Huaizhi E Geng

US Patent:

7850874, Dec 14, 2010

Filed:

Sep 20, 2007

Appl. No.:

11/903194

Inventors:

Mei Lu - Cary NC, US
Jie Liu - Chapel Hill NC, US
Huaizhi Geng - Cary NC, US
Bo Gao - Elon NC, US

Assignee:

Xintek, Inc. - Research Triangle Park NC

International Classification:

H01B 1/24

US Classification:

252510, 252511, 252502, 977742, 977745, 977748, 977746, 977749

Abstract:

Methods and devices are provided relating to the homogeneous deposition of a composite film of carbon nanotubes by electrophoresis. The methods comprise linking carbon nanotubes to matrix particles prior to electrophoretic deposition. The methods improve the adhesion of the composite film to the substrate and reduce the surface roughness. Carbon nanotube films and electron field emission cathodes fabricated by this process demonstrate enhanced electron field emission characteristics.

US Patent:

20040173378, Sep 9, 2004

Filed:

Dec 9, 2003

Appl. No.:

10/730068

Inventors:

Otto Zhou - Chapel Hill NC, US
Jie Tang - Chapel Hill NC, US
Huaizhi Geng - Carrboro NC, US
Lu-Chang Qin - Chapel Hill NC, US
Jian Zhang - Carrboro NC, US
Guang Yang - Carrboro NC, US

Assignee:

UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL

International Classification:

H05K001/16
H01R043/00
B01D057/02
G01L001/20

US Classification:

174/260000, 174/261000, 029/854000, 029/832000, 204/450000

Abstract:

A method for depositing a nanostructure-containing material onto an object or substrate includes one or more of the following: () forming a solution or suspension of nanostructure-containing material, () selectively adding “chargers” to the solution, () immersing electrodes in the solution, the substrate or object upon which the nanostructure material is to be deposited acting as one of the electrodes, () applying a direct and/or alternating current electrical field between the two electrodes for a certain period of time thereby causing the nanostructure materials in the solution to migrate toward and attach themselves to the substrate electrode, and () subsequent optional processing of the coated substrate. Associated objects and devices are also provided. A method for separating nanostructures based on their properties and/or geometry is also described.

US Patent:

20070007142, Jan 11, 2007

Filed:

Mar 13, 2006

Appl. No.:

11/374386

Inventors:

Otto Zhou - Chapel Hill NC, US
Jie Tang - Chapel Hill NC, US
Huaizhi Geng - Carrboro NC, US
Lu-Chang Qin - Chapel Hill NC, US
Jian Zhang - Carrboro NC, US
Guang Yang - Carrboro NC, US

International Classification:

C25D 1/00

US Classification:

205078000

Abstract:

A method for depositing a nanostructure-containing material onto an object or substrate includes one or more of the following: (1) forming a solution or suspension of nanostructure-containing material, (2) selectively adding “chargers” to the solution, (3) immersing electrodes in the solution, the substrate or object upon which the nanostructure material is to be deposited acting as one of the electrodes, (4) applying a direct and/or alternating current electrical field between the two electrodes for a certain period of time thereby causing the nanostructure materials in the solution to migrate toward and attach themselves to the substrate electrode, and (5) subsequent optional processing of the coated substrate. Associated objects and devices are also provided. A method for separating nanostructures based on their properties and/or geometry is also described.