表面活性剂分散多壁碳纳米管机理及性能评价  

Surfactant-assisted multi-walled carbon nanotubes dispersion:Mechanism and properties evaluation

作　　者：陈泽宇 刘静[1,2,3] 蒲春生[1,2,3] 李旭 白云[1,2,3] CHEN Zeyu;LIU Jing;PU Chunsheng;LI Xu;BAI Yun(College of Petroleum Engineering,China University of Petroleum,Qingdao 266580,Shandong,China;Key Laboratory of Unconventional Oil&Gas Development,China University of Petroleum,Qingdao 266580,Shandong,China;Shandong Key Laboratory of Oilfield Chemistry,Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油大学(华东)非常规油气开发教育部重点实验室,山东青岛266580 [3]山东省油田化学省级重点实验室,山东青岛266580

出　　处：《精细化工》2022年第2期269-275,410,共8页Fine Chemicals

基　　金：国家重点研发计划资助(2020YFA0711800)。

摘　　要：十二烷基硫酸钠(SDS)、十六烷基三甲基溴化铵(CTAB)、壬基酚醚璜基琥珀酸单酯二钠盐(HT A-103)、辛基酚聚氧乙烯醚(OP-10)分别与质量分数为0.1%的多壁碳纳米管(MWCNTs)复配,制备出4种表面活性剂-MWCNTs分散体系。利用UV-Vis光谱、Zeta电位及SEM对其分散性进行了评价,分析了各类表面活性剂在MWCNTs表面的吸附方式以及对分散性能的作用机理和影响规律。结果表明,SDS、CTAB、HT A-103、OP-10质量分数分别在0.30%、0.04%、0.025%、0.06%时体系达到最佳分散效果,分散性能顺序为:CTAB>HT A-103>OP-10>SDS,各体系分散性均随表面活性剂质量分数的升高先增大后减小;CTAB在静电引力、疏水力及范德华力作用下形成双层吸附紧密吸附包裹在MWCNTs表面,表面电势与空间位阻均高于其他3种体系;与SDS相比,HT A-103可赋予MWCNTs更高的表面电势,同时凭借苯环与MWCNTs间的π-π作用增强了吸附性能。Sodium dodecyl sulfate(SDS),cetyl trimethyl ammonium bromide(CTAB),nonylphenol ether sulfosuccinate monoester disodium salt(HT A-103)and octaphenyl polyoxyethyiene(OP-10)were compounded with mass fraction of 0.1%of multi-walled carbon nanotubes(MWCNTs)to prepare four kinds of dispersions,respectively.The dispersing properties were evaluated by UV-Vis adsorption spectrum,Zeta potential and SEM.The adsorption modes of different surfactants on the surface of MWCNTs and their effect on dispersion properties were analyzed.The results showed that the best dispersion effect of MWCNTs system was achieved mass fractions of SDS,CTAB,HT A-103 and OP-10 at 0.30%,0.04%,0.025%,0.06%,respectively.The order of dispersibility of surfactants-modified MWCNTs was:CTAB>HT A-103>OP-10>SDS.The dispersibility of all systems first increased and then decreased with the increase of mass fraction of surfactant.Both surface potential and steric hindrance of CTAB-assitied MWCNTs system were higher than those of the other systems,which was attributed to that CTAB molecules could form a double layer adsorption on the MWCNTs through electrostatic force,Van der Waals force,and hydrophobic force.Compared with SDS,HT A-103 could endow MWCNTs with a higher surface potential,and enhance the adsorption properties by virtue of theπ-πinteraction between benzene ring and MWCNTs.

关 键 词：多壁碳纳米管 表面活性剂 分散 吸附 团聚 功能材料 

分 类 号：TB383[一般工业技术—材料科学与工程] TQ127.1[化学工程—无机化工]