Дисертації з теми "Textile nanoparticles"
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Panwar, Kamlesh. "Janus particles for textile applications." Thesis, IIT Delhi, 2016. http://localhost:8080/xmlui/handle/12345678/7219.
Повний текст джерелаWilhelm, Manon. "Development of SERS substrates of metal nanoparticles and textile fibers." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15336.
Повний текст джерелаNoble metallic nanostructures are well-known materials that present interesting physical and chemical properties, especially the surface plasmon resonance involved in the surface-enhanced Raman signal (SERS) of molecules adsorbed at the metal surface. Since its discovery, the SERS method is a highly studied analysis technique that allows detecting molecules at very low concentration. Numerous works are currently leaded to develop more efficient SERS substrates to lower the detection limit. Also, the development of more convenient substrates, eventually coupled with portable Raman technology is promising for the detection of low concentrated molecules in multiple domains, as for example the detection of dyes. This report presents the study of new nanocomposites with texile fibers for their use as SERS substrates. A literature review about natural fibers, metallic nanoparticles, nanocomposites and SERS technique will first be presented to contextualize this research. Then, several combinations of composites were prepared with natural fiber matrix of linen, silk or cotton. To prepare the nanocomposites, gold and silver nanoparticles were synthesized by the citrate method and have a mean size of respectively 14 nm and 86 nm. Then, three techniques of synthesis are used to produce the nanocomposites; namely the blending of fibers and metal colloids previously prepared, with and without modification of the fiber’s surface with polyelectrolytes, and the in situ synthesis of the particles in presence of the fibers. The nanocomposites were then characterized by several techniques such as scanning electron microscope, X-ray diffraction and optical measurements. The molecular probe used to evaluate the quality of the composites as SERS substrates was methylene blue (MB). This molecule has a strong SERS signal and is a dye frequently used in textile industry. Mapping studies of the composites were performed, using Raman confocal microscopy with MB as molecular probe. These studies allowed monitoring the distribution of the metallic nanoparticles at the fiber’s surface, as well as the presence of MB. The results showed that the detection of MB through this technique strongly depends on the type of nanocomposite, knowing that the composites with silver presented a better SERS signal of MB than the similar material with gold. Particularly, the composites of linen and silver presented very promising results as SERS substrates for the detection of MB.
As nanopartículas de prata e ouro são materiais que exibem propriedades físicas e químicas muito interessantes, nomeadamente as que se encontram associadas a efeitos de superfície como por exemplo na obtenção de espetros de Raman de moléculas adsorvidas na superfície de metais, originando sinais por intensificação por superfície (SERS: Surface-enhanced Raman scattering). Desde a sua descoberta, o efeito de SERS tem sido aproveitado em técnicas de análise e deteção de analitos em concentração muito baixa nas respetivas soluções. Um aspeto muito relevante em termos de desenvolvimento de novos materiais é a investigação de substratos mais eficientes para SERS. Além disso, o desenvolvimento de substratos mais convenientes, eventualmente acoplados a instrumentos de Raman portáteis é também promissor para a deteção de baixas concentrações de moléculas em múltiplas áreas, como por exemplo a deteção de corantes. Esta dissertação de Mestrado apresenta estudos em novos nanocompósitos à base de fibras têxteis e nanopartículas metálicas, tendo em vista a sua utilização como substratos para SERS. Primeiramente é apresentada uma revisão bibliográfica sobre fibras naturais, nanopartículas metálicas, nanocompósitos e a técnica de SERS, de modo a contextualizar o trabalho de investigação. Este envolveu numa primeira fase a preparação de nanocompósitos à base de fibras naturais, tais como o linho, a seda e o algodão. Utilizaram-se para o efeito nanopartículas coloidais de Au e Ag obtidas pelo método de citrato, com tamanho médio de 14 e 86 nm, respetivamente. Seguidamente, exploraram-se três técnicas preparativas para obter os nanocompósitos, nomeadamente a mistura das fibras e os coloides metálicos previamente preparados, com e sem modificação prévia da superfície das fibras com polieletrólitos e, ainda, a síntese in situ das nanopartículas na presença das fibras. Os nanocompósitos foram caracterizados por diversas técnicas, tais como microscopia eletrónica de varrimento, difração de raio-X e espetroscopia eletrónica. Em particular, realizaram-se estudos detalhados de espetroscopia de Raman explorando o efeito de SERS e usando o azul de metileno (MB) como analito. Esta molécula origina um sinal de SERS intenso sendo um corante frequentemente utilizado na indústria têxtil. Realizaram-se ainda estudos pioneiros no mapeamento destes materiais, usando o MB como sonda molecular, utilizando microscopia confocal de Raman. Estes estudos permitiram igualmente investigar a distribuição das nanopartículas metálicas na superficie das fibras bem como a presença do MB. Os resultados indicaram que a deteção de MB por esta técnica depende fortemente do tipo de nanocompósito, sendo que os nanocompósitos contendo prata apresentaram melhor sinal de SERS para a deteção do MB em comparação com os materiais análogos de ouro. Em especial, os nanocompósitos de linho e prata originaram resultados muito promissores como substratos de SERS na deteção do MB.
Messaoud, Mouna. "Fonctionnalisation anti-bactérienne passive ou active de tissus textiles par voie sol-gel ou photochimique - L'association du TiO2 et de la chimie douce." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00584376.
Повний текст джерелаGao, Weihong. "The fabrication of structurally coloured textile materials using uniform spherical silica nanoparticles." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/the-fabrication-of-structurally-coloured-textile-materials-using-uniform-spherical-silica-nanoparticles(c2815c09-5353-4667-a1a3-1b31b62f8787).html.
Повний текст джерелаQuinsac, Axelle. "Effets innovants sur la soie par résonance plasmon de particules d'or." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10198/document.
Повний текст джерелаThe purpose of this study is to develop innovative effects on silk due to plasmon resonance. For this, different synthesis pathways of pure gold nanoparticles and alloys with other noble metals have been considered: preliminary syntheses of nanoparticles through already known methods, followed by their incorporation on silk; and an in situ synthesis of nanoparticles directly on the silk. This second approach allowed us to identify two interesting effects: first, an iridescent effect of the dye (color change depending on the observation angle), due to the simultaneous formation on silk of plasmonic light-absorbing nanoparticles and light-reflective metal aggregates; second, an effect of concentrations addition by the pastes’ re-impression to achieve overlaying and gradient effects interesting for the industrial partners. After the preparation, storage and printing parameters’ study, the feasibility of such a process in industry and the reproducibility of the results have been validated. Some adjustments still need to be made in the case of a future industrialization
Motay, Marvin. "Multifunctional photocatalytic substrates and textiles constructed via Layer-by-Layer self-assembly of Ag and TiO2 nanoparticles." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF030/document.
Повний текст джерелаTiO2 and Ag nanoparticle multilayered films were constructed on model substrates and textiles via Layer-by-Layer (LbL) assembly. The TiO2 nanoparticle based films constructed on model substrates showed a non-conventional photocatalytic behaviour for gas phase formic acid mineralisation upon UV-A irradiation, and a high mineralisation was obtained for a single layer TiO2 nanoparticle film. These films also showed biocidal properties upon UV-A irradiation. The elaboration of a one-pot method, combining the photo-induced synthesis of Ag nanoparticles and the LbL deposition of TiO2 nanoparticle layer, allowed the direct synthesis of Ag nanoparticles within the films and a high enhancement of the film photocatalytic properties. The construction methods were successfully transfered on textile surfaces. The films were photocatalytically active and biocidal under UV-A irradiation after several washing treatment cycles
Singh, G. "Antibacterial activity testing of cotton medical textiles sonochemically impregnated with metal oxide nanoparticles." Thesis, Coventry University, 2014. http://curve.coventry.ac.uk/open/items/edeb833b-a792-49eb-bc22-bafbd374bb22/1.
Повний текст джерелаSolomon, Meron. "Enhancing the durability of fluorocarbon-free Durable Water Repellant (DWR) formulation." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-213517.
Повний текст джерелаVílchez, Maldonado Silvia. "Textiles funcionales obtenidos a partir de la incorporación de nanopartículas poliméricas." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/283167.
Повний текст джерелаThe main objective of this thesis is the design of ethylcellulose nanoparticles for use as vehicles of lipophilic active substances and their deposition on fabric, to obtain functional textiles. For this purpose, it was selected as a model substance a lipophilic organic sunscreen and cotton fabric as textile. Due to the characteristics of the selected lipophilic substance, the final goal is to obtain UV protective cotton fabric. The main stages of this thesis are: - The preparation of ethylcellulose (EC) nanoparticles loaded with a sunscreen from oil in water nano-emulsions used as templates by the solvent evaporation method. - The application of EC nanoparticles on cotton fabric - The determination of the properties of the textile treated with the nanoparticles Following, the main conclusions of this work are described: - Nano-emulsions studied show sufficient stability to be used as template for the preparation of EC nanoparticles using the solvent evaporation method. - The determination of the concentration of sunscreen in nanoparticles by HPLC allow to conclude that the evaporation process of the solvent does not induce diffusion of sunscreen to the continuous phase (encapsulation efficiency > 95 % ). - The incorporation of the crosslinker Desmodur N100 in the oil phase of the nano-emulsion allows obtaining nanoparticles insoluble in organic solvents such as ethanol. - Characterization of treated fabrics showed that conventional fabric finishing methods "impregnation-padding-drying " are suitable to provide UV protection to fabric. - Evaluation of the properties of protection against UV radiation of the treated fabrics indicates that various modifications to the process of deposition of nanoparticles on the cotton fabric have improved fabric UV properties (UPF = 50+). - Results suggest that cotton textile UV protection is caused by nanoparticles (UVB absorption) and optical whitening agent deposition from detergent used in washing (UVA absorption).
Dominguez, Kimberly. "Leaching of Silver Nanoparticles from Textiles." Ohio University Art and Sciences Honors Theses / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ouashonors155690445799457.
Повний текст джерелаLi, Dapeng. "Coloration of textiles with nanoparticle pigments /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Повний текст джерелаSchaefer, Sébastien. "Effets du dopage d'adsorbants nanoporeux par des métaux ou des semi-métaux nanodispersés sur leurs performances en stockage d'hydrogène par sorption." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0123/document.
Повний текст джерелаIn this PhD work, microporous carbonaceous materials decorated with metallic nanoparticles were developed in order to study the effect of nanodispersed metals on hydrogen sorption properties. Bio-sourced precursors such as sucrose, mimosa tannins or even rice straw have been used in order to promote eco-friendly, sustainable and innovating ways of synthesis. The use of hydrothermal pretreatment on tannins or sucrose allowed obtaining hydrochars that have been chemically or physically activated. Depending on synthesis parameters, these syntheses allowed to produce materials with controlled porosity. Then, the hydrogen adsorption properties of these materials were evaluated at ambient temperature as well as their textural properties. The main interest of this work was to propose a coupling between hydrogen sorption properties, from low to high pressure, and the textural properties. The textural properties were modelized using theoretical tools such as the DFT (Density Functionnal Theory). The use the different precursors and of decoration steps using supercritical carbon dioxide or hydrothermal synthesis, during which ones metallic or nitrogen containing precursors were used, allowed to obtain nickel, nitrogen or silicon doped materials without using harmful organic solvents. Finally, the decorrelation of the different adsorption contributions gave the possibility to detect and quantify the hydrogen fractions engaged in different processes such as physisorption, chemisorption and spillover. Polarized or enhanced physisorption was also detected using the same methods
Dastjerdi, R., F. A. Sadrabadi, and S. Bahrizadeh. "Polysiloxane Sheltered Nanoparticle-Containing Intercalated Nanolayers." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35374.
Повний текст джерелаMomin, Nasar, and nasarhm@gmail com. "Chitosan and improved pigment ink jet printing on textiles." RMIT University. Fashion and Textiles, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20081029.154501.
Повний текст джерелаHardian, Rifan. "Interplay between structure, texture, and reactivity in MOFs in the case of amorphous, defective, and composite materials." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0419/document.
Повний текст джерелаMetal-organic frameworks (MOFs) are a class of porous materials that constructed from metal clusters connected with organic linkers. The main objective of my PhD was to characterize the texture, structure, and reactivity of MOFs materials with a particular focus on defective, amorphous and composite materials. The first study is centered on the properties of the Fe-BTC family and this work was realized in collaboration with Utrecht University and the University of Oxford. A comparative study between crystalline MIL-100(Fe) and its commercial counterpart amorphous Basolite F300 (BASF) were studied by using methanol adsorption to predict the reactivity. Other characterization methods are introduced to investigate both materials which were further tested to be used as supports for metal-impregnation. In the next study, ball-milling was employed as a post-synthesis strategy for MOF modification. This ZIF-8 material was selected since it is commercially available (Basolite Z1200) and is becoming one of the reference materials in this area. Extensive studies including flexibility, textural, structural, as well as reactivity of different milling products is presented. Zirconium-based MOFs (UiO-66 and MOF-808) were also examined in this thesis. These studies were performed in collaboration with TU Munich. UiO-66 series containing engineered defects are first examined. We demonstrated that vapor adsorption measurement is a valuable tool to access the chemistry of the defects. The second studied system is MOF-808 series, where a comprehensive study is presented starting from synthesis strategies of defective and composite MOFs up to adsorption properties and reactivity
Dan, Chengyi. "Effects of nanoparticles on the microstructure and crystallographic texture evolution of two Aluminium-based alloys." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS147.
Повний текст джерелаThe effects of shearable and non-shearable nanoparticles on the microstructure and crystallographic texture evolution of two Al-based alloys after cold rolling have been studied in this thesis. An Al-Sc alloy containing shearable Al3Sc nanoprecipitates and Al-TiB2 composite containing non-shearable TiB2 nanoparticles are investigated, respectively. Transmission electron microscopy (TEM), electron backscatter diffraction (EBSD) and neutron diffraction texture analysis are employed to characterize the microstructure and texture development of the two alloys during cold rolling.Dynamic recovery has been inhibited in the matrix containing both shearable (Al3Sc) and non-shearable (TiB2) nanoparticles due to the pinning effects. Hence, few dislocation cells are generated in these matrices that impedes the grain refinement.The development of rolling texture is retarded by either shearable nanoprecipitates or non-shearbale particles. Obvious residual Cube orientation bands are found in materials containing shearable precipitates at the deformed states due to the limitation of cross-slip. Volume reduction of rolling texture components occurs in materials containing large non-shearable particles (about 1 micrometer) due to the recrystallization at PDZs (Particle Deformation Zones), which contributes to grain refinement.In addition, the shearing of nanoprecipitates promotes planar slip leading to strong strain localization and the occurrence of shearbands. The generation of shearbands is orientation dependent and results from the sudden change of deformation paths and inhibition of dynamic recovery. The non-shearable nanoparticles probably have rotated together with the surrounding matrix, which could be a new deformation mechanism
Lillie, John. "Mesoporous silica nanoparticle incorporation of essential oils onto synthetic textiles for tailored antimicrobial activity." Thesis, Manchester Metropolitan University, 2016. http://e-space.mmu.ac.uk/608777/.
Повний текст джерелаMmelesi, Olga Kelebogile. "Synthesis and characterization of pine cone carbon supported iron oxide catalyst for dye and phenol degradation." Thesis, Vaal University of Technology, 2017. http://hdl.handle.net/10352/418.
Повний текст джерелаFenton oxidation is classified into two processes, homogeneous and heterogeneous. Homogeneous Fenton oxidation process, have been shown to be efficient in the degradation of organic pollutants. However, it was shown to have limitations which can be addressed by the heterogeneous Fenton oxidation. Despite the high efficiency of the heterogeneous Fenton oxidation process in the degradation of recalcitrant organic pollutants, the currents synthesis trends of the heterogeneous Fenton catalyst have been proven to be time and energy constraining, since it involves the multi-step were the activated carbon have to be prepared first then co-precipitate the iron oxide on the activated carbon. However, as much as the heterogeneous Fenton catalyst has been proven to have high catalytic activity towards degradation of organic pollutants, these catalysts have some limitations, such limitations include metal ions being leached from the catalyst support into the treated water causing catalyst deactivation and a secondary pollution to the treated water. In this thesis, these catalysts have been applied in the degradation of recalcitrant organic pollutants such as methylene blue and phenols. This study focuses on the single step synthesis of iron oxide nanoparticles supported on activated carbon, were carbonaceous material is impregnated with iron salt then pyrolysed via microwave heating. Microwave power and the amount of iron salt were optimized. The prepared activated carbon-iron oxide composites were applied to the degradation of 2-nitrophenol (2-NP) and methylene blue (MB). Methylene blue was used as a model compound due to the fact that it is easier to monitor the degradation process with UV-Vis as compared to 2-nitrophenol . 2-nitrophenol the additional step for the adjustment of pH is required since nitrophenols are colorless in color at lower pH. The characterization showed that the microwave power and the amount of the iron precursor have an influence on the porosity and surface functional groups of the activated carbon. Further it was vi observed that microwave power and iron precursor influnces the amount of iron oxide formed on the surface of the support. It was also observed that the activated carbon-iron oxide composite have the catalytic effects on the Fenton oxidation process of MB and 2-NP. The parameters such as H2O2, pH, catalyst dose, initial concentration, temperature affect the degradation of both MB and 2-NP. Kinetics studies showed that Fenton is a surface driven reaction since the results fitted the pseudo first order model. The thermodynamics parameters also showed that the reaction is endothermic, spontaneous and is randomized. This implies that the reaction of the degradation of MB and 2-NP is feasible and the catalysts prepared have high catalytic activity. MB and 2-NP were degraded to smaller organic molecules (carboxylic acids). The stability of the catalyst observed to decrease as the number of cycles increased, this is due to the leaching of iron ions from the support material. Hence it was concluded that the activated carbon-iron oxide composite was successfully synthesized and had the high catalytic activity for the degradation of MB and 2-NP.
Twardoch, Marek. "Layer-by-layer modification of textiles : development of self-decontaminating functionalized textiles." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE008.
Повний текст джерелаPhotocatalysis can be efficiently utilized for obtaining self-decontaminating properties of different surfaces. Production of sun driven self-decontaminating textiles can highly improve level of hygiene, especially in undeveloped countries. To prepare coatings on textiles, the Layer-by-Layer assembly method seems to be very attractive as it allows to build multifunctional hybrid materials with controlled nanoscale composition and architecture, regardless of surface type and geometry. This work describes the preparation of photocatalytically active coatings composed of TiO2 nanoparticles and polyelectrolytes for self-decontaminating applications. The quantity of deposited catalysts within the films can be precisely controlled by adjusting the number of layers and the deposition parameters. Coated textiles showed promising results in degradation of dyes and gas pollutants. In order to better understand degradation mechanisms, radical production in films during illumination have been investigated by EPR spectroscopy
Le, Hoai Nga [Verfasser], Gianaurelio [Gutachter] Cuniberti, Michael [Gutachter] Stintz, and Sven [Gutachter] Wießner. "A concept for nanoparticle-based photocatalytic treatment of wastewater from textile industry / Hoai Nga Le ; Gutachter: Gianaurelio Cuniberti, Michael Stintz, Sven Wießner." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1226430562/34.
Повний текст джерелаBinotto, Ghislain. "Poudres d’oxydes de métaux de transition à texture, morphologie et taille contrôlées : de l’électrochimie à la catalyse." Amiens, 2008. http://www.theses.fr/2008AMIE0127.
Повний текст джерелаThe Li-ion battery technology is so far the best candidate to match the growing demand for portable and automotive power sources. The recent focus on nanomteric electrode materials for Li-ion cells leads us to consider Co3O4 precipitated in aqueous solution (Co3O4-P). This material is made of crystallized nanometric particles (40 Å), forming porous micrometric agglomerates exhibiting a very narrow porosity distribution. A structural investigation shows a partial cationic delocalization in 16c and 48f sites, in an extent inversely proportional to the size of the coherent domains. The powder texture is maintained, and therefore the optimum electrochemical performances, are obtained through the oxide/carbon mixing in suspension in a solvent. A capacity of more than 600 mAh/g is reached along twenty cycles. The first cycle irreversible capacity is equivalent to that of micrometric materials, suggesting that the formatting step is not responsible for this irreversibility, partially attributed to the formation of -CoO. The drop in capacity along cycling is mostly due to the dissolution of the active material in the electrolyte, and to the effects of the irreversible decomposition of the solvent. Different kinetic decomposition tests (NH3, toluene, H2O2, CO) demonstrated the catalytic efficiency of Co3O4-P. Preliminary catalytic and electrochemical results for Co3O4-P and post-annealed materials as catalysts in Li/O2 batteries, mainly regarding the lowering of the cell polarization, let us consider this set of materials as an ideal tool for bridging the electrochemistry and catalysis domains
Massella, Daniele. "Preparation of biofunctional textiles by surface functionalization based on the nanoencapsulation technique." Thesis, Lille, 2020. http://www.theses.fr/2020LILUI077.
Повний текст джерелаThis study was performed in the frame of the SMD-Tex Joint Doctorate project. The doctoral research activities were carried out in three mobility periods at POLITO (Italy), Ensait (France), and University of Soochow (China). This work aims to propose novel approaches for the production of biofunctional textiles. These products consist of textile fabrics which underwent special finishing treatments to confer properties that display beneficial effects to the user's health.In the last decades, pharmaceutical research has been investigating novel and more effective tools to administer a drug to the patient. The scope of these studies is to provide effective therapeutic dosages over a long time, minimizing the number of required administrations and the possible side effects. In this context, the skin has been regarded as a potential route for the release of local and systemic drugs. Such an approach is simpler and less invasive compared to other routes. Therefore, several strategies have been developed to effectively deliver drugs across the skin barrier. Among them encapsulation technology allows the incorporation of the active substances inside nanoparticles (NPs) to i) protect the drug, ii) effectively deliver it through the skin iii) control the release over time.In the present work, drug-loaded NPs were produced by employing polycaprolactone (PCL) as shell material. The produced nanoparticles were then used to finish cotton fabrics producing biofunctional textiles to be employed as wearable drug delivery devices. The flash nanoprecipitation technique (FNP) was exploited for the nanocarrier production being identified as a simple, sustainable and efficient production process. The suitability of the FNP process to produce NPs to be used in the preparation of biofunctional textiles was investigated. The PCL nanoparticles were produced by loading three different drugs in the system i.e. caffeine, melatonin, and curcumin. Such drugs are indeed considered model drugs in terms of hydrophilicity level. The latter is a key property in determining the outcome of the encapsulation process and the dermal permeation.The FNP process was run by dissolving the polymer in an organic solvent and making the solution stream collide against an antisolvent stream in a micromixer, resulting in the polymer precipitation in the form of nanoparticles. The drugs were precipitated together with the polymer upon being added either to the solvent or the antisolvent stream. For each active substance, the experimental protocols and analytical methods were adjusted to better investigated the drug-loaded NPs system. The effect of the formulation as well as the process parameters on the properties of the nanoparticles was investigated. The process was optimized to produce particles with a diameter lower than the one of skin pores. The amount of drug loaded in particles was investigated by loading capacity (LC) and encapsulation efficiency (EE). Furtherly, the NP formulations were characterized to obtain insights on their physical, chemical, and morphological properties by various analytical techniques.The particles were applied to the cotton fabric either by imbibition or impregnation methods. The effectiveness of the functionalization treatment was evaluated combining different analyses. The biofunctional properties were studied in terms of antioxidant activity, UV protection factors, and drug release. For the latter test, the Franz cell method was employed using either artificial and excised porcine skin membranes.The study showed that the FNP allows producing drug loaded PCL NPs for all the three investigated substances. The proposed finishing treatment allowed to effectively functionalize the fabric surface. The treated textiles allowed to effectively deliver the active principles to the skin with permeation profiles dependent on the drug properties. The nanoparticle finishing also imparted cotton antioxidant and UV protection properties
Rault, François. "Mise en oeuvre et propriétés mécaniques, thermiques et de tenue au feu de filaments à base de polypropylène chargé en nanoparticules." Valenciennes, 2008. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/fdf2aa0d-1453-4fee-8b94-d1e493d57372.
Повний текст джерелаThe french textile industry meets stiff competition. The firms try to differentiate themselves by improving or adding new properties to their products. The cost remaining a major concern, PP, polymer with an interesting compromise cost / ownership, is therefore widely used. Different ways exist to functionalize this polymer. One of them is to add fillers. However, the size and rate of particles commonly added to achieve satisfactory properties cause difficulties during the melt spinning process. Due to their characteristics (size and filler rate), nanoparticles offer an interesting alternative to explore. Blends PP / Clay were prepared with a twin-screw extruder before being spun. A strong decrease in the elongation properties of filaments in the presence of clay, probably due to its low exfoliation, brings us to consider the preparation of ternary blends (PP / PA-6 / Clay). However, it was not possible to spin these blends for a filler rate higher than 1 wt% due to their specific morphologies. Filaments of PP filled with clay and graphite and filaments of PP filled with based manganese nanoparticles have also been produced to assess their mechanical and thermal properties. Under air, thermal stability of PP has been improved with all tested fillers. And finally, the filaments made were used to produce knitted fabrics, whose fire properties have been studied with a cone calorimeter
Mendoza, Luz Esmeralda Roman. "Funcionalização de tecidos têxteis com nanopartículas para proteção UV." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/100/100133/tde-14062018-161627/.
Повний текст джерелаIn Brazil, institutions such as the José Alencar Gomes da Silva National Cancer Institute (INCA) and the Brazilian Ministry of Health reported increase and appearance of new types of cancer in recent years. Skin cancer is the most common type of disease worldwide and generally might be related to the exposure of the skin to ultraviolet (UV) radiation generated by the sun. The objective of this work was to perform the functionalization of 100% cotton woven fabrics with zinc oxide (ZnO) nanoparticles (NPs), which has interesting properties for applications as solar protector, thus improving the protection characteristics of cotton against UV radiation. ZnO NPs were synthesized by the precipitation process using zinc nitrate hexahydrate (Zn(NO3)2.6H2O) and sodium hydroxide (NaOH). In situ synthesis of ZnO NPs onto the fabric was carried out via exhaust dyeing method, using the textile High Temperature (HT) dyeing machine. For this process, different concentrations of Zn(NO3)2.6H2O (2, 5, 8 and 10% on the weight of fabric) and NaOH (0.7, 1.6, 2.5 and 3.0 g/L) were used. The evaluation of UV protection factor (UPF) and wash durability tests were performed according to AATCC 183:2004 and AATCC 61:1996 standards, respectively. Commercial textile resins applications onto functionalized fabrics and determination of physical properties were also performed. In addition, molecular, structural and morphological characterizations of ZnO NPs were carried out and structural, morphological and thermal analyzes were performed for functionalized fabric. The results showed that both ZnO NPs and those in situ synthesized onto the fabric, exhibited wurtzite hexagonal crystalline structure. The ZnO NPs displayed a star-like morphology with very pronounce tips, while the NPs onto the fabric had a similar morphology but with small tips. For all concentrations of zinc nitrate studied, before and after 20 cycles washing, the UPF of cotton fabrics functionalized with ZnO NPs had an UV-protection category between good to excellent
Guillot, Murielle. "Elaboration et caractérisations de matériaux lamellaires hybrides inorganiques-organiques dérivés des Phyllosilicates : Précurseurs de nanoparticules de nickel métallique." Université Louis Pasteur (Strasbourg) (1971-2008), 2002. http://www.theses.fr/2002STR13053.
Повний текст джерелаYan, Xiang. "Design of biphasic polymeric fiber from melt-spinning charged with nanoparticles : effects of the formulation and the fillers localization, to obtain a functionalized fiber at surface level." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I084.
Повний текст джерелаThe work aims to make the functional porous polypropylene (PP) fibers as well as PP microfibers, by the melt spinning of PP-poly(vinyl alcohol) (PVA) blends followed with the selective phase extraction of PVA. The objective is to first find out the optimal ratio of PP and PVA for fabrication of multifilament yarns by melt spinning, and to localize the filler at the biphasic interface. The fillers include not only the homogenously modified silica nanoparticles, but also the kaolinite Janus particles. The concomitant morphology evolution of the extrudates and fibers were observed. The work mainly discusses about the fabrication of porous fibers, but also makes an exploratory experiment to reverse the ratio to fabricate the microfibers. It was found that the ratio of two polymers as 70 wt.%/30 wt.% is an ideal formula for fabricating the porous fibers. Both of the two fillers are successfully tailored at the biphasic interface. The localization of silica nanoparticles within the biphasic can be fixed by the thermodynamic control, and one of the sorts has been dominantly localized at the biphasic interface. In addition, the Janus particles provide an alternative way to have the interface localization, which even helps the mechanical enhancement. The feasibility of microfiber production with the embedment of the fillers was also demonstrated
Benoit, Virginie. "Relation entre structure et texture de matériaux poreux et l'évaluation de leurs propriétés de piégeage du CO2." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0635/document.
Повний текст джерелаMixte Matrix Membranes (MMM’s) are promising materials for CO2 capture compared to current technologies as absorption using amines solvents (monoéthanolamine). Metal-Organic Frameworks (MOFs) are crystalline porous materials which can be integrate under nanoparticles shape to polymer phase of MMM’s. They are built from metal nods and organic ligand to yield well-defined tridimensional structure (3D). They possess various advantages: high specific surface area and pore volume, tunable pore size and some of them are stable in presence of water. MOFs have a sustainable chemistry to targeted applications unlike traditional adsorbents as activated carbons, zeolites.On the one hand, this work aimed the assessment of CO2 separation performances of microporous MOFs for CO2/N2 and CO2/CH4 gas separations. The ‘gas-adsorbent’ interactions are favored in MOFs by: (1) a decrease of pore size, pore volume which can involve confinement effects, molecular sieve effects or (2) the presence of surface groups. Therefore, these factors can contribute to the CO2 selectivity improvement and have been studied for various microporous MOFs. On the other hand, textural (specific surface area, pore volume) and thermodynamic (adsorption enthalpy) parameters have been correlated to CO2 maximum excess uptakes through a quantitative structure-property approach to establish some linear trends
Νοχός, Αργύριος. "Διερεύνηση της μετανάστευσης και της αποδέσμευσης αντιμικροβιακών ουσιών από πολυμερικές ίνες πολυλειτουργικών υφασμάτων". Thesis, 2008. http://nemertes.lis.upatras.gr/jspui/handle/10889/1342.
Повний текст джерелаThe present thesis studies the development of a versatile system of antimicrobial protection for use in clothing and household products. In particular Triclosan incorporated crosslinked polystyrenedinylbenzene nanobeads were developed; triclosan is a widely used antimicrobial agent. It is noted that the health hazards arising during nosocomial treatment due to infections caused by microbial pathogens and the means to protect oneself against such threats have become the subject of many research activities during the last few decades. The size of the nanoparticles after examination with scanning electron microcopy (SEM) and dynamic light scattering (DLS) was found to vary between 35-350 nm depending on the system formulation. Their thermal behavior was studied with differential scanning calorimetry (DSC) and their melting point was measured at ~425 oC. Using UV-Vis spectroscopy the real encapsulation efficiency of the antimicrobial in the system was determined at ~72% and its release kinetics were studied in a water-ethanol solution. The nanobeads possess controlled release properties; they were furthermore incorporated into polypropylene matrixes which were uniaxially drawn in film form. Finally utilizing polarized Raman spectra, the draw induced molecular orientation of the films was correlated to the relevant variation of the related antimicrobial release kinetics. The first chapter of the present thesis reviews the textile microbial infections and the various solutions that have been proposed showing up the specific research goal targeted. In the second chapter the meaning of controlled release is explained and the basic system categories involved are presented along with characteristic examples. The nanoparticles, their composition, special attributes, applications, synthesis and characterization techniques are the subject of the third chapter. The fourth chapter reports information about the materials and the methods used in the synthesis, postprocessing and characterization of the nanoparticles and their blends. Finally the last chapter presents the experimental results and relevant comments.
Tseng, Yung-Yuan, and 曾泳源. "Warm-Keeping Effect of Textile Knitted by Nanoparticle-Contained Fabric." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/56597127834568178612.
Повний текст джерела國立雲林科技大學
機械工程系碩士班
94
In recent years ,there are various applications of nanotechnology to improve textile warm-keeping ability, but the theory has not been studied completely yet. This study aims at the bio-ceramics fabric warm-keeping principle and explains this phenomenon by the energy exchange in the micro-scale to set up a model can extend its application.
Mishra, Anu. "Studies on multi-functional properties of doped TiO2 nanoparticle coated cotton fabric." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/8015.
Повний текст джерелаPaul, Sangita. "Silver nanoparticle dispersions for antimicrobial finishing of textiles." Thesis, 2013. http://localhost:8080/xmlui/handle/12345678/6766.
Повний текст джерелаLe, Hoai Nga. "A concept for nanoparticle-based photocatalytic treatment of wastewater from textile industry." Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A30121.
Повний текст джерелаBarbosa, Tiago Manuel Martinho. "Photocatalytic and self-cleaning functionalized textiles with TiO2 nanoparticles and thin films." Master's thesis, 2014. http://hdl.handle.net/1822/50024.
Повний текст джерелаNanocoatings applied in textile finishing are a very attractive way to add value to dayto- day products offering an interesting set of important and differentiated properties. The photocatalytic activity of titanium dioxide (TiO2) based nanomaterials for textile applications has been identified as a strategic vector with great industrial impact. The development of self-cleaning and antimicrobial surface finishes in common textiles has the potential to be used as a prophylactic measure to reduce the infection rates in hospitals as well as reduce the environmental impact of washing processes. In this research work Pulsed DC Magnetron Sputtering technique was used to deposit TiO2 thin films onto glass and Poly(lactic acid) (PLA) and cotton based substrates. On the other hand, TiO2 nanoparticles were also deposited on the textile surfaces by means of a dip-coating process. The main goal of the research work was the production of TiO2 - based functionalized textile substrates without changing its surface characteristics such as aesthetic and sensorial (e.g. touch feeling) properties. The applied textile finishing techniques in this research work need less to none of the solvents or surfactants commonly used in the industry leading to a cleaner production process reducing significantly the environment pollution. The samples were characterized by using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Atomic Force Microscopy (AFM), Contact Angle measurements and UV – visible Spectroscopy techniques. The photocatalytic activity of the samples was studied by measuring the Methylene Blue (MB) degradation over time as a result of the catalyst exposure to ultraviolet (UV) radiation and its correlation with the initial concentration. This effect is directly correlated to the photocatalytic efficiency and rate of the samples. The self-cleaning activity was also evaluated by a wine stain removal test under UV light exposure.
Nanorevestimentos aplicados no processo de acabamento de materiais têxtil são uma forma muito atrativa para adicionar valor a produtos do quotidiano conferindo-lhes um conjunto de propriedades importantes e inovadoras. A atividade fotocatalítica dos nanomateriais à base de dióxido de titânio (TiO2) em aplicações têxteis tem sido identificado como um vetor estratégico com um elevado impacto industrial. O desenvolvimento de superfícies com acabamentos autolimpantes e antimicrobianos em têxteis comuns tem o potencial de ser utilizado como medida profilática na redução de taxas de infeção em ambientes hospitalares e reduzir o impacto ambiental relacionado com os processos de lavagem. Neste trabalho de investigação foi utilizada a técnica de pulverização catódica em magnetrão utilizando fonte DC pulsada para depositar filmes finos de TiO2 em substratos de vidro e de materiais têxteis baseados em ácido poliláctico (PLA) e algodão. Por outro lado, depositaram-se nanopartículas de TiO2 em substratos têxteis pela utilização de um processo de imersão. O principal objectivo do trabalho de investigação foi a produção de materiais têxteis com acabamentos de TiO2 sem que ocorresse a alteração das características superficiais tais como propriedades estéticas e sensoriais (e.g. sensação ao toque). As técnicas de acabamento superficial nos materiais têxteis utilizados neste trabalho de investigação utilizam uma quantidade inferior de solventes e tensioativos comparativamente com as normalmente utilizadas na indústria reduzindo, significativamente, a poluição ambiental. As amostras foram caracterizadas pela utilização das técnicas de Microscopia Electrónica de Varrimento (MEV), Microscopia de Força Atómica (MFA), medição do ângulo de contacto e Espectroscopia UV-Visível. A atividade fotocatalítica das amostras foi estudada inicialmente pela medição da degradação do Azul-de-metileno ao longo do tempo em resultado da exposição do catalisador à radiação ultravioleta (UV) e a sua correlação com a concentração inicial. Este efeito é diretamente correlacionado com a eficiência e velocidade fotocatalítica das amostras. A actividade autolimpante foi testada através de um teste de remoção de uma nódoa de vinho de um substrato têxtil funcionalizado com TiO2 exposto à luz UV sendo medido o valor de K/S correspondente ao longo do tempo de exposição.
Pinto, Tânia Vanessa Oliveira. "Photoswitchable silica nanoparticles for the production of light responsive smart textiles: from fabrication to coating technology." Doctoral thesis, 2017. https://repositorio-aberto.up.pt/handle/10216/105967.
Повний текст джерелаPinto, Tânia Vanessa Oliveira. "Photoswitchable silica nanoparticles for the production of light responsive smart textiles: from fabrication to coating technology." Tese, 2017. https://repositorio-aberto.up.pt/handle/10216/105967.
Повний текст джерелаYang, Yu-Wei, and 楊育瑋. "Preparation of Conductive Textiles Containing Polypyrrole and Metal Nanoparticles by Diffusion-Oxidation Method and Property Characterization." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/d4pus7.
Повний текст джерела國立臺北科技大學
有機高分子研究所
96
Fabrics including cotton, nylon 6 and poly(ethylene terephthalate) were pre-adsorbed metal nanoparticles(Au、Ag and Cu) and diffused with pyrrole. These fabrics were chemically oxidized by FeCl3 in water. Polypyrrole has been found incorporating into interior of fibers and spacing between fibers. The resistivities of polypyrrole and nanoparticles contained fabrics were lower than those of fabrics containing polypyrrole(30 to 100 Ω/square). The existence of metal nanoparticles in fabric was identified by atomic absorption spectroscopy and electron dispersive spectroscopy. Gold loading of the conductive fabric was high comparing to two other metals. Dispersion of preadsorbed metal nanoparticles on the surface of fibers of pristine fabric was good according to images taken from electron scanning microscope. Electromagnetic shielding of the conductive fabrics were significant 8-26dB(nylon 6)、7-15dB(PET) and 5-9dB(cotton),although resistance of polypyrrole lose during laundry was fair for above textiles.
Chiou, Ya-Huei, and 邱雅惠. "Preparation of Conductive Textiles Containing Polypyrrole and Metal Nanoparticles by Chemical Oxidation Method and Property Characterization." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/2s3926.
Повний текст джерела國立臺北科技大學
有機高分子研究所
96
Pyrrole with various amount of metal nanoparticles including Au、Ag and Cu was chemically oxidized by iron(III) chloride hexahydrate in water and deposited as a polymer film on the surface of fabrics(cotton and nylon 6 and PET).The surface resistivities of above conductive textiles were measured by four-point probe method. The existence of metal on the fabric was identified using atomic absorption spectroscopy and energy dispersive spectrometry. It indicated that the surface resistivities of metal nanoparticles and polypyrrole coated cotton fabric was lower than that of polypyrrole cotton fabric. The same kind of trend was found for metal nanoparticles and polypyrrole coated nylon 6 or PET fabric. The surface of polypyrrole-coated fibers of metal-containing fabric was smooth according to scanning electron microscopic images. Electromagnetic shielding and resistance of polypyrrole loss for laundry were fair for the conductive fabrics prepared by above method.
Ali, Md S. Wazed. "Synthesis and characterization of chitosan nanoparticle and its application on textiles using layer-by-layer self- assembly approach for antimicrobial activity." Thesis, 2011. http://localhost:8080/xmlui/handle/12345678/3920.
Повний текст джерелаRodrigues, Joana Mendes. "Desenvolvimento de metodologias para avaliação de nanomateriais incorporados em diferentes substratos têxteis." Master's thesis, 2017. http://hdl.handle.net/1822/54863.
Повний текст джерелаNos últimos anos, tem-se observado um crescente interesse em têxteis funcionais, o que tem levado a indústria têxtil a apostar em novos materiais e processos baseados na nanotecnologia. No entanto, a incorporação de nanomateriais para conferir funcionalidades ao têxtil, pode estar também associada ao aparecimento de efeitos adversos quando em contacto com o ser humano e ainda do ponto de vista ambiental. Uma das maiores preocupações no caso dos têxteis é a possível libertação dos nanomateriais, a qual depende muito da estabilidade dos mesmos após a sua incorporação num substrato têxtil. Desta forma, é importante identificar e quantificar estes nanomateriais ligados covalentemente ao substrato, para avaliar a sua estabilidade e possível libertação. Assim, este projeto teve como principal objetivo o desenvolvimento de metodologias expeditas para quantificar nanomateriais incorporados em substratos têxteis e consequentemente, avaliar a sua estabilidade e resistência a processos de lavagem. Para a concretização dos objetivos propostos, numa primeira fase, funcionalizou-se um substrato têxtil 100% algodão com duas formulações de nanopartículas de naturezas distintas, designadamente nanopartículas de base proteica (NPs PA) e nanopartículas de um polímero sintético (NPs PB). Após a funcionalização, quantificaram-se as nanopartículas incorporadas no têxtil através de métodos de espetrofotometria de absorção para as NPs PA, incluindo o método de Bradford e o método de Acid Orange, e recorreu-se ao método da titulação ácido-base para quantificação das NPs PB. Para estudar a resistência da funcionalidade do têxtil às lavagens, procedeu-se à funcionalização de provetes têxteis com as nanopartículas e diferentes agentes de ligação, sendo estes posteriormente submetidos a diferentes condições de lavagem. Os resultados mostraram que o método da titulação é viável para a quantificação das NPs PB incorporadas no têxtil. Quanto à quantificação de NPs PA incorporadas no têxtil apenas o método de Acid Orange apresentou resultados viáveis. Contudo, verificou-se ao longo do desenvolvimento do projeto que estes métodos podem ser influenciados por diversos fatores, os quais terão de ser tidos em conta aquando a quantificação das nanopartículas. Através das técnicas de caracterização de Espetroscopia de Infravermelho com Transformadas de Fourier com Refletância Total Atenuada (FTIRATR) e de microscopia eletrónica de varrimento (SEM) foi possível detetar a presença de ambas NPs poliméricas nos têxteis funcionalizados. Nos ensaios da durabilidade às lavagens os resultados obtidos pelos métodos acima referidos indicaram que nenhum dos agentes de ligação testados aumentava a resistência das nanopartículas às lavagens, verificando-se que estas se libertavam do têxtil logo após a lavagem de processo, no qual apenas se utiliza água e temperatura.
Over the last years, there has been a growing interest in functional textiles, which has led the textile industry to invest in new materials and processes based on nanotechnology. However, the incorporation of nanomaterials to promote textile functionalities may also be associated with adverse effects when in contact with human skin, well as from an environmental point of view. One of the major concerns in the case of textiles is the possible release of nanomaterials, which highly depends on the stability after their incorporation into a textile substrate. Therefore, it is important to identify and quantify the nanomaterials covalently bounded to the substrate in order to evaluate their stability and possible release. Thus, the main purpose of this project was to develop prompt methodologies to quantify nanomaterials incorporated in textile substrates and consequently, to evaluate their stability and washing resistance. In order to accomplish the proposed objectives, at a first stage, a 100% cotton textile substrate was functionalized with two formulations of nanoparticles of different natures, namely protein-based nanoparticles (NPs PA) and nanoparticles of a synthetic polymer (NPs PB). Afterwards, the textiles functionalized with NPs PA were quantified by absorption spectrophotometry methods, including the Bradford and the Acid Orange methods, whereas the acid-base titration method was used for quantification of the samples functionalized with NPs PB. In order to study the washing resistance of the textiles after functionalization, some textile samples were functionalized with nanoparticles and different crosslinking agents, being afterwards subjected to different washing conditions. The results showed that the titration method is suitable for the quantification of NPs PB incorporated in the textile. As for the quantification of NPs PA incorporated in the textile only the Acid Orange method presented viable results. Nevertheless, throughout the project development, it was verified that these methods can be influenced by several factors, which will need to be considered when quantifying the nanoparticles. The characterization techniques of Infrared Spectroscopy with Fourier Transform with Attenuated Total Reflectance (FTIR-ATR) and Scanning electron microscope (SEM) allowed the detection of the presence of both polymer nanoparticles in the functionalised textiles. Regarding the washing tests, the results achieved by the abovementioned methods indicated that none of the crosslinking agents tested increased the nanoparticles’ resistance to the washing process. Indeed, it was found that they were released from the textile immediately after the washing process, using only water and temperature.