Rational Synthesis of Large‐Area Periodic Chemical Gradients for the Manipulation of Liquid Droplets and Gas Bubbles,Advanced Functional Materials

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Rational Synthesis of Large‐Area Periodic Chemical Gradients for the Manipulation of Liquid Droplets and Gas Bubbles
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-09 , DOI: 10.1002/adfm.201705564
Karla Perez-Toralla ₁ , Abhiteja Konda ₁ , John J. Bowen ₁ , Emily E. Jennings ₁ , Christos Argyropoulos _{2,

3} , Stephen A. Morin _{1,

3}

Affiliation

Synthetic approaches based on the patterned deposition of volatile molecules from the vapor phase are used extensively in the creation of surface‐chemical gradients; however, the ability to generate diffusion‐controlled 1D and 2D gradients from multiple sources remains a challenge. The current work reports a one‐step approach to the synthesis of continuous and periodic chemical gradients with simple and intricate geometries using multiple sources within custom reaction chambers. Specifically, this approach provides precise, simultaneous control over the physicochemical conditions (e.g., concentration, evaporation rate, and direction of diffusion flux of the chemical moieties) and the geometrical parameters (e.g., size, shape, and position) during surface functionalization, thus enabling materials with predictable surface‐chemical gradients applicable to the manipulation and/or organization of liquid droplets and that can generate assemblies of functional solids (e.g., silver nanoparticles) that are transferrable via stamping. These surfaces can be useful to various fields, for example, molecular diagnostics and microfabrication. Furthermore, this work extends the application of these surfaces to the precise placement and manipulation of gas bubbles that can have potential use in, for example, controlling bubble nucleation in processes designed to manage heat transfer.

中文翻译：

大面积周期化学梯度的合理合成，以控制液滴和气泡

基于气相中挥发性分子的图案化沉积的合成方法被广泛用于创建表面化学梯度。但是，从多个源生成扩散控制的1D和2D渐变的能力仍然是一个挑战。当前的工作报告了一种使用自定义反应室内的多种来源合成具有简单复杂几何形状的连续和周期性化学梯度的一步方法。具体而言，此方法可在表面功能化过程中，对物理化学条件（例如，化学部分的浓度，蒸发速率和扩散通量的方向）和几何参数（例如，尺寸，形状和位置）进行精确，同时的控制，从而使材料具有可预测的表面化学梯度，适用于液滴的操作和/或组织，并且可以生成可通过压印转移的功能性固体（例如，银纳米颗粒）的集合体。这些表面可用于各种领域，例如分子诊断和微细加工。此外，这项工作将这些表面的应用扩展到了气泡的精确放置和操纵上，这些气泡可以潜在地用于例如在设计用于管理传热的过程中控制气泡成核。分子诊断和微细加工。此外，这项工作将这些表面的应用扩展到了气泡的精确放置和操纵上，这些气泡可以潜在地用于例如在设计用于管理传热的过程中控制气泡成核。分子诊断和微细加工。此外，这项工作将这些表面的应用扩展到了气泡的精确放置和操纵上，这些气泡可以潜在地用于例如控制旨在控制传热的过程中的气泡成核。

更新日期：2018-01-09

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