3-d printed devices formed with magnetic inks and methods of making graded index structures

Patent metadata

Field	Value
Publication number	US-11845219-B2
Application number	US-202016864522-A
Country	US
Kind code	B2
Filing date	May 1, 2020
Priority date	May 6, 2019
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

A 3-D printed device comprising one or more structures, the structures comprising a plurality of magnetically responsive particles and one or more diblock or triblock copolymers; the diblock or triblock copolymers having an A-B, A-B-A, or A-B-C block-type structure in which the A-blocks and C-blocks are an aromatic-based polymer or an acrylate-based polymer and the B-blocks are an aliphatic-based polymer. These 3-D printed devices may be formed using a method that comprises providing a magnetic ink composition; applying the magnetic ink composition to a substrate in a 3-D solvent cast printing process to form one or more structures; and drying the one or more structures formed from the magnetic ink composition. The dried structures can exhibit one or more regions of magnetic permeability greater than 1.3×10 −6 H/m.

First claim

What is claimed is:

1. A 3-D printed device, comprising a structure formed by a plurality of magnetically responsive particles and one or more diblock or triblock copolymers; the diblock or triblock copolymers having an A-B, A-B-A, or A-B-C block-type structure in which the A-blocks and C-blocks are an aromatic-based polymer or an acrylate-based polymer and the B-blocks are an aliphatic-based polymer; wherein at least a portion of the structure exhibits a magnetic permeability greater than about 1.3×10-6 H/m; wherein a concentration of the magnetically responsive particles varies in different portions of the structure; wherein at least a portion of the 3-D printed device comprises a structure in which the concentration of magnetically responsive particles varies according to a gradient; wherein the 3D printed device is a radio frequency (RF) antenna.

2. The 3-D printed device of claim 1 , wherein the 3-D printed device is a graded index device.

3. The 3-D printed device of claim 1 , wherein the 3-D printed device is a lens for coupling to an RF antenna or RF horn antenna.

4. The 3-D printed device of claim 1 , wherein the structure is formed by a magnetic ink composition, the magnetic ink composition comprising a plurality of magnetically responsive particles and one or more diblock or triblock copolymers; the diblock or triblock copolymers having an A-B, A-B-A, or A-B-C block-type structure in which the A-blocks and C-blocks are an aromatic-based polymer or an acrylate-based polymer and the B-blocks are an aliphatic-based polymer; wherein the magnetic particles comprise 0.5 wt. % to 40 wt. % of at least a portion of the structure based on the dry weight of the magnetic ink composition; wherein at least a portion of the structure exhibits a magnetic permeability greater than about 1.3×10 −6 H/m.

5. The 3-D printed device of claim 1 , wherein the 3-D printed device is a graded index device, wherein the structure exhibits different variations in the concentration of the magnetically responsive particles.

6. The 3-D printed device of claim 1 , wherein the magnetically responsive particles have a surface that is modified.

7. The 3-D printed device of claim 6 , wherein the wherein the surface is modified with one or more of: a surfactant; a hydrophobic moiety; a polyvinylpyrrolidone; an amine-containing compound; or a silane coupling agent.

8. The 3-D printed device of claim 1 , wherein the structure further comprises dielectric particles having an electrical permittivity different from an electrical permittivity of the magnetically responsive particles.

9. The 3-D printed device of claim 8 , wherein a concentration of the dielectric particles varies in different portions of the structure.

10. The 3-D printed device of claim 8 , wherein a concentration of the dielectric particles and a concentration of the magnetically responsive particles vary in different parts of the structure.

11. The 3-D printed device of claim 8 , wherein the 3-D printed device is a graded index device, wherein the structure exhibits different ratios of the concentration of dielectric particles and the concentration of magnetically responsive particles.

Assignees

• Massachusetts Inst Technology
• Harvard College

Inventors

• Fedynyshyn Theodore H
• Lewis Jennifer A
• Duncan Bradley P

Classifications

• H10W70/666

  Organic materials or pastes · CPC title

• B29C64/165 Primary

  using a combination of solid and fluid materials, e.g. a powder selectively bound by a liquid binder, catalyst, inhibitor or energy absorber · CPC title

• B05D5/083

  involving the use of fluoropolymers · CPC title

• B29C64/209

  Heads; Nozzles · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title