Wetting and adhesion

Introduction to Applied Colloid and Surface Chemistry, First Edition. Georgios M. Kontogeorgis and S0ren Kiil. 2016 John Wiley Sons, Ltd. Published 2016 by John Wiley Sons, Ltd. 

Some important concepts for the understanding of interfacial forces have been developed in the field of high-temperature wetting by liquid metals. 

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Tinplate for containers and closures is often decorated by colour printing and protected by clear lacquers. No surface preparation is carried out and difficulties with wetting and adhesion, sometimes associated with the character of the oxide layers on the surface, are rare. 

Surface topography its influence on wetting and adhesion in a dental adhesive system. Journal of Dental Research, 51, 780-8. 

The composition and functionality of the systems greatly vary according to the substrate material to be coated, as they demand different curing conditions, adapted physical properties and characteristics as well as functionality for better wetting and adhesion. Dyes, pigments... 

The critical surface tension value for most inorganic solids is in the hundreds or thousands of dynes per centimeter. For polymers and organic liquids, it is at least an order of magnitude lower. Critical surface tension is an important concept that leads to a better understanding of wetting and adhesion. 

This equation is basic for determination of interfacial tension and for explaining phenomena of wetting and adhesion [iii-v] including electrochemical experiments [vi]. For the work of adhesion between two immiscible liquids see -> Dupre equation. 

In order to obtain the maximum improvement in wetting and adhesion for a A/oxide system, the alloying element B must satisfy the conditions that generated... 

The propoxylation gives a monomer with excellent pigment wetting and adhesion properties. 

Suggested industrial uses of carbohydrate xanthates, apart from the cellulose Viscose process, include the flotation of minerals and the production of plastics. Two patents by Brown and his associate claim an effective purification of both iron ore and silvinite ore by froth-flotation processes employing, for example, sodium starch xanthate, pine oil, and a suitable amine. Silberstein obtained plastic masses from mixtures of sodium dextrin xanthate with urea, formaldehyde, or glyceritol. Starch xanthate has been suggested as a dispersing, wetting, and adhesive ma-... 

The study of forces between deformable interfaces can be broken into two categories, the interactions between two sets of deformable interfaces (e.g., two oil drops in water), or a rigid particle and a single deformable interface. Study of the forces in these systems is motivated by the prevalence of both types of systems (drop-drop or drop-rigid particle) in industrial problems. For example, wetting and adhesion of oil emulsions in porous media are concerns in the petroleum industry for both liquid/liquid separations and oil recovery [1]. An understanding of the interaction forces between... 

The polyester type polyols used in polyurethane laminating adhesives are produced by the direct esterification of polyfunctional carboxylic acids and glycols. Polyester polyols provide the soft segment in polyurethane products giving the adhesive flexibility. Ester groups of the polyol also contribute to adhesion. Polyester polyols provide limited wetting and adhesion of olefinic surfaces with amide slip additives (in contrast to polyether polyols). Typical examples include adipic acid, caprolactone, maleic acid and isophthalic based polyester polyols. 

Phenomenologically speaking, wetting and adhesion are related. Adhesion is the attachment of particles, or drops, onto surfaces, or of two macrobodies of whatever geometry to each other. Consider a solid or liquid sphere, approaching a surface S, through medium 2, until attachment and spreading, if possible, occurs (see flg. 5.7). This process can be divided into two steps. 

Major new insights into the surface science of silicone materials were catalyzed by the work of deGennes, whose theories of polymer wetting and adhesion have inspired many to explore his provocative themes [7]. These explorations focused attention on the need for a polymeric material that is well characterized, liquid over a wide molecular weight range, with controlled molecular weight distribution and crosslinkable in a controlled fashion. Dimethylpolysiloxane is the best available candidate and has become central to a revolution in polymer surface physics. 

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