Thematische Bibliographien / Nanocomposite colloid

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Auswahl der wissenschaftlichen Literatur zum Thema „Nanocomposite colloid“

Autor: Grafiati

Veröffentlicht am 12. April 2025

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Zeitschriftenartikel zum Thema "Nanocomposite colloid"

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 und Jae-Do Nam. „MONTMORILLONITE-REINFORCED NATURAL RUBBER NANOCOMPOSITES THROUGH EMULSION STABILIZATION–DESTABILIZATION METHOD“. Rubber Chemistry and Technology 85, Nr. 2 (01.06.2012): 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 und Dyah Puspitasari. „Preparation of Silver-Chitosan Nanocomposites Colloidal and Film as Antibacteri Material“. JKPK (Jurnal Kimia dan Pendidikan Kimia) 5, Nr. 3 (31.12.2020): 300. http://dx.doi.org/10.20961/jkpk.v5i3.46711.

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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, AgNO3 as a precursor and NaOH as an accelerator. This study investigated AgNO3 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 E. Coli and S. Aureus. 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 AgNO3 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 AgNO3 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 E. Coli and S. Aureus.

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Krkljes, Aleksandra, Miodrag Mitric und Zorica Kacarevic-Popovic. „Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values“. Chemical Industry 62, Nr. 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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Li, Bao Guang, Yong Zi Xu, Lu Bai, Huan Dai, Cai Cai Xie und Hai Bin Li. „Ultrasonic Effect on Fabrication of Intercalated MgAl-LDH/PVA Nanocomposites via Exfoliation-Adsorption Route“. Key Engineering Materials 727 (Januar 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 und V. M. SHALAEV. „OPTICAL NONLINEARITIES OF METAL-DIELECTRIC COMPOSITES“. Journal of Nonlinear Optical Physics & Materials 08, Nr. 02 (Juni 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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Mitzscherling, S., Q. Cui, W. Koopman und M. Bargheer. „Dielectric function of two-phase colloid–polymer nanocomposite“. Physical Chemistry Chemical Physics 17, Nr. 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 und Vladimir V. Vinogradov. „Magneto-Optical Modulation on Colloid Cu–Ni Nanocomposite“. Journal of Physical Chemistry C 119, Nr. 3 (12.01.2015): 1500–1505. http://dx.doi.org/10.1021/jp511736f.

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Stojkovska, Jasmina, Jovana Zvicer, Zeljka Jovanovic, Vesna Miskovic-Stankovic und Bojana Obradovic. „Controlled production of alginate nanocomposites with incorporated silver nanoparticles aimed for biomedical applications“. Journal of the Serbian Chemical Society 77, Nr. 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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Vodnik, Vesna V., Dušan K. Božanić, Nataša Bibić, Zoran V. Šaponjić und Jovan M. Nedeljković. „Optical Properties of Shaped Silver Nanoparticles“. Journal of Nanoscience and Nanotechnology 8, Nr. 7 (01.07.2008): 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 und 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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Dissertationen zum Thema "Nanocomposite colloid"

Ma, Huanhuan. „Synthesis of silica/polymer hybrid particles with controlled morphologies through polymerization induced co-assembly of grafted and free block copolymers“. Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10330.

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Les colloïdes nanocomposites organiques/inorganiques suscitent une attention considérable en raison de leur large gamme d'applications potentielles. L'auto-assemblage induit par la polymérisation (PISA) de copolymères à blocs en surface de nanoparticules inorganiques est reconnu comme une stratégie particulièrement efficace pour la synthèse de ces matériaux. Cette étude vise à synthétiser des brosses de polymères hydrophiles à la surface de particules de silice en utilisant la polymérisation radicalaire contrôlée par la voie nitroxyde (NMP) et à les utiliser par la suite comme macroamorceurs pour la croissance d'un second bloc hydrophobe. Des colloïdes hybrides avec des morphologies bien définies sont ainsi obtenus grâce à l'auto-assemblage des copolymères à blocs greffés et de leurs analogues non greffés. La première partie de ce travail est dédiée au greffage de brosses de polyélectrolytes faibles, le poly(acide méthacrylique-co-styrène) (P(AMA-co-S)), à partir de la surface de particules de silice. Des alcoxyamines ont été liées de manière covalente à des particules de silice de tailles variées en deux étapes, et avec une large gamme de densités de greffage. Ces particules de silice modifiées ont ensuite été utilisées comme amorceurs « supportés » pour la NMP de l’acide méthacrylique (AMA) en présence d’une faible quantité de styrène. En faisant varier systématiquement les conditions expérimentales, des particules de silice fonctionnalisées par des brosses de P(AMA-co-S) présentant différentes densités de greffage et différentes masses molaires, ont été obtenues. Leur comportement en solution aqueuse en fonction du pH et de la présence de sel ajouté a ensuite été étudié. Les particules de silice fonctionnalisées par les chaînes de P(AMA-co-S) ont été ensuite utilisées pour amorcer la copolymérisation en émulsion du méthacrylate de méthyle (MMA) et du styrène en présence de macroamorceur non greffé. Les expériences de contrôle effectuées en l’absence de silice ont conduit à la formation de particules de latex sphériques auto-stabilisées par le procédé PISA. L’influence de la concentration en macroamorceur, de sa masse molaire, du taux de solide et de la température sur la cinétique de polymérisation et la taille des particules de latex a été étudié en détails. Lorsque les particules de silice greffées ont été utilisées, l'auto-assemblage des copolymères à blocs amphiphiles à leur surface a conduit à la formation de particules hybrides de type framboise, cœur-coquille ou multicœur, en fonction de la taille des particules de silice, de la concentration en sel, ainsi que de la densité de greffage ou de la masse molaire du macroamorceur utilisé. La troisième partie de ce travail est consacrée à la synthèse par NMP de nano-objets à base de copolymères à blocs de type P(AMA-co-S)-b-P(MABz-co-S) stabilisés stériquement, par polymérisation en dispersion du méthacrylate de benzyle (MABz) en milieu alcoolique. La polymérisation réalisée à 85°C dans l'éthanol absolu est bien contrôlée, et conduit à la formation de particules sphériques, ainsi qu’à des morphologies supérieures telles que des batônnets, des fibres ou des vésicules selon la masse molaire du macroamorceur, de sa concentration et de la teneur en monomère. En présence des particules de silice fonctionnalisées, des morphologies hybrides originales composées de fibres courtes ou de vésicules liées à la surface de la silice ont été obtenues à nouveau par co-assemblage entre les chaînes de copolymères à bloc greffées et les chaînes non greffées. Ainsi, en faisant varier les conditions expérimentales et la nature chimique du monomère hydrophobe, une large gamme de morphologies hybrides a été obtenue à partir des mêmes particules de silice modifiées par des brosses de PAMA
Organic/inorganic nanocomposite colloids are attracting considerable attention due to their diverse range of potential applications. Polymerization-induced self-assembly of block copolymers on the surface of inorganic nanoparticles is recognized as a particularly effective strategy for the synthesis of these materials. This study aims to synthesize hydrophilic polymer brushes on silica particles using nitroxide-mediated radical polymerization (NMP) and subsequently employ them as macroinitiators for the growth of a second hydrophobic block. Hybrid colloids with well-defined morphologies are thus obtained through the co-assembly of surface-grafted and “free” ungrafted block copolymers. The first part of this work explores the grafting of weak polyelectrolyte brushes, namely poly(methacrylic acid-co-styrene) (P(MAA-co-S)), from the surface of silica particles. Alkoxyamine initiators were covalently attached to silica particles of varying sizes in two-steps, resulting in a large range of alkoxyamine grafting densities. These modified silica particles were subsequently employed as initiators for the NMP of MAA in the presence of a small amount of styrene as a controlling comonomer. By systematically varying the experimental conditions, silica particles functionalized with P(MAA-co-S) brushes, with tunable grafting densities and molar masses, were synthesized, and their pH- and salt-responsive behaviors were investigated. The resulting P(MAA-co-S)-functionalized silica particles were then employed in the aqueous emulsion copolymerization of methyl methacrylate (MMA) and styrene in the presence of free macroinitiator. Control experiments conducted without silica produced electrosterically stabilized spherical latex particles via polymerization-induced self-assembly. The effects of macroinitiator concentration, molar mass, solids content, and temperature on the polymerization kinetics and latex particles size were systematically studied. When PMAA-grafted silica particles were used, the co-assembly of the amphiphilic block copolymers on the silica surface and in solution, resulted in hybrid particles with raspberry, core-shell, or multicore morphologies depending on silica particle size, salt concentration, and the grafting density and molecular weight of the macroinitiator. The third part of this work reports the synthesis of sterically stabilized P(MAA-co-S)-b-P(BzMA-co-S) block copolymers nano-objects through alcoholic NMP dispersion polymerization of benzyl methacrylate (BzMA). The polymerization was well-controlled at 85°C in pure ethanol, producing copolymers that not only formed spherical particles but also self-assembled into more complex structures, such as worms and vesicles depending on the molar mass or concentration of the macroinitiator, and monomer content. Upon introducing P(MAA-co-S)-functionalized silica particles into the dispersion polymerization system, co-assembly of grafted and free block copolymers resulted in original hybrid morphologies composed of surface-tethered short worms or vesicles. By modifying the reaction conditions and monomer types, a wide range of nanocomposite colloidal morphologies were achieved using the same polymer brush-modified silica particles

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Balmer, Jennifer Anne. „Colloidal nanocomposite particles of heteroflocculation“. Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531186.

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Gill, Michael. „Polyaniline-silica colloidal nanocomposites“. Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239632.

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The work presented in this thesis provides a new route to a colloidal form of polyaniline, which uses colloidal silica as a dispersant. We obtained stable colloidal dispersions of polyaniline-silica composite particles with a 'raspberry' morphology. Compressed pellets of these particles exhibit solid-state conductivities of 1O-!_10-2 S crrr l, which is approximately 1-2 orders of magnitude lower than that of polyaniline bulk powder. This novel colloidal form of polyaniline has significantly improved processability compared to conventionally synthesised polyaniline. The synthesis and chemical characterisations are presented for various polyaniline-silica colloidal nanocomposites. The quantity of polyaniline incorporated into the nanocomposite particles can be controlled by varying the diameter of the silica dispersant, approximately 20% and 60 % polyaniline content being obtained using 120 nm and 10 nm diameter silica respectively. The average particle size ranges of nanocomposites was found to be 150 to 700 nm and 330 to 560 nm, as determined by transmission electron microscopy (TEM) and disc centrifuge photosedimentometry (DCP) respectively. The nanomorphology and surface composition of the polyanilinesilica particles were determined by small angle X-ray scattering (SAXS) and X-ray photoelectron spectroscopy (XPS) respectively. The average inter-particle separation distance of the silica particles within the polyaniline-silica raspberries was determined by SAXS to be 4 nm, a dimension equivalent to molecular polyaniline. The XPS data suggests that the surface of the particles is silica rich, this is consistant with their long term colloidal stability in 1.2 mole dm-3 HCl. The kinetics of polymerisation was studied using 1H NMR spectroscopy to monitor the disappearance of aniline monomer. Polymerisation rates during the synthesis of polyaniline-silica nanocomposites were appreciably faster than the corresponding precipitation polymerisations carried out in the absence of silica dispersants, due primarily to an increase in the second auto-catalytic step of the reaction. Rate constants were determined for both these types of synthesis; the values obtained for the precipitation polymerisations were in reasonably good agreement with literature values.

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Sun, Yangyang. „Study on the Nanocomposite Underfill for Flip-Chip Application“. Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13975.

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Underfill material is a special colloidal dispersion system with silicon dioxide particles in the organic liquid. It is used to improve the reliability of integrated circuits (IC) packaging in the microelectronics. In order to successfully synthesize the nanocomposite underfill meeting the requirements of the chip package, it is necessary to have a fundamental understanding about the particle stability in the non-aqueous liquid and the relationship between materials properties and interphase structure in the composite. The results of this thesis contribute to the knowledge of colloidal dispersion of nanoparticles in organic liquid by systematically investigating the effects of particle size, particle surface chemistry and surface tension, and liquid medium polarity upon the rheological and thermal mechanical properties of underfill materials. The relaxation and dielectric properties studies indicate that the polymer molecular chain motion and polarization in the interphase region can strongly influence the material properties of nanocomposite, and so a good interaction between particle and polymer matrix is key. With this study, a potential nanocomposite underfill can be synthesized with low viscosity, low thermal expansion, and high glass transition temperature. The excellent transmittance of nanoparticles leads to further investigation of their ability as reinforcing filler in the photo-curable polymer.

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Fielding, Lee A. „Synthesis, characterisation and applications of colloidal nanocomposite particles“. Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/2859/.

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Paul, Anita N. „Silver-Polymer Nanocomposites“. Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3077.

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The objective of this research was the development of an efficient method for the preparation of silver-polymer nanocomposites containing finely dispersed silver nanoparticles. The surface of nanosilver was functionalized by thiolation with 2-aminoethanethiol. Amino-modified nanosilver was covalently bonded to polyacrylic acid, biodegradable polymers like acid terminated polylactic acid, ester terminated poly(DL-lactide-co-glycolide) and acid terminated poly(DL lactide-co-glycolide) in the presence of diisopropylcarbodiimide by carbodiimide method. Esterification of the carboxyl groups of Ag-polyacrylic acid by hydrochloric acid in methanol resulted in the formation of a stable colloidal dispersion of Ag nanoparticles in the polymer matrix. It was observed that not just acid terminated polymers but also ester terminated polymers could react with functionalized nanosilver. This unusual reaction was due to the aminolysis of the ester bond in the polymer chain by the surface amino groups. Silver-polymer nanocomposites obtained with acid terminated polylactic acid and poly(DL-lactide-co-glycolide) contained highly dispersed nanosilver in the polymer matrix in comparison with the ester terminated poly(DL-lactide-co-glycolide). Chemical and structural characteristics of the obtained materials were studied by instrumental methods. Attained biodegradable materials confirmed X-ray contrast and bactericidal properties, which could be eventually used for biomedical applications.

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Sun, Zhengfei Wei Yen. „Novel sol-gel nanoporous materials, nanocomposites and their applications in bioscience /“. Philadelphia, Pa. : Drexel University, 2005. http://dspace.library.drexel.edu/handle/1860/556.

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Доброжан, Олександр Анатолійович, Александр Анатольевич Доброжан, Oleksandr Anatoliiovych Dobrozhan, Анатолій Сергійович Опанасюк, Анатолий Сергеевич Опанасюк, Anatolii Serhiiovych Opanasiuk, Денис Ігорович Курбатов et al. „Thermoelectric properties of the colloidal Bi2S3-based nanocomposites“. Thesis, Jadavpur University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65347.

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In this work we present the proof of the concept of the novel strategy to improve the thermoelectric properties of Bi2S3based nanostructured bulk materials by blending the metallic nanoinclustions with the semiconductor nanoparticles forming the nanocomposites (NCts). The obtained NCts were composed of Bi2S3nanorods (length - 100 nm and width – 10 nm) and Ag nanoparticles (diameter - 2- 3 nm) synthesized by colloidal method. The morpohology, phase and chemical composition, electrical conductivity and Seebeck coefficient of NCts were investigated by using transmission electron microscopy (TEM), X-ray diffraction, energy dispersive X-ray analysis (EDAX), 4-point probes method and static dc-method. This strategy is the perspective way to improve the conversion efficiency of others thermoelectric materials.

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Wang, Tao. „Interfacial control in colloidal nanocomposites for pressure-sensitive adhesives“. Thesis, University of Surrey, 2008. http://epubs.surrey.ac.uk/882/.

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This work developed various two-phase colloidal nanomaterials from aqueous dispersions and applied them as pressure-sensitive adhesives. A fundamental understanding of the nano-scale interfacial friction and the macro-scale viscoelasticity and adhesive properties of these nanomaterials was developed via various existing models.

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TRIPALDI, LAURA. „Self-Assembly of Nanoparticles in Rubber Nanocomposites“. Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/381184.

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Le nanoparticelle (NP) di SiO2 sono note per migliorare le proprietà meccaniche e funzionali dei materiali nanocompositi (NC) e sono ampiamente utilizzate come filler di rinforzo negli pneumatici. Le proprietà dei NC dipendono dalla distribuzione delle NP di filler, che a sua volta dipende dalla morfologia e dalla chimica superficiale delle NP. La dispersione di SiO2 NPs idrofiliche in matrici polimeriche è tipicamente ottenuta tramite funzionalizzazione con silani a catena corta. Mentre le NP anisotropiche sono note per auto-organizzarsi in strutture ordinate, producendo migliori proprietà meccaniche nei NC elastomerici, è stato dimostrato che anche le NP sferiche di SiO2 ricoperte con catene di oligomeri, ovvero le SiO2 Hairy NP (SiO2 HNP), possono migliorare la compatibilizzazione filler/matrice mentre si auto-organizzano in superstrutture anisotropiche. Tuttavia, la sintesi di SiO2 HNP con gusci elastomerici è ancora largamente inesplorata, e la relazione tra l'auto-organizzazione delle HNP e le proprietà meccaniche dei NC deve ancora essere del tutto compresa. In questo contesto, lo scopo di questa tesi è stato quello di i) sviluppare una sintesi efficiente di SiO2 HNPs con dimensioni, morfologia e chimica di superficie controllate; ii) preparare NC elastomerici basati su SiO2 HNP con rinforzo migliorato e isteresi ridotta; iii) valutare gli effetti dell'auto-organizzazione sulle prestazioni meccaniche dei materiali e iv) studiare le interazioni tra SiO2 HNPs per determinare quali parametri controllano i processi di auto-organizzazione. Durante il primo anno di attività di dottorato è stata ottimizzata la sintesi di SiO2 HNP funzionalizzate con polibutadiene (PB) con un approccio colloidale. La sintesi ha garantito un eccellente controllo della morfologia e della chimica di superficie delle HNPs. Le particelle non funzionalizzate e funzionalizzate sono state completamente caratterizzate con una pletora di metodi morfologici e fisico-chimici mostrando evidenza di auto-organizzazione. Durante il secondo anno, le SiO2 HNP sono state utilizzate per preparare NC elastomerici in una formulazione industriale. Le proprietà meccaniche dei NC vulcanizzati e non vulcanizzati sono state caratterizzate da analisi dinamico-meccaniche e prove di trazione, mostrando che le HNP migliorano fortemente il rinforzo riducendo la dissipazione di energia, evidenziando migliori interazioni filler/matrice rispetto alle NP SiO2 non funzionalizzate e funzionalizzate con silano. La caratterizzazione morfologica delle NC ha confermato il miglioramento della dispersione e della distribuzione del filler con l'aumento della funzionalizzazione con PB e ha mostrato l'auto-organizzazione delle HNP in sovrastrutture anisotropiche simili a stringhe. Durante il terzo anno, il modello delle HNP è stato adattato a una formulazione riproducibile su scala industriale usando un silano macromolecolare a base di PB (MacroSil) e silice commerciale. Le proprietà meccaniche degli NC elastomerici sono state caratterizzate in modo approfondito con analisi meccaniche dinamiche, prove di trazione e analisi Large Amplitude Oscillatory Shear (LAOS), dimostrando che l'aggiunta di MacroSil migliora significativamente le prestazioni meccaniche degli NC rispetto a un silano a catena corta. Infine, esperimenti di Small-Angle X-Ray Scattering (SAXS) sulle dispersioni di SiO2 HNPs in collaborazione con il Prof. Simone Mascotto dell'Università di Amburgo hanno fornito parametri strutturali fondamentali che sono stati utilizzati per formulare un modello teorico delle interazioni tra HNP, in collaborazione con il Prof. Arturo Moncho dell'Università di Granada e il Prof. Gerardo Odriozola della UAM-Azcapotzalco. Il modello teorico ha predetto la formazione delle sovrastrutture anisotropiche di SiO2 HNP osservate sia nelle particelle prive di matrice sia nei NC elastomerici.
SiO2 nanoparticles (NPs) are known to improve the mechanical and functional properties of nanocomposite (NC) materials and are widely used as reinforcing fillers in tyres. The properties of NCs depend on the distribution of filler NPs, which in turn depends on the morphology and surface chemistry of filler NPs. The dispersion of hydrophilic SiO2 NPs in polymer matrices is typically achieved by functionalization with short-chain silanes. While anisotropic NPs are known to self-organize in ordered structures, producing improved mechanical properties in rubber NCs, evidence has shown that also spherical SiO2 NPs grafted with oligomer chains, i.e. SiO2 Hairy NPs (SiO2 HNPs), can improve filler/matrix compatibilization while self-organizing in anisotropic superstructures. However, the synthesis of SiO2 HNPs with rubbery shells is still largely unexplored, and the relationship between HNPs self-assembly and the mechanical properties of NCs is yet to be understood. In this context, the aim of this thesis was i) to develp an efficient synthesis of SiO2 HNPs with tunable size, controlled morphology and tailored surface chemistry; ii) to prepare rubber NCs based on SiO2 HNPs with improved reinforcement and reduced hysteresis; iii) to assess the self-assembly effects on the mechanical performance of the materials and iv) to study the interactions between SiO2 HNPs in order to determine which parameters control the self-assembly processes. During the first year of PhD activity the synthesis of polybutadiene (PB)-grafted SiO2 HNPs by a colloidal approach was optimized. The synthesis granted excellent control of HNPs morphology and surface chemistry. The bare and functionalized particles were fully characterized by a plethora of morphological and physico-chemical methods showing evidence of self-assembly. During the second year, SiO2 HNPs were used to prepare rubber NCs in an industrial formulation. The mechanical properties of the cured and uncured NCs were characterized by dynamic-mechanical analysis and tensile tests, showing that HNPs strongly improve reinforcement while reducing energy dissipation, highlighting improved filler/matrix interactions compared to both bare and silane-functionalized SiO2 NPs. Morphological characterization of the NCs confirmed the improvement of filler dispersion and distribution with increased PB functionalization and showed the self-organization of HNPs in anisotropic string-like superstructures. During the third year, the HNPs model was adapted to a scalable industrial rubber formulation using a PB macromolecular silane (MacroSil) and commercial precipitated silica. The mechanical properties of the rubber NCs were thoroughly characterized with dynamic mechanical analysis, tensile tests and Large Amplitude Oscillatory Shear (LAOS) analysis, showing that the addition of MacroSil significantly improves the mechanical performance of NCs compared to a short-chain silane. Finally, Small-Angle X-Ray Scattering of SiO2 HNPs dispersions in collaboration with Prof. Simone Mascotto at Hamburg University provided crucial structural parameters which were used to formulate a theoretical model of HNPs interactions, in collaboration with Prof. Arturo Moncho of the University of Granada and Prof. Gerardo Odriozola of UAM-Azcapotzalco. The theoretical model predicted the formation of the SiO2 HNPs anisotropic superstructures observed both in matrix free conditions and rubber NCs.

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Bücher zum Thema "Nanocomposite colloid"

Bouzid, Menaa, Hrsg. Bioencapsulation in silica-based nanoporous sol-gel glasses. Hauppauge, N.Y: Nova Science Publishers, 2009.

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Lee, B., N. A. Peppas, J. Kim, J. Y. Chang, D. Y. Godovsky, M. J. Han, C. M. Hassan, Y. Lee, R. P. Quirk und T. Yoo. Biopolymers - Pva Hydrogels Anionic Polymerisation Nanocomposites. Springer, 2013.

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(Contributor), J. Y. Chang, D. Y. Godovsky (Contributor), M. J. Han (Contributor), C. M. Hassan (Contributor), J. Kim (Contributor), B. Lee (Contributor), Y. Lee (Contributor), N. A. Peppas (Contributor), R. P. Quirk (Contributor) und T. Yoo (Contributor), Hrsg. Biopolymers/PVA Hydrogels/Anionic Polymerisation/ Nanocomposites (Advances in Polymer Science). Springer, 2000.

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Capek, Ignac. Nanocomposite structures and dispersions, Volume 23 (Studies in Interface Science). Elsevier Science, 2006.

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Kickelbick, Guido, Massimo Guglielmi und Alessandro Martucci. Sol-Gel Nanocomposites. Springer, 2014.

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Kickelbick, Guido, Massimo Guglielmi und Alessandro Martucci. Sol-Gel Nanocomposites. Springer, 2016.

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Sol-Gel Nanocomposites. Springer, 2014.

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Nanocomposite Structures and Dispersions - Science and Nanotechnology - Fundamental Principles and Colloidal Particles. Elsevier, 2006. http://dx.doi.org/10.1016/s1383-7303(06)x8001-8.

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Nanocomposite structures and dispersions: Science and nanotechnology--fundamental principles and colloidal particles. Amsterdam: Elsevier, 2006.

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Buchteile zum Thema "Nanocomposite colloid"

Oberdisse, J., und F. Boué. „Rheology–structure relationship of a model nanocomposite material“. In Trends in Colloid and Interface Science XVII, 124–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b94023.

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Ghosh, G., A. Vílchez, J. Esquena, C. Solans und C. Rodríguez-Abreu. „Preparation of Porous Magnetic Nanocomposite Materials Using Highly Concentrated Emulsions as Templates“. In Trends in Colloid and Interface Science XXIV, 161–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19038-4_29.

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Oliveira, M. M., D. Zanchet, D. Ugarte und A. J. G. Zarbin. „Synthesis and characterization of silver nanoparticle/polyaniline nanocomposites“. In Surface and Colloid Science, 126–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b97108.

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Jana, Nikhil Ranjan. „Gold Nanorod-Based Different Nanocomposites“. In Colloidal Gold Nanorods, 31–44. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003245339-3.

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Mittal, Vikas. „Characterization of Polymer Nanocomposite Colloids by Sedimentation Analysis“. In Characterization Techniques for Polymer Nanocomposites, 303–21. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527654505.ch12.

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Ingrosso, Chiara, Marinella Striccoli, Angela Agostiano und Maria Lucia Curri. „Surface-Functionalized Inorganic Colloidal Nanocrystals in Functional Nanocomposite Materials for Microfabrication“. In Molecules at Work, 263–83. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527645787.ch12.

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Hu, Sheng, und Dibyendu Mukherjee. „Colloidal Synthesis of Advanced Functional Nanostructured Composites and Alloys via Laser Ablation-Based Techniques“. In Multifunctional Nanocomposites for Energy and Environmental Applications, 135–72. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527342501.ch7.

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Belamie, Emmanuel, und Bruno Alonso. „Hybrid Nanocomposites Through Colloidal Interactions Between Crystalline Polysaccharide Nanoparticles and Oxide Precursors“. In Handbook of Sol-Gel Science and Technology, 1–39. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-19454-7_120-1.

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Belamie, Emmanuel, und Bruno Alonso. „Hybrid Nanocomposites Through Colloidal Interactions Between Crystalline Polysaccharide Nanoparticles and Oxide Precursors“. In Handbook of Sol-Gel Science and Technology, 3213–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-32101-1_120.

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Kamysbayev, Vladislav, Nicole M. James, Alexander S. Filatov, Vishwas Srivastava, Babak Anasori, Heinrich M. Jaeger, Yury Gogotsi und Dmitri V. Talapin. „Colloidal Gelation in Liquid Metals Enables Functional Nanocomposites of 2D Metal Carbides (MXenes) and Lightweight Metals“. In MXenes, 625–52. New York: Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003306511-31.

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Konferenzberichte zum Thema "Nanocomposite colloid"

Azouri, Assaf, Ming Ge, Kun Xun, Klaus Sattler, Joe Lichwa und Chittaranjan Ray. „Zeta Potential Studies of Titanium Dioxide and Silver Nanoparticle Composites in Water-Based Colloidal Suspension“. In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17072.

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We determine the zeta potential (ZP) by using electrophoretic laser light scattering and Laser Doppler Velocimetry (LDV). Particle sizes are measured by photon correlation spectroscopy (PCS). We studied the ZP for colloidal suspensions of TiO2 and Ag metal particles in order to determine the kinetic interaction and charge exchange between the particles. We investigated the natural tendency of the particles for aggregation and varied the pH of the solution. It was found that the ZP versus pH curve for the mixed TiO2/Ag did not behave as the average of the individual TiO2 and Ag curves as one would expect, and instead there was a slight horizontal shift towards higher pH values which implies that the particles in the mixed TiO2/Ag colloid are interacting with the result of charge exchange. The average particle size was measured in terms of effective diameter, for the TiO2, Ag and the mixed TiO2/Ag particles. The results indicated an increase of approximately 100 nm in the effective diameter of the mixed TiO2/Ag particles size compared to the size of the individual TiO2 particles. This can be explained as the fact that 50 nm Ag particles are adsorbed on the surface of the TiO2 particles.

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Kostic, Milivoje M. „Critical Issues and Application Potentials in Nanofluids Research“. In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17036.

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Development of many industrial and new technologies is limited by existing thermal management, and need for high-performance cooling. Nanofluids, stable colloidal mixtures of nanoparticles (including nanofibers and functional nanocomposites) in common fluids, have a potential to meet these and many other challenges. Colloidal nano-mixtures with functionally-stable and active-like nanostructures that may self-adjust to the process conditions, require systematic surface-chemistry study and enhancements (coatings with functional layers, surfactants, etc), in addition to investigation of thermo-physical characteristics and phenomena. A comprehensive, systematic and interdisciplinary experimental research program is necessary to study, understand and resolve critical issues in nanofluids research to date. The research must focus on both synthesis and a careful exploration of thermo-physical characteristics. Development of new-hybrid, drag-reducing nanofluids may lead to enhanced flow and heat transfer characteristics. The nanoparticles in these fluids yield increased heat-transfer while the long-chain polymers are expected to enhance flow properties, including active and functional interactions with nanoparticles, thus providing potential for many applications yet to be developed and optimized.

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Gordillo, H., I. Suárez, P. Rodríguez-Cantó, R. Abargues, R. García-Calzada, V. Chyrvony, S. Albert und J. Martínez-Pastor. „Colloidal QDs-polymer nanocomposites“. In SPIE Photonics Europe. SPIE, 2012. http://dx.doi.org/10.1117/12.921838.

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Azouri, Assaf, Ming Ge, Kun Xun, Klaus Sattler, Joe Lichwa und Chittaranjan Ray. „Colloidal Stability of Nanosoil/Nanofiber Aqueous Suspensions From Natural Environment in Hawaii“. In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17074.

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Nanoparticles from iron-oxide rich soil and nanofibers from bark of the plumeria tree in Hawaii have been studied using photon correlation spectroscopy (PCS). Particles with sizes of several hundred nanometers have been investigated in aqueous suspension. The zeta potentials have been determined as a function of pH for soil, fiber, and the soil/fiber mixture. It is found that all three suspensions have negative zeta potentials and no isoelectric point within the pH range from 4 to 11. This shows that the suspensions are stable over a wide range of conditions. Both soil and fiber samples have approximately constant zeta potentials within this range. However, the zeta potential changes significantly for the nanosoil/nanofiber mixture when the pH is varied. We conclude that the nanoparticles of soil and fiber interact in the suspension and that this depends on the pH value of the suspension.

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Viorica, Railean, Anna Król-Górniak, Pomastowski Pawel und Buszewski Boguslaw. „New Consideration in Achievement of (Bio) Colloid Nanocomposites“. In The 7th World Congress on Recent Advances in Nanotechnology. Avestia Publishing, 2022. http://dx.doi.org/10.11159/icnnfc22.176.

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Sun, Jingyu, Shang Wang und Hongjun Wang. „Hollow porous platinum-based nanocomposite for combined tumor therapy (Conference Presentation)“. In Colloidal Nanoparticles for Biomedical Applications XVIII, herausgegeben von Marek Osiński und Antonios G. Kanaras. SPIE, 2023. http://dx.doi.org/10.1117/12.2651012.

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Anderson, Benjamin J., Charles F. Zukoski, Michio Tokuyama, Irwin Oppenheim und Hideya Nishiyama. „Colloidal Glass Formation in Polymer Nanocomposites“. In COMPLEX SYSTEMS: 5th International Workshop on Complex Systems. AIP, 2008. http://dx.doi.org/10.1063/1.2897784.

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Maeda, S., und S. P. Annes. „Polypyrrole-tin (IV) oxide colloidal nanocomposites“. In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.836033.

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Milošević, Milica. „Hybrid functional Pani/TiO2 nanocomposites for dyes degradation treatment“. In 36th International Congress on process engineering. SMEITS, 2023. http://dx.doi.org/10.24094/ptk.023.083.

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A calling need for environmental protection is not abating and high demands have been set for the current topic that deals with applied technologies for removal of organic pollutants. The AOPs appear to be one of the most effective processes, where heterogeneous photocatalysis using efficient UV light-harvesting TiO2 nanocrystals has unquestionably become one of the most commonly used process for dyes degradation treatment. Limited photocatalytic efficiency of TiO2 under sunlight illumination was overcame by coupling with polyaniline (PANI) as notably investigated conductive polymer. Reducing the level of e-/h+ recombination in TiO2 and photosensitized properties of PANI was the basis for creation of new functional PANI/TiO2 nanocomposites. Such hybrid functional nanomaterials consisting of conductive polymers and dissimilar nanocrystals manifest the unique properties, usually not characteristic of independent components but their synergistic effect. Series of developed functional nanocomposites based on PANI and colloidal TiO2 nanoparticles (NPs) (TP), carbonized PANI and colloidal TiO2 NPs (TPC) and carbonized PANI and TiO2 nanotubes (NTs) (TTPC) by the efficient and harmless synthesis pathways are presented. Differently shaped TiO2 nanocrystals are carefully prepared via sol-gel and hydrothermal synthesis and the influence of their size and shape on the photocatalytic efficiency of hybrid nanocomposites was evaluated. The non-carbonized PANI/TiO2 nanocomposites were synthesized by the chemical oxidative polymerization of aniline with ammonium peroxydisulfate, in the presence of selected TiO2 nanocrystals, while the carbonized class was obtained in the subsequent carbonization process, following the polymerization, in an inert atmosphere at 650 °C. The morphology and structure of these nano-based photocatalysts was determined by TEM analysis and Raman spectroscopy. Functionality of nanocomposites was evaluated following the photocatalytic degradation processes of model compounds Methylene blue and Rhodamine B and enhanced degradation efficiencies in the used dyes were observed.

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Yehia, Ahmed, Ayman A. El-Midani, Suzan S. Ibrahim und Jan D. Miller. „Nano-Interfacial Chemistry of Waste Paper Deinking Processes Using Fatty Ethoxylates“. In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47005.

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The forces affecting the ink particles attachment to the paper substrates control the inking and deinking processes. In deinking process, the detachment of ink particles represents a big challenge due to the presence of nano-sized ink particles which can not be separated by conventional means, therefore, it needs special type of treatment to adapt the chemistry of the surrounding solution to control the interfacial forces to separate the ink particle and make their detachment easier. Although studies have been made to correlate chemical structure of fatty alcohol ethoxylates with the efficiency of ink removal, there is still a significant lack of fundamental knowledge regarding the influence of the ethoxylate alcohol on the interaction forces between particulates involved in the deinking process. In this research, fundamental study of the effect of nano-sized ethoxylated alcohol molecules, which exhibits high potential for application in wastepaper deinking, on the ink particle detachment due to changes in the interfacial forces will be studied. In addition, the ability of ethoxylated alcohol to produce nano-size bubbles will be tested in terms of their effect on the ink particle removal. Furthermore, relationship between molecular structure of ethoxylated fatty alcohols (length and ratio of hydrophobic and hydrophilic parts) and ink (toner) will be characterized using atomic force microscopy (AFM) colloidal probe technique.

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