Lu L Zhang

US Patent:

7217407, May 15, 2007

Filed:

Sep 3, 2004

Appl. No.:

10/933557

Inventors:

Lu Zhang - Newark DE, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C01B 13/20
C01B 13/22
C01G 23/00

US Classification:

423610, 423611, 423612, 423613, 423DIG 10, 204164, 977773, 977775, 977777, 977811

Abstract:

The present invention is a method of increasing particle surface area and decreasing the concentration of over-sized particles in a process for making metal oxide particles, particularly nanoparticle TiO, in an inlet-fed, plug flow, plasma reactor by vapor phase reaction of titanium tetrachloride and oxygen in the presence of a source of hydrogen to form titanium dioxide particles.

US Patent:

7771666, Aug 10, 2010

Filed:

Dec 16, 2003

Appl. No.:

10/537042

Inventors:

Stephan Claude De La Veaux - Wilmington DE, US
Lu Zhang - Newark DE, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

B01J 12/00
C09C 1/00
C01G 23/047

US Classification:

422129, 422150, 422151, 422158, 423612

Abstract:

The present invention provides a method and apparatus for the controlled synthesis of nanoparticles using a high temperature process. The reactor chamber includes a high temperature gas heated by means such as a plasma torch, and a reaction chamber. The homogenizer includes a region between the reactant inlets and the plasma (the spacer zone) to ensure that feeds from the reactant inlets are downstream of the recirculation zone induced by the high temperature gas. It also includes a region downstream of the reactant inlets that provides a nearly I dimensional (varying only in the axial direction) flow and concentration profile in the reaction zone to produce nanoparticles with narrow size distribution.

US Patent:

20050119398, Jun 2, 2005

Filed:

Sep 3, 2004

Appl. No.:

10/933792

Inventors:

Lu Zhang - Newark DE, US

International Classification:

B01J023/00
C01B013/14
C01C001/00
C01D001/02
C01B013/00
C01G057/00
C01G023/047
C08K003/22

US Classification:

524497000, 423610000, 502350000, 423592100, 423593100, 106436000, 106437000, 051309000

Abstract:

A process for minimizing and even eliminating over-sized particles in a vapor phase synthesis of metal oxide-containing particles comprising reacting oxygen with one of more vapor streams comprising a titanium halide, a silicon halide and a compound selected from the group consisting of phosphorous, germanium, boron, tin, niobium, chromium, silver, gold, palladium aluminum, and mixtures thereof in a plug flow, plasma reactor.

US Patent:

20060142419, Jun 29, 2006

Filed:

Oct 14, 2005

Appl. No.:

11/251259

Inventors:

Jingjing Xu - Wilmington DE, US
Charles Molnar - Wilmington DE, US
Shekhar Subramoney - Hockessin DE, US
Michael Crawford - Glen Mills PA, US
John Gergely - Avondale PA, US
Lu Zhang - Midlothian VA, US
Edwin Marston - Wilmington DE, US

International Classification:

C09D 11/00
C09D 5/00

US Classification:

523161000, 977900000

Abstract:

The present invention is a dispersion composition comprising (1) a curable mixture of monomers, oligomers, or a combination thereof; and (2) superparamagnetic particles dispersed in the mixture of part (1) and a method for preparing such superparamagnetic particles. The composition of the present invention can be useful as a tool for detecting and/or deterring theft, counterfeiting, or the like in commercial transactions.

US Patent:

20070085053, Apr 19, 2007

Filed:

Oct 14, 2005

Appl. No.:

11/250336

Inventors:

John Gergely - Avondale PA, US
Edwin Marston - Wilmington DE, US
Shekhar Subramoney - Hockessin DE, US
Lu Zhang - Midlothian VA, US

International Classification:

C01G 49/08

US Classification:

252062560, 977900000

Abstract:

A process for preparing superparamagnetic transition metal nanoparticles by introducing into a gas stream a hydrocarbon and a transition metal carboxyl wherein the transition metal carbonyl is introduced downstream from the hydrocarbon; wherein at the point of introduction of the hydrocarbon the gas stream is in the form of a plasma, and wherein at the point of introduction of the transition metal carbonyl the gas stream is at a temperature of at least 1000 C.; followed by quenching to form carbon-coated transition metal nanoparticles; and wherein the gas stream consists essentially of at least one inert gas and hydrogen.

US Patent:

20100072430, Mar 25, 2010

Filed:

May 5, 2006

Appl. No.:

11/418903

Inventors:

John S. Gergely - Avondale PA, US
Edwin S. Marston - Wilmington DE, US
Shekhar Subramoney - Hockessin DE, US
Lu Zhang - Midlothian VA, US

International Classification:

H01B 1/04
H01B 1/02
B01J 19/12

US Classification:

252504, 252502, 252506, 20415763, 977755

Abstract:

This invention relates to free-flowing compositions of carbon nanosheets and core-shell particles, and to a plasma-torch process for making them.