Direct Measurement of Acid-Base Interaction Energy at Solid Interfaces

被引:38
|
作者
Kurian, Anish [1 ]
Prasad, Shishir [2 ]
Dhinojwala, Ali [1 ]
机构
[1] Univ Akron, Dept Polymer Sci, Akron, OH 44325 USA
[2] Universal Technol Corp, Dayton, OH 45432 USA
基金
美国国家科学基金会;
关键词
VIBRATIONAL SPECTROSCOPY; FREQUENCY; SHIFT; WATER; SURFACES;
D O I
10.1021/la103591f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We have studied acid-base interactions at solid-liquid and solid-solid interfaces using interface-sensitive sum frequency generation (SFG) spectroscopy. The shift of the sapphire hydroxyl peak in contact with several polar and nonpolar liquids and polymers was used to determine the interaction energy. The trend in the interaction energies cannot be explained by measuring only water contact angles. Molecular rearrangements at the sapphire interface, to maximize the interaction of the acid-base groups, play a dominant role, and these effects are not accounted for in the current theoretical models. These results provide important insights into understanding adhesion, friction, and wetting on solid interfaces.
引用
收藏
页码:17804 / 17807
页数:4
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