Cavitation in Metastable Liquid Nitrogen Confined to Nanoscale Pores.

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Rasmussen CJ, Vishnyakov A, Thommes M, Smarsly BM, Kleitz F, Neimark AV
Zeitschrift: Langmuir
Verlag: American Chemical Society
Jahr der Veröffentlichung: 2010
Band: 26
Heftnummer: 12
Seitenbereich: 10147-10157-10157
ISSN: 0743-7463
eISSN: 1520-5827


Abstract

We studied cavitation in metastable fluids drawing on the example of liq. nitrogen confined to spheroidal pores of specially prepd. well-characterized mesoporous silica materials with mean pore diams. ranging from ∼6 to ∼35 nm. Cavitation was monitored in the process of evapn./desorption from fully satd. samples with gradually decreasing vapor pressure at the isothermal conditions. The onset of cavitation was displayed by a sharp step on the desorption isotherm. We found that the vapor pressure at the onset of cavitation depended on the pore size for the samples with pores smaller than ∼11 nm and remained practically unchanged for the samples with larger pores. We suggest that the obsd. independence of the cavitation pressure on the size of confinement indicates that the conditions of bubble nucleation in pores larger than ∼11 nm approach the nucleation conditions in the bulk metastable liq. To test this hypothesis and to evaluate the nucleation barriers, we performed grand canonical and gauge cell Monte Carlo simulations of nitrogen adsorption and desorption in spherical silica pores ranging from 5.5 to 10 nm in diam. Simulated and exptl. adsorption isotherms were in good agreement. Exploiting the correlation between the exptl. cavitation pressure and the simulated nucleation barrier, we found that the nucleation barrier increased almost linearly from ∼40 to ∼70 kBT in the range of pores from ∼6 to ∼11 nm, and varied in diapason of 70-75 kBT in larger pores, up to 35 nm. We constructed the dependence of the nucleation barrier on the vapor pressure, which asymptotically approaches the predictions of the classical nucleation theory for the metastable bulk liq. at larger relative pressures (>0.6). Our findings suggest that there is a limit to the influence of the confinement on the onset of cavitation, and thus, cavitation of nanoconfined fluids may be employed to explore cavitation in macroscopic systems. [on SciFinder(R)]


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Zitierweisen

APA:
Rasmussen, C.J., Vishnyakov, A., Thommes, M., Smarsly, B.M., Kleitz, F., & Neimark, A.V. (2010). Cavitation in Metastable Liquid Nitrogen Confined to Nanoscale Pores. Langmuir, 26(12), 10147-10157-10157. https://dx.doi.org/10.1021/la100268q

MLA:
Rasmussen, Christopher J., et al. "Cavitation in Metastable Liquid Nitrogen Confined to Nanoscale Pores." Langmuir 26.12 (2010): 10147-10157-10157.

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