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Effects of Inorganic Salt Electrolytes on the Rheological Properties of Nanocellulose
Received:July 29, 2020  
DOI：10.11980/j.issn.0254-508X.2020.12.002
Key Words:cellulose nanofibril  cellulose nanocrystal  rheological properties  ionic strength
Fund Project:国家自然科学基金项目（31370578，21703131）；陕西省科技厅自然科学基础研究计划项目（2014JZ013）；陕西省科技厅重点实验室科研计划项目（2011HBSZS014）；制浆造纸工程国家重点实验室开放基金资助项目（201821）。
Author NameAffiliationPostcode
LI Xinping College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
ZHANG Li College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
CHANG Hui College of Mechanical and Electrical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
WANG Nan College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
ZHANG Zhao College of Bioresources Chemical and Materials Engineering， National Demonstration Center for Experimental Light Chemistry Engineering Education， Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021
State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 		510640
CHEN Lihong Institute of Frontier Science and Technology Transfer， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
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Abstract:In this study， the effect of inorganic salt electrolytes of different anions and cations on the rheological properties of nanocellulose suspension was explored. The results showed that the suspension of cellulose nanofibril （CNF） and cellulose nanocrystal （CNC） had a “shear thinning” behavior. When the shear rate increased from 0.01 s-1 to 1000 s-1， the viscosity of the suspension decreased continuously from 1000 Pa·s to 0.1 Pa·s. When different valence metal salts NaCl， MgCl2， AlCl3， Na2CO3 and Na3PO4 were added to the nanocellulose suspension， with the increase of metal salt content from 0.001 mol/L to 0.5 mol/L， the double electrical layer on the nanocellulose surface was destroyed and the electrostatic repulsion force was weakened. Thus， the nanocellulose particles were deposited and aggregated， and the nanocellulose suspension was gelled. In addition， as the cation strength increased， the gelation became more and more obvious. Correspondingly， the viscosity of the suspension increased， and the storage modulus and loss modulus also increased. In contrast， influenced by the “electrostatic repulsion effect” of metal ions， the viscosity and modulus of suspension at the increase of anionic strength had little change， the anions had no obvious damage to the double layer on the surface of the nanocellulose， so the interaction between nanocellulose could not be significantly reduced. Therefore， the increase of anionic strength had little effect on the gelation of nanocellulose suspension.
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