Dispersion and Rheological Properties of Aqueous Graphene Suspensions in Presence of Nanocrystalline Cellulose
The possibility and feasibility of nanocrystalline cellulose (NCC) for dispersing hydrophobic graphene in aqueous solutions were studied in the present work. The dispersion properties of graphene particles in aqueous media as a function of various amounts of NCC were investigated. The rheological behavior of NCC-dispersed graphene suspensions was studied, and a polynomial model was proposed and employed to simulate the obtained shear flow of graphene suspensions. The results of UV–Vis analysis and sedimentation test suggested that the increased NCC addition significantly led to the improved dispersion properties of graphene suspensions. Rheological behavior measurements demonstrated that graphene suspensions exhibited a reduction trend in the shear viscosity, shear stress, and viscoelasticity with the increased amount of NCC addition. Meanwhile, the shear viscosity and shear stress of graphene suspensions were found to show a dependency on the process temperature. The above results supported the conclusion that NCC is a promising candidate for improving the dispersion and flowability of graphene in aqueous media.
KeywordsNanocrystalline cellulose Dispersant Graphene Rheological behavior Dispersion properties
This work was financially supported by the Zhejiang Provincial Natural Science Foundation of China (Grant No. LY14C160003), National Natural Science Foundation of China (Grant No. 31100442), the Public Projects of Zhejiang Province (Grant Nos. 2016C31075, 2017C31059), Zhejiang Provincial Top Key Academic Discipline of Chemical Engineering, Technology, Zhejiang Open Foundation of the Most Important Subjects (Grant No. 2016KF01), 521 Talent Cultivation Program of Zhejiang Sci-Tech University (Grant No. 11110132521310) and Open Foundation of the Key Lab of Pulp and Paper Science & Technology of Ministry of Education, Qilu University of Technology (Grant No. KF201403), Open Foundation of Key Lab of Biomass Energy and Material of Jiangsu Province (Grant No. JSBEM201602), and Open Foundation of Key Laboratory of Renewable Energy, Chinese Academy of Sciences (Grant No. Y607s11001). and the Science and Technology Projects of Hangzhou City (Grant No. 20150533B83).
YT and XZ conceived and designed the experiments; XZ, XW and DG performed the experiments and analyzed the data; XZ, YT, JZ and XZ wrote the paper. All authors reviewed the manuscript.
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflict of interest.
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