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231225s2021 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.1c00518
|2 doi
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|a eng
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|a Usgaonkar, Saurabh Shenvi
|e verfasserin
|4 aut
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| 245 |
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|a Achieving Stable Patterns in Multicomponent Polymer Thin Films Using Marangoni and van der Waals Forces
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|c 2021
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 08.06.2021
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Liquid-air interfaces can be deformed by surface-tension gradients to create topography, a phenomenon useful for polymer film patterning. A recently developed method creates these gradients by photochemically patterning a solid polymer film. Heating the film to the liquid state leads to flow driven by the patterned surface-tension gradients, but capillary leveling and diffusion of surface-active species facilitate eventual dissipation of the topography. However, experiments demonstrate that using blends of high- and low-molar-mass polymers can considerably delay the decay in topography. To gain insight into this observation, we develop a model based on lubrication theory that yields coupled nonlinear partial differential equations describing how the film height and species concentrations evolve with time and space. Incorporation of a nonmonotonic disjoining pressure is found to significantly increase the lifetime of topographical features, making the model predictions qualitatively consistent with experiments. A parametric study reveals the key variables controlling the kinetics of film deformation and provides guidelines for photochemically induced Marangoni patterning of polymer films
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|a Journal Article
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|a Ellison, Christopher J
|e verfasserin
|4 aut
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|a Kumar, Satish
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 37(2021), 22 vom: 08. Juni, Seite 6660-6672
|w (DE-627)NLM098181009
|x 1520-5827
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| 773 |
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|g volume:37
|g year:2021
|g number:22
|g day:08
|g month:06
|g pages:6660-6672
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|u http://dx.doi.org/10.1021/acs.langmuir.1c00518
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