Understanding shape and morphology of unusual tubular starch nanocrystals

被引:41
作者
Gong, Bei [1 ]
Liu, Wenxia [1 ]
Tan, Hua [1 ]
Yu, Dehai [1 ]
Song, Zhaoping [1 ]
Lucia, Lucian A. [1 ,2 ]
机构
[1] Qilu Univ Technol, Key Lab Pulp & Paper Sci & Technol, Minist Educ, Jinan 250353, Shandong, Peoples R China
[2] North Carolina State Univ, Dept Chem, Forest Biomat, Raleigh, NC 27695 USA
基金
中国国家自然科学基金;
关键词
Starch nanocrystals; Chemical transformation; Self-assembly; Tubular structures; ACID-HYDROLYSIS; WAXY MAIZE; GRANULE STRUCTURE; NANOPARTICLES; NANOCOMPOSITES; FILMS; POLYMERIZATION; SUSPENSIONS;
D O I
10.1016/j.carbpol.2016.06.010
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Starch nanocrystals (SNC) are aptly described as the insoluble degradation byproducts of starch granules that purportedly display morphologies that are platelet-like, round, square, and oval-like. In this work, we reported the preparation of SNC with unprecedented tubular structures through sulfuric acid hydrolysis of normal maize starch, subsequent exposure to ammonia and relaxation at 4 degrees C. High-resolution transmission electron microscopy observation clearly proved that the SNCs possess tubular nanostructures with polygonal cross-section. After further reviewing the transformations of SNC by acid hydrolysis, ammonia treatment, and curing time at 4 degrees C, a mechanism for T-SNC formation is suggested. It is conjectured that T-SNC gradually self-assembles by combination of smaller platelet-like/square nanocrystals likely loosely aggregated by starch molecular chains from residual amorphous regions. This work paves the way for the pursuit of new approaches for the preparation of starch-based nanomaterials possessing unique morphologies. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:666 / 675
页数:10
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