TY - JOUR
DP - National Agricultural Library
DB - PubAg
JO - RSC advances
TI - An analysis on the electrophoretic mobility of cellulose nanocrystals as thin cylinders: relaxation and end effect
A1 - Lin, Kuan-Hsuan
A4 - Lin, Kuan-Hsuan
A4 - Hu, Donghao
A4 - Sugimoto, Takuya
A4 - Chang, Feng-Cheng
A4 - Kobayashi, Motoyoshi
A4 - Enomae, Toshiharu
EP - 2019 v.9 no.58
KW - acid hydrolysis
KW - cellulose
KW - cellulosic fibers
KW - electrophoresis
KW - equations
KW - nanocrystals
KW - sulfates
KW - sulfuric acid
AN - 6750042
AB - Cellulose nanocrystals (CNCs) are extracted from cellulosic fibers via sulfuric acid hydrolysis and found to exhibit unique properties due to their nanoscale, ordered structure, and surface morphology. The dispersion stability of a CNC suspension is a significant factor when CNCs are applied for reinforcement of a composite or ink jet printing. Since sulfuric acid hydrolysis introduces sulfate groups on CNC surfaces, we considered that charging conditions needed to be characterized, typically based on electrophoretic mobility. After the electrophoretic mobility was measured, several theoretical equations were applied to fit those values to assume the proper CNC particle shape. While Smoluchowski's equation is often used for this purpose, its applicability to CNCs should be reconsidered due to the thin, rod-like shape of CNCs with a finite length and high charge density. In this sense, we measured the surface charge and electrophoretic mobility of well-characterized CNCs. The obtained experimental data have been analyzed by using various electrokinetic equations. Our analytical results suggested that Smoluchowski's equation and the Ohshima–Henry equation overestimated the magnitude of the mobility of CNCs because it ignores the double layer relaxation and end effect. They also suggested that neither the Ohshima–Overbeek averaged equation nor the Ohshima–Overbeek perpendicular equation described the mobility of CNCs appropriately because those equations consider the double layer relaxation and end effect of a cylinder in a limited manner. Instead, the modified Ohshima–Overbeek equation was presented to be preferred for such a charged cylinder with a small aspect ratio.
PY - 2019
LA -
DA - 2019-10-22
VL - v. 9
IS - no. 58
SP - pp. 34032-34038
DO - 10.1039/c9ra05156b
ER -