Epitaxial growth of carbonaceous mesophase on coke surface

Surface anchoring occurs when planar molecules of carbonaceous mesophase interact with a foreign substrate. This interaction can result in either face-on or edge-on surface anchoring, depending on the substrate's nature. However, our study delves beyond conventional surface anchoring phenomena, revealing a remarkable epitaxial growth mechanism between carbonaceous mesophase and needle coke (NC) surfaces. Here, we observe the replication of planar liquid crystal molecules onto the basal planes of coke, leading to epitaxial growth. Following carbonization, this growth results in a fused NC/binder interface. Our investigation extends throughout graphitization stages. Optical texture analyses demonstrate coherent orientation between the mesophase-derived binder and the coke substrate, maintained up to 2500 degrees C. Moreover, observations of intragranular crack morphology validate the strength of the fused filler/binder interface. Such findings underscore the pivotal role of epitaxial growth in forming interface structure and mechanical robustness in graphite. This study elucidates the fundamental role of epitaxial growth in shaping the interfacial structure of carbonaceous mesophase on coke surfaces, offering insights into graphite's mechanical properties and paving the way for advanced carbon material design.