物理化学学报 >> 2015, Vol. 31 >> Issue (9): 1733-1740.doi: 10.3866/PKU.WHXB201508101

软物质 上一篇    下一篇

液晶/水界面上的氢键作用诱导液晶取向转变

廖芝建,秦振立,杜思南,李思雨,陈冠侯,左芳*(),罗建斌   

  • 收稿日期:2015-06-05 发布日期:2015-09-06
  • 通讯作者: 左芳 E-mail:polymerzf@swun.cn
  • 基金资助:
    国家自然科学基金(51273220);中央高校基本科研基金(11NZYQN23)

Orientational Transitions of Liquid Crystal Driven by Hydrogen-Bond Interaction at the Liquid Crystal-Aqueous Interface

Zhi-Jian. LIAO,Zhen-Li. QIN,Si-Nan. DU,Si-Yu. LI,Guan-Hou. CHEN,Fang. ZUO*(),Jian-Bin. LUO   

  • Received:2015-06-05 Published:2015-09-06
  • Contact: Fang. ZUO E-mail:polymerzf@swun.cn
  • Supported by:
    the National Natural Science Foundation of China(51273220);Fundamental Research Funds for the CentralUniversities, China(11NZYQN23)

摘要:

本文提出液晶/水界面上氢键作用可以诱导热致型液晶(戊基联苯氰,简称: 5CB)发生取向转变.当液晶5CB膜接触酚类(如对硝基苯酚)水溶液的时候,由于酚类物质的酚羟基与液晶5CB分子中的氰基在液晶水界面上形成了氢键,在氢键的作用下使得液晶5CB由平行取向转变成了垂直取向.此外,还利用了液晶传感器可视化了酚类物质与牛血清蛋白(BSA)之间的相互作用.本文的研究结果可为研究液晶/水界面上的界面现象提供新的思路,并且有望开发出基于氢键作用的液晶生物化学传感技术.

关键词: 液晶, 氢键作用, 取向转变, 界面现象, 光学响应, 酚类, 牛血清蛋白

Abstract:

In this paper, an orientational anchoring transition of the thermotropic nematic liquid crystal (LC) (4-cyano-4'-pentylbiphenyl (5CB)) driven by hydrogen-bond (HB) interaction at the LC-aqueous interface is presented. After a 5CB film is introduced onto an aqueous solution of phenols such as nitrophenol, the alignment of 5CB changes from planar to homeotropic, which is attributed to HB interaction between 5CB and phenols at the LC-aqueous interface. On the other hand, the interaction of pnitrophenol or m-nitrophenol with bovine serum albumin (BSA) is imaged by the LC sensor. Overall, the results provide new insight into interfacial phenomena occurring at the LC-aqueous interface, and hold the potential for biological and chemical sensing techniques based on HB interaction.

Key words: Liquid crystal, Hydrogen-bond interaction, Orientational transition, Interfacial phenomenon, Optical response, Phenols, Bovine serum albumin

MSC2000: 

  • O647