Numerical simulation of the liquid phase in SnO2 thin film deposition by sol-gel-dip-coating

The fluid flow of the liquid phase in the sol-gel-dip-coating process for SnO 2 thin film deposition is numerically simulated. This calculation yields useful information on the velocity distribution close to the substrate, where the film is deposited. The fluid modeling is done by assuming Newtonian...

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Bibliographic Details
Published in:	Journal of sol-gel science and technology Vol. 55; no. 3; pp. 385 - 393
Main Authors:	Carvalho, Dayene M., Maciel, Jorge L. B., Ravaro, Leandro P., Garcia, Rogério E., Ferreira, Valdemir G., Scalvi, Luis V. A.
Format:	Journal Article
Language:	English
Published:	Boston Springer US 01-09-2010 Springer Springer Nature B.V
Subjects:	Ceramics Chemistry Chemistry and Materials Science Colloidal gels. Colloidal sols Colloidal state and disperse state Composites Computational fluid dynamics Computer simulation Deposition Dip coatings Exact sciences and technology Finite difference method Fluid flow Fluids General and physical chemistry Glass Immersion coating Inorganic Chemistry Liquid phases Materials Science Mathematical models Nanotechnology Natural Materials Optical and Electronic Materials Original Paper Plasma Shear stress Sol-gel processes Substrates Thin films Tin dioxide Velocity distribution Velocity gradient Viscosity X-ray diffraction Thin films Numerical simulation Tin dioxide Liquid phase Coating process Viscosity Binary compound Film Velocity distribution Modeling Thin film Tin oxide Calculation Dip coating Gradient Fluid Equation X ray diffraction Transmittance Velocity Base Substrate Sol gel process Colloidal suspension Shear stress Rheological properties
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Summary:	The fluid flow of the liquid phase in the sol-gel-dip-coating process for SnO 2 thin film deposition is numerically simulated. This calculation yields useful information on the velocity distribution close to the substrate, where the film is deposited. The fluid modeling is done by assuming Newtonian behavior, since the linear relation between shear stress and velocity gradient is observed. Besides, very low viscosities are used. The fluid governing equations are the Navier–Stokes in the two dimensional form, discretized by the finite difference technique. Results of optical transmittance and X-ray diffraction on films obtained from colloidal suspensions with regular viscosity, confirm the substrate base as the thickest part of the film, as inferred from the numerical simulation. In addition, as the viscosity increases, the fluid acquires more uniform velocity distribution close to the substrate, leading to more homogenous and uniform films.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0928-0707 1573-4846
DOI:	10.1007/s10971-010-2263-0