Cellulose-Nanofiber Carbon and Method for Producing the Same

Patent metadata

Field	Value
Publication number	US-2021163293-A1
Application number	US-201816636256-A
Country	US
Kind code	A1
Filing date	May 30, 2018
Priority date	Aug 4, 2017
Publication date	Jun 3, 2021
Grant date	—

Abstract

Cellulose-nanofiber carbon which can achieve a large specific surface area, and a method of producing the same are provided. The method for heat treating a cellulose nanofiber for carbonization includes: a freezing step of freezing a solution or gel containing the cellulose nanofiber to obtain a frozen product a drying step of drying the frozen product in a vacuum to obtain a dried product and a carbonizing step of heating and carbonizing the dried product in an atmosphere which does not burn the dried product to obtain the cellulose-nanofiber carbon.

First claim

1 . A method of producing cellulose-nanofiber carbon by carbonizing a cellulose nanofiber, the method comprising:
a freezing step of freezing a solution or gel containing the cellulose nanofiber to obtain a frozen product; a drying step of drying the frozen product in a vacuum to obtain a dried product; and a carbonizing step of heating and carbonizing the dried product in an atmosphere which does not burn the dried product to obtain cellulose-nanofiber carbon.

2 . The method of producing cellulose-nanofiber carbon according to claim 1 , further comprising
a milling step of milling the dried product carbonized in the carbonizing step.

3 . The method of producing cellulose-nanofiber carbon according to claim 2 , further comprising
a mixing step of mixing a material milled in the milling step and the cellulose-nanofiber solution to obtain a liquid mixture.

4 . The method of producing cellulose-nanofiber carbon according to claim 3 , further comprising
a drying step of removing liquid from the liquid mixture.

5 . The method of producing cellulose-nanofiber carbon according to claim 1 , further comprising
a gel generating step of generating the gel by dispersing the cellulose nanofiber using bacteria.

6 . The method of producing cellulose-nanofiber carbon according to claim 5 , further comprising
a first milling step of milling the dried product carbonized in the carbonizing step.

7 . The method of producing cellulose-nanofiber carbon according to claim 6 , further comprising
a second milling step of milling bacterially produced cellulose produced in the gel generating step, and a mixing step of mixing materials milled in the first milling step and the second milling step.

8 . The method of producing cellulose-nanofiber carbon according to claim 7 , further comprising
an applying step of applying a mixture mixed in the mixing step to form a preferred shape, and a drying step of removing liquid from the mixture.

9 . Cellulose-nanofiber carbon comprising a three-dimensional network structure which is a co-continuum formed by connecting cellulose nanofibers.

10 . Cellulose-nanofiber carbon comprising a three-dimensional network structure which is a co-continuum formed by connecting nanofibers of bacterially produced cellulose.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Nohara Masaya
• Sakamoto Shuhei
• Iwata Mikayo
• Hayashi Masahiko
• Komatsu Takeshi

Classifications

• D01F9/16

  from products of vegetable origin or derivatives thereof, e.g. from cellulose acetate (D01F9/18 takes precedence) · CPC title

• C01B32/336

  characterised by gaseous activating agents · CPC title

• C01B32/00 Primary

  Carbon; Compounds thereof (C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48) · CPC title

• C01B32/15 Primary

  Nano-sized carbon materials · CPC title

• C01P2006/12

  Surface area · CPC title