Dissertations / Theses on the topic 'Particle Picking'
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Holmgren, Joanna. "Induced Seismicity in the Dannemora Mine, Sweden." Thesis, Uppsala universitet, Geofysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-267361.
Full textWüstner, Cornell. "Selbstorganisierte Strukturen mit Saturn-Partikeln." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-157631.
Full textBrunier, Barthélémy. "Modeling of Pickering Emulsion Polymerization." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10320/document.
Full textThe aim of the present project is to develop a methodology for fundamental modeling of surfactant-free emulsion polymerization processes stabilized by inorganic particles, referred to as “Pickering emulsion polymerization”. Modeling emulsion polymerization systems requires modeling the particle size distribution (PSD), which is an important end-use property of the latex. This PSD includes submodels dedicated to particle nucleation, mass transfer between the different phases (monomer, radicals, stabilizer), and particle coagulation. These models should preferably be individually identified and validated experimentally. The first main part of the work is dedicated to the experimental study. This part can be divided in three parts. The first part describes the adsorption of inorganic particles on polymer without reaction. Multilayer adsorption was observed and B.E.T. isotherm was able to describe this adsorption. The adsorption was found to be enhanced at higher ionic strength. The adsorption dynamics were found fast and therefore clay partitioning can be considered at equilibrium during polymerization. The second part concerned the investigation of different reaction parameters on the particles number and reaction rate in ab initio polymerizations. The effect of mixing, initial monomer concentration and initiator concentration were considered. Optimization of these conditions was useful for the modeling part. The last part described the differences between several LaponiteR_ grades through the ab initio emulsion polymerization of styrene. The second main part of the manuscript focused on the modeling of the Pickering emulsion polymerization. The population balance model and average number of radicals balance were adapted regarding the effect of inxi organic particles. The growth of the polymer particles was optimized by fitting the models of radicals’ entry and desorption described available in literature to the experimental data. No modification was needed, which allowed us to conclude that the clay had no influence on radical exchange. However, LaponiteR_ stabilization played an important role in polymer particles production. Coagulative nucleation model was able to describe the nucleation rate and predict the total number of particles
Zhou, Yuanyuan. "Oil-dispersed pH-responsive particle as Pickering emulsifiers." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/17380/.
Full textLazrigh, Manal. "Floating photocatalytic Pickering emulsion particles for wastewater treatment." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19527.
Full textDuffus, Laudina Jeneise. "Edible pickering emulsion technology : fabrication of edible particle stabilised double emulsions." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7456/.
Full textWilliams, Mark. "Polymer-modified inorganic particles : versatile Pickering emulsifiers for microencapsulation applications." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/6633/.
Full textReeves, Matthew. "Structure, dynamics and the role of particle size in bicontinuous Pickering emulsions." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/23641.
Full textdifferential dynamic microscopy, DDM), as well as developing a better theoretical model for (multiple) light scattering in a bijel system to arrive at the mechanisms responsible for the anomalous aging, and compare to the predictions of monogelation. Finally, higher magnification/resolution microscopy should be used to look for particle segregation on the liquid-liquid interface (as seen in simulations) and to identify in real-space the locations of the changes in Gaussian curvature over time as measured in Chapter 4.
Li, Keran. "Surfactant-free synthesis of magnetic latex particles." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10211/document.
Full textThis work describes the elaboration of polymer/iron oxide (IO) hybrid latexes through surfactant-free emulsion polymerization. Cationic iron oxide nanoparticles stabilized by nitrate counterions were first synthesized by the co-precipitation of iron salts in water. Magnetic hybrid latexes were next obtained by two polymerization routes carried out in the presence of IO. The first route consists in the synthesis of polymer latexes armored with IO via Pickering emulsion polymerization of methyl methacrylate (MMA) or styrene (St). An auxiliary comonomer (namely methacrylic acid, acrylic acid or 2-acrylamido-2-methy-1- propane sulfonic acid) was used to promote IO particle adhesion to the surface of the generated polymer particles. TEM showed the presence of IO at the surface of the polymer particles and the successful formation of IO-armored polymer particles. TGA was used to quantify the IO incorporation efficiency, which corresponds to the fraction of IO effectively located at the particle surface. The incorporation efficiency increased with increasing the amount of auxiliary comonomer, suspension pH and IO content or with increasing monomer hydrophobicity. In the second route, IO encapsulation was investigated via reversible addition-fragmentation chain transfer (RAFT)-mediated emulsion polymerization. The developed strategy relies on the use of water-soluble amphipathic macromolecular RAFT agents containing carboxylic acid groups, designed to interact with IO surface. The interaction between the macroRAFT agents and IO was investigated by the study of the adsorption isotherms. Both DLS and SAXS measurements indicated the formation of dense IO clusters. These clusters were then engaged in the emulsion polymerization of St or of MMA and nbutyl acrylate (90/10 wt/wt) to form a polymer shell at their surface. Both IO-armored latex particles and polymer-encapsulated clusters display a superparamagnetic behavior
Vasquez, Velado Francisco. "Emulsions de Pickering stabilisées par des particules de bois." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0031.
Full textThe valorization of biomass for high value-added applications is a real scientific, technological and environmental challenge. Valuing wood and stimulating its industrial use towards sustainable applications is a climatic issue: wood and the forest are carbon sinks. The native features of the wood give it hydrophilic and hydrophobic properties for interfacing and stabilizing emulsions. This research is therefore an answer to the question of substitution of surfactants from petrochemicals by natural, renewable and biodegradable materials. Multiparameter studies have made it possible to compare the emulsification and emulsion stabilization efficiency as a function of process (Ultra-Turrax UT technology, Ultra-Sound US technology) and formulation parameters. Stable emulsions are generated from energy expenditure that depends on the technology implemented (3000 kJ.L-1 for the US probe and 6000 kJ.L-1 for UT). In formulation, limits were determined, in particle concentration (0,31 g.L-1 to 2,37 g.L-1), in volume fraction of oil (0,1 to 0,6), in pH (3 to 9) and in salinity (< 2 g.L-1) to delimit zones of better stability of direct emulsions, useful for upscaling studies (> TRL 4). Pathways for modifying the surface properties of wood particles have been addressed to obtain inverse and multiple emulsions. Wood particles are new and powerful candidates for the stabilization of emulsion
Tatry, Marie-Charlotte. "Emulsions de Pickering stimulables stabilisées par des microgels : des interfaces modèles aux propriétés des émulsions." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0222/document.
Full textMicrogels are soft and deformable colloidal particles that are swollen by a solvent and display the ability to deform and adsorb at liquid interfaces. The poly(N-isopropylacrylamide) (pNIPAM) microgels are thermo-sensitive and exhibit a volume contraction when the temperature is raised above the volume phase transition temperature (VPTT). These particle have shown high potential as Pickering emulsions stabilizers: emulsions could be stable at ambiant temperature, below the VPTT and destabilize on-demand above it. To get insight into understanding of the emulsion stabilization mechanism, we systematically discuss the relation between the microgel structure, their adsorption, their organization at model interfaces, the viscoelastic behavior of the interface and the resulting emulsions properties in terms of stability and flow behavior. In the present work, using pNIPAM as model microgels, we investigate the effect of their cross-linking density, their size and their charge density. Varying the microgels structures and the formulation conditions (emulsification process), we could control the emulsions flocculation state and rheological behavior. Based on this knowledge, we propose to synthesize new biocompatible microgels as emulsion stabilizers. Using ligand-modified microgels sucrose-sensitive emulsions may be obtained, enlarging the possible application domains
Barros, Frederico Macedo Fernandes. "Structuration and rheology of Pickering emulsions by the interaction of particles with different degrees of hydrophobicity." Thesis, Le Mans, 2016. http://www.theses.fr/2016LEMA1032.
Full textPickering emulsions have gained interest in many fields of research due their properties like higher stability and versatility. Special attention has been given to the processing of complex and original systems which can be obtained by using different particles. This study consists in the analysis of the different physicochemical parameters of particles, liquid media as well dispersion systems, and their relationship with emulsions structural and mechanical behavior in order to predict and modulate the emulsions characteristics. We studied extensively for the first time the phase diagram of catastrophic and transitional phase inversion of Pickering emulsions. We used silica particles with different structure and hydrophobicity. In particular we showed that mixing particles with different hydrophobicity can finely modulate the phase inversion as well the rheological and structural properties of the emulsions. The manufacturing of emulsified membranes based on previous Pickering emulsions was proposed as an example of the use of these systems as templates for the design of complex materials
Laredj, Bourezg Faïza. "Émulsions stabilisées par des particules polymériques biodégradables : études physico-chimiques et évaluation pour l'application cutanée." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10128/document.
Full textThe so-called Pickering stabilization is based on the use of solid particles instead of emulsifiers. Their strong adsorption at interfaces confers rigidity preventing them from coalescence. This work is divided into four main parts. The first part deals with the manufacture of these particles and their physicochemical characterization. A second part deals with the O/W emulsions formulation according to two different methods and their characterization. The third part is an investigation into the behavior of these particles at the O/W interface by small angle neutron scattering. The last part deals with the evaluation of these emulsions for their application to skin delivery. This work aims at the preparation of Pickering emulsions using biodegradable polymeric particles. Individual particles formed from diblock copolymers such as: PCL-b-PEG and PLA-b-PEG, were made by an innovative nanoprecipitation process. They were characterized in terms of their size and stability. Their internal structure was also investigated by NMR and cryo-TEM. Their ability to stabilize highly concentrated O/W emulsions has been demonstrated. The impact of the emulsification process on the final properties was emphasized and the adsorption of particles as tight necklaces at the interface was visualized by neutron scattering and freeze-fracture electron microscopy. The skin absorption of retinol from these innovative emulsions showed enhanced accumulation of the asset in the stratum corneum compared to conventional surfactant-stabilized emulsions. Such skin absorption of retinol was shown to depend on the manufacturing method of the emulsions. Particles in aqueous suspension were also tested for encapsulation and delivery of retinol in skin. The results showed the influence of the internal structure of the particles (PCL or PLA) on the absorption of retinol in the skin. The use of biodegradable polymers brings new perspectives in the formulation of Pickering emulsions for cosmetic or pharmaceutical use, while avoiding the effects of inorganic particles considered hazardous to human health
Pinaud, Florent. "Etude des propriétés interfaciales et luminescentes de microgels stimulables." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0096/document.
Full textMicrogels are colloidal particles made of cross-linked polymer swollen by a solvent. Soft and porous, they can adapt their swelling degree in response to a stimulus. The main objective of this work is to develop new concepts taking advantage of microgels’ stimuli-responsive properties and intrinsicsoftness while deepening understanding of their properties in solution and at interfaces. Poly(Nalkylacrylamide) microgels are used as a model. Initially our work focused on the study of a new type of electrochemiluminescent (ECL) microgels thanks to the incorporation of a ruthenium complex in the polymer matrix. At the volume phase transition, these microgels exhibit an amplification of the ECL intensity up to 2 orders of magnitude, related to the decrease of the distance between redox sites. This concept is then transposed to saccharides-sensitive microgels and systems bearing two luminophores, an ECL donor and an energy acceptor in order to give rise to resonance energy transfer. The second part of this manuscript is devoted to adsorption of microgels at a planar liquid-liquid interface, to improve knowledge on the origin of the stability of emulsions stabilized by such objects. Such as flexible proteins, microgels can change their conformation at the interface, from an extended to a compressed state, causing variation in the interfacial elasticity. When microgels are adsorbed they can also be functionalized regioselectively in water to produce non-symmetrical microgels, called Janus, able to self-assemble
Destribats, Mathieu. "Emulsions stabilisées par des particules colloïdales stimulables : propriétés fondamentales et matériaux." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00593686.
Full textFrelichowska, Justyna. "Émulsions stabilisées par des particules solides : études physico-chimiques et évaluation pour l'application cutanée." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00370654.
Full text1) l'étude des aspects physico-chimiques des émulsions ; 2) l'évaluation des émulsions stabilisées par des solides pour l'application cutanée.
Les émulsions ont été stabilisées avec des nanoparticules de silice de caractère hydrophobe varié. Les émulsions huile-dans-eau obtenues avec de la silice partiellement hydrophobe ont été caractérisées en termes de stabilité, rhéologie et de quantité optimale de particules nécessaires pour la stabilisation. Les particules de silice hydrophile stabilisent les émulsions H/E avec des huiles très polaires. Le rôle de l'agrégation des particules en présence d'huile et d'électrolyte dans la stabilisation des émulsions a été souligné. Dans un deuxième temps, nous avons étudié l'absorption de principes actifs dans la peau, à partir des émulsions de Pickering, et nous avons comparé les résultats avec les émulsions classiques stabilisées par les tensioactifs. Les émulsions H/E et E/H avec des principes actifs modèles (rétinol comme molécule lipophile et caféine comme molécule hydrophile) ont été étudiées en terme d'absorption dans la peau. L'absorption des principes actifs a été significativement différente pour les émulsions stabilisées par des particules solides et pour les émulsions stabilisées par des molécules de tensioactif. Les émulsions de Pickering constituent une nouvelle formulation pour l'application cutanée.
Boufarguine, Majdi. "Etude de la déformation de gouttes à interface et rhéologie complexes." Phd thesis, Université du Maine, 2011. http://tel.archives-ouvertes.fr/tel-00954404.
Full textBertan, David Willian. "Produção e caracterização de celulose cristalina e amorfa e de partículas de quitosana para aplicação como estabilizantes de emulsões óleo-em-água." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/74/74132/tde-23102018-094939/.
Full textEmulsions are systems formed when two immiscible components are mixed, presenting dispersed droplets in a continuous phase, stabilized by emulsifiers, amphiphilic compounds, with affinities for both phases of the system. In the case of Pickering emulsions, the system is stabilized by solid colloidal particles, which adsorb at the interface of the emulsion droplets. The objective of this dissertation was to produce and characterize suspensions of crystalline cellulose (CC), amorphous cellulose (CA) and chitosan particles (PQ) and to evaluate its potential as single stabilizing compounds in oil-in-water emulsions. CC and CA were produced by heat and acidic treatments of microcrystalline cellulose, respectively, whereas PQs were produced by acidic treatment of medium molecular weight chitosan, also followed by ultra-stirring treatment. In all cases, the treatments were followed by ultra-stirring: 0 (ST); 10,000 (UT10); 15,000 (UT15) or 20,000 rpm (UT20) for 3 minutes. The suspensions of CC, CA and PQ were characterized for determination of particle size distribution, zeta potential and physical stability, and by scanning electron microscopy and/or atomic force microscopy. The powder particles, produced by freeze-drying, were subjected to analysis by X-ray diffraction, Fourier Transform infrared spectroscopy (FTIR) and instrumental colorimetry. As a function of these characterizations, the effect of the stabilizing particle type (CC, CA or PQ) on droplet size, instrumental colorimetry and physical stability of emulsions with 20% (v/v) soybean oil, without and with β-carotene was studied. It was observed that the treatments UT10, UT15 and UT20 caused important changes in the particle size distribution, with reduction of the mean particle size, without significant effect of the agitation speed. Regarding chitosan particles, ultra-stirring treatments did not influence particle size, neither when compared to suspensions without pretreatment. CC was presented as highly unstable cellulosic fiber fragments in suspension, with instability indexes close to 0.78. CA was presented in colloidal particles and irregular aggregates, with reasonable physical stability in suspension (0.26). The suspensions of PQ showed large crystalline structures of sodium acetate, together with colloidal chitosan particles, but highly stable in aqueous suspension (0.04). In general, the potential ζ and the physical stability of CC, CA and PQ suspensions did not change with the treatment (ST, UT10, UT15 and UT20). In the characterization of the freezedried particles, a high crystallinity index of CC (81%) was observed, whereas CA (42%) and PQ (40%) showed low crystallinities. The treatments neither caused significant changes in the chemical structure, analyzed by FTIR, nor in the instrumental color of CC, CA and PQ. Finally, only PQ was able to produce and stabilize oil-in-water emulsions, with no cream phase formation during storage. Addition of 0.005% β-carotene to the oil phase left the emulsions stabilized by PQ slightly orange and increased the physical stability of the emulsions, without affecting the droplet size of the emulsions (29-32 µm). Therefore, only PQ demonstrated the potential to stabilize oil-in-water emulsions, with or without β-carotene.
Lebdioua, Khaoula. "Etude expérimentale et numérique du comportement en suspension de particules de silice amphotères." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0124.
Full textThis study is about the synthesis of amphoteric silica particles and the study of their behaviour in suspension, experimentally and numerically. It presents a thorough study for the synthesis of these particles, with adjustable patch size, using the Pickering emulsion method. Particles are partially modified with aminopropyltriethoxysilane (APTES), in order to obtain different surface charges depending on the pH (positive/negative, neutral/negative or negative/negative). These particles are fluorescent so that they can be observed, as well as their assemblies, by confocal microscopy. Their aggregation at different pH is also studied by means of Brownian dynamics simulations, using the DLVO theory. Simulations are compared to experimental observations, in order to validate these new models, and get a better understanding of the aggregation process of asymmetric particles. A good agreement between experimental and numerical characterizations was obtained
Arditty, Stéphane. "Fabrication, stabilité et propriétés rhéologiques des émulsions stabilisées par des particules colloïdales." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2004. http://tel.archives-ouvertes.fr/tel-00135898.
Full textAndersson, Egerlid Axel, and Fredrik Westin. "Design of filter cloth analyser : Development of a portable filter cloth selection tool for filters used to regenerate the acid used in the pickling process during the production of stainless steel." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-71474.
Full textStålindustrin är en industri som tillverkar ettav de mest använda materialen i världen. Trotsindustrins enorma storlek är det kanske intemånga som reflekterar varifrån stålet kommerifrån när man köper exempelvis IKEA bestick.Men faktum är att den här industrin är mycketmer invecklad och komplex än vad man kan tro. Under tillverkningsprocessen går stålet ige-nom flera processer. En av de här processerna genomförs genom att behandla stålet med starksyra. Den kemiska processen kallas för betningoch är det som ger en produkt tillverkad i stålden karaktäristiska lena och glänsande ytan. Den här examensrapporten handlar om ut-vecklandet av en test enhet som effektivt kan testa filter dukarna till ASRA (Acid SludgeRemoval Apparatus) systemet. ASRA systemetär ett filtreringssystem utvecklat av Scanaconi Stockholm som filtrerar och renar syran som används under betningsprocessen vid stål-tillverkning. Idag är det komplicerat, tidskrä-vande och farligt att testa och utvärdera olika filterdukar för att ta reda på vilken duk somger bäst resultat, eftersom att testerna måstegenomföras på de riktiga systemen. Målet fördet här examensarbetet var därför att lösa dehär problemen. Scanacon ville ha en alternativlösning som inte kräver interaktion med deriktiga systemen. De ville också ha en portabeloch säker lösning. För att lösa problemet utvecklades en itera-tiv designprocess kallad RDCD som står för research, design, create & delivery. Processen var tungt influerat av CDIO (Conceive, De-sign, Implement & Operate) processen. Efter att researchfasen var genomförd bestämdesdet att en liten filteranalysatorprodukt var detbästa sättet att lösa problemet på. Produktenutvecklades sedan en komponent i taget. Underprojektets gång har flera prototyper byggts och flera tester genomförts för att validera designen. Resultatet är en liten filtreringsenhet som är specialdesignad för att simulera ASRA syste-met. Produkten kan snabbt testa oliak filterdu-kar på ett enkelt sätt, utan utsätta användaren för fara. Efter att testerna genomförts kananvändaren identifiera vilken duk som funkatbäst. Produkten är tillräckligt liten för att fåplats i en hårdplast väska, vilket ger produktenden efterfrågade portabiliteten.
Perrier-Cornet, Romain. "Précipitation de particules polymères réticulées : applications comme supports fonctionnels et propriétés interfaciales." Bordeaux 1, 2008. http://www.theses.fr/2008BOR13603.
Full textZgheib, Nancy. "Élaboration de particules de latex composites à base d'oxyde de cérium par polymérisation radicalaire en milieu aqueux dispersé." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00862401.
Full textHeyse, Anja [Verfasser], Anja [Akademischer Betreuer] Drews, Matthias [Gutachter] Kraume, Anja [Gutachter] Drews, and Antje [Gutachter] Spieß. "Filterability and rheological behavior of lipase containing water-in-oil Pickering emulsions stabilized with silica particles for the application in continuous biphasic biocatalysis in a membrane reactor / Anja Heyse ; Gutachter: Matthias Kraume, Anja Drews, Antje Spieß ; Betreuer: Anja Drews." Berlin : Technische Universität Berlin, 2020. http://d-nb.info/1222588382/34.
Full textLo, Wan-Chen, and 羅婉珍. "Applying Particle Swarm Algorithm to the Batch Order Policies in Manual Picking System of Distribution Center." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/39064981093794019806.
Full text元智大學
工業工程與管理學系
97
The order picking is one of the important and complex operations in the distribution center. The order picking time accounts for 30%~40% of total operation time in distribution center. Hence, a well planned order picking strategy can reduce the operating cost of the distribution center effectively. In this study, the optimal order picking strategies were evaluated. We used two order batching methods (Random Batching and Least Aisle Batching) combined with two route planning methods (Traversal Strategy and Largest Gap Strategy) to determine the initial solutions. Then, we used Particle Swarm Optimization (PSO) to improve the initial solution and then tried to achieve the optimum solution. Finally, we utilized the MINITAB statistical software to test t the relationships among initial solutions, order picking strategies and the load limit of the picking cart. The results showed that the initial solutions had no statistical significance on the order picking distance. While order picking strategies and load limit had more influence on the order picking distance. We also found that the largest gap strategy had best performance in these simulation test problems.
王正安. "Applying Particle Swarm Optimization on Integrated Design of Order Batching and Route Planning in Order Picking Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/74488008533351809193.
Full textChen, Yi-ruei, and 陳奕叡. "Application of Particle Swarm Optimization Algorithm-Based Clustering Algorithm to Item Assignment in A Synchronized Zone Order Picking System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/07488192907611163085.
Full text國立臺灣科技大學
工業管理系
101
Order picking operation plays a very important role in warehousing. There have been some researches discussing how to save the picking time and reduce the idle time in picking operation. If two items appears in the same order simultaneously, then assigning them to two different picking zones can reduce the picking time for a synchronized zone order picking system. Thus, a simple way to measure the similarity between two items is to measure the co-appearance of two items in the same order. Therefore, this study attempts to apply genetic algorithm and particle swarm optimization algorithm to assign items to storage zones based on items’ similarities for shortening the picking time. Three different size problems are employed to testify algorithms’ performance. Computational results indicate that PSO algorithm outperforms GA and existing algorithm in terms of picking time.
Wüstner, Cornell. "Selbstorganisierte Strukturen mit Saturn-Partikeln." Doctoral thesis, 2014. https://monarch.qucosa.de/id/qucosa%3A20166.
Full textZhong, Ming-han, and 鍾明翰. "Preparation of ZnO Janus particles by Pickering emulsion." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/8s98q7.
Full text國立臺北科技大學
資源工程研究所
101
The aim of this study is the preparation of Janus particles by Pickering emulsion. The Janus particle contains silicon dioxide as a core layer and the zinc oxide as a shell layer. Comparing with traditional “Microfluidic methods” , Janus particles with uniform size can be prepared with this method. Since the silicon dioxide is hydrophilic, it is difficult to control the area of each sides of the Janus particles. By Pickering emulsion , it is possible to control the structure of Janus particle. In this study, we used cationic surfactant DDAB to modify the silica surface. By this surface modification, one can control the contact angle between particles and wax phase. Then, we synthesize a ZnO shell structure on SiO2 core by liquid-phase precipitation method. After removing wax by THF, Janus particle with silicon dioxide as a core layer and the zinc oxide as a shell layer can be prepared.The Janus particles were characterized by SEM, EDS and XRD. Experiment results show that, increasing the amount of the absorbed , the particle became more hydrophobic. The W/O ratio has significant effect on the stability of emulsion suspension. Increasing the amount of the oil phase will destabilize emulsion suspension. The SEM imagine showed that the Janus particles consist of one side covered with ZnO nanoparticles while the other side of particle was silica. The XRD and EDS imagine also show that the ZnO is of crystalline structure. Comparing with traditional method, this study demonstrated that Janus particles with controllable morphology can be prepared.
Su, JIA-HONG, and 蘇家弘. "Preparation of PS/SiO2/CNTs Composite Particles by Pickering Emulsion Polymerization." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/m9hpwm.
Full text南臺科技大學
化學工程與材枓工程系
105
PS/SiO2, PS/CNTs, PS/SiO2/CNTs composte microspheres were prepared by Pickering emulsion polymerization in the present paper.The effects of addition of CNTs and SiO2 on the particle size , conductivity and Zate potential.The results of microscope and DLS dynamic analysis,The SiO2 inorganic nanoparticles were coated on the surface of composite microspheres . The microstructures of PS/CNTs-COOH composite microspheres prepared by CNTs-COOH were observed by SEM,The surface of the microspheres was uniformly coated with CNTs, and the conductivity was increased with the addition of carbon nanotubes The amount increased from 7.1x10-3 S/cm to 9.4x10-2 S/cm. Addition of SiO2 and CNTs-COOH prepared PS/SiO2/CNTs composite microspheres, TEM and SEM analysis be observed on the surface with SiO2, CNTs, the conductivity of the composite particles with the outer layer of carbon tube increases, 9.2x10-4 S/cm up to 8.1x10-3 S/cm. Finally hollow SiO2/CNTs composite particles can be prepared by removing PS/SiO2/CNTs polymer by sintering or solvent extraction.
Mejia, Mejia Andres Fernando Fernando. "Discotic Colloids." Thesis, 2013. http://hdl.handle.net/1969.1/151142.
Full text"Ionic Liquid/Water/Particle Systems: Fundamentals Through Experiment, Application and Simulation." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.40797.
Full textDissertation/Thesis
Doctoral Dissertation Chemical Engineering 2016
"Polymer-Gold Composite Particles: Synthesis, Characterization, Application, and Beyond." Doctoral diss., 2015. http://hdl.handle.net/2286/R.I.34771.
Full textDissertation/Thesis
Doctoral Dissertation Chemical Engineering 2015
Wu, Hongda. "Developing an integrated system for automated picking and sorting using an ABB flexpicker robot : a thesis presented in partial fulfillment of the requirements of the degree of Master of Engineering in Mechatronics at Massey University, Auckland, New Zealand." 2010. http://hdl.handle.net/10179/1684.
Full textIn the rapid development of flexible automation and the broad application of computer technology, industrial monitor software has played an integral role in all kinds of industrial areas. It allows operators to monitor and control a plant in real-time with feedback from any number of processes. Traditionally industrial monitor software exhibits low efficiency, lack of reliability, non-reconfigurable and does not support multi-communication protocols, as is required for the exchange of data from outside of the factory. (Fan, 2006) Configuration software is basically type of the industrial automation and process monitor and control application. It supports Human Machine Interface (HMI), Supervisory Control and Data Acquisition (SCADA) system, realizes interlink between low level device and upper management network. Nowadays, with the advent of Configuration Software, engineers can readily construct field control systems with minimal developmental time and cost while allowing the combination of a plethora of user requests and control. The primary objective of this thesis is to develop a web base application with surveillance ability to realize remote control of an ABB IRB 340 Flexpicker robot through Siemens Programmable Logic Controller (PLC) system. The communication between the application and robot system is to be built using configuration software to link a number of third party devices through the inclusion of OLE for Process Control (OPC) techniques, graphical design editors, web navigators, and tag management. The thesis also introduces a vision system with trig-board design for object recognition and tracking.