期刊
NANOSCALE
卷 12, 期 33, 页码 17480-17493出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr04491a
关键词
-
类别
资金
- Swiss National Science Foundation (SNSF) [PZ00P2_167900]
- Adolphe Merkle Foundation
- KU Leuven [C14/18/061, IDN/19/014]
- Research Foundation Flanders [G.0C60.13N]
- European Union's European Fund for Regional Development
- Flanders Innovation & Entrepreneurship
- NSF [DMR-0520547]
- European Union's Horizon 2020 research and innovation program under the SINE2020 project [654000]
- Provincie West-Vlaanderen (Accelerate3 project, Interreg Vlaanderen-Nederland program)
Cellulose nanocrystals (CNCs) are bio-based rod-like nanoparticles with a quickly expanding market. Despite the fact that a variety of production routes and starting cellulose sources are employed, all industrially produced CNCs consist of cellulose I (CNC-I), the native crystalline allomorph of cellulose. Here a comparative study of the physico-chemical properties and liquid crystalline behavior of CNCs produced from cellulose II (CNC-II) and typical CNC-I is reported. CNC-I and CNC-II are isolated by sulfuric acid hydrolysis of cotton and mercerized cotton, respectively. The two allomorphs display similar surface charge densities and zeta-potentials and both have a right-handed twist, but CNC-II have a slightly smaller average length and aspect ratio, and are less hygroscopic. Interestingly, the self-assembly behavior of CNC-I and CNC-II in water is different. Whilst CNC-I forms a chiral nematic phase, CNC-II initially phase separates into an upper isotropic and a lower nematic liquid crystalline phase, before a slow reorganization into a large-pitch chiral nematic texture occurs. This is potentially caused by a combination of factors, including the inferred faster rotational diffusion of CNC-II and the different crystal structures of CNC-I and CNC-II, which are responsible for the presence and absence of a giant dipole moment, respectively.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据