Aqueous solution for structural separation of carbon nanotubes, method for separating and recovering carbon nanotubes using said aqueous solution, and carbon nanotubes obtained by said method
US-2021269312-A1 · Sep 2, 2021 · US
Method for separating carbon nanotubes using modified cellulose
US12534370B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12534370-B2 |
| Application number | US-202117905248-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 11, 2021 |
| Priority date | Mar 12, 2020 |
| Publication date | Jan 27, 2026 |
| Grant date | Jan 27, 2026 |
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Abstract
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The present invention relates to using modified cellulose (e.g., nitrated cellulose) for separating carbon nanotubes (CNTs). A raw mixture of CNTs of different structures or chiral angles (chiralities), can be separated into fractions, based on their selective permeation through a separation column filled with nitrated cellulose. The present invention is particularly useful in separating semiconducting CNTs and metallic CNTs.
First claim
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What is claimed is: 1 . A method for separating metallic CNTs (M-CNTs) from semiconducting CNTs (S-CNTs) in a mixture of carbon nanotubes (CNTs), comprising the steps of: dispersing the mixture of CNTs in a solution to form a CNT dispersion, passing the CNT dispersion through a column packed with nitrated cellulose, eluting S-CNTs with a first aqueous solution comprising a first surfactant, and eluting M-CNTs with a second aqueous solution comprising a second surfactant, wherein the first aqueous solution and the second aqueous solution are different. 2 . The method according to claim 1 , wherein the first surfactant and the second surfactant are different. 3 . The method according to claim 1 , wherein the cellulose is cotton. 4 . The method according to claim 1 , wherein the nitrogen content in the nitrated cellulose is from 2 to 12 wt %. 5 . The method according to claim 1 , wherein the nitrogen content in the nitrated cellulose is from 5 to 9 wt %. 6 . The method according to claim 1 , wherein the M-CNTs and S-CNTs are single-walled CNTs. 7 . The method according to claim 1 , wherein the dispersing solution comprises one or more dispersing surfactants. 8 . The method according to claim 7 , wherein the one or more dispersing surfactants are anionic surfactants. 9 . The method according to claim 8 , wherein the anionic surfactants are selected from the group consisting of: cholate, deoxycholates, sulfates, sulfonates, phosphates, phosphonates, carboxylates, and any combinations thereof. 10 . The method according to claim 9 , wherein the anionic surfactants are selected from the group consisting of: sodium dodecyl sulfate, sodium cholate, sodium deoxycholate, sodium dodecyl benzene cholate, and any combinations thereof. 11 . The method according to claim 1 , wherein the first and the second surfactants are different and are selected from the group consisting of: deoxycholates, sulfates, cholates, sulfonates, phosphates, phosphonates, carboxylates, and any combinations thereof. 12 . The method according to claim 11 , wherein the first and the second surfactants are different and are selected from the group consisting of: sodium dodecyl sulfate, sodium cholate, sodium deoxycholate, sodium dodecyl benzene cholate, and any combinations thereof. 13 . A method for separating metallic CNTs (M-CNTs) from semiconducting CNTs (S-CNTs) in a mixture of carbon nanotubes (CNTs), comprising the steps of: dispersing the mixture of CNTs in a solution to form a CNT dispersion, passing the CNT dispersion through a column packed with nitrated cellulose, eluting M-CNTs with a first aqueous solution comprising a first surfactant, and eluting S-CNTs with a second aqueous solution comprising a second surfactant, wherein the first aqueous solution and the second aqueous solution are different. 14 . The method according to claim 13 , wherein the first surfactant and the second surfactant are different. 15 . The method according to claim 14 , wherein the first surfactant and the second surfactant are selected from the group consisting of: deoxycholates, sulfates, cholates, sulfonates, phosphates, phosphonates, carboxylates, and any combinations thereof. 16 . The method according to claim 13 , wherein the cellulose is cotton. 17 . The method according to claim 13 , wherein the nitrogen content in the nitrated cellulose is from 2 to 12 wt %. 18 . The method according to claim 13 , wherein the M-CNTs and S-CNTs are single-walled CNTs. 19 . The method according to claim 13 , wherein the dispersing solution comprises one or more anionic surfactants. 20 . The method according to claim 19 , wherein the anionic surfactants are selected from the group consisting of: cholate, deoxycholates, sulfates, sulfonates, phosphates, phosphonates, carboxylates, and any combinations thereof.
Assignees
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Classifications
by UV- or VIS- data · CPC title
by IR- or Raman-data · CPC title
Electronic properties · CPC title
Single-walled nanotubes · CPC title
Sorbents specially adapted for preparative chromatography · CPC title
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Frequently asked questions
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- What does patent US12534370B2 cover?
- The present invention relates to using modified cellulose (e.g., nitrated cellulose) for separating carbon nanotubes (CNTs). A raw mixture of CNTs of different structures or chiral angles (chiralities), can be separated into fractions, based on their selective permeation through a separation column filled with nitrated cellulose. The present invention is particularly useful in separating semico…
- Who is the assignee on this patent?
- Yazaki Corp
- What technology area does this patent fall under?
- Primary CPC classification C01B32/172. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 27 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).