A kinetic model for the deterministic prediction of gel-based single-chirality single-walled carbon nanotube separation.
ACS Nano
; 7(2): 1779-89, 2013 Feb 26.
Article
em En
| MEDLINE
| ID: mdl-23351006
ABSTRACT
We propose a kinetic model that describes the separation of single-chirality semiconducting carbon nanotubes based on the chirality-selective adsorption to specific hydrogels. Experimental elution profiles of the (7,3), (6,4), (6,5), (8,3), (8,6), (7,5), and (7,6) species are well described by an irreversible, first-order site association kinetic model with a single rate constant describing the adsorption of each SWNT to the immobile gel phase. Specifically, we find first-order binding rate constants for seven experimentally separated nanotubes normalized by the binding site molarity (M(θ)) k7,3 = 3.5 × 10â»5 M(θ)⻹ s⻹, k6,4 = 7.7 × 10â»8 M(θ)⻹ s⻹, k8,3 = 2.3 × 10â»9 M(θ)⻹ s⻹, k6,5 = 3.8 × 10â»9 M(θ)⻹ s⻹, k7,5 = 1.9 × 10⻹¹ M(θ)⻹ s⻹, k8,6 = 7.7 × 10⻹² M(θ)⻹ s⻹, and k7,6 = 3.8 × 10⻹² M(θ)⻹ s⻹. These results, as well as additional control experiments, unambiguously identify the separation process as a selective adsorption. Unlike certain chromatographic processes with retention time dependence, this separation procedure can be scaled to arbitrarily large volumes, as we demonstrate. This study provides a foundation for both the mechanistic understanding of gel-based SWNT separation as well as the potential industrial-scale realization of single-chirality production of carbon nanotubes.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Hidrogéis
/
Nanotubos de Carbono
/
Modelos Químicos
Tipo de estudo:
Prognostic_studies
/
Risk_factors_studies
Idioma:
En
Revista:
ACS Nano
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos