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

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/m 2 and γC p = 13...

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Veröffentlicht in:	Fuel Sci. Technol. Int.; (United States) 1989-01, Vol.7 (1), p.89-101
1. Verfasser:	Staszczuk, Piotr
Format:	Artikel
Sprache:	eng
Schlagworte:	01 COAL, LIGNITE, AND PEAT 010600 - Coal, Lignite, & Peat- Properties & Composition Applied sciences CALCULATION METHODS CARBONACEOUS MATERIALS CHEMICAL REACTIONS COAL Coal and derived products DATA ANALYSIS DERIVATIZATION DISPERSIONS ENERGY ENERGY SOURCES Exact sciences and technology FOSSIL FUELS FREE ENERGY FUELS HETEROGENEOUS EFFECTS MATERIALS PHYSICAL PROPERTIES Structure, chemical and physical properties SURFACE PROPERTIES THERMODYNAMIC PROPERTIES
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Zusammenfassung:	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/m 2 and γC p = 13.2 mJ/m 2 ) 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.
ISSN:	0884-3759
DOI:	10.1080/08843758908962233