TY - JOUR
T1 - Evaporation-induced pattern formation in polymer films via secondary phase separation
AU - Yamamura, Masato
AU - Nishio, Takatoshi
AU - Kajiwara, Toshihisa
AU - Adachi, Kitaro
N1 - Funding Information:
This work was supported in part by a Grant-in-Aid (No. 11750655) for the Encouragement of Young Scientists from the Japan Society for the Promotion of Science. We acknowledge L.E. Scriven for the helpful discussions.
PY - 2002/8
Y1 - 2002/8
N2 - The ordered necklace-like or cellular pattern formation has been investigated for ternary polymer solutions in which primary and secondary phase separations were induced by the solvent evaporation. The patterns consisted of regular droplet arrays of various diameters, which arose in the pre-existing polymer phases via the secondary phase separation. The pattern formation was enhanced with increasing air velocity and ambient humidity, while it was suppressed with decreasing initial film thickness. The regular pattern was independent of surface wettability of the solid substrate. We ascribe the morphology change to the evaporation-induced surface tension driven convection, which re-arranged the droplet distributions from disordered to flow-induced ordered patterns.
AB - The ordered necklace-like or cellular pattern formation has been investigated for ternary polymer solutions in which primary and secondary phase separations were induced by the solvent evaporation. The patterns consisted of regular droplet arrays of various diameters, which arose in the pre-existing polymer phases via the secondary phase separation. The pattern formation was enhanced with increasing air velocity and ambient humidity, while it was suppressed with decreasing initial film thickness. The regular pattern was independent of surface wettability of the solid substrate. We ascribe the morphology change to the evaporation-induced surface tension driven convection, which re-arranged the droplet distributions from disordered to flow-induced ordered patterns.
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U2 - 10.1016/S0009-2509(02)00177-X
DO - 10.1016/S0009-2509(02)00177-X
M3 - Article
AN - SCOPUS:0036695184
SN - 0009-2509
VL - 57
SP - 2901
EP - 2905
JO - Chemical Engineering Science
JF - Chemical Engineering Science
IS - 15
ER -