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Magnetic Porous Silicon Photonic Crystal

Technology Application

Possible application areas include MEMS devices, microfluidic mixing, targeted drug/enzyme delivery, biological screening, and microfluidic tagging.

Detailed Technology Description

University researchers have demonstrated magnetically switchable micron-sized photonic crystals that can be induced to flip between a colored photonic crystal face and a black, non-reflective surface in an oscillating magnetic field at rates exceeding 175 Hz. This property makes this an excellent material for use in display applications. In addition, magnetic "smart dust" has now been constructed with amphiphilic properties. This allows the micron-size crystals to self-align at the interface between immiscible liquids and effectively encapsulate suspended droplets. The addition of the magnetic property means that the particles can be used to manipulate microliter-scale droplets or cells by the application of an electromagnetic field, without the addition of ions or other impurities to the bulk liquid.

Supplementary Information

Patent Number: US8097173B2
Application Number: US2006632914A
Inventor: Sailor, Michael J. | Li, Yang Yang | Trujillo, Nathan | Dorvee, Jason
Priority Date: 19 Jul 2004
Priority Number: US8097173B2
Application Date: 18 Jan 2007
Publication Date: 17 Jan 2012
IPC Current: C23F000100 | B29D001100 | B32B000516 | B32B001500 | B44C000122
US Class: 216002 | 216022 | 216024 | 216056 | 428357 | 428402 | 428403 | 4286921 | 977838 | 977960 | 977962
Assignee Applicant: The Regents of the University of California
Title: Magnetic porous particles and method of making
Usefulness: Magnetic porous particles and method of making
Summary: Used in the fabrication of magnetic porous particles used to control, move, and/or deliver small volumes of liquids and solids associated with the particles, preferably useful in the field of display devices (claimed).
Novelty: Fabrication of magnetic porous particles used to control, move, and/or deliver small volumes of liquids comprises etching substrate to create film having porous photonic structure, dividing film into particles, and magnetizing film

Industry

Chemical/Material

Sub Category

Chemical/Material Application

Application No.

8097173

Others

Intellectual Property Info

This technology is presently available for licensing.

Related Materials

Visit http://chem-faculty.ucsd.edu/sailor/research for additional information about the inventor and his work.

Tech ID/UC Case

19916/2004-206-0

Related Cases

2004-206-0, 2004-270-1

*Abstract

Porous silicon (PSi) is a particularly attractive material for biological and high-tech applications because of the ease with which the optical properties, pore size, and surface chemistry can be manipulated. The position, width and intensity of spectral reflectivity peaks are controlled by current density, waveform and solution composition used in the electrochemical etch. This allows the preparation of PSi photonic crystals that can display any number of colors within the visible spectrum with high color saturation and resolution, highly desirable features for information display. Researchers at UC San Diego have converted these films into micron-sized particles (so-called “smart dust”, described in: Link and Sailor, Smart Dust: Self-assembling, self-orienting photonic crystals of porous Si.; Proc. Nat. Acad. Sci., 2003, 100 (19): p.10607-10610).

*IP Issue Date

Jan 17, 2012

*Principal Investigator

Name: Jason Dorvee

Department:

Name: Yang Yang Li

Department:

Name: Michael Sailor

Department:

Name: Nathan Trujillo

Department:

Country/Region

USA