Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 54 for “"hydrophobic surface"”.
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How Water Meets a Hydrophobic Surface: Reluctantly and With Flucuations
… of the static and dynamic properties of the hydrophobic/water interface on variables such as temperature, contact angle, pH, dissolved gasses, and sample quality, among others, in a hope to discover the root of the controversy in the literature. We found that the depletion layer is highly …
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How water meets a hydrophobic surface: reluctantly and with fluctuations
By definition hydrophobic substances hate water. Water placed on a hydrophobic surface will form a drop in order to minimize its contact area. What happens when water is forced into contact with a hydrophobic surface? One theory is that an ultra-thin low-density region forms near the surface. This …
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A pH Switchable Responsive Surface for the Trapping And Release of a Hydrophobic Substance
… to trap and release compounds in a solution. A hydrophobic substance will stick efficiently to a hydrophobic surface (the “like dissolves like” principle). With an introduced response (i.e. pH change), a responsive surface can change from hydrophobic to hydrophilic, weakening the hydrophobic …
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Hydrophobic nanostructured glass surfaces using metal dewetting process
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 …
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Influence of wettability on boiling heat transfer and critical heat flux in vertical flow boiling
… in commercial nuclear reactors may affect the surface wettability of fuel rods through the Radiation Induced Surface Activation (RISA) effect, and present power limits on nuclear reactors may be underestimated. Recent studies have focused on the influence of surface wettability on the departure …
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Force microscopy of self-assembled amphiphilic films
… microscopy is a powerful technique to study surfaces in vacuum, air or liquids because of its nanometer spatial resolution and piconewton force resolution. The work presented here uses colloidal (steric and double layer) forces to investigate the shape of surfactant micelles on an isotropic …
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Synthesis of functionalized polyamide 6 by anionic ring-opening polymerization
… more stable fluorinated polyamide 6 having a hydrophobic surface; (ii) the synthesis of polyamides 6 bearing pendant cinnamoyl groups, which are thermo- and photoresponsivechromophore groups, and demonstrating their reversible crosslinking as well as improved thermo-mechanical properties; …
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Design & Fabrication of Super-Hydrophobic Surfaces by Laser Micro/Nanoprocessing
Super-hydrophobic surfaces exhibit the property of high water repellence. In nature, lotus leaf and other plants have super-hydrophobic surfaces with self-cleaning effect. Taking inspiration from the surface properties of the lotus leaves, the ways to design and fabricate artificial …
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Surface Forces in Thin Liquid Films
… as in colloid films between two macroscopic surfaces and foam films between two air bubbles; and between two dissimilar phases, as in wetting films. Stability of the colloids, foams, and wetting films is determined by the surface forces in the TLFs. Depending on the nature of the surfaces …
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Experimental studies of liquid marbles and superhydrophobic surfaces
The interaction of water droplets with hydrophobic or rough, superhydrophobic solid surfaces has been studied. Such surfaces may be found in the natural world and their potential applications range from waterproof and self-cleaning surfaces to droplet microfluidics. A measure of hydrophobicity is …
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Admicellar Polymerization to Compatibilize Calcium Carbonate With Oil-Based Drilling Mud
… mud (OBM), a more preferred drilling mud, being hydrophobic is particularly non-compatible with hydrophilic CC. This work explored an economically viable admicellar polymerization technique to surface-modify the high energy hydrophilic CC surface to a low energy hydrophobic surface by …
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Mediated Patterning of Sol -Gel Thin Layers: Shrinkage, Decohesion, and Lift-Off
… the fracture strength of silicon. In this work, hydrophobic surface regions, facilitated by directed mu-CP of a molecular film, affected adhesion so as to reduce the substrate constraint and promote de-cohesion of the sol-gel film on the sub-micron scale. That is, selective de-cohesion and …
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Droplet deposition on hydrophobic surfaces for agricultural sprays
… 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 their use and make their spraying more efficient. Current solutions, mainly based on surfactants, all …
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Hierarchical superhydrophobic aluminum surfaces for condensation applications
… condensation is the implementation of superhydrophobic structures and chemistries on condensing surfaces. Aluminum, being a heavily utilized material in many condensing systems and other industrial applications, is the subject of the present study. This thesis presents methods for …
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Regulation of p190RhoGEF by Activated Rho and Rac GTPases: Amplification and Crosstalk
… Rac1 or RhoA with the PH domain utilize the same hydrophobic surface on the PH domain. Similar to RhoA, activated Rac1 interacts with the PH domain via its effector-binding surface albeit burying less surface area than the interaction of RhoA with the PH domain. Consequently, the PH domain of …
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Crystallographic and Modeling Studies Suggest that the SKICH Domains from Different Protein Families Share a Common Ig-like Fold but harbor substantial Structural Variations
… clusters are linked together by more generic hydrophobic interactions, forming a unique hydrophobic surface at one end of the TAX1BP1 SKICH domain. The structures and homologous models of SKICH domains from different proteins reveal substantial differences in electrostatic surface properties …
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Molecular cloning, peptide synthesis and bioactive assessment of a skin defensive peptide, QUB-2658 from the skin secretion of <i>Limnonectes fujianensis</i>
… can try to change specific residues to produce a hydrophobic surface in QUB-2658 with the aim to improve the amphiphilic property of the peptide and maybe its antibacterial activity.
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Carbon Nanotubes for the Stabilization of Lipid Nanostructured Particles
… amphiphilic due to hydrophilic head-group and hydrophobic alkyl chain/s. Lipids are known to self-assemble into remarkable nanostructures in the aqueous medium. In order to enhance their applicability, these nanostructures are further stabilised into nanoparticles using various stabilisers; …
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Effect of Surface Chemistry and Young's Modulus on the Surface Motility of the Bacterium Pseudomonas Aeruginosa
This study demonstrates that the surface motility of the bacterium Pseudomonas aeruginosa is dependent on the surface chemistry of the underlying substrate. In particular, cells on hydrophobic polydimethylsiloxane (PDMS) have a speed that is on average 38% greater than on hydrophilic PDMS. These …
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