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Volume 3, Issue 4 (Suppl)
Polym Sci
ISSN: 2471-9935 Polym Sci, an open access journal
October 12-13, 2017 Osaka, Japan
Annual Meeting on
Biopolymers and Drug Delivery Systems
Biopolymers Meeting 2017
October 12-13 2017
Page 27
Influence of surface charge density and NaCl concentration on the intrinsic viscosity of cellulose
nanocrystal suspensions
Siqun Wang
1
, Qian Li
1
, Qiang Wu
2
, Xiuwen Li
2
and Shenyuan Fu
2
1
University of Tennessee, USA
2
Zhejiang A&F University, China
C
ellulose Nanocrystals (CNCs) with similar size and various surface charge densities were prepared by sulfuric acid hydrolysis and
NaOH desulfation. The influence of surface charge density and NaCl concentration on the intrinsic viscosity of CNC suspensions
and predicted aspect ratio were investigated by Ubbelohde viscometer. With decreased CNC surface charge density, the intrinsic
viscosity initially decreased due to the electric double layers on the CNC surface and subsequently increased due to CNC aggregation.
To screen electro viscous effect, NaCl was added into CNC suspensions. With increased NaCl concentration, the intrinsic viscosity of
CNC suspensions first decreased and then increased. The aspect ratios of CNCs predicted by Batchelor equation from the minimum
intrinsic viscosity were consistent with that measured by transmission electron microscopy (TEM). Suspensions of CNCs with
higher surface charge density needed less NaCl to obtain minimum intrinsic viscosity. The NaCl content that should be added to the
suspension to predict the actual physical aspect ratio of CNC can be estimated by Debye-Hückel theory, assuming that the Debye
length is equal to the CNC diameter.
Biography
Siqun Wang is a Professor in the UT Center for Renewable Carbon. His research interests include nano-mechanics, cellulose nano-materials, bio-based carbon
materials, manufacture and performance of wood-based composites, natural fiber-reinforced plastic composites, bio-nanocomposites, wood adhesion, cellulose
nano-material impact on soil, soil recovery, heavy metal removal from water and wood quality. He has authored or co-authored more than 200 referred journal
articles.
swang@utk.eduSiqun Wang et al., Polym Sci 2017, 3:4
DOI: 10.4172/2471-9935-C1-005