| Correlation between the Structure and Wettability of Photoswitchable Hydrophilic Azobenzene Monolayers on Silicon | |
| Department | 固体润滑国家重点实验室 |
Pei XW(裴小维) ; Antony Fernandes; Bertrand Mathy; Xavier Laloyaux; Bernard Nysten; Olivier Riant; Alain M. Jonas
| |
| 2011 | |
| Source Publication | langmuir
 |
| ISSN | 0743-7463 |
| Volume | 27Pages:9403-9412 |
| Abstract | Photoresponsive monolayers of hydrophilically substituted azobenzenes have been prepared by reaction on aminosilane monolayers on silicon surfaces. Grafting densities in the 0.2 1.0 molecule/nm2 range were determined by X-ray reflectometry. The monolayers exhibit reversible photoisomeri- zation, switching from a more hydrophilic trans state to a less hydrophilic cis state upon UV irradiation, in contrast with the usual behavior ofmost azobenzenemonolayers that switch from a less to a more hydrophilic state. This indicates that the wettability is not dominated by the change in the dipole moment of the azobenzene moiety but originates from variations in the composi- tion of the outer surface of the monolayers resulting from the reorientation of the substituent groups.The light-driven change in thewater contact angle correlates linearlywith the grafting density but remains small. However, the wettability contrast can be increased by forcing the molecules to stand in an improved vertical orientation, either by densifying the underlying aminosilane monolayer or by filling the voids left at the bottom of the layer of grafted azobenzene molecules. |
| Subject Area | 材料科学与物理化学 |
| Funding Organization | the Communaut e Francaise de Belgique (ARC 06-11/339);the Belgian Federal Science Policy (IAP-PAI P6/27);the F.R.S.-FNRS;the Wallonia Region (Nanotic-Feeling) |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/779 |
| Collection | 固体润滑国家重点实验室（LSL） |
| Corresponding Author | Alain M. Jonas |
| Recommended Citation GB/T 7714 | Pei XW,Antony Fernandes,Bertrand Mathy,et al. Correlation between the Structure and Wettability of Photoswitchable Hydrophilic Azobenzene Monolayers on Silicon[J]. langmuir,2011,27:9403-9412. |
| APA | 裴小维.,Antony Fernandes.,Bertrand Mathy.,Xavier Laloyaux.,Bernard Nysten.,...&Alain M. Jonas.(2011).Correlation between the Structure and Wettability of Photoswitchable Hydrophilic Azobenzene Monolayers on Silicon.langmuir,27,9403-9412. |
| MLA | 裴小维,et al."Correlation between the Structure and Wettability of Photoswitchable Hydrophilic Azobenzene Monolayers on Silicon".langmuir 27(2011):9403-9412. |
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