Patent · US Active

Assembly of magnetically tunable photonic crystals in nonpolar solvents

US9862831B2 · kind B2 · utility

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2References

19Claims

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Assignee

The Regents of the University of California · US

Inventors

Yadong Yin · Nanhu, CN
Jianping Ge · Shanghai, CN

Key dates

Filing date	Feb 23, 2010
Grant date	Jan 9, 2018
Priority date	—
Expiry date	Jun 7, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/42
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.