Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland.
Langmuir. 2010 Jun 1;26(11):8392-9. doi: 10.1021/la904830h.
An orthogonal surface-chemical gradient composed of self-assembled monolayers on gold has been prepared by successive, controlled immersions in orthogonal directions into dilute solutions of dodecanethiol and perfluorododecanethiol. The resulting two-component orthogonal gradient in surface coverage was backfilled with 11-mercaptoundecanol, leading to a two-directional, three-component surface-chemical gradient. Water and hexadecane show distinctly different wetting behaviors on the gradient surface because of the differences in the hydrophobic and oleophobic natures of the three different constituents. These results are correlated with the chemical composition maps of the surface obtained by X-ray photoelectron spectroscopy. The homogeneity and the ordering of the self-assembled monolayer were investigated by dynamic water contact angle measurements and polarization-modulation infrared reflection-absorption spectroscopy.
已通过在正交方向上连续、受控地浸入到十二硫醇和全氟十二硫醇的稀溶液中，制备了由自组装单层组成的正交表面化学梯度。所得的表面覆盖率的两组件正交梯度用 11-巯基十一烷醇进行回填，从而形成了两向、三组分的表面化学梯度。由于三种不同成分的疏水性和疏油性性质不同，水和十六烷在梯度表面上表现出明显不同的润湿行为。这些结果与通过 X 射线光电子能谱获得的表面化学成分图谱相关联。通过动态水接触角测量和偏振调制红外反射吸收光谱研究了自组装单层的均一性和有序性。
