A New Analytical Approach Regarding the Orientational Structure of Absorbed Water Molecules in the Clay

Nuclear magnetic study on absorbed water in soils (IV)

Abstract

In 1938 and 1942, S. B. Hendricks et al. and H. H. Macey reported that the absorbed water in the clay seem to be frozen structure. But their reports were not confirmed experimentally. The author experimentally calculated the second moments by using the N. M. R. spectra of the proton. On the other hand, the author described this process regarding the method for calculating theoretical second moments by the considering the lattice of the Kaolinite clay. By this method, the theoretical second moments could be calculated using drying Kaolinite clay. The theoretical values agreed well with the experimental results (Fig. 7), and it verified that the method was correct. Next, the theoretical second moments of S. B. Hendricks et al. and H. H. Macey's model were calculated in the random orientation of the clay particles. It was compared with the experimental results of the theoretical results.
The distance was 3.0 Å between absorbed water molecules and the neighboring molecules in S. B. Hendricks' model, with the theoretical results in good agreement with the experimental results (Fig. 9). However, H. H. Macey's model, the theoretical results were larger than the experimental results (Fig. 9), because the distance of 2.76 Å between absorbed water molecules and their neighboring molecules was relatively small.