Suspension viscosities and shape parameter of cellulose nanocrystals (CNC)

被引：186

作者：

Boluk, Yaman ^{[1
,3
]}

Lahiji, Roya ^{[2
,3
]}

Zhao, Liyan ^{[4
]}

McDermott, Mark T. ^{[2
,3
]}

机构：

[1] Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 2W2, Canada

[2] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada

[3] Natl Inst Nanotechnol, Edmonton, AB, Canada

[4] Alberta Innovates Technol Futures, Edmonton, AB T6N 1E4, Canada

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2011年 / 377卷 / 1-3期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Cellulose nanocrystals; Viscosity; Suspensions; Electroviscous; Atomic force microcopy; ATOMIC-FORCE; MICROCRYSTALLINE CELLULOSE; AQUEOUS SUSPENSIONS; CANTILEVER DYNAMICS; DISPERSIONS; WHISKERS; PHASE; RODS;

D O I：

10.1016/j.colsurfa.2011.01.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

The successful application of nanoscale materials requires an accurate description of the shape and size of the nanomaterial. Cellulose nanocrystals (CNC) are a plant-derived nanomaterial that is currently being investigated for a variety of applications. We have developed here a method to determine the shape parameter (length/diameter) of rod-like CNC particles using bulk viscosity measurements of CNC solutions. The cellulose nanocrystals were prepared by concentrated sulfuric acid hydrolysis of wood pulp. CNC particles in aqueous solutions carry negative electrical charges due to the sulfate surface groups and showed electroviscous effects. The viscosities of cellulose nanocrystals suspensions were measured at various NaCl electrolyte concentrations and intrinsic viscosities were calculated. The extrapolation of intrinsic viscosity to 1 nm Debye length was used to calculate intrinsic viscosity of hard rods without electroviscous effects. The corresponding shape factor calculated from Simha's equation was 41. Atomic force microscopy (AFM) was used to measure the shape parameter of individual CNC particles. Limited number of measurements yielded an average value of 30. Intrinsic viscosity measurements would be a reliable and relatively simple method to calculate the shape factor of rod-shaped cellulose nanocrystals after electroviscous effects are corrected. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：297 / 303

页数：7

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