二元纳米晶超的系统映射:拓在相位选择中的作用
Igor Coropceanu1, Michael A Boles1, Dmitri V Talapin1,2
1Department of Chemistry and James Franck Institute , University of Chicago , Chicago , Illinois 60637 , United States.
Journal of the American Chemical Society
|March 15, 2019
概括
纳米晶体的自我组装成二进制超级晶体 (BNSL) 是受连体软度的影响,而不仅仅是大小. 这项研究探讨了联体冠状体如何影响BNSL结构的形成和稳定性.
科学领域:
- 材料科学
- 纳米技术
- 化学物理
背景情况:
- 纳米晶体的自我组装形成了多样化的二进制超级网格结构 (BNSL).
- 传统的硬球模型无法解释BNSL的稳定性.
- 纳米晶体上的联结体冠状引入可变性,影响组装.
研究的目的:
- 研究联体冠状体在BNSL组件热力学和动力学中的作用.
- 分析有效的尺寸比率和配体软度 (L/R) 如何指导BNSL的形成.
- 评估可变形球体共结晶的理论模型.
主要方法:
- 对Au和PbS纳米晶体的核心半径 (R) 和连接物链长度 (L) 的系统调整.
- 聚合联体调节的纳米晶体成为二进制超级网格.
- 分析得到的BNSL结构,相频率和几何参数.
主要成果:
- 确定了至少15个不同的BNSL结构的多样性库.
- 发现有效的纳米晶体大小比率和软度 (L/R) 与直接组装有关.
- 观察到的阶段丰度可能与热力学稳定性和核前排序有关.
结论:
- 联结体冠状体的特性显著影响了BNSL组合,超出了简单的硬球相互作用.
- 对BNSL的核和生长因子提出了新的假设.
- 预先排列成二面体或多面体对称可能解释相位丰度.
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