刚性二苯乙烯衍生物的自组装单层膜的光响应性
发布时间：2018-08-07 07:18
【摘要】：刺激响应性表面可以在外界刺激下改变表面宏观性质（比如润湿性、粘附性、粗糙度、生物相容性）。不同类型的外界刺激（包括热、光、pH、电和化学添加剂等）可以被应用到这些表面上。这些刺激中，光可以提供一个清洁、非侵入的、可调节的能量输入，并且具有光化学反应的响应时间短的特点，从而引起越来越多的关注。控制润湿性可以通过对表面进行化学修饰从而改变液体对表面的亲和力。光控分子开关对制备润湿性可控的表面提供了一个新的途径。关于光控分子开关修饰的表面的润湿性研究中，提出了很多增大偶氮苯/螺吡喃不同构型修饰的表面润湿性差别的方法，比如混合膜、增加表面粗糙度以及使用聚合物修饰的表面。但是，控制平滑表面上的光响应自组装单层膜的润湿性仍然是个挑战。 刚性二苯乙烯是一个光响应基团，具有热稳定性好、异构体构型差异大、平面性好等特点。基于刚性二苯乙烯的光响应性我们设计合成了分子S5，顺式和反式S5自组装单层膜水接触角分别为67.8°和66.3°，差别很小。为了增大顺式和反式刚性二苯乙烯衍生物自组装单层膜润湿性的差别，在S5的基础上接上脲基乙酸，合成分子S7。顺式和反式S7自组装单层膜水接触角分别为63.8°和56.4°，差值为7.4°，我们得到了在不同构型下润湿性不同的自组装单层膜。其中，顺式S7自组装单层膜经光照后水接触角无明显变化，可能是因为S7没有足够大的空间发生异构。为了减小空间阻碍，，制备了顺式S7/正丁硫醇混合自组装单层膜，水接触角为70.8°。经392nm光照后，水接触角减小到60.4°；再经过352nm光照后，水接触角与352nm光照前相比无明显变化，因此，顺式S7/正丁硫醇混合自组装单层膜是一个具有单向光响应性的薄膜。
[Abstract]:Stimulative responsive surfaces can change the macroscopic properties of surfaces under external stimulation (e. G. Wettability, adhesion, roughness, biocompatibility). Different types of external stimuli (including heat, light pH, electrical and chemical additives, etc.) can be applied to these surfaces. Among these stimuli, light can provide a clean, non-invasive, adjustable energy input, and has the characteristics of short response time of photochemical reaction, which has attracted more and more attention. Controlling wettability can change the affinity of liquid to the surface by modifying the surface chemically. Optically controlled molecular switches provide a new way to prepare wettability controllable surfaces. In the study of the wettability of the surface modified by optically controlled molecular switches, many methods have been proposed to increase the wettability of the surface modified by azobenzene / spiropyran, such as the mixed film. Increase surface roughness and use polymer modified surfaces. However, controlling the wettability of self-assembled monolayers on smooth surfaces remains a challenge. Rigid stilbene is a photo-responsive group with good thermal stability, great difference in the configuration of isomers and good planarity. Based on the photoresponse of rigid stilbene, the water contact angles of S5, cis-and trans-S5 self-assembled monolayers were 67.8 掳and 66.3 掳, respectively. In order to increase the wettability of self-assembled monolayers of cis and trans rigid stilbene derivatives, the synthesis molecule S7 was synthesized by adding urea acetic acid on the basis of S5. The water contact angles of cis-and trans-S7 self-assembled monolayers are 63.8 掳and 56.4 掳, respectively, and the difference is 7.4 掳. We have obtained self-assembled monolayers with different wettability under different configurations. The water contact angle of Cis-S7 self-assembled monolayer film does not change obviously after illumination, which may be due to the isomerism of S7. In order to reduce the space barrier, a cis S7 / n-butyl mercaptan mixed self-assembled monolayer was prepared with a water contact angle of 70.8 掳. After 392nm illumination, the water contact angle decreased to 60.4 掳, and after 352nm illumination, the water contact angle did not change significantly compared with that before 352nm illumination. Therefore, the cis-S _ 7 / n-butyl mercaptan mixed self-assembled monolayer was a unidirectional photo-responsive film.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O625.12;TB383.2
本文编号：2169278
[Abstract]:Stimulative responsive surfaces can change the macroscopic properties of surfaces under external stimulation (e. G. Wettability, adhesion, roughness, biocompatibility). Different types of external stimuli (including heat, light pH, electrical and chemical additives, etc.) can be applied to these surfaces. Among these stimuli, light can provide a clean, non-invasive, adjustable energy input, and has the characteristics of short response time of photochemical reaction, which has attracted more and more attention. Controlling wettability can change the affinity of liquid to the surface by modifying the surface chemically. Optically controlled molecular switches provide a new way to prepare wettability controllable surfaces. In the study of the wettability of the surface modified by optically controlled molecular switches, many methods have been proposed to increase the wettability of the surface modified by azobenzene / spiropyran, such as the mixed film. Increase surface roughness and use polymer modified surfaces. However, controlling the wettability of self-assembled monolayers on smooth surfaces remains a challenge. Rigid stilbene is a photo-responsive group with good thermal stability, great difference in the configuration of isomers and good planarity. Based on the photoresponse of rigid stilbene, the water contact angles of S5, cis-and trans-S5 self-assembled monolayers were 67.8 掳and 66.3 掳, respectively. In order to increase the wettability of self-assembled monolayers of cis and trans rigid stilbene derivatives, the synthesis molecule S7 was synthesized by adding urea acetic acid on the basis of S5. The water contact angles of cis-and trans-S7 self-assembled monolayers are 63.8 掳and 56.4 掳, respectively, and the difference is 7.4 掳. We have obtained self-assembled monolayers with different wettability under different configurations. The water contact angle of Cis-S7 self-assembled monolayer film does not change obviously after illumination, which may be due to the isomerism of S7. In order to reduce the space barrier, a cis S7 / n-butyl mercaptan mixed self-assembled monolayer was prepared with a water contact angle of 70.8 掳. After 392nm illumination, the water contact angle decreased to 60.4 掳, and after 352nm illumination, the water contact angle did not change significantly compared with that before 352nm illumination. Therefore, the cis-S _ 7 / n-butyl mercaptan mixed self-assembled monolayer was a unidirectional photo-responsive film.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O625.12;TB383.2
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本文编号：2169278
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