نتایج جستجو برای: periodic materials
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Photonic crystals are periodic dielctric or metallic materials that have the property to forbid the propagation for the electromagnetic waves whose frequency is included within their frequency bandgap. This frequency bandgap depends on the permittivity of the dielectric materials used, their dimensions, their periodicity, and the incidence angle of the electromagnetic waves. Another well-known ...
The rise of 2D materials made it possible to form heterostructures held together by weak interplanar van der Waals interactions. Within such van der Waals heterostructures, the occurrence of 2D periodic potentials significantly modifies the electronic structure of single sheets within the stack, therefore modulating the material properties. However, these periodic potentials are determined by t...
A contemporary question in the intensely active field of periodic mesoporous organosilica (PMO) materials is how large a silsesquioxane precursor can be self-assembled under template direction into the pore walls of an ordered mesostructure. An answer to this question is beginning to emerge with the ability to synthesize dendrimer, buckyball, and polyhedral oligomeric silsesquioxane PMOs. In th...
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