文献类型：期刊文献

中文题名：SiO_2微球表面吸附PDADMAC的研究

英文题名：Characterization of the Adsorption of PDADMAC on SiO_2 Microspheres

作者：朱以华[1];答鸿[1];杨晓玲[1];胡英[2]

机构：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237;[2]华东理工大学化学系,上海200237

年份：2004

卷号：17

期号：6

起止页码：775

中文期刊名：Chinese Journal of Chemical Physics

外文期刊名：化学物理学报（英文）

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina (2 0 2 76 0 19) .

语种：中文

中文关键词：SiO2;聚电解质;Zeta电位;吸附;XPS分析

外文关键词：SiO_2, Polyelectrolyte, Zeta potential, Adsorption, XPS analysis

摘要：研究了SiO2 微球表面吸附聚阳离子电解质聚二烯丙基二甲基氯化铵PDADMAC的吸附等温线分别随溶液NaCl浓度、pH值和温度的变化趋势 ,以及不同 pH值下的Zeta电位 .测试结果表明 ,聚电解质在SiO2 微球表面的吸附分别随盐浓度和pH值的增加而增加 ,该吸附属于Langmuir型 .随着PDADMAC吸附量的增加 ,SiO2微球的等电点逐渐向碱性范围移动 .在碱性条件下 ,吸附PDADMAC的SiO2 微球显示良好的分散稳定性 .XPS分析显示 ,SiO2 微球表面吸附PDADMAC后含氮 ,其N1s结合能为 4 0 1.7eV .O1s谱含两个峰 ,分别对应低结合能的SiO2 结构氧和高结合能的吸附氧 .当SiO2 微球表面吸附PDADMAC后吸附氧部分的O1s峰增加 .
The effects of concentration of NaCl and pH values on the adsorption isotherms of poly(diallyldimethylammonium chloride) (PDADMAC) on SiO_2 microspheres and Zeta-potential of adsorbed-silica in different pH- buffer have been investigated. The results show that the adsorption of the polyelectrolyte increases with increasing salt concentration and pH values, respectively. It follows the Langmiur isotherm. The isoelectric point of SiO_2 microspheres gradually migrates toward the high pH values with increasing the adsorption of PDADMAC. Under alkaline conditions the PDADMAC adsorption on SiO_2 microspheres shows good stability of disperse. The X-ray photoelectron spectroscopy (XPS) analysis of the PDADMAC adsorpted SiO_2 microspheres sample exhibits the presence of nitrogen-containing intermediates with N1s XPS peaks at the binding energy of 401.7 eV. The O1s spectra show two distinct peaks which are oxygen-containing silica corresponding lower binding energy and adsorping oxygen corresponding higher binding energy, respectively. With the PDADMAC adsorption on SiO_2 microspheres the peak of O1s contributed from the part of adsorping oxygen increases.