TY - JOUR
T1 - Assembling and orientation of polyfluorenes in solution controlled by a focused near-infrared laser beam
AU - Masuo, Sadahiro
AU - Yoshikawa, Hiroyuki
AU - Nothofer, Heinz Georg
AU - Grimsdale, Andrew C.
AU - Scherf, Ullrich
AU - Müllen, Klaus
AU - Masuhara, Hiroshi
PY - 2005/4/21
Y1 - 2005/4/21
N2 - Ordered fibril- and particle-like assemblies of poly(2,7-(9,9-bis(2- ethylhexyl)fluorcne)) can be formed by photon force of a focused near-infrared laser beam during the drying process of its tetrahydrofuran solution on a glass substrate. These formations have been achieved controllably by combining laser irradiation with convection in the cast solution; that is, when viscous drag of the solution in the convection is stronger than the photon force, the fibril-like assemblies can be formed. Molecular orientation in the assemblies differs from that in self-assembled fibril-like structures, and maybe it can be controlled by the polarization direction of the focused laser beam. We have demonstrated that the length and width of the assemblies can be controlled by the irradiation time, the laser power, the concentration of the solution, and the convection rate in the solution. On the other hand, when the viscous drag of the solution in the convection is weak compared to the photon force, particle-like assemblies in which molecular orientation is controlled by polarization direction are formed.
AB - Ordered fibril- and particle-like assemblies of poly(2,7-(9,9-bis(2- ethylhexyl)fluorcne)) can be formed by photon force of a focused near-infrared laser beam during the drying process of its tetrahydrofuran solution on a glass substrate. These formations have been achieved controllably by combining laser irradiation with convection in the cast solution; that is, when viscous drag of the solution in the convection is stronger than the photon force, the fibril-like assemblies can be formed. Molecular orientation in the assemblies differs from that in self-assembled fibril-like structures, and maybe it can be controlled by the polarization direction of the focused laser beam. We have demonstrated that the length and width of the assemblies can be controlled by the irradiation time, the laser power, the concentration of the solution, and the convection rate in the solution. On the other hand, when the viscous drag of the solution in the convection is weak compared to the photon force, particle-like assemblies in which molecular orientation is controlled by polarization direction are formed.
UR - http://www.scopus.com/inward/record.url?scp=18144398210&partnerID=8YFLogxK
U2 - 10.1021/jp0441184
DO - 10.1021/jp0441184
M3 - Article
C2 - 16851779
AN - SCOPUS:18144398210
VL - 109
SP - 6917
EP - 6921
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 15
ER -