Droplet array chips were realized using an alignment-free fabrication process in silicon. The chips were textured with a homogeneous nano-scale surface roughness but were partially covered with a self-assembled monolayer of perfluorodecyltrichlorosilane (FDTS), resulting in a super-biphilic surface. When submerged in water and withdrawn again, microliter sized droplets are formed due to pinning of water on the hydrophilic spots. The entrained droplet volumes were investigated under variation of spot size and withdrawal velocity. Two regimes of droplet formation were revealed: at low speeds, the droplet volume achieved finite values even for vanishing speeds, while at higher speeds the volume was governed by fluid inertia. A simple 2D boundary layer model describes the behavior at high speeds well. Entrained droplet volume could be altered, post-fabrication, by more than a factor of 15, which opens up for more applications of the dip-coating technique due to the significant increase in versatility of the micro-droplet array platform.

中文翻译：

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通过双亲表面浸涂产生微滴阵列；夹带的液滴体积对抽出速度的依赖性。

液滴阵列芯片是使用硅中的无对准制造工艺实现的。芯片的纹理具有均匀的纳米级表面粗糙度，但部分覆盖有全氟癸基三氯硅烷（FDTS）的自组装单层，从而形成了超双亲表面。当浸入水中并再次抽出时，由于水会钉在亲水性斑点上，因此会形成微升大小的液滴。在点尺寸和撤出速度的变化下研究了夹带的液滴体积。揭示了两种液滴形成方式：在低速下，即使对于消失速度，液滴体积也达到有限值，而在较高速度下，液滴的体积由流体惯性控制。一个简单的2D边界层模型很好地描述了高速下的行为。夹带的液滴体积可能会改变，