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Showing 1 to 20 of 23 for “"hydrophobic forces"”.
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Hydrophobic Forces in Flotation
… 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 …
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Hydrophobic Forces in Wetting Films
… however, both the double-layer and dispersion forces are repulsive, which makes it difficult to model the rupture of the wetting films using the DLVO theory. In the present work, we have measured the kinetics of film thinning between air bubble and flat surfaces of gold and silica. The former …
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Creating long-range hydrophobic forces by coadsorption of ionic and neutral surfactants
… force apparatus was used to measure surface forces between mica surfaces in dodecylamine hydrogen chloride (DAHCI) solutions at pH 5.7 in the presence and absence of long-chain alcohols. With DAHCI alone, only "short-range" hydrophobic forces were observed with decay lengths of 1.2-1.4 nm. In …
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Hydrophobic Forces in Free Thin Films of Water in the Presence and Absence of Surfactants
… different system were studied to investigate the forces interacting in thin liquid films. In the former, direct force measurements were conducted with bitumen-coated mica surfaces using a Mark IV surface force analyzer. Besides long-range electrostatic repulsive forces at separation distances …
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Effects of long-chain surfactants, short-chain alcohols and hydrolyzable cations on the Hydrophobic and Hydration Forces
… media can be predicted by the sum of two surface forces, i.e., the electrical double-layer and van der Waals forces. This theory, which was developed 50 years ago, served as a backbone for colloid chemistry. However, various experiments conducted in recent years showed that it is applicable only …
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Surface Forces in Thin Liquid Films of H-Bonding Liquids Confined between Hydrophobic Surfaces
Hydrophobic interaction plays an important role in biology, daily lives, and a variety of industrial processes such as flotation. While the mechanisms of hydrophobic interactions at molecular scale, as in self-assembly and micellization, is relatively well understood, the mechanisms of macroscopic …
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Surface Forces in Thin Liquid Films
… and wetting films is determined by the surface forces in the TLFs. Depending on the nature of the surfaces involved, the stabilities can be predicted using combinations of three different forces, i.e., the van der Waals, electrical double layer (EDL), and hydrophobic forces. The objective of the …
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Modeling bubble-particle interactions in flotation using hydrophobic solid surfaces
… microscope (AFM) was used to measure surface forces between a glass sphere and a flat fused silica plate under a number of conditions. Hydrophobic surfaces exhibiting contact angles ranging from 0 to 109° were prepared by reacting silica with octadecyltrichlorosilane (OTS). Contact angles, AFM …
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Peptide nanovesicles: supramolecular assembly of branched amphiphilic peptides
… (confirmed by TEM and DLS). Whereas weak hydrophobic forces drive and sustain lipid bilayer assemblies, these structures are further stabilized by β-sheet hydrogen bonding and are stable at very low concentrations and even in the presence of SDS, urea and trypsin as confirmed by circular …
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The Development and Assessment of Computational Approaches to the Thermodynamics and Kinetics of Binding
… electrostatic interactions, van der Waals forces or hydrophobic forces. Molecular recognition plays an important role in biology and mediates interactions between receptors and ligands, antigens and antibodies, nucleic acids and proteins, proteins and proteins, enzymes and substrates, and …
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Application of Extended DLVO Theory: Modeling of Flotation and Hydrophobicity of Dodecane
… by considering both hydrodynamic and surface forces involved in the process. A stream function was used to estimate the kinetic energies for thinning the water films between bubbles and particles, which were compared with the energy barriers, created by surface forces, to determine the …
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Dissecting the Role of the Lipodystrophy Protein Seipin in the Biogenesis of the Lipid Droplet Organelle
… process, driven by physicochemical and hydrophobic forces, or a regulated process driven by protein factors. The Goodman laboratory previously found evidence to suggest that seipin, mutated in the most severe cases of congenital generalized lipodystrophy, may be a key factor in the early …
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Energy Stress Causes Chaperones to Assemble Into Cytoplasmic Complexes
… Certain stresses can compromise the weak hydrophobic forces responsible for these structures and lead to protein unfolding, misfolding, and aggregation. Aggregates of proteins are hallmarks of devastating diseases such as Alzheimer’s, Parkinson’s, and Huntington’s diseases. Fortunately, …
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Analytical Potential Of Polymerized Liposomes Bound To Lanthanide Ions For Qualitative And Quantitative Analysis Of Proteins
… der Waals, electrostatic, hydrogen bonding and hydrophobic forces. A further interesting aspect of the above interaction is the "fluidity" of the membrane resident lipids, which can migrate from other regions to further enhance the complementary interactions of proteins on the initially "docked" …
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The Purification, Properties and Subunit Structure of Glycerol Dehydrogenase
… hexamer of the dimers is stabilized by ionic and hydrophobic forces Thirteen major peaks and one minor peak of enzyme activity were consistently eluted during ion-exchange experiments with the native enzyme. Polyacrylamide gel electrophoresis of the enzyme treated with dithiothreitol and urea …
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Studies of Thin Liquid Films Confined between Hydrophobic Surfaces
… in excess film entropy (£GSf), suggesting that hydrophobic force originates from changes in the structure of the medium (water) confined between hydrophobic surfaces. As a follow-up to the previous study, surface force measurements have been conducted using an atomic force microscope (AFM) with …
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Surface Forces between Silica Surfaces in CnTACl Solutions and Surface Free Energy Characterization of Talc
… methods. <i>One</i> is to directly measure the forces between two interacting surfaces in media. <i>The other</i> is to study the interfacial surface free energies of the particles in suspension. Direct surface force measurements were conducted between silica surfaces in …
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Molecular engineering of gold nanorod surfaces: towards improved physical properties and understanding nanoparticle-cell interactions
… CTAB molecules in the bilayer are held via weak hydrophobic forces and thus tend to desorb resulting in nanorods aggregation and toxicity to cultured cells. Herein, three surface-engineering approaches to enhance the colloidal physical stability and biocompatibility of gold nanorods have been …
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Modeling Flotation from First Principles Using the Hydrophobic Force as a Kinetic Parameter
… In flotation, a desired mineral is rendered hydrophobic by surfactant coating as a means to destabilize the TLFs, so that they can be attached to the hydrophobic air bubbles. A TLF ruptures when the disjoining pressure (or surface forces per unit area) of the film becomes negative, i.e., Π < …
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Investigation into the membrane interactive properties of the escherichia coli low molecular weight penicillin-binding proteins
… lipid and the involvement of predominantly hydrophobic forces which are enhanced by low pH. Similar characteristics were revealed when perturbant washes and Western blotting were used to investigate the interactions of PBP5 with membranes derived from a mutant E. coli strain, HDL 11, in …
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