单壁碳纳米管存在下聚乙烯醇溶液结晶的观察

Observations on Solution Crystallization of Poly(vinyl alcohol) in the Presence of Single-Wall Carbon Nanotubes.

作者信息

Minus Marilyn L, Chae Han Gi, Kumar Satish

机构信息

Georgia Institute of Technology, School of Polymer, Textile, and Fiber Engineering, 801 Ferst Drive, NW MRDC-1, Atlanta, Georgia 30332-0295, USA.

出版信息

Macromol Rapid Commun. 2010 Feb 2;31(3):310-6. doi: 10.1002/marc.200900539.

DOI:10.1002/marc.200900539

PMID:21590908

Abstract

PVA/SWNT dispersions yield aloe plant-like crystals, where the leaves are single crystals templated by PVA coated SWNT. Longer growth times (≈18 months) lead to hexagonal rod-like crystals. HR-TEM images show evidence that PVA molecules are aligned parallel to the SWNT axis. WAXD, electron diffraction, and HR-TEM observations of these aloe plant and hexagonal crystals suggests evidence for possible PVA-SWNT epitaxy. Wide-angle and electron diffraction data of these crystals also show that the structure seems to mimic the 2D hexagonal crystal packing of SWNT. PVA lattice images and moiré fringes were also observed in the leaf-like crystals.

摘要

聚乙烯醇/单壁碳纳米管分散体产生芦荟植物状晶体，其中叶片是由涂覆有聚乙烯醇的单壁碳纳米管模板化的单晶。较长的生长时间（约18个月）会导致形成六方棒状晶体。高分辨率透射电子显微镜图像显示有证据表明聚乙烯醇分子与单壁碳纳米管轴平行排列。对这些芦荟植物状和六方晶体的广角X射线衍射、电子衍射和高分辨率透射电子显微镜观察表明可能存在聚乙烯醇-单壁碳纳米管外延的证据。这些晶体的广角和电子衍射数据还表明，其结构似乎模仿了单壁碳纳米管的二维六方晶体堆积。在叶状晶体中也观察到了聚乙烯醇晶格图像和莫尔条纹。