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Title: Breakdown of hierarchical architecture in cellulose during dilute acid pretreatments

Cellulose is an attractive candidate as a feedstock for sustainable bioenergy because of its global abundance. Pretreatment of biomass has significant influence on the chemical availability of cellulose locked in recalcitrant microfibrils. Optimizing pretreatment depends on an understanding of its impact on the microscale and nanoscale molecular architecture. X-ray scattering experiments have been performed on native and pre-treated maize stover and models of cellulose architecture have been derived from these data. Ultra small-angle, very small-angle and small-angle X-ray scattering (USAXS, VSAXS and SAXS) probe three different levels of architectural scale. USAXS and SAXS have been used to study cellulose at two distinct length scales, modeling the fibrils as ~30 Å diameter rods packed into ~0.14 μm diameter bundles. VSAXS is sensitive to structural features at length scales between these two extremes. Detailed analysis of diffraction patterns from untreated and pretreated maize using cylindrical Guinier plots and the derivatives of these plots reveals the presence of substructures within the ~0.14 μm diameter bundles that correspond to grouping of cellulose approximately 30 nm in diameter. These sub-structures are resilient to dilute acid pretreatments but are sensitive to pretreatment when iron sulfate is added. Lastly, these results provide evidence of the hierarchical arrangementmore » of cellulose at three length scales and the evolution of these arrangements during pre-treatments.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [1]
  1. Northeastern Univ., Boston, MA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
OSTI Identifier:
1220801
Report Number(s):
NREL/JA--2700-64627
Journal ID: ISSN 0969-0239
Grant/Contract Number:
AC36-08GO28308
Type:
Accepted Manuscript
Journal Name:
Cellulose
Additional Journal Information:
Journal Volume: 22; Journal Issue: 3; Journal ID: ISSN 0969-0239
Publisher:
Springer
Research Org:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS cellulose; hierarchical architecture; guinier analysis; multi-angle X-ray scattering