Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs
Multi-walled carbon nanotubes (CNTs), pristine and subjected to treatments, are comparatively characterized from N2 and Kr (77 K) adsorption measurements. The CNTs are lab-synthesized by in situ chemical vapour deposition of an iron-based organometallic compound at 895 °C. The treatments applied to...
| Autores principales: | , |
|---|---|
| Publicado: |
2011
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00086223_v49_n3_p980_Zilli http://hdl.handle.net/20.500.12110/paper_00086223_v49_n3_p980_Zilli |
| Aporte de: |
| id |
paper:paper_00086223_v49_n3_p980_Zilli |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_00086223_v49_n3_p980_Zilli2023-06-08T14:33:12Z Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs Bonelli, Pablo R. Cukierman, Ana Lea Adsorption capacities Adsorption characteristic Adsorption measurement BET specific surface area Chemical vapour deposition Gas adsorption capacity Gas phase oxidation In-situ Iron-based Kr adsorption Low temperatures Mild temperatures Multi-walled Multilayer adsorption Organometallic compounds Surface characterization Textural characterization Adsorption isotherms Chemical vapor deposition Ethanol Gas adsorption Knowledge based systems Monolayers Multiwalled carbon nanotubes (MWCN) Organometallics Oxidation Ultrasonic dispersion Ultrasonics Krypton Multi-walled carbon nanotubes (CNTs), pristine and subjected to treatments, are comparatively characterized from N2 and Kr (77 K) adsorption measurements. The CNTs are lab-synthesized by in situ chemical vapour deposition of an iron-based organometallic compound at 895 °C. The treatments applied to the CNTs include low temperature gas-phase oxidation, mild temperature annealing and ultrasonic dispersion in ethanol, in an attempt to examine possible changes in adsorption characteristics. N2 and Kr adsorption measurements give rise to steadily increasing and stepped isotherms, respectively. The former are representative of a multilayer adsorption phenomenon, while the latter indicate successive monolayer condensation. The treatments affect differently gas adsorption capacities of the CNTs. Oxidation leads to CNTs with higher BET specific surface area and increased adsorption capacity, though the effect is more pronounced for Kr adsorption. Ultrasonic dispersion of the CNT brings about a significant reduction only in N2 adsorption capacity. Modifications in the characteristic steps in Kr adsorption isotherms of the CNTs subjected to annealing can be appreciated, although no remarkable changes are observed in N2 adsorption isotherms. Present results demonstrate that determination of Kr adsorption isotherms represents a more suitable tool to obtain a more reliable textural characterization of CNTs than does N2 adsorption. © 2010 Elsevier Ltd. All rights reserved. Fil:Bonelli, P.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cukierman, A.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00086223_v49_n3_p980_Zilli http://hdl.handle.net/20.500.12110/paper_00086223_v49_n3_p980_Zilli |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Adsorption capacities Adsorption characteristic Adsorption measurement BET specific surface area Chemical vapour deposition Gas adsorption capacity Gas phase oxidation In-situ Iron-based Kr adsorption Low temperatures Mild temperatures Multi-walled Multilayer adsorption Organometallic compounds Surface characterization Textural characterization Adsorption isotherms Chemical vapor deposition Ethanol Gas adsorption Knowledge based systems Monolayers Multiwalled carbon nanotubes (MWCN) Organometallics Oxidation Ultrasonic dispersion Ultrasonics Krypton |
| spellingShingle |
Adsorption capacities Adsorption characteristic Adsorption measurement BET specific surface area Chemical vapour deposition Gas adsorption capacity Gas phase oxidation In-situ Iron-based Kr adsorption Low temperatures Mild temperatures Multi-walled Multilayer adsorption Organometallic compounds Surface characterization Textural characterization Adsorption isotherms Chemical vapor deposition Ethanol Gas adsorption Knowledge based systems Monolayers Multiwalled carbon nanotubes (MWCN) Organometallics Oxidation Ultrasonic dispersion Ultrasonics Krypton Bonelli, Pablo R. Cukierman, Ana Lea Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs |
| topic_facet |
Adsorption capacities Adsorption characteristic Adsorption measurement BET specific surface area Chemical vapour deposition Gas adsorption capacity Gas phase oxidation In-situ Iron-based Kr adsorption Low temperatures Mild temperatures Multi-walled Multilayer adsorption Organometallic compounds Surface characterization Textural characterization Adsorption isotherms Chemical vapor deposition Ethanol Gas adsorption Knowledge based systems Monolayers Multiwalled carbon nanotubes (MWCN) Organometallics Oxidation Ultrasonic dispersion Ultrasonics Krypton |
| description |
Multi-walled carbon nanotubes (CNTs), pristine and subjected to treatments, are comparatively characterized from N2 and Kr (77 K) adsorption measurements. The CNTs are lab-synthesized by in situ chemical vapour deposition of an iron-based organometallic compound at 895 °C. The treatments applied to the CNTs include low temperature gas-phase oxidation, mild temperature annealing and ultrasonic dispersion in ethanol, in an attempt to examine possible changes in adsorption characteristics. N2 and Kr adsorption measurements give rise to steadily increasing and stepped isotherms, respectively. The former are representative of a multilayer adsorption phenomenon, while the latter indicate successive monolayer condensation. The treatments affect differently gas adsorption capacities of the CNTs. Oxidation leads to CNTs with higher BET specific surface area and increased adsorption capacity, though the effect is more pronounced for Kr adsorption. Ultrasonic dispersion of the CNT brings about a significant reduction only in N2 adsorption capacity. Modifications in the characteristic steps in Kr adsorption isotherms of the CNTs subjected to annealing can be appreciated, although no remarkable changes are observed in N2 adsorption isotherms. Present results demonstrate that determination of Kr adsorption isotherms represents a more suitable tool to obtain a more reliable textural characterization of CNTs than does N2 adsorption. © 2010 Elsevier Ltd. All rights reserved. |
| author |
Bonelli, Pablo R. Cukierman, Ana Lea |
| author_facet |
Bonelli, Pablo R. Cukierman, Ana Lea |
| author_sort |
Bonelli, Pablo R. |
| title |
Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs |
| title_short |
Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs |
| title_full |
Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs |
| title_fullStr |
Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs |
| title_full_unstemmed |
Krypton adsorption as a suitable tool for surface characterization of multi-walled CNTs |
| title_sort |
krypton adsorption as a suitable tool for surface characterization of multi-walled cnts |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00086223_v49_n3_p980_Zilli http://hdl.handle.net/20.500.12110/paper_00086223_v49_n3_p980_Zilli |
| work_keys_str_mv |
AT bonellipablor kryptonadsorptionasasuitabletoolforsurfacecharacterizationofmultiwalledcnts AT cukiermananalea kryptonadsorptionasasuitabletoolforsurfacecharacterizationofmultiwalledcnts |
| _version_ |
1768545248678510592 |