Light-Tunable Solvent Drying in Photo-Responsive Solution Coatings

Abstract

Solvent drying rate of azobenzene/acetone solution coating was tunable by linearly polarized UV light. The light exposure promotes the photo-induced conformational change of azobenzene from its trans to its cis form, as well as the molecular alignment perpendicular to a polarization direction. Drying experiments of the photoresponsive solutions revealed that angled irradiation of s-polarized light showed a peculiar angle-dependent drying behavior, while no dependence was observed for the p-polarized light irradiation. The photo-induced solvent drying was observed in a particular range of azobenzene weight fractions and UV light intensities, suggesting a promising way to tune solvent drying rates by light.

Measuring the Drying Rate of Liquid Film Coatings Using Heat Flux Method

“…Understanding removal rates of the solvent from a gas-liquid interface is of practical and fundamental importance. The conventional gravimetric method, [1][2][3] by which a coating weight loss per unit area is measured over time, is often disturbed by fluctuations of the flowing air and is thus limited to low drying rates. Although recent progress in infrared [4,5] and confocal Raman [6] spectroscopies has enabled us to quantify local solvent concentrations in evaporating multicomponent liquids, careful calibrations are usually required for each chemical species.…”

Green light LED activated ligation of a scalable, versatile chalcone chromophore

“…Tunable materials exhibit properties that can be adapted in response to external stimuli, and are highly desired in many applications, ranging from inks 2 and coatings 3 to biomedical materials. 4 A variety of triggers can be used to alter materials such as temperature, pH, light and even magnetic fields.…”

Modeling of Surfactant-Enhanced Drying of Poly(styrene)-p-xylene Polymeric Coatings Using Machine Learning Technique

“…The drying rate of the solvent with a high plasticizer content was faster in the case of low solvent loading. The interactions of various polymers and surfactants have been studied and analyzed in the literature [4,[16][17][18][19][20][21][22][23][24]. The surfactant-assisted drying of polymer coatings has received less attention.…”

“…The results have shown an increase in drying rate by almost 10-15%. Few studies [4,24] have been conducted on fluorine-based surfactants in organic solvents, and one study has been referred to in water-based coatings.…”