1. Use of Atomic Force Microscope for the Study of Mechanical Properties of Coal Surfaces

Abstract

Atomic force microscope (AFM) equipped with an environment-controlled chamber is used for the analyses of morphology, surface properties and mechanical properties of coal under inert atmosphere. In coal surface, three components are recognized; a layered structure at several microns, structureless and soft component, and fibrous component which gives a long range repulsive force presumably attributed to an electrostatic force. The difference of mechanical properties detected by force curve may be corresponding to heterogeneity in coal such as macerals.