Marangoni Convection in a Photo-Chemically Reacting Liquid

Golovin, A. A.; Volpert, Vladimir A.

doi:10.1051/mmnp:2008032

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…As our group demonstrated in recent experiments,21 by patterning surface energy gradients into a solid thin polymer film, the Marangoni effect can be harnessed to direct flow in the melt state. It is important to note that previous theoretical studies82–84 have explored similar ideas, although some of the details are different.…”

Section: Directing Convection In Polymer Films By Photochemical Pattementioning

confidence: 99%

Directing convection to pattern thin polymer films

Janes

Katzenstein

Shanmuganathan

et al. 2013

J Polym Sci B Polym Phys

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Convection can be harnessed in elegant ways to pattern surfaces, often using uncomplicated equipment and materials, providing an interesting platform for future technological developments in thin film topographic assemblies. This manuscript contains a brief review of thin polymer film patterning methods that rely on directing convection, such as ''coffee ring'' patterning, lithographically induced self-assembly, and electrohydrodynamic patterning. These techniques are described in the context of a recent approach explored in our group for generating topographic patterns by photochemically directing Marangoni flow in thin polymer films with subtle gradients in surface energy. Aspects unique to this process are highlighted so that they may facilitate new developments in manufacturing technologically impactful patterned surfaces. For example, the features produced by photochemically directed Marangoni-driven flow are preprogrammed in the solid state, thermally developed and can be formed in multilayer films.

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Section: Directing Convection In Polymer Films By Photochemical Pattementioning

confidence: 99%

Directing convection to pattern thin polymer films

Janes

Katzenstein

Shanmuganathan

et al. 2013

J Polym Sci B Polym Phys

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“…Another interesting feature of this process is that upon significant additional heating of the film above its T g , on the order of hours, the features dissipate resulting in a featureless, flat film. Marangoni flow in liquids driven by reversible photochemical reactions in Newtonian liquids has previously been examined from a theoretical standpoint. , While the photochemical reaction of PS is in principle irreversible, these studies describe an interesting theoretical framework for consideration in future experiments.…”

mentioning

confidence: 99%

Patterning by Photochemically Directing the Marangoni Effect

et al. 2012

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Polystyrene (PS) that has been exposed to ultraviolet light (UV) undergoes partial dehydrogenation of the alkane polymer backbone which increases its surface energy. Exploiting this photochemistry, we exposed polystyrene films to UV light using a photomask to induce a patterned photochemical reaction producing regions in the film with differing surface energy. Upon heating the solid polymer film with the preprogrammed surface energy pattern to a liquid state, the polymer flows from the low surface energy unexposed regions to high surface energy exposed regions. This flow creates three-dimensional topography by the Marangoni Effect, which describes convective mass transfer due to surface energy gradients. The topographical features can be permanently preserved by quenching the film below its glass to liquid transition temperature. Their shape and organization are only limited by the pattern on the photomask.

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“…Chowdhury et al reported on experiments regarding UV-induced photopolymerization reactions of aniline films floating on water. Golovin and Volpert , studied the Marangoni instability of a thin liquid layer subject to uniform illumination that triggers a reversible photochemical reaction. They performed a linear stability analysis as well as numerical simulations of the evolution equations for the height and reactant concentration profiles.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Photochemical Reactions Using Marangoni Flows

2017

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We evaluated the sensitivity and time resolution of a technique for photochemical reaction monitoring based on the interferometric detection of the deformation of liquid films. The reaction products change the local surface tension and induce Marangoni flow in the liquid film. As a model system, we consider the irradiation of the aliphatic hydrocarbon squalane with broadband deep-UV light. We developed a numerical model that quantitatively reproduces the flow patterns observed in the experiments. Moreover, we present self-similarity solutions that elucidate the mechanisms governing different stages of the dynamics and their parametric dependence. Surface tension changes as small as Δγ = 10–6 N/m can be detected, and time resolutions of <1 s can be achieved.

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Marangoni Convection in a Photo-Chemically Reacting Liquid

Cited by 3 publications

References 21 publications

Directing convection to pattern thin polymer films

Directing convection to pattern thin polymer films

Patterning by Photochemically Directing the Marangoni Effect

Monitoring Photochemical Reactions Using Marangoni Flows

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