|United States Of America||Issued Patent||9,862,831||01/09/2018||2009-502|
Field-responsive photonic structures have important applications in areas such as color display units, biological and chemical sensors, and active optical components. The key to a successful assembly and large tunability in photonic property is establishing long-range repulsive and attractive interactions that can cooperate to order the particles into periodic structures.
Practical applications often require the use of nonaqueous solvents to achieve long-term stability and improved compatibility with device fabrication processes.
Inventors at UCR have been able to successfully achieve the large tunability in photonic property. By introducing charge control agents (AOT) in nonpolar solvents to reduce the energy barrier of charge separation, and thus creating long-range electrostatic repulsive interactions that can counteract the magnetic attraction to allow ordering of superparamagnetic colloids.
(a, b) Reflection spectra of a 1.5 mL DCB solution containing 167-nm (103/32-nm) Fe3O4@SiO2 particles and (a) 0 mg and (b) 1 mg of AOT in response to an external magnetic field with varying strengths, respectively. (c, d) Dependence of (c) diffraction wavelength and (d) intensity upon the AOT concentration in magnetic fields with five different strengths.
Please see the portfolio of inventions by Prof. Yadong Yin at UCR.
Colloidal crystals, Displays, Inks, Biosensors, Chemical sensors, Color displays, Active optical components