CONTROL OF THE SHAPE OF LIQUID LENSES ON A MODIFIED GOLD SURFACE USING AN APPLIED ELECTRICAL POTENTIAL ACROSS A SELF-ASSEMBLED MONOLAYER

被引：118
作者：
GORMAN, CB [1 ]
BIEBUYCK, HA [1 ]
WHITESIDES, GM [1 ]
机构：
[1] HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138
来源：
LANGMUIR | 1995年 / 11卷 / 06期
关键词：
D O I：
10.1021/la00006a063
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Electrochemical desorption of a patterned, self-assembled monolayer (SAM) of an organothiol on a gold surface can be used to control the shape of drops of liquid hexadecanethiol (HDT) on the surface. The contact angle of HPT drops on a thin, transparent film of gold (100 Angstrom thick) under an aqueous electrolyte solution could be varied from 128 +/- 2 degrees when the gold was held at -1.7 V (vs Ag pseudoreference) to 37 +/- 2 degrees when the gold was held at 0.0 V. Switching between these two limiting contact angles could be performed rapidly, reversibly, and reproducibly using this system. These drops could act as lenses and could be used as an optical switch which focuses/defocuses light. An array of 1-nL drops could be formed by differential wetting of a gold surface patterned with methyl- and carboxylic acid-terminated organothiol, and the contact angles of drops in this array could be switched in ca. 50 ms. Alternatively, drops could be confined to an array of gold pads on a conducting glass and switched in a similar fashion.
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页码：2242 / 2246
页数：5
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