Magnetic Resonance Studies of Hierarchically Ordered Replicas of Wood Cellular Structures Prepared by Surfactant-Mediated Mineralization

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DOIResolve DOI: http://doi.org/10.1021/jp030027fS1089-5647(03)00027-0
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TypeArticle
Journal titleJournal Of Physical Chemistry B - Condensed Phase
ISSN15206106
Volume107
Issue50
Pages1379313802; # of pages: 10
AbstractHierarchically ordered positive and negative replicas of wood cellular structures prepared using surfactant templating methods under acidic and basic conditions have been studied by means of continuous flow hyperpolarized 129Xe NMR, solid-state MAS 13C, 29Si, and 2D WISE NMR spectroscopic techniques. 129Xe NMR data confirm a highly ordered and uniform structure with interconnected porosity in the positive silica wood replicas (SWR(+)) prepared under acidic conditions. In contrast, nonuniform porosity with irregular pore structures is inferred from similar data for negative silica wood replicas (SWR(-)) prepared under basic conditions. This contrasts with results from N2 adsorption and TEM measurements that indicate regular nanoporous channels in both cases. From 13C MAS NMR spectra, significant leaching of wood lignin was found to occur under acidic but was not evident for samples subjected to basic treatment. 29Si MAS NMR spectra revealed higher hydroxylation levels for the silica replica prepared under acidic conditions compared to those observed in samples prepared under basic conditions. 2D WISE NMR experiments showed increased mobility of protons associated with the organic functional groups in cellulose after acidic treatment when compared with the dry and base-treated wood. Reported NMR data provide compelling evidence for the proposed mechanism of surfactant directed mineralization of wood cellular structures in acidic and basic solutions.
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AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
Identifier18077705
NPARC number12328134
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Record identifier84ff1139-ea80-489e-be8f-252346b96d4b
Record created2009-09-10
Record modified2016-05-09
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