in Bradford .
Written in English
Ph.D. thesis. Typescript.
|The Physical Object|
|Number of Pages||291|
Aqueous solutions of synthetic clay minerals have been studied in the presence of surfactants and water-soluble polyvinylalcohol (PVA). The PVAs (PVA 1, PVA 2) had a molecular weight of about The hydrophobic effect is the observed tendency of nonpolar substances to aggregate in an aqueous solution and exclude water molecules. The word hydrophobic literally means "water-fearing", and it describes the segregation of water and nonpolar substances, which maximizes hydrogen bonding between molecules of water and minimizes the area of contact between water and nonpolar molecules. The aggregation phenomena in aqueous solutions of hydrophobically modified (HM) chitosan, containing 4 mol % of n-dodecyl side chains, were studied by viscometry and fluorescence spectroscopy with pyrene as a probe. The results are compared with those for unmodified chitosan. Surprisingly, fluorescence data reveal the appearance of intermolecular hydrophobic aggregates . Measurement of the Hydrophobic Interaction between Two Hydrophobic Surfaces in Aqueous Electrolyte Solutions J. N. ISRAELACHVILI AND R. M. PASHLEY Department of Applied Mathematics, Institute of Advanced Studies, Research School of Physical Sciences, Australian National University, Canberra, A.C.T. , Australia Received April 6, ; accepted Septem .
The interaction between hydrophobically associating polyacrylamide (HAPAM) and dodecyl dimethyl betaine (BS) is studied through surface tension, interfacial tension (IFT), apparent viscosity, aggregation behavior, and microscopic morphologies. Results show that surface and interface properties of BS are largely affected by HAPAM. BS critical micelle concentrations are . A)The folded states of globular proteins in aqueous solutions are stabilized mainly by: (A)hydrophobic interactions (B) peptide bonds (C) phosphodiester bonds (D)ionic bonds. B)The spatial arrangement of protein subunits is called: (A) primary structure. (B) secondary structure. (C) tertiary structure. (D) quaternary structure. (E) none of the. Causes of Hydrophobic Interactions. American chemist Walter Kauzmann discovered that nonpolar substances like fat molecules tend to clump up together rather than distributing itself in a water medium, because this allow the fat molecules to have minimal contact with water.. The image above indicates that when the hydrophobes come together, they will have less contact with water. The standard free energy of hydrophobic interaction between alkyl chains has been measured in aqueous solutions of t-butanol, dioxan, dimethyl sulphoxide and dimethyl formamide. The results make it clear that hydrophobic interaction (in the sense of a pair-wise interaction between hydrophobic groups otherwise surrounded by water) is not simply.
D.N. Petsev, in Interface Science and Technology, Hydrophilic and hydrophobic interactions. Hydrophilic and hydrophobic interactions between colloids in general are related to the interactions between the particles (emulsion droplets) and the surrounding solvent (e.g., water). If the droplet surfaces “like” water, the molecules in the gap are “reluctant” to be expelled and. Effects of Hydrophobic Modification and Electrostatic Interactions on the Association Behavior in Aqueous Solutions of Poly(vinyl alcohol). A Pulsed Field Gradient NMR Study. Hydrophobic and superhydrophobic materials have been successfully applied in many sectors, such as: (I) the removal of petroleum from aqueous solutions, (II) applied to plastic, ceramics, and mesh to contribute to the oil removal from aqueous solutions, (III) hydrophobic layers have a strong self-cleaning effect on plastics, heat pipes, metals. The interaction between a colloidal polystyrene particle mounted on an AFM cantilever and a hydrophilic and a hydrophobic surface in aqueous solution is investigated. Despite the apparent simplicity of these two types of systems a variety of different types of interactions are observed. The system containing the polystyrene particle and a hydrophilic surface shows DLVO-like interactions.