Adsorption of water vapor on mesoporosity-controlled singe wall carbon nanohorn
Source abstract
Abstract
The adsorption mechanism of water vapor in hydrophobic carbon mesopores is not clearly understood. Single wall carbon nanohorns (SWCNH) having different tube diameters in the range of 2 to 6 nm were oxidized at a lower temperature than the widely used temperature of 823 K. Oxidation at 633 K can selectively open thinner tubes of SWCNH and then the oxidation at different times can control the mesoporosity. The porosity of thus-oxidized SWCNH was evaluated from the nitrogen adsorption isotherms at 77 K. The pore volume ratio of micropores to mesopores was in the range of 0.50 to 0.90. The linear relationship between water adsorption amount and the pore volume of micropores and small mesopores (< 5 nm) was observed, showing that water molecules are adsorbed even in small mesopores by the cluster-mediated filling mechanism as well as in micropores.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Nanopore and Nanochannel Transport Studies · Carbon Nanotubes in Composites · Graphene research and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (20)
Show source-provided references
1. The state of monolayers adsorbed at the interface solid-aqueous solution10.1021/ja01869a029 ↗
2. Ultrahigh-vacuum techniques in the measurement of contact angles. LEED study of the effect of structure on the wettability of graphite10.1021/j100458a021 ↗
3. Marked adsorption irreversibility of graphitic nanoribbons for CO2 and H2O10.1021/ja205832z ↗
4. Experimental study of water adsorption on activated carbons10.1021/la980492h ↗
5. Water capture in carbon cuboids10.1038/nchem.2193 ↗
6. Hysteresis-associated pressure-shift-induced water adsorption in carbon micropores10.1021/la000175m ↗
7. Lack of a predominant adsorption of water vapor on carbon mesopores10.1021/la970498r ↗
8. Affinity transformation from hydrophilicity to hydrophobicity of water molecules on the basis of adsorption of water in graphitic nanopores10.1021/ja038842w ↗
9. Combining nitrogen, argon, and water adsorption for advanced characterization of ordered mesoporous carbons (CMKs) and periodic mesoporous organosilicas (PMOs)10.1021/la402832b ↗
10. Quenched solid density functional theory and pore size analysis of micro-mesoporous carbons10.1016/j.carbon.2009.01.050 ↗
11. Porosity evaluation of intrinsic intraparticle nanopores of single wall carbon nanohorns10.1021/nl015509m ↗
12. Physical adsorption characterization of nanoporous materials10.1002/cite.201000064 ↗
13. Filled and heterogenous nanotubes
14. Selective probe of the morphology and local vibrations at carbon nanoasperities10.1063/1.3682771 ↗
15. Individual single-walled nanotubes and hydrogels made by oxidative exfoliation of carbon nanotube ropes10.1021/ja0344516 ↗
16. Functionalization of single-walled carbon nanotubes with 1,4-benzenediamine using a diazonium reaction10.1021/jp076935k ↗
17. Chand Bansal · 1988
18. Cluster-mediated filling of water vapor in intratube and interstitial nanospaces of single-wall carbon nanohorns10.1016/S0009-2614(02)01476-8 ↗
19. The effect of the gradual thermal decomposition of surface oxygen species on the chemical and catalytic properties of oxidized activated carbon10.1016/S0008-6223(02)00188-4 ↗
20. Equilibration-time and pore-width dependent hysteresis of water adsorption isotherm on hydrophobic microporous carbons10.1016/j.carbon.2009.09.008 ↗