公开(公告)号：US12144260B2

公开(公告)日：2024-11-12

申请号：US17154711

申请日：2021-01-21

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Fan Yang ,  Jun Li

IPC: H10N30/00 ,  C08J5/18 ,  C08J7/06 ,  C09D1/00 ,  H10N30/02 ,  H10N30/87

Abstract: A flexible piezoelectric thin film, and method of manufacture, has a polyvinyl alcohol (PVA)-glycine-PVA sandwich heterostructure. The thin film is manufactured by evaporating the solvent from a glycine-PVA mixture solution. The film automatically assembles into the PVA-glycine-PVA sandwich heterostructure as it is salted out. Strong hydrogen bonding between the oxygen atoms in glycine and hydroxyl groups on PVA chains are responsible for the nucleation and growth of the piezoelectric γ-glycine and alignment of the domain orientation.

公开(公告)号：US20240341196A1

公开(公告)日：2024-10-10

申请号：US18130521

申请日：2023-04-04

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Jun Li

IPC: H10N30/85 ,  C08J7/04 ,  D01F4/00 ,  H02N2/18 ,  H10N30/092

CPC classification number: H10N30/852 ,  C08J7/0427 ,  D01F4/00 ,  H02N2/186 ,  H10N30/092 ,  C08J2383/04 ,  C08J2477/04 ,  D10B2401/16

Abstract: A stretchable piezoelectric thin film, and method of manufacture, an open mesh structure formed by a repeating branching and joining pattern. The thin film is manufactured by slowly lifting amino acid nanofibrils from a water-alcohol biphasic solvent. The film automatically assembles into a truss-like mesh network of amino acid nanofibrils that allows the open meshes to close with narrowed intersection angles between the amino acid nanofibrils. The alcohol molecules of the water-alcohol biphasic solvent preferably bind to the carboxyl groups on the amino acid surfaces thus limiting the growth along the side facets of the amino acid surfaces and promoting growth along the growth front producing a bifurcation in the amino acid biocrystal network.

公开(公告)号：US11988992B2

公开(公告)日：2024-05-21

申请号：US16600046

申请日：2019-10-11

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Jun Li

IPC: G04B1/02 ,  G04C1/08 ,  G04C10/00

CPC classification number: G04B1/02 ,  G04C1/082 ,  G04C10/00

Abstract: An energy harvesting system for use with the human body may use an eccentrically mounted weight winding a mainspring that drives a mechanical clock mechanism. The mechanical clock mechanism in turn may produce pulses of electricity, for example, through periodic flexing of a piezoelectric or triboelectric material during the regular motion of the mechanical timing mechanism. By remaining in a mechanical rather than electrical domain, improved simplicity and efficiency may be obtained in the generation of regularly spaced uniform pulses.

公开(公告)号：US11849642B2

公开(公告)日：2023-12-19

申请号：US16851400

申请日：2020-04-17

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Jun Li

IPC: G01L9/08 ,  B33Y80/00 ,  H10N30/084 ,  H10N30/057 ,  H10N30/092

CPC classification number: H10N30/057 ,  B33Y80/00 ,  G01L9/08 ,  H10N30/084 ,  H10N30/092

Abstract: A piezoelectric artificial artery can be 3D printed to provide the real-time precise sensing of blood pressure and vessel motion patterns enabling early detection of partial occlusions. An electric-field assisted 3D printing method allows for rapid printing and simultaneously poled complex ferroelectric structures with high fidelity and good piezoelectric performance. The print material consists of ferroelectric potassium sodium niobate (KNN) particles embedded within a ferroelectric polyvinylidene fluoride (PVDF) polymer matrix.

公开(公告)号：US20220254985A1

公开(公告)日：2022-08-11

申请号：US17170382

申请日：2021-02-08

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Jun Li

IPC: H01L41/18 ,  H01L41/083 ,  H01L41/257 ,  H01L41/277 ,  C08K3/11 ,  C08K3/04

Abstract: An in-situ poled ferroelectric prints with true 3D geometry is provided with an intercalated electrode design where soft polymer matrixes are selected for the ferroelectric layers, and rigid polymer matrixes are selected for the electrode layers, thus mimicking nacre architecture with a ceramic-like piezoelectric property and bone-like fracture toughness. Lithium-doped potassium sodium niobite (Li-KNN) microparticles may be used to produce ferroelectric properties and to create strong interfacial bonding with the interfacing electrode layers. Polylactic acid (PLA) in the electrode layers may be used to facilitate strong interfacial bonding with the Li-KNN microparticles.

公开(公告)号：US12010920B2

公开(公告)日：2024-06-11

申请号：US17170382

申请日：2021-02-08

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Jun Li

IPC: H01L41/08 ,  C08K3/04 ,  C08K3/11 ,  H01L41/18 ,  H10N30/045 ,  H10N30/057 ,  H10N30/50 ,  H10N30/85

CPC classification number: H10N30/852 ,  C08K3/04 ,  C08K3/11 ,  H10N30/045 ,  H10N30/057 ,  H10N30/50

Abstract: An in-situ poled ferroelectric prints with true 3D geometry is provided with an intercalated electrode design where soft polymer matrixes are selected for the ferroelectric layers, and rigid polymer matrixes are selected for the electrode layers, thus mimicking nacre architecture with a ceramic-like piezoelectric property and bone-like fracture toughness. Lithium-doped potassium sodium niobite (Li—KNN) microparticles may be used to produce ferroelectric properties and to create strong interfacial bonding with the interfacing electrode layers. Polylactic acid (PLA) in the electrode layers may be used to facilitate strong interfacial bonding with the Li—KNN microparticles.

公开(公告)号：US20210109480A1

公开(公告)日：2021-04-15

申请号：US16600046

申请日：2019-10-11

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Jun Li

IPC: G04B1/02 ,  G04C10/00 ,  G04C1/08

Abstract: An energy harvesting system for use with the human body may use an eccentrically mounted weight winding a mainspring that drives a mechanical clock mechanism. The mechanical clock mechanism in turn may produce pulses of electricity, for example, through periodic flexing of a piezoelectric or triboelectric material during the regular motion of the mechanical timing mechanism. By remaining in a mechanical rather than electrical domain, improved simplicity and efficiency may be obtained in the generation of regularly spaced uniform pulses.

公开(公告)号：US20220231218A1

公开(公告)日：2022-07-21

申请号：US17154711

申请日：2021-01-21

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Fan Yang ,  Jun Li

IPC: H01L41/08 ,  C08J5/18 ,  C09D1/00 ,  C08J7/06 ,  H01L41/047 ,  H01L41/23

Abstract: A flexible piezoelectric thin film, and method of manufacture, has a polyvinyl alcohol (PVA)-glycine-PVA sandwich heterostructure. The thin film is manufactured by evaporating the solvent from a glycine-PVA mixture solution. The film automatically assembles into the PVA-glycine-PVA sandwich heterostructure as it is salted out. Strong hydrogen bonding between the oxygen atoms in glycine and hydroxyl groups on PVA chains are responsible for the nucleation and growth of the piezoelectric γ-glycine and alignment of the domain orientation.

公开(公告)号：US20210328130A1

公开(公告)日：2021-10-21

申请号：US16851400

申请日：2020-04-17

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xudong Wang ,  Jun Li

IPC: H01L41/277 ,  G01L9/08 ,  H01L41/37 ,  H01L41/333 ,  B33Y80/00

Abstract: A piezoelectric artificial artery can be 3D printed to provide the real-time precise sensing of blood pressure and vessel motion patterns enabling early detection of partial occlusions. An electric-field assisted 3D printing method allows for rapid printing and simultaneously poled complex ferroelectric structures with high fidelity and good piezoelectric performance. The print material consists of ferroelectric potassium sodium niobite (KNN) particles embedded within a ferroelectric polyvinylidene fluoride (PVDF) polymer matrix.