Colloidal Particles at Liquid Interfaces by Bernard P. Binks, Tommy S. Horozov

Chemical Engineering

By Bernard P. Binks, Tommy S. Horozov

Small strong debris adsorbed at liquid interfaces come up in lots of commercial items and procedure, corresponding to anti-foam formulations, crude oil emulsions and flotation. They act in lots of methods like conventional surfactant molecules, yet provide specific benefits. although, the certainty of ways those debris function in such platforms is minimum. This ebook brings jointly the varied issues actively being investigated, with contributions from major specialists within the box. After an advent to the elemental techniques and rules, the e-book divides into sections. the 1st bargains with debris at planar liquid interfaces, with chapters of an experimental and theoretical nature. the second one concentrates at the behaviour of debris at curved liquid interfaces, together with particle-stabilized foams and emulsions and new fabrics derived from such structures. This assortment might be of curiosity to educational researchers and graduate scholars in chemistry, physics, chemical engineering, pharmacy, foodstuff technological know-how and fabrics technology.

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E. coalescence) occurs in these emulsions when a strong field is applied. The drops as a whole are compressed on reaching the bottom of the vessel and the strong field causes the adsorbed particles to be stripped from the drop interfaces and sediment at the bottom. 25(c)). 9 kA mϪ1) destabilises the entire emulsion leading to a completely phase separated system. By applying a square wave magnetic field (on–off), the reversibility of the destruction and re-formation of the emulsion was tested over 100 cycles.

8). Acid dissociation is more energetically unfavourable when such groups are at an interface (particle or drop) compared with isolated groups in bulk because of the proximity of other similar charged groups, which generate a surface potential ␺. 25 nm2. Due to the existence of an electrostatic field around a negatively charged particle, protons are held more strongly at the surface and the surface pH is lower than that in bulk. Dissociation of weak acid groups on a surface will therefore only be complete at higher pH in solution compared with that of a weak acid in bulk.

Horizontal particle monolayers are often used as model systems for studying colloidal aggregation since particle locations and their evolution can be detected easier in two rather than in three dimensions by optical microscopy. Certain spherical particles, however, self-organise into well-ordered two-dimensional crystal structures with very large separations between particles instead of forming aggregates. This particle behaviour is attributed to long-range electrostatic interactions between dipoles and/or charges (monopoles) at that part of the particle surface which is in contact with oil or air.

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