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 50 for “"water contact angle"”.
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Epithelial Cell Adhesion and Proliferation on Titanium(V) Biofunctionalized with Nanoceramic Thin Film
… Surface wettability was evaluated via measuring water contact angle (n=5). Telomerase-immortalized human gingival keratinocytes (TIGKs) were cultured on each treated or untreated disk. Cell viability and adhesion were assessed at 6 and 24 hours via fluorescence microscopy (n=7), and proliferation …
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Effect of operating parameter on membrane distillation performance using kapok fibre for humic acid treatment
… that in finding solution to the problem of fresh water scarcity and its high demand. Membrane distillation have been shown to be an effective alternative to replace conventional technologies which found uneconomical. As agricultural waste is abundantly available, kapok fibre has been chosen an …
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Creating long-range hydrophobic forces by coadsorption of ionic and neutral surfactants
… the mica surfaces do not jump into contact with each other, suggesting that the phase-separated amine renders the surface hydrophilic. Furthermore, the force measurements conducted at pH 10.1 show repulsive steric forces, which become stronger with increasing DAHClI concentration. …
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Synthetic polymer-collagen composite hydrogel for drug delivery and tissue engineering
… the extent of successful crosslinking. Water contact angle and cell cytotoxicity study were also conducted to examine the biocompatibility of this material.
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Design, fabrication and testing of an acoustic resonator-based biosensor for the detection of cancer biomarkers
… of the surface chemistry is fully assessed using water contact angle, atomic force microscopy and confocal laser scanning microscopy. Functionalized biosensors are then used to quantify the concentration of known proteins marker in both a purified medium and a physiologically-relevant medium.
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Development of three-dimensional (3D) grayscale Photolithography process for microfluidic curvature Structures
… its wettability into superhydrophobic state with water contact angle 157.3 °. Various shapes and designs of micromixers, including the different height of obstacles inside the microchannel have been fabricated and achieve a good mixing performance. In sum, a 3D microfabrication by grayscale …
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Developing force field parameters for water interacting with graphene and graphene-like materials
Confined water can have properties dramatically different from bulk water, and these properties can be used to develop unique functionality at the nanoscale. For example, fast water transport, rotation-translation coupling, and fast rotationalmotion have been observed in graphitic carbon-based nano …
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Methods of Improving Oil Agglomeration
… suggests that oil can spontaneously displace water from coal's surface if the coal particle has a water contact angle greater than 90°. However, the clean coal products obtained from laboratory-scale dewatering-by-displacement (DbD) test work assayed moistures substantially higher than …
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Synthesis of Sustainable Antibacterial Materials by Surface Functionalisation of NZ Flax (Phormium tenax) Fibres and Hemp (Cannabis sativa) Hurd
… X-ray photoelectron spectroscopy (XPS), water contact angle measurements and bioactivity tests of the surface functionalised PTF and HH confirmed that the diazonium method of surface functionalisation was the most efficient and promising method of chitosan-grafting onto PTF and HH …
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Synthesis and Characterization of Poly(siloxane imide) Block Copolymers and End-Functional Polyimides for Interphase Applications
… solutions. The polymeric salts formed stable water solutions (or dispersions) and imidized in less than 10 minutes at 260°C. The water solubility and rapid imidization times are ideal for on-line processing. Thus, these materials can be used as sizing and interface toughening agents for fiber …
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Preparation and Characterization of Hydrophobic Graphene-Based Thin Films
… addition of a roughened surface topography the water contact angle can be improved by up to 45°.
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Biodiesel Production and Purification with a Hydrophobic Sintered Glass Filter
… glass filters were evaluated, such as the water contact angle, water sliding angle, solvent flux, and the breakthrough pressure. These characterizations revealed that the highest breakthrough pressure was achieved when the OTS had been applied onto the filters by means of a toluene coating …
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Study on the effect of zeolite rice husk particles on polysulfone membrane
… strength, atomic force microscope (AFM) and water contact angle (CA). The X-ray diffraction (XRD) analysis confirmed the transformation of RHA into zeolite type Y supported with Field Emission Scanning electron microscopy (FESEM) image and Energy dispersive X-ray spectroscopy (EDX). The EDX …
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Direct Force Measurement between Surfaces Coated with Hydrophobic Polymers in Aqueous Solutions and the Separation of Mixed Plastics by Flotation
… each other by flotation has been explored. While water contact angle is the most widely used measure of the hydrophobicity of a solid, it does not give the information on the kinetics of flotation. Therefore, the forces acting between the surfaces coated with different hydrophobic polymers (or …
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Attachment of bacteria to teflon and buna-n-rubber gasket materials
… were present on the surface of buna-N-rubber. Water contact angle measurements indicated that buna-N-rubber was a more hydrophobic surface than teflon. Qualitative analysis of the attachment of Pseudomonas fragi A TCC 4973, Listeria monocytogenes Scott A and Bacillus cereus ATCC 11778 to …
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MoS2 on Gold: achieving extremely high exfoliation yield and optical contrast for Van der Waals monolayers
… once the Au surface is exposed to air. Using water contact angle (WCA) measurements, the effect this contamination has on the surface adhesive energy was investigated. The WCA investigation is used to compare the effect of roughness and surface contamination on the resulting observed coverage …
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Self-assembled thin polymer film used for sensing application
… tail formed on AlGaN/GaN surface. According to water contact angle and UV/Vis absorption spectroscopy data, the stability of this self assembled monolayer on oxidized AlGaN/ GaN surface can be improved by photopolymerization of SAMs. The photopolymerization efficiency of the SAMs is effected by …
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A study on wettability properties of rutile-phase TiO2 nanostructure film
… by mixing hydrochloric acid (HCl), deionised water (DI) and titanium (IV) butoxide (TBOT). The effects of the duration of the hydrothermal process, the volume of HCl, the volume of TBOT as well as the use of surfactant hexadecyltrimethylammonium bromide (HTAB) toward the synthesis growth of …
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Study on the performance enhancement of biomedical implants: in vitro test under UV irradiation of titanium anodised in mixed electrolyte
… (FT-IR); and the hydrophilicity using water contact angle (WCA). TiO2 was then subjected in vitro testing to assess the bioactivity of TiO2 surface; that is the apatite formation ability. The apatite formation of the TiO2 coating was precipitated by using simulated body fluid (SBF) in …
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Nanotexturing for Biomedical Implants
… The objective of this research is to coat water-soluble hydrophilic fibers (poly (ethylene oxide)) (PEO)) with a hydrophobic polymer film (Arbomatrix©) to preserve the fiber texturing effect with future use as a slow controlled drug delivery coating. Arbomatrix (poly …
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