Large area electrolyte coating through surface and interface engineering in roll-to-roll slot-die coating process

Slot-die coatings are advantageous when used for coating large-area flexible devices; in particular, the coating width can be controlled and simultaneous multi-layer coatings can be processed. To date, the effects of ink widening and the coating gap on the coating thickness have only been considered in a few studies. To this end, we developed two mathematical models to accurately estimate the coating width and thickness that consider these two effects. We used root mean square deviation (RMSD) to experimentally verify the developed method. When the coating gap was increased, the coating width increased and the coating thickness decreased. Experimental results showed that the estimated performances of the coating width and thickness models were as high as 98.46% and 95.8%, respectively. We think that the developed models can be useful for determining the coating conditions according to the ink properties to coat a functional layer with user-defined widths and thicknesses in both lab- and industrial-scale roll-to-roll slot-die coating processes.

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Numerical Modeling of Ink Widening and Coating Gap in Roll-to-Roll Slot-Die Coating of Solid Oxide Fuel Cell Electrolytic Layer

10.20944/preprints202011.0525.v1 ◽

2020 ◽

Author(s):

Seongyong Kim ◽

Jongsu Lee ◽

Minho Jo ◽

Changwoo Lee

Keyword(s):

Coating Thickness ◽

Solid Oxide ◽

Oxide Fuel ◽

Mean Square ◽

Large Area ◽

Functional Layer ◽

Slot Die Coating ◽

Flexible Devices ◽

Roll To Roll ◽

Slot Die

Slot-die coatings are advantageous when used for coating large-area flexible devices; in particular, the coating width can be controlled, and simultaneous multi-layer coatings can be processed. Till date, the effects of ink widening and coating gap on the coating thickness have only been considered in a few studies. To this end, we developed two mathematical models to accurately estimate the coating width and thickness considering these two effects. We used root mean square deviation (RMSD) to experimentally verify the developed method. The coating width was seen to increase and the coating thickness was seen to decrease when the coating gap was increased. Experimental results showed that the estimation performances of the coating width and thickness models were as high as 98.46 % and 95.8 %, respectively. We believe that the developed models can be useful for determining the coating conditions according to the ink properties to coat a functional layer with user-defined widths and thicknesses in both lab- and industrial-scale roll-to-roll slot-die coating processes.

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A one-step roll-to-roll process of stable AgNW/PEDOT:PSS solution using imidazole as a mild base for highly conductive and transparent films: optimizations and mechanisms

Journal of Materials Chemistry C ◽

10.1039/c5tc00801h ◽

2015 ◽

Vol 3 (22) ◽

pp. 5859-5868 ◽

Cited By ~ 51

Author(s):

Seyul Kim ◽

So Yeon Kim ◽

Moon Hyun Chung ◽

Jeonghun Kim ◽

Jung Hyun Kim

Keyword(s):

Optical Properties ◽

Electrical And Optical Properties ◽

Transparent Films ◽

Slot Die Coating ◽

Roll To Roll ◽

Transparent Conducting ◽

Slot Die ◽

Coating Method ◽

One Step

An AgNW/PEDOT:PSS coated, transparent, conducting, roll film (460 mm in width × 20 m in length) with good electrical and optical properties was produced using the roll-to-roll slot-die coating method.

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Transmittance Control of a Water-Repellent-Coated Layer on a Tensioned Web in a Roll-to-Roll Slot-Die Coating System

Polymers ◽

10.3390/polym13224003 ◽

2021 ◽

Vol 13 (22) ◽

pp. 4003

Author(s):

Seongyong Kim ◽

Minho Jo ◽

Jongsu Lee ◽

Changwoo Lee

Keyword(s):

Contact Angle ◽

Solar Cells ◽

Control Method ◽

Dominant Factor ◽

Water Repellent ◽

Process Conditions ◽

Slot Die Coating ◽

Roll To Roll ◽

Slot Die ◽

Transparent Water

Solar cells are important alternatives to fossil fuels for energy generation in today’s world, where the demand for alternative, renewable sources of energy is increasing. However, solar cells, which are installed outdoors, are susceptible to pollution by environmental factors. A solution to overcome this limitation involves coating solar cell surfaces with functional coatings. In this study, we propose a transmittance control method for a tensioned web in a roll-to-roll, transparent, water-repellent film coating. First, we analyzed the effects of process conditions on the transmittance and contact angle of the transparent water-repellent film during roll-to-roll slot-die coating. It was confirmed that the tension was the most dominant factor, followed by the coating gap. Through the tension control, the transmittance was changed by 3.27%, and the contact angle of the DI water was changed by 17.7°. In addition, it was confirmed that the transmittance was changed by 0.8% and the contact angle of DI water by 3.9° via the coating gap control. Based on these results, a transmittance prediction model was developed according to the tension and coating gap, and was then verified experimentally. Finally, a water-repellent film with a high transmittance of 89.77% was obtained using this model.

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