CF4 ADSORPTION ON OPEN CARBON NANOHORNS AGGREGATES

We have measured adsorption isotherms at ten different temperatures from 90.432 K to 163.812 K for CF4 on a sample of chemically-opened carbon nanohorns. The interior of the individual nanohorns is accessible to sorbates in these chemically opened nanohorns. Two substeps are visible in the adsorpti...

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Main Author: Khanal, Pravin
Format: Others
Published: OpenSIUC 2016
Online Access:https://opensiuc.lib.siu.edu/theses/1910
https://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=2924&context=theses
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spelling ndltd-siu.edu-oai-opensiuc.lib.siu.edu-theses-29242018-12-20T04:35:43Z CF4 ADSORPTION ON OPEN CARBON NANOHORNS AGGREGATES Khanal, Pravin We have measured adsorption isotherms at ten different temperatures from 90.432 K to 163.812 K for CF4 on a sample of chemically-opened carbon nanohorns. The interior of the individual nanohorns is accessible to sorbates in these chemically opened nanohorns. Two substeps are visible in the adsorption data, one corresponding to groups of stronger binding sites (lower pressure substep) and another corresponding to weaker binding sites (higher pressure substep). The stronger binding sites are interstitial pores and intra nanohorns pores and the weaker binding sites are outer surfaces and interior sites away from the tips. We have found that the isosteric heat is a decreasing function of coverage. Results for the effective specific surface area (≈969 m^2/gm), kinetics of adsorption, and the isosteric heat of adsorption as a function of sorbate loading will be presented. Comparison to absorption results for other sorbates on open carbon nanohorns will be discussed. 2016-05-01T07:00:00Z text application/pdf https://opensiuc.lib.siu.edu/theses/1910 https://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=2924&context=theses Theses OpenSIUC
collection NDLTD
format Others
sources NDLTD
description We have measured adsorption isotherms at ten different temperatures from 90.432 K to 163.812 K for CF4 on a sample of chemically-opened carbon nanohorns. The interior of the individual nanohorns is accessible to sorbates in these chemically opened nanohorns. Two substeps are visible in the adsorption data, one corresponding to groups of stronger binding sites (lower pressure substep) and another corresponding to weaker binding sites (higher pressure substep). The stronger binding sites are interstitial pores and intra nanohorns pores and the weaker binding sites are outer surfaces and interior sites away from the tips. We have found that the isosteric heat is a decreasing function of coverage. Results for the effective specific surface area (≈969 m^2/gm), kinetics of adsorption, and the isosteric heat of adsorption as a function of sorbate loading will be presented. Comparison to absorption results for other sorbates on open carbon nanohorns will be discussed.
author Khanal, Pravin
spellingShingle Khanal, Pravin
CF4 ADSORPTION ON OPEN CARBON NANOHORNS AGGREGATES
author_facet Khanal, Pravin
author_sort Khanal, Pravin
title CF4 ADSORPTION ON OPEN CARBON NANOHORNS AGGREGATES
title_short CF4 ADSORPTION ON OPEN CARBON NANOHORNS AGGREGATES
title_full CF4 ADSORPTION ON OPEN CARBON NANOHORNS AGGREGATES
title_fullStr CF4 ADSORPTION ON OPEN CARBON NANOHORNS AGGREGATES
title_full_unstemmed CF4 ADSORPTION ON OPEN CARBON NANOHORNS AGGREGATES
title_sort cf4 adsorption on open carbon nanohorns aggregates
publisher OpenSIUC
publishDate 2016
url https://opensiuc.lib.siu.edu/theses/1910
https://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=2924&context=theses
work_keys_str_mv AT khanalpravin cf4adsorptiononopencarbonnanohornsaggregates
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