Methods for purifying carbon materials
US7537682B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 16, 2005 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Feb 17, 2027 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M2101/40
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Methods of purifying samples are provided that are capable of removing carbonaceous and noncarbonaceous impurities from a sample containing a carbon material having a selected structure. Purification methods are provided for removing residual metal catalyst particles enclosed in multilayer carbonaceous impurities in samples generate by catalytic synthesis methods. Purification methods are provided wherein carbonaceous impurities in a sample are at least partially exfoliated, thereby facilitating subsequent removal of carbonaceous and noncarbonaceous impurities from the sample. Methods of purifying carbon nanotube-containing samples are provided wherein an intercalant is added to the sample and subsequently reacted with an exfoliation initiator to achieve exfoliation of carbonaceous impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.