Leaching and drying marks on photoresist-coated substrates

Belmiloud, Naser; Tamaddon, Amir-Hossein; Mertens, P.; Struyf, Herbert

doi:10.1016/j.mee.2013.03.114

Cited by 2 publications

(2 citation statements)

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“…The formation of the dark rings of deposit is a result of the material being transported by internal flows inside the droplet caused by differences in the evaporation rate across the surface. Apart from a fundamental scientific interest, understanding the deposition of solids and being able to predict the topology of the resulting stain is of importance in applications such as inkjet printing 3,4 , semiconductor device manufacturing [5][6][7] and the creation of colloidal photonic crystals 8 . The redistribution and deposition of material due to the evaporation of a droplet are therefore studied extensively, both experimentally 1,2,[9][10][11][12] and theoretically 1,2,11,[13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

“…Whilst pinning and depinning in our theory are symmetric by construction, this needs not be the case in practice. Depinning and the final stages of drying frequently break circular symmetry 7,18 . In spite of its simplicity, our model predictions do qualitatively describe the salient features of the structure of watermark defects seen experimentally 5,17 .…”

Section: Introductionmentioning

confidence: 99%

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Compound redistribution due to droplet evaporation on a thin polymeric film: Theory

Heijden

Darhuber

Schoot

2019

Journal of Applied Physics

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A thin polymeric film in contact with a fluid body may leach low-molecular-weight compounds into the fluid. If this fluid is a small droplet, the compound concentration within the liquid increases due to ongoing leaching in combination with the evaporation of the droplet. This may eventually lead to an inversion of the transport process and a redistribution of the compounds within the thin film. In order to gain an understanding of the compound redistribution, we apply a macroscopic model for the evaporation of a droplet and combine that with a diffusion model for the compound transport. In the model, material deposition and the resulting contact line pinning are associated with the precipitation of a fraction of the dissolved material. We find three power law regimes for the size of the deposit area as a function of the initial droplet size, dictated by the competition between evaporation, diffusion and the initial compound concentrations in the droplet and the thin film. The strength of the contact line pinning determines the deposition profile of the precipitate, characterised by a pronounced edge and a linearly decaying profile towards the centre of the stain. Our predictions for the concentration profile within the solid substrate resemble patterns found experimentally.The following article will be submitted to Journal of Applied Physics. After it is published, it will be found at https://aip.scitation.org/journal/jap.

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