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      Thermodiffusion as a means to manipulate liquid film dynamics on chemically patterned surfaces

      1 , 1
      The Journal of Chemical Physics
      AIP Publishing

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          Abstract

          <p class="first" id="d9072986e141">The model problem examined here is the stability of a thin liquid film consisting of two miscible components, resting on a chemically patterned solid substrate and heated from below. In addition to surface tension gradients, the temperature variations also induce gradients in the concentration of the film by virtue of thermodiffusion/Soret effects. We study the stability and dewetting behaviour due to the coupled interplay between thermal gradients, Soret effects, long-range van der Waals forces, and wettability gradient-driven flows. Linear stability analysis is first employed to predict growth rates and the critical Marangoni number for chemically homogeneous surfaces. Then, nonlinear simulations are performed to unravel the interfacial dynamics and possible locations of the film rupture on chemically patterned substrates. Results suggest that appropriate tuning of the Soret parameter and its direction, in conjunction with either heating or cooling, can help manipulate the location and time scales of the film rupture. The Soret effect can either potentially aid or oppose film instability depending on whether the thermal and solutal contributions to flow are cooperative or opposed to each other. </p>

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          Pattern formation outside of equilibrium

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            Microfluidics: Fluid physics at the nanoliter scale

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              Long-scale evolution of thin liquid films

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                Author and article information

                Journal
                JCPSA6
                The Journal of Chemical Physics
                J. Chem. Phys.
                AIP Publishing
                0021-9606
                1089-7690
                June 07 2017
                June 07 2017
                June 06 2017
                : 146
                : 21
                : 214706
                Affiliations
                [1 ]Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
                Article
                10.1063/1.4984610
                5461176
                28595391
                3a389c99-4916-4c40-adc6-89ad713d4e81
                © 2017
                History

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