Spin-speed independent thickness and molecular adsorption behaviour of polyelectrolyte multilayers

Boranna, R and Nataraj, CT and Jagannath, RK and Pahal, S and Varma, MM and Prashanth, GR (2021) Spin-speed independent thickness and molecular adsorption behaviour of polyelectrolyte multilayers. In: EPJ Applied Physics, 93 (2).

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Abstract

The science behind the build-up mechanism of polyelectrolyte multilayers is important for developing devices for various engineering applications. Here we, study the dependency of thickness of polyelectrolyte multilayer films, fabricated using spin-assisted layer-by-layer self-assembly of polyelectrolytes technique, with respect to varying spin-speed while keeping all other parameters of the fabrication process-window constant. The thickness measurements were performed using variable angle spectroscopic ellipsometry and atomic force microscopy. The experimentally observed results were validated mathematically using a Flory type theory. In addition, the bio-molecular adsorption studies on these polyelectrolyte multilayer films fabricated at various spin-speeds, were also quantitatively analyzed using fluorescence microscopy studies. It was seen that the effect of spin-speed on the thickness of polyelectrolyte multilayers was negligible. In addition, it was also observed that the bio-molecular adsorption modalities onto these substrates were also independent of the spin-speed. This finding prompts to develop low-cost alternative technologies for various biomedical engineering applications, like functionalized substrates for centrifugal assay for fluorescence-based cell adhesion, wherein stability of films against strong mechanical forces generated during spinning can play an important role. © EDP Sciences, 2021.

Item Type:	Journal Article
Publication:	EPJ Applied Physics
Publisher:	EDP Sciences
Additional Information:	The copyright for this article belongs to EDP Sciences
Keywords:	Adsorption; Atomic force microscopy; Cell adhesion; Cell engineering; Cost engineering; Fluorescence; Fluorescence microscopy; Multilayers; Polyelectrolytes; Spectroscopic ellipsometry; Speed; Thickness measurement, Alternative technologies; Engineering applications; Functionalized substrates; Molecular adsorption; Polyelectrolyte multilayer; Polyelectrolyte multilayer film; Spin-assisted layer-by-layer self- assembly; Variable angle spectroscopic ellipsometry, Multilayer films
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	29 Dec 2021 06:15
Last Modified:	29 Dec 2021 06:15
URI:	http://eprints.iisc.ac.in/id/eprint/68202

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