期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 601, 期 -, 页码 124-132出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.05.092
关键词
Nanocellulose; Foam; Absorption; X-ray computed tomography; Structure; Wicking; Pore size
资金
- Meat and Livestock Australia (MLA) [P.PSH.0890]
The absorption capacity and kinetics of nanocellulose foams are controlled by the surface charge of the fibers, affecting swelling and network structure. The absorption process includes three stages: wicking, transition, and fiber swelling. Tuning the surface charge can modulate the absorption kinetics of nanocellulose foam.
Hypothesis: The absorption capacity and kinetics of nanocellulose foams are controlled by the surface charge of the fibers, which affects swelling and determine the porosity and structure of the network. Experiments: Absorption kinetics were quantified at time scales ranging from fractions of a second to minutes. The mass absorption rate as well as the area profile for the liquid stains were simultaneously measured. Findings: The absorption profile followed a three-stage mechanism: wicking, transition and fiber swel-ling. Absorption of fluids differing in ionic strength revealed the critical role played by electrostatic forces. Nanocellulose foam absorption capacity is 25% higher for water than for 0.9 wt% NaCl solution. The absorption kinetics of nanocellulose foam are also tuneable by modulating the surface charge. High sur -face charge nanocellulose foams have slower absorption in water than their low surface charged ana-logues. This behaviour is driven by the lower pore sizes developed in high surface charge foams, as determined by X-ray CT. Small Angle X-ray Scattering revealed structural homogeneity of high surface charge foams upon absorption of water due to high fibrillation and fiber swelling. (c) 2021 Elsevier Inc. All rights reserved.
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