Bibliographies thématiques / Films nanocomposite

Littérature scientifique sur le sujet « Films nanocomposite »

Auteur : Grafiati
Publié le 13 avril 2024

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Articles de revues sur le sujet "Films nanocomposite"

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Wang, Wei, Zhen Li et Li Li. « Preparation and Characterization of Fe3O4/Poly (2-Hydroxyethyl Methacrylate) Magnetic Nanocomposite Films ». Key Engineering Materials 396-398 (octobre 2008) : 465–68. http://dx.doi.org/10.4028/www.scientific.net/kem.396-398.465.

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Magnetic nanocomposite films of the Fe3O4/pHEMA were prepared by dispersing the Fe3O4 nanoparticles into the HEMA monomer before they were polymerized. The resultant nanocomposite films were characterized by Fourier transform infrared (FT-IR) and the vibrating sample magnetometer (VSM). The swelling behavies and the hemolytic ratios of the filmes were also investigated in this work.The equilibrium swelling ratio decreased with the increase of the amount of nanoparticles. The nanocomposite films had a clear superparamagnetic behavior because of the addition of nanoparticles. The hemolytic ratios were all lower than 5%, which indicated that the nanocomposites films had the good blood compatibility and can be used in the biomedical field
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Kumari, Sangeeta, Raj Pal Singh, Nayaku N. Chavan, Shivendra V. Sahi et Nilesh Sharma. « Characterization of a Novel Nanocomposite Film Based on Functionalized Chitosan–Pt–Fe3O4 Hybrid Nanoparticles ». Nanomaterials 11, no 5 (13 mai 2021) : 1275. http://dx.doi.org/10.3390/nano11051275.

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The development of organic—inorganic hybrids or nanocomposite films is increasingly becoming attractive in light of their emerging applications. This research focuses on the formation of a unique nanocomposite film with enhanced elasticity suitable for many biomedical applications. The physical property measurement system and transmission electron microscopy were used to analyze Pt–Fe3O4 hybrid nanoparticles. These nanohybrids exhibited magnetic effects. They were further exploited to prepare the nanocomposite films in conjunction with a chitosan-g–glycolic acid organic fraction. The nanocomposite films were then examined using standard techniques: thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, and atomic force microscopy. Tensile strength testing demonstrated a significantly greater elastic strength of these nanocomposite films than pure chitosan films. The water absorption behavior of the nanocomposites was evaluated by measuring swelling degree. These nanocomposites were observed to have substantially improved physical properties. Such novel nanocomposites can be extended to various biomedical applications, which include drug delivery and tissue engineering.
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Alakrach, Abdulkader M., Awad A. Al-Rashdi, Mohamed Khalid Al-Omar, Taha M. Jassam, Sam Sung Ting, Omar S. Dahham et Nik Noriman Zulkepli. « Physical and Barrier Properties of Polylactic Acid/Halloysite Nanotubes-Titanium Dioxide Nanocomposites ». Materials Science Forum 1021 (février 2021) : 280–89. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.280.

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In this study, PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites films were fabricated via solution casting method. By testing the film density, solubility, water contact angle and water vapor permeability, the PLA nanocomposite films, the comprehensive performances of the nanocomposites were analysed. The outcomes demonstrated that maximum film density of PLA/TiO2 and PLA/HNTs-TiO2 nanocomposites films increased gradually with the increasing of nanofiller loadings. Moreover, the incorporation of TiO2 and HNTs-TiO2 significantly decreased the water vapor transmittance rate of the nanocomposite films with a slight priority to the addition of HNTs-TiO2, the water solubility was significantly improved with the addition of both nanofillers. Furthermore, the barrier properties were developed with the addition of both TiO2 and HNTs-TiO2 especially after the addition of low nanofiller loadings. Overall, the performance of the PLA/HNTs-TiO2 nanocomposite films was better than that PLA/TiO2 film. Nevertheless, both of the PLA nanocomposite samples achieved the requests of food packaging applications.
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Al-Asbahi, Bandar Ali, Mohammad Hafizuddin Haji Jumali et Rashad Al-Gaashani. « Efficient Charge Transfer Mechanism in Polyfluorene/ZnO Nanocomposite Thin Films ». Journal of Nanomaterials 2014 (2014) : 1–8. http://dx.doi.org/10.1155/2014/608572.

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The optical properties and charge transfer mechanism of poly (9,9′-di-n-octylfluorenyl-2.7-diyl) (PFO)/ZnO thin films have been investigated. The ZnO nanorods (NRs) were prepared via a microwave technique. The solution blending method was used to prepare the PFO/ZnO nanocomposites. X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM) were used to determine the structural properties, while UV-Vis and photoluminescence (PL) were employed to investigate the optical properties of the films. XRD patterns confirmed that there was no variation in the structure of both PFO and ZnO NRs due to the blending process. FE-SEM micrographs displayed that ZnO NRs were well coated by PFO in all nanocomposite films. The absorption spectra of the nanocomposite thin films exhibited a red-shift indicating the increment in conjugation length of the PFO/ZnO nanocomposite. Significant quenching in the emission intensity of PFO was observed in fluorescence spectra of the nanocomposite films. This quenching was attributed to efficient charge transfer in the PFO/ZnO nanocomposites, which was further supported by the shorter PL lifetime of PFO/ZnO than that of the PFO thin film. The continuous decline in PL intensity of these nanocomposites is attributed to homogenous dynamic quenching between PFO and ZnO NRs.
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Suppiah, K., Teh Pei Leng, S. Husseinsyah, R. Rahman et Yeoh Chow Keat. « The Mechanical Properties of Carboxymethyl Cellulose (CMC) Filled Halloysite Nanotube (HNT) Bio-Nanocomposite Films : Effect of Sodium Dodecyl Sulfate (SDS) ». Solid State Phenomena 280 (août 2018) : 335–39. http://dx.doi.org/10.4028/www.scientific.net/ssp.280.335.

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In this study, carboxymethyl cellulose (CMC) used as matrix, while halloysite nanotube (HNT) used as nanofiller to produce bio-nanocomposite films via solvent casting method. The effect of sodium dodecyl sulfate (SDS) on tensile properties and morphology study of CMC/HNT bio-nanocomposite films have been investigated. The results showed that the mechanical properties of treated CMC/HNT bio-nanocomposite films using SDS enhanced the tensile strength, elongation at break and modulus of elasticity compared to untreated CMC/HNT bio-nanocomposites. Besides, the tensile fracture surface of treated bio-nanocomposites demonstrated by field emission scanning electron micrograph (FESEM) indicates that the presence of SDS improved the interfacial interaction between CMC matrix and treated HNT nanofiller.
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Sapkota, Bedanga, Md Tanvir Hasan, Alix Martin, Rifat Mahbub, Jeffrey E. Shield et Vijaya Rangari. « Fabrication and magnetoelectric investigation of flexible PVDF-TrFE/cobalt ferrite nanocomposite films ». Materials Research Express 9, no 4 (1 avril 2022) : 046302. http://dx.doi.org/10.1088/2053-1591/ac6151.

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Abstract Flexible nanocomposite films, with cobalt ferrite nanoparticles (CFN) as the ferromagnetic component and polyvinylidene fluoride–trifluoroethylene (PVDF-TrFE) copolymer as the ferroelectric matrix, were fabricated using a blade coating technique. Nanocomposite films were prepared using a two-step process; the first process involves the synthesis of cobalt ferrite (CoFe2O4) nanoparticles using a sonochemical method, and then incorporation of various weight percentages (0, 2.5, 5, and 10%) of cobalt ferrite nanoparticles into the PVDF-TrFE to form nanocomposites. The ferroelectric polar β phase of PVDF-TrFE was confirmed by x-ray diffraction (XRD). Thermal studies of films showed notable improvement in the thermal properties of the nanocomposite films with the incorporation of nanoparticles. The ferroelectric properties of the pure polymer/composite films were studied, showing a significant improvement of maximum polarization upon 5wt% CFN loading in PVDF-TrFE composite films compared to the PVDF-TrFE film. The magnetic properties of as-synthesized CFN and the polymer nanocomposites were studied, showing a magnetic saturation of 53.7 emu g−1 at room temperature, while 10% cobalt ferrite-(PVDF-TrFE) nanocomposite shows 27.6 emu/g. We also describe a process for fabricating high optical quality pure PVDF-TrFE and pinhole-free nanocomposite films. Finally, the mechanical studies revealed that the mechanical strength of the films increases up to 5 wt% loading of the nanoparticles in the copolymer matrix and then decreases. This signifies that the obtained films could be suited for flexible electronics.
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Lin, Bao Ping, Hong Jian Liu, Yue Ming Sun et Chun Wei Yuan. « Preparation and Characterization of Polyimide/BaTiO3 Nanocomposite Films with Lower Infrared Emissivity ». Key Engineering Materials 326-328 (décembre 2006) : 1749–52. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1749.

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The silicon-containing polyimide/BaTiO3 nanocomposite films were prepared by mixing the silicon-containing poly(amic acid) based on bis(3,4-dicarboxyphenyl)dimethylsilane dianhydride and 4,4'-Oxydianiline with BaTiO3 nanoparticles, followed by thermal imidization. Structure and properties of the nanocomposite films were measured with FTIR, SEM, XPS and DMTA. The results indicated that the interfacial interaction between BaTiO3 nanoparticles and the silicon-containing polyimide was conspicuous, and that BaTiO3 nanoparticles appeared to be better dispersed in the polyimide matrix at a higher BaTiO3 concentration than at a lower one. The siliconcontaining polyimide/BaTiO3 nanocomposite films exhibited higher storage modulus and glass transition temperature than the original polyimide. It was also found that the infrared emissivity of the nanocomposite films varied with the content of BaTiO3 in the nanocomposites, and the nanocomposite films exhibited lower infrared emissivity value than the corresponding polyimide by measure of infrared emissivity.
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Jokar, Maryam, Russly Abdul Rahman et Luqman Chuah Abdullah. « Physical and Antimicrobial Characterization of Self Assembled Silver Nanoparticle/Chitosan onto Low Density Polyethylene Film as Active Packaging Polymer ». Journal of Nano Research 27 (mars 2014) : 53–64. http://dx.doi.org/10.4028/www.scientific.net/jnanor.27.53.

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Colloidal Silver nanoparticles with a size of 5 nm produced by chemical reduction using poly ethylene glycol (PEG 200). Layers of silver nanoparticles and chitosan were deposited onto low density polyethylene (LDPE) substrate by layer by layer (LBL) self-assembly technique. Silver nanocomposite films were built by sequential dipping of LDPE film in either anionic silver nanoparticles or cationic chitosan. Silver nanoparticles and chitosan led to the formation of nanocomposite films possessing antimicrobial properties with the thickness of 2, 4, 8, 12 and 20 layers. Silver nanocomposite films were characterized by atomic force microscopy (AFM). Thermal, mechanical and barrier properties of LBL deposited nanocomposite films were investigated. Results showed that the LBL deposition of silver nanoparticles and chitosan increased the crystallinity of the composites and also improved mechanical and barrier properties of LDPE film significantly (p<0.05). Antimicrobial activity of silver nanocomposites againstEscherichia coliandStaphylococcus aureuswas evaluated. Growth kinetic parameters ofE.coliandS.aureusaffected by silver nanocomposites were calculated by modeling of absorbance data according to Gomperz equation. LDPE-silver nanocomposite affected bacterial growth parameters significantly (p<0.05). The specific growth rate reduced from 0.30 to 0.11 h-1forE. coliand decreased 0.27 to 0.06 h-1forS. aureus.
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Arshad, Adillah Nurashikin, Rozana Mohd Dahan, Mohamad Hafiz Mohd Wahid, Zulkefle Habibah, Nyl Ismail Lyly, Muhamad Naiman Sarip et Rusop Mahmood Mohamad. « The Study of the Surface Morphology of PVDF/MgO Nanocomposites Thin Films ». Advanced Materials Research 626 (décembre 2012) : 311–16. http://dx.doi.org/10.4028/www.scientific.net/amr.626.311.

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This study investigates the effect of varying loading percentages of MgO on the topography and morphology of Poly (vinylideneflouride)/Magnesium Oxide (PVDF/MgO) nanocomposites thin films. PVDF/MgO nanocomposites spin coated thin films with thicknesses ranging from 200nm to 456nm were successfully characterized. The nanocomposite solutions were spin coated on Al-glass substrates at 1500rpm. The topography and surface roughness of PVDF/MgO nanocomposites were characterized by using AFM. FE-SEM was used to investigate the surface morphology of the nanocomposites thin films and ATR-FTIR was used to determine the chemical bonding of PVDF/MgO nanocomposites. MgO (7%) was found to be the optimum loading percentage for PVDF/MgO nanocomposite film with favorable distribution of MgO particles, minimum defects and high content of β-phase as evident by FESEM and FTIR.
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Abdul Ghani, Siti Waqina, Aznizam Abu Bakar et Sani Amril Samsudin. « Mechanical Properties of Chitosan Modified Montmorillonite Filled Tapioca Starch Nanocomposite Films ». Advanced Materials Research 686 (avril 2013) : 145–54. http://dx.doi.org/10.4028/www.scientific.net/amr.686.145.

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This study was carried out to develop renewable and degradable plastics film with good mechanical properties. The mechanical properties between compatibilized montmorillonite (MMT)/chitosan filled tapioca starch (TPS), uncompatibilized MMT/TPS, and chitosan/TPS nanocomposite films were investigated. Experimental works were started with the extraction of local chitosan from chitin derived from prawn shells which involving deprotenization, demineralization and deacetylation treatments. Degree of deacetylation of chitosan was determined using infrared spectroscopy method. Chitosan was acted as compatibilizer between MMT and starch in order to improve the dispersion of MMT in nanocomposite systems. Nanocomposite films were prepared using a solution casting method with addition of glycerol as the plasticizer. The starch solution was cast onto PTFE mold with cavity thickness of 0.5mm. Characterizations of the nanocomposite films were done using Fourier Transform Infrared Analysis (FTIR). Tensile properties of nanocomposites were investigated. The compatibilized nanocomposite films, chitosan/MMT/TPS give significant effects to tensile properties. Chitosan has played its role as the compatibilizer and also as flexibility improvers to nanocomposite films because elongation at break improved after addition of chitosan.
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Thèses sur le sujet "Films nanocomposite"

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Sababi, Majid. « Nanocomposite films for corrosion protection ». Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-132240.

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This thesis describes technical and scientific aspects of new types of composite films/coatings for corrosion protection of carbon steel, composite films with nanometer thickness consisting of mussel adhesive protein (Mefp‐1) and ceria nanoparticles, and polymeric composite coatings with micrometre thickness consisting of conducting polymer and ceria nanoparticles in a UV‐curing polyester acrylate (PEA) resin. The influence of microstructure on corrosion behaviour was studied for a Fe‐Cr‐V‐N alloy containing micro‐sized nitrides with different chemical composition spread in martensitic alloy matrix. The Volta potential mapping suggested higher relative nobility for the nitride particles than the alloy matrix, and the nitrides with higher amounts of nitrogen and vanadium exhibited higher nobility. Potentiodynamic polarization measurements in a 0.1 M NaCl solution at neutral pH and ambient temperature showed passivity breakdown with initiation of localized corrosion which started in the boundary region surrounding the nitride particles, especially the ones enriched in Cr and Mo. Mefp‐1/ceria nanocomposite films were formed on silica and metal substrates by layer‐by‐layer immersion deposition. The film formation process was studied in situ using a Quartz Crystal Microbalance with Dissipation (QCM‐D). The film grows linearly with increasing number of immersions. Increasing Mefp‐1 concentration or using Mefp‐1 with larger size leads to more Mefp‐1 being deposited. Peak Force Quantitative Nanomechanical Mapping (Peak Force QNM) of the composite films in air indicated that the elastic modulus of the film increased when the film deposited had a higher Mefp‐1 concentration. It was also noted that the nature of the outermost layer can affect bulk morphology and surface mechanical properties of the film. The QCM‐D study of Mefp‐1 on an iron substrate showed that Mefp‐1 adsorbs at a high rate and changes its conformation with increasing adsorption time. The QCM‐D and in situ Peak Force QNM measurements showed that the addition of Fe3+ ions causes a transition in the single Mefp‐1 layer from an extended and soft layer to a denser and stiffer layer. In situ ATR‐FTIR and Confocal Raman Microscopy (CRM) analyses revealed complex formation between Fe3+ and catechol groups in Mefp‐1. Moreover, optical microscopy, SEM and AFM characterization of the Mefp‐1/ceria composite film formed on carbon steel showed micron‐size aggregates rich in Mefp‐1 and ceria, and a nanostructure of well dispersed ceria particles in the film. The CRM analysis confirmed the presence of Mefp‐1/Fe complexes in the film. Electrochemical impedance microscopy and potentiodynamic polarization measurements showed that the Mefp‐1/ceria composite film can provide corrosion protection for carbon steel, and that the protection efficiency increases with exposure time. Composite coatings of 10 μm thickness composed of a UV‐curing PEA resin and a small amount of conductive polymer and ceria nanoparticles were coated on carbon steel. The conductive polymer (PAni) was synthesized with phosphoric acid (PA) as the dopant by chemical oxidative polymerization. The ATR‐FTIR and SEM analyses confirmed that the added particles were well dispersed in the coatings. Electrochemical measurements during long exposure in 0.1 M NaCl solution, including open circuit potential (OCP) and EIS, were performed to investigate the protective performance of the coatings. The results showed that adding ceria nanoparticles can improve the barrier properties of the coating, and adding PAni‐PA can lead to active protection of the coating. Adding PAni‐PA and ceria nanoparticles simultaneously in the coating can improve the protection and stability of the composite coating, providing excellent corrosion protection for carbon steel.

QC 20131024

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Kurt, Mustafa Şükrü. « Nanocomposite magnetic films assembled from nanoparticles ». Thesis, University of Leicester, 2016. http://hdl.handle.net/2381/38122.

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This thesis consists of three main investigations. The first of these is a study of the magnetic properties of Fe nanoparticles embedded in an Al matrix, with different volume fraction. Both Fe nanoparticles, with a diameter of ̴ 2 nm, and the Al matrix were deposited from the gas phase. The atomic Fe moment of the Fe nanoparticles in Al is much less than the bulk Fe value because of considerable alloying at the Fe nanoparticle and Al matrix interface. Two important parameters, the exchange field (Hex) and random anisotropy field (Hᵣ), were investigated using the Random Anisotropy Model (RAM). Fitting the data to this model reveals that with increasing volume filling fraction (VFF) of Fe nanoparticles in Al, both Hex and Hr show an increase, with Hr showing a more significant increase than for Hₑₓ. The second main investigation in this thesis is a study of structure and magnetism in Co nanoparticles embedded in antiferromagnetic Cr. Co K edge and Cr K edge extended x-ray absorption fine structure (EXAFS) experiments were performed in order to investigate atomic structure in the Cr-embedded Co nanoparticles and Cr matrix respectively, whereas magnetism was investigated using a vibrating sample magnetometer (VSM). The atomic structure of the Co nanoparticles is same as the host Cr matrix (bcc), although with a degree of disorder, rather than the bulk Co hcp structure. The net Co moment per atom in the Co/Cr nanocomposite films is significantly lower than bulk Co value, and decreases as the proportion of Co nanoparticles in the film is decreased; for the sample with the most dilute concentration of Co nanoparticles (4.9% by volume), the net Co moment was 0.18 μB/atom. Both the structural and magnetic results show that there is a degree of alloying at the nanoparticle/matrix interface, leading to a core/shell structure in the embedded nanoparticles consisting of an antiferromagnetic CoCr alloy shell surrounding a reduced ferromagnetic Co core. The final part of this work is an investigation into the structure and magnetism of Fe nanoparticles embedded in a Cu1-ₓAlₓ alloy matrix, where the structure of the matrix could be controlled by control over its composition. Cu K edge EXAFS measurements show that there is a slight stretch in the Cu-Cu interatomic distances in the alloy matrix, while the face centred structure in the Cu1-ₓAlₓ matrix is maintained, as the Al-content is increased. Fe K edge EXAFS measurements reveal that for low Al-content in the Cu1-ₓAlₓ matrix, Fe nanoparticles have both fcc and bcc structures, but for higher Al-content the structure of Fe nanoparticles is consistent with bcc. The magnetism measurements, obtained from VSM and SQUID magnetometers, show that the Fe atomic moment increases sharply due to the increasing proportion of bcc Fe nanoparticles. However for Al-content higher than 0.13, the net atomic moment value of Fe decreases slightly, which is consistent with a high degree of alloying between Fe and Al atoms.
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Jareño, Cerulla Júlia. « Transient liquid assisted growth of superconducting nanocomposite films ». Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/670580.

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Els materials superconductors d’alta temperatura tenen propietats úniques, objecte d’investigació des de fa molts anys, especialment les propietats relacionades amb la conductivitat sense resistència a temperatures relativament altes o sota camps magnètics alts. Existeix un gran esforç a nivell internacional per optimitzar les propietats d’aquests materials i desenvolupar metodologies pel seu creixement que siguin compatibles amb la producció a gran escala i baix cost. En aquest context, els resultats inclosos en aquesta tesi són un important pas endavant, ja que demostren per primera vegada la possibilitat d’utilitzar la millora de propietats superconductores aconseguida amb tecnologia de nanocompòsits combinada amb una metodologia de creixement basada en la deposició de solucions químiques i intermedis líquids que presenta un baix cost i alt rendiment. El creixement de l’YBa2Cu3O(7-x) s’ha dut a terme mitjançant una nova metodologia anomenada “creixement assistit per líquid transitori” (TLAG per les seves sigles en anglès), la qual combina el baix cost  de la deposició de solucions químiques amb la presència d’un líquid transitori que proveeix velocitats de creixement ultra-ràpides. Hem aconseguit combinar aquest creixement a través de fases líquides amb la presència de nanopartícules a través de l’estudi de la nucleació, la micro-estructura i la disposició de defectes en les nostres capes primes. Pels estudis de capes nanocompòsites vam triar nanopartícules  de BaZrO3, BaHfO3 i LaF3, estabilitzades en medis alcohòlics. Els resultats presentats estan dividits segons les diferents rutes de creixement.En la ruta de temperatura, varis paràmetres han estat optimitzats amb l’objectiu d’aconseguir capes nanocompòsites epitaxials, tals com la rampa d’escalfament i el gruix de capes tampó d’YBCO sintetitzades a través de PLD. També presentem resultats amb diferents estequiometries de la fase líquida, elucidant la importància de controlar la sobresaturació per aconseguir capes epitaxials. La densitat de corrent crítica a 77K és 1MA/cm2. Hem demostrat que introduir nanopartícules al creixement d’YBCO per TLAG crea una estructura de defectes amb un gran potencial per millorar la fixació de vòrtexs sota camps magnètics. Hem investigat el creixement de capes nanocompòsites d’YBCO a través de la ruta de PO2 amb quantitats de BaZrO3 o BaHfO3 entre el 6% i el 32%. Hem descrit l’ús d’una capa prima precursora sense nanopartícules per tal d’aconseguir una bona reproductibilitat i capes nanocompòsites completament orientades en l’eix c en el cas de nanocompòsits amb 6% i 12% de nanopartícules. Hem demostrat una Jc de 2.2MA/cm2 a 77K, el qual és un resultat molt prometedor que ens ha portat a avaluar la Jc respecte camps magnètics aplicats. Hem pogut demostrar com les propietats dels nanocompòsits sota camp magnètic són millors que en les mostres estàndard, característica necessària per aplicacions de les cintes recobertes superconductores sota alts camps magnètics. Aquesta dissertació també inclou un estudi preliminar sobre el creixement de capes gruixudes d’YBCO (1um) i sobre la compatibilitat de capes tampó amb TLAG. Hem pogut demostrar la completa eliminació del carbonat de bari en capes de 1um de gruix, i hem aconseguit capes gruixudes completament epitaxials a través de la ruta de PO2. Hem fet servir el mètode de deposició de solucions químiques per créixer capes de Ba2342, Nd2CuO4, LaMnO3 (LMO), la reactivitat de les quals ha estat avaluada durant el creixement amb fases líquides. També s’ha estudiat la nucleació de YBCO a sobre d’aquestes capes tampó. El material més prometedor ha estat LMO, per tant hem utilizat substrats metàl·lics comercials amb LMO com a l’última de les capes tampó de la seva arquitectura. Hem aconseguit el creixement epitaxial de capes d’YBCO amb bona temperatura crítica a sobre d’aquestes capes, demostrant que la metodologia TLAG és compatible amb arquitectures comercial de capes recobertes superconductores.
Los materiales superconductores de alta temperatura tienen propiedades únicas, que han sido objeto de investigación des de hace muchos años, especialmente las propiedades relacionadas con la conductividad sin resistencia a temperaturas relativamente altas o bajo campos magnéticos. Existe un gran esfuerzo a nivel internacional para optimizar las propiedades de estos materiales y desarrollar metodologías para su crecimiento que sean compatibles con la producción a gran escala y bajo coste. En este contexto, los resultados incluidos en esta tesis son un importante paso adelante ya que demuestran por primera vez la posibilidad de utilizar la mejora de propiedades superconductoras conseguida con tecnología de nanocompuestos combinada con una metodología de crecimiento basada en la deposición de soluciones químicas e intermedios líquidos que presenta un bajo coste y alto rendimiento. El crecimiento de YBa2Cu3O(7-x) se ha hecho mediante una nueva metodología llamada “crecimiento asistido por líquido transitorio” (TLAG por sus siglas en inglés), la cual combina el bajo coste de la deposición de soluciones químicas con la presencia de un líquido transitorio que da velocidades de crecimiento ultra-rápidas. Hemos conseguido combinar este crecimiento a través de fases líquidas con la presencia de nanopartículas a través del estudio de la nucleación, la microestructura y la disposición de los defectos en nuestras capas delgadas. Para los estudios de capas nanocompuestas hemos elegido nanopartículas de BaZrO3, BaHfO3 y LaF3, estabilizadas en medios alcohólicos. Los resultados están divididos según las diferentes rutas de crecimiento. En la ruta de temperatura, varios parámetros han sido optimizados con el objetivo de conseguir capas nanocompuestas epitaxiales, tales como la rampa de calentamiento y el grosor de capas tampón de YBCO sintetizadas a través de PLD. También presentamos resultados con diferentes estequiometrias de la fase líquida, elucidando la importancia de controlar la sobresaturación para conseguir capas epitaxiales. La densidad de corriente crítica a 77K es 1MA/cm2. Hemos demostrado que introducir nanopartículas al crecimiento de YBCO a través de TLAG crea una estructura de defectos con un gran potencial para mejorar la fixación de vórtices bajo campos magnéticos. Hemos investigado el crecimiento de capas nanocompuestas de YBCO a través de la ruta de PO2 con cantidades de BaZrO3 o BaHfO3 entre el 6% y el 32%. Hemos descrito el uso de una capa delgada precursora sin nanopartículas con tal de conseguir una buena reproductibilidad y capas nanocompuestas completamente orientadas en el eje c en el caso de nanocompuestos con el 6% y el 12% de nanopartículas. Hemos demostrado una Jc de 2.2MA/cm2 a 77K, lo cual es un resultado muy prometedor que nos ha llevado a evaluar la Jc respeto campos magnéticos aplicados. Hemos podido demostrar como las propiedades de las capas nanocompuestas bajo campos magnéticos son mejores que en las muestras estándar, característica necesaria para aplicaciones de las cintas recubiertas superconductoras bajo altos campos magnéticos. Esta disertación también incluye un estudio preliminar sobre el crecimiento de capas gruesas de YBCO (1um) y sobre la compatibilidad de capas tampón con TLAG. Hemos podido demostrar la completa eliminación del carbonato de bario en capas de 1um de grosor. Hemos utilizado el método de CSD para crecer capas de Ba2342, Nd2CuO4, y LaMnO3 (LMO), la reactividad de las cuales ha sido evaluada durante el crecimiento con fases líquidas. El material más prometedor ha sido LMO, y por lo tanto hemos usado sustratos metálicos comerciales con LMO como última capa de su arquitectura. Hemos conseguido el crecimiento epitaxial de capas YBCO con buena temperatura crítica encima de estas capas, demostrando que la metodología TLAG es compatible con la arquitectura comercial de capas recubiertas superconductoras.
High temperature superconducting materials have unique properties which have been under investigation for many years, mainly involved with their zero resistance properties at high temperatures or at high magnetic fields. Currently, one of the main interest in the superconducting community is to demonstrate the applicability of these materials, in order to achieve the widespread use of their applications. As such, there is a big international effort on optimizing performances and developing growth methodologies compatible with big-scale production at low cost. In this context, the results presented in this thesis are an important step forward, reporting for the first time the possibility to use the increased superconducting properties of nanocomposite technology together with a low-cost and high throughput liquid-based methodology based on chemical solution deposition. The growth of YBa2Cu3O(7-x) } is performed by the newly reported method of transient liquid assisted growth (TLAG), which combines the inexpensive chemical solution deposition with the presence of a transient liquid that provides ultra-high growth rates. We have been successful in combining this liquid-based growth with the presence of nanoparticles through the understanding of nucleation, microstructure and defect landscape of our films. We have chosen BaZrO3, BaHfO3 and LaF3 pre-formed nanoparticles stabilized in alcoholic media for these studies. The results are divided by the different processing routes, presenting the efforts on optimizing the nucleation, growth and superconducting properties of nanocomposites in two chapters. The two different paths consist of the temperature route (heating at constant PO2), and PO2-route (heating at very low PO2 and then increasing PO2 to reach growth conditions). In the T-route, several parameters were optimized in order to achieve epitaxial nanocomposite films, such as heating ramp and the thickness of a PLD-YBCO buffer layer. Also different liquid stoichiometries were tested, revealing the importance of supersaturation control to achieve epitaxy. Jc is 1MA/cm2, and we demonstrated that introducing pre-formed nanoparticles to TLAG-YBCO creates a defect structure with a lot of potential towards improved vortex pinning. The growth of YBCO nanocomposites through the PO2-route with BaZrO3 and BaHfO3 molar percentages ranging from 6% to 32% was studied through XRD techniques which allow the quantification of different YBCO crystalline orientations. Introduction of a seed layer accomplished a better reproducibility and fully c-axis oriented epitaxial films for 6% and 12% nanocomposites. We demonstrated Jc self-field up to 2.2MA/cm2 at 77K, a very promising result, which led to the evaluation of Jc under applied magnetic fields through dc-SQUID and electrical transport measurements. Thus, we could show the increased performance of nanocomposites with magnetic field in comparison with pristine samples, necessary for high magnetic field applications of coated conductors. This dissertation also includes a preliminary study on the growth of YBCO thick films (1um) and buffer layer compatibility with TLAG. We demonstrated the successful elimination of barium carbonate in films up to 1um thick and fully epitaxial YBCO layers could be processed by the PO2-route. CSD methodologies were used to grow thin films of Ba2342, Nd2CuO4, LaMnO3 and La0.8Sr0.2MnO3, in order to evaluate the reactivity of the transient liquid with these materials as well as the nucleation of YBCO on top. LaMnO_3 (LMO) was found to be a very promising material and was further investigated by using PLD-grown LMO and SuNAM commercial tape with LMO as the last layer of their architecture. We achieved epitaxial YBCO films with good Tc on top of these buffers layers, demonstrating that TLAG is compatible with commercial coated conductors architecture.
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Dalacu, Dan. « Ellipsometric characterization of gold/dielectric nanocomposite films ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60932.pdf.

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Niu, Feng. « Functional nanocomposite thin-films by co-sputtering ». Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390504.

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Hinchcliffe, Claire. « Processing and properties of nanocomposite dielectric films ». Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437011.

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Teixeira, Roberto F. A. « Multi-layered nanocomposite polymer latexes and films ». Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/45871/.

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Clay platelets and silica nanoparticles are used as Pickering stabilizers in the fabrication of hybrid armored polymer particles through a Pickering emulsion polymerization process. A variety of hydrophobic comonomers (i.e., styrene-co- (n-butyl acrylate) (Sty:BA), methyl methacrylate-co-(n-butyl acrylate) (MMA:BA)), styrene-co-(2-ethyl hexyl acrylate) (Sty:2-EHA), vinyl acetate (VAc) and vinyl pivalate (VPiv) are used as organic film forming components. Polymerization kinetics and particle size distributions were examined as a function of monomer conversion. Additionally, key mechanistic features of the polymerization process by quantitatively analyzing the concentration of silica nanoparticles in the water phase during monomer conversion by disc centrifugation are unraveled. It is also showed the crucial role of Laponite clay discs in the particle formation (nucleation) of the Pickering emulsion polymerization process. Increasing amounts of clay nanodiscs leads to smaller average particles sizes, but broader particle size distributions. Polymer films of poly(styrene-co-n-butyl acrylate) armored with Laponite clay were studied as a function of clay amount. Improvements in mechanical, thermal and surface topography provided by clay platelets are reported. In addition, advantages are shown in use of hybrid polymer particles in comparison with simple blend mixtures of polymer particles plus inorganic particles. Humidity properties of poly(styrene-co-n-butyl acrylate) films as a function of clay content are investigated. It is demonstrated that the presence of Laponite clay improves the water storage capacity of polymer films. Also water barrier properties are improved when clay platelets are applied. Finally, a versatile two step Pickering emulsion polymerization for the fabrication of core-shell particles armored with Laponite clay XLS is developed. The obtained particles contain a "hard" core and a "soft" shell armored with clay. The different in the refractive indexes between the core and shell makes these core-shell particles interesting for possible use as colloidal crystals.
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Alzaid, Meshal Mufleh. « Flexible Nanocomposite Thin Films for Electronic Devices ». Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/29393.

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Electronic technology is moving towards flexible, durable, and smaller devices with multifunctional capability. To accelerate this movement, creating materials with outstanding properties is critical. Nanocomposites based on single wall carbon nanotubes (SWCNTs) have received considerable attention because of their unique mechanical and electrical properties. When SWCNTs are formed as a sheet, they provide large contact area and ease of control, especially when incorporated into a flexible format. However, when SWCNT films are adhered to an elastic substrate, there are challenges with their use in flexible electronics, such as a reduction Young?s modulus under deformation. SWCNT films can undergo plastic behavior at even a small strain because individual SWCNTs slide past each other in response to deformation. To address these challenges, a strain-induced elastic buckling instability for mechanical measurements (SIEBIMM) method was used to query SWCNT film mechanics. The buckling wavelength and the film thickness are two main factors that influence the mechanics of nanocomposite thin films adhered to elastomeric substrates. SWCNT films coated with a second nanomaterial, such as a polymer thin film or nanocrystals (NCs), have shown a significant enhancement in elasticity. The studies described in this dissertation demonstrate that polymer thin film can reduce the strain softening of SWCNT films, where both yield strain and Young?s modulus increase with the introduction of SWCNT-polymer layers. Specifically, the films started to exhibit a strong synergy between SWCNT and polymer at a film thickness of around 20 nm, which is attributed to the thickness approaching the characteristic interfacial width between the two materials. Both a ?passive? polymer thin film (for example, polystyrene-PS) and an ?active? polymer thin film, the conducting polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)(PEDOT:PSS), were investigated, spanning a bilayer to the bulk limit of SWCNT-polymer multilayers. In addition, ultrathin SWCNT films coated with colloidal NCs have also been investigated. We have utilized two approaches to coat SWCNT films with NCs: Langmuir-Blodgett (LB) and spray coating. Both Si and CdSe nanocrystals showed a roughly two-fold enhancement in film elasticity, which was attributed to an excluded volume effect that prevents the SWCNT rearrangement under an applied strain.
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Berndt, Markus. « Phase separation in carbon:transition metal nanocomposite thin films ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-26643.

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The structural evolution of carbon:transition metal (C:TM) nanocomposite thin films is investigated in two regimes: (i) surface diffusion governed regime occurring during the film growth and (ii) bulk diffusion dominated regime occurring during the post-deposition thermal annealing. C:V, C:Co, and C:Cu nanocomposite films were grown by ion beam co-sputtering. The influence of the metal type, metal content (15-40 at.%), substrate temperature (RT-500°C), and annealing temperature (300-700°C) on the structure and morphology of the composite is studied by the means of elastic recoil detection analysis, X-ray diffraction, transmission electron microscopy, and Raman spectroscopy. Vanadium (copper) is in carbidic (metallic) state in the whole temperature range of the study. In contrast, cobalt is in carbidic state up to 300°C and becomes metallic at higher growth temperatures. The nanoparticles in C:V films exhibit a globular shape at RT-500°C, whereas in C:Co and C:Cu films a growth transition from globular to elongated nanoparticles occurs around 300°C. The comparison of the Raman spectroscopy results from carbon reference and C:TM thin films shows that the presence of the metal during growth significantly enhances the formation of sixfold ring carbon clusters at temperatures as low as RT. The enhancement occurs independently of the nanoparticle size, shape, and phase, and metal content, and is related to processes taking place on the nanoparticle surface of the growing film rather than in the bulk. The degree of enhancement depends on the TM type and content. Post-deposition annealing of C:Co and C:Cu films at 700°C causes the metal segregation at the film surface, while no changes upon annealing occur in C:V films. In addition, cobalt brings about the carbon graphitization by a dissolution-diffusion-precipitation mechanism, similar to the metal-mediated crystallization of amorphous silicon or germanium. No graphitization upon annealing occurs in C:V, C:Cu, and carbon reference films
Die Strukturentwicklung in Kohlenstoff-Übergangsmetall-Nanokompositschichten wird in zwei Bereichen untersucht: (i) im oberflächendiffusionsgesteuerten Bereich während des Schichtwachstums und (ii) im bulkdiffusionsdominierten Bereich während des nachträglichen Temperns. C:V, C:Co und C:Cu Nanokompositschichten wurden durch Ionenstrahl Co-Sputtern hergestellt. Der Einfluss des Metalltyps, des Metallgehalts (15-40 at.%), der Substrattemperatur (RT-500°C) und der Temperatur beim Tempern (300-700°C) auf die Struktur und Morphologie des Komposits wird mittels elastischer Rückstoßteilchen-Analyse, Röntgenbeugung, Transmissionselektronenmikroskopie und Ramanspektroskopie untersucht. Vanadium (Kupfer) ist im gesamten Temperaturbereich der Studie in karbidischem (metallischen) Zustand. Im Gegensatz dazu befindet sich Kobalt bis zu einer Temperatur von 300°C in karbidischem Zustand und wird bei höheren Abscheidetemperaturen metallisch. Die Nanopartikel in C:V Filmen besitzen eine runde Form im Temperaturbereich von RT bis 500°C wohingegen bei den C:Co und C:Cu Filmen ein Übergang von runden zu länglichen Partikeln bei etwa 300°C zu beobachten ist. Der Vergleich der Ramanspektroskopieresultate der Kohlenstoffreferenzproben und der Nanokompositschichten zeigt, dass die Anwesenheit des Metalls während des Schichtwachstums die Bildung von sechsatomigen Kohlenstoffringclustern bei Temperaturen so niedrig wie Raumtemperatur deutlich fördert. Die Erhöhung tritt unabhängig von der Partikelgröße, -form und phase und unabhängig vom Metallgehalt auf, und betrifft eher Prozesse, die auf der Oberfläche der Nanopartikel während des Schichtwachstums stattfinden als im Bulk. Der Grad der Erhöhung hängt vom Metalltyp und -gehalt ab. Nachträgliches Tempern der C:Co und C:Cu Filme bei 700°C führt zur Segregation des Metalls an der Schichtoberfläche während in den C:V Filmen keine Veränderungen durch das Tempern auftreten. Des weiteren kommt es in den C:Co Filmen zur Graphitisierung des Kohlenstoffs durch einen „Lösungs-Diffusions-Ablagerungs“ Mechanismus ähnlich der metallvermittelten Kristallisierung in amorphem Silizium und Germanium. In den C:V, C:Cu und Kohlenstoffreferenzfilmen findet keine Graphitisierung während des Temperns statt
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Berndt, M. « Phase separation in carbon:transition metal nanocomposite thin films ». Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-61113.

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Livres sur le sujet "Films nanocomposite"

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Nanocomposite coatings and nanocomposite materials. Stafa-Zuerich : Trans Tech Publications, 2009.

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Gero, Decher, et Schlenoff Joseph B, dir. Multilayer thin films : Sequential assembly of nanocomposite materials. Weinheim : Wiley-VCH, 2003.

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Sam, Zhang, et Ali Nasar, dir. Nanocomposite thin films and coatings : Processing, properties and performance. London : Imperial College Press, 2007.

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Kazuhisa, Miyoshi, et NASA Glenn Research Center, dir. Sliding wear and fretting wear of DLC-based, functionally graded nanocomposite coatings. [Cleveland, Ohio] : National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Mele, Paolo, Tamio Endo, Shunichi Arisawa, Chaoyang Li et Tetsuo Tsuchiya, dir. Oxide Thin Films, Multilayers, and Nanocomposites. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14478-8.

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1954-, Nalwa Hari Singh, dir. Handbook of organic-inorganic hybrid materials and nanocomposites. Stevenson Ranch, Calif : American Scientific Publishers, 2003.

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Zhang, Sam. Biological and biomedical coatings : Processing and characterization. Boca Raton : Taylor & Francis, 2011.

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Zhu, Xingwen. ZnO bao mo zhi bei ji qi guang, dian xing neng yan jiu. 8e éd. Shanghai Shi : Shanghai da xue chu ban she, 2010.

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Zhang, Sam, et Nasar Ali. Nanocomposite Thin Films and Coatings. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2007. http://dx.doi.org/10.1142/p502.

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(Editor), Gero Decher, et Joe Schlenoff (Editor), dir. Multilayer Thin Films : Sequential Assembly of Nanocomposite Materials. John Wiley & Sons, 2008.

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Chapitres de livres sur le sujet "Films nanocomposite"

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Becker-Willinger, Carsten. « Nanocomposite Films ». Dans Sol-Gel Nanocomposites, 109–30. New York, NY : Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1209-4_5.

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Nasirpouri, Farzad. « Electrodeposited Nanocomposite Films ». Dans Electrodeposition of Nanostructured Materials, 289–310. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44920-3_7.

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Qing, Yongquan, et Changsheng Liu. « Multifunctional Superhydrophobic Nanocomposite Surface ». Dans Functional Thin Films Technology, 199–223. New York : CRC Press, 2021. http://dx.doi.org/10.1201/9781003088080-8.

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Jian, Rui, Joey Mead, Carol Barry et Claire Lepont. « Polymer Nanocomposites and Multilayer Nanocomposite Films by Coextrusion ». Dans Processing of Polymer Nanocomposites, 201–34. München : Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.3139/9781569906361.007.

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Jian, Rui, Joey Mead, Carol Barry et Claire Lepont. « Polymer Nanocomposites and Multilayer Nanocomposite Films by Coextrusion ». Dans Processing of Polymer Nanocomposites, 201–34. München, Germany : Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.1007/978-1-56990-636-1_7.

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Alsayed, Ahlam F. M., et Muhammad Aqeel Ashraf. « Synthesis of Polymer Nanocomposite Films ». Dans Handbook of Polymer and Ceramic Nanotechnology, 1–20. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-10614-0_9-1.

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Kanki, Teruo, et Hidekazu Tanaka. « Self-assembled Nanocomposite Oxide Films ». Dans Correlated Functional Oxides, 139–63. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43779-8_6.

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Alsayed, Ahlam F. M., et Muhammad Aqeel Ashraf. « Synthesis of Polymer Nanocomposite Films ». Dans Handbook of Polymer and Ceramic Nanotechnology, 157–76. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-40513-7_9.

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He, J., M. Ice et E. J. Lavernia. « Synthesis and Characterization of Nanocomposite Coatings ». Dans Nanostructured Films and Coatings, 131–48. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4052-2_11.

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KULISCH, WILHELM. « NANOCOMPOSITE THIN FILMS FOR BIOMEDICAL APPLICATIONS ». Dans Functional Properties of Nanostructured Materials, 493–504. Dordrecht : Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-4594-8_49.

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Actes de conférences sur le sujet "Films nanocomposite"

1

Sigamani, Nirmal Shankar, Zoubeida Ounaies et Henry Sodano. « Synthesis and Characterization of PVDF-Based SWNT/GO Hybrid Films ». Dans ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8021.

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Hybrid nanocomposites with single walled carbon nanotubes (SWNT) and graphene oxide (GO) as nanofillers and polyvinylidene fluoride (PVDF) as a polymer were synthesized as potential electronic active polymers (EAPs) with high breakdown strength. A co-solvent method was developed to achieve exfoliation and dispersion of GO in PVDF. The microstructure of the PVDF was found to be predominantly γ phase. Percent crystallinity of PVDF increased due to the addition of the hybrid nanofillers. And, at room temperature, the storage modulus is increased by 56.26% over the pure PVDF. The dielectric constant increased from ∼7 to ∼25 for the hybrid nanocomposites as compared to pure PVDF at 1KHz measurement frequency. Dielectric loss of the hybrid nanocomposite is found less than 0.6 for the frequency range from 20 Hz–1MHz. Electrical conductivity of the hybrid nanocomposite increase by nearly two orders of magnitude at 1KHz when compared to pure PVDF. The effect of the presence of these hybrid nanofillers on microstructure and properties of PVDF are discussed.
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FEDOROVICH, R. D., O. E. KIYAYEV, A. G. NAUMOVETS et P. M. TOMCHUK. « ELECTRONIC PROCESSES IN NANOCOMPOSITE FILMS ». Dans Reviews and Short Notes to NANOMEETING-2001. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812810076_0048.

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Mane, Anil U., et Jeffrey W. Elam. « Nanocomposite coatings by ALD : in-situ growth investigation and applications (Conference Presentation) ». Dans Nanostructured Thin Films IX, sous la direction de Tom G. Mackay, Akhlesh Lakhtakia et Motofumi Suzuki. SPIE, 2016. http://dx.doi.org/10.1117/12.2237810.

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Li, Hua, et Gang Li. « Computational Analysis of Strain Effects on Electrical Transport Properties of Crystalline Nanocomposite Thin Films ». Dans ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64641.

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In this work, we model the strain effects on the electrical transport properties of Si/Ge nanocomposite thin films. We utilize a two-band k·p theory to calculate the variation of the electronic band structure as a function of externally applied strains. By using the modified electronic band structure, electrical conductivity of the Si/Ge nanocomposites is calculated through a self-consistent electron transport analysis, where a nonequilibrium Green’s function (NEGF) is coupled with the Poisson equation. The results show that both the tensile uniaxial and biaxial strains increase the electrical conductivity of Si/Ge nanocomposite. The effects are more evident in the biaxial strain cases.
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Ballesteros, J. M., C. N. Afonso, J. Solis et R. Serna. « Laser Synthesis of Nanocomposite Cu:Al2O3 thin Films for Nonlinear Optical Switching ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cwf54.

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Metal nanocrystals embedded in dielectric matrices have been the subject of intense research during the last few years as promising candidates for all-optical switching applications. However, the lack of suitable techniques to produce these materials in waveguide configuration has hindered the use of nanocomposites in technological applications. Pulsed laser deposition (PLD) is a recently developed thin film technique that offers a new way to obtain and control the size and shape of the nanocrystals, thus introducing new possibilities to engineer the nonlinear optical parameters of the material. This work reports on the production of Cu nanocrystals embedded in amorphous Al2O3 matrix with a large nonlinear refractive index and a significantly reduced nonlinear absorption. The influence of the metal content and the measuring conditions on the nonlinear response of the nanocomposite films has been also analysed.
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Lozovski, V., M. Razumova et T. Vasiliev. « Light absorption of nanocomposite thin films ». Dans 2016 IEEE 36th International Conference on Electronics and Nanotechnology (ELNANO). IEEE, 2016. http://dx.doi.org/10.1109/elnano.2016.7493025.

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Lancok, A., J. Kohout, M. Miglierini, F. Fendrych, M. Klementová, J. Lancok, Jirí Tucek et Marcel Miglierini. « Study of Fe-Co Nanocomposite Films ». Dans MOSSBAUER SPECTROSCOPY IN MATERIALS SCIENCE—2010. AIP, 2010. http://dx.doi.org/10.1063/1.3473903.

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Kuznetsova, Iren E., Boris D. Zaitsev, Nikolai M. Ushakov, Igor D. Kosobudskii et Aleksander M. Shikhabudinov. « Acoustical characteristics of polymeric nanocomposite films ». Dans International Congress on Ultrasonics. Vienna University of Technology, 2007. http://dx.doi.org/10.3728/icultrasonics.2007.vienna.1340_kuznetsova.

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Garahan, Anna, Laurent Pilon, Juan Yin et Indu Saxena. « Optical Properties of Nanocomposite Thin-Films ». Dans ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13309.

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This paper aims at developing numerically validated models for predicting the through-plane effective index of refraction and absorption index of nanocomposite thin-films. First, models for the effective optical properties are derived from previously reported analysis applying the volume averaging theory (VAT) to the Maxwell's equations. The transmittance and reflectance of nanoporous thin-films are computed by solving the Maxwell's equations and the associated boundary conditions at all interfaces using finite element methods. The effective optical properties of the films are retrieved by minimizing the root mean square of the relative errors between the computed and theoretical transmittance and reflectance. Nanoporous thin-films made of SiO2 and TiO2 consisting of cylindrical nanopores and nanowires are investigated for different diameters and various porosities. Similarly, electromagnetic wave transport through dielectric medium with embedded metallic nanowires are simulated. Numerical results are compared with predictions from widely used effective property models including (1) Maxwell-Garnett Theory, (2) Bruggeman effective medium approximation, (3) parallel, (4) series, (5) Lorentz-Lorenz, and (6) VAT models. Very good agreement is found with the VAT model for both the effective index of refraction and absorption index. Finally, the effect of volume fraction on the effective complex index of refraction predicted by the VAT model is discussed. For certain values of wavelengths and volume fractions, the effective index of refraction or absorption index of the composite material can be smaller than that of both the continuous and dispersed phases. These results indicate guidelines for designing nanocomposite optical materials.
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Khodaparast, Payam, et Zoubeida Ounaies. « Preparation of TiO2 Polymer Nanodielectrics via a Solvent-Based Technique ». Dans ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3883.

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The effect of adding surface-functionally treated TiO2 nanoparticles on dielectric properties of PVDF matrix was investigated. Porosity of the nanocomposite films showed to have an impact on dielectric permittivity results. Thermal annealing was proposed as an effective way to overcome the porosity problem. By combination of surface treatment of particles and thermal annealing of nanocomposite films, considerable enhancement in dielectric permittivity of TiO2-PVDF nanocomposites was achieved. The experimental results were far higher than theoretical values based on Maxwell model, indicating the presence of an active interphase with high dielectric constant in the system.
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Rapports d'organisations sur le sujet "Films nanocomposite"

1

Goeke, Ronald S., Paul Gabriel Kotula, Somuri V. Prasad et Thomas W. Scharf. Synthesis of MoS2-Au nanocomposite films by sputter deposition. Office of Scientific and Technical Information (OSTI), juin 2012. http://dx.doi.org/10.2172/1055586.

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Potter, Jr, et Barrett G. Optoelectronic Nanocomposite Materials for Thin Film Photovoltaics. Fort Belvoir, VA : Defense Technical Information Center, juin 2012. http://dx.doi.org/10.21236/ada562250.

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Park, Chan E. Nanocomposite Gate Dielectrics With Nanoparticles for Organic Thin Film Transistors. Fort Belvoir, VA : Defense Technical Information Center, septembre 2006. http://dx.doi.org/10.21236/ada473096.

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Barnes, Eftihia, Jennifer Jefcoat, Erik Alberts, Hannah Peel, L. Mimum, J, Buchanan, Xin Guan et al. Synthesis and characterization of biological nanomaterial/poly(vinylidene fluoride) composites. Engineer Research and Development Center (U.S.), septembre 2021. http://dx.doi.org/10.21079/11681/42132.

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The properties of composite materials are strongly influenced by both the physical and chemical properties of their individual constituents, as well as the interactions between them. For nanocomposites, the incorporation of nano-sized dopants inside a host material matrix can lead to significant improvements in mechanical strength, toughness, thermal or electrical conductivity, etc. In this work, the effect of cellulose nanofibrils on the structure and mechanical properties of cellulose nanofibril poly(vinylidene fluoride) (PVDF) composite films was investigated. Cellulose is one of the most abundant organic polymers with superior mechanical properties and readily functionalized surfaces. Under the current processing conditions, cellulose nanofibrils, as-received and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) oxidized, alter the crystallinity and mechanical properties of the composite films while not inducing a crystalline phase transformation on the 𝛾 phase PVDF composites. Composite films obtained from hydrated cellulose nanofibrils remain in a majority 𝛾 phase, but also exhibit a small, yet detectable fraction of 𝛼 and ß PVDF phases.
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Marinov, Yordan G., et Georgi B. Hadjichristov. Electro-optical Characteristics of Thin Films of Aerosil-7CB Nematic Gel Nanocomposites Doped with Photoresponsive Liquid Crystalline Azo - compounds. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, octobre 2020. http://dx.doi.org/10.7546/crabs.2020.10.05.

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