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Articoli di riviste sul tema "Nanocomposite colloid"

Autore: Grafiati

Pubblicato: 12 aprile 2025

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1

Park, Jong-Min, Chan-Woo Lee, Wan-Sul Lee, Kyung-Mo Yang, Jun-Ho Lee, Gi-Yong Nam, Seong-Hoon Lee, Yong Sang Lee, Youngkwan Lee e Jae-Do Nam. "MONTMORILLONITE-REINFORCED NATURAL RUBBER NANOCOMPOSITES THROUGH EMULSION STABILIZATION–DESTABILIZATION METHOD". Rubber Chemistry and Technology 85, n. 2 (1 giugno 2012): 165–79. http://dx.doi.org/10.5254/rct.12.88978.

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Abstract A nanoplatelet of montmorillonite (MMT) was incorporated in the natural rubber (NR) matrix at a high loading content using a newly developed stabilization–destabilization process in the colloid states. Examination of the surface charge of the colloid drops by zeta potential measurement led to the identification of the stable and unstable conditions of the colloid mixture as well as each colloid system as a function of pH. The stabilized mixture of the MMT and NR colloids was subsequently destabilized by changing the pH of the mixture to achieve a well-dispersed and intercalated NR/MMT precipitate. The resulting NR/MMT nanocomposites provided an exfoliated MMT morphology up to 25 phr, and the mechanical properties and aging tolerance of the resulting nanocomposite vulcanizates were substantially enhanced by the incorporated MMT nanofillers. The developed stabilization–destabilization methodology ensured a highly loaded MMT rubber composite system, which could be used to obtain high performance NR/MMT nanocomposite systems with ease without using high-shear processing techniques.

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Susilowati, Endang, Mohammad Masykuri, Maria Ulfa e Dyah Puspitasari. "Preparation of Silver-Chitosan Nanocomposites Colloidal and Film as Antibacteri Material". JKPK (Jurnal Kimia dan Pendidikan Kimia) 5, n. 3 (31 dicembre 2020): 300. http://dx.doi.org/10.20961/jkpk.v5i3.46711.

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<p>Colloidal nanocomposites silver-chitosan have been made. Silver nanoparticles were produced by chemical reduction methods assisted microwave irradiation using chitosan from crab shells as a reducing agent and stabilizer, AgNO<sub>3 </sub>as a precursor and NaOH as an accelerator. This study investigated AgNO<sub>3</sub> concentration toward localized surface plasmon resonance (LSPR) phenomenon of nanocomposites colloidal. The size and shape of the silver nanoparticles were confirmed by TEM. Furthermore, the stability of the storage was observed for twelve weeks. Colloidal and film nanocomposites silver- chitosan have been made by casting method by drying at room temperature. After that, the film characterization was carried out, including swelling with gravimetry methods and surface morphology using scanning electron microscopy (SEM). Diffusion methods tested colloid antibacterial activity and silver-chitosan nanocomposite film’s against <em>E. Coli</em> and <em>S. Aureus</em>. The results showed that the formation of silver nanoparticles was identified by the LSPR absorption band's appearance at 413-419 nm. The increasing of AgNO<sub>3</sub> concentration increased the intensity of the LSPR absorption band. Silver nanoparticles with sizes of about 3-9 nm are spherical. The silver nanoparticles were stable at 12 weeks of storage. The higher AgNO<sub>3</sub> concentration tends to increase the swelling of the film. The surface of the silver-chitosan nanocomposite film’s was rougher than that of the chitosan film. The higher the silver nanoparticle concentration, the higher the colloid and film antibacterial activity against <em>E. Coli</em> and <em>S. Aureus.</em></p>

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Krkljes, Aleksandra, Miodrag Mitric e Zorica Kacarevic-Popovic. "Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values". Chemical Industry 62, n. 3 (2008): 101–6. http://dx.doi.org/10.2298/hemind0803101k.

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Nanocomposites which consist of polymer matrix and nanoparticles of noble metal are a very important class of nanomaterials. The optical properties of these materials are strongly dependent on the nanoparticles size as well as on the synthesized procedure of nanocomposites preparation. In this work the Au nanoparticles were synthesized by the simple radiolytic procedure, using steady state gamma irradiation, under different pH values. PVA/Au nanocomposite films were obtained by solvent evaporation from Au colloids. UV-Vis absorption spectra of Au colloids show absorption in the range of 450 to 650 nm with the maximum around 520 nm, which is the typical plasmon band of Au nanoparticles. Absorption spectra of PVA/Au nanocomposites are red shifted compared to corresponding primary Au colloids. This red shift is not result of any change in particle size distribution and can be explained by the change of dielectric property of surrounding medium. IR spectra indicated anchoring the OH groups of PVA molecule at the cluster surface. This effect limits the growing of the metal clusters and confirmed that the PVA is a god matrix for in situ synthesis of Au nanoparticles. The size of Au nanoparticles is dependent on the experimental conditions. Obtained results indicated that the pH value of solution played an important role. The values of absorption maximum (?max) were not dependent on the concentration of Au cations, but show strong dependence on the pH value of the initial solution. The increase of pH value reduced the mean diameters of nanoparticles. The lowest value of ?max was obtained for colloid with pH 7, which theoretically corresponds to the nanoparticles with minimum dimension. These results are in agreement with the XRD measurement of PVA/Au nanocomposite films and theoretical calculations. According to obtained results of radiolytic synthesis of Au nanoparticles in PVA solution can be conclude that it is possible to control the particle size by tuning the pH value of solution.

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4

Li, Bao Guang, Yong Zi Xu, Lu Bai, Huan Dai, Cai Cai Xie e Hai Bin Li. "Ultrasonic Effect on Fabrication of Intercalated MgAl-LDH/PVA Nanocomposites via Exfoliation-Adsorption Route". Key Engineering Materials 727 (gennaio 2017): 532–36. http://dx.doi.org/10.4028/www.scientific.net/kem.727.532.

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Glycine intercalated Mg/Al-layered double hydroxides (LDH-G)/PVA nanocomposites were prepared via exfoliation-adsorption route based on exfoliation of LDH-G in formamide. The effect of ultrasonic treatment on the fabrication of LDH-G/PVA nanocomposites was investigated. The results of XRD suggest that chains of PVA with double layer arrange into the galleries of restacking LDH platelets with the formation of intercalated-type nanocomposite. Experiments present that ultrasonic treatment on the colloid of LDH-G/PVA increases the amount of platelet which forms the intercalated phase, and improves the regularity of LDH-G arrays in the c direction. It is demonstrated the exfoliated LDH platelets orient in its normal paralleling the flow direction at the high shear rate induced by ultrasound. Simultaneously, under the enhanced temperature caused by long term of ultrasonic treatment, PVA chains extend more and the interaction between PVA chains and LDH layers is reinforced. A model was proposed for various stages of LDH platelets and PVA chains in their mixed colloid during ultrasonic treatment which describes the fabrication of improved hybrid structure.

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LEPESHKIN, N. N., W. KIM, V. P. SAFONOV, J. G. ZHU, R. L. ARMSTRONG, C. W. WHITE, R. A. ZUHR e V. M. SHALAEV. "OPTICAL NONLINEARITIES OF METAL-DIELECTRIC COMPOSITES". Journal of Nonlinear Optical Physics & Materials 08, n. 02 (giugno 1999): 191–210. http://dx.doi.org/10.1142/s021886359900014x.

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Nonlinear optical properties of metal-dielectric composites, such as fractal colloid aggregates and clusters created by ion implantation, are studied. Strong fluctuations of local fields result in huge enhancements of optical nonlinearities in fractal colloid aggregates. The real and imaginary parts of the cubic susceptibility of silver colloid aggregates are measured. It is found that the coefficient of nonlinear absorption strongly depends on the laser wavelength and intensity. Optical limiting effect in fractal silver colloids is observed. Nondegenerate forward four-wave mixing technique is used to investigate the third-order nonlinear susceptibility for nanocomposite material with Au nanocrystals formed inside a SiO 2 glass matrix. The Au nanocrystals are formed by the ion implantation and annealing method that produces very high volume fraction of nanoparticles. The large value |χ(3)|=1.3×10-7 esu is measured. Two characteristic relaxation times, 5.3 ps and 0.66 ps, are estimated from the detuning curve of |χ(3)|, as the probe beam wavelength changes. A novel class of optical materials, microcavities doped with nanostructured fractal aggregates, is also studied. In our experiments, lasing at extremely low pump intensities, below 1 mW, and dramatically enhanced Raman scattering was observed in microcavity/fractal composites.

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6

Mitzscherling, S., Q. Cui, W. Koopman e M. Bargheer. "Dielectric function of two-phase colloid–polymer nanocomposite". Physical Chemistry Chemical Physics 17, n. 44 (2015): 29465–74. http://dx.doi.org/10.1039/c5cp04326c.

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Vinogradov, Alexandr V., A. A. Levshanov, M. A. Kashirin, A. V. Agafonov e Vladimir V. Vinogradov. "Magneto-Optical Modulation on Colloid Cu–Ni Nanocomposite". Journal of Physical Chemistry C 119, n. 3 (12 gennaio 2015): 1500–1505. http://dx.doi.org/10.1021/jp511736f.

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8

Stojkovska, Jasmina, Jovana Zvicer, Zeljka Jovanovic, Vesna Miskovic-Stankovic e Bojana Obradovic. "Controlled production of alginate nanocomposites with incorporated silver nanoparticles aimed for biomedical applications". Journal of the Serbian Chemical Society 77, n. 12 (2012): 1709–22. http://dx.doi.org/10.2298/jsc121108148s.

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Production of nanocomposite alginate microbeads with electrochemically synthesized silver nanoparticles (AgNPs) based on electrostatic extrusion technique was investigated with respect to potentials for utilization in pharmaceutical and biomedical applications. It was shown that electrochemical synthesis of AgNPs results in reduction of practically all Ag+ ions present in the initial solution yielding stable Ag/alginate colloid solutions that were demonstrated to be suitable for sterilization, manipulation, and electrostatic extrusion with retention of AgNPs. Presence of AgNPs in alginate colloid solutions had negligible effects on the size of the produced Ag/alginate microbeads, which was chiefly determined by the applied electrostatic potential during the extrusion. On the other hand, incorporation of AgNPs within the alginate hydrogel induced slight changes in biomechanical properties determined in a biomimetic bioreactor, so that packed beds of nanocomposite Ag/alginate microbeads exhibited slightly higher dynamic compression modulus as compared to that of control alginate microbeads (154 ? 4 and 141 ? 2 kPa, respectively). On the other hand, equilibrium unconfined compression modulus was significantly lower for nanocomposite microbeads as compared to that of controls (34 ? 2 and 47 ? 0.5 kPa, respectively).

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9

Vodnik, Vesna V., Dušan K. Božanić, Nataša Bibić, Zoran V. Šaponjić e Jovan M. Nedeljković. "Optical Properties of Shaped Silver Nanoparticles". Journal of Nanoscience and Nanotechnology 8, n. 7 (1 luglio 2008): 3511–15. http://dx.doi.org/10.1166/jnn.2008.144.

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The influence of shape and dielectric property of surrounding media on surface plasmon absorption band of silver nanoparticles was studied. Spherical silver nanoparticles (d = 5.6 nm) synthesized in water using NaBH4 as a reducing agent are transferred in non-polar solvent (chloroform) with phase-transfer reagent oleylamine. The absorption spectrum of oleylamine-capped silver nanoparticles dispersed in chloroform shows a strong surface plasmon resonance band that is 19 nm red-shifted compared to unmodified particles in water. The values for peak position and corresponding half widths are compared with theoretical calculations based on Mie theory. Prismatic and plate-like silver nanoparticles were synthesized in water using trisodium citrate as a reducing agent and cetyltrimethylammonium bromide as stabilizer. Due to structural anisotropy of prismatic and plate-like silver nanoparticles three surface plasmon resonance bands were observed in absorption spectrum. Nanocomposites consisting of non-spherical silver nanoparticles and polyvinyl alcohol exhibit different optical properties compared to water colloid. Instead of three surface plasmon bands, nanocomposite film has only one peak at 460 nm. Reason for appearance of single surface plasmon resonance band in nanocomposite film was discussed according to Maxwell-Garnet theory.

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Chaurasia, Alok, Nanda Gopal Sahoo, James T. McLeskey e Xiao Hu. "Development and Characterization of Biocompatible Fullerene [C60]/Amphiphilic Block Copolymer Nanocomposite". Journal of Spectroscopy 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/578160.

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We report a supramolecular process for the synthesis of well-defined fullerene (C60)/polymer colloid nanocomposites in an aqueous solution via complex formation. A biocompatible triblock poly(4-vinylpyridine)-b-polyethylene-b-poly(4-vinylpyridine), P4VP8-b-PEO105-b-P4VP8, was synthesized by atom transfer radical polymerization. The block copolymer formed complexes with C60in toluene and resulted in fullerene assembly in cluster form. Nanocomposite dispersion in an aqueous solution could be obtained using an aged solution of the polymer/C60/toluene solution by a solvent evaporation technique. The UV-Vis and FTIR spectroscopy confirmed the complex formation of fullerene with the polymer which plays a significant role in controlling the PDI and size of polymer/C60micelles in the toluene solution. The particle size and morphology of P4VP8-b-PEO105-b-P4VP8and P4VP8-b-PEO105-b-P4VP8/C60mixture were studied by dynamic light scattering (DLS) and transmission electron microscopy (TEM). In a cytotoxicity test, both pure polymer and the resulting polymer/C60composite in water showed more than 90% cell viability at 1 mg/mL concentration.

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Serkhacheva, N. S., N. I. Prokopov, A. Yu Gerval'd, N. A. Lobanov e I. A. Gritskova. "The Heterophase Polymerisation of Styrene in the Presence of Zinc Oxide Nanoparticles". International Polymer Science and Technology 44, n. 10 (ottobre 2017): 13–18. http://dx.doi.org/10.1177/0307174x1704401003.

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Heterophase polymerisation of styrene was carried out, and nanocomposite polystyrene microspheres with a controllable content of ZnO nanoparticles were synthesised. The colloid chemical properties of the obtained polymer suspensions were studied, and it was shown that the particles have a ‘core–shell’ structure with a ZnO content of up to 30%.

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Sahiner, Nurettin. "Colloidal nanocomposite hydrogel particles". Colloid and Polymer Science 285, n. 4 (3 novembre 2006): 413–21. http://dx.doi.org/10.1007/s00396-006-1583-7.

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13

Gulina, L. B., V. P. Tolstoi e K. B. Semishchenko. "Layers of nanocomposite FeOOH-xH3PW12O40 synthesized by ion-colloid layering". Russian Journal of Applied Chemistry 83, n. 1 (gennaio 2010): 151–53. http://dx.doi.org/10.1134/s1070427210010283.

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14

Zhang, Yuanjiao, Ningning Wang, Jie He, Liangguo Da e Zhong Li. "Synthesis of CeO2/e-HTiNbO5 Nanocomposite and Its Application for Photocatalytic Oxidation Desulfurization". Nano 11, n. 02 (febbraio 2016): 1650018. http://dx.doi.org/10.1142/s1793292016500181.

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Nanoscaled CeO2/e-HTiNbO5 composite was assembled by a facile process using colloidal TiNbO[Formula: see text] (e-HTiNbO5) nanosheet and CeO2 colloid as precursors at room temperature. The nanosheet e-HTiNbO5 was obtained through proton-exchange and exfoliation process from its parent KTiNbO5. The microstructures and properties of the as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Laser Raman spectroscopy (LRS), and UV-vis diffuse reflectance spectroscopy (UV-vis DRS), etc. The photocatalytic activity of the obtained nanocomposite is evaluated by the adsorption and photocatalytic oxidation of ethyl mercaptan (EM) under natural light irradiation. The results show that CeO2 nanoparticles are dispersed uniformly on the surface of e-HTiNbO5 and the layered structure of e-HTiNbO5 nanosheet maintains integrity. The interaction between dispersed CeO2 particles and e-HTiNbO5 results in lower bandgap compared to its precursors, and the photocatalytic activity of CeO2/e-HTiNbO5 are enhanced under natural light irradiation.

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15

Araujo, Robson T., Maria S. B. Neta, José A. H. Coaquira, Sacha B. Chaves e Fabricio Machado. "A New Design for Magnetic Poly(vinyl pivalate) for Biomedical Applications: Synthesis, Characterization, and Evaluation of Cytotoxicity in Fibroblasts, Keratinocytes, and Human Melanoma Cells". Colloids and Interfaces 6, n. 1 (21 gennaio 2022): 7. http://dx.doi.org/10.3390/colloids6010007.

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Polymers containing magnetic properties play an important role in biomedical therapies, such as embolotherapy or hyperthermia, for their differentiated properties. In this work, magnetite (Fe3O4) nanoparticles were synthesized by the coprecipitation method and dispersed into a thermoplastic matrix of poly(vinyl pivalate) through an emulsion polymerization process. The main goal was the individual encapsulation of magnetite nanoparticles to improve the magnetic response of the magneto-polymeric materials using polymerizable carboxylic acids as coating agents, minimizing the leaching of nanoparticles throughout the nanocomposite formation. For this purpose, synthesized magnetite had its surface modified by acrylic acid or methacrylic acid to improve its individual encapsulation during the polymerization step, thus generating a series of magnetic nanocomposite materials containing different amounts of magnetite intended for biomedical applications. X-ray diffractometry and TEM measurements provided a mean size of approximately 8 nm for the pure magnetite nanoparticles and a spherical morphology. Acid-functionalized Fe3O4 had a size of approximately 6 nm, while the nanocomposites showed a size of approximately 7 nm. Magnetization measurement provided a saturation magnetization value of approximately 75 emu/g and confirmed superparamagnetic behavior at room temperature. DSC analysis showed a glass transition temperature of 65 °C for poly(vinyl pivalate)-based nanocomposites. The tests realized with homopolymer and magnetic composites against different cell lineages (i.e., fibroblasts, keratinocytes, and human melanoma) to evaluate the levels of cytotoxicity showed good results in the different exposure times and concentrations used, since the obtained results showed cell viability greater than 70% compared to the control group, suggesting that the synthesized materials are very promising for medical applications.

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Wan Ikhsan, Syarifah Nazirah Wan, Norhaniza Yusof, Farhana Aziz, Ahmad Fauzi Ismail, Norazanita Shamsuddin, Juhana Jaafar, Wan Norharyati Wan Wan Salleh, Pei Sean Goh, Woei Jye Lau e Nurasyikin Misdan. "Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology". Nanomaterials 12, n. 20 (19 ottobre 2022): 3673. http://dx.doi.org/10.3390/nano12203673.

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In this current study, facile, one-pot synthesis of functionalised nanocomposite coating with simultaneous hydrophilic and oleophobic properties was successfully achieved via the sol–gel technique. The synthesis of this nanocomposite coating aims to develop a highly efficient, simultaneously oleophobic-hydrophilic coating intended for polymer membranes to spontaneously separate oil-in-water emulsions, therefore, mitigating the fouling issue posed by an unmodified polymer membrane. The simultaneous hydrophilicity-oleophobicity of the nanocoating can be applied onto an existing membrane to improve their capability to spontaneously separate oil-in-water substances in the treatment of oily wastewater using little to no energy and being environmentally friendly. The synthesis of hybrid chitosan–silica (CTS-Si)/halloysite nanotube (HNT) nanocomposite coating using the sol–gel method was presented, and the resultant coating was characterised using FTIR, XPS, XRD, NMR, BET, Zeta Potential, and TGA. The wettability of the nanocomposite coating was evaluated in terms of water and oil contact angle, in which it was coated onto a polymer substrate. The coating was optimised in terms of oil and water contact angle using Response Surface Modification (RSM) with Central Composite Design (CCD) theory. The XPS results revealed the successful grafting of organosilanes groups of HNT onto the CTS-Si denoted by a wide band between 102.6–103.7 eV at Si2p. FTIR spectrum presented significant peaks at 3621 cm−1; 1013 cm−1 was attributed to chitosan, and 787 cm−1 signified the stretching of Si-O-Si on HNT. 29Si, 27Al, and 13H NMR spectroscopy confirmed the extensive modification of the particle’s shells with chitosan–silica hybrid covalently linked to the halloysite nanotube domains. The morphological analysis via FESEM resulted in the surface morphology that indicates improved wettability of the nanocomposite. The resultant colloids have a high colloid stability of 19.3 mV and electrophoretic mobility of 0.1904 µmcm/Vs. The coating recorded high hydrophilicity with amplified oleophobic properties depicted by a low water contact angle (WCA) of 11° and high oil contact angle (OCA) of 171.3°. The optimisation results via RSM suggested that the optimised sol pH and nanoparticle loadings were pH 7.0 and 1.05 wt%, respectively, yielding 95% desirability for high oil contact angle and low water contact angle.

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Al-Salih, Moatasem, Syakirah Samsudin e Siti Suri Arshad. "Synthesis and characterizations titanium dioxide nanocomposite by laser ablation for antimicrobial applications". Journal of Bacteriology & Mycology: Open Access 7, n. 4 (2019): 81–84. http://dx.doi.org/10.15406/jbmoa.2019.07.00249.

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A composite nanoparticle containing Titanium Dioxide is synthesized by pulsed laser ablation. Oxide nanoparticles NPs have wide ranges of physical, chemical and biological properties. The main advantages In the present work, studying the characterization of colloid TiO2 NPs were synthesis by PLAL and investigated the antibacterial activity of colloidal TiO2 NPs compared to the antibacterial activity of synthesized composite nanoparticles was tested against four different pathogen bacteria two-gram negative (Escherichia coli (E. coli), Klebsiella pneumoniae (K. pneumoniae)), institute of bioscience UPM university kindly supplied these bacteria. The bacterial suspension was made and adjusted by comparison against 0.5Mc-Farland turbidity typical (5x107cell ml-1) tubes. It was further diluted to obtain a final of 5x106cell ml-1. All bacteria strains were culture in agar media. The media was inoculated by the 0.2ml/5ml with either the bacteria strains, then added 0.5ml of TiO2 nanoparticles at concentration 200, 400,600ml-1. The samples were incubated at 37°C. The bacterial growth was measured by optical density that absorbs strongly at 532nm wavelength. Conclusion that is the mean values of inhibition were calculated from triple evaluation in each assessment.

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Varesano, Alessio, Claudia Vineis, Cinzia Tonetti, Diego Ramirez, Giorgio Mazzuchetti, Simona Ortelli, Magda Blosi e Anna Costa. "Multifunctional Hybrid Nanocomposite Nanofibers Produced by Colloid Electrospinning from Water Solutions". Current Nanoscience 11, n. 1 (1 dicembre 2014): 41–48. http://dx.doi.org/10.2174/1573413710666140922225056.

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Toyoda, Naoya, Tetsuya Yamamoto, Kenji Arakawa e Aiko Teshima. "Preparation of PVA/Polymer Colloid nanocomposite Hydrogel Using PS-PNVA Particles". Chemistry Letters 48, n. 4 (5 aprile 2019): 378–81. http://dx.doi.org/10.1246/cl.181042.

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Alsalih, Moatasem Wdaah, Syakirah Samsudin e Siti Suri Arshad. "Ma Synthesis and characterizations Titanium Dioxide Nanocomposite by Laser Ablation for Antimicrobial Applications". Science Proceedings Series 1, n. 3 (12 settembre 2019): 26–29. http://dx.doi.org/10.31580/sps.v1i3.886.

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Background: a composite nanoparticles containing Titanium Dioxide are synthesized by pulsed laser ablation. oxide nanoparticles NPs have wide ranges of physical, chemical and biological properties. The main advantages In the present work, studying the characterization of colloid TiO2 NPs were synthesis by PLAL and investigated the antibacterial activity of colloidal TiO2NPs compared to the antibacterial activity of synthesized composite nanoparticles was tested against four different pathogen bacteria two-gram negative (Escherichia coli (E. coli), Klebsiella pneumoniae (K. pneumoniae )), institute of bioscience UPM university kindly supplied these bacteria. The bacterial suspension was made and adjusted by comparison against 0.5 Mc-Farland turbidity typical (5x 107cell ml-1) tubes. It was further diluted to obtain a final of 5 x 106cell ml-1. All bacteria strains were culture in agar media. The media was inoculated by the 0.2 ml/5ml with either the bacteria strains, then added 0.5 ml of TiO2 nanoparticles at concentration200, 400,600 ml-1. The samples were incubated at 37 Â°C. The bacterial growth was measured by optical density that absorbs strongly at 532 nm wavelength. Conclusion that is the mean values of inhibition were calculated from triple evaluation in each assessment.

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Yao, Jia, Zhihai Cao, Yi Shang, Qun Chen, Lin Yang, Yushan Zhang e Dongming Qi. "Preparation of polymeric/inorganic nanocomposite particles in miniemulsions: II. Narrowly size-distributed polymer/SiO2 nanocomposite particles". Colloids and Surfaces A: Physicochemical and Engineering Aspects 530 (ottobre 2017): 104–16. http://dx.doi.org/10.1016/j.colsurfa.2017.07.047.

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Yang, Kui, Chang Hui Yang e Zhen Li. "Synthesis and Characterization of PVA/MMT Porous Nanocomposite Prepared by Directional Freeze-Drying Method". Advanced Materials Research 197-198 (febbraio 2011): 253–60. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.253.

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Porous PVA/MMT nanocomposites, which included a great deal of macroporous, mesoporous and a few micorporous were fabricated by directional freezing and freeze-drying. X-ray diffraction (XRD), Scan Electric Microscope (SEM), Fourier Transform Infrared (FT-IR) spectroscopy, and Thermo gravimetric-differential scanning calorimeter analysis (TG-DSC) were used characterize the samples. Results showed that the morphology and the interactions between MMT and PVA of the obtained porous nanocomposites were influenced by nanoparticle size, colloid concentration , aging time etc.O-H bond in PVA and Si-O bond in MMT, "acetate" in PVA and O-H bond in particle flat of MMT which occurred coupling constituted hydrogen bonding which enhanced the driving power to help PVA molecules insert into interlayer spaces of MMT.

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Zhang, Jianyuan, Peter J. Santos, Paul A. Gabrys, Sangho Lee, Caroline Liu e Robert J. Macfarlane. "Self-Assembling Nanocomposite Tectons". Journal of the American Chemical Society 138, n. 50 (9 dicembre 2016): 16228–31. http://dx.doi.org/10.1021/jacs.6b11052.

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Khomutov, Gennady B., Vitaly P. Kim, Yury A. Koksharov, Kirill V. Potapenkov, Alexander A. Parshintsev, Eugene S. Soldatov, Nazym N. Usmanov et al. "Nanocomposite biomimetic vesicles based on interfacial complexes of polyelectrolytes and colloid magnetic nanoparticles". Colloids and Surfaces A: Physicochemical and Engineering Aspects 532 (novembre 2017): 26–35. http://dx.doi.org/10.1016/j.colsurfa.2017.07.035.

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Schexnailder, Patrick, e Gudrun Schmidt. "Nanocomposite polymer hydrogels". Colloid and Polymer Science 287, n. 1 (29 ottobre 2008): 1–11. http://dx.doi.org/10.1007/s00396-008-1949-0.

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ALAM, FAHAD, SAJID ALI ANSARI, WASI KHAN, M. EHTISHAM KHAN e A. H. NAQVI. "SYNTHESIS, STRUCTURAL, OPTICAL AND ELECTRICAL PROPERTIES OF IN-SITU SYNTHESIZED POLYANILINE/SILVER NANOCOMPOSITES". Functional Materials Letters 05, n. 03 (settembre 2012): 1250026. http://dx.doi.org/10.1142/s1793604712500269.

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Polyaniline (PANI) is recognized as one of the most important conducting polymers due to its high conductivity and good stability. In this paper, polyaniline/silver (PANI/Ag) nanocomposites were synthesized by in-situ polymerization of aniline using ammonium peroxydisulphate (APS) as oxidizing agent with varying concentration of Ag nanoparticles colloids (0 ml, 25 ml and 50 ml). Silver nanoparticles were synthesized separately in colloidal form from silver nitrate (Ag2NO3) with the help of reducing agent sodium borohydride (NaBH4). The PANI/ Ag nanocomposites were characterized by XRD, SEM, AFM, UV-visible, temperature dependent resistivity and dielectric measurements. All samples show a single phase nature of the nanoparticles. The electrical resistivity as function of temperature was measured in the temperature range 298–383 K, which indicates a semiconducting to metallic transition at 373 K and 368 K for 25 ml and 50 ml silver colloid samples, respectively.

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Telipan, Gabriela, Lucian Pîslaru-Dănescu, Eduard-Marius Lungulescu, Ioana Ion e Virgil Marinescu. "A Comparative Study of Polypyrrole and Ag/Polypyrrole Hybrid Nanocomposites as Sensitive Material Used for New Dry Polarizable Bioimpedance Sensors". Applied Sciences 11, n. 9 (2 maggio 2021): 4168. http://dx.doi.org/10.3390/app11094168.

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Three types of dry polarizable electric bioimpedance sensor for skin bioimpedance monitoring without skin preparation have been developed. The sensitive materials as a component of these sensors are the conductive polypyrrole and hybrid nanocomposite polypyrrole-Ag, with 10% and 20% Ag incorporated in the polypyrrole matrix. The hybrid nanocomposites Ag nanoparticles (NPs)/polypyrrole were obtained by introducing the colloid solution of Ag NPs in pyrrole solution, followed by polymerisation, and calculated for 10% and 20% of monomer’s mass. The structural characterisation and morphological analysis of these sensitive materials were carried-out by Raman spectrometry, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. In making the electrodes, the technique of pressing powders of polypyrrole and hybrid composites Ag NPs/polypyrrole in a hydraulic press was used in the form of a disk. The electric bioimpedance performance of sensors was investigated using a two-point method in the frequency range of 1–300 kHz, at a voltage of 2 Vpeak-peak, on six human subjects, three men and three women. For these three bioimpedance sensors, it was found that the electric bioimpedance of the skin decreases across the frequency range and shows good linearity of the impedance-frequency curve on the range frequency of interest in bioimpedance measurements.

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28

Fernández-Álvarez, Fátima, Gracia García-García e José L. Arias. "A Tri-Stimuli Responsive (Maghemite/PLGA)/Chitosan Nanostructure with Promising Applications in Lung Cancer". Pharmaceutics 13, n. 8 (10 agosto 2021): 1232. http://dx.doi.org/10.3390/pharmaceutics13081232.

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A (core/shell)/shell nanostructure (production performance ≈ 50%, mean diameter ≈ 330 nm) was built using maghemite, PLGA, and chitosan. An extensive characterization proved the complete inclusion of the maghemite nuclei into the PLGA matrix (by nanoprecipitation solvent evaporation) and the disposition of the chitosan shell onto the nanocomposite (by coacervation). Short-term stability and the adequate magnetism of the nanocomposites were demonstrated by size and electrokinetic determinations, and by defining the first magnetization curve and the responsiveness of the colloid to a permanent magnet, respectively. Safety of the nanoparticles was postulated when considering the results from blood compatibility studies, and toxicity assays against human colonic CCD-18 fibroblasts and colon carcinoma T-84 cells. Cisplatin incorporation to the PLGA matrix generated appropriate loading values (≈15%), and a dual pH- and heat (hyperthermia)-responsive drug release behaviour (≈4.7-fold faster release at pH 5.0 and 45 °C compared to pH 7.4 and 37 °C). The half maximal inhibitory concentration of the cisplatin-loaded nanoparticles against human lung adenocarcinoma A-549 cells was ≈1.6-fold less than that of the free chemotherapeutic. Such a biocompatible and tri-stimuli responsive (maghemite/PLGA)/chitosan nanostructure may found a promising use for the effective treatment of lung cancer.

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Ponomarev, I. V., E. A. Trusova e A. M. Afzal. "Synthesis of graphene-CeO2 nanocomposite using dodecylamine". Physics and Chemistry of Materials Treatment 5 (2022): 53–62. http://dx.doi.org/10.30791/0015-3214-2022-5-53-62.

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A method is proposed for the synthesis of nanostructured composites based on graphene and CeO2, which combines sol-gel and sonochemical methods. A feature of the method is that when the graphene content is not more than 2 wt. %, its uniform distribution in the volume of the material is achieved without the formation of an impurity phase. In addition, oxygen-free graphene with a sheet thickness of 3 – 5 nm was used in the synthesis as a suspension obtained by ultrasonic exfoliation in an alkalized by KOH aqua-alcohol solution of dodecylamine. The formation of a composite in a mixed colloid occurs in such a way that the sol-gel transition and subsequent crystallization of nano-CeO2 occur on the graphene sheets. However, the chemical interaction of the latter and CeO2 in the composite is not observed, which contributes to the preservation of the sp2-electrons system of graphene and, as a result, the preservation of its unique electronic properties. The graphene sheets form a layered structure of composite agglomerates, and isolated CeO2 nanocrystals are incorporated into these differently oriented layers. It has been determine that CeO2 dispersion in the composite is higher than in pure CeO2 nanopowder. Estimating the phase and chemical purity of the synthesized composite, it can be argued that the developed method for obtaining nanostructured powders based on graphene and CeO2 is promising as the basis for an economical and environmentally friendly technology for the production of initial substances for fine-grained electrical ceramics.

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de Oliveira Machado, Vagner, Ângela Leão Andrade, José Domingos Fabris, Erico Tadeu Fraga Freitas, José Maria da Fonte Ferreira, Alice Simon, Rosana Zacarias Domingues et al. "Preparation of hybrid nanocomposite particles for medical practices". Colloids and Surfaces A: Physicochemical and Engineering Aspects 624 (settembre 2021): 126706. http://dx.doi.org/10.1016/j.colsurfa.2021.126706.

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31

Yin, Han, Huifang Chen e Dajun Chen. "Viscoelastic behavior of poly(acrylonitrile)/attapulgite nanocomposite solution". Colloids and Surfaces A: Physicochemical and Engineering Aspects 367, n. 1-3 (settembre 2010): 52–59. http://dx.doi.org/10.1016/j.colsurfa.2010.06.017.

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32

Najafi, Ebrahim, e Kwanwoo Shin. "Radiation resistant polymer–carbon nanotube nanocomposite thin films". Colloids and Surfaces A: Physicochemical and Engineering Aspects 257-258 (maggio 2005): 333–37. http://dx.doi.org/10.1016/j.colsurfa.2004.10.076.

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33

Ye, Hui-Jian, Wen-Zhu Shao e Liang Zhen. "Tetradecylphosphonic acid modified BaTiO3 nanoparticles and its nanocomposite". Colloids and Surfaces A: Physicochemical and Engineering Aspects 427 (giugno 2013): 19–25. http://dx.doi.org/10.1016/j.colsurfa.2013.02.068.

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34

Xing, Dan, Xiong-Yu Xi, Cun-Guang Liang, Peng-Cheng Ma, Qingbin Zheng e Hui Li. "Thermoelectric performance of basalt fiber with nanocomposite sizing". Colloids and Surfaces A: Physicochemical and Engineering Aspects 672 (settembre 2023): 131761. http://dx.doi.org/10.1016/j.colsurfa.2023.131761.

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35

Kang, Yuetong, Jingkai Zhang, Zhenglin Wu, Yi Wei, Yujie Cong e Xiaoyu Wang. "Thermal-responsive gated nanocomposite of antibacterial gold nanoclusters". Colloids and Surfaces A: Physicochemical and Engineering Aspects 684 (marzo 2024): 133169. http://dx.doi.org/10.1016/j.colsurfa.2024.133169.

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36

Falkner, Joshua C., Mary E. Turner, Joan K. Bosworth, Timothy J. Trentler, John E. Johnson, Tianwei Lin e Vicki L. Colvin. "Virus Crystals as Nanocomposite Scaffolds". Journal of the American Chemical Society 127, n. 15 (aprile 2005): 5274–75. http://dx.doi.org/10.1021/ja044496m.

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37

Patil, Vijaya, e Murali Sastry. "Formation of Close-Packed Silver Nanoparticle Multilayers from Electrostatically Grown Octadecylamine/Colloid Nanocomposite Precursors". Langmuir 16, n. 5 (marzo 2000): 2207–12. http://dx.doi.org/10.1021/la990103z.

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38

Shabalina, Anastasiia V., Tatyana I. Izaak, Tamara S. Kharlamova, Darya O. Martynova, Ivan N. Lapin e Valery A. Svetlichnyi. "Ag/SiOx nanocomposite powders synthesized from colloids obtained by pulsed laser ablation". Colloids and Surfaces A: Physicochemical and Engineering Aspects 553 (settembre 2018): 80–88. http://dx.doi.org/10.1016/j.colsurfa.2018.05.047.

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39

Vislohuzova, T. V., N. A. Galatenko, R. A. Rozhnova, V. M. Bogatyrov e M. V. Galaburda. "Composite materials based on polyurethane with fragments of poly(vinyl butyral-vinyl acetate-vinyl alcohol) copolymer in their structure filled with silver- and copper-containing silica". Himia, Fizika ta Tehnologia Poverhni 13, n. 3 (30 settembre 2022): 274–88. http://dx.doi.org/10.15407/hftp13.03.274.

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Abstract (sommario):

A series of polymeric composites based on polyurethanes with copolymer fragments of poly(vinyl butyral-vinyl acetate-vinyl alcohol) and 1,6-hexamethylenediamine filled with modified precipitated silica were synthesized. The content of silver in the nanocomposites was 0.1–0.2 and of copper – 0.14 and 0.2 mmol per 1 g of SiO2 (02AgCu; AgCu and 01Ag samples). The content of silver-containing silica filler in the polymer composites was 0.1, 0.5 and 1.0 wt. %. By means of the IR spectroscopy, it has been found that a physical immobilization of modified silica in the polymeric matrix takes place due to the presence of intermolecular hydrogen bonds. The influence of fillers on the structure and properties of polymer materials, in particular, on thermophysical properties and physico-mechanical parameters (tensile strength and relative elongation at rupture), were investigated. The results of physico-mechanical tests indicate that the strength characteristics of polyurethane depend on the content and concentration of fillers. It has been found that the polymeric sample filled with 02AgCu nanocomposite (0.2 mmol of Ag and Cu per 1 g of SiO2) has the highest strength of the rupture. It has been shown that the introduction of modified silica leads to a reduction of relative elongation at rupture of polymeric nanocomposite. The highest values showed the sample filled with AgCu (0.1 and 0.12 mmol Ag and Cu, respectively, per 1 g of SiO2). The introduction of silver-containing silica nanocomposites into a polyurethane, containing polyvinylbutiral copolymer fragments, leads to an increase in tensile strength and reduction of relative elongation at rupture. Polymeric composite with 0.5 wt. % of filler had the highest values of physico-mechanical parameters. It has been shown that the thermosphysical characteristics depend on the concentration and composition of the fillers and have a nonlinear character. The synthesized nanocomposites can be effectively used as biomedical materials.

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Sadeghian, Aida, Mahshid Kharaziha e Maryam Khoroushi. "Osteoconductive visible light-crosslinkable nanocomposite for hard tissue engineering". Colloids and Surfaces A: Physicochemical and Engineering Aspects 632 (gennaio 2022): 127761. http://dx.doi.org/10.1016/j.colsurfa.2021.127761.

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41

Vickers, D., L. A. Archer e T. Floyd-Smith. "Synthesis and characterization of cubic cobalt oxide nanocomposite fluids". Colloids and Surfaces A: Physicochemical and Engineering Aspects 348, n. 1-3 (settembre 2009): 39–44. http://dx.doi.org/10.1016/j.colsurfa.2009.06.025.

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42

Sivudu, K. Samba, e K. Y. Rhee. "Preparation and characterization of pH-responsive hydrogel magnetite nanocomposite". Colloids and Surfaces A: Physicochemical and Engineering Aspects 349, n. 1-3 (ottobre 2009): 29–34. http://dx.doi.org/10.1016/j.colsurfa.2009.07.048.

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43

Gyergyek, Sašo, Darko Makovec, Alenka Mertelj, Miroslav Huskić e Mihael Drofenik. "Superparamagnetic nanocomposite particles synthesized using the mini-emulsion technique". Colloids and Surfaces A: Physicochemical and Engineering Aspects 366, n. 1-3 (agosto 2010): 113–19. http://dx.doi.org/10.1016/j.colsurfa.2010.05.035.

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44

Castaneda-Montes, I., A. W. Ritchie e J. P. S. Badyal. "Atomised spray plasma deposition of hierarchical superhydrophobic nanocomposite surfaces". Colloids and Surfaces A: Physicochemical and Engineering Aspects 558 (dicembre 2018): 192–99. http://dx.doi.org/10.1016/j.colsurfa.2018.08.054.

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45

Du, Zhengshan, Yang Hu, Xiaoyu Gu, Meng Hu e Chaoyang Wang. "Poly(acrylamide) microgel-reinforced poly(acrylamide)/hectorite nanocomposite hydrogels". Colloids and Surfaces A: Physicochemical and Engineering Aspects 489 (gennaio 2016): 1–8. http://dx.doi.org/10.1016/j.colsurfa.2015.09.039.

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46

Fahmy, Alaa. "Silver/Polyethylene Glycol Nanocomposite Thin Films and its Biological Applications". JOURNAL OF ADVANCES IN CHEMISTRY 11, n. 5 (18 aprile 2015): 3597–608. http://dx.doi.org/10.24297/jac.v11i5.4478.

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Abstract (sommario):

The synthesis of silver nanoparticles with different sizes and concentrations was carried out using NaBH4 as a reducing agent and polyethylene glycol (PEG) as a stabilizer. The thin films of PEG embedded with Ag nanoparticles (Ag NPs) were deposited by electrospray deposition technique (ESD) and the morphology of subsequent prepared films was studied by AFM. Structure-property relationships of the colloid and subsequent films were discussed in dependence on the concentration of NaBH4. The synthesized Ag/PEG nanocomposite solution was characterized by UV-visible spectroscopy and Transmission electron microscopy (TEM). Chemical composition in the whole and on the surface of films were investigated by Fourier transform infrared (ATR-IR) and X-ray photoelectron microscopy (XPS), respectively. The UV-visible results indicate to the formation of spherical Ag NPs where the absorption peak was observed at wavelengths around 395 nm. TEM images showed the well dispersion of Ag NPs in the PEG matrix with average particle size of 13 nm. Furthermore, the antimicrobial activity of the nanocmposite was studied. The Ag NPs released from the polymer matrix proven to have a significant antimicrobial activity against S. Pneumonia, B. Subtilis, E. Coli, and A. Fumigates.

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47

Colver, Patrick J., Catheline A. L. Colard e Stefan A. F. Bon. "Multilayered Nanocomposite Polymer Colloids Using Emulsion Polymerization Stabilized by Solid Particles". Journal of the American Chemical Society 130, n. 50 (17 dicembre 2008): 16850–51. http://dx.doi.org/10.1021/ja807242k.

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48

Haraguchi, Kazutoshi. "Stimuli-responsive nanocomposite gels". Colloid and Polymer Science 289, n. 5-6 (25 gennaio 2011): 455–73. http://dx.doi.org/10.1007/s00396-010-2373-9.

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49

Deplace, Fanny, Michael A. Rabjohns, Tetsuo Yamaguchi, Andrew B. Foster, Clara Carelli, Chun-Hong Lei, Keltoum Ouzineb, Joseph L. Keddie, Peter A. Lovell e Costantino Creton. "Deformation and adhesion of a periodic soft–soft nanocomposite designed with structured polymer colloid particles". Soft Matter 5, n. 7 (2009): 1440. http://dx.doi.org/10.1039/b815292f.

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50

Tseng, Kuo-Hsiung, Hsueh-Chien Ku, Hen-Lin Lee, Der-Chi Tien e Leszek Stobinski. "Fabricating Tungsten and Tungsten-Trioxide Nanocomposite Colloid in Deionized Water by Electric Spark Discharge Method". Journal of Cluster Science 30, n. 2 (31 gennaio 2019): 477–82. http://dx.doi.org/10.1007/s10876-019-01511-0.

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