Molecularly thin nanoparticles from cellulose: isolation of sub-microfibrillar structures |
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Authors: | Qingqing Li Scott Renneckar |
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Institution: | (1) Department of Wood Science and Forest Products, Institute for Critical Technology and Applied Science Doctoral Scholar, Virginia Tech, Blacksburg, VA 24061, USA;(2) Department of Wood Science and Forest Products, Virginia Tech, Blacksburg, VA 24061, USA; |
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Abstract: | We have succeeded in isolating nanostructures from never-dried cellulose wood pulp, in sheet-form that have sub-microfibril
dimensions (single to double digit Å thickness with 100’s of nm in length). A recently developed oxidation procedure by Saito
and co-workers (Biomacromolecules 2006, 7:1687–1691) combined with extensive ultrasonication was used to liberate nanoscale
cellulose fibrils. We show structures, as determined with atomic force microscopy, that compose the well-known cellulose microfibril,
which are tenfold thinner than previous reports on nanoscale celluloses. This work provides indirect evidence in support of,
and is consistent with, the hypothesis that the intersheet van der Waals bonding of the cellulose fibril is significantly
weaker than the intrasheet hydrogen bonding of the cellulose microfibril. The structures are facile to isolate, contain enormous
specific surface area with rich chemical functionality providing potential for numerous novel applications. |
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