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Journal articles on the topic 'Concentration of nanoparticle'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Pal, Anuva, and Rajinder Pal. "Rheology of Emulsions Thickened by Starch Nanoparticles." Nanomaterials 12, no. 14 (2022): 2391. http://dx.doi.org/10.3390/nano12142391.

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The rheology of oil-in-water (O/W) emulsions thickened by starch nanoparticles is investigated here. The starch nanoparticle concentration is varied from 0 to 25 wt% based on the matrix aqueous phase. The oil concentration is varied from 0 to 65 wt%. At a given nanoparticle concentration, the emulsions are generally Newtonian at low oil concentrations. The emulsions become shear-thinning at high oil concentrations. The increase in nanoparticle concentration at a given oil concentration increases the consistency of the emulsion and enhances the shear-thinning behavior of emulsion. The rheologic

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Chow, James C. L., and Sama Jubran. "Depth Dose Enhancement in Orthovoltage Nanoparticle-Enhanced Radiotherapy: A Monte Carlo Phantom Study." Micromachines 14, no. 6 (2023): 1230. http://dx.doi.org/10.3390/mi14061230.

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Background: This study was to examine the depth dose enhancement in orthovoltage nanoparticle-enhanced radiotherapy for skin treatment by investigating the impact of various photon beam energies, nanoparticle materials, and nanoparticle concentrations. Methods: A water phantom was utilized, and different nanoparticle materials (gold, platinum, iodine, silver, iron oxide) were added to determine the depth doses through Monte Carlo simulation. The clinical 105 kVp and 220 kVp photon beams were used to compute the depth doses of the phantom at different nanoparticle concentrations (ranging from 3

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Majeed, Noor Sabeeh, Shaymaa Mahdi Salih, Hussam Nadum Abda Lraheemal Ani, Basma Abbas Abdulmajeed, Paul Constantin Albu, and Gheorghe Nechifor. "Study the Effect of SiO2 Nanofluids on Heat Transfer in Double Pipe Heat Exchanger." Revista de Chimie 71, no. 5 (2020): 117–24. http://dx.doi.org/10.37358/rc.20.5.8119.

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In this paper the effect of nanofluid is studied in the double pipe heat exchanger counter current flow, the viscosity of nanofluids are measured at different temperatures and different particle sizes. SiO2 nanoparticles are dispersed at different concentrations (0.2-2) % with different particle sizes of (50-25) nm in base fluid of water. The friction factor and heat transfer coefficient are calculated at different nanoparticle sizes, the results showed that the viscosity was increased as nanoparticle concentration increased. The friction factor is increased as SiO2 nanoparticles concentration

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Baalousha, Mohammed, Mithun Sikder, Ashwini Prasad, Jamie Lead, Ruth Merrifield, and G. Thomas Chandler. "The concentration-dependent behaviour of nanoparticles." Environmental Chemistry 13, no. 1 (2016): 1. http://dx.doi.org/10.1071/en15142.

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Environmental context Studies of manufactured nanoparticles (NPs) in the environment have been performed almost exclusively at high NP concentrations. These data lead to misunderstandings related to NP fate and effects at relevant environmental concentrations, which are expected to be low. A better understanding of the concentration-dependent behaviour of NPs will improve our understanding of their fate and effects under environmentally realistic conditions. Abstract This rapid communication highlights the importance of nanoparticle concentration in determining their environmental fate and beh

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Srivastava, Rajnandini, and R. C. Mishra. "Impact of CuO nanoparticles on Dunaliella spp. BDUG10113 Growth, Photosynthesis, and Cellular Processes." Biosciences Biotechnology Research Asia 21, no. 2 (2024): 779–88. http://dx.doi.org/10.13005/bbra/3264.

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ABSTRACT: This study investigates the impact of Copper Oxide (CuO) nanoparticles on Dunaliella sp., assessing relative growth rate (RGR), growth rate coefficient (K), and physiological parameters. Increasing CuO nanoparticle concentrations led to a decline in RGR, reflecting negative growth effects, but the lowest concentration (25µl) exhibited the highest RGR and K values. Pigment estimation revealed decreasing chlorophyll a, chlorophyll b, and carotenoid concentrations, indicating disrupted photosynthetic activity. Protein concentration decreased with increasing CuO nanoparticle treatment, s

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Beddoes, Charlotte M., Johanna Berge, Julia E. Bartenstein, et al. "Hydrophilic nanoparticles stabilising mesophase curvature at low concentration but disrupting mesophase order at higher concentrations." Soft Matter 12, no. 28 (2016): 6049–57. http://dx.doi.org/10.1039/c6sm00393a.

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Mirzaev, Sirojiddin, Azam Payzullaev, Muborak Gafurova, Shavkat Nurmatov, and Bakhtiyor Allaev. "EFFECT OF SILICA NANOPARTICLES ON WATER EVAPORATION PROCESS." Journal of Chemical Technology and Metallurgy 60, no. 4 (2025): 625–30. https://doi.org/10.59957/jctm.v60.i4.2025.10.

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This manuscript details an experimental study investigating the surface evaporation characteristics of a nanofluid composed of water and SiO2 nanoparticles with an average diameter of 16 nm. The study evaluated the evaporation rates of nanofluids with varying nanoparticle mass concentrations (0.05 %, 0.1 %, 0.2 %, 0.3 %, 0.4 %, 0.5 %, 1 %, 3%, 5 %) using a STA PT1600 thermal analyser at a temperature of 40°C. Results indicate that SiO2 nanoparticles initially reduce the evaporation rate of water up to a concentration of 0.1 mass %, but this effect reverses, with the evaporation rate increasing

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Bhattacharjee, Baibaswata, Nilanjana Chatterjee, and Chung-Hsin Lu. "Harmful Impact of ZnS Nanoparticles on Daphnia sp. in the Western Part (Districts of Bankura and Purulia) of West Bengal, India." ISRN Nanomaterials 2013 (September 16, 2013): 1–7. http://dx.doi.org/10.1155/2013/207239.

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ZnS nanoparticles of different sizes are synthesized employing a simple wet chemical method. These nanoparticles are used to study their impact on the Daphnia sp. through traditional toxicity tests. The percentage of mortality is found to increase initially with increasing nanoparticle concentration or exposure time and is finally found to saturate for higher concentrations or exposure times. Mortality is found to be higher for smaller particles. Hopping frequency and heart rate are also found to increase with increasing nanoparticle exposure time for a fixed nanoparticle concentration. These

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Nazarpoor, Mahmood, and Hassan Fattahi. "Investigating TE effects on the relationship between signal intensity and PVP-grafted SPION concentration in T2-weighted Spin Echo imaging." Medical Journal of Tabriz University of Medical Sciences 46, no. 2 (2024): 199–209. http://dx.doi.org/10.34172/mj.2024.026.

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Background. Because ionizing radiation and radioactive materials are not used in MRI images and their good spatial resolution, it has been widely used in the diagnosis of diseases. But for a more accurate diagnosis of some diseases, it is necessary to inject contrast material. Contrast materials are metal ions of paramagnetic elements such as gadolinium (Gd) or superparamagnetic iron oxide nanoparticles (SPIONs). This study aims to investigate the effect of echo time (TE) on the signal intensity of PVP-grafted iron oxide nanoparticles on spin echo T2-weighted images as a negative contrast mate

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Skountzos, Emmanuel N., Katerina S. Karadima, and Vlasis G. Mavrantzas. "Structure and Dynamics of Highly Attractive Polymer Nanocomposites in the Semi-Dilute Regime: The Role of Interfacial Domains and Bridging Chains." Polymers 13, no. 16 (2021): 2749. http://dx.doi.org/10.3390/polym13162749.

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Detailed molecular dynamics (MD) simulations are employed to study how the presence of adsorbed domains and nanoparticle bridging chains affect the structural, conformational, thermodynamic, and dynamic properties of attractive polymer nanocomposite melts in the semi-dilute regime. As a model system we have chosen an unentangled poly(ethylene glycol) (PEG) matrix containing amorphous spherical silica nanoparticles with different diameters and at different concentrations. Emphasis is placed on properties such as the polymer mass density profile around nanoparticles, the compressibility of the s

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Jiang, Xu, Ming Liu, Xingxun Li, Li Wang, Shuang Liang, and Xuqiang Guo. "Effects of Surfactant and Hydrophobic Nanoparticles on the Crude Oil-Water Interfacial Tension." Energies 14, no. 19 (2021): 6234. http://dx.doi.org/10.3390/en14196234.

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Surfactants and nanoparticles play crucial roles in controlling the oil-water interfacial phenomenon. The natural oil-wet mineral nanoparticles that exist in crude oil could remarkably affect water-oil interfacial characteristics. Most of recent studies focus on the effect of hydrophilic nanoparticles dispersed in water on the oil-water interfacial phenomenon for the nanoparticle enhanced oil recovery. However, studies of the impact of the oil-wet nanoparticles existed in crude oil on interfacial behaviour are rare. In this study, the impacts of Span 80 surfactant and hydrophobic SiO2 nanopart

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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 (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 forme

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Zhang, Tiantian, Michael J. Murphy, Haiyang Yu, et al. "Investigation of Nanoparticle Adsorption During Transport in Porous Media." SPE Journal 20, no. 04 (2015): 667–77. http://dx.doi.org/10.2118/166346-pa.

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Summary Nanoparticles (diameter of approximately 5 to 50 nm) easily pass through typical pore throats in reservoirs, but physicochemical attraction between nanoparticles and pore walls may still lead to significant retention. We conducted an extensive series of nanoparticle-transport experiments in core plugs and in columns packed with crushed sedimentary rock, systematically varying flow rate, type of nanoparticle, injection-dispersion concentration, and porous-medium properties. Effluent-nanoparticle-concentration histories were measured with fine resolution in time, enabling the evaluation

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Gagliardi, Frank M., Rick D. Franich, and Moshi Geso. "Nanoparticle dose enhancement of synchrotron radiation in PRESAGE dosimeters." Journal of Synchrotron Radiation 27, no. 6 (2020): 1590–600. http://dx.doi.org/10.1107/s1600577520012849.

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The physical absorbed dose enhancement by the inclusion of gold and bismuth nanoparticles fabricated into water-equivalent PRESAGE dosimeters was investigated. Nanoparticle-loaded water-equivalent PRESAGE dosimeters were irradiated with superficial, synchrotron and megavoltage X-ray beams. The change in optical density of the dosimeters was measured using UV–Vis spectrophotometry pre- and post-irradiation using a wavelength of 630 nm. Dose enhancement was measured for 5 nm and 50 nm monodispersed gold nanoparticles, 5–50 nm polydispersed bismuth nanoparticles, and 80 nm monodispersed bismuth n

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Mohd, T. A. T., M. A. A. Shukor, Nurul Aimi Ghazali, et al. "Relationship between Foamability and Nanoparticle Concentration of Carbon Dioxide (CO₂) Foam for Enhanced Oil Recovery (EOR)." Applied Mechanics and Materials 548-549 (April 2014): 67–71. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.67.

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Foam stability can be uttered in foamability measurement and bubble size dispersal. The higher the foamability, the more stable it is. The addition of nanosilica particle to the foam system will further improve the rigidity of the lamellae interface by providing stickiness force between foam lamellae and its surface, halting the film thinning and prevent it from rupture. This paper aims to investigate the stability of CO2 foam with addition of nanoparticle, to find the optimum surfactant and nanoparticle concentration that achieved higher foam stability, to determine the relationship between t

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U.D. Das, Md Abu Mowazzem Hossain, J.U. Ahamed, and M.E.A. Razzaq. "Heat Transfer and Exergy Analysis of a Shell and Tube Heat Exchanger using PGW based ZnO Nanofluids." International Journal of Automotive and Mechanical Engineering 19, no. 2 (2022): 9773–89. http://dx.doi.org/10.15282/ijame.19.2.2022.12.0754.

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In this experimental work, ZnO nanoparticles were synthesized using the chemical precipitation method, and the nanoparticle structure and morphology were characterized through XRD and SEM. Heat transfer and exergetic characteristics were then studied in a shell and tube heat exchanger using PGW-based ZnO nanofluids varying nanoparticle volume concentration and nanofluid (shell side) flow rate at 6, 8, 10 and 12 litres/min. The hot water flow rate was fixed at 12 litres/min. The experimental results show that the heat transfer rate was improved by increasing the nanoparticle concentration and n

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Foster, Shelby L., Katie Estoque, Michael Voecks, Nikki Rentz, and Lauren F. Greenlee. "Removal of Synthetic Azo Dye Using Bimetallic Nickel-Iron Nanoparticles." Journal of Nanomaterials 2019 (March 19, 2019): 1–12. http://dx.doi.org/10.1155/2019/9807605.

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Bimetallic nanoparticles comprised of iron (Fe) and nickel (Ni) were investigated for the removal of an azo dye contaminant in water. Morphology (core shell and alloy) and metal molar ratio (Ni2Fe10, Ni5Fe10, and Ni10Fe10) were tested as key nanoparticle properties. The shelf life of the nanoparticles was tested over a 3-week period, and the effect of initial nanoparticle concentration on dye removal was evaluated. The highest initial nanoparticle concentration (1000 mg/L) showed consistent Orange G removal and the greatest extent of dye removal, as compared to the other tested concentrations

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Latumakulita, Ivandra Immanuela, and Suparno Suparno. "Characterization of Silver Nanoparticle Electrolysis Method with UV-Vis Spectrometer, Atomic Absorption Spectrophotometer, and Particle Size Analyzer." Kasuari: Physics Education Journal (KPEJ) 5, no. 1 (2022): 42–52. http://dx.doi.org/10.37891/kpej.v5i1.178.

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This work reports the production and characteristics of silver nanoparticles by electrolysis method at different voltages and electrolysis time with respect to their soluble concentration. This research is an experimental research. The research sample was the result of a solution of silver nanoparticles by the electrolysis method. The purpose of this research was to determine the effect of electrolysis voltage on the concentration of silver nanoparticles, the effect of electrolysis time on the concentration of silver nanoparticles, and characterization using UV-Vis, AAS and PSA. In this resear

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Kokina, Inese, Ēriks Sļedevskis, Vjačeslavs Gerbreders, et al. "Reaction of Flax (Linum Usitatissimum L.) Calli Culture to Supplement of Medium by Carbon Nanoparticles." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences 66, no. 4-5 (2012): 200–209. http://dx.doi.org/10.2478/v10046-012-0010-3.

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Frequency of callusogenesis, type and capacity of regeneration, cell ploidy, DNA methylation level, histological features, autofluorescence and photobleaching effects were studied in flax calli grown on medium supplemented with different concentrations of carbon (C) nanoparticles. The presence of carbon nanoparticles on medium decreased the percentage calli formation. Detailed histological study led to better understanding of changes in calli caused by nanoparticles. Ploidy variation in calli cells significantly depended on carbon nanoparticle concentration in the medium. Different types of ca

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Calcaterra, Hannah, Nara Shin, Phillip L. Quirk, and Candace S. J. Tsai. "Low Concentration Analysis of Silver Nanoparticles in Consumer Spray Products." Atmosphere 11, no. 4 (2020): 403. http://dx.doi.org/10.3390/atmos11040403.

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The lack of regulations regarding the manufacture of nanoparticle-containing products has enabled the release of many consumer products into the market with uncorroborated claims. Silver nanoparticles are commonly used in consumer goods, particularly in medical and household products. This study was designed to evaluate the aerosol exposure of silver nanoparticles from two consumer spray products currently on the market that claim to contain silver nanoparticles for antibacterial purposes. The study relies on our current understanding of various sampling and analytical methods to effectively e

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Wang, Cheng, Hong Lin, and Yu Yue Chen. "Study on the Preparation of Steady-State Chitosan Nanoparticle as Silk-Fabric Finishing Agent." Advanced Materials Research 175-176 (January 2011): 745–49. http://dx.doi.org/10.4028/www.scientific.net/amr.175-176.745.

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The chitosan nanoparticles can be prepared by ionotropic gelation method in dispersion system. Chitosan nanoparticle has advantages of both the chitosan and the nano particles, and so it has a wide application in the textile finishing field. In this paper, the effects of the concentration of TPP, Span-80, deposited time and pH value on the diameter distribution of the chitosan nanoparticles are discussed in order to obtain the optimized preparation technics of steady state chitosan nanoparticle. The results show that chitosan nanoparticles are successfully prepared by ionotropic gelation metho

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Khaled, Usama, and Abderrahmane Beroual. "AC Dielectric Strength of Mineral Oil-Based Fe3O4 and Al2O3 Nanofluids." Energies 11, no. 12 (2018): 3505. http://dx.doi.org/10.3390/en11123505.

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This paper deals with an experimental study of the influence of conductive (Fe3O4) and insulating (Al2O3) nanoparticles at various concentrations on the dielectric strength of transformer mineral oil. The method of preparation and characterization of these nanofluids (NFs) through the measurements of zeta potential, the real and imaginary parts of dielectric permittivity as well as the concentration and size of nanoparticles using scanning electron microscope images of nanoparticles powders and energy dispersive x-ray spectroscopy analysis are presented. Experimental findings reveal that these

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Siegel, Jakub, Tatiana Savenkova, Jana Pryjmaková, Petr Slepička, Miroslav Šlouf, and Václav Švorčík. "Surface Texturing of Polyethylene Terephthalate Induced by Excimer Laser in Silver Nanoparticle Colloids." Materials 14, no. 12 (2021): 3263. http://dx.doi.org/10.3390/ma14123263.

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We report on a novel technique of surface texturing of polyethylene terephthalate (PET) foil in the presence of silver nanoparticles (AgNPs). This approach provides a variable surface morphology of PET evenly decorated with AgNPs. Surface texturing occurred in silver nanoparticle colloids of different concentrations under the action of pulse excimer laser. Surface morphology of PET immobilized with AgNPs was observed by AFM and FEGSEM. Atomic concentration of silver was determined by XPS. A presented concentration-controlled procedure of surface texturing of PET in the presence of silver collo

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Luthfiyana, Novi, Putri Wening Ratrinia, Irgii Rhoinahda, Taufik Hidayat, and Diana Mauliana Wati. "The antibacterial effects of chitosan nanoparticles from Scylla sp. on acne-related bacteria: Staphylococcus aureus and Staphylococcus epidermidis." BIO Web of Conferences 136 (2024): 02003. http://dx.doi.org/10.1051/bioconf/202413602003.

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One of the many advantages of chitosan obtained from the shells of mud crabs is that it acts as an antibiotic against acne. This study set out to determine chitosan’s characteristic properties that were taken from Scylla sp shells, the nanoparticle’s dimension, and the optimal chitosan nanoparticle concentration to stop the growth of acne-causing Staphylococcus aureus and Staphylococcus epidermidis. A descriptive approach is used in this research methodology to evaluate the chitosan’s quality and antibacterial efficacy. Chitosan nanoparticles at varying concentrations (0.20%, 0.25%, 0.50%, 1%,

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Stebounova, Larissa V., Natalia I. Gonzalez-Pech, Jae Hong Park, T. Renee Anthony, Vicki H. Grassian, and Thomas M. Peters. "Particle Concentrations in Occupational Settings Measured with a Nanoparticle Respiratory Deposition (NRD) Sampler." Annals of Work Exposures and Health 62, no. 6 (2018): 699–710. http://dx.doi.org/10.1093/annweh/wxy033.

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Abstract There is an increasing need to evaluate concentrations of nanoparticles in occupational settings due to their potential negative health effects. The Nanoparticle Respiratory Deposition (NRD) personal sampler was developed to collect nanoparticles separately from larger particles in the breathing zone of workers, while simultaneously providing a measure of respirable mass concentration. This study compared concentrations measured with the NRD sampler to those measured with a nano Micro Orifice Uniform-Deposit Impactor (nanoMOUDI) and respirable samplers in three workplaces. The NRD sam

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Zhassulan, A., Z. Satbayeva, K. Ormanbekov, A. Shynarbek, and R. Kussainov. "ASSESSMENT OF THE TOXICITY OF NANOCOMPOSITE COATINGS FORMED BY THE MICRO-ARC OXIDATION METHOD." Bulletin of Shakarim University. Technical Sciences, no. 2(18) (July 8, 2025): 443–52. https://doi.org/10.53360/2788-7995-2025-2(18)-55.

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A study of the cytotoxicity of nanocomposite coatings formed by microarc oxidation with the addition of nanoparticles was conducted. To assess the toxicity of the coatings, the in vitro MTT test with the HOS cell line was used. Two types of coatings with different nanoparticle concentrations were studied: 0.5% and 1%. The analysis showed that the coating with a lower nanoparticle concentration met international biocompatibility standards, while an increase in the nanoparticle content to 1% led to a significant increase in cytotoxicity. It was experimentally established that at a high concentra

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Mahmoudi, Sajjad, Arezou Jafari, and Soheila Javadian. "Temperature effect on performance of nanoparticle/surfactant flooding in enhanced heavy oil recovery." Petroleum Science 16, no. 6 (2019): 1387–402. http://dx.doi.org/10.1007/s12182-019-00364-6.

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Abstract Recently, nanoparticles have been used along with surfactants for enhancing oil recovery. Although the recent studies show that oil recovery is enhanced using nanoparticle/surfactant solutions, some effective parameters and mechanisms involved in the oil recovery have not yet been investigated. Therefore, the temperature effect on the stability of nanoparticle/surfactant solutions and ultimate oil recovery has been studied in this work, and the optimal concentrations of both SiO2 nanoparticle and surfactant (sodium dodecyl sulfate) have been determined by the Central Composite Design

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Spinnrock, Andreas, Max Martens, Florian Enders, Klaus Boldt, and Helmut Cölfen. "Controlled Preparation of Nanoparticle Gradient Materials by Diffusion." Nanomaterials 9, no. 7 (2019): 988. http://dx.doi.org/10.3390/nano9070988.

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Nanoparticle gradient materials combine a concentration gradient of nanoparticles with a macroscopic matrix. This way, specific properties of nanoscale matter can be transferred to bulk materials. These materials have great potential for applications in optics, electronics, and sensors. However, it is challenging to monitor the formation of such gradient materials and prepare them in a controlled manner. In this study, we present a novel universal approach for the preparation of this material class using diffusion in an analytical ultracentrifuge. The nanoparticles diffuse into a molten thermo

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Apmann, Kevin, Ryan Fulmer, Alberto Soto, and Saeid Vafaei. "Thermal Conductivity and Viscosity: Review and Optimization of Effects of Nanoparticles." Materials 14, no. 5 (2021): 1291. http://dx.doi.org/10.3390/ma14051291.

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This review was focused on expressing the effects of base liquid, temperature, possible surfactant, concentration and characteristics of nanoparticles including size, shape and material on thermal conductivity and viscosity of nanofluids. An increase in nanoparticle concentration can lead to an increase in thermal conductivity and viscosity and an increase in nanoparticle size, can increase or decrease thermal conductivity, while an increase in nanoparticle size decreases the viscosity of the nanofluid. The addition of surfactants at low concentrations can increase thermal conductivity, but at

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Fuller, Melanie, and Ingo Kӧper. "Polyelectrolyte-Coated Gold Nanoparticles: The Effect of Salt and Polyelectrolyte Concentration on Colloidal Stability." Polymers 10, no. 12 (2018): 1336. http://dx.doi.org/10.3390/polym10121336.

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Gold nanoparticles are widely used in biomedical applications. Their ease of surface modification, biocompatibility and the presence of surface plasmons makes them ideal tools for a variety of investigations. Polyelectrolyte-coated gold nanoparticles are employed in areas such as imaging, drug delivery and gene therapy; however, it is not well understood how different factors such as the polyelectrolyte and salt concentration affect the coating on the nanoparticles and hence their performance. Here, these parameters were systematically varied and their effect on the stability of the colloidal

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Ningrum, Wulan Agustin, W. Wirasti, Yulian Wahyu Permadi, and Fida Faiqatul Himmah. "Uji Sediaan Lotion Nanopartikel Ekstrak Terong Belanda Sebagai Antioksidan." Jurnal Ilmiah Kesehatan 14, no. 1 (2021): 99. http://dx.doi.org/10.48144/jiks.v14i1.539.

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Abstrak. Nanopartikel adalah suatu teknologi formulasi suatu partikel yang terdispersi pada ukuran nanometer atau skala per seribu mikron. Tujuan penelitian ini adalah membuat sediaan lotion dari nanopartikel ekstrak terong belanda sebagai antioksidan. Teknologi nanopartikel ekstrak terong belanda mempunyai efek yang sangat baik sebagai antioksidan, sehingga dimungkinkan dibuat sediaan sebagai bahan kosmetik Penelitian ini menguji nanopertikel ekstrak terong belanda sebagai antioksidan sediaan lotion. Metode ekstraksi yang digunakan dalam penelitian ini adalah maserasi menggunakan pelarut meta

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Tang, Qishun, and Michael Rubinstein. "Where in the world are condensed counterions?" Soft Matter 18, no. 6 (2022): 1154–73. http://dx.doi.org/10.1039/d1sm01494c.

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A scaling model of the concentration profiles of both condensed and free counterions is presented for solutions of spherical and cylindrical charged nanoparticles of different charge valences, nanoparticle sizes, and salt concentrations.

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Sánchez, Jesús, Jose Ulloa, Yessenia Oyarzún, et al. "Enhancing the Mechanical Properties of Injectable Nanocomposite Hydrogels by Adding Boronic Acid/Boronate Ester Dynamic Bonds at the Nanoparticle–Polymer Interface." Gels 10, no. 10 (2024): 638. http://dx.doi.org/10.3390/gels10100638.

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Incorporating nanoparticles into injectable hydrogels is a well-known technique for improving the mechanical properties of these materials. However, significant differences in the mechanical properties of the polymer matrix and the nanoparticles can result in localized stress concentrations at the polymer–nanoparticle interface. This situation can lead to problems such as particle–matrix debonding, void formation, and material failure. This work introduces boronic acid/boronate ester dynamic covalent bonds (DCBs) as energy dissipation sites to mitigate stress concentrations at the polymer–nano

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Jamnongkan, Tongsai, Sathish K. Sukumaran, Masataka Sugimoto, Tomijiro Hara, Yumiko Takatsuka, and Kiyohito Koyama. "Towards novel wound dressings: antibacterial properties of zinc oxide nanoparticles and electrospun fiber mats of zinc oxide nanoparticle/poly(vinyl alcohol) hybrids." Journal of Polymer Engineering 35, no. 6 (2015): 575–86. http://dx.doi.org/10.1515/polyeng-2014-0319.

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Abstract Zinc oxide (ZnO) nanoparticles possess antibacterial properties. Being less toxic to humans than silver, they are attractive as antibacterial agents in biomedical applications. In this study, we focus on the influence of the size of ZnO nanoparticles on their antibacterial action against strains of three bacteria: one Gram-negative, Escherichia coli and two Gram-positive, Bacillus subtilis and Staphylococcus aureus. The antibacterial efficacy of the nanoparticles increases with decreasing particle size. A major contributor to antibacterial action is the oxidative stress induced by the

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Danelon, Tatiana, Rouhi Farajzadeh, Pavel Bedrikovetsky, and Grigori Chapiro. "Modeling Nanoparticle-Stabilized Foam Flow in Porous Media Accounting for Particle Retention and Permeability Reduction." InterPore Journal 2, no. 1 (2025): IPJ260225–3. https://doi.org/10.69631/ipj.v2i1nr57.

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This work presents a model for nanoparticle-stabilized foam flow in porous media, accounting for particle retention and the resulting permeability reduction. We present a semi-analytical solution under steady-state conditions, which allows for obtaining water saturation, foam apparent viscosity, and pressure drop profiles. We study different nanoparticle concentrations (in the presence and absence of salt) using retention parameters based on experimental data. When particle retention is neglected, the sweep efficiency of the porous medium improves compared to the case without nanoparticles, ev

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Martelli, Stefano, and James C. L. Chow. "Dose Enhancement for the Flattening-Filter-Free and Flattening-Filter Photon Beams in Nanoparticle-Enhanced Radiotherapy: A Monte Carlo Phantom Study." Nanomaterials 10, no. 4 (2020): 637. http://dx.doi.org/10.3390/nano10040637.

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Monte Carlo simulations were used to predict the dose enhancement ratio (DER) using the flattening-filter-free (FFF) and flattening-filter (FF) photon beams in prostate nanoparticle-enhanced radiotherapy, with multiple variables such as nanoparticle material, nanoparticle concentration, prostate size, pelvic size, and photon beam energy. A phantom mimicking the patient’s pelvis with various prostate and pelvic sizes was used. Macroscopic Monte Carlo simulation using the EGSnrc code was used to predict the dose at the prostate or target using the 6 MV FFF, 6 MV FF, 10 MV FFF, and 10 MV FF photo

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Ali, Hazim M., Khalid A. Fhaid, and Khairullah M. Awad. "Effectiveness of Nanoparticle-Based Treatments in Controlling Oligonychus afrasiaticus (McGregor) (Acari Tetranchidae) Infestation in Date Palm Trees." IOP Conference Series: Earth and Environmental Science 1262, no. 3 (2023): 032023. http://dx.doi.org/10.1088/1755-1315/1262/3/032023.

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Abstract Date palm mite Oligonychus afrasiaticus (McGregor) (Acari: Tetranychidae) infestations pose a significant threat to date palm plantations, leading to reduced crop yield and economic losses. Nanoparticle-based strategies have emerged as a promising approach for controlling mite populations due to their unique physicochemical properties and environmentally friendly nature. In this study, we investigated the impact of three different nanoparticle types, namely silver, silica, and sulphur, on the mortality rate of date palm mites at different life stages (larvae, nymphs, and adults). The

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Kiliç, Bayram, and Osman İpek. "Thermodynamic analysis of absorption cooling system with LiBr-Al2O3/water nanofluid using solar energy." Thermal Science, no. 00 (2020): 340. http://dx.doi.org/10.2298/tsci200817340k.

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Together with the developing nano technology, nano-fluids and nano-particles are used as working fluid in energy applications. It is foreseen that nanoparticles have high heat conduction coefficient and it will increase system performance by using as a working fluid in energy systems. Many studies in the literature show that nano fluids increase the heat transfer rate by improving heat transfer. In this study, a performance analysis of an absorption cooling system using solar energy was performed as numerically. LiBr-Al2O3/water nano-fluid has been used in the cooling system as working fluid.

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Metin, Cigdem, Roger T. Bonnecaze, and Quoc P. Nguyen. "The Viscosity of Silica Nanoparticle Dispersions in Permeable Media." SPE Reservoir Evaluation & Engineering 16, no. 03 (2013): 327–32. http://dx.doi.org/10.2118/157056-pa.

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Summary The potential application of nanoparticle dispersions as formation-stimulation agents, contrast agents, or simply as tracers in the upstream oil and gas industry requires knowledge of the flow properties of these nanoparticles. The modeling of nanoparticle transport in hydrocarbon reservoirs requires a comprehensive understanding of the rheological behavior of these nanofluids. Silica nanoparticles have been commonly used because of their low-cost fabrication and cost-effective surface modification. The aqueous silica-nanoparticle dispersions show Newtonian behavior under steady shear

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Bertholon, Isabelle, Gilles Ponchel, Denis Labarre, Patrick Couvreur, and Christine Vauthier. "Bioadhesive Properties of Poly(alkylcyanoacrylate) Nanoparticles Coated with Polysaccharide." Journal of Nanoscience and Nanotechnology 6, no. 9 (2006): 3102–9. http://dx.doi.org/10.1166/jnn.2006.418.

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Development of bioadhesive nanoparticles is of great interest to improve drug absorption through the intestinal barrier. Various Polysaccharide-coated poly(alkylcyanoacrylate) nanoparticles were prepared. The bioadhesive properties of the nanoparticles coated with dextran or chitosan in end-on or side-on conformation were evaluated with an ex-vivo adsorption experiment on rat intestine. Results show that diffusion of nanoparticles in mucus layer was governed by the nanoparticle diameter and isotherms of adsorption were influenced by the nature of polysaccharide used. High amount of nanoparticl

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Ramadhani, Pratidina Fitri, Sri Lelyati C. Masulili, Robert Lessang, Dian Fitri Chairunnisa, and Padmini Hari. "Synergistic antibacterial effects of aloe vera doped with Chitosan against Porphyromonas gingivalis as a natural periodontal inflammatory remedy." International Journal of Innovative Research and Scientific Studies 8, no. 3 (2025): 3922–32. https://doi.org/10.53894/ijirss.v8i3.7404.

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With the rise of antibiotic resistance, there is growing interest in developing herbal treatments for periodontal inflammation. Aloe vera has attracted scientific interest for its therapeutic potential, although formulating effective herbal medicines remains a challenge. Chitosan-based nanoparticles offer a promising strategy to enhance the delivery of herbal compounds. This study investigates the combination of Aloe vera extract and chitosan nanoparticles to create a potent antibacterial agent targeting Porphyromonas gingivalis, while also assessing its toxicity on BHK-21 fibroblast cells. Th

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Błaszczyk, Mariola M., and Łukasz Przybysz. "Determination of nanoparticles concentration in solution based on Pickering emulsion destabilization analyses." Applied Nanoscience 12, no. 1 (2021): 119–28. http://dx.doi.org/10.1007/s13204-021-02213-8.

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AbstractThe dynamic development of nanotechnology research has contributed to the fact that various types of nanoparticles are increasingly used on a large scale both for medical and biological purposes, but above all in many industrial fields. Such a wide application of nanoparticles is often connected with the need to estimate their characteristic parameters, such as size, size distribution or concentration. Existing instruments are usually quite expensive and not always available. Therefore, other cheaper and simpler methods based on analytical techniques are sought. In this paper, we have

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Hamouda, Aly A., and Rockey Abhishek. "Effect of Salinity on Silica Nanoparticle Adsorption Kinetics and Mechanisms for Fluid/Rock Interaction with Calcite." Nanomaterials 9, no. 2 (2019): 213. http://dx.doi.org/10.3390/nano9020213.

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This study addresses the kinetics of silica nanoparticle adsorption on calcite from a solution at three salinities: deionized water (DIW), synthetic seawater (SSW), and low salinity water (LSW). The nanoparticle adsorption mechanisms and the effects on calcite dissolution are addressed. It was shown that nanoparticle adsorption was best described with the second-order-kinetic model and that silica nanoparticle adsorption reduced calcite dissolution. This was confirmed by measuring the Ca2+ ion concentration, the pH, and by estimating the amount of calcite dissolved. This is an important conclu

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K. Fitri, M. Andry, T. N. Khairani, et al. "SYNTHESIS OF SILVER NANOPARTICLES USING ETHANOLIC EXTRACT OF Nelumbo nucifera Gaertn. LEAF AND ITS CYTOTOXIC ACTIVITY AGAINST T47D AND 4T1 CELL LINES." RASAYAN Journal of Chemistry 16, no. 01 (2023): 104–10. http://dx.doi.org/10.31788/rjc.2023.1618000.

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The cytotoxic activitiy of silver nanoparticles bio-functionalized by Nelumbo nucifera leaf extracts were examined in the current work. The nanoparticle (AgNPs) was characterized by scanning electron microscopy, UV–visible spectroscopy, and a particle size analyzer. Cytotoxic activity of silver nanoparticles against T47D and 4T1 cells using the MTT method using concentrations of 100 µg/mL, 50 µg/mL, and 25 µg/mL. For comparison, doxorubicin was used at the same dose. The size of the spherical nanoparticle was 66.4±0.93 nm and the polydispersity index was 0.23±0.05. Silver nanoparticles have an

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Hasan, Husam Abdulrasool, Jenan S. Sherza, Azher M. Abed, Hakim S. Sultan, and Kamaruzzaman Sopian. "Improve the performance of solar thermal collectors by varying the concentration and nanoparticles diameter of silicon dioxide." Open Engineering 12, no. 1 (2022): 743–51. http://dx.doi.org/10.1515/eng-2022-0339.

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Abstract The influence of different concentrations and nanoparticles’ diameter of silicon dioxide nanoparticles on the Nusselt number enhancement ratio and friction factor for solar thermal collector (STC) was examined numerically. The CFD model was designed to show the influence of the flow of water/SiO2 and pure water inside the pipe on the enhancement of the performance of the STC. Different concentrations of SiO2 nanoparticles are used (ϕ = 1–4%) with several nanoparticle diameters (dp = 20–50 nm). The water/SiO2 and pure water flow under different Reynolds numbers ranging from 5,000 to 30

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Pintilie, Stefan Catalin, Laurentia Geanina Tiron, Iulian Gabriel Birsan, Daniel Ganea, and Stefan Balta. "Influence of ZnO Nanoparticle Size and Concentration on the Polysulfone Membrane Performance." Materiale Plastice 54, no. 2 (2017): 257–61. http://dx.doi.org/10.37358/mp.17.2.4828.

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The activity of using membrane technology has developed fast in the treatment of wastewater, drinking water and process water production. The main challenges in membrane filtration are fouling reduction, permeability increase and high efficiency in retention. The best example of membrane enhancement is increasing hydrophilicity. Nanoparticles have been proven that their presence in the membrane matrix increases the water affinity significantly. Although the zinc oxide nanoparticles have a positive effect over the membrane performance, the influence of zinc oxide (ZnO) nanoparticle size has not

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Wang, Qi, Muhammad Rafiq, Yuzhen Lv, Chengrong Li, and Kai Yi. "Preparation of Three Types of Transformer Oil-Based Nanofluids and Comparative Study on the Effect of Nanoparticle Concentrations on Insulating Property of Transformer Oil." Journal of Nanotechnology 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/5802753.

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Nanofluids have the potential to become the alternatives of conventional transformer oil for their exquisite electrical and thermal properties. Three kinds of nanoparticles with distinct conductivities, namely, nonconductive nanoparticle Al2O3, conductive nanoparticle Fe3O4, and semiconductive nanoparticle TiO2, with different concentrations from 5% to 40% w/v were selected and suspended into transformer oil to develop nanofluids. The lightening impulse breakdown strengths of the oil samples with and without nanoparticles were measured according to IEC standard methods. The positive impulse br

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Zakharova, Olga V., Anna Yu Godymchuk, Alexander A. Gusev, Svyatoslav I. Gulchenko, Inna A. Vasyukova, and Denis V. Kuznetsov. "Considerable Variation of Antibacterial Activity of Cu Nanoparticles Suspensions Depending on the Storage Time, Dispersive Medium, and Particle Sizes." BioMed Research International 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/412530.

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Suspensions of Cu nanoparticles are promising for creating the new class of alternative antimicrobial products. In this study we examined copper nanoparticles of various sizes obtained by the method of wire electric explosion: nanopowder average size 50 nm (Cu 50) and 100 nm (Cu 100). The paper presents the complex study of the influence of physicochemical properties such as particle size and concentration of the freshly prepared and 24-hour suspensions of Cu nanoparticles in distilled water and physiological solution upon their toxicity to bacteriaE. coliM-17. Ionic solution of Cu2+and sodium

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Guo, Jinxin, Jialing Jian, Meng Wang, et al. "Ag nanoparticle-enhanced alkyl radical generation in photopolymerization for holographic recording." Nanophotonics 8, no. 10 (2019): 1795–802. http://dx.doi.org/10.1515/nanoph-2019-0188.

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AbstractWe report a new Ag nanoparticle-dispersed polymer nanocomposite for volume holographic recording through acrylic photopolymerization. The initial grating buildup dynamics at the inhibition stage are measured at various Ag nanoparticle concentrations. The refractive index modulation amplitude as large as 0.0069 at 633 nm is seen at the optimum Ag nanoparticle concentration of 1 wt.% with respect to the monomer. Electron paramagnetic resonance measurements show that Ag nanoparticles influence both the generation of alkyl radicals and the scavenging of oxygen in free radical photopolymeri

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Fetuga, I. A., O. O. Olakoyejo, O. Oluwatusin, et al. "Computational model of nano-pharmacological particles for the clinical management of stenotic and aneurysmatic coronary artery in the human body." Nigerian Journal of Technological Development 20, no. 1 (2023): 79–90. http://dx.doi.org/10.4314/njtd.v20i1.1293.

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This work presents a three-dimensional computational study of nanoparticles (metallic and non-metallic) suspended in blood flowing through a diseased artery with both stenosis and aneurysm. From the perspective of pharmacodynamics and heat transfer, the influence of nanoparticles on hemodynamic indicators was investigated in a diseased artery. The blood was flowing fluid, steady-state, incompressible, homogeneous, and Newtonian, while the artery was a rigid wall. The three-dimensional continuity, Navier-Stokes, and energy equations were solved numerically by using a RAN-based standard k-ω mode

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