Nanostructure based microfluidic pumping apparatus, method and printing device including same

• US 20040113980A1
• Filed: 12/12/2002
• Published: 06/17/2004
• Est. Priority Date: 12/12/2002
• Status: Active Grant

• Current Assignee: Brother International Corporation (Brother Industries Limited)
• Original Assignee: Brother International Corporation (Brother Industries Limited)
• Inventors: Mohamadinejad, Habib, Lewis, Howard
• Granted Patent: US 7,001,013 B2
• Time in Patent Office: Days
• US Class Current: 347/54
• CPC Class Codes: B41J 2/14 Structure thereof only for on-demand ink jet heads
• CPC Class Codes: Y10S 977/725 Nanomotor/nanoactuator
• CPC Class Codes: Y10S 977/902 Specified use of nanostructure

Abstract

A microfluidic actuator suitable for effecting drop on demand inkjet printing by ejecting fluid through at least one nozzle from at least one cavity being at least partially formed by a deflectable membrane, the actuator including: an actuator chamber operatively coupled to the membrane and containing at least on electrolytic fluid; and, at least one nanostructure contained in the electrolytic fluid; and, wherein, the nanostructure is adapted to deflect toward the membrane in response to an operating voltage being applied to at least the nanostructure thereby deflecting the membrane and causing the fluid to be ejected through the nozzle.

Claims

1. A microfluidic pumping device suitable for effecting inkjet printing by ejecting fluid through at least one nozzle in response to activation of a deflectable membrane, said device comprising:

an actuator operatively coupled to said membrane and containing at least one electrolytic fluid; and

,

at least one nanostructure contained in said electrolytic fluid;

wherein, said nanostructure is adapted to deflect toward said membrane in response to an operating voltage being applied to at least said nanostructure thereby deflecting said membrane and causing said fluid to be ejected through said nozzle.

2. The device of claim 1, wherein said actuator forms an actuator chamber containing said electrolytic fluid.

3. The device of claim 1, wherein said nozzle partially forms a cavity with at least one opening.

4. The device of claim 1, wherein said nozzle comprises a plurality of nozzles.

5. The device of claim 4, wherein said actuator forms a plurality of actuator chambers each associated with a corresponding one of said plurality of nozzles.

6. The device of claim 1, wherein said fluid has a surface tension across said nozzle substantially restricting flow of said fluid through said nozzle except in response to deflection of said membrane.

7. The device of claim 1, wherein said fluid comprises ink.

8. The device of claim 1, wherein said fluid comprises a colloidal solution.

9. The device of claim 1, wherein said membrane comprises steel.

10. The device of claim 1, wherein said membrane comprises at least one polymeric material.

11. The device of claim 1, wherein said membrane is coated with a polytetrafluoroethylene material.

12. The device of claim 1, wherein said electrolytic fluid comprises an electrolytic solution.

13. The device of claim 12, wherein said electrolytic solution comprises at least one material selected from the group consisting of NaCl, MgCl2, NaOH, LiNO3, and Al2(SO4)3.

14. The device of claim 1, further comprising at least one electrode being electrically coupled to at least one corresponding nanostructure.

15. The device of claim 14, further comprising at least one controller operatively coupled to each said electrode for selectively providing a voltage thereon being suitable for at least partially effecting said nanostructure deflection.

16. The device of claim 1, wherein said at least one nanostructure comprises a plurality of carbon nanotubes having at least one substantially non-conductive material interposed there between.

17. The device of claim 16, wherein said at least one substantially non-conductive material comprises KOH2.

18. The device of claim 1, wherein said at least one nanostructure comprises at least one film of carbon nanotubes.

19. The device of claim 1, wherein said at least one nanostructure comprises at least two films of carbon nanotubes having at least one substantially non-conductive material interposed there between.

20. The device of claim 1, wherein said at least one nanostructure comprises at least one self-oriented array of carbon nanotubes.

21. The device of claim 1, wherein said at least on nanostructure comprises a plurality of single wall carbon nanotubes.

22. The device of claim 1, wherein said electrolytic fluid comprises an ionic compound.

23. The device of claim 22, wherein said ionic compound is water soluble.

24. The device of claim 1, wherein said deflection of said at least one nanostructure is at least partially dependent upon quantum based effects.

25. The device of claim 1, wherein said deflection of said at least one nanostructure is at least partially dependent upon electrostatic effects.

26. A microfluidic pumping device suitable for effecting inkjet printing by ejecting fluid through at least one nozzle in response to activation of a deflectable membrane, said device comprising:

an actuator operatively coupled to said membrane;

at least one nanostructure contained in said actuator; and

, means for forming a double layer charge when an operating voltage is applied to said at least one nanostructure;

wherein, said nanostructure is adapted to deflect toward said membrane in response to said double layer charge thereby deflecting said membrane and causing said fluid to be ejected through said nozzle.

27. The device of claim 26, wherein said means for forming a double layer charge comprises doping of said at least one nanostructure.

28. The device of claim 26, wherein said actuator forms at least one actuator chamber.

29. The device of claim 26, wherein said wherein said nozzle partially forms a cavity having at least one opening.

30. The device of claim 26, wherein said nozzles comprises a plurality of nozzles.

31. The device of claim 26, wherein said actuator forms a plurality of actuator chambers each associated with a corresponding one of said plurality of nozzles.

32. The device of claim 26, wherein said fluid has a surface tension across said nozzle substantially restricting flow of said fluid through said nozzle except in response to deflection of said membrane.

33. The device of claim 26, wherein said fluid comprises ink.

34. The device of claim 26, wherein said fluid comprises a colloidal solution.

35. The device of claim 26, wherein said membrane comprises steel.

36. The device of claim 26, wherein said membrane comprises at least one polymeric material. 501014.20003

37. The device of claim 26, wherein said membrane is coated with a polytetrafluoroethylene material.

38. The device of claim 26, wherein said means for forming a double layer charge comprises at least one electrolytic solution.

39. The device of claim 38, wherein said electrolytic solution comprises at least one material selected from the group consisting of NaCl, MgCl2, NaOH, LiNO3, and Al2(SO4)3.

40. The device of claim 26, further comprising at least one electrode each being electrically coupled to at least one corresponding nanostructure.

41. The device of claim 40, further comprising at least one controller operatively coupled to each said electrode for selectively providing a voltage thereon being suitable for at least partially effecting said nanostructure deflection.

42. The device of claim 26, wherein said at least one nanostructure comprises a plurality of carbon nanotubes having at least one substantially non-conductive material interposed there between.

43. The device of claim 42, wherein said at least one substantially non-conductive material comprises KOH2.

44. The device of claim 26, wherein said at least one nanostructure comprises at least one film of carbon nanotubes.

45. The device of claim 26, wherein said at least one nanostructure comprises at least two films of carbon nanotubes having at least one substantially non-conductive material interposed there between.

46. The device of claim 26, wherein said at least one nanostructure comprises at least one self-oriented array of carbon nanotubes.

47. The device of claim 26, wherein said at least one nanostructure comprises a plurality of single wall carbon nanotubes.

48. The device of claim 26, wherein said means for forming a double layer charge comprises an ionic compound.

49. The device of claim 48, wherein said ionic compound is water soluble.

50. The device of claim 26, wherein said deflection of said at least one nanostructure is at least partially dependent upon quantum based effects.

51. The device of claim 26, wherein said deflection of said at least one nanostructure is at least partially dependent upon electrostatic effects.

52. A method for effecting inkjet printing by ejecting fluid through at least one nozzle in response to activation of a deflectable membrane, said method comprising the step of applying a sufficient voltage to form a double layer charge on at least one nanostructure sufficient to cause enough deformation of said at least one nanostructure to deflect said membrane thereby ejecting said fluid through said nozzle.

53. A device being suitable for printing a predetermined image on a substrate, said device comprising an array of inkjet nozzles suitable for applying ink to said substrate in said predetermined pattern, wherein each of said nozzles has associated therewith:

at least one deflectable membrane;

an actuator operatively coupled to said membrane and containing at least one electrolytic material; and

,

at least one nanostructure electrically coupled to said electrolytic material;

wherein, said nanostructure is adapted to deflect in response to an operating voltage being applied to at least said nanostructure thereby deflecting said membrane and causing said ink to be ejected through said associated nozzle.

54. The device of claim 53, wherein said actuator forms an actuator chamber containing said electrolytic material.

55. The device of claim 54, wherein said actuator forms a plurality of actuator chambers each associated with a corresponding one of said plurality of nozzles.

56. The device of claim 53, wherein said fluid has a surface tension across said nozzle substantially restricting flow of said fluid through said nozzle except in response to deflection of said membrane.

57. The device of claim 53, wherein said membrane comprises at least one of steel, a polymeric material and a material coated with a polytetrafluoroethylene material.

58. The device of claim 53, wherein said electrolytic material comprises at least one material selected from the group consisting essentially of NaCl, MgCl2, NaOH, LiNO3, and Al2(SO4)3.

59. The device of claim 53, further comprising at least one electrode being electrically coupled to at least one corresponding nanostructure.

60. The device of claim 59, further comprising at least one controller operatively coupled to each said electrode for selectively providing a voltage thereon being suitable for at least partially effecting said nanostructure deflection.

61. The device of claim 53, wherein said at least one nanostructure comprises a plurality of carbon nanotubes having at least one substantially non-conductive material interposed there between.

62. The device of claim 61, wherein said at least one substantially non-conductive material comprises KOH2.

63. The device of claim 53, wherein said at least one nanostructure comprises at least one film of carbon nanotubes.

64. The device of claim 53, wherein said at least one nanostructure comprises at least two films of carbon nanotubes having at least one substantially non-conductive material interposed there between.

65. The device of claim 53, wherein said at least one nanostructure comprises at least one self-oriented array of carbon nanotubes.

66. The device of claim 53, wherein said at least on nanostructure comprises a plurality of single wall carbon nanotubes.

67. The device of claim 66, wherein said electrolytic material comprises an ionic compound.

68. The device of claim 53, wherein said deflection of said at least one nanostructure is at least partially dependent upon quantum based effects.

69. The device of claim 53, wherein said deflection of said at least one nanostructure is at least partially dependent upon electrostatic effects.

70. A device suitable for ejecting fluid from an area substantially adjacent to a deflectable membrane, said device comprising:

an actuator operatively coupled to said membrane and containing at least one electrolytic fluid; and

,

at least one nanostructure contained in said electrolytic fluid;

wherein, said nanostructure is adapted to deflect toward said membrane in response to an operating voltage being applied to said at least one nanostructure thereby deflecting said membrane and causing said fluid to be ejected from said space.