-up in Experimental rats Administrated dexamethasone and Treated with Green Synthesis Titanium Dioxide Nanoparticles Using (Camillia sciences) Extracts." Baghdad Science Journal 17, no. 2(SI) (June 22, 2020): 0663. http://dx.doi.org/10.21123/bsj.2020.17.2(si).0663.

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In this study, Titanium Dioxide Nanoparticles were synthesized by an easy and eco-friendly technique (green synthesis) using green tea leaves (Camillia sinensis), Nanoparticles were analyzed using structural and optical analysis, the X-ray pattern showed that Titanium Dioxide NPs had a tetragonal structure with (Face Centered Tetragonal) FCT crystal structure, the UV-visible recorded an absorbance peak near 350 nm and calculated energy band gap was 3.5 eV, all measurements were proved the purity and Nano size of prepared Nanoparticles. Biochemical parameters evaluation also mentioned in this research, these analyzes showed that Titanium Dioxide nanoparticles in particular dose (50 mg/kg) have the ability to reduce blood glucose levels, improve liver functions and recover lipid levels in the animals body, and lastly, histological pancreatic parts were submitted to observe changes that occurred after dexamethasone and nanoparticles were injected.

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Ramimoghadam, Donya, Samira Bagheri, and Sharifah Bee Abd Hamid. "Biotemplated Synthesis of Anatase Titanium Dioxide Nanoparticles via Lignocellulosic Waste Material." BioMed Research International 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/205636.

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Anatase titanium dioxide nanoparticles (TiO2-NPs) were synthesized by sol-gel method using rice straw as a soft biotemplate. Rice straw, as a lignocellulosic waste material, is a biomass feedstock which is globally produced in high rate and could be utilized in an innovative approach to manufacture a value-added product. Rice straw as a reliable biotemplate has been used in the sol-gel method to synthesize ultrasmall sizes of TiO2-NPs with high potential application in photocatalysis. The physicochemical properties of titanium dioxide nanoparticles were investigated by a number of techniques such as X-ray diffraction analysis (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetric analysis (TGA), ultraviolet visible spectra (UV-Vis), and surface area and pore size analysis. All results consensually confirmed that particle sizes of synthesized titanium dioxide were template-dependent, representing decrease in the nanoparticles sizes with increase of biotemplate concentration. Titanium dioxide nanoparticles as small as 13.0 ± 3.3 nm were obtained under our experimental conditions. Additionally, surface area and porosity of synthesized TiO2-NPs have been enhanced by increasing rice straw amount which results in surface modification of nanoparticles and potential application in photocatalysis.

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Fayer, Leonara, Rafaella S. S. Zanette, Juliana T. C. Siqueira, Eduarda R. Oliveira, Camila G. Almeida, Juliana C. Gern, Saulo M. Sousa, Luiz F. C. de Oliveira, Humberto M. Brandão, and Michele Munk. "The distinct effect of titanium dioxide nanoparticles in primary and immortalized cell lines." Toxicology Research 10, no. 3 (May 2021): 511–22. http://dx.doi.org/10.1093/toxres/tfab040.

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Abstract The titanium dioxide nanoparticles (NPs) have been applied to biomedical, pharmaceutical, and food additive fields. However, the effect on health and the environment are conflicting; thus, it has been reviewing several times. In this context, establishing standard robust protocols for detecting cytotoxicity and genotoxicity of nanomaterials became essential for nanotechnology development. The cell type and the intrinsic characteristics of titanium dioxide NPs can influence nanotoxicity. In this work, the cyto- and genotoxicity effects of standard reference material titanium dioxide NPs in primary bovine fibroblasts and immortalized Chinese hamster ovary epithelial (CHO) cells were determined and compared for the first time. Titanium dioxide NPs exposure revealed no cytotoxicity for primary bovine fibroblasts, while only higher concentrations tested (10 μg/ml) induce genotoxic effects in this cell model. In contrast, the lower concentrations of the titanium dioxide NPs cause the cyto- and genotoxic effects in CHO cells. Therefore, our finding indicates that the CHO line was more sensitive toward the effects of titanium dioxide NPs than the primary bovine fibroblast, which should be valuable for their environmental risk assessment.

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Journal articles on the topic 'Titanium dioxide nanoparticles'

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