硝酸对AlOOH溶胶流变特性的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (11): 3756-3761.

硝酸对AlOOH溶胶流变特性的影响

张湘泰¹, 段宁¹, 陆成龙^1,2, 张银凤^1,2, 李崇瑞¹

1.武汉科技大学资源与环境工程学院,武汉 430081;
2.湖北理工学院,矿区环境污染控制与修复湖北省重点实验室,黄石 435003

收稿日期:2021-06-14 修回日期:2021-07-16 出版日期:2021-11-15 发布日期:2021-12-08
通讯作者: 陆成龙,博士,讲师。E-mail:cjwust@126.com
作者简介:张湘泰(1996—),男,硕士研究生。主要从事水处理陶瓷材料方向的研究。E-mail:zhangxiangtai@sina.cn
基金资助:
矿区环境污染控制与修复湖北省重点实验室开放基金(2019106)

Influence of HNO₃ on Rheological Properties of AlOOH Sol

ZHANG Xiangtai¹, DUAN Ning¹, LU Chenglong^1,2, ZHANG Yinfeng^1,2, LI Chongrui¹

1. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003, China

Received:2021-06-14 Revised:2021-07-16 Online:2021-11-15 Published:2021-12-08

摘要/Abstract

摘要： 为控制氧化铝陶瓷膜制备中的涂膜工艺,以异丙醇铝为原料,硝酸为胶溶剂,制备了AlOOH溶胶。通过旋转流变仪、Zeta电位分析仪等表征手段,研究了硝酸用量对AlOOH溶胶流变特性的影响。结果表明,硝酸与异丙醇铝摩尔比R(n(HNO₃):n(Al(C₃H₇O₃)₃))为0.3~0.6时,AlOOH溶胶表现出假塑性流体特征。通过Herschel-Bulkley模型拟合流变测试数据得到的流动指数随着R的增大而减小,稠度系数随之增大;振幅扫描中储能模量(G′)与损耗模量(G″)均随着R增大而上升;频率扫描中G′与G″的交点随着R的增大而逐渐靠近低频。随着R的增大,AlOOH溶胶假塑性增强,稠度增大,弹性与黏性均上升,更易转变为凝胶。当R≥0.7时已经转化为凝胶,不再符合流体规律。Zeta电位的高低影响AlOOH溶胶的分散性,进而影响上述现象。

关键词: 陶瓷膜, AlOOH溶胶, 硝酸, 异丙醇铝, 流变特性, Zeta电位

Abstract: In order to control the coating process in the preparation of alumina ceramic membrane, AlOOH sol was prepared by using aluminum isopropoxide as the raw material and HNO₃ as the peptizer. The influence of the amount of HNO₃ on the rheological properties of AlOOH sol was studied through rotational rheometer and Zeta potential measurement. The results show that when the molar ratio of HNO₃ to aluminum isopropoxide R(n(HNO₃):n(Al(C₃H₇O₃)₃)) is in the range of 0.3 to 0.6, AlOOH sol exhibits pseudoplastic fluid characteristics. The Herschel-Bulkley model was used to fit the rheological test data. As R increases, the fluid index (n) decreases, while the consistency coefficient (k_HB) increases. The storage modulus (G′) and loss modulus (G″) increase with the increase of R. The intersection of G′ and G″ in the frequency sweep gradually approaches the low frequency with the increase of R. With the increase of R, the pseudoplasticity of AlOOH sol increases, the consistency increases, the elasticity and viscosity both increase, and it is easier to gelation. While R is above 0.7, it has been transformed into a gel, which does not conform to the fluid law. The level of the Zeta potential affects the dispersibility of the AlOOH sol, thereby affects the above phenomenon.

Key words: ceramic membrane, AlOOH sol, HNO₃, aluminum isopropoxide, rheological property, Zeta potential

中图分类号:

TQ174

张湘泰, 段宁, 陆成龙, 张银凤, 李崇瑞. 硝酸对AlOOH溶胶流变特性的影响[J]. 硅酸盐通报, 2021, 40(11): 3756-3761.

ZHANG Xiangtai, DUAN Ning, LU Chenglong, ZHANG Yinfeng, LI Chongrui. Influence of HNO₃ on Rheological Properties of AlOOH Sol[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3756-3761.

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