Bridge potential uniqueness

A detailed discussion of the properties of aerogels can be found ia several recent review articles (51—55) and the references thereia. This section provides a physical basis for these properties by focusiag on the microstmcture of an aerogel. The latent is to provide a bridge between the two previous sections, which discuss the preparative and dryiag parameters that affect microstmcture, and the next one, which oudines the potential appHcations made possible by unique stmctural features. The emphasis is on siUca aerogels because they have been the most extensively characteri2ed. 

Over the course of the last several years, essential studies have been conducted in a wide variety of areas using supercritical fluids. The continued constructive development of the science employing these fluids is dependent upon a unique bridging of scientists from many disciplines involved in this work. This text, a compilation of several of the papers presented at the ACS meeting in Atlanta in the spring of 1991, attempts to illustrate the numerous scientific endeavors that have been and continue to be pursued. Individually, these works are able to stand alone in their viability. Collectively, they demonstrate the vast interest, the overwhelming potential and the extensive growth that is available. 

Given a potential of interaction in the Hamiltonian, from first principles, there corresponds uniquely a pcf g r). Then, all other correlation functions are also uniquely determined. This connection is expressed in general terms as a functional relation B = B[g r). That means, given a g(r) or some related function y(r), one can go through a functional to obtain the bridge function. Only under certain... 

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