En -surface chemistry and applications

 Preface

Volume I of Adhesion Science and Engineering dealt with the mechanics of

adhesive bonds and the rheology of adhesives. Volume I1 deals with the other two

disciplines that make up adhesion science, surfaces and chemistry. In addition,

this volume describes several applications of adhesion science and engineering.

The volume begins with discussions of aspects of surface science and how they

relate to adhesion science. Methods based on surface thermodynamics have been

powerful tools in the hands of adhesion scientists. Berg introduces us to the topics

of interfacial thermodynamic and practical adhesion and shows how the critical

predictive parameters of adhesion can be obtained from wetting, solution theory and

group contribution methods (UNIFAC). It becomes clear from Berg’s presentation

that the predictions of adhesion strengths by the traditional wet chemical methods

are somewhat empirical. This limitation can be partially overcome by the methods

of contact mechanics as pioneered by Johnson, Kendall and Roberts, which allows

direct measurements of the surface energies of deformable solids. These methods,

as shown by Mangipudi and Falsafi, have played a very important role in developing

a deeper understanding of the relationship between adhesion and the chemical

composition of surfaces and complement the chapters describing contact mechanics

found in Volume I. Rimai and Quesnel extend this discussion to the interaction

of powdered solids and give us an in-depth view of the types of intermolecular

forces that control adhesion of solid surfaces. The chapter by Wahl and Syed Asif

explores the behavior of adhesion and contact mechanics at the nanoscopic level.

This chapter not only complements the above three but also describes additional

techniques that may be used to probe the properties of surfaces. Surface roughness,

which could be examined by some of the probe techniques described in Chapter 4,

is discussed by Packham. Spectroscopic techniques useful for examination of the

chemistry of surface and interfaces are described by Boerio (Chapter 6).

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