Assembly of magnetically tunable photonic crystals in nonpolar solvents
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United States of America Patent
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Jan 9, 2018
Issued Date -
N/A
app pub date -
Feb 23, 2010
filing date -
Feb 23, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method of assembling superparamagnetic colloids into ordered structures with magnetically tunable photonic properties in nonpolar solvents by establishing long-range electrostatic repulsive forces using charge control agents. Reverse micelles resulted from the introduction of charge control agents such as AOT molecules can enhance the charge separation on the surfaces of n-octadecyltrimethoxysilane modified Fe3O4@SiO2 particles. The significantly improved long-range electrostatic repulsion can counterbalance the magnetically induced attraction and therefore allow ordering of superparamagnetic colloids in nonpolar solvents. This system possesses fast and fully reversible optical response to the external magnetic fields, long-term stability in performance, and good diffraction intensity.
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International Classification(s)
- 2010 Application Filing Year
- C09C Class
- 140 Applications Filed
- 121 Patents Issued To-Date
- 86.43 % Issued To-Date
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- 0 Citation Count
- C09C Class
- 0 % this patent is cited more than
- 7 Age
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