By a News Reporter-Staff News Editor at Science Letter -- Investigators discuss new findings in Silicon Dioxide. According to news originating from Pessac, France, by NewsRx correspondents, research stated, "A critical advantage of electrostatic assemblies over covalent and crystalline bound materials is that associated structures can be disassembled into their original constituents. Nanoscale devices designed for the controlled release of functional molecules already exploit this property."
Our news journalists obtained a quote from the research from the University of Bordeaux, "To bring some insight into the mechanisms of disassembly and release, we study the disruption of molecular electrostatics-based interactions via competitive binding with ionic surfactants. To this aim, free-standing micrometer-size wires were synthesized using oppositely charged poly(diallyldimethylammonium chloride) and poly(acrylic acid) coated iron oxide nanoparticles. The disassembly is induced by the addition of sodium dodecyl sulfates that complex preferentially the positive polymers. The process is investigated at two different length scales: the length scale of the particles (10 nm) through the quartz crystal microbalance technique and that of the wires (>1 mu m) via optical microscopy. Upon surfactant addition, the disassembly is initiated at the surface of the wires by the release of nanoparticles and by the swelling of the structure."
According to the news editors, the research concluded: "In a second step, erosion involving larger pieces takes over and culminates in the complete dissolution of the wires, confirming the hypothesis of a surface-type swelling and erosion process."
For more information on this research see: Surfactant-Triggered Disassembly of Electrostatic Complexes Probed at Optical and Quartz Crystal Microbalance Length Scales. Langmuir, 2014;30(19):5620-5627. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)
The news correspondents report that additional information may be obtained from N. Schonbeck, Univ Bordeaux, CNRS, Center Rech Paul Pascal CRPP, UPR 8641, F-33600 Pessac, France. Additional authors for this research include K. Kvale, T. Demarcy, J. Giermanska, J.P. Chapel and J.F. Berret (see also Silicon Dioxide).
Keywords for this news article include: Pessac, France, Europe, Quartz, Nanoparticle, Nanotechnology, Silicon Dioxide, Emerging Technologies
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