Spatial Site-Patterning of Wettability in a Microcapillary Tube

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• 作者：Yali Zhang ; Jan W. van Nieuwkasteele ; Meng Qiang ; Peichun Amy Tsai ; Rob G.H. Lammertink
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：8
• 期：17
• 页码：10657-10660
• 全文大小：259K
• 年卷期：0
• ISSN：1944-8252

文摘

Substrate functionalization is of great importance in successfully manipulating flows and liquid interfaces in microdevices. Herein, we propose an alternative approach for spatial patterning of wettability in a microcapillary tube. The method combines a photolithography process with self-assembled monolayer formation. The modified microcapillaries show very sharp boundaries between the alternating hydrophilic/hydrophobic segments with an achieved smallest domain dimension down to 60 μm inside a 580 μm inner diameter capillary. Our two-step method allows us to pattern multiple types of functional groups in an enclosed channel. Such structures are promising regarding the manipulation of segmented flows inside capillaries.