Abstract
Based on Hamaker's classical paper (1937) on the London - Van der Waals attraction between spherical particles, the concept of negative Hamaker coefficients is introduced and the conditions for attaining negative values are given. This concept remains also valid against the background of Lifshitz' macroscopic theory of interaction between solid bodies. Numerical examples calculated on the basis of this theory are presented. Experimental verification of the concept as well as simplified expressions to establish the conditions for attaining negative values are also given. Further refinements of the theory leading to the concept of Hamaker coefficients rather than to that of Hamaker constants are dealt with and the relevant role of interfacial separation is discussed.
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