TY - JOUR
T1 - Orientation of the alkyl side chains and glucopyranose rings in Langmuir-Blodgett films of a regioselectively substituted cellulose ether
AU - Kasai, Wakako
AU - Tsutsumi, Keisuke
AU - Morita, Mitsuhiro
AU - Kondo, Tetsuo
N1 - Funding Information:
This research was supported partly by a Grant-in-Aid for Scientific Research (No. 14360101), Japan Society for the Promotion of Science (JSPS). The first author (WK) thanks JSPS Research Fellowships for their financial support.
PY - 2008/6
Y1 - 2008/6
N2 - An arrangement for the long alkyl side chains in a Langmuir-Blodgett (LB) film from regioselectively alkylated 2,3-di-O-octadecylcellulose on an Au-coated substrate was investigated using Fourier transform infrared reflection absorbance spectroscopy. The IR results indicated that the hydrophobic long alkyl side chains were forced to be repellent to the surface of water, resulting in deposition on the substrate, with it being tilted in the vertical direction, and further formed both hexagonal and orthorhombic crystalline structures up to 10 layers in the LB film. In addition, molecular modeling with CAChe software indicated that the optimized assembly of the side chains was supposed to own a vertical arrangement against the substrate surface after compression of the monolayer. This means that the conformation of 21 screw of the cellulose molecular chain may be altered by the compression to have an unusual conformation by a different φ-ψ dihedral angle such as onefold axis without a symmetry element.
AB - An arrangement for the long alkyl side chains in a Langmuir-Blodgett (LB) film from regioselectively alkylated 2,3-di-O-octadecylcellulose on an Au-coated substrate was investigated using Fourier transform infrared reflection absorbance spectroscopy. The IR results indicated that the hydrophobic long alkyl side chains were forced to be repellent to the surface of water, resulting in deposition on the substrate, with it being tilted in the vertical direction, and further formed both hexagonal and orthorhombic crystalline structures up to 10 layers in the LB film. In addition, molecular modeling with CAChe software indicated that the optimized assembly of the side chains was supposed to own a vertical arrangement against the substrate surface after compression of the monolayer. This means that the conformation of 21 screw of the cellulose molecular chain may be altered by the compression to have an unusual conformation by a different φ-ψ dihedral angle such as onefold axis without a symmetry element.
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U2 - 10.1007/s00396-007-1822-6
DO - 10.1007/s00396-007-1822-6
M3 - Article
AN - SCOPUS:44549084289
VL - 286
SP - 707
EP - 712
JO - Colloid and Polymer Science
JF - Colloid and Polymer Science
SN - 0303-402X
IS - 6-7
ER -