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Growth and One-Dimensional Heteroepitaxy of Binary Colloidal Crystals
journal contribution
posted on 2020-03-25, 20:43 authored by Jun Nozawa, Satoshi Uda, Akiko Toyotama, Junpei Yamanaka, Hiromasa Niinomi, Junpei OkadaDue
to their tunable material properties, binary colloidal crystals
(BCCs) are highly desired for many of the same applications as colloidal
crystals. Here, we have investigated the detailed growth process of
BCCs with attractive interparticle interactions in which depletion
forces were induced between particles via added polymer. An AB2 superlattice phase (A, large; B, small) was grown under various
solution conditions, including various large-to-small particle ratios
and polymer concentrations. The solution composition at which the
AB2 phase initially nucleated shifted toward an A-rich
composition as the polymer concentration increased because the free
energy curves of AB2 and other phases displayed different
trends. This indicates that interparticle interactions played an important
role and depended on the particle structure. In situ observations revealed that BCCs typically grew via one-dimensional
heteroepitaxy, which differs from conventional colloidal epitaxial
growth, demonstrating a novel technique to control the growth of BCCs.