Dispersive Ability of Carboxylated Cellulose Nanofibrils for Aqueous Monolayer Montmorillonite Dispersion:Influence of Na^(+) and Ca^(2+) Concentrations

作     者：Kaihuang Chen Chuan Sun Guanhui Li Jinhao Huang Zhiqiang Fang Xueqing Qiu Kaihuang Chen;Chuan Sun;Guanhui Li;Jinhao Huang;Zhiqiang Fang;Xueqing Qiu

作者机构：School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouGuangdong Province510640China State Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong Province510640China School of Chemical Engineering and Light IndustryGuangdong Provincial Key Laboratory of Plant Resources BiorefineryGuangdong University of TechnologyGuangzhouGuangdong Province510006China 

出 版 物：《Paper And Biomaterials》 (造纸与生物质材料（英文）)

年 卷 期：2022年第7卷第1期

页      面：28-37页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：monolayer montmorillonite carboxylated cellulose nanofibrils dispersion mechanism metal ion 

摘      要：Carboxylated cellulose nanofibrils(CNFs)have emerged as effective green dispersants for monolayer montmorillonite(MMT)***,their dispersion capability is sensitive to the metal ion concentration in aqueous ***,this study investigated the effects of Na^(+) and Ca^(2+) concentrations on the dispersive ability of carboxylated CNFs for monolayer MMTs in *** crystal microbalance with dissipation monitoring(QCM-D)and atomic force microscopy(AFM)were utilized to explore the interfacial interactions between the carboxylated CNFs and monolayer MMTs under different Na^(+) and Ca^(2+) *** the concentration of Na^(+) reached 0.1 mmol/L,the adhesion mass of carboxylated CNFs on MMT-coated wafer peaked at 24.47 mg/m^(2),higher than control sample(carboxylated CNF-dispersed monolayer MMT dispersion without metal ions,16.03 mg/m^(2)).Moreover,the electrostatic shielding effect promoted a better dispersion of monolayer MMTs by carboxylated CNF *** a further increase in the Na^(+) concentration,the surface charge of CNFs and MMTs would be reversed resulting from the improved electrostatic shielding effect,which weaken the dispersive ability of carboxylated *** addition of Ca^(2+) reduced the dispersive ability of carboxylated CNFs for monolayer MMTs,because Ca^(2+) required a lower concentration for the onset of charge reversal compared to Na^(+).This study provides interfacial scale insights into the influence of metal ion concentration on carboxylated CNF-dispersed monolayer MMT *** also provides a strategy to enhance the dispersive ability of carboxylated CNFs for monolayer MMTs.