SOME REMARKS ON SURFACE FREE ENERGY OF POLISH COALS |
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| Authors: | Wies?aw W[odot]jcik Bronis?aw Ja[ndot]czuk Tomasz Bia?opiotrowicz |
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| Affiliation: | Department of Physical Chemistry , Institute of Chemistry, Maria Curie-Sklodowska University , pl. Marii Curie-Sk?odowskiej 3, Lublin, 20-031, Poland |
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| Abstract: | ABSTRACT On the basis of the studies concerning the determination of the surface free energy of Polish coals published earlier analyses of the equilibrium state of three-phase system were carried out. The three-phase systems were: 1) coal - liquid drop - air, 2) coal - water drop -air, 3) coal - water drop - hydrocarbon, 4) coal -hydrocarbon drop - water and 5) coal - air bubble -water. Analysing the measured values of the contact angles in the systems studied the occurrence of a liquid film on the coal surface was taken into account. The surface free energy. of Polish coals results from both dispersion (Ts d) and nondispersion (Ts n) intermolecular interaction. A distinct relationship was found between the dispersion components of the surface free energy and coal ranks. |
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