无机盐对木质素磺酸钠静电逐层自组装的影响  

Effect of Inorganic Salts on Electrostatic Layer-by-Layer Self-Assembly of Lignosulfonate

作　　者：邓永红[1] 吴渊[1] 冯鑫佳[1] 欧阳新平[1] 杨东杰[1] 邱学青[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2010年第11期74-79,116,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家杰出青年科学基金资助项目(20925622);国家自然科学基金资助项目(20976064);广东省科技计划项目(2009B050600004)

摘　　要：将加有盐的木质素磺酸钠(SL)和聚二烯丙基二甲基氯化铵(PDAC)通过静电逐层自组装制备成木质素多层膜,研究了无机盐对SL/PDAC静电逐层自组装的影响.SL/PDAC自组装过程用紫外-可见分光光度计来监控,自组装膜表面形貌用原子力显微镜(AFM)来表征.结果表明:SL浸渍溶液中的离子强度和盐种类对自组装过程中SL的吸附特征产生重要影响.当所加盐是NaCl时,在所研究的离子强度范围内,随离子强度增加,自组装膜中SL的吸附量增大,吸附速率减慢,自组装膜表面粗糙度增加.相同离子强度下,当所加盐分别为LiCl、NaCl、KCl时,SL的吸附量随阳离子半径增大而依次增大;当所加盐分别为NaCl、NaBr、NaI时,SL的吸附量随阴离子半径增大而依次减少.Lignin multilayer films were fabricated from salt-added lignosulfonate（SL） and poly（diallyldimethylammonium chloride）（PDAC） by the electrostatic layer-by-layer self-assembly,and the effect of salt on the SL/PDAC self-assembly was studied in this work.The self-assembly process was monitored by means of UV-vis spectroscopy,and the surface morphology of the films was observed via AFM.The results show that both the ionic strength and the salt species of the SL dipping solutions greatly influence the adsorption characteristics of SL during SL/PDAC self-assembly.When NaCl is added,the adsorbed amount of SL increases,the adsorption rate reduces,and the surface roughness of the SL/PDAC self-assembled films increases with the increase ionic strength in the investigated range.At the same ionic strength,the adsorbed amount of SL increases with the cation radius when LiCl,NaCl or KCl is added,while it decreases with the increase anion radius when NaCl,NaBr or NaI is added.

关 键 词：离子强度 无机盐 木质素磺酸钠 吸附 自组装 

分 类 号：TQ423[化学工程] TQ351