TY - JOUR
T1 - Self-assembling structures and thin-film microscopic morphologies of amphiphilic rod-coil block oligomers
AU - Li, Hongbo
AU - Liu, Qingtao
AU - Qin, Lidong
AU - Xu, Miao
AU - Lin, Xiankun
AU - Yin, Shengyan
AU - Wu, Lixin
AU - Su, Zhongmin
AU - Shen, Jiacong
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant 20473032), the Major State Basic Research Development Program (Grant G2000078102), the Innovation Fund of Jilin University, PCSIRT of Ministry of Education of China and Open Project of State Key Laboratory of Polymer Physics and Chemistry of CAS.
PY - 2005/9/15
Y1 - 2005/9/15
N2 - This paper examines the influences of solvent evaporation and atmosphere humidity on self-assembling structures and thin-film microscopic morphologies of amphiphilic rod-coil block oligomers (EOnOPV) containing conjugated oligo(phenylene vinylene) dimer (OPV) coupled to poly(ethylene oxide) (PEO; n, the average number of ethylene oxides, is 16, 12, 7, and 3, respectively) on hydrophilic substrates. Atomic force microscopy (AFM), UV-vis absorption, and small angle X-ray diffraction are employed to investigate the thin-film morphology and structure. Solvent evaporation and atmosphere humidity are found to exert a strong influence on thin-film morphology and structure. Under the condition of quick evaporation and dry atmosphere, all EOnOPV oligomers form the monolayer islands. Increasing the solute volume, both EO 16OPV and EO12OPV oligomers can form the polar lamellas with a head-to-tail packing arrangement. Under the condition of slow evaporation and humid atmosphere, EO16OPV and EO12OPV may self-assembly into curvy nanoribbons with well-defined width and curvature radii on mica, while EO7OPV and EO3OPV with the shorter PEO coils do not form. A symmetric bilayer structure for the ribbons is proposed. Plausible reasons for the variation in thin-film morphology are discussed, based on the results obtained from investigation of PEO coil length, solvent evaporation, and atmosphere humidity effects.
AB - This paper examines the influences of solvent evaporation and atmosphere humidity on self-assembling structures and thin-film microscopic morphologies of amphiphilic rod-coil block oligomers (EOnOPV) containing conjugated oligo(phenylene vinylene) dimer (OPV) coupled to poly(ethylene oxide) (PEO; n, the average number of ethylene oxides, is 16, 12, 7, and 3, respectively) on hydrophilic substrates. Atomic force microscopy (AFM), UV-vis absorption, and small angle X-ray diffraction are employed to investigate the thin-film morphology and structure. Solvent evaporation and atmosphere humidity are found to exert a strong influence on thin-film morphology and structure. Under the condition of quick evaporation and dry atmosphere, all EOnOPV oligomers form the monolayer islands. Increasing the solute volume, both EO 16OPV and EO12OPV oligomers can form the polar lamellas with a head-to-tail packing arrangement. Under the condition of slow evaporation and humid atmosphere, EO16OPV and EO12OPV may self-assembly into curvy nanoribbons with well-defined width and curvature radii on mica, while EO7OPV and EO3OPV with the shorter PEO coils do not form. A symmetric bilayer structure for the ribbons is proposed. Plausible reasons for the variation in thin-film morphology are discussed, based on the results obtained from investigation of PEO coil length, solvent evaporation, and atmosphere humidity effects.
KW - AFM image
KW - Humidity
KW - Rod-coil block oligomer
KW - Self-assembling structure
KW - Solvent evaporation
KW - Thin-film microscopic morphology
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U2 - 10.1016/j.jcis.2005.03.052
DO - 10.1016/j.jcis.2005.03.052
M3 - Article
C2 - 15936765
AN - SCOPUS:23844556315
SN - 0021-9797
VL - 289
SP - 488
EP - 497
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
IS - 2
ER -