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

• Published in: Journal of colloid and interface science 2006-10, Vol.302 (1), p.87-94
• Main Authors: Wu, Aihua, Shen, Xinghai, He, Yongke
• Format: Article
• Language: English
• Subjects: beta-Cyclodextrins - chemistry; Chemistry; Cyclodextrin nanotube; Dynamic light scattering (DLS); Exact sciences and technology; General and physical chemistry; Hydrogen bonding; Micrometer-sized rod; Microscopy, Electron, Transmission - methods; Microscopy, Fluorescence - methods; Molecular Structure; Nanostructures - chemistry; Nanotubes - chemistry; Particle Size; Scattering, Radiation; Secondary assembly; Sensitivity and Specificity; Solutions - chemistry; Surface Properties; Transmission electron microscopy (TEM)
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2006.05.065

In this work, we report the observation on the self-assembly of β-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– β-CD nanotube. The effect of light scattering on the measurement of fluorescence anisotropy of PBD in the aqueous solutions of β-CD is corrected. A new mechanism of cyclodextrin aggregation is proposed for this system. Description: High-resolution TEM micrograph of the micrometer-sized rodlike structure formed by the secondary assembly of PBD– β-CD nanotubes. [ PBD ] = 1 × 10 −5   M , [ β - CD ] = 10   mM .