Decay dynamics of a single spherical domain in near-critical phase-separated conditions
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916274142969856 |
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| author | Saiseau, Raphael Truong, Henri Guérin, Thomas Delabre, Ulysse Delville, Jean-Pierre |
| author_facet | Saiseau, Raphael Truong, Henri Guérin, Thomas Delabre, Ulysse Delville, Jean-Pierre |
| contents | Domain decay is at the heart of the so-called evaporation-condensation Ostwald-ripening regime of phase ordering kinetics, where the growth of large domains occurs at the expense of smaller ones, which are expected to `evaporate'. We experimentally investigate such decay dynamics at the level of a single spherical domain picked from one phase in coexistence and brought into the other phase by an opto-mechanical approach, in a near-critical phase-separated binary liquid mixture. We observe that the decay dynamics is generally not compatible with the theoretically expected surface-tension decay laws for conserved order parameters. Using a mean-field description, we quantitatively explain this apparent disagreement by the gradient of solute concentrations induced by gravity close to a critical point. Finally, we determine the conditions for which buoyancy becomes negligible compared to capillarity and perform dedicated experiments that retrieve the predicted surface-tension induced decay exponent. The surface-tension driven decay dynamics of conserved order parameter systems in the presence and the absence of gravity, is thus established at the level of a single domain. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_04973 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Decay dynamics of a single spherical domain in near-critical phase-separated conditions Saiseau, Raphael Truong, Henri Guérin, Thomas Delabre, Ulysse Delville, Jean-Pierre Statistical Mechanics Soft Condensed Matter Domain decay is at the heart of the so-called evaporation-condensation Ostwald-ripening regime of phase ordering kinetics, where the growth of large domains occurs at the expense of smaller ones, which are expected to `evaporate'. We experimentally investigate such decay dynamics at the level of a single spherical domain picked from one phase in coexistence and brought into the other phase by an opto-mechanical approach, in a near-critical phase-separated binary liquid mixture. We observe that the decay dynamics is generally not compatible with the theoretically expected surface-tension decay laws for conserved order parameters. Using a mean-field description, we quantitatively explain this apparent disagreement by the gradient of solute concentrations induced by gravity close to a critical point. Finally, we determine the conditions for which buoyancy becomes negligible compared to capillarity and perform dedicated experiments that retrieve the predicted surface-tension induced decay exponent. The surface-tension driven decay dynamics of conserved order parameter systems in the presence and the absence of gravity, is thus established at the level of a single domain. |
| title | Decay dynamics of a single spherical domain in near-critical phase-separated conditions |
| topic | Statistical Mechanics Soft Condensed Matter |
| url | https://arxiv.org/abs/2402.04973 |