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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Self-Assembly of Mesoscopic Materials To Form Controlled and Continuous Patterns by Thermo-Optically Manipulated Laser Induced Microbubbles
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Self-Assembly of Mesoscopic Materials To Form Controlled and Continuous Patterns by Thermo-Optically Manipulated Laser Induced Microbubbles

机译：介观材料的自组装，通过热光操纵的激光诱导的微气泡形成受控的连续图案

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摘要

The formation of continuous patterns of nanostructured materials using directed self-assembly under external fields has generated considerable current research interest. We demonstrate for the first time such continuous patterning by inducing irreversible self-assembly leading to nucleation in mesocopic materials (inorganic, organic, and nanoparticles) using a tightly focused laser beam in an optical tweezers apparatus. A dense aqueous dispersion or solution of the material which has high absorption at the laser wavelength is taken in a sample holder so that some material is adsorbed on the top surface. A hot spot is created on the top surface when the adsorbed material absorbs the high intensity at the focus of the laser beam (a submicrometer sized spot), due to which a water vapor bubble is formed. This causes self-assembly of material around the bubble due to Gibbs?Marangoni convection and capillary flow after which the material eventually nucleates into a crystalline state. The bubble is "trapped" at the hot spot due to the temperature gradient around it and can be manipulated by thermal forces generated optically, so that the system may be described as a "thermo-optical" tweezers. We translate the trapped bubble using the microscope sample holder stage of the apparatus so that the nucleation site of the material is simultaneously translated generating continuous patterns. We have demonstrated the technique using exotic inorganic materials such as soft oxometalates, an organic material such as glycine, and a fluorescent dye such as perylene as well as with carbon nanotubes. We have written patterns over lengths of nearly 1 mm at the rate of 1 Hz, with best resolution of about 4 μm. The technique has potential for a wide range of applications ranging from solution processed printable electronics to controlled catalysis.
机译：在外部场下使用定向自组装形成纳米结构材料的连续图案已经引起了相当大的当前研究兴趣。我们首次通过在光镊装置中使用紧密聚焦的激光束诱导介观材料（无机，有机和纳米颗粒）中的不可逆的自组装导致成核，从而首次证明了这种连续图案化。在样品固定器中吸收在激光波长下具有高吸收率的致密材料的水分散液或溶液，以使某些材料吸附在顶表面上。当被吸附的材料在激光束的焦点处吸收高强度时（在亚微米尺寸的点处），在顶面上会形成热点，从而形成水蒸气气泡。由于吉布斯-马兰戈尼对流和毛细管流动，这会导致气泡周围的材料自组装，此后材料最终成核为结晶态。由于气泡周围的温度梯度，气泡被“捕获”在热点上，并且可以通过光学产生的热力进行操纵，因此该系统可称为“热光”镊子。我们使用该设备的显微镜样品夹持器平台来平移捕获的气泡，以便同时平移材料的成核位置，从而生成连续的图案。我们已经证明了使用异质无机材料（如软金属氧酸盐），有机材料（如甘氨酸）和荧光染料（如per）以及碳纳米管的技术。我们以1 Hz的速率编写了近1 mm长度的图案，最佳分辨率约为4μm。该技术具有广泛的应用潜力，从溶液处理的可印刷电子产品到受控催化。

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