3D coffee stains,Materials Chemistry Frontiers

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3D coffee stains
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2017-08-24 00:00:00 , DOI: 10.1039/c7qm00281e
Itir Bakis Dogru _{1,

2,

3,

4} , Cagla Kosak Soz _{2,

3,

4,

5,

6} , Daniel Aaron Press _{2,

3,

4,

7} , Rustamzhon Melikov _{2,

3,

4,

7} , Efe Begar _{2,

3,

4,

8} , Deniz Conkar _{2,

3,

4,

8} , Elif Nur Firat Karalar _{2,

3,

4,

8} , Emel Yilgor _{2,

3,

4,

5,

6} , Iskender Yilgor _{1,

2,

3,

4,

5} , Sedat Nizamoglu _{1,

2,

3,

4,

6}

Affiliation

When a liquid droplet (e.g., coffee, wine, etc.) is splattered on a surface, the droplet dries in a ring-shaped stain. This widely observed pattern in everyday life occurs due to the phenomenon known as a coffee stain (or coffee ring) effect. While the droplet dries, the capillary flow moves and deposits the particles toward the pinned edges, which shows a 2D ring-like structure. Here we demonstrate the transition from a 2D to a 3D coffee stain that has a well-defined and hollow sphere-like structure, when the substrate surface is switched from hydrophilic to superhydrophobic. The 3D stain formation starts with the evaporation of the pinned aqueous colloidal droplet placed on a superhydrophobic surface that facilitates the particle flow towards the liquid–air interface. This leads to spherical skin formation and a cavity in the droplet. Afterwards the water loss in the cavity due to pervaporation leads to bubble nucleation and growth, until complete evaporation of the solvent. In addition to the superhydrophobicity of the surface, the concentration of the solution also has a significant effect on 3D coffee stain formation. Advantageously, 3D coffee stain formation in a pendant droplet configuration enables the construction of all-protein lasers by integrating silk fibroin with fluorescent proteins. No tools, components and/or human intervention are needed after the construction process is initiated; therefore, 3D coffee-stains hold promise for building self-assembled and functional 3D constructs and devices from colloidal solutions.

中文翻译：

3D咖啡渍

当液滴（例如咖啡，葡萄酒等））溅在表面上，液滴在环状污渍中干燥。在日常生活中这种广泛观察到的模式是由于被称为咖啡渍（或咖啡环）效应的现象而发生的。当液滴变干时，毛细管流移动并向钉扎边缘沉积颗粒，这显示了2D环状结构。在这里，我们展示了当基材表面从亲水性转变为超疏水性时，从2D到3D咖啡色的过渡过程，该过程具有定义明确的空心球状结构。3D污点的形成始于固定在超疏水表面上的固定胶态水状液滴的蒸发，该液滴促进了微粒向液-气界面的流动。这导致形成球形皮肤并在液滴中形成空腔。然后，由于全蒸发而导致腔体中的水分流失导致气泡成核和生长，直到溶剂完全蒸发。除了表面的超疏水性之外，溶液的浓度还对3D咖啡色斑的形成产生重大影响。有利地，通过将丝素蛋白与荧光蛋白整合在一起，以悬滴结构配置的3D咖啡色斑形成能够构建全蛋白激光。启动施工过程后，无需任何工具，组件和/或人工干预；因此，3D咖啡污渍有望从胶体溶液中构建自组装且功能齐全的3D结构和设备。溶液的浓度对3D咖啡色斑的形成也有显着影响。有利的是，通过将丝素蛋白与荧光蛋白结合在一起，以悬滴结构配置的3D咖啡色斑形成能够构建全蛋白激光。启动施工过程后，无需任何工具，组件和/或人工干预；因此，3D咖啡污渍有望从胶体溶液中构建自组装且功能齐全的3D结构和设备。溶液的浓度对3D咖啡色斑的形成也有显着影响。有利地，通过将丝素蛋白与荧光蛋白整合在一起，以悬滴结构配置的3D咖啡色斑形成能够构建全蛋白激光。启动施工过程后，无需任何工具，组件和/或人工干预；因此，3D咖啡污渍有望从胶体溶液中构建自组装且功能齐全的3D结构和设备。施工过程开始后，需要组件和/或人为干预；因此，3D咖啡污渍有望从胶体溶液中构建自组装且功能齐全的3D结构和设备。施工过程开始后，需要组件和/或人为干预；因此，3D咖啡污渍有望从胶体溶液中构建自组装且功能齐全的3D结构和设备。

更新日期：2017-10-26

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