Дисертації з теми "Potential of nano and micro particles"
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Meehan, Timothy D. Superfine Richard. "Quantitative magnetophoresis of micro and nano particles." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,2272.
Повний текст джерелаTitle from electronic title page (viewed Jun. 26, 2009). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.
Li, Xue. ""Cage" Nano and Micro-particles for Biomedical Applications." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS316/document.
Повний текст джерелаDrug delivery systems are engineered technologies to administer pharmaceutical ingredients to improve their therapeutic effects, aiming at minimizing their side effects by means of targeted delivery and/or controlled release. “Cage” particles recently drew special attention since they could act as “drug containers” which potentially load large amount of drugs, improve their stability and offer the possibilities to co-encapsulate synergetic drugs. Cyclodextrins (CDs) are typical “cage” molecules with a hydrophobic cavity and a hydrophilic outer surface. Taking advantage of the host-guest interactions between β-CD and benzophenone (Bz), CD based nanoparticles (CD-NPs) were the first formulation investigated. CD-NPs of around 100 nm were instantaneously produced by mixing two aqueous solutions of neutral polymers: 1) poly-CD containing β-CDs, and 2) Bz grafted Dex (Dex-Bz). The “green” and facile preparation procedure makes it attractive formulation, whereas its limitation lies on the low drug payloads (~ 5 wt%). In order to improve the drug loading capacity of CDs, porous CD based metal organic frameworks (CD-MOFs) were synthesized, which contain not only CD cavities, but also large pores built up by CDs self-assembly. Lansoprazole (LPZ) was incorporated in CD-MOF microcrystals (~ 6 µm) reaching payloads as high as 23.2 ± 2.1% (wt). Remarkably, each CD cavity was able to host a drug molecule, offering new opportunities for the use of CD-MOFs for drug delivery purposes. However, these particles disassembled in aqueous media, which limits their application for oral and intravenous administration. Surface modification is therefore necessary to improve their stability in water. The drug loaded CD-MOF nanocrystals (~ 650 nm) were successfully embedded in polyacrylic acid (PAA) polymer matrices. The composite microspheres exhibited spherical shapes and sustained drug release over a prolonged period of time (over 48 h). Drug loaded MOF/PAA composite microspheres were not toxic in vitro (cell viability ~ 90%) even at very high concentrations up to 17.5 mg/mL. MOF/PAA composite microspheres constitute an efficient and pharmaceutically acceptable MOF-based carrier for sustained drug release. However, the process of surface modification was complicated and lead to larger particles and reduced drug payloads. Water-stable MOFs are a novel type of hybrid particles, showing a high potential as drug carriers. Iron trimesate MOFs, namely, MIL-100 (Fe) (MIL stands for Material of Institute Lavoisier) was among the first nano-scaled MOFs used for drug delivery. These particles were stable in water but degraded in phosphate buffer saline (PBS) losing their crystallinity and constitutive trimesate linkers. However, it was discovered that they kept their morphology intact. A thorough analysis based on Raman microscopy was carried on to gain insights on both the morphology and chemical composition of individual particles. It was evidenced the formation of a sharp erosion front during particle degradation. Noteworthy, the MOFs did not degrade during drug loading nor surface modification. Co-encapsulation of two synergic antibiotics (amoxicillin and potassium clavulanate) in MIL-100 (Fe) nanoMOFs was achieved following a “green” procedure by soaking nanoMOFs in aqueous solutions of both drugs. Molecular modelling showed that each drug preferentially located in a separate nanoMOF compartment. Surprisingly, nanoMOFs were prone to co-localize with bacteria once internalized in infected macrophages. NanoMOFs acted synergistically with the entrapped drugs to kill intracellular S. aureus, in vitro. These results pave the way towards the design of engineered nanocarriers in which each component synergistically plays a role in fighting the disease. These studies unravel the potential of “cage” particles for efficient drug entrapment and controlled release and open numerous possibilities for applications
Sergides, M. "Optical manipulation of micro- and nano-particles using evanescent fields." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1410938/.
Повний текст джерелаCockcroft, Stephanie. "VUV 157nm F₂ laser irradiation of micro- and nano-scale particles." Thesis, University of Hull, 2012. http://hydra.hull.ac.uk/resources/hull:7106.
Повний текст джерелаSpinella-Mamo, Vincent Paul. "Control of micro- and nano- particles with electric and magnetic fields." Connect to Electronic Thesis (CONTENTdm), 2008. http://worldcat.org/oclc/458547540/viewonline.
Повний текст джерелаMarcetich, Adam Michael. "Ultrasound spectral parameters of micro- and nano- particles: measurement software and modeling." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1413384380.
Повний текст джерелаOthman, Rahimah. "Production of functional pharmaceutical nano/micro-particles by solvent displacement method using advanced micro-engineered dispersion devices." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/22905.
Повний текст джерелаSimpson, Brian Keith Jr. "Strain engineering as a method for manufacturing micro- and; nano- scale responsive particles." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34728.
Повний текст джерелаGun, S. "Electrohydrodynamic atomization forming of micro and nano-scale magnetic particles for biomedical applications." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1468713/.
Повний текст джерелаQin, Zhenpeng. "Modeling of Ion Transport for Micro/Nano Size Particles in Coulter Counter Application." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1240858653.
Повний текст джерелаGrant, Neil Cameron. "Emulsion templating as a route to the release of organic micro- and nano- particles." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569572.
Повний текст джерелаEnayati, M. "Electric jet assisted production of micro and nano-scale particles as drug delivery carriers." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1334119/.
Повний текст джерелаHorie, Rie. "Treatment of inner ear disorders using nano/micro particles based on drug delivery system." Kyoto University, 2011. http://hdl.handle.net/2433/142087.
Повний текст джерелаPenon, Esteva Oriol. "Synthesis and functionalization of nano- and micro-particles for sensing and therapy in living cells." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/132676.
Повний текст джерелаEl diseño y la preparación, mediante la utilización de procesos de biofuncionalización de micro / nanosistemas que puedan tener aplicación en células vivas es un tema de actualidad en campos como la Nanobiotecnología y la Nanomedicina. De este modo, en la presente tesis se ha estudiado el proceso de biofuncionalización de micropartículas de polisilicio, para actuar como etiquetas celulares, debido al interés que genera la posibilidad de poder etiquetar células vivas y así conocer el comportamiento de las células de manera individual. Sucesivamente, también se ha estudiado la preparación de quimiosensores de dos parámetros intracelulares (pH y calcio) basados en compuestos con capacidad de variar la intensidad de su fluorescencia, según cambios del medio. Concretamente, se ha trabajado en la síntesis e inmovilización de derivados del aminoantraceno en micropartículas de silicio como posibles candidatos para obtener microherramientas capaces de detectar cambios en el pH o en la concentración de calcio intracelulares. Por otro lado, la tesis también describe la preparación de nanosistemas para su aplicación en terapia fotodinámica. La terapia fotodinámica (PDT) se basa en el uso de moléculas específicas (fotosensibilizadores), que en presencia de luz (generalmente un láser), activan el proceso de la muerte celular debido a la formación de radicales libres de oxígeno. La combinación de la utilización de nanopartículas modificadas con un fotosensibilizador resulta un reto interesante que podría mejorar la terapia antitumoral, disminuyendo sus efectos secundarios. Concretamente, en la tesis se describe la preparación de nuevos fotosensibilizadores derivados de porfirinas, con el fin ser incorporados a nanopartículas de óxido de hierro y de oro. También se detalla el estudio de la capacidad de los nuevos nanosistemas obtenidos de producir oxígeno singlete como elemento inductor de la apoptosis celular, y resultados preliminares in vivo indican su potencial aplicación en PDT. Estos estudios, demuestran la posibilidad de dichos nanosistemas para ser usados en terapia fotodinámica. Por último, también se han sintetizado derivados de metalo-porfirinas como componentes de rotores moleculares.
Bodnár, Eszter. "Electrospraying of polymer solutions for the generation of micro-particles, nano-structures, and granular films." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/379820.
Повний текст джерелаSe ha realizado un estudio sobre los mecanismos de formación de micropartículas poliméricas y sus películas granulares, a partir del secado de microgotas de electropras. El estudio se centra en diferentes soluciones de tres polímeros insolubles en agua: polimetil(metacrilato), poliestireno, y etil celulosa. El secado de estos electrosprays da lugar a diversas morfologías de partícula, que han sido determinadas mediante microscopía de barrido electrónico, y han sido caracterizadas en función del solvente, concentración del polímero, su peso molecular, y la humedad relativa ambiente. Las morfologías obtenidas incluyen una variedad de estructuras de partícula globulares y filamentosas, que, a humedad relativa elevada, pueden desarrollar porosidad. Estas características morfológicas han sido explicadas mediante modelos cualitativos que involucran fenómenos fluido dinámicos y sobre separación de fases, presentes en sistemas relacionados con los estudiados. Uno de los fenómenos fluido dinámicos involucrados clave son las inestabilidades coulómbicas de gotas eléctricamente cargadas. Además, la interacción de no solvente del agua en la precipitación del polímero puede dar lugar a texturas porosas sobre la superficie de las partículas. Los diferentes tipos de texturas han sido explicadas en referencia a los fenómenos de breath figure formation (BFF), y a inversión de fases inducida por vapor (vapor induced phase separation, o VIPS). También hemos estudiado el crecimiento de las películas granulares formadas a partir de las partículas poliméricas. Demostramos que la carga eléctrica transportada por las partículas hacia la película influye fuertemente en la dinámica de crecimiento de ésta. Un mejor conocimiento de los mecanismos estudiados en esta tesis debería permitir diseñar nuevos procesos de manufactura de partículas y recubrimientos basados en electrospray.
A study has been made of the mechanisms underlying the formation of polymeric microparticles and of their granular films, by drying of electrospray microdroplets. The study is focused on different solutions of three water-insoluble polymers: polymethyl(methacrylate), polystyrene, and ethyl cellulose. The drying of such electrosprays result in diverse particle morphologies, which have been determined by scanning electron microscopy, and have been characterized as a function of the solvent, polymer concentration, polymer molecular weight, and ambient relative humidity. The morphologies obtained include a variety of globular and filamented particle structures, which, at elevated relative humidity, can develop porosity. These morphological features have been explained using qualitative models involving fluid dynamic and phase separation phenomena which are known to occur in closely related systems. One of the key fluid dynamic phenomena involved is the coulombic instability of electrically charged droplets. In addition, the non-solvent interaction of water on the precipitation of the polymer can lead to porous textures on the particles surfaces. The different kinds of textures have been explained by reference to breath-figure formation (BFF) and vapor induced phase separation (VIPS) phenomena. We have also studied the growth of the granular films of such polymer particles. We show that the electrical charge transported by the particles to the film have a strong influence on the film growth dynamics. The better understanding of the mechanisms studied in this thesis, should help design new manufacturing processes of particles and coatings based on electrospray.
Garrido, Pacheco Mariano. "Electromagnetic processing of molten light alloys reinforced by micro/nanoparticles." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI010/document.
Повний текст джерелаImprovement in mechanical properties of pure metals and alloys can be achieved by the introduction of ceramic particles appropriately dispersed within the material. These particles can act as nucleation sites enhancing the reduction of the crystallite (grain) size. The dispersion of these nucleant materials presents challenges due to their tendency to sediment and to agglomerate. Particles of nanometric size can also produce the improvement of mechanical properties by several reinforcement mechanisms such as Orowan or grain boundary strengthening. The use of electromagnetic stirring can provide a method to disperse particles and produce changes in the microstructure of the material. The induced stirring can increase the number of nucleation points available during solidification breaking the arms of the new formed dendrites at the solidification front. The temperature field in the molten material can be also homogenized by the action of the electromagnetic stirring. The small temperature gradient produced in the liquid metal can promote the growing of equiaxed dendrites. In this study a Bridgman type furnace has been used to produce materials containing grain refiners and reinforcement particles. The furnace has been equipped with a Bitter coil electromagnet capable to produce a travelling magnetic field (TMF). The electromagnetic stirring provides an induced flow which is used to disperse the particles and produced measurable changes in the microstructure of the materials studied. The experiments carried out were supported with numerical simulations performed by University of Greenwich and Simap laboratory. Experiments performed dispersing SiC microparticles into pure magnesium matrix showed that particle concentration patterns in the material are strongly governed by the vertical orientation of the magnetic field applied (upwards vs downwards). The observed patterns of dispersion obtained from the experiments presented a good agreement with the patterns predicted by the numerical simulation. The effects of the electromagnetic stirring in the grain refining of pure aluminium showed positive results whereas the alloys subjected to stirring presented grain growth. The TMF was used to disperse particles of micrometric and nanometric size. The dispersion of microparticles in magnesium and aluminium alloys did not produce improvements in either grain refinement or mechanical properties. However, the experiments performed dispersing nanoparticles in magnesium alloy showed the improvement of creep resistance
Mukundan, Mallika. "Phase control in the synthesis of yttrium oxide nano and micro-particles by flame spray pyrolysis." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1568.
Повний текст джерелаRivero-Huguet, Mario. "Mobilization and detoxification of soils, contaminated with carcinogenic oxyanions using micro-and nano- sized metallic particles." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66943.
Повний текст джерелаLe lavage de sols est un processus de traitement qui a été employé intensivement pour l'extraction des produits toxiques, néanmoins le processus ne détoxique pas les polluants mobilisés. Les procédés plus communs de désintoxication incluent les réactions rédox qui sont négociées par les métaux nullivalents (MNVs). La réduction de Cr(VI) au Cr(III) est souhaitable, car la dernière espèce est moins toxique pour la plupart des êtres vivants, et a également une basse mobilité et disponibilité biologique. Les objectifs principaux de ce projet ont inclus le développement d'une méthode efficace pour l'extraction et la détoxication des anions inorganiques toxiques utilisant MNVs dès sols contaminés.Une série de micro-MNVs (Al, Cu, Fe, Mg, Ni, Si, et Zn); de combinaison métalliques (Pd/Fe, Ag/Fe, Cu/Fe, Zn/Fe, Co/Fe, Mg/Fe, Ni/Fe, Al/Fe, Si/Fe, Pd/Cu, Pd/Zn, Pd/Cu/Fe, Pd/Zn/Fe, et Zn/Cu/Fe); de nano-particules (NPs) de Cu et Fe ; ainsi que des NPs bimétalliques (Pd/Fe, Cu/Fe et Pd/Cu) ont été évalués sur la réactivité vers la réduction de Cr(VI) dans une préparation d'agent tensioactif (Tween® 20) sous différentes conditions de réaction. Aux pHs près de la neutralité, on a observé une inactivation rapide de la surface pour presque tous les métaux examinés tandis que la réduction totale de Cr(VI) a été réalisée au pH acide seulement en employant le Cu, le Fe, le magnésium, ou le Zn. Au regard à la réactivité du fer nullivalente, les préparations bimétalliques testées (Pd/Fe > Pd/Zn> Ag/Fe > Ni/Fe> Zn/Fe > Pd/Cu > Cu/Fe) ont sensiblement augmentés la constante de vélocité de pseudo-première taux. La préparation métallique Zn/Cu/Fe, représente un mélange métallique rentable fournissant des paramètres cinétiques comparables ou améliorés par comparaison aux mélanges bimétalliques plus chers qui possèdent du palladium. Les résultats suggèrent, que la cémentation
D'Amen, Eros <1985>. "Synthesis and Characterization of Functional Inorganic Nano-Micro Particles and their Role in Innovative Practical Applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7622/1/TESI_Eros_DAmen.pdf.
Повний текст джерелаIn questa tesi sono riportate sintesi e caratterizzazione di nano-micro particelle di materiale cristallino inorganico, e quattro loro applicazioni. Le particelle inorganiche sono state preparate seguendo due criteri principali: i) le proprietà chimico-fisiche delle particelle devono essere ottimizzate in funzione dell’applicazione; ii) sintesi e applicazione devono essere basate su procedure semplici, con basso impatto ambientale ed economicamente sostenibili. In particolare, nano particelle di Titanio biossido sono state sintetizzate tramite reazione di idrolisi di Titanio(IV) isopropossido in una soluzione di acqua a alcol isopropilico. L’alcol isopropilico presente nella miscela di solventi agisce da agente cappante stabilizzando le nanoparticelle in formazione e dimostra un ruolo nella stabilità della sospensione. Il Titanio biossido prodotto ha rivelato buone proprietà foto catalitiche senza bisogno di ulteriori trattamenti termici. Il Titanio biossido foto attivo è stato applicato con buoni risultati nell’abbattimento di NOx dalle emissioni di uno stabilimento e come strato autopulente su dei pannelli fotovoltaici. Sono state sintetizzate nano e micro particelle di calcio fosfati cristallini, nello specifico Idrossiapatite, Brushite, Monetite and β-Tricalcio fosfato Mg-sostituito. Ne sono riportate due applicazioni, entrambe basate sul concetto di drug delivery. Nanocristalli di Idrossiapatite sono stati utilizzati per adsorbire e ritenere sulla loro superficie farmaci chemioterapici basati su complessi di Platino, e successivamente rilasciare il farmaco in risposta ad una variazione di pH. Alcuni principi attivi fitoterapici sono stai stabilizzati tramite fisisorbimento sulla superficie di particelle di Calcio fosfati in sospensione. La loro applicazione ha dimostrato buoni risultati curativi sulle piante, utilizzando quantitativi di principio attivo molto ridotti rispetto ai prodotti commerciali.
D'Amen, Eros <1985>. "Synthesis and Characterization of Functional Inorganic Nano-Micro Particles and their Role in Innovative Practical Applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7622/.
Повний текст джерелаIn questa tesi sono riportate sintesi e caratterizzazione di nano-micro particelle di materiale cristallino inorganico, e quattro loro applicazioni. Le particelle inorganiche sono state preparate seguendo due criteri principali: i) le proprietà chimico-fisiche delle particelle devono essere ottimizzate in funzione dell’applicazione; ii) sintesi e applicazione devono essere basate su procedure semplici, con basso impatto ambientale ed economicamente sostenibili. In particolare, nano particelle di Titanio biossido sono state sintetizzate tramite reazione di idrolisi di Titanio(IV) isopropossido in una soluzione di acqua a alcol isopropilico. L’alcol isopropilico presente nella miscela di solventi agisce da agente cappante stabilizzando le nanoparticelle in formazione e dimostra un ruolo nella stabilità della sospensione. Il Titanio biossido prodotto ha rivelato buone proprietà foto catalitiche senza bisogno di ulteriori trattamenti termici. Il Titanio biossido foto attivo è stato applicato con buoni risultati nell’abbattimento di NOx dalle emissioni di uno stabilimento e come strato autopulente su dei pannelli fotovoltaici. Sono state sintetizzate nano e micro particelle di calcio fosfati cristallini, nello specifico Idrossiapatite, Brushite, Monetite and β-Tricalcio fosfato Mg-sostituito. Ne sono riportate due applicazioni, entrambe basate sul concetto di drug delivery. Nanocristalli di Idrossiapatite sono stati utilizzati per adsorbire e ritenere sulla loro superficie farmaci chemioterapici basati su complessi di Platino, e successivamente rilasciare il farmaco in risposta ad una variazione di pH. Alcuni principi attivi fitoterapici sono stai stabilizzati tramite fisisorbimento sulla superficie di particelle di Calcio fosfati in sospensione. La loro applicazione ha dimostrato buoni risultati curativi sulle piante, utilizzando quantitativi di principio attivo molto ridotti rispetto ai prodotti commerciali.
Liu, Jing. "Carbon nanotube/polymer composites and novel micro- and nano-structured electrospun polymer materials." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/22673.
Повний текст джерелаCommittee Chair: Kumar, Satish; Committee Member: Carr, Wallace; Committee Member: Graham, Samuel; Committee Member: Griffin, Anselm; Committee Member: Yao, Donggang.
Dong, Bin. "Controllable synthesis for fabrication of micro/nano-structured mesoporous precursor particles for high performance lithium-ion batteries." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52091/.
Повний текст джерелаNasseh, Marjan. "Improved Reverse Micelle method for the green synthesis of pH sensitive solid CaCO3 micro/nano scale particles." Thesis, Nasseh, Marjan (2021) Improved Reverse Micelle method for the green synthesis of pH sensitive solid CaCO3 micro/nano scale particles. Masters by Research thesis, Murdoch University, 2021. https://researchrepository.murdoch.edu.au/id/eprint/65262/.
Повний текст джерелаWilliams, Craig J. "Engineered micro to nano scale surface structures with the potential to influence stem cell interactions." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.548775.
Повний текст джерелаGiehl, Zanetti Betina. "Evaluation du potentiel d'utilisation d'un polyuréthane obtenu à partir d'un polyol d'origine natuel comme matériel polymérique pour la micro et nano encapsulation d'agents actifs." Bordeaux 1, 2006. http://www.theses.fr/2006BOR13153.
Повний текст джерелаPeng, Haonan. "Synthesis of spin crossover micro-and nano-particles and study of the effect of their sizes and morphologies on their bistability properties." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30082/document.
Повний текст джерелаNowadays, the idea that molecule can be used as an active element in an electronic device stimulates scientific activity of chemistry and physics laboratories worldwide. The information storage capacity from technological demands is growing exponentially, which relies much on the development of nanosciences. The objective is to store data as quickly as possible in a device as small as possible. One of the most promising strategies is based on the concept of molecular bistability, the switching between two electronic states of a molecule in the same way that a binary switch. It is thus possible to pass in a reversible and detectable manner from one state (OFF = 0) to another state (ON = 1) under the influence of a controlled external stimulus. The spin transition (ST) phenomenon that switches the system between high spin (HS) and low spin (LS) states is a typical example of molecular bistability. The two states can be distinguished with different magnetic, optical and structural properties and can be induced by an external perturbation like the temperature, the light, the pressure, a magnetic field or the inclusion of a guest molecule. When the structural changes associated with the spin transition are transmitted in a cooperative manner across the network molecules, the transitions will occur with steepness and possibly accompanied by hysteresis loop (the first order transition). So, spin transition molecular materials should offer many opportunities in terms of applications in the field of electronics, information storage, digital display, photonics and photo-magnetism. Among the different families of compounds, coordination polymers arouse much interest due to their bistability near room temperature. The judicious choice of ligands and counter-anions make possible to modulate the final properties of these compounds and even in some cases to synergistically combine different physical properties. The work developed in this thesis attempt to address the different issues related to the challenge of coordination polymers based nanoscale materials with spin transition. The synthesis of inorganic bistable materials, their development in micro- and nanoparticles, thin layers, their organization and their physical properties are shown. The materials in the microscopic scale have mostly the same physical properties as those measured at the macroscopic scale. However, at the nanoscale, materials can exhibit physical properties that are far from those of bulk compounds. It is therefore imperative to understand more about the phenomena related to material size decrease to develop nanotechnology. The fundamental study of these nanomaterials is necessary and represents a major challenge today, which is of prime importance for the development of future applications. The development of nanoscale materials through the control of certain systematic models permits to improve our understanding of specific effects at the nanoscale. For example, in the case of spin crossover complex, the most important question is: how downsizing effect influences the transition temperature, the cooperativity and the width of hysteresis loop? In this context, this thesis is devoted to the design and the synthesis of various size spin crossover nano and micro-materials with different morphologies. To accomplish this, we developed the reverse-micelle technique and adopted innovative matrix-free synthetic approaches
Delshadi, Sarah. "Tests de diagnostic immunologique rapides combinant des nanoparticules magnétiques et des micro-aimants structurés." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAV070.
Повний текст джерелаThis thesis reports the development of innovative, sensitive and fast immunoassays combining functionalized superparamagnetic nanoparticles (SPN) and micro-magnets. Our magnetic immunoassays exploit high gradients generated by micro-magnets to capture immune-complexes captured on SPN. Magnetic attraction is widely used in biotechnology, because it provides long-range forces able to capture molecules of interest. Bead-based immunoassays use common centimetre-scale magnets to attract micro-particles. Those magnets generate low magnetic gradients and struggle to capture superparamagnetic nano-particles, which are too small and mobile to be efficiently trapped. Down-scaling the size of magnetic particles is very interesting since it allows diffusion-based transport to perform faster reactions, while avoiding particle sedimentation and aggregation. Furthermore, it increases the reaction surface, which improves the sensitivity of immunoassays. Thanks to the scaling law effects micro-magnets from Institut Néel generate high local gradients and therefore large magnetic volume forces: we use this innovative technology to develop fast immuno-assays that take advantage of a radical size reduction, compared to commercial technology.We first developed a colorimetric magnetic immunoassay (MagIA) as a new approach to standard ELISA. A proof-of-concept based on colorimetric quantification of anti-ovalbumin antibody in buffer was performed and compared with conventional ELISAs. After optimization, MagIA exhibits a limit of detection and dynamic range similar to ELISAs developed using the same biochemical tools. Micromagnets made by the micro-magnetic imprinting method can be fully integrated in multi-well plates at low cost, allowing the efficient capture of immuno-complexes carried by SPNs. The method is generic and performs magnetic ELISA in 30 min.We then developed a magnetically localized fluorescent immunoassay (MLFIA) exploiting the local capture of SPN on micro-magnets. The differential measurement of fluorescence localized on and besides micro-magnet arrays allows the detection and quantification of a molecule in only 15 minutes without fluid handling. We present a proof of concept based on the detection of monoclonal antibody anti-ovalbumin. Functionalized nanoparticles are incubated with fluorescent detection antibody and the sample containing the molecule to be detected. After a single incubation step, the nanoparticles are captured on micro-magnets made by thermo-magnetic patterning. Fluorescence is then read under a microscope. Differential measurement between the signal from the immunological complex localised on the micro-magnets and the non-specific signal localised besides micro-magnets allows the quantification of mAb anti-OVA. The performance of MLFIA was compared with conventional ELISA and exhibits a limit of detection up to 100 times better for anti-OVA mAb in PBS. For further validation, MLFIA was used to measure clinical parameters: we developed a sandwich assay to detect C-reactive protein, and a serology for Toxoplasma gondii immunoglobulin G and M or osteopontin in human samples. Comparisons with data obtained with routine clinical automatized methods show excellent correlation. Our MLFIA technology presents several key advantages: it is compatible with biological media (serum, plasma), uses small volumes and requires little energy. It also is versatile and thus can be used to detect any antigen or antibody in complex media. We are currently developing a portable prototype for point-of-care diagnostics. The results will open the way to a new generation of sensitive immunological lab-on-chip
Bhadri, Shweta. "Potential Involvement of Micro vesicle Particles in the Synergistic Effects of Ultraviolet-B Radiation and Platelet -Activating Factor Receptor Agonists on Cytokine Production." Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1622205404246803.
Повний текст джерелаCao, Hong Ha. "The fabrication process of microfluidic devices integrating microcoils for trapping magnetic nano particles for biological applications." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112150/document.
Повний текст джерелаIn this study, a concept of microfluidic chip with embedded planar coils is designed and fabricated for the aim of trapping effectively functionalized magnetic nanobeads and immobilizing antibody (IgG type). The planar coils as a heart of microfluidic chip is designed with criterion parameters which are optimized from simulation parameters of the maximum magnetic field, low power consumption and high power efficiency by FE method. The characterization of microcoils such as effectively nanobeads (300 nm) at low temperature (<37oC) is performed and confirmed. The channel network in PDMS material is designed for matching with entire process (including mixing and trapping beads) in microfluidic chip. A process of PDMS’s surface modification is also carried out in the assemble step of chip in order to limit the non-specific adsorption of many bio substances on PDMS surface. The microfluidic chip assemble is performed by using some developed techniques of reversible packaging PDMS microfluidic chip (such as stamping technique, using non-adhesive layer, oxygen plasma combining with solvent treatment). These packaging methods are important to reused microchip (specially the bottom substrate) in many times. The immobilization of antibody IgG-type is performed inside microfluidic chip following the standard protocol of bead-based ELISA in micro test tube. The result showed that IgG antibodies are well grafted on the surface of carboxyl-beads (comparing to result of standard protocol); these grafted antibodies are confirmed by coupling them with labeled second antibody (Fab-FITC conjugation)
Leulmi-Pichot, Selma. "Destruction de cellules cancéreuses par vibrations magnéto-mécaniques de micro/nano particules magnétiques : Elaboration des particules par approche top-down, biofonctionnalisation et tests in-vitro." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY063/document.
Повний текст джерелаIn the coming years, the treatment of serious diseases (cancer, brain diseases, etc.) could benefit more intensely from advances in materials science and nanotechnology. From the medical point of view, it is well known that cancer cells tend to develop resistance to chemotherapy, and the side effects encountered seriously limit the effectiveness of treatments. For these reasons, the search for alternative therapies that target cancer cells without affecting healthy tissues is currently one of the most active areas of research on cancer. In this context, magnetic nanoparticles are receiving an increasing interest in a variety of applications ranging from biomedical diagnostic to targeted treatments. Indeed, due to their remote actuation by external magnetic fields, the magnetic particles have the ability to locally perform actuations on targeted biological species.This thesis describes an approach based on interfacing cancer cells with bio-functionalized magnetic particles. When these particles are bound to the cancer cells, applying an external alternating magnetic field induces the particles oscillations, which then transmits a mechanical stress to the cancer cells.For this application, specific magnetic particles were prepared. Unlike conventional magnetic particles made by chemical routes ("bottom-up"), the particles studied in this thesis have been specially designed by techniques used in micro / nanoelectronics ("top-down"). Thus, two types of magnetic particles were compared; synthetic antiferromagnetic particles (SAF) consisting of magnetic multilayer stacks and microparticles consisting of a single magnetic layer with a magnetic vortex configuration.Once these particles released in a solution, the self-polarization phenomenon that contributes to the agglomeration / dispersion of these particles by magnetostatic interactions were compared for both types of particles as well as the mechanical torques that they can exert on cancer cells when subjected to an external magnetic field.Although SAF particles generate higher torques, finding biocompatible materials that may replace the constituents of the magnetic stack remains difficult, while vortex-particles would be easier to make in magnetic iron oxides.By exploiting the properties of NiFe magnetic vortices, we have developed an approach for the targeted destruction of the human renal carcinoma cells. The tests launched in vitro show that the magneto-mechanical stimulus creates two dramatic effects: a significant decrease in the rate of alive cancer cells, and the initiation of the apoptosis (programmed cell death). These results were achieved by applying low field values (~ 100 Oe i.e.10mT) at low frequencies (~ 20 Hz). Studies for the quantification of cell death by flow cytometry were conducted. The results already obtained even at the stage of "proof of Concept" are very encouraging for new perspectives of cancer therapies
SHIVAKUMAR, YOGESH. "Development of novel approaches to modulate the immune response. Analysis of the effects of triggering the ICOS ligand and use of biocompatible/biodegradable nano/micro particles loaded with immunomodulatory molecules." Doctoral thesis, Università del Piemonte Orientale, 2015. http://hdl.handle.net/11579/115576.
Повний текст джерелаVenkataraman, Manoj. "THE EFFECT OF COLLOIDAL STABILITY ON THE HEAT TRANSFER CHARACTERISTICS OF NANOSILICA DISPERSED FLUIDS." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3656.
Повний текст джерелаM.S.M.S.E.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Materials Science and Engineering
Kaufman, Joshua. "Multifunctional, Multimaterial Particle Fabrication Via an In-Fiber Fluid Instability." Doctoral diss., University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6297.
Повний текст джерелаPh.D.
Doctorate
Optics and Photonics
Optics and Photonics
Optics and Photonics
Pryor, Donald Edward. "Synthesis and Bioactivity Studies of Nanoparticles Based on Simple Inorganic and Coordination Gallium Compounds as Cellular Delivering Vehicles of Ga(III) Ions for Potential Therapeutic Applications." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1543554532063877.
Повний текст джерелаViapiana, Raqueli. "Physicochemical and mechanical properties, bioactivity potential and characterization of the dentin-sealer interface of experimental root sealers based on portland cement with micro and nano particulate radiopacifiers = Propriedades físico-químicas e mecânicas, potencial bioativo e caracterização da interface dentina-cimento de cimentos endodônticos experimentais à base de cimento Portland associados à radiopacificadores micro e nanoparticulados /." Araraquara, 2014. http://hdl.handle.net/11449/122166.
Повний текст джерелаBanca: José Mauricio dos Santos Nunes Reis
Banca: Josette Camilleri
Banca: Marcos Húngaro Duarte
Banca: Loise Pedrosa Salles
Resumo: O cimento Portland é constituído por silicato de cálcio e a associação com aditivos e veículos conferem características que podem viabilizar seu uso como cimento endodôntico. No entanto, o cimento Portland não apresenta radiopacidade própria, o que torna necessário a adição de um agente radiopacificador à mistura para ser utilizado como material dentário. O objetivo deste estudo foi avaliar as propriedades físico-químicas e mecânicas, o potencial bioativo e caracterizar a interface dentina-cimento de cimentos endodônticos experimentas à base de cimento Portland (ES) contendo nano ou micro partículas de óxido de zircônio ou óxido de nióbio. O tempo de presa, resistência à compressão, escoamento, espessura de filme, radiopacidade, solubilidade e estabilidade dimensional foram avaliadas de acordo com a norma ISO 6876:2012, enquanto que a liberação de fomaldeído foi avaliada por meio de cromatografia gasosa. A resistência de união dentinária foi avaliada por meio de teste push-out e tanto a caracterização da microestrutura dos cimento quanto a análise do potencial bioativo foram realizadas utilizando energia dispersiva de raios-x, difractometria e espectroscopia infravermelha. A interface dentina-cimento foi avaliada com relação à penetração de microesferas fluorescentes e examinada em microscopia confocal e microscopia eletrônica de varredura associada à escaneamento por energia dispersiva de raios-x linear. Os dados foram submetidos aos testes ANOVA e Tukey (p < 0,05). Com exceção da radiopacidade, os ES apresentaram propriedades físico-químicas de acordo com as especificações ISO 6876, adequada resistência de união à dentina, potencial bioativo e promoveram selamento coronário e interação química com a dentina.
Abstract: Portland Cement is composed by calcium silicate and the association with additives or vehicles, may confer characteristics to enable the use of this cement as root canal sealer. However, Portland cement lacks in radiopacity which requires the addition of a radiopacifying agent to the mixture to be used as dental material. The purpose of this study was to assess the physicochemical and mechanical properties, the bioactivy potential and to characterize the dentin-sealers interfaces of Portland-based experimental root canal sealers (ES) containing nano or micro particles of zirconium oxide or niobium oxide. Setting time, compressive strength, flow ability, film thickness, radiopacity, solubility and dimensional stability were evaluated according to ISO 6876:2012 standards, whereas formaldehyde realease was investigated using gas-cromatography. Dentin bond strength was evaluated by push-out test and the sealer's microestruture and bioactivity potential were perfomed using X-ray energy espectroscopy, X-ray diffractometry and infrared spectroscopy. Dentin-sealers interface was assessed with respect to fluorescent microspheres penetration and it was also examined using confocal microscope and scanning electron microscope coupled to X-ray energy dispersive line scans. Data were analyzed by ANOVA and Tukey post-hoc test (p < 0.05). With the exception of radiopacity, ES showed physicochemical properties according to ISO 6876:2012 specifications, adequate dentin bond strength, great bioactivity potential and promoted coronal sealing and chemical interaction with dentin.
Doutor
Gupta, Manoj Kumar. "Exploration of potential of nano and micro particles of solid lubricants for enhancing the tribo performance of oil." Thesis, 2017. http://localhost:8080/xmlui/handle/12345678/7543.
Повний текст джерелаSu, Qing-zhang, and 蘇慶章. "The preparation of nano gold particles with micro fluid reactor." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/51373828486967200368.
Повний текст джерела正修科技大學
化工與材料工程研究所
96
First, to preparation the nano gold particles with batch, and found the best reactants and conditions from preparation the nano gold particles. To preparation the nano gold particles with three kinds of microfluidic﹑T type reactor and AA sprinkle-nozzle in this study. The nano gold particles determined the particle size with nano zetasizer. To compare the nano gold particle size with this four kinds. To analyze the optical character and examine the nano gold particles with ultraviolet-visible spectrophotometer and fluorimeter. At last, to examine the nano gold particle size and shape with transmission electron microscope. The best condition to preparation the nano gold particles with batch for the smallest particle size is around 6 nm;The microfluidic already made can achieve about 21 of X/Y ; the nano gold particle size composed by microfluidic is around 100 nm in min; the nano gold particle size composed by T type reactor is around 1-3 nm in min; the nano gold particle size composed by AA sprinkle-nozzle is around 1-3 nm in min; The ultraviolet-visible spectrophotometer have peak in 520 nm, and it have the character of surface plasmon resonance; The fluorimeter can be known nano gold particle contained Au5﹑Au8 and Au13. TEM can be known round nano gold particle size below 10nm.
Rong-FengHu and 胡榮峰. "Fabrication of Micro- and Nano-chitosan Particles Using Electrohydrodynamic Atomization." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/13241994771181587303.
Повний текст джерела國立成功大學
化學工程學系碩博士班
98
Chitosan micro/nanoparticles have been successfully produced using the electrohydrodynamic atomization (EHDA). In this study, the choices of solvent play an important role. Trifluoroacetic acid (TFA) has been used as the solvent for chitosan because of the lower value of surface tension. The effect of applied voltage, distance between the electrodes and flow rate on the morphology and the particle size distribution were investigated systematically. A chitosan solution having a low concentration could be used to prepare chitosan particles during a suitable electric distance. The size of the fabricated particles decreased with increasing applied voltage as well as decreasing flow rate. By using Taguchi Methods, the strategy for a controlled size and narrow size distribution were developed. A suitable scaling law, which allow for prediction of the size of the produced polymer particles based on the polymer weight fraction and electrohydrodynamic atomization process parameters, were formulated and tested. The relative error value was -8.15 %.
Tsai, Min-Chien, and 蔡旻謙. "Self–Assembly of Micro/Nano Particles by using Dielectrophoretic Force." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/76008730307132562934.
Повний текст джерела國立成功大學
微機電系統工程研究所
93
This paper describes a method for self-assembly of micro/nano particle by using dielectrophoretic force. In this paper of parameters, including voltage and frequency of driving signal are studied to optimize the performance of the particle assembly. 25μm and 10μm diameter latex particles are chosen in this study. CCD camera is used to record image sequence.Electrodes are fabricated by using Micro Electro Mechanical System technology being particle assembly. Before bonding of polydimethylsiloxane (PDMS) film. O2 plasma is used to treat dielectrophoretic self-assembly chip surfaces, which cause the surface becoming hydrophilic. The experimental results show that the latex particle are assembled in 200μm and 500μm assembly region with driving signal V = 20(V)、f = 1.125 (MHz)、V = 250(V) and f = 1.125 (MHz). Quadrupole electrodes are excited with alternating voltages, and latex particle are assembled in the 400μm × 400μm assembly region, which is defined by PDMS film. Finally, a driving signal with voltage of V = 6.75(V) and frequency of f = 1.125 (MHz) are found to be optimize condition for the latex particle assembly. Hexapole electrodes are excited with a driving signal with voltage of V = 6.75(V) and frequency of f = 1.125 (MHz), and latex particle are assembled in the 100μm × 100μm assembly region.The experimental results under this driving signal, the latex particles can self-assembly into a organized structure which can provide beneficial guide for self-assembly of micro particle into form.
Zhi-FanChen and 陳治帆. "The impact analysis of Micro-/ nano-particles suspended in Atmospheric environment." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/458xsr.
Повний текст джерела國立成功大學
工程科學系
103
The rapid development of human society so that environmental issues become increasingly prominent, which the air quality in Taiwan and tropical cyclones have a considerable impact on Taiwan's meteorological environment. Taiwan summer tropical cyclone is a higher fre-quency of occurrence of severe weather, all areas of life in Taiwan will have a significant impact. This study use WRF(Weather Research and Forecasting)and Coupled chemical systems (WRF-Chem3.5),that is the latest release Non-hydrostatic equilibrium mesoscale numerical prediction model in this study and use Fick's laws of diffusion to calculate mo-lecular diffusion coefficient of molecular diffusion capacity of the physical substance. In this study, the rear section of Taiwan EPA air quality data written WRF-Chem Simulation. Simulation of April 20, 2015 to the distribution of pollutants every other day,using gas phase chemistry model simulations of SO2, NO2, CO, O3, PM10, PM2.5 and other pollu-tants, the use of aerosol model simulations of PM10 and PM2.5,Find PM10 and PM2.5 aerosol model of forecasting of PM10 and PM2.5 Compared to the gas phase chemistry is accurate,But the simulated value significantly higher in the station observations.
Gokhale, Abhijit Aniruddha. "Synthesis of nano/micro particles using supercritical method and particle characterization." Thesis, 2003. http://library1.njit.edu/etd/fromwebvoyage.cfm?id=njit-etd2003-087.
Повний текст джерелаTeng, Chih-Chun, and 鄧至均. "Studies of Poly (vinyl chloride) and Polyethylene Blended with Micro/Nano Particles." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/02188074778699234299.
Повний текст джерела南台科技大學
化學工程系
92
This study contains three sections. The first section is study of rigid poly (vinyl chloride) compounds blending with clay. The second section is study of rigid poly (vinyl chloride) compounds blending with micro/nano-CaCO3. The third section is study of high density polyethylene blending with micro/nano-CaCO3. In the first section, PVC/clay nanocomposites were successfully prepared by a Haake torque rheomix and examined by XRD and TEM. The fusion properties showed that the fusion time and the fusion temperature were increased, but the fusion torque was decreased, with the content of organic clay was increased. The opposite effect was occurred when the untreated clay was used. From the thermal results, the glass transition temperature of nanocomposite was increased and the thermal stability was decreased. From the mechanical property analyses, it showed that the clay improved the yield strength and elongation of two kinds of PVC/clay nanocomposites. The Young’s modulus of PVC/untreated-clay nanocomposite was increased. On the other hand, the organic clay had the opposite effects due to the organic chemical between the silicate layers and resulted in the Young’s modulus decreasing. In the second section, the fusion properties showed that the loading torque, the loading temperature, and the fusion torque were decreased with the content of calcium carbonate was increased. But the fusion time and fusion percolation threshold were increased with the content of calcium carbonate was increased. The effect of the nano-CaCO3 was more significant than that of the micro-CaCO3. From the thermal properties, Tg and thermal stability of PVC/CaCO3 nanocomposites were increased with the content of nano-CaCO3. The 10phr nano-CaCO3 had the best result. On the other hand, the micro-CaCO3 caused the opposite results. The SEM morphology results showed that CaCO3 were dispersed in the composite and resulted in voids. The PVC/nano-CaCO3 nanocomposites exhibited lightweight and good properties. In the third section, the variation is different kind of CaCO3, the content of CaCO3, and powder or pellet type HDPE. The fusion properties showed that the lower loading torque and the higher fusion time resulting from the HDPE powder. The HDPE/nano-CaCO3 nanocomposites displayed the higher loading torque and the shorter fusion time than those of the HDPE/micro-CaCO3 composites. From the TGA results, it showed the thermal stability of HDPE/nano- or micro- CaCO3 composites were improved, especially for the nano-CaCO3. From the DSC non-isothermal crystallization analysis, the crystallization temperature of HDPE was increased with the content of CaCO3 was increased. It implied the crystallization rate of HDPE was increased. The crystallinity of HDPE was decreased with the content of CaCO3 was increased. The melting point of HDPE was decreased due to its crystallinity was decreased.
Nie, Zhihong. "Developing New Strategies for the Preparation of Micro- and Nano-structured Polymer Materials." Thesis, 2008. http://hdl.handle.net/1807/16729.
Повний текст джерелаLin, Yu-Yan, and 林育彥. "Precision Coating Die Design for Suspensions: Organic/Inorganic Particles in Micro/Nano Scale." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/67278430716893472625.
Повний текст джерела國立清華大學
化學工程學系
98
Coating solutions with a significant amount of solid particles added are not unusual for many industrial applications. Products such as backlit films, diffusers for LCD panels, CIGS solar cells are just a few examples. Two issues arise for delivering such solutions, i.e. the solutions may have yield stress and particle sedimentations may appear in the manifolds for conventional coat-hanger or T-dies. There are experimental evidences that clearly indicate that particle sedimentation can be serious in the manifold on the die. A die that can maintain relatively high shear ratse in the manifold can improve this precipitation problem. The purpose of this research is to design a coat-hanger die which has a shallow manifold with rectangular cross-sectional area. Therefore, flow field with high shear rate can be achieved. Due to the high cost of traditional coat-hanger die, this research also propsed a new idea-using two easily-replaced shims to make a die, this design can effectively reduce the cost of manufacture. Both the theoretical modeling and the experimental verifications were carried out for die design. The coating solutions were assumed to obey the Bingham viscoplastic model. A mathematical model based on the 1D lubrication approximation, 2D Hele-Shaw flow and 3D flow simulations were developed to predict the performance of the new design, the computer-aided solutions by the finite difference (FDM) and the finite element method (FEM) could be obtain. The performance of the design based on the lubrication approach is in agreement with the 3D simulation and experimental results, therefore the new die can develop uniform flow and no stagnent zone can exist in the end of the manifold, so that the sedimentation can be avoided. We also compared the sedimentation and uniformity of our design to a commercial T-die and fishtail die experimentally, the results indicated the performance of our design is excellent, sedimentation and uniformity problem appeared in both the T die and fishtail die. The design of our research can be applied to the wet coating process of CIGS solar cell & TCO films.
Puri, Puneesh Yang Vigor. "Multi scale modeling of ignition and combustion of micro and nano aluminum particles." 2008. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3183/index.html.
Повний текст джерелаTu, Cheng-Wen, and 涂政雯. "Application of High Gradient Magnetic Separation for Recovery of Magnetic Micro-nano Particles." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/41396866748695148325.
Повний текст джерела國立臺灣大學
環境工程學研究所
99
This study investigated the recovery of magnetic micro-nano particles using high-gradient magnetic separator (HGMS). The major system parameters examined, include: inlet concentration of magnetic particles (MP) in the solution (CLF,i), volumetric flow rate (QL), magnetic field gradient (▽H), particle size (dp) and other parameters, such as packing density of magnetic media filled in the magnetic separation chamber (ρF). The separation efficiency(ηM), effective separation time (tB) and saturation time of separation chamber by the system parameters were evaluate. The mainly target particles studied were superparamagnetic particles of SM (SiO2/Fe3O4). For exploring the effects of particle size ,the magnetic Fe3O4 particles with sizes of 5-20,20-30 and 40-60 nm were employed. The magnetic SM particles were prepared using the sol-gel method, yielding the saturation magnetization of 23.19 emu g-1and particle size of 70-80 nm. The results indicate that a lower QL offers a longer tB and a better ηM for the HGMS. Also, a lower CLF,i of MP allows a large capture radius of magnetic media (rCF), resulting in a longer and a better ηM.The magnetic separation chamber filled with the magnetic media with a high ρF, provides higher magnetic field strength H and magnetic field gradient ▽H for the external magnetic field, and thus a higher ηM. Further, the capture of magnetic particles size with larger tends to reach saturation more easily. Therefore, the limitation of particle size should be considered for the capture of MP using HGMS. The multi-wire dynamic model was employed to simulate the performances of HGMS. Comparisons of experimental data and prediction indicate satisfactory agreement. The model can be used to predict the tB, optimum QL and other operating parameters, as well as the breakthrough curves. The results illustrate that the saturated magnetic matrix capacity of separation chamber is inversely proportional to the QL and CLF,i, however, is proportional to the magnetic field gradient. In practice, the model can be applied to simulate the real plant operation. The results may be used for the proper control of switching the magnetic field, thus avoiding the excessive loss of magnetic particles, and the secondary pollution to the environment.
ROVIGATTI, LORENZO. "Role of the anisotropy in the interactions between nano- and micro-sized particles." Doctoral thesis, 2012. http://hdl.handle.net/11573/918848.
Повний текст джерелаCHANG, CHIA-CHI, and 張佳奇. "Thermal Conductivity of Epoxy Composites With Ag Particles Doped Al2O3 Micro/nano Fibrous Fillers." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/60210962430892487244.
Повний текст джерела國立高雄應用科技大學
化學工程與材料工程系博碩士班
104
As the development of electronic components in the direction of miniaturization, high-power, and high integration, it requires more and higher performance, so the waste heat generated by the operation of components, need to be ruled out quickly, otherwise it will reduce the performance of electronic components. High thermal conductivity polymer composite materials with high thermal conductivity and high-performance are the most widely used in electronic components. This study is using electrospinning method to prepare high thermal conductivity micron network Al2O3-Ag fillers, and applied to enhance thermal conductivity of Al2O3-Ag/epoxy composites. Commonly, to enhance thermal conductivity of polymer matrix composite via a large amount of thermal conductivity powders loading in matrix (ex: AlN). From the images of SEM, indicated the Al2O3-Ag fillers with 1-D micron network structure and high aspect ratio (> 50), and identified as cubic system Ag and rhombohedral system Al2O3 by XRD and TEM. From the spectra of FT-IR, confirmed the material surface grafted with siloxane. By a four-point probe tester detected the volume resistivity value, confirmed the Al2O3-Ag/epoxy composites is non-conductive material. The Al2O3-Ag/epoxy composites using a thermal conductivity meter (Hot-Disk) to detect the heat transfer coefficient, was prepared the Al2O3-Ag fiber and modified Al2O3-Ag fibrous fillers, as 50 wt% addition amount of epoxy composite, the thermal conductivity were 0.77, 0.60 W/mK, respectively. And had 285% and 200% enhancement in thermal conductivity, respectively. This conclusion can be observed the filler which were modified has the better thermal conductivity, by using SEM observe the surface morphology of cross section can be found within the composites material is modified through the addition of materials and organic substrates interface significantly reduced, which can be attributed to the additional material bonded with an epoxy resin. DMA detects storage modulus and glass transition temperature, in addition to silane internal substrate material can effectively inhibit crack growth and storage modulus increases, but because of this situation hinders the crosslinked epoxy resin.
Persico, Paola. "Additivation of polyamide fibers by means of micro- and nano-particles containing jojoba oil." Tesi di dottorato, 2006. http://www.fedoa.unina.it/970/1/Tesi_Persico_Paola.pdf.
Повний текст джерелаWen, Cheng-Che, and 溫政哲. "Reverse microemulsion-based synthesis of chitosan micro-/nano-particles for enzyme immobilization and derived applications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/af5vyu.
Повний текст джерела國立交通大學
應用化學系碩博士班
102
In this study, the reverse microemulsion system, consisting of water, Triton X-100, hexanol and methylcyclohexane was applied for the synthesis of chitosan nanoparticles (CNPs), chitosan-HRP complex nanoparticles (C-HRP-cNPs) and chitosan microcapsules (CMCs). The physical properties such as the morphology and the diameter of these three kinds of chitosan materials were characterized by confocal laser scanning microscope (CLSM), scanning electron microscope (SEM) and dynamic light scattering (DLS). Our study indicated that the size control of CNPs could be achieved by temperature adjustment; while varying chitosan concentration and the ratio of incorporated HRP influenced significantly the morphology and the stability of CNPs and C-HRP-cNPs . To investigate the feasibility of three chitosan-based solid supports for enzyme immobilization, horse radish peroxidase (HRP) was employed as the model enzyme. Surface modified HRP-Chitosan nanoparticles (surHRP-CNPs), C-HRP-cNPs , and Encapsulated-HRP Chitosan nanocapsules (eHRP-CMCs) were prepared, and the total enzyme amounts and the corresponding activity of immobilized HRP were quantified to evaluate the immobilization processes. Different synthetic conditions contributed to varied quantity and stability of immobilized HRP in each type of chitosan nanomaterials. Finally, we employed the HRP-immobilized chitosan nanomaterials as signal generator for the immunoassay applications. The ligand recognition interface and the performance of signal generation in the assay were found to be greatly influenced by the different fabrication procedures of chitosan nanomaterials.