Abstract
Carbon nanotubes (CNTs), having either metallic or semiconducting properties depending on their chirality, are advanced materials that can be used for different devices and materials (e.g., fuel cells, transistors, solar cells, reinforced materials, and medical materials) due to their excellent electrical conductivity, mechanical strength, and thermal conductivity. Single-walled CNTs (SWNTs) have received special attention due to their outstanding electrical and optical properties; however, the inability to selectively synthesize specific types of CNTs has been a major obstacle for their commercialization. Therefore, researchers have studied different methods for the separation of SWNTs based on their electrical and optical properties. Gel chromatography methods enable the large-scale separation of metallic/semiconducting (m/s) SWNTs and single-chirality SWNTs with specific bandgaps. The core principle of gel chromatography-based SWNT separation is the interaction between the SWNTs and gels, which depends on the unique electrical properties of the former. Controlled pore glass, silica gel, agarose-based gel, and allyl dextran-based gel have been exploited as mediums for gel chromatography. In this paper, the interaction between SWNTs and gels and the different gel chromatography-based SWNT separation technologies are introduced. This paper can serve as a reference for researchers who plan to separate SWNTs with gel chromatography.
Highlights
Academic Editors: Jun Araki, Carbon nanotubes (CNTs) are tube-like, rolled-up graphene sheets that exhibit unique electrical and optical properties because of their one-dimensional structure [1]
This paper presents the single-walled CNTs (SWNTs)-surfactant aqueous solutions were used as feed samples in hydrogel-based sepaseparation and successful examples separation different gel rations, andmechanism the SWNT separation mechanism hasofbeen analyzed basedwith on the interaction types
Instead of using an 6anionic surfactant, agarose gel was gelfor interaction is an ionic force, Superose is estimated to have an appropriate polarity as anionized withwell naphthalene sulfonate groups; m/s-SWNTs can be separated by as pore size to enable the selective interaction with the specific chiralitypolarity
Summary
Academic Editors: Jun Araki, Carbon nanotubes (CNTs) are tube-like, rolled-up graphene sheets that exhibit unique electrical and optical properties because of their one-dimensional structure [1]. Gel chromatography [49,50,51] and aqueous two-phase extraction (ATPE) have been proposed as large-scale separation methods for commercialization [52,53,54]. Since gel chromatography can be used for both the simultaneous high-purity separation of m/s-SWNTs and chirality-specific separation of SWNTs utilizing a relatively simple process over the ATPE. SWNTs were eluted at the first, which had not been adsorbed the gel.inSecond, a low concentration of as surfactant aqueous is injected into polymers the gel to from elute SWNTs the residual conditions such temperature, and solution it is difficult to remove [57]. This paper presents the SWNT-surfactant aqueous solutions were used as feed samples in hydrogel-based sepaseparation and successful examples separation different gel rations, andmechanism the SWNT separation mechanism hasofbeen analyzed basedwith on the interaction types. Chromatography [61,64]
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