Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 115, Issue 10, Pages 2155-2166Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1106839
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Funding
- DOE Office of Science ASCR SciDAC
- Center for Direct Catalytic Conversion of Biomass
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000997]
- National Science Foundation [MCB090159]
- NREL Computational Sciences Center supported by the DOE Office of EERE [DE-AC36-08GO28308]
- Alf de Ruvo Memorial Foundation of SCA AB
- Sweden-America Foundation
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molecular simulation to elucidate the structural behavior of small hydrated cellulose I beta microfibrils heated to 227 degrees C (500 K) with two carbohydrate force fields. In contrast to the characteristic two-dimensional hydrogen-bonded layer sheets present in the cellulose I beta crystal structure, we show that at high temperature a three-dimensional hydrogen bond network forms, made possible by hydroxymethyl groups changing conformation from trans-gauche (TG) to gauche-gauche (GG) in every second layer corresponding to center chains in cellulose I beta and from TG to gauche-trans (GT) in the origin layer. The presence of a regular three-dimensional hydrogen bond network between neighboring sheets eliminates the possibility of twist, whereas two-dimensional hydrogen bonding allows for microfibril twist to occur. Structural features of this high-temperature phase as determined by molecular simulation may explain several experimental observations for which no detailed structural basis has been offered. This includes an explanation for the observed temperature and crystal size dependence for the extent of hydrogen/deuterium exchange, and diffraction patterns of cellulose at high temperature.
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