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Teses / dissertações sobre o tema "Colloids"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Keal, Louis. "Dynamics of hard and soft colloids at aqueous interfaces." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066361/document.

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Dans cette these nous avons étudié la dynamique de colloides aux interfaces fluides. Dans une première partie nous avons étudié la dynamique de drainage de films minces liquides contenant des particules de microgels de PNiPAM. Ces systèmes sont de plus en plus utilisés pour stabiliser et déstabiliser des émulsions sur demande en jouant sur la température. Nous avons montré que la dynamique de drainage et l'épaisseur des films dépend de la concentration et du degré de réticulation des particules. Nous avons pu à partir des épaisseurs des films remonter à la conformation des particules. Les micr

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2

Russell, Emily Ruth. "Structure and Properties of Charged Colloidal Systems." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11413.

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This dissertation explores the changes in structure of colloidal systems on the introduction of repulsive interactions. Colloidal gels are well understood when all particle interactions are attractive, but their structure is fundamentally changed when repulsive interactions compete with those attractive interactions, as in the case of a binary gel of oppositely charged particles. Similarly, colloidal crystals are well understood when interactions are approximately hard-sphere, but again, the structure and material properties change when a long-range repulsion is introduced, giving a colloida

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3

Keal, Louis. "Dynamics of hard and soft colloids at aqueous interfaces." Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066361.

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Dans cette these nous avons étudié la dynamique de colloides aux interfaces fluides. Dans une première partie nous avons étudié la dynamique de drainage de films minces liquides contenant des particules de microgels de PNiPAM. Ces systèmes sont de plus en plus utilisés pour stabiliser et déstabiliser des émulsions sur demande en jouant sur la température. Nous avons montré que la dynamique de drainage et l'épaisseur des films dépend de la concentration et du degré de réticulation des particules. Nous avons pu à partir des épaisseurs des films remonter à la conformation des particules. Les micr

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4

Ryan, Joseph Nolte. "Groundwater colloids in two Atlantic coastal plain aquifers : colloid formation and stability." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14560.

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5

Drube, Fabian. "Selfdiffusiophoretic Janus colloids." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-173348.

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6

Reynolds, Matthew Drake. "Colloids in groundwater." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15311.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.<br>Bibliography: leaves 94-97.<br>by Matthew Drake Reynolds.<br>M.S.

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7

Batista, Vera Mónica de Oliveira. "Deformable spherical colloids." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610066.

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8

Chu, Fangfang. "Dumbbell-shaped colloids." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2014. http://dx.doi.org/10.18452/17062.

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In der vorliegenden Arbeit wurde das Phasenverhalten von harten Hantelteilchen (Dumbbells) als Funktion des Aspektverhältnisses (L*, der Quotient aus dem Abstand der Massenzentren zum Durchmesser der Kugel) und der Volumendichte untersucht. Bragg-Reflexe weisen darauf hin, das harte Dumbbells mit L* < 0.4 einen Phasenübergang von einer Fluid-artigen Phase zu einem plastischen Kristall zeigen. Die experimentellen Phasendiagramme bei L* ~ 0.24 und L*~ 0.30 sind vergleichbar mit Vorhersagen aus Monte Carlo-Simulationen. Rheologie Messungen zeigen, dass harte Dumbbells verschiedene Gleichgewichts

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9

Shvets, Alexey. "Theory of colloidal stabilization by unattached polymers." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAE025/document.

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Les dispersions colloïdales ont beaucoup d’applications technologiques importantes. A cause du mouvement brownien, les particules ont des collisions fréquentes entre elles. Les forces d’attraction de van der Waals,dérivant de potentiels à longue portés, conduisent à l’agrégation et à la précipitation des particules. Plusieurs méthodes ont été proposées pour diminuer ou contrebalancer l’effet d’attraction de van der Waals et augmenter la stabilité colloïdale. Par exemple, le choix du solvant possédant l’indice de réfraction le plus proche possible de celui des particules peut diminuer les force

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10

Kemp, Roger. "Colloids in external fields." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508084.

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11

Clements, Andrew Franklin. "Photophysics of C60 Colloids." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/265338.

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The goal of this dissertation is to study the photophysics of suspensions of colloidal C₆₀ particles to determine if their nonlinear optical (NLO) response is superior in any way to benchmark NLO materials such as molecular solutions of C₆₀ and carbon black suspensions (CBS). C₆₀ in molecular form is known to exhibit strong reverse saturable absorption (RSA) and it is posited that colloidal particles composed of many C₆₀ molecules would maintain some degree of RSA behavior upon association, although some quenching is to be expected. CBS is known to have an NLO response that is dominated by n

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12

Quarcoo, Naa Larteokor. "Modeling polymer-colloid phase behavior." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 152 p, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1440615.

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13

Boniello, Giuseppe. "Mouvement brownien des particules colloïdales partiellement mouillées." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS068/document.

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La dynamique de particules colloïdales à l'interface entre deux fluides joue un rôle central dans la micro-rhéologie, l'encapsulation, l'émulsification, la formation de biofilms, la décontamination de l'eau. En outre, ce sujet est également stimulant d'un point de vue théorique en raison de la complexité de l'hydrodynamique à l'interface et du rôle de la ligne de contact. Malgré ce grand intérêt, le comportement d'une particule à une interface fluide n'a jamais été caractérisé directement. Dans cette thèse, nous étudions le mouvement brownien de billes micrométriques de silice et de sphéroïdes

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14

Pierce, Flint G. "Aggregation in colloids and aerosols." Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/348.

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15

Williams, Ian. "Colloids in optically defined confinement." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633436.

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Materials under spatial confinement are subject to volume exclusion conditions differing from those of a bulk material. On reducing a system to a lengthscale of the order of a few particles onc can observe new structures, modified dynamics and phase behaviour dramatically differing from that of the bulk system. Through understanding and controlling the boundaries confining a system one can alter the energy landscape it experiences. Three colloidal model systems are realised using holographic optical tweezers to investigate confinement phenomena in quasi two dimensions. ~Whereas the bulk of exi

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16

Köhler, Werner. "Hot colloids in polymer networks." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-179496.

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17

Bakewell, David John Guy. "Dielectrophoresis of colloids and polyelectrolytes." Thesis, University of Glasgow, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416521.

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18

Archer, Richard. "Catalytic self-phoretic active colloids." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19453/.

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Active Janus colloids are nano to micron sized colloids, capable of propelling themselves through fluidic environments. Localised, asymmetric catalytic reactions on the colloidal bodies are used to decompose a dissolved ‘fuel’ to produce motion. Active Janus colloids have been proposed for applications in microfluidic transport. Currently active Janus colloids are restricted in their practical applications due to the randomised nature of their trajectories over time and their low yielding production methods. This thesis is focused on active Janus colloids prepared by physical vapour deposition

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19

Pawsey, Anne Claire. "Colloids at liquid crystal interfaces." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8969.

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This thesis presents a study of colloidal particles dispersed in thermotropic liquid crystals. It has a specific focus on colloids in the presence of an interface between the liquid crystal and an isotropic fluid. Three systems are studied: colloids trapped at a planar interface between a cholesteric liquid crystal (CLC) and an isotropic oil, nematic emulsions with interfacial colloids and the influence of colloids on the phase transition kinetics of the cholesteric blue phase. Experiments are carried out using polarising optical and confocal microscopy. By combining these techniques, the dire

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20

Cohen, Jack Andrew. "Active colloids and polymer translocation." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:e8fd2e5d-f96f-4f75-8be8-fc506155aa0f.

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This thesis considers two areas of research in non-equilibrium soft matter at the mesoscale. In the first part we introduce active colloids in the context of active matter and focus on the particular case of phoretic colloids. The general theory of phoresis is presented along with an expression for the phoretic velocity of a colloid and its rotational diffusion in two and three dimensions. We introduce a model for thermally active colloids that absorb light and emit heat and propel through thermophoresis. Using this model we develop the equations of motion for their collective dynamics and con

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21

Theurkauff, Isaac. "Collective Behavior of active colloids." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10251/document.

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Nous étudions le comportement collectif d'une assemblée de colloïdes Janus, des sphères d'or de 1µm dont une moitié est recouverte de platine. Lorsqu'ils sont immergés dans une solution d'eau oxygénée, ils se déplacent à des vitesses de l'ordre de 5µm/s, contrôlable par la concentration en peroxyde. Individuellement, ces colloïdes suivent une marche aléatoire persistante ; Ils interagissent par effets phorétiques, formant des clusters dynamiques de quelques dizaines de colloïdes. Ces clusters, mobiles, échangent continuellement des colloïdes, se divisent et se fusionnent, formant une phase sta

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22

Smith, Gregory N. "Charging colloids in nonpolar solvents." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.683919.

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Stabilizing charged species in nonpolar solvents is difficult due to their low relative permittivity (Er); therefore, surfactants that form inverse micelles are often used as charge control additives (CCAs). In this Thesis, the structural and electrokinetic properties of surfactants and surfactant-charged colloids in nonpolar solvents were studied. The aggregation of surfactants was studied using high-resolution small-angle neutron scattering (SANS) measurements. Critical micelle concentrations (CMCs) for inverse micelle formation were measured for an anionic and a nonionic surfactant, and the

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23

Kim, Anthony Young. "Heteroaggregation of oppositely charged colloids /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/9834.

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24

Labalette, Vincent. "Structure and rheology of anisotropic colloids." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0068.

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Les argiles colloïdalles sont des phillosilicates d’hydrure de magnésium (ou d’aluminium) pouvant, de part des substitutions isomorphiques, acquérir une charge négative structurale compensée par la présence de cations au niveau de l’espace interfoliaire ou en surface même du colloïde. Ces nanoparticules ont une forme de palet avec un rapport de forme pouvant varier entre 20 et 100. Lors de leur mise en suspension, les colloïdes s’hydratent provoquant ainsi leur gonflement et le relargage des cations. Les groupements hydroxyles présents en bordure des argiles sont extrêmement dépendants du pH e

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25

Higginbotham, Catrena Pearl. "The characterization and manipulation of the internal pore structure of tetramethoxysilane sol-gels and polymer hybrid gels." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/30556.

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26

Shang, Jianying. "Surface thermodynamic properties of subsurface colloids." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Dissertations/Summer2008/J_Shang_072108.pdf.

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27

Neyland, Ryan P. "Colloid Detachment from Rough Surfaces in the Environment." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-050505-114151/.

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28

Ramakrishnan, Ramaa N. "Surface enhanced Raman spectroscopic studies of the orientation of organonitriles on metal colloids." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1583.

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Thesis (M.S.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains xi, 81 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references.

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29

Palacci, Jérémie. "Manipulation of Colloids by Osmotic Forces." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00597477.

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30

Sano, Masaki, Hong-ren Jiang, and Daiki Nishiguchi. "Self-organization dynamics of active colloids." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-179578.

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31

Robinson, Derek James. "Structure and dynamics of interfacial colloids." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334638.

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32

Chapman, John Richard. "Ultrasonic wave interactions with magnetic colloids." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366409.

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33

Irfachsyad, Danial. "Mesoscopic simulation of polymers and colloids." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252212.

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34

Hinds, Ian Charles. "Characterisation of colloids by electric birefringence." Thesis, London South Bank University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336307.

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35

Francis, Paul Anthony. "Production and stabilisation of copper colloids." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46299.

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36

Law, Clement. "Simulations of lock and key colloids." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675695.

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We introduce the concept of self-assembly and describe how it can explored with a system of colloids. We introduce the lock and key colloid, and describe how it can be useful probe for exploring a specific, geometry-centric, type of colloidal self-assembly called the depletion interaction. We illustrate some of the problems with simulating the lock and key colloid, and intro duce a novel simulation method to side-step many of these problems. Using this simulation technique, and derived theoretical thermodynamic apparatus, we show a methodology for parametrising the depletion drive self-assembl

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37

Golz, Paul Michael. "Dynamics of colloids in polymer solutions." Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/10922.

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The dynamics of a dilute suspension of colloids diffusing in a simple liquid are well understood and are characterised by the Stokes-Einstein equation. However the validity of this equation for describing the diffusion of a colloid through a polymer solution has been questioned. In this work the motion of dilute poly-methylmethacrylate spheres diffusing through a solution of flexible polystyrene polymers has been studied. Dynamic light scattering was used to measure the self-diffusion of the spheres and the diffusion coefficient for this motion was found to exhibit time dependence. At short ti

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38

Hussain, Shahid. "The electromagnetic properties of nanoparticle colloids." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1445659/.

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Electromagnetic applications have been at the forefront of technological advancements for many years. As demand for these grows, the need for materials possessing unique electromagnetic properties increases. The aim of this research is therefore to investigate the electromagnetic properties of the nanoparticle colloids in the frequency range of 1 MHz to 20 GHz, with focus on the electromagnetic absorption mechanisms at microwave frequencies. A broad range of magnetic and dielectric properties are investigated using novel, as well as conventional, theoretical and experimental techniques. A numb

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39

Hunt, Paul Edward. "Protective colloids : understanding nucleation and grafting." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/protective-colloids-understanding-nucleation-and-grafting(a5f5c8c9-acc7-492b-bf81-3cf327af98cf).html.

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Alkali-soluble resins (ASRs) were prepared by (i) solution and (ii) emulsion polymerization. All ASRs were synthesized with number-average molar masses < 20,000 g mol-1 and all had 15 wt% methacrylic acid 5 wt% styrene, the remaining 80 wt% was composed of either methyl methacrylate or a combination of methyl methacrylate and ethyl acrylate. All emulsion ASRs were made to 20% solids, with volume-average particle diameters (dv) in the region 30 – 50 nm, with a glass transition temperature of 80 – 120 °C. Emulsion polymerization was the preferred route for ASR synthesis, to allow further studies

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40

Sano, Masaki, Hong-ren Jiang, and Daiki Nishiguchi. "Self-organization dynamics of active colloids." Diffusion fundamentals 20 (2013) 17, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13541.

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41

Tu, Mei Hsien. "Physical characteristics of chemically propelled colloids." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4531/.

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Understanding the transport properties of microorganisms in fluid is a fundamental problem in soft matter physics, and the dynamics of an active colloid in non-equilibrium statistical mechanics has recently attracted pioneering investigations into the design of artificial swimming robots at the microscale. A topical review of the remarkable discoveries in the field, both theoretically and experimentally, is first addressed. The mechanism of interfacial phoretic transport is used for an active colloid achieving autonomous propulsion by diffusiophoresis. A theoretical framework has been establis

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42

Nidhi, Vagisha. "Radiotactic colloids : towards the Decontamination Nanobots." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF052.

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Les méthodes traditionnelles de décontamination restent confrontées à des défis importants, tels que la difficulté d'accès aux espaces complexes ou confinés, la quantité élevée de déchets, etc. Il est encore nécessaire aujourd'hui d'explorer de nouvelles méthodes permettant d'atteindre des géométries complexes avec des processus de décontamination efficaces. Même si les macrorobots se révèlent utiles dans les tâches de décontamination à grande échelle, leur taille limite leur capacité à naviguer dans des environnements complexes et confinés. Les micro ou nano robots, quant à eux, pourraient tr

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43

Yang, Zhimou. "Molecular hydrogels : design, synthesis, enzymatic regulation, and biological applications /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CHEM%202006%20YANG.

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44

Tan, Chai Geok. "Deposition of colloidal spheres under quiescent conditions." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26744.

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The phenomenon of deposition (or release) of fine particles or other microscopic species, suspended in a liquid, onto (or from) a foreign substrate surface plays a critical role in many natural and industrial processes. Traditionally, the analysis of this phenomenon has been conceptually divided into two steps — the transport step and the adhesion step. Attempts to understand the role of the adhesion step on the overall deposition process under most practical situations are complicated by the presence of a large number of interdependent parameters such as double layer thickness, particle and w

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45

Lu, Yu. "Engineering the structures and shapes of colloidal particles /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10615.

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46

Dersoir, Benjamin. "La physique du colmatage : de la particule colloïdale au bouchon." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S010/document.

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La formation de bouchon est un problème récurrent et presque inévitable lors de l'écoulement de solutions diluées dans des milieux poreux. Actuellement, on ne sait pas comment, à partir du processus initial de déposition de particules à la paroi, ces dernières s'accumulent dans le pore et finissent par le boucher. L'idée générale de ce travail est d'étudier la dynamique de formation de bouchon lors l'écoulement de particules colloïdales au sein de matériaux poreux modèles (canaux microfluidiques). Nous décrivons dans un premier temps, les différents phénomènes physiques impliqués dans la captu

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47

Zimmermann, Urs [Verfasser]. "Colloids in Non-Equilibrium: Dynamical Density Functional Theory of Colloidal Suspensions under External Forcing / Urs Zimmermann." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2018. http://d-nb.info/1151698288/34.

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48

Ibrahim, Yahaya. "Phoretic self-propulsion of chemically active colloids." Thesis, University of Bristol, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.723473.

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49

Chowdhury, Zaid Kabir. "Coagulation of submicron colloids in water treatment." Diss., The University of Arizona, 1988. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1988_35_sip1_w.pdf&type=application/pdf.

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50

Chinas, Fernando. "The behaviour of colloids in lubricated contacts." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325565.

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