News Column

Data from Forest Service Advance Knowledge in Nanocrystals

February 18, 2014

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Nanocrystals. According to news reporting originating in Pineville, Louisiana, by NewsRx journalists, research stated, "Structured xylan-based hydrogels, reinforced with cellulose nanocrystals (CNCs), have successfully been prepared from water suspensions by cross-linking during freeze-casting. In order to induce cross-linking during the solidification/sublimation operation, xylan was first oxidized using sodium periodate to introduce dialdehydes."

The news reporters obtained a quote from the research from Forest Service, "The oxidized xylan was then mixed with CNCs after which the suspension was frozen unidirectionally in order to control the ice crystal formation and by that the pore morphology of the material. Finally the ice crystal templates were removed by freeze-drying. During the freeze-casting process hemiacetal bonds are formed between the aldehyde groups and hydroxyl groups, either on other xylan molecules or on CNCs, which cross-links the system. The proposed cross-linking reaction was confirmed by using cross-polarization magic angle spinning (CP/MAS) nuclear magnetic resonance (NMR) spectroscopy. The pore morphology of the obtained materials was analyzed by scanning electron microscopy (SEM). The materials were also tested for compressive strength properties, both in dry and water swollen state."

According to the news reporters, the research concluded: "All together this study describes a novel combined freeze-casting/cross-linking process which enables fabrication of nanoreinforced biopolymer-based hydrogels with controlled porosity and 3-D architecture."

For more information on this research see: Ice templated and cross-linked xylan/nanocrystalline cellulose hydrogels. Carbohydrate Polymers, 2014;100():24-30. Carbohydrate Polymers can be contacted at: Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England. (Elsevier -; Carbohydrate Polymers -

Our news correspondents report that additional information may be obtained by contacting T. Kohnke, US Forest Serv, Dept. of Agriculture, So Res Stn, Pineville, LA 71360, United States. Additional authors for this research include T. Elder, H. Theliander and A.J. Ragauskas (see also Nanocrystals).

Keywords for this news article include: Pineville, Louisiana, United States, Nanotechnology, Nanocrystalline, Emerging Technologies, North and Central America

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Source: Life Science Weekly

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