Varietal difference in cellulose microfibril dimensions observed by infrared spectroscopy |
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Authors: | Yoshiki Horikawa Bruno Clair Junji Sugiyama |
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Institution: | (1) Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto 611-0011, Japan;(2) Laboratoire de Mecanique et Génié Civil (LMGC), UMR 5508, CNRS, Université Montpellier 2, Place E. Bataillon, cc 048, Montpellier Cedex 5, 34095, France |
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Abstract: | We have previously reported a novel Fourier transform infrared (FTIR) method for evaluating both the accessibility and lateral
dimensions of cellulose microfibrils. This method differs from conventional deuteration in that the OH groups in the crystalline
region were initially completely deuterated. The samples were then rehydrogenated by immersing them in water at 25 °C, during
which only the OD groups on the surface were rehydrogenated. The ratio of OD to OH groups measured for cellulose from various
origins was used to estimate microfibril dimensions, which were compared with the data from X-ray diffractometry. The rehydrogenation
process was further investigated by immersing the deuterated samples in water at elevated temperatures. The behavior of rehydrogenation
under heat treatment was converted to observe the microfibril shape, which was in good agreement with the cross-sectional
images obtained by diffraction contrast transmission electron microscopy techniques. |
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Keywords: | Deuteration Rehydrogenation Fourier transform infrared (FTIR) Cellulose microfibril lateral dimension Diffraction contrast imaging |
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