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Teses / dissertações sobre o tema "Hydrophobic"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Mancera, Ricardo Luis. "Understanding the hydrophobic effect." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627110.

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2

Pazhianur, Rajesh R. "Hydrophobic Forces in Flotation." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/28066.

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An atomic force microscope (AFM) has been used to conduct force measurements to better understand the role of hydrophobic forces in flotation. The force measurements were conducted between a flat mineral substrate and a hydrophobic glass sphere in aqueous solutions. It is assumed that the hydrophobic glass sphere may simulate the behavior of air bubbles during flotation. The results may provide information relevant to the bubble-particle interactions occurring during flotation. The glass sphere was hydrophobized by octadecyltrichlorosilane so that its water contact angle was 109 degrees. The m

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3

Cochin, D., P. Hendlinger, and André Laschewsky. "Polysoaps with fluorocarbon hydrophobic chains." Universität Potsdam, 1995. http://opus.kobv.de/ubp/volltexte/2008/1734/.

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A series of amphiphilic copolymers is prepared by copolymerization of choline methacrylate with 1,1,2,2-tetrahydroperfluorooctyl methacrylate in varying amounts. The copolymers bearing fluorocarbon chains are studied concerning their effects on viscosity, solubilization and surface activity in aqueous solution, exhibiting a general behavior characteristic for polysoaps. The results are compared with the ones obtained for an analogous series of amphiphilic copolymers bearing hydrocarbon chains.

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4

Quyum, Abdul. "Water migration through hydrophobic soils." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65008.pdf.

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5

Singh, Baljit. "Studies on hydrophobic dendrimer nanoparticles." Thesis, University College London (University of London), 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428133.

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6

Matthews, Andrew Ernest. "Synthesis of hydrophobic crosslinkable resins." Thesis, Kingston University, 1989. http://eprints.kingston.ac.uk/20528/.

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After reviewing the literature relating to the synthesis and properties of hydrophobic materials, and then considering potential methods for their synthesis, a route for the preparation of novel materials was chosen. A reaction scheme involving the condensation of an excess of 1,4-bis (chloromethyl) benzene with bisphenolic compounds, and conversion of the resultant chloromethyl products to their vinyl analogues is described. A variety of methods were used to accomplish the initial etherification. The use of dimethyl acetamide and potassium carbonate was found to reduce the incidence of side r

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7

Pan, Lei. "Hydrophobic Forces in Wetting Films." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/76918.

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Flotation is an important separation process used in the mining industry. The process is based on hydrophobizing a selected mineral using an appropriate surfactant, so that an air bubble can spontaneously adhere on the mineral surface. The bubble-particle adhesion is possible only when the thin film of water between the bubble and particle ruptures, just like when two colloidal particles or air bubbles adhere with each other. Under most flotation conditions, however, both the double-layer and dispersion forces are repulsive, which makes it difficult to model the rupture of the wetting films us

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8

Boyett, Robin Ernest. "Computational studies of hydrophobic porphyrins." Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241621.

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9

Yang, Fan 1980. "Solvent mediated interaction between hydrophobic spheres." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84087.

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We develop a coarse grained methodology to study solvent mediated interactions between two or more hydrophobic spheres. The free energy of a configuration of two hydrophobic hard spheres is calculated as a function of their separation to understand the thermodynamic force between them mediated by water. The range of the hydrophobic interaction is found to be of the order of the equilibrium correlation length of water; beyond this range the hydrophobicity induced force is negligible. We also examine the free energy landscape corresponding to the two interacting hydrophobic spheres, and f

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10

Lipnizki, Frank. "Hydrophobic pervaporation : process integration and optimisation." Thesis, University of Bath, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343775.

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11

Baines, Fiona Louise. "Water-soluble hydrophilic-hydrophobic block copolymers." Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283139.

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12

Baba, N. M. "Hydrophobic polymers and nanocomposites from cassava." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1435602/.

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This project aims to benefit the sub-Saharan African economies by exploiting cassava for chemical feedstock for materials production. It anticipates the industrial changes that will follow from increased petroleum price and regulatory control of embedded fossil carbon. It offers a way to integrate industrial and agricultural sectors. Initially, glucose and fructose were dehydrated by reactive distillation over a sulfated zirconia catalyst and 1-butyl-3-methylimidazolium chloride (BMIM Cl) ionic liquid as solvent under a nitrogen atmosphere at 180 oC to produce 5-(hydroxymethyl) furan (5-HMF) a

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13

Ghasemi, Mohsen. "Evaporation of Water in Hydrophobic Confinement." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1503094472074141.

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14

Wang, Jihang. "Modeling Hydrophobic Effects at different lengthscales." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/161.

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Understanding hydrophobic effects at different length scales is relevant to many complex and poorly understood everyday phenomena in materials science and biology. In this thesis, a variety of theory/computational methods in statistical physics and statistical mechanics are used to address three separated, but interconnected problems: (1) How solvation free energy scales with a partical size that is charged? This problem has never been attempted to solve before despite its immense importance in colloidal and protein solutions (J. Wang, D. Bratko, K. Leung and A. Luzar, Hydrophobic hydration at

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15

Gupta, Vipul. "Deposition and Characterization of Hydrophobic Coatings." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3859.

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Hydrophobic coatings find application in various sectors of the economy including to electronics, textiles, optical devices, and in scientific and commercial equipment. These different applications demand that different hydrophobic coatings posses a range of properties that may include smoothness or roughness, thicknesses on the order of a monolayer or a micron, robustness or the ability to dissolve quickly, transparency or opacity, water resistance or water permeability, electrical conductivity, oleophobicity, etc. However, whatever the final/desired properties, deposition via dry-deposition

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16

Piotto, Chiara. "Nanostructured materials for hydrophobic drug delivery." Doctoral thesis, Università degli studi di Trento, 2019. https://hdl.handle.net/11572/367644.

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Porous silicon (Psi) and nanocellulose (NC) hydrogels are nanostructured materials with several properties that make them promising for drug delivery applications. In this work, Î²-carotene (BC) and clofazimine (CFZ) are used as model molecules to investigate the physical and chemical processes governing the interactions of hydrophobic molecules with both inorganic (Psi) and organic (NC) nanostructured carriers. Despite the large number of advantages, Psi does not perform well as carrier for BC, since it stimulates the molecule degradation even if its surface is carefully passivated. Furtherm

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17

Piotto, Chiara. "Nanostructured materials for hydrophobic drug delivery." Doctoral thesis, University of Trento, 2019. http://eprints-phd.biblio.unitn.it/3575/2/Piotto_thesis.pdf.

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Porous silicon (Psi) and nanocellulose (NC) hydrogels are nanostructured materials with several properties that make them promising for drug delivery applications. In this work, β-carotene (BC) and clofazimine (CFZ) are used as model molecules to investigate the physical and chemical processes governing the interactions of hydrophobic molecules with both inorganic (Psi) and organic (NC) nanostructured carriers. Despite the large number of advantages, Psi does not perform well as carrier for BC, since it stimulates the molecule degradation even if its surface is carefully passivated. Furthermo

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18

Ermeydan, Mahmut Ali. "Wood cell wall modification with hydrophobic molecules." Phd thesis, Universität Potsdam, 2014. http://opus.kobv.de/ubp/volltexte/2014/7132/.

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Wood is used for many applications because of its excellent mechanical properties, relative abundance and as it is a renewable resource. However, its wider utilization as an engineering material is limited because it swells and shrinks upon moisture changes and is susceptible to degradation by microorganisms and/or insects. Chemical modifications of wood have been shown to improve dimensional stability, water repellence and/or durability, thus increasing potential service-life of wood materials. However current treatments are limited because it is difficult to introduce and fix such modificati

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19

Etmimi, Hussein Mohamed. "Hydrophobic core/shell particles via miniemulsion polymerization." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019/539.

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20

Chen, C. H. "Phase ordering of monoglyceride in hydrophobic solutions." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597547.

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In Chapter 1 the fundamentals of MG and MG-water are reviewed before embarking on studying the mixtures of MG and oils. The typical phase ordering and crystallisation process are reviewed. Understanding the physical properties of lipids is fundamentally important, hence, relevant theories regarding the phase behaviour are discussed in the following section. Chapter 2 introduces synthesis, characterisation and experimental techniques used throughout the thesis. Particular attention is given to assess the limitations of these techniques when probing the phase ordering of MG-oil. In Chapter 3 th

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21

Moradi, Sona. "Super-hydrophobic nanopatterned interfaces : optimization and manufacturing." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46588.

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This work studies in detail the effect of femtosecond laser irradiation process parameters (fluence, scanning speed and scanning overlap) on the wettability of the resulted micro/nano-patterned morphologies on stainless steel. Depending on the laser parameters, four distinctly different nano-patterns were produced, namely nano-rippled, parabolic-pillared, elongated sinusoidal-pillared and triple roughness nanostructures. All of the produced structures were classified according to a newly defined parameter, the Laser Intensity Factor (LIF) that is a function of scanning speed and fluence of las

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22

Charalambous, Antonia. "Lipid oil nanodroplets for hydrophobic drug delivery." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/21956/.

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Delivery of anti-cancer drugs to tumours is a fundamental requirement for cancer treatment. However, failure of drugs to reach tumours at sufficient concentrations due to poor bioavailability, rapid metabolism and elimination compromises effective treatment. A substantial number of potent anti-cancer drugs, exhibit hydrophobic properties that hinder their clinical use. Therefore, there is an urgent need for the development of a hydrophobic drug delivery system (DDS) that aims to effectively deliver and controllably trigger the release of these agents. This may improve drug bioavailability, eff

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23

Crick, C. R. "The chemistry and CVD of hydrophobic surfaces." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1332890/.

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This thesis details the use of chemical vapour deposition (CVD) to deposit hydrophobic surfaces, in addition to this, the functional properties are investigated and further characterisation of the surfaces extreme water repulsion (superhydrophobicity) is made. The design and manufacture of surfaces that repel water (hydrophobic) draws much inspiration from the natural world, including examples of superhydrophobic leaves. The way water can interact with a surface is characterised, with many examples of superhydrophobic surface generation provided from the literature, along with general routes t

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24

Gan, Haiying. "Self-Assemblies Driven by the Hydrophobic Effect." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/1389.

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Water is a simple molecule but is an essential part of life. One key aspect of the properties of water is the hydrophobic effect, and whilst there is an appreciation of this phenomenon at the macro-scale (raindrops falling off leaves) and the micro-scale (the structure of cellular systems), a complete understanding at the molecular level still eludes science. Addressing this issue, our studies involve synthetic supramolecular compounds that assemble in water via the hydrophobic effect. First of all, a novel water-soluble deep-cavity cavitand was synthesized. It possesses four endo methyl gro

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25

Jones, Alan Wayne III. "Advancement of the Hydrophobic-Hydrophilic Separation Process." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89067.

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Froth flotation has long been regarded as the best available technology for ultrafine particles separation. However, froth flotation has extreme deficiencies for recovering ultrafine particles that are less than 30-50 μm in size for coal and 10-20 μm for minerals. Furthermore, dewatering of flotation products is difficult and costly using currently available technologies. Due to these problems, coal and mineral fines are either lost to tailings streams inadvertently or discarded purposely prior to flotation. In light of this, researchers at Virginia Tech have developed a process called hydroph

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26

Kroeger, Thomas William 1952. "Hydrophobic partitioning of the bacteriophage MS-2." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276963.

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In batch experiments at pH's 5 and 7, the partitioning of MS-2 between water and silica (unbonded) was compared with the partitioning between water and silica with 6.5 percent of the surface covered by hydrophobic C18 chains (bonded). The roles of double-layer and van der Waals forces in partitioning were explored by modeling the potential energies of interaction. MS-2 adsorption to unbonded silica was negligible at pH 7, but did occur at pH 5. Adsorption was independent of pH with the bonded silica and approximately 2.6 orders of magnitude greater than the unbonded at pH 5, suggesting the imp

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27

Cardin, Karl Jeffrey Theodore. "Jet Rebound from Hydrophobic Substrates in Microgravity." PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/4830.

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We experimentally investigate the phenomena of large jet rebound, a mode of fluid transfer following oblique jet impacts on hydrophobic substrates. We initially seek to describe the jet rebound regimes in tests conducted in the weightless environment of a drop tower. A parametric study reveals the dependence of the flow structure on the relevant dimensionless groups such as Reynolds number and Weber number defined on the velocity component perpendicular to the substrate. We show that significantly larger diameter jets behave similarly as much smaller jets demonstrated during previous terrestri

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28

Ronchi, Laura. "Synthesis of Hydrophobic Zeolites for Energetic Applications." Thesis, Mulhouse, 2017. http://www.theses.fr/2017MULH0678/document.

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Les zéolithes sont des solides microporeux cristallins largement utilisés en adsorption, catalyse, échange ionique et comme tamis moléculaires. Les zéolithes hydrophobes purement siliciques (zéosils) peuvent être utilisées pour le stockage et l’absorption de l’énergie mécanique par intrusion d’eau à haute pression. En fonction du système “zéosil-eau”, lorsque la pression est relâchée (extrusion), le système peut restituer, dissiper ou absorber l’énergie mécanique fournie pendant la compression (intrusion) et donc, il peut montrer un comportement de type ressort, amortisseur ou pare-chocs. Réce

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29

Macdonald, Ryan. "The Effects of Trimethylamine-N-Oxide and Guanidinium Chloride on Aqueous Hydrophobic Contact-Pair Interactions." Elsevier - Biophysical Chemistry, 2013. http://hdl.handle.net/1993/30162.

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Trimethylamine-N-oxide (TMAO) and guanidinium chloride (GdmCl) are both highly studied molecules in the field of protein folding/unfolding. Thermodynamic studies have shown that TMAO, an organic osmolyte, is a strong stabilizer of the protein folded state, while GdmCl is known to be one of the most effective protein denaturants. Although TMAO and GdmCl are well studied the mechanism by which they stabilize and denature proteins, respectively, is not well understood. In fact there are few studies looking at their effects on hydrophobic interactions. In this work we determine the effect of TMAO

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30

Darne, P. "Sophorolipid assisted enhanced solubility of hydrophobic biomolecules and development of nano-carriers as advanced drug delivery systems." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2018. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4587.

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31

Motornov, Mikhail. "Herstellung und Untersuchung schaltbarer Polymerschichten mit hydrophobem, hydrophilem Charakter (Fabrication and study of switchable polymerlayers with hydrophobic, hydrophilic behavior) /." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11513723.

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32

Coskuner, Orkide. "Investigation of hydrophobic interactions by Monte Carlo simulation." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968831664.

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33

To, Chi Shung Brian. "Protein retention and transport in hydrophobic interaction chromatography." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.12 Mb., 319 p, 2006. 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:3205434.

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34

Hawe, Andrea. "Studies on Stable Formulations for a Hydrophobic Cytokine." Diss., lmu, 2006. http://nbn-resolving.de/urn:nbn:de:bvb:19-59638.

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35

Spagnolo, David. "Low temperature oxidation of methanol using hydrophobic catalysts." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21640.pdf.

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36

Koziarz, Jacob. "Adhesion and immobilization of bacteria on hydrophobic cloths." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ36934.pdf.

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37

Yu, Zhimin. "Flocculation, hydrophobic agglomeration and filtration of ultrafine coal." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/NQ39010.pdf.

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38

Pomroy, Neil Christopher. "Solubilization of hydrophobic peptides by reversible cysteine PEGylation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0005/MQ45500.pdf.

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39

Al-Jamal, Khuloud Taysir Yousef. "Studies on cationic hydrophobic dendrons and hydrophilic dendrimers." Thesis, University College London (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414002.

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40

Lee, Jobina J. N. "Investigations into sustained-release hydrophobic matrix pellet formulations." Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275167.

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41

Tio, Evelyn. "Electrowetting study of jumping droplets on hydrophobic surfaces." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92210.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 27).<br>Recent studies have shown that jumping-droplet-enhanced condensation has higher heat transfer than state-of-the-art dropwise condensing surfaces by -30-40%. Jumping-droplet condensation occurs due to the conversion of surface energy to kinetic energy during the coalescence of microscale droplets, resulting in droplet ejection from the condenser surface. This conversion of energy is fundamentally studied by

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42

Agarwal, Abhinandan. "An experimental study of nanobubbles on hydrophobic surfaces." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34104.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.<br>Includes bibliographical references (p. 123-127).<br>With the recent development of microfluidic systems, miniaturization of flow devices has become a real challenge. Microchannels, however, are characterized by a large surface area-to-volume ratio so that surface properties strongly affect flow resistance in sub-micrometer devices. Recent studies in the literature have opened up the possibility of a controlled realization of nanobubbles- found to exist primarily on hydrophobic surfaces- that can pl

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43

Damak, Maher Ph D. Massachusetts Institute of Technology. "Droplet deposition on hydrophobic surfaces for agricultural sprays." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101814.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 51-55).<br>This thesis presents a study of the in-situ precipitation of polyelectrolytes during droplet impacts and its applications in enhancing the retention efficiency of sprays. Large amounts of agricultural sprays are wasted worldwide, due to the poor retention on hydrophobic plants. As the harmful effects of pesticides in particular are more and more pointed out, there is an increasing pressure to reduce th

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44

Lim, Wendel Alan. "The role of hydrophobic core in protein folding." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13897.

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45

Prendergast, Daniel P. (Daniel Patrick). "Optimization of hydrophobic meshes for oil spill recovery." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82848.

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Thesis (S.M.)--Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Widespread use of petrochemicals often leads to accidental releases in aquatic environments, occasionally with disastrous results. Recent advances in the understanding of selectively wetting surfaces have led to the development of functionalized steel meshes with hydrophobic and oleophilic surfaces. These meshes can perform oil/water separation in situ, continuously, via capillary action. The goal of t

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46

Chao, Michelle (Michelle L. ). "Hydrophobic nanostructured glass surfaces using metal dewetting process." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111342.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 18).<br>This project aims to create a hydrophobic surface through a top down fabrication process of a nanostructure surface on a glass surface. The nanostructure is created through reactive ion etching utilizing silver as a mask. The silver mask is the result of a solid state thermal dewetting process which is controlled by varying the temperature and time of the process. Using this fabrication process,

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47

Hu, Xiao Wen. "Hydrophobic interactions and liquid crystallisation in collagen assembly." Thesis, University of Winchester, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.697554.

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48

Smith, Kara E. "Cleaning and Dewatering Fine Coal using Hydrophobic Displacement." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/33416.

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A new processing technique, known as hydrophobic displacement, was explored as a means of simultaneously removing both mineral matter and surface moisture from coal in a single process. Previous thermodynamic analysis suggests that coal moisture will be spontaneously displaced by any oil with a contact angle greater than ninety degrees in water. Based on these results, six methods of hydrophobic displacement were evaluated: hand shaking, screening, air classification, centrifugation, filtration, and displacement. In the first five methods hydrophobic displacement took place during the clean

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49

Mastropietro, Dean J. "Interfacial Phenomena and Surface Forces of Hydrophobic Solids." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/48966.

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At the molecular level the entropic “hydrophobic effect” is responsible for high interfacial energies between hydrophobic solids and aqueous liquids, the low solubility of apolar solutes in aqueous solvents, and self-assembly in biological processes, such as vesicle formation and protein folding. Although it is known that a strong attraction between apolar molecules exists at the molecular level, it is not clear how this force scales up to objects with dimensions in the range 100 nm–1 m. This work sets out to measure the forces between particles with a radius of about 10 µm. Because we can onl

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50

Wang, Xueyuan. "Control and Characterization of Textured, Hydrophobic Ionomer Surfaces." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1341290657.

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