Investigation of Cation-Substituted Vermiculite Deformation upon Water Vapor Sorption

✍ Scribed by A.V. Tvardovski; A.A. Fomkin; Yu.I. Tarasevich; I.G. Polyakova; V.V. Serpinski; I.M. Guseva

• Book ID: 102578730
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 279 KB
• Volume: 164
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1994.1149

✦ Synopsis

Deformations of cation-substituted vermiculite ( (\mathrm{Na}, \mathrm{Ca}), and Ba forms) upon water vapor sorption have been studied. To solve this problem a dilatometer was used. Its main part was a line differential transformer, the core of which was connected to the sorbent by means of a rod. Any changes of the sorbent height caused a change in the core position in the transformer, which influenced the signal recorded from its secondary winding. The sorbents used were plate-formed, anisotropic, and swelled only in the direction perpendicular to the plane of the plates. The results obtained were compared with the adsorption, calorimetry (a Calvet-type microcalorimeter with a microbalance attachment was used) and X-ray data. High sensitivity of the dilatometric method to the structural changes of the laminated silicates whose cell structures expand upon hydration has been shown. 1994 Academic Press, Inc.