TY - JOUR
T1 - Spontaneous formation of two-dimensional micropatterns with straight and/or curving dendrites through crystal growth of Ba(NO3)2 in polymer matrix
AU - Tokutomi, Daijiro
AU - Ise, Ryuta
AU - Oaki, Yuya
AU - Imai, Hiroaki
PY - 2013/7/3
Y1 - 2013/7/3
N2 - Microscale patterns consisting of two-dimensional (2D) dendrites with trunks and branches 1-3 μm wide were precisely controlled through crystal growth in a thin polymer matrix by the use of a dipping technique. A variety of 2D micropatterns, such as orthogonal lattices, bull's horns, randomly curving weaves, and aligned dots, were homogeneously formed with an aqueous solution of Ba(NO3)2 and poly(vinyl alcohol) in a wide area ranging over several centimeters on flat and rounded substrates. The micrometric dendritic growth that produced these several patterns was tuned by changing the withdrawal rate and the polymer concentration. The crystallographic orientation of the micropatterns was characterized to discuss on the formation mechanism of the specific morphologies. The curving branches were found to be induced by gradual change in the growth direction through low-angle grain boundaries under a highly diffusion-limited condition. This simple, bottom-up patterning process is applicable for various crystalline materials, including inorganic and organic substances.
AB - Microscale patterns consisting of two-dimensional (2D) dendrites with trunks and branches 1-3 μm wide were precisely controlled through crystal growth in a thin polymer matrix by the use of a dipping technique. A variety of 2D micropatterns, such as orthogonal lattices, bull's horns, randomly curving weaves, and aligned dots, were homogeneously formed with an aqueous solution of Ba(NO3)2 and poly(vinyl alcohol) in a wide area ranging over several centimeters on flat and rounded substrates. The micrometric dendritic growth that produced these several patterns was tuned by changing the withdrawal rate and the polymer concentration. The crystallographic orientation of the micropatterns was characterized to discuss on the formation mechanism of the specific morphologies. The curving branches were found to be induced by gradual change in the growth direction through low-angle grain boundaries under a highly diffusion-limited condition. This simple, bottom-up patterning process is applicable for various crystalline materials, including inorganic and organic substances.
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U2 - 10.1021/cg400418n
DO - 10.1021/cg400418n
M3 - Article
AN - SCOPUS:84879877057
SN - 1528-7483
VL - 13
SP - 3011
EP - 3017
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 7
ER -