Layered inorganic with pillared organic nanocomposite actuators

• US 7,274,128 B1
• Filed: 01/20/2005
• Issued: 09/25/2007
• Est. Priority Date: 01/20/2005
• Status: Expired due to Fees

• Current Assignee: HRL Laboratories LLC (The Boeing Co.)
• Original Assignee: HRL Laboratories LLC (The Boeing Co.)
• Inventors: McKnight, Geoffrey P., Liu, Ping, Jacobsen, Alan J., Massey, Cameron, Momoda, Leslie
• Primary Examiner(s): PERT, EVAN T
• Application Number:
  US11/038,905
• Time in Patent Office: 978 Days
• Field of Search: 310/300
• US Class Current: 310/300
• CPC Class Codes: F03G 7/012 Electro-chemical actuators
• CPC Class Codes: F03G 7/05 Ocean thermal energy conversion, i.e. OTEC
• CPC Class Codes: Y02E 10/30 Energy from the sea, e.g. using wave energy or salinity gradient

Abstract

One nanostructured actuator embodiment includes an actuation region between electrical contacts. The actuation region includes an elastic matrix with embedded nanocomposite layered structures, which have inorganic material layers with pillared organic material structures between the inorganic material layers responsive to the surface acidity of the inorganic material layers. The elastic matrix allows transport of species for changing the surface acidity. A separator region is between the electrical contacts. A proton generation region capable of reversible electrochemical production and elimination of protons is provided, which may be a hydrogen storage material located on a side of the separator region opposite the actuation region, which may include metal hydride, or metal hydroxide. Alternatively, it may include an electrolytic solution and conductive particles within the elastic matrix for in situ electrochemical generation of an acid/base. The conductive particles may include carbon nanotubes, metal fibers, and/or metal nanoparticles. The nanocomposite structures may be generally aligned with a direction of work in the elastic matrix.

Claims

1. A nanostructured actuator comprising:

a) electrical contacts;

b) an actuation region between the electrical contacts, the actuation region comprising;

(i) a plurality of nanocomposite layered structures each comprising;

(1) inorganic material layers having surface acidity; and

(2) pillared organic material structures between the inorganic material layers, the pillared organic material structures having an orientation responsive to a change in the surface acidity of adjacent inorganic material layers; and

(ii) an elastic matrix holding the plurality of nanocomposite layered structures embedded within, the elastic matrix being adapted to allow transport of chemical species capable of changing the surface acidity of the inorganic material layers;

c) a separator region between the electrical contacts; and

d) a proton generation region between the electrical contacts capable of reversible electrochemical production and elimination of protons.

2. The actuator of claim 1 wherein the proton generation region comprises a hydrogen storage material located on a side of the separator region opposite the actuation region and located between one of the electrical contacts and the separator region.

3. The actuator of claim 2 wherein the proton generation region comprises metal hydride.

4. The actuator of claim 2 wherein the proton generation region comprises metal hydroxide.

5. The actuator of claim 1 wherein the proton generation region comprises:

a) an electrolytic solution within the elastic matrix; and

b) electrically conductive particles embedded within the elastic matrix so as to be capable of electrochemical generation of at least one of an acid or a base from the electrolytic solution.

6. The actuator of claim 5 wherein the conductive particles comprise at least one of:

(a) carbon nanotubes;

(b) metal fibers;

or (c) metal nanoparticles.

7. The actuator of claim 6 wherein the electrolytic solution comprises a salt.

8. The actuator of claim 7 wherein the electrolytic solution comprises Na₂SO₄.

9. The actuator of claim 1 wherein each of the plurality of nanocomposite layered structures have a direction of work, and wherein the plurality of nanocomposite layered structures are oriented such that the direction of work of each of the plurality of nanocomposite layered structures is facing in a substantially similar direction.

10. The actuator of claim 1 wherein the inorganic material layers form planes, and wherein the plurality of nanocomposite layered structures are oriented such that the planes of the inorganic material layers are generally facing in a substantially same direction.

11. The actuator of claim 1 wherein the elastic matrix comprises an ion conducting polymer.

12. The actuator of claim 11 wherein the elastic matrix comprises one of:

(a) Nafion;

or (b) polyaryletherketone.

13. The actuator of claim 1 wherein the inorganic material layers are comprised of γ

-zirconium phosphate.

14. The actuator of claim 13 wherein the pillared organic material structures comprise polyethylenoxide.

15. The actuator of claim 1 wherein the inorganic material layers comprise one of:

(a) silicate;

(b) double oxides, (c) aluminum phosphate;

or (d) vanadium oxide.

16. The actuator of claim 1 wherein the pillared organic material structures comprise molecular chains of ethylene glycol.

17. The actuator of claim 1 wherein the separator comprises a porous polymer membrane impregnated with an aqueous electrolyte solution.

18. The actuator of claim 1 wherein the proton generation region comprises electrically conductive portions within an electrolytic solution so as to be capable of electrochemical production and elimination of protons within the electrolytic solution, the electrolytic solution surrounding the each of the plurality of nanocomposite layered structures so as to be capable of transporting ions between the conductive portions and the plurality of nanocomposite layered structures for changing the surface acidity of the inorganic material layers.

19. A nanostructured actuator comprising:

a) electrical contacts;

b) an actuation region comprising;

(i) a nanocomposite layered structure between the electrical contacts comprising;

(1) inorganic material layers having surface acidity; and

(2) organic material chains linked between the inorganic material layers such that the organic material chains rotate in response to a change in the surface acidity of adjacent inorganic material layers; and

(ii) an ion conducting matrix the nanocomposite layered structure being embedded within the ion conducting matrix, the ion conducting matrix being adapted to allow transport of chemical species capable of changing the surface acidity of the inorganic material layers;

c) a separator region between the electrical contacts; and

d) a region between the electrical contacts capable of reversible electrochemical production and elimination of chemical species capable of changing the surface acidity of the inorganic material layers.

20. The actuator of claim 19 wherein the region between the electrical contacts capable of reversible electrochemical production and elimination of chemical species comprises electrical conducting particles embedded within the ion conducting matrix so as to be capable of in situ electrochemical generation of at least one of an acid or a base.

21. The actuator of claim 19 wherein the region between the electrical contacts capable of reversible electrochemical production and elimination of chemical species comprises at least one of a metal hydride region or a metal hydroxide region located between the electrical contacts.

22. The actuator of claim 19 wherein the inorganic material layers comprise one of:

(a) zirconium phosphate;

(b) silicate;

(c) double oxides, (d) aluminum phosphate;

or (e) vanadium oxide.

23. The actuator of claim 19 wherein the nanocomposite layered structure comprises γ

-zirconium phosphate layers and molecular chains comprising ethylene glycol.

24. A nanostructured actuator comprising:

a) electrical contacts;

b) an actuation region between the electrical contacts, the actuation region comprising;

(i) a plurality of nanocomposite layered structures comprising;

(1) inorganic material layers having surface acidity; and

(2) pillared organic material structures linked between the layered inorganic material, the pillared organic material structures having an orientation responsive to a change in the surface acidity of adjacent inorganic material layers;

(ii) an elastic matrix holding the plurality of nanocomposite layered structures embedded within, the elastic matrix being adapted to allow transport of chemical species capable of changing the surface acidity of the inorganic material layers; and

(iii) the plurality of nanocomposite layered structures being generally aligned within the elastic matrix so as to be capable of providing displacement along a direction of work;

c) a hydrogen storage region located between the electrical contacts, the hydrogen storage region being capable of reversible production and elimination of protons in response to electrical signals across the hydrogen storage region; and

d) a separator region between the actuation and the hydrogen storage region.

25. The actuator of claim 24 wherein the hydrogen storage region comprises at least one of:

(a) metal hydride;

or (b) metal hydroxide.

26. The actuator of claim 25 wherein the plurality of nanocomposite layered structures comprise γ

-zirconium phosphate layers and polyethylenoxide chains between the γ

-zirconium phosphate layers.

27. The actuator of claim 24 wherein the inorganic material layers comprise one of:

(a) zirconium phosphate;

(b) silicate;

(c) double oxides, (d) aluminum phosphate;

or (e) vanadium oxide.

28. A nanostructured actuator comprising:

a) electrical contacts;

b) an actuation region between the electrical contacts, the actuation region comprising;

(i) a plurality of nanocomposite layered structures comprising;

(1) inorganic material layers having surface acidity; and

(2) pillared organic material structures linked between the layered inorganic material, the pillared organic material structures having an orientation responsive to a change in the surface acidity of adjacent inorganic material layers;

(ii) an elastic matrix holding the plurality of layered nanocomposite structures embedded within, the elastic matrix including a chemical compound capable of dissociation to proved chemical species capable of changing the surface acidity of the inorganic material layers, the elastic matrix being adapted to allow transport of the chemical species;

(iii) electrically conductive particles embedded within the elastic matrix; and

(iv) the plurality of nanocomposite layered structures being generally aligned within the elastic matrix so as to be capable of providing displacement along a direction of work; and

c) a separator region between the actuation region and one of the electrical contacts.

29. The actuator of claim 28 wherein the conductive particles comprise at least one of:

(a) carbon nanotubes;

(b) metal fibers;

or (c) metal nanoparticles.

30. The actuator of claim 29 wherein the plurality of nanocomposite layered structures comprise γ

-zirconium phosphate layers and polyethylenoxide chains between the γ

-zirconium phosphate layers.

31. The actuator of claim 29 wherein the inorganic material layers comprise one of:

(a) zirconium phosphate;

(b) silicate;

(c) double oxides, (d) aluminum phosphate;

or (e) vanadium oxide.

32. A nanostructured actuator comprising:

a) electrical contacts;

b) an actuation region between the electrical contacts, the actuation region comprising;

(i) a plurality of nanocomposite layered pieces each comprising;

(1) inorganic material layers having surface acidity; and

(2) pillared organic material structures between the inorganic material layers, the pillared organic material structures having an orientation responsive to a change in the surface acidity of adjacent inorganic material layers;

(ii) an elastic matrix holding the plurality of nanocomposite layered pieces embedded within, the elastic matrix being adapted to allow transport of chemical species capable of changing the surface acidity of the inorganic material layers; and

(iii) the plurality of nanocomposite layered pieces being generally aligned within the elastic matrix so as to be capable of providing displacement along a direction of work;

c) a separator region between the electrical contacts; and

d) a region between the electrical contacts capable of reversible electrochemical production and elimination of chemical species capable of changing the surface acidity of the inorganic material layers.

33. The actuator of claim 32 wherein the plurality of nanocomposite layered pieces comprise γ

-zirconium phosphate layers and polyethylenoxide chains between the γ

-zirconium phosphate layers.

34. The actuator of claim 32 wherein the inorganic material layers comprise one of:

(a) zirconium phosphate;

(b) silicate;

(c) double oxides, (d) aluminum phosphate;

or (e) vanadium oxide.

35. A nanostructured actuator comprising:

a) a nanocomposite layered structure comprising;

(i) inorganic material layers having surface acidity; and

(ii) organic material chains linked between the inorganic material layers such that the organic material chains rotate in response to a change in the surface acidity of adjacent inorganic material layers; and

b) a porous elastic matrix, the nanocomposite layered structure being embedded within porous elastic matrix, the porous elastic matrix being adapted to allow introduction and transport of chemical species capable of changing the surface acidity of the inorganic material layers.

36. The actuator of claim 35 further comprising a supply apparatus capable of supplying at least one of an acidic solution or a basic solution under pressure to the nanocomposite layered structure.

37. The actuator of claim 36 wherein the inorganic material layers comprise one of:

(a) zirconium phosphate;

(b) silicate;

(c) double oxides, (d) aluminum phosphate;

or (e) vanadium oxide.

38. The actuator of claim 36 wherein the nanocomposite layered structure comprises γ

-zirconium phosphate layers and molecular chains comprising ethylene glycol.