Transition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB

Abstract Spin dewetting refers to spontaneous rupture of the dispensed solution layer during spin coating, resulting in isolated but periodic, regular sized domains of the solute and is pre-dominant when the solute concentration (C n ) is very low. In this article we report how the morphology of liq...

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Autores principales:	Palash Dhara, Nandini Bhandaru, Anuja Das, Rabibrata Mukherjee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/591c61dbe2f34863bd5dfba47ca49196
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spelling	oai:doaj.org-article:591c61dbe2f34863bd5dfba47ca491962021-12-02T12:32:21ZTransition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB10.1038/s41598-018-25504-72045-2322https://doaj.org/article/591c61dbe2f34863bd5dfba47ca491962018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25504-7https://doaj.org/toc/2045-2322Abstract Spin dewetting refers to spontaneous rupture of the dispensed solution layer during spin coating, resulting in isolated but periodic, regular sized domains of the solute and is pre-dominant when the solute concentration (C n ) is very low. In this article we report how the morphology of liquid crystal (LC) 5CB thin films coated on flat and patterned PMMA substrate transform from spin dewetted droplets to continuous films with increase in C n . We further show that within the spin dewetted regime, with gradual increase in the solute concentration, periodicity of the isotropic droplets (λ D ) as well as their mean diameter (d D ), gradually decreases, till the film becomes continuous at a critical concentration (C n *). Interestingly, the trend that λ D reduces with increase in C n is exact opposite to what is observed in thermal/solvent vapor induced dewetting of a thin film. The spin dewetted droplets exhibit transient Radial texture, in contrast to Schlieren texture observed in elongated threads and continuous films of 5CB, which remains in the Nematic phase at room temperature. Finally we show that by casting the film on a grating patterned substrate it becomes possible to align the spin dewetted droplets along the contours substrate patterns.Palash DharaNandini BhandaruAnuja DasRabibrata MukherjeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Palash Dhara Nandini Bhandaru Anuja Das Rabibrata Mukherjee Transition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB
description	Abstract Spin dewetting refers to spontaneous rupture of the dispensed solution layer during spin coating, resulting in isolated but periodic, regular sized domains of the solute and is pre-dominant when the solute concentration (C n ) is very low. In this article we report how the morphology of liquid crystal (LC) 5CB thin films coated on flat and patterned PMMA substrate transform from spin dewetted droplets to continuous films with increase in C n . We further show that within the spin dewetted regime, with gradual increase in the solute concentration, periodicity of the isotropic droplets (λ D ) as well as their mean diameter (d D ), gradually decreases, till the film becomes continuous at a critical concentration (C n *). Interestingly, the trend that λ D reduces with increase in C n is exact opposite to what is observed in thermal/solvent vapor induced dewetting of a thin film. The spin dewetted droplets exhibit transient Radial texture, in contrast to Schlieren texture observed in elongated threads and continuous films of 5CB, which remains in the Nematic phase at room temperature. Finally we show that by casting the film on a grating patterned substrate it becomes possible to align the spin dewetted droplets along the contours substrate patterns.
format	article
author	Palash Dhara Nandini Bhandaru Anuja Das Rabibrata Mukherjee
author_facet	Palash Dhara Nandini Bhandaru Anuja Das Rabibrata Mukherjee
author_sort	Palash Dhara
title	Transition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB
title_short	Transition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB
title_full	Transition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB
title_fullStr	Transition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB
title_full_unstemmed	Transition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB
title_sort	transition from spin dewetting to continuous film in spin coating of liquid crystal 5cb
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/591c61dbe2f34863bd5dfba47ca49196
work_keys_str_mv	AT palashdhara transitionfromspindewettingtocontinuousfilminspincoatingofliquidcrystal5cb AT nandinibhandaru transitionfromspindewettingtocontinuousfilminspincoatingofliquidcrystal5cb AT anujadas transitionfromspindewettingtocontinuousfilminspincoatingofliquidcrystal5cb AT rabibratamukherjee transitionfromspindewettingtocontinuousfilminspincoatingofliquidcrystal5cb
_version_	1718394095098920960

Transition from Spin Dewetting to continuous film in spin coating of Liquid Crystal 5CB

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