权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Relationship between surface friction property and surface structure investigated by surface vibration spectroscopy

表面振动光谱研究表面摩擦特性与表面结构的关系

基本信息

批准号：
17550121
负责人：
YE Shen
金额：
$ 2.3万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17550121/
关键词：
Polymer surface structure Surface physical property Surface vibration spectroscopy Molecular structure at interface Surface biocompatibility Sum frequency generation (SFG)Water Interface

项目摘要

Physical properties and functionalities of soft materials such as polymer and LB films are significantly dependent on their surface/interface molecular structures. Our researches focus upon exploring the molecular structures on the surface and/or interface of the functional organic thin films, by a surface-sensitive non-linear optical vibration spectroscopy, sum frequency generation (SFG), while such structural information is hard to be obtained by the conventional vibration spectroscopy such as infrared (IR) absorption and Raman scattering.The present research is mainly focused on (1) poly(acrylate) and their co-polymer thin films, (2) polyimide thin films and (3) LB multilayer thin films, in different environments. It is clearly found that most of these polymer materials have ordered structures on the surface although their bulk structures are completely random. The surface structures can be associated with their surface properties. For example, when the poly(2-methoxyethyl acrylate) (PMEA) was immersed into water, a hydrogen bonding between carbonyl group and water molecule was only observed on its surface but not in its bulk. This kind of hydrogen bonding was hard to observe in other poly(acrylate)s and therefore, is expected to related with PMEA's excellent biocompatibility. On the other hand, the surface structures of the poly(acrylate)s are almost identical after rubbing treatment. This is in contrast with polyimide films. A large anisotropic structural feature was observed on the polyimide surface after simple rubbing treatment. The rubbing-induced surface reorientation is dependent on the function groups and π-π stacking of the polyimide. Detailed structural changes on the polyimide surface were analyzed from the SFG results. Furthermore, SFG measurements were also carried out to probe the structure on the any layer-layer interface in a multilayer LB film based on a theoretical model developed by our group recently.

软质材料如聚合物和LB膜的物理性能和功能性显著依赖于它们的表面/界面分子结构。我们的研究重点是探索功能有机薄膜的表面和/或界面上的分子结构，通过表面敏感的非线性光学振动光谱，和频产生（SFG），而这些结构信息很难通过常规的振动光谱如红外（IR）吸收和拉曼散射获得（丙烯酸酯）及其共聚物薄膜、（2）聚酰亚胺薄膜和（3）LB多层膜。研究发现，尽管这些高分子材料的整体结构是完全无规的，但它们的表面大多具有有序结构。表面结构可以与它们的表面性质相关联。例如，当将聚（2-甲氧基乙基丙烯酸酯）（PMEA）浸入水中时，仅在其表面而不是在其本体中观察到羰基与水分子之间的氢键。这种氢键在其他聚丙烯酸酯中很难观察到，因此，预计与PMEA优异的生物相容性有关。另一方面，摩擦处理后的聚丙烯酸酯的表面结构几乎相同。这与聚酰亚胺薄膜相反。经过简单的摩擦处理后，在聚酰亚胺表面观察到了很大的各向异性结构特征。摩擦诱导的表面重取向依赖于聚酰亚胺的官能团和π-π堆积。从SFG结果分析了聚酰亚胺表面上的详细结构变化。此外，基于本课题组最近发展的理论模型，我们还对多层LB膜中任意层-层界面的结构进行了SFG测量。

项目成果

期刊论文数量（15）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Hydrogen bonding effects on the surface structure and photoelectrochemical properties of nanostructured SnO2 electrodes modified with porphyrin and fullerene composites.

DOI：
10.1021/jp0537409
发表时间：
2005-09
期刊：
The journal of physical chemistry. B
影响因子：
0
作者：
H. Imahori;Jia‐cheng Liu;H. Hotta;Aiko Kira;T. Umeyama;Y. Matano;Guifeng Li;S. Ye;Marja Isosomppi;N. Tkachenko;H. Lemmetyinen
通讯作者：
H. Imahori;Jia‐cheng Liu;H. Hotta;Aiko Kira;T. Umeyama;Y. Matano;Guifeng Li;S. Ye;Marja Isosomppi;N. Tkachenko;H. Lemmetyinen

Frequency Generation from Langmuir Blodgett Multilayer Films on Metal and Dielectric Substrates

金属和介电基板上的 Langmuir Blodgett 多层薄膜产生频率