Gleiche M, Chi LF, Fuchs H
Physikalisches Institut, Westfalische Wilhelms-Universitat, Munster, Germany.
Nature. 2000 Jan 13;403(6766):173-5. doi: 10.1038/35003149.
Engineered microscopic surface structures allow local control of physical surface properties such as adhesion, friction and wettability. These properties are related both to molecular interactions and the surface topology--for example, selective adsorption and molecular recognition capabilities require controlled anisotropy in the surface properties. Chemistry with extremely small amounts of material has become possible using liquid-guiding channels of sub-micrometre dimensions. Laterally structured surfaces with differing wettabilities may be produced using various techniques, such as microcontact printing, micromachining, photolithography and vapour deposition. Another strategy for introducing anisotropic texture is based on the use of the intrinsic material properties of stretched ultrathin polymer coatings. Here we present a fast and simple method to generate extended patterned surfaces with controlled wetting properties on the nanometre scale, without any lithographic processes. The technique utilizes wetting instabilities that occur when monomolecular layers are transferred onto a solid substrate. The modified surfaces can be used as templates for patterning a wide variety of molecules and nanoclusters into approximately parallel channels, with a spatial density of up to 20,000 cm(-1). We demonstrate the transport properties of these channels for attolitre quantities of liquid.
工程化的微观表面结构能够对诸如粘附力、摩擦力和润湿性等物理表面特性进行局部控制。这些特性既与分子相互作用有关，也与表面拓扑结构有关——例如，选择性吸附和分子识别能力要求表面特性具有可控的各向异性。利用亚微米尺寸的液体引导通道，实现极少量材料的化学操作已成为可能。可以使用各种技术，如微接触印刷、微加工、光刻和气相沉积，来制造具有不同润湿性的横向结构化表面。另一种引入各向异性纹理的策略是基于使用拉伸超薄聚合物涂层的固有材料特性。在此，我们展示了一种快速且简单的方法，无需任何光刻工艺，就能在纳米尺度上生成具有可控润湿特性的扩展图案化表面。该技术利用了单分子层转移到固体基板上时出现的润湿不稳定性。改性后的表面可用作模板，将各种分子和纳米团簇图案化成近似平行的通道，空间密度高达20,000 cm⁻¹。我们展示了这些通道对于阿升量级液体的传输特性。
