Abstract
Realization of macroscopic and nanoscopic physico-chemical phenomena of several gels is proved to be due to the hydration and/or the liberation of water molecules, and dynamical properties of water cluster and their complex phase, and that they have an essential role in the biochemical mechanisms, since many of mechanisms are interpreted by the interaction between water molecules and hydrophilic polymer chains. Several behaviors of hydrogels and hydrogols such as poly (N-isopropylacrylamide), polyvinylalchol hydrogels, carrageenan, ovalbumin, and gelatin gels are discussed in terms of variations of lifetime of orhto-positronium because they reflect the behavior of radius size and numerical concentration of free volume, and its size distribution. The states of water molecules are divided into three categories — free water, associated water, and physically bound water by the present study.
