Assembling and orientation of polyfluorenes in solution controlled by a focused near-infrared laser beam

被引:36
作者
Masuo, S
Yoshikawa, H
Nothofer, HG
Grimsdale, AC
Scherf, U
Müllen, K
Masuhara, H [1 ]
机构
[1] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan
[2] Max Planck Inst Polymer Res, D-55021 Mainz, Germany
关键词
D O I
10.1021/jp0441184
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ordered fibril- and particle-like assemblies of poly(2,7-(9,9-bis(2-ethylhexyl)fluorene)) 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.
引用
收藏
页码:6917 / 6921
页数:5
相关论文
共 33 条
[1]  
[Anonymous], 1992, BENARD CELLS TAYLOR
[2]   OBSERVATION OF A SINGLE-BEAM GRADIENT FORCE OPTICAL TRAP FOR DIELECTRIC PARTICLES [J].
ASHKIN, A ;
DZIEDZIC, JM ;
BJORKHOLM, JE ;
CHU, S .
OPTICS LETTERS, 1986, 11 (05) :288-290
[3]   OPTICAL TRAPPING AND MANIPULATION OF SINGLE CELLS USING INFRARED-LASER BEAMS [J].
ASHKIN, A ;
DZIEDZIC, JM ;
YAMANE, T .
NATURE, 1987, 330 (6150) :769-771
[4]   Spin-dependent tunneling in self-assembled cobalt-nanocrystal superlattices [J].
Black, CT ;
Murray, CB ;
Sandstrom, RL ;
Sun, SH .
SCIENCE, 2000, 290 (5494) :1131-1134
[5]   Self-assembly of nanoparticles into structured spherical and network aggregates [J].
Boal, AK ;
Ilhan, F ;
DeRouchey, JE ;
Thurn-Albrecht, T ;
Russell, TP ;
Rotello, VM .
NATURE, 2000, 404 (6779) :746-748
[6]  
Colinet P, 2001, NONLINEAR DYNAMICS S
[7]   Liquid morphologies on structured surfaces: From microchannels to microchips [J].
Gau, H ;
Herminghaus, S ;
Lenz, P ;
Lipowsky, R .
SCIENCE, 1999, 283 (5398) :46-49
[8]   Anisotropic spinodal dewetting as a route to self-assembly of patterned surfaces [J].
Higgins, AM ;
Jones, RAL .
NATURE, 2000, 404 (6777) :476-478
[9]   Laser induced phase transition in aqueous solutions of hydrophobically modified poly(N-isopropylacrylamide). [J].
Hofkens, J ;
Hotta, JI ;
Sasaki, K ;
Masuhara, H ;
Faes, H ;
DeSchryver, F .
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1996, 283 :165-+
[10]   Molecular assembling by the radiation pressure of a focused laser beam: Poly(N-isopropylacrylamide) in aqueous solution [J].
Hofkens, J ;
Hotta, J ;
Sasaki, K ;
Masuhara, H ;
Iwai, K .
LANGMUIR, 1997, 13 (03) :414-419