期刊
ACS NANO
卷 9, 期 7, 页码 6944-6950出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b01116
关键词
systems phenomena; colloidal model systems; nonclassical nucleation; analytical ultracentrifugation; self-assembly
类别
资金
- Chinese Scholarship Council
Given a certain binary phase, its crystal structure can usually be rationalized by thermodynamics and packing rules. However, there is still no fundamental understanding of how metastable solids form and how this is influenced by kinetic factors. Furthermore, the very early stages of crystallization remain vague. We present an experimental study using a binary mixture of colloidal particles as a model. Particle assembly is provoked by centrifugation, and the degree of separation can be adjusted precisely. Between the scenarios of random mixture (glassy state) and complete phase separation, conditions could be realized to facilitate the occurrence of various periodic structures in a single experiment. Some of these structures can only be explained by a dynamic, nonequilibrium and dissipative state. Eventually, the formation of certain metastable lattices can be interpreted as an emergent, systemic phenomenon. Thus, centrifugation can be used for studying the chaos order transition in complex particle systems.
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