公开(公告)号：US11787691B2

公开(公告)日：2023-10-17

申请号：US16292968

申请日：2019-03-05

Applicant: Massachusetts Institute of Technology

Inventor： Anastasios John Hart ,  Brian L. Wardle ,  Enrique J. Garcia ,  Alexander H. Slocum

IPC: B82B1/00 ,  B82Y30/00 ,  B82Y40/00 ,  D01F9/127 ,  D01F9/133 ,  D06M11/74 ,  D06M23/08 ,  C01B32/158 ,  C01B32/16 ,  C01B32/162 ,  C01B32/164 ,  C01B32/18 ,  B01J21/04 ,  B01J23/745

CPC classification number: B82B1/00 ,  B01J21/04 ,  B01J23/745 ,  B82Y30/00 ,  B82Y40/00 ,  C01B32/158 ,  C01B32/16 ,  C01B32/162 ,  C01B32/164 ,  C01B32/18 ,  D01F9/127 ,  D01F9/133 ,  D06M11/74 ,  D06M23/08 ,  C01B2202/08 ,  Y02P20/582 ,  Y02P20/584 ,  Y10S977/742 ,  Y10S977/843

Abstract: The present invention provides methods for uniform growth of nanostructures such as nanotubes (e.g., carbon nanotubes) on the surface of a substrate, wherein the long axes of the nanostructures may be substantially aligned. The nanostructures may be further processed for use in various applications, such as composite materials. For example, a set of aligned nanostructures may be formed and transferred, either in bulk or to another surface, to another material to enhance the properties of the material. In some cases, the nanostructures may enhance the mechanical properties of a material, for example, providing mechanical reinforcement at an interface between two materials or plies. In some cases, the nanostructures may enhance thermal and/or electronic properties of a material. The present invention also provides systems and methods for growth of nanostructures, including batch processes and continuous processes.

公开(公告)号：US11698330B2

公开(公告)日：2023-07-11

申请号：US17072025

申请日：2020-10-15

Applicant: Massachusetts Institute of Technology

Inventor： Crystal Elaine Owens ,  Gareth H. McKinley ,  Anastasios John Hart

IPC: G01N11/14 ,  G01N11/00 ,  B01L3/00

CPC classification number: G01N11/14 ,  B01L3/5085 ,  G01N2011/0033

Abstract: The present disclosure is directed to rheometric fixtures for making rheological measurements of yield stress fluids. In some embodiments, the fixture can be an improvement of a typical vane by having the ability to create a more homogeneous shear profile in a test material, e.g., a yield stress fluid. These vane fixtures having fractal-like cross-sectional structures enable robust rheological measurements of the properties of yield stress fluids due to several outer contact edges that lead to increased kinematic homogeneity at the point of yielding and beyond. The branching structure of the fractal-like fixtures can alter the shape of a wetted perimeter of the fixture while minimizing an area thereof to allow the fixture to be inserted into fluids with less disturbance. In some embodiments, a cup with a ribbed inner surface can be used to hold the sample fluid and disassembles for ease of cleaning following completion of the measurement.

公开(公告)号：US11612839B2

公开(公告)日：2023-03-28

申请号：US16341326

申请日：2017-10-18

Applicant: Massachusetts Institute of Technology

Inventor： Michael S. Bono ,  Sydney B. Beasley ,  Emily Barret Hanhauser ,  Chintan Vaishnav ,  Anastasios John Hart ,  Rohit Nandkumar Karnik

IPC: G01N1/10 ,  B01D35/06 ,  B01L3/00

Abstract: Systems, devices, and methods for detecting contamination (e.g., bacteria) in fluid are provided. The systems, devices, and methods allow for filtering a fluid sample using a filter to capture and concentrate cells (e.g., bacteria) to detect electrochemical properties thereof. The cells can be exposed to a reagent that diffuses into the cells to produce a product of interest that can be used in analysis of the fluid sample. The product of interest can diffuse out of the filter into a fluid storage component for detection and analysis by an analysis component. After the sampling is completed, the filter can be detached and discarded. Other aspects of the present disclosure, including enhancements and various systems and methods for concentrating cells and analyzing the same, are also provided.

公开(公告)号：US11597144B2

公开(公告)日：2023-03-07

申请号：US16261535

申请日：2019-01-29

Applicant: Massachusetts Institute of Technology

Inventor： Anastasios John Hart ,  Justin Douglas Beroz ,  Alvin Thong Lip Tan

IPC: B29C64/165 ,  B33Y10/00 ,  B29C64/106 ,  C09D5/22 ,  C09D1/00 ,  B33Y70/00 ,  B33Y50/02 ,  B29C64/20 ,  B29C64/393 ,  B33Y30/00

Abstract: Disclosed are methods for building colloidal solids by precipitation from a liquid bridge using a needle through which a colloidal particle suspension is dispensed onto a substrate in a temperature-controlled environment. The substrate can rest on a motion-controlled stage, and freeform shapes can be built by coordinating the motion of the stage with the rate of dispense of colloidal particle suspension. Aspects include a scaling law that governs the rate of assembly and a direct-write colloidal assembly process that combines self-assembly with direct-write 3D printing, and can be used to build exemplary freestanding structures using a diverse materials, such as polystyrene, silica and gold particles. Additionally, disclosed are methods for predicting and eliminating cracking by a geometric relationship between particle size and structure dimensions, enabling the production of macroscale, crack-free colloidal crystals.

公开(公告)号：US11511373B2

公开(公告)日：2022-11-29

申请号：US16114188

申请日：2018-08-27

Applicant: Massachusetts Institute of Technology

Inventor： Ryan Wade Penny ,  Anastasios John Hart

IPC: B23K26/342 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  B23K26/70 ,  G01N21/95 ,  B23K31/12 ,  B23K26/03 ,  B23K26/06 ,  B23K26/073 ,  B23K26/082 ,  B23K26/0622 ,  B29C64/30 ,  B29C64/393 ,  G01N21/84 ,  G01N21/94

Abstract: Systems, devices, and methods for additive manufacturing are provided that allow for components being manufactured to be assessed during the printing process. As a result, changes to a print plan can be considered, made, and implemented during the printing process. More particularly, in exemplary embodiments, a spectrometer is operated while a component is being printed to measure one or more parameters associated with one or more layers of the component being printed. The measured parameter(s) are then relied upon to determine if any changes are needed to the way printing is occurring, and if such changes are desirable, the system is able to implement such changes during the printing process. By way of non-limiting examples, printed material in one or more layers may be reheated to alter the printed component, such as to remove defects identified by the spectrometer data. A variety of systems, devices, and methods for performing real-time sensing and control of an additive manufacturing process are also provided.

公开(公告)号：US20210109003A1

公开(公告)日：2021-04-15

申请号：US17072025

申请日：2020-10-15

Applicant: Massachusetts Institute of Technology

Inventor： Crystal Elaine Owens ,  Gareth H. McKinley ,  Anastasios John Hart

IPC: G01N11/14 ,  B01L3/00

Abstract: The present disclosure is directed to rheometric fixtures for making rheological measurements of yield stress fluids. In some embodiments, the fixture can be an improvement of a typical vane by having the ability to create a more homogeneous shear profile in a test material, e.g., a yield stress fluid. These vane fixtures having fractal-like cross-sectional structures enable robust rheological measurements of the properties of yield stress fluids due to several outer contact edges that lead to increased kinematic homogeneity at the point of yielding and beyond. The branching structure of the fractal-like fixtures can alter the shape of a wetted perimeter of the fixture while minimizing an area thereof to allow the fixture to be inserted into fluids with less disturbance. In some embodiments, a cup with a ribbed inner surface can be used to hold the sample fluid and disassembles for ease of cleaning following completion of the measurement.

公开(公告)号：US10906285B2

公开(公告)日：2021-02-02

申请号：US16502313

申请日：2019-07-03

Applicant: Massachusetts Institute of Technology

Inventor： Brian L. Wardle ,  Anastasios John Hart ,  Enrique J. Garcia ,  Alexander H. Slocum

IPC: B32B37/02 ,  C01B32/162 ,  C01B32/18 ,  B82B1/00 ,  B82Y30/00 ,  B82Y40/00 ,  C08J5/00 ,  D01F9/127 ,  D01F9/133

Abstract: The present invention provides methods for uniform growth of nanostructures such as nanotubes (e.g., carbon nanotubes) on the surface of a substrate, wherein the long axes of the nanostructures may be substantially aligned. The nanostructures may be further processed for use in various applications, such as composite materials. For example, a set of aligned nanostructures may be formed and transferred, either in bulk or to another surface, to another material to enhance the properties of the material. In some cases, the nanostructures may enhance the mechanical properties of a material, for example, providing mechanical reinforcement at an interface between two materials or plies. In some cases, the nanostructures may enhance thermal and/or electronic properties of a material. The present invention also provides systems and methods for growth of nanostructures, including batch processes and continuous processes.

公开(公告)号：US20200346476A1

公开(公告)日：2020-11-05

申请号：US16959721

申请日：2018-01-05

Applicant: Massachusetts Institute of Technology

Inventor： Anastasios John Hart ,  Sanha Kim

IPC: B41M1/42 ,  B41N1/12

Abstract: Methods and apparatus for contacting printing via electrostatic force. In one example, an apparatus for contact printing using an ink includes a substrate, a conductive layer disposed on the substrate, and a group of microstructures disposed on the conductive layer. Each microstructure includes a group of conductive porous medium extending from the conductive layer. The apparatus also includes a dielectric layer conformally disposed on the microstructures and configured to electrically insulate the microstructures from the ink during use. The conductive layer is configured to apply a voltage on the group of microstructures to facilitate the loading and dispensing of ink.

公开(公告)号：US10696034B2

公开(公告)日：2020-06-30

申请号：US15376416

申请日：2016-12-12

Applicant: Massachusetts Institute of Technology

Inventor： Sebastian William Pattinson ,  Anastasios John Hart

IPC: B29C64/236 ,  B33Y10/00 ,  B29C64/106 ,  B29C64/20 ,  B29C64/118 ,  B29C64/232 ,  B29C64/209 ,  B33Y30/00 ,  B33Y80/00 ,  A61F2/90 ,  A61F2/06 ,  A61F2/00 ,  B29K23/00 ,  B29K67/00 ,  B29L31/00

Abstract: Methods, systems, and devices for extrusion-based three-dimensional printing are provided. The methods, systems, and devices allow for the printing materials such as fabrics, clothing, and wearable and/or implantable devices. A number of different enhancements are provided that allow for this improved form of three-dimensional printing, including: (1) printing using a polymer (e.g., cellulose acetate) dissolved in a solvent (e.g., acetone); (2) selectively bonding portions of a deposited filament onto one or more surfaces and/or one or more previously deposited filaments; (3) using particular toolpaths to create a fabric or similar material by creating a woven pattern; and (4) printing across multiple layers even when previous layers are not complete. Other aspects of the present disclosure, including other enhancements and various printer configurations, are also provided.

公开(公告)号：US20190336948A1

公开(公告)日：2019-11-07

申请号：US16292968

申请日：2019-03-05

Applicant: Massachusetts Institute of Technology

Inventor： Anastasios John Hart ,  Brian L. Wardle ,  Enrique J. Garcia ,  Alexander H. Slocum

IPC: B01J23/745 ,  C01B32/18 ,  B82B1/00 ,  C01B32/162 ,  C01B32/16 ,  C01B32/164 ,  B82Y30/00 ,  B82Y40/00 ,  D01F9/127 ,  D01F9/133 ,  D06M11/74 ,  B01J21/04 ,  D06M23/08

Abstract: The present invention provides methods for uniform growth of nanostructures such as nanotubes (e.g., carbon nanotubes) on the surface of a substrate, wherein the long axes of the nanostructures may be substantially aligned. The nanostructures may be further processed for use in various applications, such as composite materials. For example, a set of aligned nanostructures may be formed and transferred, either in bulk or to another surface, to another material to enhance the properties of the material. In some cases, the nanostructures may enhance the mechanical properties of a material, for example, providing mechanical reinforcement at an interface between two materials or plies. In some cases, the nanostructures may enhance thermal and/or electronic properties of a material. The present invention also provides systems and methods for growth of nanostructures, including batch processes and continuous processes.