Sum Frequency Generation Microscopy Study of Cellulose Fibers

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Abstract:

Sum frequency generation (SFG) microscopy images of cotton cellulose fibers were observed at the infrared wavenumber of ∼ 2945 cm–1 and with a spatial resolution of 2 μm. Domains of different cellulose microfibril bunches were observed and they showed different second-order nonlinear responses. The intensity of the peak of the asymmetric CH2 stretching mode at 2945 cm–1 depended strongly on the orientation of the electric fields of the incident visible and infrared light with respect to the cellulose fiber axis. The second-order nonlinear susceptibility arising from the chirality in the cellulose structure was found to be dominant. The SFG of the cross section of the cellulose fiber was relatively weak and showed a different spectrum from that measured from the side of the fiber axis.

Keywords: CELLULOSE; CHIRALITY; INFRARED SPECTROSCOPY; IR SPECTROSCOPY; MICROSCOPE; SFG; SUM FREQUENCY GENERATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/11-06388

Affiliations: 1: School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan; Faculty of Physics, Hanoi University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi 10000, Vietnam 2: School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan; Japan Science and Technology Agency, Core Research for Evolutional Science and Technology, 5-3 Sanban-cho, Chiyoda-ku, Tokyo 102-0075, Japan 3: Japan Science and Technology Agency, Core Research for Evolutional Science and Technology, 5-3 Sanban-cho, Chiyoda-ku, Tokyo 102-0075, Japan 4: School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan; Japan Science and Technology Agency, Core Research for Evolutional Science and Technology, 5-3 Sanban-cho, Chiyoda-ku, Tokyo 102-0075, Japan. mizutani@jaist.ac.jp

Publication date: November 1, 2011

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