树突二皮质毛孔的自我组装,结构和逆结构分析经历了可逆的圆形到圆形的形状变化
Mihai Peterca1, Virgil Percec, Andrés E Dulcey
1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
Journal of the American Chemical Society
|May 18, 2006
概括
树突性二化物自组装成多孔的柱子,形成有序的阵列. 一种新的X射线衍射方法精确地测量了这些超分子孔的尺寸,适用于各种柱状形状.
科学领域:
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 树突二是复杂的分子,具有自我组装的潜力.
- 了解这些分子的自我组装对于设计新型纳米材料至关重要.
- 控制自组装结构的形态是材料科学中的一个关键挑战.
研究的目的:
- 为了合成新的树突性二.
- 为了研究它们的自我组装成多孔的柱状结构.
- 开发一种方法来描述这些超分子孔的尺寸.
主要方法:
- 合成特定的树突二: (4-3,4-3,5-4) 12G2-CH(2) -Boc-L-Tyr-L-Ala-OMe和 (4-3, 4-3,5-4) 12G2-CH(2) -Boc-D-Tyr-D-Ala-OMe. 这两种树突二的合成方法是:
- 在粉末样品和对齐的纤维上微角和广角X射线衍射 (XRD).
- 重建XRD数据以确定结构尺寸.
主要成果:
- 树突性二化物自组装成多孔的圆和圆柱.
- 这些柱子组织成以中心为中心的矩形和六角形柱状阵列.
- 热史影响圆柱和圆柱之间的过渡.
- 通过XRD数据重建,开发了一种可靠的方法来确定空洞圆和圆柱的尺寸.
- 实现了圆型上分子孔的结构和逆结构分析.
结论:
- 合成的树突性二呈现出受控的自我组装成有序的柱状结构.
- 一种基于XRD的可通用方法允许精确确定超分子孔尺寸.
- 这种技术对于在自组装材料中对各种各样的柱状孔的特征有价值.
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