Título del libro: Micromanufacturing And Nanotechnology
Título del capítulo: Derivatisation of carbon nanotubes with amines: A solvent-free technique
VLADIMIR BASSIOUK EVDOKIMENKO; ELENA GOLOVATAYA DZHYMBEEVA;
Autores externos:
Idioma:
Inglés
Año de publicación:
2006
Resumen:
A very low solubility of carbon nanotubes (CNTs) hampers many of their potential applications. Especially this is true for multi-walled carbon nanotubes (MWNTs). One of the most efficient ways to increase CNT solubility and dispersibility is their covalent derivatisation (Bahr and Tour, 2002; Basiuk and Basiuk, 2004; Hirsch, 2002; Sun et al. 2002). All known types of chemical reactions employed for this purpose up to now can be divided into two main groups: (a) defect-group derivatisation; and (b) covalent sidewall derivatisation. The first group of reactions involve oxygenated functionalities (mainly carboxylic groups) formed on CNT tips, as well as on their sidewalls to some degree, as a result of oxidative treatment with strong mineral acids (Bahr and Tour 2002; Basiuk and Basiuk 2004; Chen et al. 1998; Hirsch 2002; Jia et al. 1999; Liu et al. 1998; Sun et al. 2002). Among these, the most extensively explored is the formation of amide derivatives between carboxylic groups on oxidised CNT tips and long-chain amines (Ausman et al. 2000; Hamon et al. 1999; Wong et al. 1998a,b). Traditionally, the reaction is performed through chemical activation of the carboxylic groups with thionyl chloride or carbodiimides in an organic solvent medium. For example, in the case of thionyl chloride and commonly used octadecylamine, the reaction can be schematically represented as follows: (Chemical equation presented) While this reaction by itself is efficient and fast, such inevitable auxiliary operations as CNT filtering and centrifuging are not. And in addition, the use of organic solvents produces harmful wastes and cannot be particularly welcomed. From common considerations, for the functionalisation of CNTs one can use the same chemical approaches that have been developed for other poorly soluble inorganic materials, for example silica materials. A decade ago we performed systematic studies on the use of the gas-phase chemical derivatisation for the synthesis of chemically modified silicas, mainly for liquid-chromatographic applications (Basiuk and Chuiko 1990, 1993; Basiuk and Khil'chevskaya 1991; Basyuk 1991; Basyuk and Chuiko 1990). Among the derivatising reagents tested were polyazamacrocyclic ligands (Basyuk 1991; Basyuk and Chuiko 1990), pyrimidine bases (Basiuk and Chuiko 1993; Basyuk 1991),
Entidades citadas de la UNAM:
ISBN:
3540253777
Editorial:
Springer Berlin Heidelberg Nombre de la publicación:
Derivatisation of carbon nanotubes with amines: A solvent-free technique
Página inicial:
441
Página final:
452
