液界面的扩张粘弹性.pdf

物理化学学报( ali Huaue Xuebao
Acta Phys.- Chim..、Sin.2016,32(5),1227-1235
Article]
doi:10.3866PKU.WHXB201602223
www.whxb.pku.edu.cn
咪唑基表面活性离子液体在气/液界面的扩张粘弹性
李燕柴金岭
山东师范大学化学化工与材料科学学院,山东高校化学成像功能探针协同创新中心,济南25004)
摘要:合成了两种咪唑基表面活性离子液体,通过界面膨胀流变法研究了其在气/液界面的聚集行为,考察
了咪唑基表面活性离子液体浓度、无机盐和温度对聚集行为的影响。研究发现,咪唑基表面活性离子液体在
吸附过程中吸附控制占主导作用,而弛豫过程不是单一指数函数;加入无机盐或升高温度可以提高咪唑基表
面活性离子液体的表面活性、增强其在界面的吸附能力、降低表面张力。扩张流变结果显示扩张模量、弹性
模量和粘性模量随震荡频率增加而增加;随表面活性离子液体浓度增大,扩张模量先増大后减小。扩张模量
随温度升高或无机盐(NaBr或 Cabr?)的加入而降低。表面活性离子液在气/液界面形成的吸附膜以弹性模量为
主,而且 C14mim Br l的界面膜弹性模量大予 Cmmimbr的界面膜弹性模量。
关鍵词:吸附动力学;扩张模量;气液界面;咪唑基表面活性离子液体
中图分类号:O647
Dilational Viscoelasticity of Imidazole-based Surface Active lonic
Liquids at the Air/Water Interface
LI Yan CHAI Jin-ling
(Collaborative Innovation Center of Functionalized Probes for hemical Imaging in Universities of Shandong, College of
Chemistry, Chemical Engineering and Materials cience, handon Normal University, inan 250014, P R. China)
Asac mi z at q mm es zed, and their aggregation
behavior at the airwater interface was studied via an oscillating bubble method. The effects of the Cmimbr
concentration orani salts(Nabr an a and temperature on the aggregation behavior were investigate
The results of the adsorption dynamics showed that the adsorption-controlled process dominated, but the
elaxation process was not purely mono-exponential. The addition of inorganic salt or increase in temperature
m d the surace activiy of the mmr and owered the namic surface tension. The dilational rhelogical
results revealed that the dilational modulus, elastic modules, and Viscous modules increased with increasing
oscillatin ue es, an te modulus reached a maximum value with increasing Cmimbr concentration
Increasin te temperature or adding inorganic salts(Nabr or CAB ) decreased the dilational modulus. The
elastic molus was mi r e mimbr la er an the elastic modulus of C amimbr was larger than that
f C
Key Words: Adsorption ynamics Dilational modulus; Air/water interface
Imidazole-based surface active ionic liquid
Introduction
(or organic)anion, possess many excellent properties, such as
Tonic liquids (Ls) composed of organic cation and inorganic designability, ne ble vapor pressure, low melting point, wide
Received: December 7, 2015; Revised: February 19, 2016; Published on Web: February 22, 2016
Correspondingauthor.Email:jlchai@sdn.edu.cn;Tel:+86-531-86180743
The project was supported by the National Natural Science Foundation of China(2130609, 21476133)and Science and Technology Plan Project of
Shandong Provincial University, China (12LA02
国家自然科学基金(21306092,21476133)和山东省高校科技计划(丁12LA02)资助项目
C Editorial office of Acta Physico-chimica Sinica