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Showing 1 to 20 of 30 for “"hydrophobic-hydrophilic"”.
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Advancement of the Hydrophobic-Hydrophilic Separation Process
… at Virginia Tech have developed a process called hydrophobic-hydrophilic separation (HHS), which is based originally on a concept known as dewatering by displacement (DbD). The process uses non-polar solvents (usually short-chain alkanes) to selectively displace water from particle surfaces and to …
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Hydrophobic-Hydrophilic Separation Process for the Recovery of Ultrafine Particles
… froth flotation. A novel technology called the Hydrophobic-Hydrophilic Separation (HHS) process, developed at Virginia Tech, has been successfully applied to recover fine coal in previous research. The results of research into the HHS process showed that the process has no lower particle size …
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Fabrication and Study of Switchable Polymer Layers with Hydrophobic/Hydrophilic Behavior
… switchable in controlled environment from ultra-hydrophobic to hydrophilic energetic states. The PFS/PVP mixed brush was grafted onto the pre-treated PTFE surface (plasma etching) with the needle like topography. The size of vertical needles was at micron scale. If the brush is switched to the …
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Fabrication, characterization, and wettability analysis of a microstructured hybrid hydrophobic/hydrophilic surface
… Surfaces are composed of many micropillars with hydrophobic sidewalls and hydrophilic tops. The surfaces are designed with stable dropwise condensation in mind, which can increase heat fluxes by an order of magnitude over those of filmwise condensation. Based on the literature and technical …
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Synthesis and Characterization of Hydrophobic-Hydrophilic Multiblock Copolymers for Proton Exchange Membrane Applications
… at low hydration levels. Nanophase separated hydrophilic-hydrophobic block copolymer ionomers are believed to be desirable for this purpose Three series of hydrophobic/hydrophillic, partially fluorinated/sulfonated multiblock copolymers were synthesized and characterized in this thesis. The …
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Processing of Low Rank Coal and Ultrafine Particle Processing by Hydrophobic-Hydrophilic Separation (HHS)
… mineral particles and low rank coal using the hydrophobic--hydrophilic separation (HHS) method. Several explorative experimental tests have been carried out to study the effect of the various physical and chemical parameters on the HHS process. In this study, the HHS process has been employed …
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The Production of Low Ash Coals Using the Hydrophobic-Hydrophilic Separation Process with Novel Developments
… mineral processing to separate material based on hydrophobicity. This process becomes less efficient, however, as particle size is reduced. Because of this ultrafine particles are often discarded prior to froth flotation, and contributes to a substantial amount of coal waste in impoundments. An …
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Synthesis and Characterization of Hydrophobic-Hydrophilic Segmented and Multiblock Copolymers for Proton Exchange Membrane and Reverse Osmosis Applications
… of disulfonated poly(arylene ether sulfone) hydrophilic-hydrophobic segmented and multiblock copolymers for application as proton exchange membranes (PEMs) in fuel cells or as reverse osmosis (RO) membranes for water desalination. The first objective was to demonstrate that synthesizing …
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Development and Testing of a Mobile Pilot Plant for the Advancement and Scale-up of the Hydrophobic-Hydrophilic Separation Process
… and dewater these materials are prohibitive. The Hydrophilic Hydrophobic Process (HHS) is one alternative to flotation that uses a recyclable solvent, rather than air bubbles, to selectively recover fine hydrophobic particles. Prior laboratory, proof-of-concept, and demonstration-scale testing has …
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Synthesis and Characterization of Hydrophobic-Hydrophilic Multiblock Copolymers for Proton Exchange Membrane and Segmented Copolymer Precursors for Reverse Osmosis Applications
… under partially RH conditions is to synthesize hydrophobic-hydrophilic multiblock copolymers with high Ion exchange capacity (IEC) values to ensure sufficient ion channel size. In this thesis two multiblock systems were synthesized incorporating trisulfonated hydrophilic oligomers and were …
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DEVELOPMENT OF A NOVEL MATRIX ASSISTED LASER DESORPTION / IONIZATION (MALDI) BASED PEPTIDE QUANTITATION APPROACH
… Subsequent work also revealed that the peptide hydrophobic / hydrophilic properties influenced the applicability of the quantitation approach to mixtures of peptides. Specifically, the data revealed that peptides with differing hydrophobic / hydrophilic properties appear to co-crystallize with …
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Release, Stability and Functionality of Nanodelivered Hydrophobic (Lutein and Beta-Carotene) and Hydrophilic (Folic Acid) Antioxidants Using Zein Nanoparticles
… to synthesize zein nanoparticles loaded with hydrophobic/hydrophilic antioxidants, and to study the release profiles and physical stability of nanocarriers and chemical stability of entrapped bioactives under on-shelf and GI conditions. The results supported the potential of zein nanoparticles …
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Developing a Novel Ultrafine Coal Dewatering Process
… but has remained a great challenge. The hydrophobic-hydrophilic separation (HHS) method is a powerful technology to address this problem. However, organic solvents in solvent-coal slurries produced during HHS must be recovered for the method to be economically viable. Here, the …
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Characterization and treatment of organic matter, UV quenching substances, and organic nitrogen in landfill leachates
… to humic acid (HA), fulvic acid (FA), and hydrophilic (Hpi) components before being subjected to size fractionation to determine UV254 absorbance and organic fractions. Particle size and hydrophobic-hydrophilic fractionation were conducted in series to evaluate the potential for membrane …
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Etude de la flottabilité de la malachite à l'aide de l'amylxanthate de potassium et d'un acide gras. (Cas d'étude: Flottation du minerai oxydé de Kamfundwa au Katanga en RDC)
… chemical study outlining the balance between hydrophobic/hydrophilic adsorbed species. The characterization of pure malachite mineral was done according to the following threefold approach: Chemical- Energetical -Electrochemical. The results obtained which are in agreement with studies …
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Hypercoiling and hydrophobically associating polymers : interfacial synthesis, surface properties and pharmaceutical applications
… a range of biodegradable hypercoiling or hydrophobically associating polymers to mimic natural apoproteins, such as those found in lung surfactant or plasma apolipoproteins. Stirred interfacial polymerization was used to synthesize potentially biodegradable aromatic polyamides (Mw of …
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Chemistry at liquid-liquid interfaces: con- and counter-current extraction and biologically active membranes in microchannels
… the microchannel. It is also found that these hydrophobic/hydrophilic interfaces allow for stable interfaces between immiscible fluids. Chemistry can be conducted at these interfaces. Reversed-micelle extraction of metal ions is studied. Traditionally, fluid flow of immiscible liquids is not …
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WETTING TRANSITIONS AT NANOSTRUCTURED SURFACES
… picture, when nanoscale droplets sit above hydrophilic patches on a heterogeneous surface, at certain conditions they can maintain a stable volume, determined by the pertinent contact angle and the size of the patches. Only the region under the droplet perimeter controls the contact angle, …
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The Influence of Aromatic Disulfonated Random and Block Copolymers' Molecular Weight, Composition,and Microstructure on the Properties of Proton Exchange Membranes for Fuel Cells
… morphology and higher hydration levels. A new hydrophobic-hydrophilic multiblock copolymer has been successfully synthesized based on the careful coupling of a fluorine terminated poly(arylene ether ketone) (6FK) hydrophobic oligomer and a phenoxide terminated disulfonated poly(arylene ether …
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Development of Polymer-Biomolecule Core-Shell Particles For Biomedical Applications
… is mainly governed by hydrogen bonding and the hydrophobic/hydrophilic interactions. This in turn helps retaining proteins' folding conformation and functionality, which are also demonstrated in the in vitro/in vivo cellular uptake of the PPCS-NPs in endothelial cells. </p> <p> The last part of …
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