Дисертації з теми "Nanoparticles polymer nanocomposites"
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Paul, Anita N. "Silver-Polymer Nanocomposites." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3077.
Повний текст джерелаShepherd, 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.
Повний текст джерелаBurgos, 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.
Повний текст джерелаKim, 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.
Повний текст джерелаCommittee 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.
Samchenko, Yu M., S. O. Kryklia, T. P. Poltoratska, Леонід Федорович Суходуб, Леонид Федорович Суходуб, Leonid Fedorovych Sukhodub, Yu O. Isheikina, V. I. Makarenko, and V. V. Konovalova. "Hybrid Hydrogel Materials with Incorporated Nanoparticles." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35464.
Повний текст джерелаVitoux, 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.
Повний текст джерелаMbese, Johannes Zanoxolo. "Synthesis and characterization of metal sulfide nanoparticles/polymer nanocomposites." Thesis, University of Fort Hare, 2013. http://hdl.handle.net/10353/d1016190.
Повний текст джерелаYourdkhani, 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.
Повний текст джерелаLes 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.
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.
Повний текст джерелаThesis 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.
Smith, Jon Anthony. "Polyaniline Gold Nanocomposites." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4900.
Повний текст джерелаInglefield, Jr David Lott. "Tailoring Intermolecular Interactions for High-Performance Nanocomposites." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/64411.
Повний текст джерелаPh. D.
Inglefield, David Lott Jr. "Tailoring Intermolecular Interactions for High-Performance Nanocomposites." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/64411.
Повний текст джерелаPh. D.
Wilson, Jessica L. "Synthesis and magnetic properties of polymer nanocomposites." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000380.
Повний текст джерелаWåhlander, Martin. "Controlled Polymer Grafting from Nanoparticles for the Design of Dielectric Nanocomposites." Doctoral thesis, KTH, Ytbehandlingsteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204036.
Повний текст джерелаIntresset för polymera nanokompositer har snabbt ökat under de senaste decennierna, drivet av den stora potentialen och de överlägsna egenskaperna hos nanopartiklar (NPs). Produktionsvolymerna för kommersiella NP har ökat exponentiellt under de senaste tio åren, och kvaliteten har förbättrats avsevärt. Syftet med denna studie var att polymer-ympa kommersiellt tillgängliga metalloxid-NPs, och grafenoxid (GO), för att designa isotropa (homogena) och anisotropa (heterogena) polymera nanokompositer för dielektriska tillämpningar. Motiveringen var att formulera funktionella isoleringsmaterial för kompakta komponenter i framtida kraftnätssystem som använder högspänd likström (HVDC) eller högspänd växelström (HVAC), samt att tillverka responsiva sensormaterial för övervakning av t.ex. temperatur- and spänningsvariationer i så kallade "Smart Grids". Aluminiumoxid (Al2O3), zinkoxid (ZnO) och reducerad GO (rGO) NPs modifierades med glesa polymerympar via en kontrollerad "kovalent väg" och blandades med silikon (PDMS) eller polyeten matriser (EBA och LDPE) som är vanliga i HV-kabelsystem. Ymplängden och ymp-till-matrix kompatibiliteten skräddarsyddes för att erhålla nanokompositer med olika självordnande NP-morfologier, inklusive väldispergerade, länkade och fasseparerade strukturer. Ymplängden användes för att justera partikelavståndet i nanokompositer med förbundna morfologier eller länkade NPs. Man fann att nanokompositer med länkade NPs och korta interpartikelavstånd uppvisade 10-100 gånger högre konduktivitet än den ofyllda (rena) polymeren, eller erhöll en snabb icke-linjär ökning i konduktivitet (~1 miljon gånger) med ökande elektriskt fält, medan väldispergerade NPs med långa interpartikelavstånd uppvisade 10-100 gånger lägre ledningsförmåga (dvs. högre resistivitet) som en effekt av deras infångande av laddningsbärare. Dessa inställbara och funktionella egenskaper är önskvärda för HV-isolering, fältstyrande applikationer och flexibel elektronik. Dessutom visades att GO, som modifierats med täta polymerympar via en "fysisorptionsväg", bildade suspensioner med flytande kristaller, eller matrisfria GO-kompositer med väldispergerad GO i isotropa eller nematiska tillstånd. Dessa material armerades av GO och uppvisade förhöjda glastransitionstemperaturer och en snabb värmeresponsiv form-minneseffekt, och föreslås därigenom ha en stor potential som sensor-material och responsiva separationsmembran.
QC 20170323
Cheerarot, Onanong. "The effects of nanoparticles on structure development in immiscible polymer blends." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/the-effects-of-nanoparticles-on-structure-development-in-immiscible-polymer-blends(cca9d075-dfcd-46c5-b865-290c414b4315).html.
Повний текст джерелаWang, Nannan. "Carbon-coated nanoparticles and their application in high performance polymer nanocomposites." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/33110.
Повний текст джерелаDzhardimalieva, G. I., and A. D. Pomogailo. "Polymer-Assisted Synthesis, Structure and Properties of Metal Nanocomposites." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35061.
Повний текст джерелаStojak, Kristen Lee. "Synthesis and Properties of Polymer Nanocomposites with Tunable Electromagnetic Response." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4587.
Повний текст джерелаKhan, Assad Ullah. "Thin-Film Polymer Nanocomposites Composed of Two-Dimensional Plasmonic Nanoparticles and Graphene." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/101942.
Повний текст джерелаDoctor of Philosophy
Fogelström, Linda. "Polymer Nanocomposites in Thin Film Applications." Doctoral thesis, KTH, Ytbehandlingsteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12400.
Повний текст джерелаQC20100621
Guerra, Dante Rene. "INFLUENCE OF NANOPARTICLES ON THE PHISICAL PROPERTIES OF FIBER REINFORCED POLYMER COMPOSITES." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259091518.
Повний текст джерелаChaparro, Dayling L. "Novel Polymer-Metal Nanocomposites for Applications in Detection and Sensing." Scholar Commons, 2007. http://scholarcommons.usf.edu/etd/3900.
Повний текст джерелаGendre, Laura. "A study of emission of nanoparticles during physical processing of aged polymer-matrix nanocomposites." Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/12381.
Повний текст джерелаChen, Hui. "DEVELOPMENT AND APPLICATION STUDY OF NANOSCALE THIN FILM MATERIALS AND POLYMER NANOCOMPOSITES." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2124.
Повний текст джерелаPh.D.
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Materials Science & Engr PhD
Doddapaneni, Venkatesh. "On the polymer-based nanocomposites for electrical switching applications." Doctoral thesis, KTH, Tillämpad fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202702.
Повний текст джерелаNy forskning har visat att polymerbaserade nanokompositer (PNCs) har utformats för att förbättra strömbrytares förmåga att undvika ljusbågar vid överslag. PNCs är en kombination av nanostora oorganiska nanopartiklar (NP) och polymerer, som har öppnat upp för ny utveckling inom materialvetenskap och tekniska tillämpningar. Oorganiska NP väljs baserat på deras fysikaliska och kemiska egenskaper som kan hjälpa PNCs att motverka elektriska ljusbågar effektivt. I synnerhet, presenterade vi PNCs tillverkade genom användning av CuO, Fe3O4, ZnO och Au NP i en poly (metylmetakrylat) (PMMA)-matris via in situ-polymerisationsmetod, nyligen utvecklad för att undvika NP-agglomerering, vilket leder till god rumslig fördelning i polymermatrisen. Därför har flera prover med olika vikt% av NP i PMMA-matris tillverkats. Dessa PNCs har utvärderats i detalj för NP-morfologi, interaktion mellan NP och polymermatris, och strålnings- och värmeenergiabsorption. I nästa skede testas PNCs för att bestämma deras förmåga att undvika ljusbågar och påverkan på de elektriska ljusbågarna av 1,6 kA strömstyrka, genererade med hjälp av en specialdesignad test-set-up. När PNCs interagerar med de elektriska ljusbågarna, genererar de ablation av kemiska ämnen mot kärnan i den elektriska ljusbågen, vilket resulterar i nedkylning av ljusbågen på grund av starka temperatur- och tryckgradienter i området. Denna avhandling visar för första gången att dessa konstruerade PNCs är lätta att framställa, reproducerbara, och kan användas för att förbättra avbrottsprocessen för ljusbågen i elektriska kopplingstillämpningar.
QC 20170303
Jing, Hengye. "The Interaction of Engineered Nanoparticles with Microbial Biofilm and its Applications." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511799004863635.
Повний текст джерелаLi, Yonghui. "Biodegradable poly(lactic acid) nanocomposites: synthesis and characterization." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/8543.
Повний текст джерелаDepartment of Grain Science and Industry
X. Susan Sun
Biobased polymers derived from renewable resources are increasingly important due to acute concerns about the environmental issues and limited petroleum resources. Poly(lactic acid) (PLA) is such a polymer that has shown great potential to produce biodegradable plastics. However, low glass transition temperature (Tg), low thermal stability, slow biodegradation rate, and high cost limit its broad applications. This dissertation seeks to overcome these limitations by reinforcing PLA with inorganic nanoparticles and low-cost agricultural residues. We first synthesized PLA nanocomposites by in situ melt polycondensation of L-lactic acid and surface-hydroxylized nanoparticles (MgO nanocrystals and TiO2 nanowires) and investigated the structure-property relationships. PLA grafted nanoparticles (PLA-g-MgO, PLA-g-TiO2) were isolated from the bulk nanocomposites via repeated dispersion/centrifugation processes. The covalent grafting of PLA chains onto nanoparticle surface was confirmed by Fourier transform infrared spectroscopy and thermalgravimetric analysis (TGA). Transmission electron microscopy and differential scanning calorimetry (DSC) results also sustained the presence of the third phase. Morphological images showed uniform dispersion of nanoparticles in the PLA matrix and demonstrated a strong interfacial interaction between them. Calculation based on TGA revealed that more than 42.5% PLA was successfully grafted into PLA-g-MgO and more than 30% was grafted into PLA-g-TiO2. Those grafted PLA chains exhibited significantly increased thermal stability. The Tg of PLA-g-TiO2 was improved by 7 °C compared with that of pure PLA. We also reinforced PLA with low-value agricultural residues, including wood flour (WF), soy flour (SF), and distillers dried grains with solubles (DDGS) by thermal blending. Tensile measurements and morphological images indicated that methylene diphenyl diisocyanate (MDI) was an effective coupling agent for PLA/WF and PLA/DDGS systems. MDI compatibilized PLA/WF and PLA/DDGS composites showed comparable tensile strength and elongation at break as pure PLA, with obviously increased Young’s modulus. Increased crystallinity was observed for PLA composites with SF and DDGS. Such PLA composites have similar or superior properties compared with pure PLA, especially at a lower cost and higher biodegradation rate than pure PLA. The results from this study are promising. These novel PLA thermoplastic composites with enhanced properties have potential for many applications, such as packaging materials, textiles, appliance components, autoparts, and medical implants.
Li, Rui. "Plastic UV radiation protection operating by Stokes emission." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/12434.
Повний текст джерелаMusino, Dafne. "Impact of surface modification on the structure and dynamics of silica-polymer nanocomposites." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTS015/document.
Повний текст джерелаNanocomposite materials made by dispersion of nano-scale fillers in a soft polymer matrix attract industrial interest because of their enhanced properties. During their formulation, filler-filler and filler-polymer interactions affect the dispersion of the particles, and thus the final nanocomposite structure. The filler dispersion as well as dynamical properties control many material properties and in particular the mechanical response of these materials.In this PhD work, we propose the study of nanocomposites made by dispersion of nano-metric hydrophilic silica particles in a soft hydrophobic polymer matrix of styrene/butadiene (SB), which is commonly used in car tire manufacturing. Since coating agents can react with the filler surface tuning the silica-silica and the silica-polymer interactions, they have been used to promote the compatibility between silica and SB. Firstly, we investigate “simplified industrial nanocomposites” obtained by solid mixing of SB and millimetric silica pellets. By a multiscale approach (microscopy and X-ray scattering, SAXS) we show that: i) the presence of a catalyzer (DPG) unambiguously amplifies the action of the coating agent; ii) the increase of silane content induces the progressive decrease of silica aggregate size. The study of the simplified industrial nanocomposites has been extended to a silica/SB model system. We developed an efficient method to surface-modify colloidal silica NPs in ethanol/water, to stabilize them in the same solvent (MEK) used to dissolve the polymer, and to obtain the final model nanocomposite by solvent casting. For the structural characterization of this multi-step system, we propose a combined SAXS-reverse Monte Carlo approach which allows to investigate the dispersion state of surface-modified silica NPs in precursor solvents (i.e., ethanol/water and MEK) and in the polymer matrix. The filler dispersion is influenced by the characteristics of the grafted silane molecule (varying hydrophobicity, grafting function, and density) and it is shown the quality of the dispersion state is maintained from the precursor suspension to the nanocomposite. Moreover, Broadband Dielectric Spectroscopy (BDS) has been used to investigate the role of silane coating agents in the segmental dynamics of model nanocomposites. We show that the silane molecules can act as plasticizers in pure styrene-butadiene matrices, inducing a significant decrease of the glass transition temperature. We also prove that the chemical surface-modification of the fillers does not affect the segmental dynamics (α-relaxation) in nanocomposites, whereas the presence of “free” silane molecules in the polymer bulk can induce a detectable plasticization effect
Julien, Tamalia. "Synthesis, Modification, Characterization and Processing of Molded and Electrospun Thermoplastic Polymer Composites and Nanocomposites." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7631.
Повний текст джерелаKaur, Jasmeet. "Properties of biologically relevant nanocomposites: effects of calcium phosphate nanoparticle attributes and biodegradable polymer morphology." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33981.
Повний текст джерелаGlogowski, Elizabeth M. "Nanoparticle functionalization and grafting-from chemistry for controlling surface properties and nanocomposite behavior." Amherst, Mass. : University of Massachusetts Amherst, 2009. http://scholarworks.umass.edu/dissertations/AAI3349701/.
Повний текст джерелаSchlea, Michelle Renee. "Processing and characterization of high performance polyimide nanocomposites." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39557.
Повний текст джерелаHaba, D., M. Barbezat, and A. J. Brunner. "Secondary Crack Formation as Fracture Mechanism in Nanocomposites of Epoxy and Fullerene-Like WS2." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42488.
Повний текст джерелаCapozzi, Charles J. "Controlled self-assembly of ito nanoparticles into aggregate wire structures in pmma-ito nanocomposites." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28277.
Повний текст джерелаCommittee Chair: Gerhardt, Rosario; Engineering: Dr. Arun M. Gokhale; Engineering: Dr. Preet Singh; Engineering: Dr. Mohan Srinivasarao; Engineering: Dr. Meisha Shofner.
Starkweather, Nathan S. "Controlling Nanoparticle Dispersion For Nanoscopic Self-Assembly." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/973.
Повний текст джерелаPirner, Daniela [Verfasser], and Stephan [Akademischer Betreuer] Förster. "Controlled Preparation of Nanoparticles and Polymer Core-Shell Structures for Use in Organogels and Nanocomposites / Daniela Pirner ; Betreuer: Stephan Förster." Bayreuth : Universität Bayreuth, 2017. http://d-nb.info/1128226138/34.
Повний текст джерелаVU, YEN THI. "SYNTHESIS AND CHARACTERIZATION OF ELASTOMER-BASED COMPOSITES AND POLYMER-IMMOBILIZED COLLOIDAL TRANSITION METAL NANOPARTICLES: CATALYTIC SELECTIVITY AND MORPHOLOGY." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1004541836.
Повний текст джерелаHancock, Matthew Logan. "THE FABRICATION AND CHARACTERIZATION OF METAL OXIDE NANOPARTICLES EMPLOYED IN ENVIRONMENTAL TOXICITY AND POLYMERIC NANOCOMPOSITE APPLICATIONS." UKnowledge, 2019. https://uknowledge.uky.edu/cme_etds/112.
Повний текст джерелаRahneshin, Vahid. "Versatile High Performance Photomechanical Actuators Based on Two-dimensional Nanomaterials." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/549.
Повний текст джерелаNawaz, Sohail. "Preparation and long-term performance of poly(ethylene-co-butyl acrylate) nanocomposites and polyethylene." Doctoral thesis, KTH, Polymera material, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104685.
Повний текст джерелаQC 20121109
Cable insulation materials
Loss of deltamethrin and pipronyl butoxide from polyethylene
long-term performance of polyethylene in chlorine dioxide water
Repa, Kristen Lee Stojak. "Confinement Effects and Magnetic Interactions in Magnetic Nanostructures." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6573.
Повний текст джерелаWang, Xiaoteng. "Directed Nano-Patterning of Polymer Nanocomposite Thin Films." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1462141968.
Повний текст джерелаMatinise, Nolubabalo. "Electrolytic determination of phthalates organic pollutants with n nostructured titanium and iron oxides sensors." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_1177_1305892404.
Повний текст джерелаThis work reports the chemical synthesis, characterisation and electrochemical application of titanium dioxide (TiO2) and iron oxide (Fe2O3) nanoparticles in the determination of phthalates. The other part of this work involved electrochemical polymerization of aniline doped with titanium and iron oxide nanoparticles for the sensor platform in the electrolytic determination of phthalates. The TiO2 and Fe2O3 nanoparticles were prepared by sol gel and hydrothermal methods respectively. Particle sizes of 20 nm (TiO2) and 50 nm (Fe2O3) were estimated from transmission electron microscopy (TEM) The other technical methods used in this study for the characterization of the TiO2 and iron oxide Fe2O3 NPs were SEM, XRD and UV- visible spectroscopy. Cyclic voltammetry, square wave voltammetry and electrochemical impedance spectroscopy (EIS) were used to study the electrochemical properties of the nanoparticles. These electrochemical studies of the nanoparticles were performed with a Fe2O3 or TiO2/nafion/glassy carbon membrane electrode in 0.1 M phosphate buffer (pH 7.0) and 0.1 M lithium perchlorate (pH 6.8) under an aerobic condition.
Armas, Jeremy A. "Influence of High Aspect Ratio Nanoparticle Filler Addition on Piezoelectric Nanocomposites." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/2026.
Повний текст джерелаTanja, Radusin. "Priprema i karakterizacija nanokompozita polimlečne kiseline i silicijum (IV) oksida namenjenog za pakovanje hrane." Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=94853&source=NDLTD&language=en.
Повний текст джерелаPoly(lactic acid) presents one of the most popular bio-polymers for diverse applications. However, the use of PLA as food packaging material is limited due to poor barrier and mechanical properties. These properties could be improved by incorporation of nanoparticles into polymer matrix.In this work neat PLA films and PLA films with different percentage of hydrophobic fumed silica nanoparticles (0,2 wt.% to 5 wt.%) were prepared by solution casting and melt blending methods. Several procedures were used to characterize the influence of different silica content on dispersion (SEM), crystalline behavior (WAXD), thermal stability (DSC, TGA), mechanical and barrier properties. It is shown that the applied techniques and selection of specific hydrophobic spherical nanofiller provide a good dispersion and distribution of silica nanoparticles in poly(lactic acid) for both film preparation methods.Characteristics of films prepared by solution casting method showed improvements in mechanical and barrier properties for all loadings of nanofiller but the most significant improvements were achieved for lowest silica content (0,2 wt.% and 0,5 wt.%) The improvements in material characteristics (mechanical and barrier) for melt blending method were also achieved (for concentrations from 0,2 wt.% to 3 wt.%).After film preparation, selected cuts of M. longissimus thoracis et lumborum were packed in prepred films of polymer nanocomposites, and the shelf-life characterisation was conducted on technological, sensory and microbiological paramethers of quality. After shelf-life characterisation it can be concluded that polymer nanocomposites based on PLA and silica nanoparticles could be used for packaging od fresh pork meat in vacuum.
Wozniak, A., A. Yegorov, and V. Ivanov. "Novel Polymer Nanocomposite with Silicon Carbide Nanoparticles." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42514.
Повний текст джерелаZinovyeva, Veronika. "Matériaux composés (polymères électroactif - nanoparticules de métal) et liquides ioniques." Thesis, Dijon, 2010. http://www.theses.fr/2010DIJOS056.
Повний текст джерелаThe actual PhD thesis is devoted to syntheses of composite materials combining conducting polymers with transition metals, their characterization with the use of a large set of modern physical, chemical and electrochemical methods and initial studies of their catalytic applications. These processes were realized both in conventional (aqueous and organic) media and in room-temperature ionic liquids. As an approach for the chemical synthesis, a simple one-pot non-template method, consisting in the chemical reduction of various inorganic salts by pyrrole monomer in a set of solvents, was applied. Polymerization of pyrrole with the use of Fe(III), Cu(II) and Pd(II) salts as oxidants was carried out in a wide range of reaction conditions. The kinetics of the polymerization process was studied by UV-visible spectroscopy and DLS. The obtained materials were characterized by means of cyclic voltammetry, elemental CHNS analysis, ICP-AES, AFM, SEM, EDX, TEM, XRD, XPS, XAS, IR techniques. Catalytic and electrocatalytic properties of the synthesized Pd/polypyrrole nanocomposites were analyzed for the direct catalytic arylation of heteroaromatics and electrooxidation of ascorbic acid. Alternative ways to conducting polymer preparation in the form of films and powders inside ionic liquids, in comparison to those in conventional media, were described. The influence of the synthesis conditions and of the solvent nature on electrochemical properties and morphology of conducting polymers was discussed. The electrooxidation of ferrocene in ionic liquids was investigated in details, and a model for the diffusional transport in these viscous media was proposed
Boday, Dylan Joseph. "SILICA AEROGEL-POLYMER NANOCOMPOSITES AND NEW NANOPARTICLE SYNTHESES." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194891.
Повний текст джерелаTAWFILAS, MASSIMO. "Surface decoration of inorganic nanoparticles for novel polymer-based nanocomposite materials." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241271.
Повний текст джерелаSurface ligand engineering is an effective tool used to enhance polymer nanocomposites materials performance, since it plays a key role on one of the trickiest issues: the incompatibility between the organic and inorganic phase. The introduction of a thin polymeric layer enables a good dispersion of the inorganic nanocrystals (NCs) in polymer matrices, where otherwise bare particles aggregate and precipitate. The surface modification is an effective method to introduce additional functionalities to the NPs, giving new properties for a large number of applications. During my research I synthesized different titanium dioxide NCs of different phase and size. I investigated the behavior of bare TiO2 NCs in water. Taking advantage of the interaction between water molecules and titanium dioxide NCs, we found that water interacts in a way that make it a probe able to identify the titanium dioxide crystalline phase. Then an intensive study was done to understand the role of solvents during the grafting process in terms of interaction with polymer chains and inorganic surface. At first a study was done on the grafting-to process of polyethylene oxide monomethylether (mPEO) and polystyrene (PS) on spherical anatase NCs. Commercial mPEO of different molecular weight and polystyrene, synthesized via RAFT polymerization, were used and modified with different anchoring group. The polymers were grafted on anatase NCs through grafting-to approach using different solvents and experimental conditions. Water and methylene chloride were selected according to their ability to interact with the polymer chains and the NC’s surface. Thanks to this massive work we improved our knowledge on the grafting-to approach; we produced a method to create NCs with controlled graft densities and well-defined conformations. Thanks to our experience built during these years of research activity, we were able to prepare a nanocomposite material based on thermoplastic polyurethane (TPU). We started from a mixed double layer system tethered on rod-like anatase nanocrystal. The NCs covered with oleic acid (OA) were synthesized with a colloidal process and modified with a grafting-to approach using a high molecular weight mPEO. The as synthesized object is composed by a high density layer of OA and a low density layer of mPEO (mPEO-OA@Anatase). In order to investigate the properties of this type of objects, a set of nanocomposite materials based on mPEO-OA@Anatase and OA@Anatase were produced in a highly aliphatic TPU matrix with a solvent casting process. It was observed that for both mPEO-OA@Anatase and OA@Anatase optically clear films with improved refractive index (1.63) were obtained. The mechanical tests showed better elastic modulus for filler loaded nanocomposite materials. In particular the mPEO-OA@Anatase presented a higher elastic modulus than OA@Anatase when loaded with the same amount of nanofiller without affecting the optical properties. During my research period abroad, I spent 7 months at Dr. Benicewicz’s group in the University of South Carolina (USA). The aim of my project was focused on the synthesis of new nanocomposite material in the gas separation field. In the first part of the project we prepared a set of samples based on fumed silica (FS) particles using a grafting-from approach to modify the surface with RAFT polymerization. This kind of particles were not able to self-assemble in an organized and no improvement of the the gas permeation properties, even if FS were well dispersed into the polymer matrix. Experimental data confirmed that FS acts as a physical gas barrier. In the second part of the project were synthesized a nanocomposite material using the same approach on silica NP with polymethacrylamide with oligoaniline side chain. These NPs were able to self-assemble in a controlled fashion and thanks to a more selective polymer we obtained a material with enhanced permeability and selectivity to CO2.