Drying paths of phase-separating solution coatings exposed to humidity
Drying paths of phase-separating solution coatings exposed to humidity
复制标题
暴露于湿气中的相分离溶液涂层的干燥路径
DOI：
10.1007/s11998-021-00483-z
复制
发表时间：
2022
影响因子：
2.3
通讯作者：
Masato Yamamura
中科院分区：
文献类型：
--
作者：
大坪 華奈子;太田 早姫;吉野 祐樹;宇 敷 育男;木原 伸一;滝嶌 繁樹;Masato Yamamura
Drying process paths, i.e., time-dependent trajectories of solution compositions on a phase diagram, were examined for coatings of a water-immiscible acrylic monomer dissolved in ethanol and exposed to humidity. The absorption of water vapor quenched the solution into a thermodynamic nonequilibrium state and promoted a spontaneous phase separation when the water content in the solution exceeded a critical value. A simultaneous mass-loss and heat-flux measurement technique was proposed and adapted for phase-separating coatings to determine the evaporation rates of two volatile components with different latent heats of vaporization. The measured drying paths agreed with those predicted from a drying model that takes into account the gas-diffusion-limited evaporation and composition-dependent activities. The numerical predictions also revealed that the pseudo-azeotrope determined the critical drying conditions, under which any drying paths on the phase diagram did not cross the two-phase region, and thus the drying solutions remained stable.
