Gravitational Annealing of Colloidal Crystals
Yoshihisa Suzuki, Jin Endoh, Atsushi Mori, Tomoki Yabutani, Katsuhiro, Tamura
TL;DR
This study investigates how high gravity annealing affects the structure of silica colloidal crystals, revealing both reduction and formation of stacking disorders depending on local conditions.
Contribution
It introduces a novel gravitational annealing process using centrifugation to modify colloidal crystal structures and observes its effects on stacking disorders.
Findings
Decreased striations indicating shrinkage of stacking disorders.
Increased striations suggesting formation of new stacking disorder.
High gravity influences colloidal crystal ordering in complex ways.
Abstract
A silica colloidal crystal obtained by centrifugation at 9 G for 2 days in water was annealed by additional stronger centrifugation at 50 G for 5 days. The number of the striations observed in the colloidal crystal under crossed polarized light decreased at some parts in a growth container after additional centrifugation, while the number alse increase at the other parts. The decrease probably shows the shrinkage of the stacking disorders under high gravity, while the increase probably shows the production of new stacking disorder.
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