By a News Reporter-Staff News Editor at Science Letter -- Researchers detail new data in Nanoparticles. According to news originating from Raleigh, North Carolina, by NewsRx correspondents, research stated, "We show a simple method toward nanoscale cilia-like structures, i.e., functional hairy surfaces, upon topochemically functionalizing nanorods of cellulose nanocrystals (CNCs) with thiol end groups (CNC-SHs), which leads to their immobilization onto a gold surface from one end, still allowing their orientational mobility. CNCs having a lateral dimension of 3-5 nm and length of 50-500 nm incorporate the native crystalline structure with hydrogen-bonded cellulose chains in the parallel configuration."
Our news journalists obtained a quote from the research from North Carolina State University, "This facilitates asymmetric, selective chemical modification of the reducing ends through reductive amination. Successful thiol functionalization is demonstrated using cryo transmission electron microscopy based on selective attachment of silver nanoparticles to the CNC-SH ends to form Janus-like colloidal rod sphere adducts. The extent of thiol modification of CNC-SHs is quantified using X-ray photoelectron spectroscopy. The promoted binding of CNC-SHs on gold surfaces is shown by atomic force microscopy and quartz crystal microbalance, where the high dissipation suggests pronounced orientational mobility due to flexible joints at one rod end onto the surfaces. That the joints are flexible is also shown by the bending and realignment of the CNC-SH rods using a receding triple-phase evaporation front of a drying drop of water. The ability of the hairy surface to size-selectively resist particle binding was also investigated."
According to the news editors, the research concluded: "As the CNCs are piezoelectric and allow magnetic functionalization by nanoparticles, we foresee a general platform for nanosized artificial cilia for fluid manipulation and controlled adsorption/desorption."
For more information on this research see: Cilia-Mimetic Hairy Surfaces Based on End-Immobilized Nanocellulose Colloidal Rods. Biomacromolecules, 2013;14(8):2807-2813. Biomacromolecules can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Biomacromolecules - www.pubs.acs.org/journal/bomaf6)
The news correspondents report that additional information may be obtained from A.R. Lokanathan, North Carolina State University, Dept. of Chem & Biomol Engn, Raleigh, NC 27695, United States. Additional authors for this research include A. Nykanen, J. Seitsonen, L.S. Johansson, J. Campbell, O.J. Rojas, O. Ikkala and J. Laine (see also Nanoparticles).
Keywords for this news article include: Raleigh, United States, North Carolina, Nanotechnology, Emerging Technologies, North and Central America
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