Boron carbide spherical particles encapsulated in graphite prepared by pulsed laser irradiation of boron in liquid medium

摘要

B_4C submicron particles were obtained by laser irradiation of B particles in ethyl acetate under atmospheric pressure and room temperature. Absorbed laser energy brought about B melting and decomposition of surrounding liquid medium molecules, leading to a reaction between the melted B and carbon species to form B_4C. Moreover, the obtained B_4C particles were encapsulated in a graphite layer. Such a graphite surface layer is useful for medical functionalization of particles. Thus, obtained B_4C particles encapsulated in graphite are expected to be promising agents for boron neutron capture therapy.