Iα → Iβ transition of cellulose under ultrasonic radiation
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Abstract
Aqueous suspensions of dispersed Glaucocystis cellulose microfibrils were sonicated at 4 °C for 3 h, using 24 kHz ultrasonic waves. This treatment induced a variety of ultrastructural defects, as the microfibrils became not only shortened, but also presented substantial damage materialized by kinks and subfibrillation. Upon analysis by X-ray diffraction and 13C solid-state NMR spectroscopy, it was found that the initial sample that contained 90 % of cellulose Iα allomorph became, to a large extent, unexpectedly converted into the Iβ phase, while the loss of crystallinity was only moderate during the sonication treatment.
Keywords
Cellulose microfibrils Glaucocystis Low frequency sonication Allomorphic transitionNotes
Acknowledgments
Funding for this project was provided by a grant from ‘Région Rhône-Alpes’. The early contributions of M. Yunoki and Y. Doudaine to this work are acknowledged. We also thank M.-F. Marais for the culture of Glaucocystis and H. Chanzy for continuing support and critical reading of the manuscript.
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