By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Science. According to news reporting originating from Boston, Massachusetts, by NewsRx correspondents, research stated, "Tuning the optical properties of suspensions by controlling the orientation and spatial distribution of suspended particles with magnetic fields is an interesting approach to creating magnetically controlled displays, microrheology sensors, and materials with tunable light emission. However, the relatively high concentration of magnetic material required to manipulate these particles very often reduces the optical transmittance of the system."
Our news editors obtained a quote from the research from Northeastern University, "In this study, we describe a simple method of generating particles with magnetically tunable optical properties via sol gel deposition and functionalization of a continuous layer of silica on ultrahigh magnetically responsive (UHMR) alumina microplatelets. UHMR microplatelets with tunable magnetic response in the range of 15-36 G are obtained by the electrostatic adsorption of 2 to 13% of superparamagnetic iron oxide nanoparticles (SPIONs) on the alumina surface. The magnetized platelets are coated with a 20-50 nm layer of SiO2 through the controlled hydrolysis and condensation reactions of tetraethylorthosilicate (TEOS) in an NH3/ethanol mixture. Finally, the silica surface is covalently modified with an organic fluorescent dye by conventional silane chemistry. Because of the anisotropic shape of the particles, control of their orientation and distribution using magnetic fields and field gradients enables easy tuning of the optical properties of the suspension."
According to the news editors, the research concluded: "This strategy allows us to gain both spatial and temporal control over the fluorescence emission from the particle surface, making the multifunctional platelets interesting building blocks for the manipulation of light in colloid-based smart optical devices and sensors."
For more information on this research see: Ultrahigh Magnetically Responsive Microplatelets with Tunable Fluorescence Emission. Langmuir, 2013;29(47):14674-14680. 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 editors report that additional information may be obtained by contacting R. Libanori, Northeastern Univ, Dept. of Mech & Ind Engn, Boston, MA 02115, United States. Additional authors for this research include F.B. Reusch, R.M. Erb and A.R. Studartt (see also Science).
Keywords for this news article include: Boston, Science, Massachusetts, United States, North and Central America
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC