The Effects of a Readily Adsorbed Trace Component (Water) in a Bulk Separation PSA Process:  The Case of Oxygen VSA

Simon J. Wilson; Chris C. K. Beh; Paul A. Webley; Richard S. Todd

doi:10.1021/ie000801a

The Effects of a Readily Adsorbed Trace Component (Water) in a Bulk Separation PSA Process: The Case of Oxygen VSA

Industrial & Engineering Chemistry Research ◽

10.1021/ie000801a ◽

2001 ◽

Vol 40 (12) ◽

pp. 2702-2713 ◽

Cited By ~ 14

Author(s):

Simon J. Wilson ◽

Chris C. K. Beh ◽

Paul A. Webley ◽

Richard S. Todd

Keyword(s):

Trace Component ◽

Bulk Separation

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NMR Investigation of n-Alkylamine Self-Organization Along the Sidewalls of Single-Wall Carbon Nanotubes (SWNTs)

MRS Proceedings ◽

10.1557/proc-858-hh3.18 ◽

2004 ◽

Vol 858 ◽

Author(s):

Sang-Yong Ju ◽

Marcel Utz ◽

Fotios Papadimitrakopoulos

Keyword(s):

Carbon Nanotubes ◽

Density Of States ◽

Single Wall Carbon Nanotubes ◽

Aliphatic Chain ◽

Community Based ◽

Electronic Density ◽

Single Wall Carbon ◽

Bulk Separation ◽

The One ◽

Differential Solubility

Single wall carbon nanotubes (SWNTs) have drawn considerable attention from the scientific community based on their potentially unique 1-D electronic and optical properties as well as mechanical properties. These characteristics result from the one dimensional quantum wire structure of CNTs, which have the spike-like van Hove singularities (vHs) in the electronic density of states. The detailed shape of the density of states function depends sensitively on CNT type semiconducting (sem-) versus metallic (met-)), diameter and chirality. Using the preferential affinity of amines towards sem -SWNTs, our group has been able to attain bulk separation by type based on a differential solubility of SWNTs according to the amine organization interaction on the nanotube surface. It has been argued that stable dispersions of sem -SWNTs with surfactant-amines originate from the organization of the aliphatic chain along the nanotube sidewalls, along with a small amount of zwitterions. The separation of sem-enriched SWNTs assisted by octadecylamine (ODA) had been depicted in the form of either small amount of zwitterionic interaction between carboxylic acid groups of acid-purified SWNTs or the physisorption on the SWNTs sidewall, leaving met -SWNTs in the precipitate.

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