Rapid Heating With Nanoenergetic Materials

• US 20090221135A1
• Filed: 10/27/2006
• Published: 09/03/2009
• Est. Priority Date: 10/28/2005
• Status: Active Grant

• Current Assignee: Curators of the University of Missouri (University of Missouri)
• Original Assignee: Curators of the University of Missouri (University of Missouri)
• Inventors: Gangopadhyay, Keshab, Gangopadhyay, Shubhra, Hossain, Maruf, Shende, Rajesh
• Granted Patent: US 7,879,721 B2
• Time in Patent Office: Days
• US Class Current: 438/486
• CPC Class Codes: C06B 45/14 a layer or zone containing an inorganic explosive or an inorganic explosive or an inorganic thermic component
• CPC Class Codes: H10N 10/13 characterised by the heat-exchanging means at the junction

Abstract

The present process for rapidly heating and cooling a target material without damaging the substrate upon which it has been deposited. More specifically, target material is coated onto a first substrate. A self-propagating nanoenergetic material is selected that combusts at temperatures sufficient to change the target material and creates a flame front that propagates sufficiently quickly that the first substrate is not substantially heated. The nanoenergetic material is deposited on the target material, such that the target material and the nanoenergetic material is sandwiched between the substrate and the target material. The nanoenergetic material is ignited and the flame front of the nanoenergetic material is allowed to propagate over the second substrate and change the target material.

Claims

1. A method of rapidly heating and cooling a target material comprising:

depositing a target material on a first substrate;

selecting a self-propagating nanoenergetic material that combusts at temperatures sufficient to change the target material and creates a flame front that propagates sufficiently quickly that the first substrate is not substantially heated;

depositing the nanoenergetic material on the second substrate;

positioning the first substrate and the second substrate such that the target material is heated by the nanoenergetic material sufficient to change it;

igniting the nanoenergetic material;

allowing the flame front of the nanoenergetic material to propagate over the second substrate and change the target material.

2. The method of claim 1 wherein said first depositing step comprises coating the first substrate with a target material, sputtering the target material onto the first substrate or spreading the target material in the first substrate.

3. The method of claim 1 wherein said igniting step comprises activating one or more of the group consisting of electrodes and thin film resistance heaters.

4. The method of claim 3 wherein said electrode comprises platinum.

5. The method of claim 1 wherein the change in the target material comprises crystallizing, alloying or doping the target material.

6. The method of claim 1 wherein said second depositing step comprises self-assembly of the nanoenergetic material on the surface of the second substrate.

7. The method of claim 1 wherein the change in the target material is crystallization.

8. The method of claim 7 wherein the target material is carbon or silicon.

9. The method of claim 7 wherein the first substrate is at least one of the group consisting of glass and plastic.

10. The method of claim 7 wherein the nanoenergetic material is thermite.

11. The method of claim 1 wherein the change in the target material is alloying the target material with an alloying metal.

12. The method of claim 11 further comprising depositing a layer of an alloying metal on the target material.

13. The method of claim 12 wherein at least one of the at least two metals is selected from the group consisting of platinum and aluminum.

14. The method of claim 11 wherein the nanoenergetic material is thermite.

15. The method of claim 1 wherein the change in the target material is doping of the target material with a dopant.

16. The method of claim 15 wherein the target material is selected from the group consisting of gallium arsenide, silicon and germanium.

17. The method of claim 15 wherein the dopant is selected from the group consisting of boron, phosphorus, arsenic and antimony.

18. The method of claim 15 wherein the nanoenergetic material is thermite.

19. The method of claim 1 wherein the nanoenergetic material is patterned on a second substrate.

20. The method of claim 1 wherein the change in the target material in the selecting step is a phase change;

and the target material is at least one of the group consisting of graphite, carbon nanotubes and fullerenes.

21. The method of claim 1 wherein the nanoenergetic material is a mixture of at least two of nanorods, nanowells and nanospheres.