Surface-directed liquid flow inside microchannels
Surface-directed liquid flow inside microchannels
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DOI：
10.1126/science.291.5506.1023
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发表时间：
2001-02-09
期刊：
影响因子：
56.9
通讯作者：
Beebe, DJ
中科院分区：
文献类型：
--
作者：
Zhao, B;Moore, JS;Beebe, DJ
自组装单层化学与多流层流或光刻结合使用，以图案化微通道网络内的表面自由能。如果压力保持在临界值以下，则引入到这些图案化通道中的水性液体被限制在亲水性路径中。最大压力由液体的表面自由能、液体在疏水区域上的前进接触角和通道深度决定。表面导向的液体流动被用于在通道网络内部创建压敏开关。将液体流动限制在仅具有两个物理壁的微通道内的能力预期在大的气-液界面是关键的应用中是有用的，如这里通过气-液反应所证明的。
Self-assembled monolayer chemistry was used in combination with either multistream laminar flow or photolithography to pattern surface free energies inside microchannel networks. Aqueous Liquids introduced into these patterned channels are confined to the hydrophilic pathways, provided the pressure is maintained below a critical value. The maximum pressure is determined by the surface free energy of the liquid, the advancing contact angle of the Liquid on the hydrophobic regions, and the channel depth. Surface-directed liquid flow was used to create pressure-sensitive switches inside channel networks. The ability to confine Liquid flow inside microchannels with only two physical walls is expected to be useful in applications where a Large gas-liquid interface is critical, as demonstrated here by a gas-liquid reaction.