由环糊精纳米管二次组装形成的微米级棒状结构。

Micrometer-sized rodlike structure formed by the secondary assembly of cyclodextrin nanotube.

作者信息

Wu Aihua, Shen Xinghai, He Yongke

机构信息

Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China.

出版信息

J Colloid Interface Sci. 2006 Oct 1;302(1):87-94. doi: 10.1016/j.jcis.2006.05.065. Epub 2006 Jun 8.

DOI:10.1016/j.jcis.2006.05.065

PMID:16797574

Abstract

In this work, we report the observation on the self-assembly of beta-CD nanotube induced by 2-phenyl-5-(4-diphenylyl)1,3,4-oxadiazole (PBD) molecule with fluorescence microscopy and transmission electron microscopy (TEM). Micrometer-sized rodlike structure is formed by the secondary assembly of cyclodextrin nanotube driven by the inter-nanotubular hydrogen bonding. The effects of pH value, urea, DMF and NaCl on the formation of the rodlike structure are investigated. Dynamic light scattering (DLS) is applied to further characterize the formation of the PBD-beta-CD nanotube. The effect of light scattering on the measurement of fluorescence anisotropy of PBD in the aqueous solutions of beta-CD is corrected. A new mechanism of cyclodextrin aggregation is proposed for this system.

摘要

在本工作中，我们通过荧光显微镜和透射电子显微镜（TEM）报道了对由2-苯基-5-（4-二苯基）-1,3,4-恶二唑（PBD）分子诱导的β-环糊精纳米管自组装的观察。微米级的棒状结构是由纳米管间氢键驱动的环糊精纳米管二次组装形成的。研究了pH值、尿素、N,N-二甲基甲酰胺（DMF）和氯化钠对棒状结构形成的影响。应用动态光散射（DLS）进一步表征PBD-β-环糊精纳米管的形成。校正了光散射对β-环糊精水溶液中PBD荧光各向异性测量的影响。针对该体系提出了一种新的环糊精聚集机制。