TEMPO-oxidised cellulose nanofibrils; probing the mechanisms of gelation via small angle X-ray scattering

被引：43

作者：

Schmitt, Julien ^{[1
]}

Calabrese, Vincenzo ^{[1
]}

da Silva, Marcelo A. ^{[1
]}

Lindhoud, Saskia ^{[1
]}

Alfredsson, Viveka ^{[2
]}

Scott, Janet L. ^{[1
,3
]}

Edler, Karen J. ^{[1
]}

机构：

[1] Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England

[2] Lund Univ, Phys Chem, Box 124, SE-22100 Lund, Sweden

[3] Univ Bath, Ctr Sustainable Chem Technol, Bath BA2 7AY, Avon, England

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2018年 / 20卷 / 23期

基金：

英国工程与自然科学研究理事会;

关键词：

AQUEOUS SUSPENSION; WORMLIKE MICELLES; NANOCRYSTALS; AGGREGATION; POLYMERS; NEUTRON; GELS; OXIDATION; HYDROGEL; DELIVERY;

D O I：

10.1039/c8cp00355f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structure of dispersions of TEMPO-oxidised cellulose nanofibrils (OCNF), at various concentrations, in water and in NaCl aqueous solutions, was probed using small angle X-ray scattering (SAXS). OCNF are modelled as rod-like particles with an elliptical cross-section of 10 nm and a length greater than 100 nm. As OCNF concentration increases above 1.5 wt%, repulsive interactions between fibrils are evidenced, modelled by the interaction parameter nu(RPA) > 0. This corresponds to gel-like behaviour, where G' > G '' and the storage modulus, G', shows weak frequency dependence. Hydrogels can also be formed at OCNF concentration of 1 wt% in 0.1 M NaCl(aq). SAXS patterns shows an increase of the intensity at low angle that is modelled by attractive interactions (nu(RPA) < 0) between OCNF, arising from the screening of the surface charge of the fibrils. Results are supported by zeta potential and cryo-TEM measurements.

引用

页码：16012 / 16020

页数：9

共 52 条

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