3D printing of piezoelectric ceramic particle/fluoropolymer nanocomposites with in-situ poling for sensor applications

Patent metadata

Field	Value
Publication number	US-11014268-B2
Application number	US-201816038873-A
Country	US
Kind code	B2
Filing date	Jul 18, 2018
Priority date	Jul 24, 2017
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

Embodiments of the invention are directed to methods, devices, and compositions for 3D printing of piezoelectric devices. The piezoelectric devices can be used for sensor applications using poly(vinylidene) fluoride (PVDF) and BaTiO3 (BTO) nanocomposites through in-situ electric poling 3D printing process.

First claim

The invention claimed is:

1. A method of making a piezoelectric ceramic particle (PCP)/multi-walled carbon nanotube (MWCNT)/fluoropolymer filament comprising:
(a) mixing a PCP, MWCNT and fluoropolymer powder for forming a PCP/MWCNT/fluoropolymer composite comprising 0.01 wt. % to 0.4 wt. % of MWCNT and a uniform distribution of PCPs in the PCP/MWCNT/fluoropolymer composite; and
(b) forming the PCP/MWCNT/fluoropolymer composite into a printing filament.

2. The method of claim 1 , further comprising:
(a) dissolving the fluoropolymer powder in an organic solvent at a weight ratio of 1:5 to 1:15 and adding the PCP powder and MWCNT to the fluoropolymer solution;
(b) evaporating the organic solvent to form a PCP/MWCNT/fluoropolymer nanocomposite; and
(c) extruding the PCP/MWCNT/fluoropolymer nanocomposite to form a filament.

3. The method of claim 1 , wherein the fluoropolymer is PVDF.

4. The method of claim 1 , wherein the PCP is barium titanate (BTO).

5. The method of claim 3 , further comprising mixing a carbon nanomaterial prior to solvent casting.

6. The method of claim 2 , wherein the organic solvent is DMF, DMSO.

7. The method of claim 2 , wherein the weight ratio fluoropolymer to organic solvent is about 1:10.

8. The method of claim 4 , wherein the BTO/MWCNT/fluoropolymer nanocomposite is extruded at a temperature of 100 to 350° C.

9. The method of claim 1 , wherein the filament has a diameter of 0.5 to 4 mm.

Assignees

• Tseng Tzu Liang
• Lin Yirong
• Kim Hoejin
• Univ Texas

Inventors

• Tseng Tzu-Liang
• Lin Yirong
• Kim Hoejin

Classifications

• D01F1/10 Primary

  Other agents for modifying properties · CPC title

• B33Y70/10

  Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials · CPC title

• D01F1/09

  for making electroconductive or anti-static filaments · CPC title

• D01F6/12

  from polymers of fluorinated hydrocarbons · CPC title

• B29C48/2888

  in thread form or in strip form, e.g. rubber strips · CPC title