Precision Adsorption–Calorimetric Investigations Of Thermodynamic Properties Of Hybrid Nanocompositions Of Diacetate Cellulose–Silica

Abstract

The precision adsorption-calorimetric method was used for investigation of water steams sorption by nanocomposites of diacetate cellulose (DAC)–silica. Isotherms were treated by equations of the theory of volume filling micropores (TVFM). By equation Gibbs-Helmholtz the mole differential entropy, differential heats of water adsorption in hybrid nanocomposite materials DAC-silica were calculated and, also dependence on time establishment of adsorption equilibrium (r) from filling of hybrid nanocomposites by molecules of water was determined. In this article possibility of using nuclear magnetic relaxation for analysis of the structure of nanocomposites and investigation their sorption properties was considered. Structural investigations were carried out by the method of atomic force microscopy (AFM). It was shown that even small additions of citric acid (CA) have influenced on micro- and nanostructures of the nanocomposite materials.