摘要
在材料科学领域,颗粒的均匀分散是获得具有较好的显微结构和性能材料制品的基础。采用分光光度计法表征分散效果,研究了超声波及不同分散稳定剂复合作用下纳米SiO_2、纳米CaCO_3、纳米Al_2O_3颗粒的分散性能,并结合DLVO理论探讨了分散机理,给出了分散剂优选方案。结果表明,超声波处理纳米颗粒悬浮液可以有效打破纳米颗粒团聚;不同分散剂对不同纳米颗粒的分散效果差异较大,NS颗粒相比NC、NA更难被分散剂分散,分散剂SHMP、SDBS作用效果随用量的增大先增强后减弱,分散剂PCS作用效果随用量的增加而增强;分散剂种类、用量会影响纳米悬浮颗粒的双电层厚度和颗粒周围空间微环境,从而影响分散体系的稳定性。
In the field of materials science,the uniform dispersion of particles is the basis for obtaining the material products with better microstructure and properties.In this paper,the dispersion properties of nano-SiO2,nano-CaCO3 and nano-Al2O3 particles under the combined action of ultrasonic and different dispersion stabilizers were studied,and the dispersion effect was characterized by spectrophotometer method.The dispersion mechanism was discussed in combination with DLVO theory,and the optimal dispersant solution was given.The results show that the ultrasonic can effectively break the agglomeration and different dispersants have different dispersion effects on different nano-particles,the effect of dispersant SHMP and SDBS increased first and then decreased with the increase of dosage,and the effect of dispersant PCS increased with the increase of dosage;the type and amount of dispersant will affect the double-layer thickness and the micro-environment around the particles,which will affect the stability of the dispersion.
作者
许耀群
李曙光
王娟
武霄鹏
XU Yaoqun 1,2 ,LI Shuguang 2, WANG Juan 1, WU Xiaopeng 1(1 College of Water Conservancy and Environment Engineering, Zhengzhou University, Zhengzhou 450001;2 State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 10003)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第A01期300-304,共5页
Materials Reports
基金
十三五计划(2016YFB0303601)
国家自然科学基金(51409284
51309203)
中国水利水电科学研究院流域水循环模拟与调控国家重点实验室课题(2016TS10
SKL2017CGS05
IWHR-SKL-201512)
关键词
纳米颗粒
超声波
分散剂
吸光度
胶体稳定
nano-particles
ultrasonic
dispersants
absorbance
colloidal stability
