| Publication type: | Article in scientific journal |
| Type of review: | Peer review (publication) |
| Title: | Experimental observation of critical depletion : nitrous oxide adsorption on silica gel |
| Authors: | Rajendran, Arvind Hocker, Thomas Di Giovanni, Orazio Mazzotti, Marco |
| DOI: | 10.1021/la025696j |
| Published in: | Langmuir |
| Volume(Issue): | 18 |
| Issue: | 25 |
| Page(s): | 9726 |
| Pages to: | 9734 |
| Issue Date: | 2002 |
| Publisher / Ed. Institution: | American Chemical Society |
| ISSN: | 0743-7463 1520-5827 |
| Language: | English |
| Subjects: | Critical; Phenomena; Supercritical; Adsorption |
| Subject (DDC): | 530: Physics 621.3: Electrical, communications, control engineering |
| Abstract: | The adsorption of nitrous oxide (N2O) on silica gel has been studied using a gravimetric apparatus under near critical conditions. In gravimetric measurements, the determination of the excess amount adsorbed depends on a buoyancy correction factor which accounts for the volumes of the adsorbent and the solid parts in the cell. The accurate measurement of the volume of the sorbent and the metal parts in the measuring cell plays an important role in the precise measurement of the excess adsorbed amount especially at high densities. To this aim, a new protocol has been proposed which accounts for non-negligible helium adsorption and thermal expansion of the sorbent and the solid parts of the balance. Helium isochores under moderate temperature and densities have been experimentally measured. The adsorption behavior of helium has been characterized using a nonlinear mobile adsorption model. The proposed protocol has then been applied for the measurement of the excess adsorbed amount of supercritical N2O on silica gel very close to the critical point. Clear experimental evidence of critical depletion, i.e., the decrease of the excess adsorption along an isochore with decreasing temperature, has been obtained. Unlike the previous observation, where critical depletion was seen only in the direct vicinity of the critical isochore, in the present study this is observed on isochores in the range of 0.74 to 1.15. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/1657 |
| Fulltext version: | Published version |
| License (according to publishing contract): | Licence according to publishing contract |
| Departement: | School of Engineering |
| Organisational Unit: | Institute of Computational Physics (ICP) |
| Appears in collections: | Publikationen School of Engineering |
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Rajendran, A., Hocker, T., Di Giovanni, O., & Mazzotti, M. (2002). Experimental observation of critical depletion : nitrous oxide adsorption on silica gel. Langmuir, 18(25), 9726–9734. https://doi.org/10.1021/la025696j
Rajendran, A. et al. (2002) ‘Experimental observation of critical depletion : nitrous oxide adsorption on silica gel’, Langmuir, 18(25), pp. 9726–9734. Available at: https://doi.org/10.1021/la025696j.
A. Rajendran, T. Hocker, O. Di Giovanni, and M. Mazzotti, “Experimental observation of critical depletion : nitrous oxide adsorption on silica gel,” Langmuir, vol. 18, no. 25, pp. 9726–9734, 2002, doi: 10.1021/la025696j.
RAJENDRAN, Arvind, Thomas HOCKER, Orazio DI GIOVANNI und Marco MAZZOTTI, 2002. Experimental observation of critical depletion : nitrous oxide adsorption on silica gel. Langmuir. 2002. Bd. 18, Nr. 25, S. 9726–9734. DOI 10.1021/la025696j
Rajendran, Arvind, Thomas Hocker, Orazio Di Giovanni, and Marco Mazzotti. 2002. “Experimental Observation of Critical Depletion : Nitrous Oxide Adsorption on Silica Gel.” Langmuir 18 (25): 9726–34. https://doi.org/10.1021/la025696j.
Rajendran, Arvind, et al. “Experimental Observation of Critical Depletion : Nitrous Oxide Adsorption on Silica Gel.” Langmuir, vol. 18, no. 25, 2002, pp. 9726–34, https://doi.org/10.1021/la025696j.
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