Direct Observation of Homogeneous Cavitation in Nanopores

Doebele, Victor; Benoit-Gonin, A.; Souris, Fabien; Cagnon, Laurent; Spathis, Panayotis; Wolf, P. E.; Grosman, A.; Bossert, Marine; Trimaille, I.; Rolley, E.

doi:10.1103/physrevlett.125.255701

Cited by 7 publications

(37 citation statements)

References 44 publications

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“…For large enough pores [5], this evaporation pressure is found to be consistent with the classical nucleation theory (CNT) for bulk liquid [6]. Using porous alumina as a model system, we have recently shown that the evaporation threshold is independent of the pore aperture diameter and consistent with CNT, providing a direct evidence for homogeneous cavitation [7].…”

Section: Introductionsupporting

confidence: 70%

“…First, the evaporation pressure is almost independent of the reduction of the pore mouth. This was demonstrated for hexane at room temperature [7]. We have checked that this holds for nitrogen at 77 K. As shown in Fig.…”

Section: Tionsupporting

confidence: 63%

“…This sample had been previously used for the hexane experiments reported in Ref. 7. In this case, instead of using ALD, the pore mouth was reduced by evaporating a 2 nm Al layer which is subsequently oxidized, this procedure being repeated 8 times [7].…”

Section: Figmentioning

confidence: 99%

“…7. In this case, instead of using ALD, the pore mouth was reduced by evaporating a 2 nm Al layer which is subsequently oxidized, this procedure being repeated 8 times [7]. As illustrated by the hysteresis loops in Fig.…”

Section: Figmentioning

confidence: 99%

“…However, this hypothesis is contradictory with the fact that both fluids wet silicon. Moreover, it does not account for the surprising strong dependence of the evaporation threshold on the pore length and diameter [7,9]. Another classical explanation for a well defined evaporation threshold is that it follows from a percolation phenomenon in a disordered pore network [10].…”

Section: Introductionmentioning

confidence: 99%

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Evaporation Process in Porous Silicon: Cavitation vs Pore Blocking

et al. 2021

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We have measured sorption isotherms for helium and nitrogen in wide temperature ranges and for a series of porous silicon samples, both native samples and samples with reduced pore mouth so that the pores have an ink-bottle shape. Combining volumetric measurements and sensitive optical techniques, we show that, at high temperature, homogeneous cavitation is the relevant evaporation mechanism for all samples. At low temperature, the evaporation is controlled by meniscus recession, the detailed mechanism being dependent on the pore length and on the mouth reduction. Native samples and samples with ink-bottle pores shorter than one micrometer behave as an array of independent pores. In contrast, samples with long ink-bottle pores exhibit long-range correlations between pores. In this latter case, evaporation takes place by a collective percolation process and not by heterogeneous cavitation as previously proposed. The variety of evaporation mechanisms points to porous silicon being an anisotropic three dimensional pore network rather than an array of straight independent pores.

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Section: Introductionsupporting

confidence: 70%

Section: Tionsupporting

confidence: 63%