ON THE DETERMINATION OF SURFACE FREE ENERGY OF COAL BY MEANS OF THE DERIVATOGRAPH

1 January 1989

journal article
research article
Published by Taylor & Francis in Fuel Science and Technology International

Vol. 7 (1) , 89-101
https://doi.org/10.1080/08843758908962233

Abstract

The calculations of the dispersion γC^d and nondispersion (polar γC^p components of surface free energy of coal on the basis of adsorption measurements of nonpolar (n-heptane) and polar (methanol, propanol, water) liquid vapours a 20°C are presented. Average values ( γC^d = 45.1 mJ/m² and γC^p = 13.2 mJ/m²) are in good agreement with literature data calculated on the basis of separate and independent measurements. The heterogeneous nature of coal surface has been confirmed from derivatographic measurements.

Keywords

DERIVATOGRAPH
SURFACE FREE
FREE ENERGY
DETERMINATION
COAL BY MEANS

This publication has 1 reference indexed in Scilit:

Interfacial Energy, Structure, and Adhesion between Polymers
Published by Elsevier ,1978