# US 2018/0025842 A1 · Method of manufacturing metal nano coil

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- Number: US 2018/0025842 A1
- Document ID: US20180025842A1
- Status: Published application
- Kind: A1
- Application number: 15/548,761
- Filed: 2016-02-09
- Published: 2018-01-25
- Earliest claimed: 2015-02-09
- Assignees: Mitsubishi Heavy Industries, Ltd.; Akita University; Tsuchiya Co., Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.; Akita University; TSUCHIYA Co., Ltd.
- Inventors: Mikio MURAOKA; Nobuyuki KAMIHARA; Naomoto ISHIKAWA; Toshiyuki TAKAYANAGI; Hideki HORIZONO; Hiroaki HAYASHI; Osamu YOSHIDA; Kotaro TSUJI
- Web page: https://patentgrep.com/patent/US20180025842A1

## CPC

- B22F 1/18: Non-metallic particles coated with metal
- B22F 1/0547: {Nanofibres or nanotubes}
- B22F 1/0549: {Hollow particles, including tubes and shells}
- B82Y 40/00: Manufacture or treatment of nanostructures
- C23C 14/205: {by cathodic sputtering}
- C23C 14/34: Sputtering
- C23C 14/5806: {Thermal treatment}
- D01D 1/02: Preparation of spinning solutions
- D01D 5/003: {the material being a polymer solution or dispersion (D01D5/0053 takes precedence)}
- D01D 5/0076: {characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid (D01D5/0046 takes precedence)}
- D01F 6/14: from polymers of unsaturated alcohols, e.g. polyvinyl alcohol, or of their acetals or ketals
- H01F 27/28: Coils; Windings; Conductive connections
- H01F 41/042: {by thin film techniques}
- B82B 3/0095: {Manufacture or treatments or nanostructures not provided for in groups B82B3/0009 - B82B3/009}
- B82Y 25/00: Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
- D01D 5/0038: {the fibre formed by solvent evaporation, i.e. dry electro-spinning}
- D10B 2321/08: polymers of unsaturated carboxylic acids or unsaturated organic esters, e.g. polyacrylic esters, polyvinyl acetate
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- B82B: NANOSTRUCTURES FORMED BY MANIPULATION OF INDIVIDUAL ATOMS, MOLECULES, OR LIMITED COLLECTIONS OF ATOMS OR MOLECULES AS DISCRETE UNITS; MANUFACTURE OR TREATMENT THEREOF
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES

## Abstract

Provided is a method of manufacturing a metal nano coil which is suitable for mass production and results in a lower manufacturing cost. The method of manufacturing a metal nano coil includes the steps of: forming, with tension applied to a core member composed of nanofiber of a polymer, a metal thin film on a surface of the core member to fabricate a metal-covered nanofiber; reducing the tension of the metal-covered nanofiber; and heating, with the tension reduced, the metal-covered nanofiber to at or above a boiling point or a thermal decomposition temperature of the polymer and at or below the melting point of the metal thin film to vaporize the core member and shrink the metal thin film into a coil form, so that a hollow metal nano coil is produced.

## Claims

### Claim 1

A method of manufacturing a metal nano coil, comprising the steps of:
forming, with tension applied to a core member composed of nanofiber of a polymer, a metal thin film on a surface of the core member to fabricate a metal-covered nanofiber;
reducing the tension of the metal-covered nanofiber; and
heating, with the tension reduced, the metal-covered nanofiber to at or above a boiling point or a thermal decomposition temperature of the polymer and at or below the melting point of the metal thin film to vaporize the core member and shrink the metal thin film into a coil form, so that the metal nano coil is produced.

### Claim 2 (depends on 1)

The method of manufacturing a metal nano coil according to claim 1, further comprising the steps of:
placing two metal movable plates separately; and
forming the core member between the movable plates by using an electrospinning method.

### Claim 3 (depends on 2)

The method of manufacturing a metal nano coil according to claim 2, wherein
the tension of the metal-covered nanofiber is reduced by reducing the distance between the movable plates, and
the metal-covered nanofiber is heated with the metal-covered nanofiber fixed to the movable plates.