Study on Surface Dynamic Behavior and Critical Surface Tension of Coal with Different Metamorphic Grades
LIU Qian
GUO Yusen
LAI Yongming
LIN Luyao
Abstract：In order to study the dynamic behavior and critical surface tension of coal with different metamorphic grades, the pendant drop method was used to test the surface tension of alkyl glucoside ( APG ) solution in different concentrations at the constant temperature of 27 ℃, and the dynamic continuous tracking measurement mode of the sessile drop method was used to study the change of the surface contact angle of APG solution in different concentrations with time. The results showed that the contact angle of water on coal surface was relative large, but its change was not obvious;with the increase of APG concentration, the contact angle of APG on coal surface decreased while the change magnitude of the contact angle increased, when APG concentration exceeded the critical micelle concentration, the contact angle further reduced, so did its change magnitude; the cosine value of the contact angle was significantly correlated with the critical surface tension, they were in a negative correlation;with the increase of the metamorphic grade of coal, the critical surface tension first decreased and then increased.
Keywords：metamorphic coaldynamic behaviorcritical surface tensiondynamic contact anglesurfactant
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 35-39 )