公开(公告)号：US11785856B2

公开(公告)日：2023-10-10

申请号：US16481023

申请日：2018-01-26

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE

Inventor： Zi Chen ,  John X. J. Zhang ,  Lin Dong ,  Zhe Xu

IPC: H10N30/30 ,  A61N1/378 ,  H02N2/18 ,  H10N30/857

CPC classification number: H10N30/306 ,  A61N1/3785 ,  H02N2/186 ,  H10N30/857

Abstract: A piezoelectric energy harvester has a layered structure comprising a first electrode, a polymeric piezoelectric material, and a second electrode, the layered structure coupled to receive mechanical stress from the environment, and the first and second electrode electrically coupled to a power converter. The power converter is adapted to charge an energy storage device selected from a capacitor and a battery. The method of harvesting energy from the environment includes providing a piezoelectric device comprising a layer of a polymeric piezoelectric material disposed between a first and a second electrode; coupling mechanical stress derived from an environment to the piezoelectric device; and coupling electrical energy from the piezoelectric device.

公开(公告)号：US11969554B2

公开(公告)日：2024-04-30

申请号：US17092827

申请日：2020-11-09

Applicant: The Trustees of Dartmouth College ,  FACEBOOK, INC.

Inventor： Zi Chen ,  John X. J. Zhang ,  Frances Lau ,  Ali Israr

IPC: H10N30/857 ,  A61F2/70 ,  A61M21/00 ,  B06B1/02 ,  B06B1/06 ,  A61F2/54 ,  A61F2/68

CPC classification number: A61M21/00 ,  A61F2/70 ,  B06B1/0238 ,  B06B1/0688 ,  H10N30/857 ,  A61F2002/543 ,  A61F2002/6827 ,  A61M2021/0022 ,  A61M2205/0294 ,  B06B2201/55 ,  B06B2201/76

Abstract: A haptic stimulator includes a multilayer sheet with a piezoelectric or electroactive polymer layer adapted to mechanically deform upon application of voltage, the multilayer sheet secured to a substrate, and a source of electrical stimulation coupled to drive electrodes on the polymer layer with an AC signal to vibrate the polymer layer. In particular embodiments, the polymer contains polyvinylidene fluoride, and electrodes are patterned to control local electric fields. Another haptic stimulator has first and second electrodes with an air gap and an insulating sheet between first and second electrodes, with an AC voltage driver connecting to the electrodes. In a method of providing haptic stimulation to skin an alternating current supply drives first and second electrodes, the electrodes disposed upon either a piezoelectric or electroactive polymer sheet, vibrating the polymer layer by driving the electrodes; and coupling vibrations of the polymer layer to the sensate skin.

公开(公告)号：US11808763B2

公开(公告)日：2023-11-07

申请号：US16492128

申请日：2018-03-07

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE

Inventor： Amogha Tadimety ,  John X. J. Zhang

IPC: G01N33/543 ,  G01N21/552 ,  G01N33/553 ,  B82Y15/00 ,  B82Y30/00

CPC classification number: G01N33/54373 ,  G01N21/554 ,  G01N33/54346 ,  G01N33/553 ,  B82Y15/00 ,  B82Y30/00

Abstract: A method of making a plasmon-resonance biosensor includes conjugating precious metal nanorods with form factor at least 1.5 with a biological probe material. Microfluidic chambers of volume under 0.025 microliter are formed over a substrate, and an aqueous suspension of the conjugated nanorods is injected into the chambers. The nanorods are organized in rows and aligned in long dimension along the rows. The biosensor is configured to be read by obtaining an optical absorption spectrum upon exposure to the analyte. The biosensor includes precious metal nanorods organized in rows with long dimension approximately parallel to the rows. The nanorods are conjugated with biological probes capable of binding to an analyte, the probes may be an aptamer, an antibody, a protein-nucleic acid (PNA), a complimentary DNA, or an enzyme having a binding site.

公开(公告)号：US10833245B2

公开(公告)日：2020-11-10

申请号：US15880907

申请日：2018-01-26

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE ,  FACEBOOK, INC.

Inventor： Zi Chen ,  John X. J. Zhang ,  Frances Lau ,  Ali Israr

IPC: H01L41/047 ,  H01L41/08 ,  A61B5/00 ,  H01L41/09 ,  H01L41/083 ,  H01L41/193 ,  G08B6/00 ,  G06F3/01

Abstract: A haptic stimulator includes a multilayer sheet with a piezoelectric or electroactive polymer layer adapted to mechanically deform upon application of voltage, the multilayer sheet secured to a substrate, and a source of electrical stimulation coupled to drive electrodes on the polymer layer with an AC signal to vibrate the polymer layer. In particular embodiments, the polymer contains polyvinylidene fluoride, and electrodes are patterned to control local electric fields. Another haptic stimulator has first and second electrodes with an air gap and an insulating sheet between first and second electrodes, with an AC voltage driver connecting to the electrodes. In a method of providing haptic stimulation to skin an alternating current supply drives first and second electrodes, the electrodes disposed upon either a piezoelectric or electroactive polymer sheet, vibrating the polymer layer by driving the electrodes; and coupling vibrations of the polymer layer to the sensate skin.

公开(公告)号：US10147870B2

公开(公告)日：2018-12-04

申请号：US15526713

申请日：2015-11-12

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE

Inventor： John X. J. Zhang ,  Dajing Chen

IPC: H01L41/04 ,  H01L41/047 ,  H01L41/193 ,  H01L41/45 ,  H01L41/09 ,  H01L41/113 ,  H01L41/08

Abstract: A method for producing a porous piezoelectric polymer film with a dense surface, includes depositing a polymer solution onto a substrate to form a polymer film including a solvent; evaporating a portion of the solvent to form the dense surface away from the substrate; forming water droplets in interior of the polymer film; and substantially evaporating the water droplets and remaining solvent to form porous interior. A piezoelectric composition includes a piezoelectric material with a porous interior and a dense surface for interfacing with an electrode. A piezoelectric device includes a first electrode; a porous piezoelectric film with a dense surface and porous interior, wherein the porous piezoelectric film is deposited on the first electrode and the dense surface is away from the first electrode; and a second electrode deposited on the dense surface for, together with the first electrode, providing an electrical interface for the porous piezoelectric film.