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Growth and One-Dimensional Heteroepitaxy of Binary Colloidal Crystals
Crystal Growth & Design ( IF 3.8 ) Pub Date : 2020-03-20 , DOI: 10.1021/acs.cgd.0c00078
Jun Nozawa 1 , Satoshi Uda 1 , Akiko Toyotama 2 , Junpei Yamanaka 2 , Hiromasa Niinomi 1 , Junpei Okada 1
Affiliation  

Due 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.

中文翻译:

二元胶体晶体的生长和一维异质外延

由于其可调谐的材料特性,对于许多与胶体晶体相同的应用,非常需要二元胶体晶体(BCC)。在这里,我们研究了具有有吸引力的颗粒间相互作用的BCC的详细生长过程,其中通过添加聚合物在颗粒之间诱导了耗尽力。AB 2超晶格相(A,大; B,小)在各种溶液条件下生长,包括各种大小比和聚合物浓度。在该AB溶液组合物2相开始成核移向富含A-组合物中的聚合物浓度增加,因为AB的自由能曲线2其他阶段则显示出不同的趋势。这表明粒子间的相互作用起着重要作用,并取决于粒子的结构。原位观察表明,BCC通常通过一维异质外延生长,这与常规的胶体外延生长不同,这表明了控制BCC生长的新技术。
更新日期:2020-03-20
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