Gotowe bibliografie tematyczne / Nanoparticles polymer nanocomposites

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Gotowa bibliografia na temat „Nanoparticles polymer nanocomposites”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Nanoparticles polymer nanocomposites"

Montes, Sarah, Hans Grande, Agustín Etxeberria i Jose A. Pomposo. "Miscibility Enhancement in All-Polymer Nanocomposites Composed of Weakly-Charged Flexible Chains and Polar Nanoparticles". Journal of Nano Research 6 (czerwiec 2009): 123–32. http://dx.doi.org/10.4028/www.scientific.net/jnanor.6.123.

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We report the phase behavior of nanocomposites composed of weakly-charged flexible polymers and polar nanoparticles by extending a mean-field theory for all-polymer nanocomposites recently introduced (Journal of Nano Research 2 (2008) 105). Translational, nanoparticle-driven, electrostatic and enthalpic interaction effects are taken into account. Weakly-charged polymers are predicted to be miscible with polar nanoparticles about one order of magnitude larger (in radius) than conventional uncharged polymers, even in the presence of moderate unfavorable enthalpic interactions. The detrimental effect of addition of a low molecular weight monovalent 1-1 salt on nanocomposite miscibility is also evaluated.

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Sabo, Y. T., D. E. Boryo, I. Y. Chindo i A. I. Habib. "Nanocomposites Transformed from Polystyrene Waste/Antimony, Barium and Nickel Oxides Nanoparticles with Improved Mechanical Properties". Journal of Applied Sciences and Environmental Management 25, nr 11 (10.02.2022): 1921–25. http://dx.doi.org/10.4314/jasem.v25i11.11.

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In this experiment, the oxide nanoparticles were synthesized via chemical precipitation and the nanocomposites were produced using in situ polymerization method with varying nanoparticles contents ranged from 0 to 5 g. The mechanical properties of the nanocomposites were investigated and compared with the values obtained for untreated polystyrene. It was observed that the mechanical properties were higher for the nanocomposites and increase with increasing nanoparticle concentrations in the samples. It can be observed that the untreated polystyrene gave a tensile strength of 945.25 N/mm2. At high nanoparticle content of 5 g, the nanocomposite containing NiO nanoparticles showed a tensile strength of 973.83 N/mm2 while nanocomposite containing BaO nanoparticles gave a tensile strength of 968.19 N/mm2 and nanocomposite containing Sb2O3 nanoparticle gave a tensile strength of 955.53 N/mm2. The results indicate that the tensile strength and percentage elongation of all the nanocomposites improved with the addition of metal oxides nanoparticles compared with the untreated polystyrene. Slight decrease in percentage reduction in area of the nanocomposites was recorded. Conclusively, with these results, the PS/NiO nano composite showed a better trend of behaviour due to better interfacial interaction between the nanofillers and the polymer matrix followed by PS/BaO and PS/Sb2O3 nanocomposites. It is recommended that during the production of polymer nanocomposite, PS/NiO, PS/BaO and PS/Sb2O3 nanocomposites could be used as reinforcements in the construction of buildings to add structural stability to the building.

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Mohammed, K. J. "Study the effect of CaCO3 nanoparticles on physical properties of biopolymer blend". Iraqi Journal of Physics (IJP) 16, nr 39 (5.01.2019): 11–22. http://dx.doi.org/10.30723/ijp.v16i39.97.

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Chitosan (CH) / Poly (1-vinylpyrrolidone-co-vinyl acetate) (PVP-co-VAc) blend (1:1) and nanocomposites reinforced with CaCO3 nanoparticles were prepared by solution casting method. FTIR analysis, tensile strength, Elongation, Young modulus, Thermal conductivity, water absorption and Antibacterial properties were studied for blend and nanocomposites. The tensile results show that the tensile strength and Young’s modulus of the nanocomposites were enhanced compared with polymer blend [CH/(PVP-co-VAc)] film. The mechanical properties of the polymer blend were improved by the addition of CaCO3 with significant increases in Young’s modulus (from 1787 MPa to ~7238 MPa) and tensile strength (from 47.87 MPa to 79.75 MPa). Strong interfacial bonding between the CaCO3 nanoparticles and the [CH/(PVP-co-VAc)), homogenous distribution of the nanoparticles in the polymer blend, are assistance of noticeably raised mechanical durability. The thermal conductivity of the polymer blend and CaCO3 nanocomposite films show that it decreased in the adding of nanoparticle CaCO3. The solvability measurements display that the nanocomposite has promoted water resistance. The weight gain lowered with the increase of nano CaCO3. Blending chitosan CH with (PVP-co-VAc) enhanced strength and young modules of the nanocomposites and increased the absorption of water because hydrophilic of the blended polymers films. The effect of two types of positive S.aurous and negative E. coli was studied. The results showed that the nanocomposites were effective for both types, where the activity value ranged from (12 ~ 21). The best results were found for S.aurous bacteria.

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Hassanzadeh-Aghdam, Mohammad Kazem, i Mohammad Javad Mahmoodi. "Micromechanics-based characterization of elastic properties of shape memory polymer nanocomposites containing SiO2 nanoparticles". Journal of Intelligent Material Systems and Structures 29, nr 11 (23.04.2018): 2392–405. http://dx.doi.org/10.1177/1045389x18770862.

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In this article, a unit cell micromechanics model is developed to predict the elastic properties of shape memory polymer nanocomposites containing silica (SiO2) nanoparticles. The model incorporates an interphase zone corresponding to a perturbed region of shape memory polymer matrix around SiO2 nanoparticles. It is found that the elastic properties of shape memory polymer nanocomposites are significantly sensitive to the temperature in the presence of interphase region. As the temperature increases, the shape memory polymer nanocomposite elastic modulus decreases, while the normalized elastic modulus nonlinearly rises. The results reveal that Poisson’s ratio decreases nonlinearly with the increase of temperature. The shape memory polymer nanocomposite mechanical properties are significantly influenced by the nanoparticle diameter in the presence of interphase region. Substantial improvement in normalized elastic modulus is observed with reducing the nanoparticle diameter. Also, a nonlinear decrease in Poisson’s ratio is found as the nanoparticle diameter decreases. Furthermore, the role of nanoparticle diameter becomes more prominent due to enhancement of temperature. The results indicate that with increasing SiO2 nanoparticles’ volume fraction, the elastic modulus of shape memory polymer nanocomposite nonlinearly rises, while Poisson’s ratio decreases. Finally, it is shown that the increase of interphase thickness leads to the enhancement of normalized elastic modulus of shape memory polymer nanocomposite.

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Nasar, Gulfam, Hazrat Amin, Fawad Ahmad i Shahbaz Nazir. "Structural and Thermal Behavior Evaluation of Ag-PVA Nanocomposites Synthesized via Chemical Reduction Technique". Journal of Materials and Physical Sciences 1, nr 1 (30.06.2020): 19–25. http://dx.doi.org/10.52131/jmps.2020.0101.0003.

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Silver nanoparticles were prepared via process of chemical reduction using sodium borohydride as reductant. The prepared nanoparticles were then utilized for synthesizing various compositions of nanocomposites with polymeric matrix of poly (vinyl alcohol). For doing so, the nanoparticles were dispersed in the polymer solution by vigorous stirring. The solutions of the nanocomposites were cast in films. The nanocomposite films were used for various characterization techniques; out of which three are being reported in this communication; XRD, TGA/DTA and SEM. The upshot of XRD proposes a semi-crystalline nature of synthesized nanocomposite. The crystalline character of the nanocomposite enhances with an increasing doping concentration of the prepared nanoparticles. Thermal analysis suggests the degradation pattern of the polymer nanocomposite material and represents that thermal stability improves as the silver nanoparticles are added. The SEM micrograph reveals a uniform surface with a well dispersed nanoparticle in the polymer matrix.

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Lakshmi, Augustine, Athisayaraj Emi Princess Prasanna i Chinnapiyan Vedhi. "Synthesis, Characterisation and Capacitive Behaviour of Poly(3,4-ethylenedioxythiophene)-Copper Oxide Nanocomposites". Advanced Materials Research 678 (marzec 2013): 273–77. http://dx.doi.org/10.4028/www.scientific.net/amr.678.273.

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Nano particles of Copper oxide and Poly(3,4-ethylenedioxythiophene)-Copper oxide nanocomposite were prepared by chemical oxidation method. The formed metal oxide nanoparticle and polymer metal oxide nanocomposites were characterized by UV–VIS, XRD, SEM and EIS studies. The UV-VIS studies of nanoparticles and nanocomposites exhibited four peaks, two peaks are sharp and centered at 280nm and 360 nm while the other two were broaden waves obtained at 780nm and 985nm. SEM image of copper oxide nanoparticles and nanocomposite exhibits sponge-like morphologies, in addition to nanospheres, nanowires, and nanotube shapes. The grain size of the metal oxide nanoparticle and polymer metaloxide nanocomposites was calculated using Scherrer’s formula. Electrochemical impedance spectroscopy (EIS) studies revealed the high conductivity nature due to the increased surface area of the nanocomposites.

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Kausar, Ayesha, Ishaq Ahmad, Tingkai Zhao, Osamah Aldaghri, Khalid H. Ibnaouf i M. H. Eisa. "Multifunctional Polymeric Nanocomposites for Sensing Applications—Design, Features, and Technical Advancements". Crystals 13, nr 7 (22.07.2023): 1144. http://dx.doi.org/10.3390/cryst13071144.

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Among nanocomposite materials, multifunctional polymer nanocomposites have prompted important innovations in the field of sensing technology. Polymer-based nanocomposites have been successfully utilized to design high-tech sensors. Thus, conductive, thermoplast, or elastomeric, as well as natural polymers have been applied. Carbon nanoparticles as well as inorganic nanoparticles, such as metal nanoparticles or metal oxides, have reinforced polymer matrices for sensor fabrication. The sensing features and performances rely on the interactions between the nanocomposites and analytes like gases, ions, chemicals, biological species, and others. The multifunctional nanocomposite-derived sensors possess superior durability, electrical conductivity, sensitivity, selectivity, and responsiveness, compared with neat polymers and other nanomaterials. Due to the importance of polymeric nanocomposite for sensors, this novel overview has been expanded, focusing on nanocomposites based on conductive/non-conductive polymers filled with the nanocarbon/inorganic nanofillers. To the best of our knowledge, this article is innovative in its framework and the literature covered regarding the design, features, physical properties, and the sensing potential of multifunctional nanomaterials. Explicitly, the nanocomposites have been assessed for their strain-sensing, gas-sensing, bio-sensing, and chemical-sensing applications. Here, analyte recognition by nanocomposite sensors have been found to rely on factors such as nanocomposite design, polymer type, nanofiller type, nanofiller content, matrix–nanofiller interactions, interface effects, and processing method used. In addition, the interactions between a nanocomposite and analyte molecules are defined by high sensitivity, selectivity, and response time, as well as the sensing mechanism of the sensors. All these factors have led to the high-tech sensing applications of advanced nanocomposite-based sensors. In the future, comprehensive attempts regarding the innovative design, sensing mechanism, and the performance of progressive multifunctional nanocomposites may lead to better the strain-sensing, gas/ion-sensing, and chemical-sensing of analyte species for technical purposes.

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Ramazanov, M. A., A. M. Rahimli i F. V. Hajiyeva. "The influence of titanium dioxide (TiO2) nanoparticles on the structure, optical and dielectric properties of polyvinyl chloride (PVC)". Modern Physics Letters B 34, nr 28 (10.06.2020): 2050310. http://dx.doi.org/10.1142/s0217984920503108.

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The tendency to improve the properties of insulating materials by incorporating inorganic nanoparticles has become necessary in order to design new insulation systems. In this study, PVC/TiO2-based nanocomposites with different loadings (3, 5 and 10 wt.%) of TiO2 nanoparticles were prepared by the solution mixing method. The morphology of the prepared nanocomposites was studied by Atomic Force Microscope (AFM). Experimentally, it was found that as the concentration increases, the size of the surface structural elements and particle size increases. Photoluminescence (PL) analysis of samples shows improvement compared to the pristine polymer. Furthermore, PL intensity for nanocomposites increases depending on the concentration and saturation occurs at a certain amount of titanium dioxide nanoparticles. The increase in luminescence intensity till a certain nanoparticle content is due to the growth of the luminescent surface area. Further saturation is explained by the increase in particle size with no increase or a slight reduction in surface area. Dielectric properties of nanocomposites were studied. It was found that dielectric permittivity of the materials increases as the nanoparticle volume content increases and it reaches at its highest value for the nanocomposites with 3% nanoparticle content. The optical properties of the polymer and nanocomposite films were studied in the region 200 nm to 600 nm. It was found that the PVC/TiO2 nanocomposites showed enhancement in the absorbance intensities which was more significant for the nanocomposites with higher nanoparticle content compared to the pristine polymer. Furthermore, absorption spectra were used to calculate the optical bandgap of the prepared nanocomposite films and redshift observed in the calculated values of bandgap for nanocomposites. Consequently, it was proved that by incorporating TiO2 nanoparticles into the polymer matrix, the spectral region of the samples can be expanded resulting in broadened application of such systems in various fields of science and technology.

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Weltrowski, Marek, i Patricia I. Dolez. "Compatibilizer Polarity Parameters as Tools for Predicting Organoclay Dispersion in Polyolefin Nanocomposites". Journal of Nanotechnology 2019 (3.03.2019): 1–9. http://dx.doi.org/10.1155/2019/1404196.

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Nanocomposites give an innovative method to increase the mechanical, thermal, and barrier performance of polymers. However, properly dispersing the nanoparticles in the polymer matrix is often key in achieving high performance, especially in the case of hydrophilic nanoparticles and hydrophobic polymers. For that purpose, nanoparticles may be functionalized with organic groups to increase their affinity with the polymer matrix. Compatibilizing agents may also be included in the nanocomposite formulation. This paper aims at identifying parameters relative to the compatibilizer polarity that would allow predicting nanoparticle dispersion in the polymer nanocomposite. The analysis used published data on nanocomposite samples combining clay nanoparticles, polyolefins, and various compatibilizing agents. We studied the correlations between the nanoclay exfoliation ratio and five different parameters describing the compatibilizer hydrophilic-lipophilic balance: the acid value, the mole, and weight fraction of polar groups, the number of polymer chain units per polar group, and the number of moles of polar groups per mole of compatibilizer. The best correlation was observed with the number of polymer chain units per polar group in the compatibilizer. This parameter could be used as a tool to predict the dispersion of organoclay nanoparticles in polyolefins. Another important result of the study is that, among the compatibilizers investigated, those with a low acid value provided a better nanoclay exfoliation compared to those with a high acid value. This may indicate the existence of a maximum in the nanoclay exfoliation/compatibilizer polarity curve, which would open new perspectives for nanocomposite performance optimization.

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Ramazanov, MA, FV Hajiyeva, AM Maharramov i HM Mamedov. "Microwave absorption of polymer nanocomposites on the base high-density polyethylene and magnetite nanoparticles". Journal of Elastomers & Plastics 51, nr 2 (12.04.2018): 130–42. http://dx.doi.org/10.1177/0095244318768652.

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In this article, we report about the synthesis of magnetic polymer nanocomposites comprising magnetite (Fe3O4) nanoparticles in a polyethylene (PE) matrix. The structure and composition of nanocomposite materials using scanning electron microscopy and atomic force microscopy have been studied. It has been defined that the agglomeration of nanoparticles does not occur, by increasing the volume content of nanoparticles up to 60%, and Fe3O4 nanoparticles act out like single-domain particles. It has also been revealed that nanocomposites based on PE + Fe3O4 with nanoparticle content in a polymer matrix up to 60% behave like superparamagnetic particles. It has also been revealed that the PE + Fe3O4-based nanocomposites effectively absorb the electromagnetic waves in the high frequency range of 0.1–30 GHz. It is shown that the properties of ultrahigh electromagnetic waves can be varied by varying the thickness of the nanocomposite films and the concentration of Fe3O4 nanoparticles.

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Rozprawy doktorskie na temat "Nanoparticles polymer nanocomposites"

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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Shepherd, Céline. "New routes for functionalised nanoparticles for polymer nanocomposites". Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:b148b604-80c9-464f-937c-0b3f1553468a.

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Polymer nanocomposites represent a class of advanced, multifunctional materials, combining the attractive features of both nanomaterials and polymers. The level of dispersion of the nanoparticles directly controls the extent to which nanocomposites can maximize the unique attributes of their nano-scale fillers. However, as a consequence of the tendency of nanofillers to agglomerate, the anticipated superior properties of polymer nanocomposites are yet to be realised, and remain merely a theoretical prediction. As a result, the surface chemistry of nanofillers is often tailored to reduce the attractive interparticle interactions that promote agglomeration. This modification can also be used to enhance the interfacial interactions between the nanofiller and polymer matrices to achieve improved filler dispersion. Accordingly, this thesis addresses this challenge in nanocomposite technology by investigating the chemical surface functionalisation of various nanoparticles in order to produce polypropylene (PP) nanocomposites with superior electrical, mechanical and thermal properties. Part I describes covalent modification of nanosilica, microsilica, furnace Carbon Black (CB), acetylene black (ACB) and carbon nanotube (CNT) nanomaterials by carbene insertion and azo-coupling reactions, in a series of studies, in order to tailor their surfaces for application in polypropylene (PP) nanocomposites. The surface characterisation of the modified nanomaterials was assessed in detail using XPS, CHN, SSNMR, BET, ATR-IR and thermal analysis techniques. The surface grafting densities were estimated to be of the order of 10¹³ and 10¹⁴ molecules/cm² and additionally, SSNMR provided direct evidence of the diarylcarbene reaction to the silica surface. Following nanocomposite production with PP by solvent mixing methods, the macroscopic properties were studied demonstrating altered electrical, mechanical and thermal properties following assessment of the DC conductivity, dielectric properties, thermal analysis (TGA, DSC, DMA) and morphological measurements. In particular, the introduction to the CB surface of a diaryl complex with terminal dodecyl hydrocarbon chains demonstrated substantial improvements to the DC electrical and dielectric properties of the PP nanocomposites. Part II explores the non-covalent surface functionalisation of CB and ACB by the physisorption of the non-ionic surfactant Triton-X-100. Various protocols were developed in which an optimal surface loading for CB was determined by treatment at 0.024 mM(aq). In addition, the modification procedure was combined with the granulation protocol of ACB in an effort to evaluate the potential for industrial applications. The degree of surface functionalisation was extensively characterised by BET, XPS, thermal analysis, UV-Vis and ATR-IR analyses. PP nanocomposites produced by solvent and melt mixing methods demonstrated similar conductive properties following the nanoscale modification, however morphological, dielectric and thermal analysis indicated altered interfacial interactions demonstrating improved mechanical properties.

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Burgos, Marmol Jose Javier. "Molecular simulation of polymer nanocomposites". Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/molecular-simulation-of-polymer-nanocomposites(56a195bb-81ed-4eb8-81d7-b3357d7f2316).html.

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Polymer nanocomposites (PNCs) are hybrid materials incorporating organic or inorganic nanoparticles (NPs) with at least one dimension in the submicron scale. Over the last two decades, these materials have drawn a remarkable attention due to their central role in industrial formulations and technological applications, extending from food packaging to smart coatings. Incorporating nanoparticles (NPs) to a polymer matrix can significantly alter the conformation and the mobility of the polymer chains in their proximity. Moreover, understanding the delicate balance between the enthalpic and entropic interactions is crucial to control and predict the ability of NPs to diffuse and disperse in the polymer matrix. The impact of these interactions on the structure and the dynamics of polymer chains and NPs is fully revealed in how a number of macroscopic properties changes, justifying the high interest on these materials for industrial applications. In this thesis, the impact on the structure, dynamics, viscosity and thermal conductivity of a number of microscopic properties is investigated by performing Molecular Dynamics (MD) simulations. Specifically, the PNC is represented by a coarse-grained model of a melt of linear homopolymer chains containing spherical NPs. Throughout this work, a number of parameters are modified in order to unveil possible patterns in the PNCâs performance. To this end, this work focuses on the consequences of modifying the NP size dispersity, NP-polymer chain relative size, and chainsâ degree of stiffness. Four theoretical models describing the diffusivity of NPs, three of which include nano-scale corrections, have been averaged to study the dependence of dilute NPsâ diffusivity on the NP polydispersity index. By comparing these models to the simulation results at different degrees of polydispersity, it is possible to obtain a more complete picture of their validity as compared to the monodisperse case. Regarding the diffusion of polymer chains, simulation results were in good agreement with the experimental results previously obtained by Composto and coworkers (Soft Matter 2012, 8, 6512), which relate the chainsâ diffusivity to the average interparticle distance. As far as the transport properties are concerned, they show a weaker dependence on the polydispersity index. By contrast, results on viscosity and thermal conducitivity show that they are conditioned by the polymer-NP specific interfacial area and the inverse average mass, respectively. These results are in good agreement with previous experimental results. A deeper examination of this intriguing deviation from viscosity predictions in traditional composites, reveals a non-trivial combination of thickening and thinning effects contributing to the final viscosity of the PNC. This thesis also address the influence of the chainsâ stiffness on the dynamical and viscous behaviour. An isotropic-to-nematic phase transition is observed, regardless of the NP-monomer interactions, below which a monotonic increase of both properties is observed, whereas orientationally ordered systems dramatically modify them, resulting into a steep increase or a smooth decrease depending on the direction in which they are measured.

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Kim, Philseok. "Surface modification of nanoparticles for polymer/ceramic nanocomposites and their applications". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/31651.

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Thesis (Ph.D)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009.
Committee Chair: Perry, Joseph W.; Committee Member: Kippelen, Bernard; Committee Member: Lyon, L. Andrew; Committee Member: Marder, Seth R.; Committee Member: Whetten, Robert L. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Samchenko, Yu M., S. O. Kryklia, T. P. Poltoratska, Леонід Федорович Суходуб, Леонид Федорович Суходуб, Leonid Fedorovych Sukhodub, Yu O. Isheikina, V. I. Makarenko i V. V. Konovalova. "Hybrid Hydrogel Materials with Incorporated Nanoparticles". Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35464.

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Synthesis and physico-chemical studies of new promising hybrid hydrogels based on polyvinyl alcohol (PVA) acetales and copolymer hydrogels based on vynil monomers have been studied. Acrylamide and Acrylnitrile were used as some of components that carry various fillers . Sponge acetales of polyvinyl alco-hol were used as enforcing net. The synthesized composites demonstrated high strength as compared to standard hydrogels- Yung-module varied in the range of 80 to 300 kPa depending on the extent of PVA ac-etale matrix filling with hydrogel component. The materials showed high sorbability to water and water solutions. Study of swelling kinetics as compared to solvents of various nature (water, ethanol, sunflower oil ) was carried out. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35464

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Vitoux, Pauline. "Élaboration de nanocomposites "nanoparticules métalliques / polymère" en milieux fluides supercritiques". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2008. http://tel.archives-ouvertes.fr/tel-00627637.

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Structurer les matériaux composites, pour au moins une des phases, à l'échelle nanométrique, c'est-à-dire former des matériaux nanocomposites, est une voie pour optimiser nombre de leurs propriétés. Le domaine de la propulsion et des propergols n'échappe pas à cette règle. C'est dans ce contexte que s'est déroulée cette thèse sur la synthèse de nanocomposites 'nanoparticules métalliques/polymère' en milieux fluides supercritiques (FSCs). Les principales étapes rencontrées dans l'élaboration de nanocomposites en milieu scCO2 ont été étudiées : i) Etude thermodynamique des systèmes polymère/scCO2, ii) Mesure de leur viscosité et iii) Synthèse de nanoparticules inorganiques dans des polymères en milieux FSCs. De plus, une partie importante de la thèse a concerné la synthèse de nanoparticules d'aluminium en milieux fluides supercritiques en vue de leur intégration dans des matrices polymères pour des applications propergols.

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Mbese, Johannes Zanoxolo. "Synthesis and characterization of metal sulfide nanoparticles/polymer nanocomposites". Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1016190.

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The focus of this project was to synthesize and characterize metal sulfide nanoparticles /polymer nanocomposites. The work involved the synthesis of dithiocarbamato ligands and complexes derived from aniline. Zn(II), Cd(II) and Hg(II) dithiocarbamato complexes were used as single-molecule precursors for the synthesis of the ZnS, CdS and HgS nanoparticles and their optical and structural properties studied. The other focus of this work was to synthesize a combined functionality metal sulfide nanoparticles/polymer nanocomposites by dispersing as-synthesized ZnS, CdS and HgS nanoparticles in polymethyl methacrylate (PMMA) matrix. The characterization of the ligands, complexes, nanoparticles and nanocomposites were investigated using relevant instrumental tools like UV-Vis, photoluminescence (PL), Fourier transform infrared (FTIR), X-ray diffraction (XRD), energy dispersion X-ray (EDX), nuclear magnetic resonance (NMR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

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Yourdkhani, Mostafa. "Aspects of nanoparticles dispersion and interaction in polymer nanocomposites". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123090.

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Polymer nanocomposites have attracted a great deal of attention during the past few decades. Benefiting from the nanoscale geometry, immense surface-to-volume ratio, and exceptional chemical and physical properties, nanoparticles are theoretically expected to enhance the performance of polymer systems. In practice, the preparation of polymer nanocomposites brings its own challenges. To achieve the best reinforcing effect, nanoparticles should be uniformly dispersed within the polymer matrix, and effectively interact with the polymer chains. The strong attractive forces that exist at molecular levels between the nanoparticles through their extensive interfacial area make it very challenging to overcome these issues. Furthermore, the presence of nanoparticles in the polymer matrix significantly alters the processing condition of the polymer system. Therefore, the main objective of this thesis is to investigate the dispersion and interfacial interactions in polymer nanocomposites. To avoid the uncertainties associated with the visual and qualitative analysis of dispersion, which is commonly used by the researchers, a robust algorithm was developed to automatically quantify the state of dispersion in optical and electron micrographs. Several experiments were carried out to perceive the influence of surface modification of nanoparticles on the performance of polymer nanocomposites. Two different material systems were examined: organoclay-modified polylactide (PLA), and carbon nanotube (CNT)-modified epoxy. It was shown that the proper surface modification of nanoparticles could facilitate the dispersion, and consequently, enhance the mechanical and physical performance of the host polymer. To understand the effect of processing conditions on the dispersion quality of nanocomposites, a systematic study on the dispersion stability of CNT-modified epoxy resin was performed. It was found out that at elevated temperatures, CNTs show little affinity for the resin; thereby, any factors that promote the possibility of contacts between the nanotubes may result in their reagglomeration. Consequently, during processing, the dispersion stability is highly influenced with the flow-induced mobility of nanotubes resulting from external shear forces or a change in the viscosity. The insights gained throughout this investigation can be used to optimize the processing conditions and manufacturing methods for maintaining a stable dispersion during processing, and consequently obtaining nanocomposites with enhanced performance.
Les polymères nano-renforcés ont attiré beaucoup d'attention au cours des dernières décennies. Profitant de la géométrie à l'échelle nanométrique, immense rapport surface/volume, et les propriétés chimiques et physiques exceptionnelles, les nanoparticules améliorent en théorie la performance des systèmes de polymères. Dans la pratique, la préparation de polymères nano-renforcés comporte ses propres défis. Pour obtenir le meilleur renforcement possible, les nanoparticules doivent être uniformément dispersées dans la matrice, afin d'interagir efficacement avec les chaînes du polymère. Les forces d'attraction moléculaires qui existent à l'interface entre différentes nanoparticules rendent ces problèmes difficiles à surmonter. En outre, la présence de nanoparticules dans la matrice modifie de manière significative les procédés de fabrication de ce système polymère. Par conséquent, l'objectif principal de cette thèse est d'étudier la dispersion et les interactions interfaciales dans les polymères nano-renforcés. Pour éviter les incertitudes liées à l'analyse visuelle et qualitative de la dispersion, utilisée couramment par les chercheurs, un algorithme robuste a été développé pour quantifier automatiquement l'état de dispersion dans les micrographies optiques et électroniques. Plusieurs expériences ont été réalisées pour comprendre l'influence de la modification de surface des nanoparticules sur la performance des polymères nano-renforcés. Deux matériaux différents ont été examinés: un polylactide (PLA) renforcé avec des organo-argiles, et un époxy renforcé par des nanotubes de carbone (CNT). Il a été démontré qu'une modification appropriée de la surface des nanoparticules pourrait faciliter la dispersion, et par conséquent pourrait améliorer les performances mécaniques et physiques du matériau. Pour comprendre l'effet des procédés de fabrication sur la dispersion des polymères nano-renforcés, une étude systématique sur la stabilité de la dispersion de résine époxyde renforcée par des CNT a été effectuée. Il a été constaté que, à des températures élevées, les nanotubes de carbone présentent peu d'affinité avec la résine, et de ce fait, tous les facteurs qui favorisent la possibilité de contacts entre nanotubes peuvent conduire à leur ré-agglomération. Par conséquent, pendant le procédé de fabrication, la stabilité de la dispersion est fortement influencée par la mobilité induite par l'écoulement de nanotubes résultant de forces de cisaillement externes ou un changement de la viscosité. Les connaissances acquises tout au long de cette enquête peuvent être utilisés pour optimiser les procédés et les méthodes de fabrication afin de maintenir une dispersion stable tout au long de la fabrication, et obtenir ainsi un polymère nano-renforcé avec des performances accrues.

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Cipriano, Bani Hans. "Structure and properties of polymer nanocomposites containing anisotropic nanoparticles". College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7608.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Dept. of Chemical and Biomolecular Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Smith, Jon Anthony. "Polyaniline Gold Nanocomposites". Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4900.

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Polyaniline/Gold Nanocomposites J. Anthony Smith 141 Pages Directed by Dr. Ji and #345;?anata The expectation that it is possible to create a range of new materials from two basic components, polyaniline fibers and gold particles is explored. Three synthetic methods were employed each of which created different materials and required different investigation techniques. The methods are: chemical, one step aniline oxidation / AuCl4- reduction; electrochemical/chemical, a two-step composite growth achieved by electrochemical polyaniline thin film growth followed by film immersion in AuCl4- solution and spontaneous reduction to gold particles; electrochemical, resulting in freestanding polyaniline thin film/Au nanoparticles carried out by electrochemical stripping of a polyaniline thin film grown over a sacrificial gold layer in the presence halide solutions. The incorporation of particles was shown to affect film morphology and electrical properties in all synthetic methods. The changes are in large part attributed to the development of a contact potential between the polyaniline and the gold particles. Applications for the composites include use as chemically sensitive layers, corrosion inhibition materials, and use as probes to evaluate nanoparticle substrate interactions.

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Książki na temat "Nanoparticles polymer nanocomposites"

Lal, Hiran Mayookh, Sabu Thomas, Tianduo Li i Hanna J. Maria, red. Polymer Nanocomposites Based on Silver Nanoparticles. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-44259-0.

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Tuning Nanoparticle Organization and Mechanical Properties in Polymer Nanocomposites. [New York, N.Y.?]: [publisher not identified], 2016.

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Pandey, Jitendra K., Hitoshi Takagi, Antonio Norio Nakagaito i Hyun-Joong Kim. Handbook of Polymer Nanocomposites. Processing, Performance and Application : Volume C: Polymer Nanocomposites of Cellulose Nanoparticles. Springer, 2014.

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Polymer Nanocomposites (Mcgraw-Hill Nanoscience and Technology Series). McGraw-Hill Professional, 2006.

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Koo, Joseph H. Polymer Nanocomposites (Mcgraw-Hill Nanoscience and Technology Series). McGraw-Hill Professional, 2006.

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Thomas, Sabu, Hanna J. Maria, Hiran Mayookh Lal i Tianduo Li. Polymer Nanocomposites Based on Silver Nanoparticles: Synthesis, Characterization and Applications. Springer, 2021.

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Thomas, Sabu, Hanna J. Maria, Hiran Mayookh Lal i Tianduo Li. Polymer Nanocomposites Based on Silver Nanoparticles: Synthesis, Characterization and Applications. Springer International Publishing AG, 2022.

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Polymer And Polymerhybrid Nanoparticles From Synthesis To Biomedical Applications. CRC Press, 2013.

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Zhu, Huijun, James Njuguna i Krzysztof Pielichowski. Health and Environmental Safety of Nanomaterials: Polymer Nancomposites and Other Materials Containing Nanoparticles. Elsevier Science & Technology, 2018.

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Części książek na temat "Nanoparticles polymer nanocomposites"

Jimenez, Guillermo A., Byoung J. Lee i Sadhan C. Jana. "Nanoparticles and Polymer Nanocomposites". W Nanoscale Multifunctional Materials, 87–124. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118114063.ch4.

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Heilmann, A. "Plamon Absorption of Embedded Nanoparticles". W Metal-Polymer Nanocomposites, 183–200. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2004. http://dx.doi.org/10.1002/0471695432.ch6.

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Chi, Hong, Xuemin Zhou i Tianduo Li. "Characterization of Silver/Polymer Nanocomposites". W Polymer Nanocomposites Based on Silver Nanoparticles, 159–90. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-44259-0_7.

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Babu, Noel, i Nikhila Babu. "Applications of Polymer Silver Nanocomposites". W Polymer Nanocomposites Based on Silver Nanoparticles, 191–212. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-44259-0_8.

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Stepanov, A. L. "Optical Extinction of Metal Nanoparticles Synthesized in Polymer by Ion Implantation". W Metal-Polymer Nanocomposites, 241–63. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2004. http://dx.doi.org/10.1002/0471695432.ch8.

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Muñoz-Bonilla, A., J. Sánchez-Marcos i P. Herrasti. "Magnetic Nanoparticles-Based Conducting Polymer Nanocomposites". W Springer Series on Polymer and Composite Materials, 45–80. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46458-9_2.

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Belotelov, V. I., p. Perlo i A. K. Zvezdin. "Magnetooptics of Granular Materials and New Optical Methods of Magnetic Nanoparticles and Nanostructures Imaging". W Metal-Polymer Nanocomposites, 201–40. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2004. http://dx.doi.org/10.1002/0471695432.ch7.

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Yang, Shenghong. "Characterization of Silver Nanoparticles". W Polymer Nanocomposites Based on Silver Nanoparticles, 83–107. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-44259-0_4.

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Derradji, M., D. Trache, A. F. Tarchoun i W. Bessa. "Chapter 6. CNP/Thermosetting Polymer-based Nanocomposites". W Cellulose Nanoparticles : Synthesis and Manufacturing, 115–35. Cambridge: Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781788019545-00115.

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Jadoun, Sapana, i K. F. Anna Dilfi. "Silver Nanoparticles with Natural Polymers". W Polymer Nanocomposites Based on Silver Nanoparticles, 139–57. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-44259-0_6.

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Streszczenia konferencji na temat "Nanoparticles polymer nanocomposites"

Reven, Linda, Jason Wong, Manlin Zhang, Stephan Kouame i Violeta Toader. "LC nanocomposites: polymer functionalized nanoparticles". W Liquid Crystals XXIV, redaktor Iam Choon Khoo. SPIE, 2020. http://dx.doi.org/10.1117/12.2579897.

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Mallick, Shoaib, Zubair Ahmad i Farid Touati. "Polymer Nanocomposite-based Moisture Sensors for Monitoring of the Water Contents in the Natural Gas Pipelines". W Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0073.

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In this study, the polymer-based humidity sensors were investigated for humidity sensing applications. The key advantages of polymers that have garnered this attraction are their lightweight, easy preparation, and low cost of both materials and fabrication process. Different techniques are used to enhance the surface morphology and sensitivity of polymeric films, which include synthesis of nanocomposites, copolymerization techniques, and blending of polymers. The incorporation of nanoparticles to the polymer matrix improves the electrical and mechanical properties of the polymeric film. We have investigated different polymer nanocomposites based humidity sensors on enhancing the sensitivity of the sensor, on achieving faster response and recovery time and lower hysteresis loss as compared to the polymeric humidity sensors. In the first phase, we investigated the PLA-TiO2 nanocomposite for humidity sensing applications. We have optimized the concentration of TiO2 in the PLA-TiO2 nanocomposite and apply acetone for the surface treatment of the sensing film. In the second phase, we studied the PVDF-TiO2 nanocomposite-based humidity sensor, achieved a linear response of the sensor, and optimized the concentration of PVDF. In the third phase, we incorporated the BaTiO3 nanoparticles within optimized PVDF and studied the dielectric property of the nanocomposite film. PVDF-BaTiO3 sensors show a smaller hysteresis response. In the 4th phase, we blend the PVDF with SPEEK polymer; the optimized concentration of SPEEK improves the sensitivity of the humidity sensors at a lower humidity level.

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Pashayi, Kamyar, Hafez Raeisi Fard, Fengyuan Lai, Joel Plawsky i Theodorian Borca-Tasciuc. "Annealing Temperature Effect on the Structure of High Thermal Conductivity Silver/Epoxy Nanocomposites". W ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65578.

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The thermal conductivity κ of polymer nanoparticle composites is typically <10 Wm−1K−1, even when high κ nanofillers are employed, due to the thermal interface resistance between nanoparticles and the polymer matrix1 or the absence of high thermal conductivity pathways. We recently demonstrated high κ in bulk nanocomposites of silver nanoparticles dispersed in epoxy and cured at low temperature (150 °C). A nanocomposite with 30 vol. % 20nm particles exhibited κ ∼30 Wm−1K−1.2 The mechanism responsible for enhancing κ was found to be the self-construction, through in-situ sintering, of high aspect ratio metallic networks inside the nanocomposite.2 In order to control and optimize the network structure and subsequently increase κ even further, this work focuses on studying the effects of curing temperature and nanoparticle surface coating on the structure of the nanocomposite.

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Ounaies, Zoubeida, Atheer Almasri, Sumanth Banda, Yeon Seok Kim i Jaime Grunlan. "Active Nanocomposite Polymers: Enhancing Sensing and Actuation Performance". W ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17057.

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The dispersion of nanoparticles, especially those with high aspect ratio, into polymers has been shown through numerous commercial and academic ventures to yield an array of impressive property enhancements for a surprisingly low volume fraction (<5 vol%) of nanoparticle addition, thus maintaining the inherent processibility of the polymer. In this work, we propose a new generation of sensors and actuators based on a piezoelectric polymer (PVDF) with embedded carbon nanotubes. Polyvinylidene fluoride (PVDF)-double walled carbon-nanotubes (DWNT) composite films are prepared with the goal to develop new polymeric materials with enhanced electrical and electromechanical properties. Electrical conductivity and dielectric properties of polyvinylidene fluoride- double-walled carbon nanotubes composites are investigated as a function of frequency (10 Hz–1 MHz), and as a function of weight fraction (0.01–2 wt%). DWNT and PVDF are mixed under mechanical stirring and sonication. The dispersion is assessed by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM), indicating a good dispersion. Differential Scanning Calorimetery (DSC) is used to study the effect of DWNTs inclusions on the glass transition temperature, Tg, and the crystallinity of the resulting PVDF composite. The percolation threshold is computed by using the bulk conductivity data and it is found that percolation occurs at about 0.19wt%. These investigations promise to increase our understanding of the mechanisms involved, particularly as related to nanoparticle/polymer interaction. This in turn would allow us to tailor the polymer nanocomposites to yield desired performance in terms of actuation voltage, electroactive strain, blocking stress and response time to name a few.

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Laurentia, Laurentia. "POLYMER NANOCOMPOSITES POLYAMIDE / OXIDIZED GRAPHITE NANOPARTICLES". W 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/61/s24.037.

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Du, H., S. H. Ng, K. T. Neo, M. Ng, I. S. Altman, S. Chiruvolu, N. Kambe, R. Mosso i K. Drain. "Inorganic-Polymer Nanocomposites for Optical Applications". W ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17088.

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The combination of organic and inorganic materials forms unique composites with properties that neither of the two components provides. Such functional materials are considered innovative advanced materials that enable applications in many fields, including optics, electronics, separation membranes, protective coatings, catalysis, sensors, biotechnology, and others. The challenge of incorporating inorganic particles into an organic matrix still remains today, especially for nanoparticles, due to the difficulties in their dispersion, de-agglomeration and surface modification. NanoGram has pioneered a nanomaterials synthesis technology based on laser pyrolysis process to produce a wide range of crystalline nanomaterials including complex metal oxides, nitrides and sulfides and with precisely controlled compositions, crystal structure, particle size and size distributions. In this paper we will present some examples of nanocomposites prepared using different polymer host materials and phase-pure rutile TiO2. The inorganic component can be dispersed at higher 50 weight percent into the polymer matrix. We have demonstrated a 0.2–0.3 increase of refractive index in the composite over that of host polymer while maintaining high optical transparency. These nanocomposites can be used in a range of applications or optical devices, such as planar waveguides, flat panel displays, optical sensors, high-brightness LEDs, diffraction gratings and optical data storage. Experimental data on TiO2 nanoparticle characterization, dispersion technique, surface modification and will be presented and nanocomposite properties discussed.

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Khodaparast, Payam, i Zoubeida Ounaies. "On the Dielectric and Mechanical Behavior of Metal Oxide-Modified PVDF-Based Nanocomposites". W ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3302.

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Nanoparticle modified polymers have promise as hybrid materials that exhibit properties beyond those predicted by mixing law theories. In the case of metal-oxide nanoparticles in a polymer, it is expected that multifunctional properties of the obtained nanocomposite, including dielectric and mechanical, will be dominated by presence of interface rather than predicted by the inherent properties of individual components. This paper will focus on understanding the role of different types of nanoparticles, namely, titania, silica and alumina and a polymer matrix, Polyvinylidene fluoride (PVDF) in affecting the final dielectric and mechanical properties.

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Scarton, H. A., I. Kahn, M. A. Rafiee, J. Rafiee, K. Wilt i N. Koratkar. "Evidence of Coulomb Friction Damping in Graphene Nanocomposites". W ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39378.

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Polymer nanocomposites reinforced by carbon nanotubes, fullerene and nanoparticles have been broadly studied within the last two decades. However, it was recently observed that polymer nanocomposites filled with graphene sheets showed exceptional mechanical and electrical properties. The advantage of graphene sheets over carbon nanotubes in nanocomposites may be related to their high specific surface area, enhanced nanofiller-matrix adhesion/interlocking arising from their wrinkled (rough) surface as well as the two-dimensional geometry of graphene sheets. We have compared the vibration damping properties of epoxy nanocomposite filled with single-walled carbon nanotubes (SWNT), multi-walled nanotubes (MWNT), and graphene platelet (GPL) fillers. Our results show the evidence of Coulomb friction damping in nanocomposites comparing with the pure epoxy.

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Alexandrescu, Laurentia, Mihai Georgescu, Maria Sönmez, Anton Ficai, Roxana Trusca i Ioana Lavinia Ardelean. "Polyamide/Polyethylene/Carbon Fibre Polymer Nanocomposites". W The 9th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2022. http://dx.doi.org/10.24264/icams-2022.i.2.

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Polyamide and polyethylene are well known as engineering thermoplastic materials that are widely used in industrial applications for their good mechanical and thermal properties. The paper presents the study of the new nanostructured polymer composites based on polyamide/ compatibilizers/polyethylene/carbon fibres nanoparticles-PA/PE-g-MA/PE/CF in order to obtain, by injection, centre pivot liner, centre plates, and other components for the railway industry, with impact resistance higher than 5-8 kJ/m², abrasion resistance below 100 mm3, resistance to temperatures of -40 - 240°C, resistance to impact and to outdoor applications, with temperatures ranging from -40 to +60°C, in rain, snow or sunshine. The influence of carbon fibres nanoparticles (CF) on the rheological and physico-mechanical properties of the polyamide was studied. The nanocomposites based on polyamide/ compatibilizers/ polyethylene/carbon fibres nanoparticles were characterized by scanning electron microscopy (SEM) and Fourier transformation infrared spectrum (FT-IR) and in terms of physico-mechanical properties. The studied nanocomposites have higher values compared to the blank samples, and the requirements of the railway of impact strength of 5 KJ/m2. Carbon fiber concentrations greater than 1.5% result in decreases in impact strength values, similar to traction resistance values, but not lower than standard values. This leads to the conclusion that the percentages of carbon fibers in the range of 0.1-1.5% achieve maximum values of physical-mechanical parameters.

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Kaushik, Amit K., i Ellen M. Arruda. "High Strain-Rate Response of Polyurethane-Clay Nanocomposites and Their Use for Blast Applications". W ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11956.

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The dispersion of strong nanoscale building blocks into polymers may result in nanocomposites that can mimic the structural and mechanical properties of advanced materials found in nature. In this study, exceptionally high strength and stiffness (in-plane modulus: 270 GPa) clay nanoparticles are used to synthesize polyurethane-clay nanocomposites with enhanced mechanical properties using a layer-by-layer (LBL) technique. The LBL technique allows spatial and orientational control of these clay nanoparticles within the polymer matrix at the nano-scale. Moreover, the structure of LBL manufactured nanocomposites resembles the structure of naturally occurring tough biocomposite Nacre. A series of nanocomposite films with a wide range of volume fractions of clay nanoparticles was manufactured and investigated at low and high strain rates in uniaxial tension and compression deformation states respectively. The growth of these films in the thickness direction was enhanced by replacing alternate layers of MTM nanoparticles with (poly) acrylic acid. Thick samples for the uniaxial compression tests were made by hot-pressing several of these films together. The nanocomposites demonstrated an increasing yield strength and stiffness with volume fractions of MTM nanoparticles. The nanocomposites, at high-strain rate compression, showed a rapid strain hardening with true stresses as high as 0.45 GPa at a strain of 0.8. The incorporation of clay nanoparticles resulted in a plastic deformation leading to large energy dissipation which makes these materials suitable for applications in increasing the survivability of structures under blast loadings.

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Raporty organizacyjne na temat "Nanoparticles polymer nanocomposites"

Moghtadernejad, Sara, Ehsan Barjasteh, Ren Nagata i Haia Malabeh. Enhancement of Asphalt Performance by Graphene-Based Bitumen Nanocomposites. Mineta Transportation Institute, czerwiec 2021. http://dx.doi.org/10.31979/mti.2021.1918.

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As the State of California continues to grow, demand for enhanced infrastructure such as roadways and highways escalates. In view of the current average highway lifespan of 15–20 years, the improvement of asphalt binders leads to material sustainability by decreasing required maintenance and increasing the lifespan of roadways. In the present investigation, enhancement of asphalt binder properties was achieved by different methods of mixing varying compositions of graphene nanoparticles with an SBS polymer and asphalt binder. Additionally, experimental evaluation and comparison of the rheological and mechanical properties of each specimen is presented. Graphene nanoparticles have attracted great curiosity in the field of highway materials due to their incredible rigidity, even in small quantities. Addition of as little as 1.0%nanoparticles in combination with polymers in an asphalt binder is expected to increase the rigidity of the material while also maintaining the beneficial polymer characteristics. Evaluation of the effect of the mixing design established that the methods for application of graphene to the polymer-modified asphalt binder are critical in the improvement of a roadway, resulting in resistance to premature aging and strain from constant road operation.

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Wei, Kung-Hwa. High-Sensitivity Conjugated Polymer/Nanoparticle Nanocomposites for Infrared Sensor Applications. Fort Belvoir, VA: Defense Technical Information Center, marzec 2011. http://dx.doi.org/10.21236/ada538201.

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