Lee Minwoo, Heo Minhaeng, Lee Hyunho, Shin Jihoon
Center for Environment & Sustainable Resources, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Korea.
Department of Advanced Materials & Chemical Engineering, University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea.
Materials (Basel). 2021 Oct 28;14(21):6463. doi: 10.3390/ma14216463.
The isolation degree of cellulose nanocrystals (CNCs) suspensions calculated from the amount of sediments obtained with the centrifugation method can be estimated with turbidimetry, surface charge and dispersion analysis of the CNCs suspension. Three different types of raw cellulosic materials were used and carried out with an acid hydrolysis and mechanical disintegration. As the number of high-pressure homogenizer treatments increased, the isolation degree of CNCs from microcrystalline cellulose (MCC) increased from 2.3 to 99.6%, while the absorbencies from turbidimetric measurement of the CNCs suspension decreased, from 2.6 to 0.1 Abs units. Furthermore, the surface charges based on zeta potential measurements of the CNCs suspensions increased from -34.6 to -98.7 mV, but the heights of sediments from the CNCs suspensions were reduced, from 4.01 to 0.07 mm. Similar results were obtained for CNCs from softwood pulp (SWP) and cotton pulp (CP). These results show a direct correlation between yield, turbidity, surface charge and sedimentation of CNCs suspensions. Their correlation indices (0.9) were close to a maximal value of 1. This approach can be suggested as a facile and rapid estimation method for CNCs manufacturing process.
通过比浊法、纤维素纳米晶体（CNCs）悬浮液的表面电荷和分散分析，可以根据离心法获得的沉积物量来估算CNCs悬浮液的分离度。使用了三种不同类型的原始纤维素材料，并进行了酸水解和机械分解。随着高压均质机处理次数的增加，从微晶纤维素（MCC）中分离出的CNCs的分离度从2.3%提高到99.6%，而CNCs悬浮液比浊测量的吸光度从2.6 Abs单位下降到0.1 Abs单位。此外，基于CNCs悬浮液zeta电位测量的表面电荷从-34.6 mV增加到-98.7 mV，但CNCs悬浮液的沉积物高度从4.01 mm降低到0.07 mm。从软木浆（SWP）和棉浆（CP）中提取的CNCs也得到了类似的结果。这些结果表明了CNCs悬浮液的产率、浊度、表面电荷和沉降之间存在直接相关性。它们的相关指数（0.9）接近最大值1。这种方法可以作为一种简便快速的CNCs制造过程估算方法。
