By a News Reporter-Staff News Editor at Life Science Weekly -- Research findings on Nanocrystals are discussed in a new report. According to news reporting originating from Aalto, Finland, by NewsRx correspondents, research stated, "Self-organized multilayer films were formed by sequential addition of oppositely charged cellulose I nanoparticles. The all-cellulosic multilayers were prepared via adsorption of cationicially modified cellulose nanofibrils (cat NFC) and anionic short crystalline cellulose (CNC) at pH 4.5 and pH 8.3."
Our news editors obtained a quote from the research from Aalto University, "The properties and build-up behavior of layer-by-layer-constructed films were studied with microgravimetry (QCM-D) and the direct surface forces in these systems were explored with colloidal probe microscopy to gain information about the fundamental interplay between cat NFC and anionic CNC. The importance of the first layer on the adsorption of the consecutive layers was demonstrated by comparing pure in situ adsorption in the QCM-D with multilayer films made by spin coating the first cationic NFC layer and then subsequently adsorbing the following layers in situ in the QCM-D chamber. Differences in adsorbed amount and viscoelastic behavior were observed between those two systems. In addition, a significant pH dependence of cat NFC charge was found for both direct surface interactions and layer properties. Moreover the underlying cellulose layer in multilayer film was established to influence the surface forces especially at lower pH, where the cat NFC chains extensions were facilitated and overall charge was affected by the cationic counterpart within the layers."
According to the news editors, the research concluded: "This enhanced understanding the effect of charge and structure on the interaction between these renewable nanoparticles is valuable when designing novel materials based on nanocellulose."
For more information on this research see: All-cellulose multilayers: long nanofibrils assembled with short nanocrystals. Cellulose, 2013;20(4):1777-1789. Cellulose can be contacted at: Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands. (Springer - www.springer.com; Cellulose - www.springerlink.com/content/0969-0239/)
The news editors report that additional information may be obtained by contacting A.M. Olszewska, Aalto Univ, Dept. of Forest Prod Technol, Sch Chem Technol, Aalto 00076, Finland. Additional authors for this research include E. Kontturi, J. Laine and M. Osterberg (see also Nanocrystals).
Keywords for this news article include: Aalto, Europe, Finland, Nanoparticle, Nanotechnology, Emerging Technologies
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