Finite size effects on the phase diagram of a binary mixture confined between competing walls
A symmetrical binary mixture AB that exhibits a critical temperature T<sub>cb</sub> of phase separation into an A- and a B-rich phase in the bulk is considered in a geometry confined between two parallel plates a distance D apart. It is assumed that one wall preferentially attracts A whi...
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| Autores principales: | , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2000
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/129677 |
| Aporte de: |
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I19-R120-10915-129677 |
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dspace |
| institution |
Universidad Nacional de La Plata |
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I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Física binary mixture phase diagram competing walls |
| spellingShingle |
Ciencias Exactas Física binary mixture phase diagram competing walls Müller, Marcus Binder, Kurt Albano, Ezequiel Vicente Finite size effects on the phase diagram of a binary mixture confined between competing walls |
| topic_facet |
Ciencias Exactas Física binary mixture phase diagram competing walls |
| description |
A symmetrical binary mixture AB that exhibits a critical temperature T<sub>cb</sub> of phase separation into an A- and a B-rich phase in the bulk is considered in a geometry confined between two parallel plates a distance D apart. It is assumed that one wall preferentially attracts A while the other wall preferentially attracts B with the same strength (“competing walls”). In the limit D → ∞, one then may have a wetting transition of first-order at a temperature T<sub>w</sub>, from which prewetting lines extend into the one phase region both of the A- and the B-rich phase. It is discussed how this phase diagram gets distorted due to the finiteness of D: the phase transition at T<sub>cb</sub> immediately disappears for D < ∞ due to finite size rounding, and the phase diagram instead exhibit two two-phase coexistence regions in a temperature range T<sub>trip</sub> < T < T<sub>c</sub>₁ = T<sub>c</sub>₂. In the limit D → ∞ T<sub>c</sub>₁,T<sub>c</sub>₂ become the prewetting critical points and T<sub>trip</sub> →T<sub>w</sub>. For small enough D it may occur that at a tricritical value D<sub>t</sub> the temperatures T<sub>c</sub>₁ = T<sub>c</sub>₂ and T<sub>trip</sub> merge, and then for D < D<sub>t</sub> there is a single unmixing critical point as in the bulk but with T<sub>c</sub>(D) near T<sub>w</sub>. As an example, for the experimentally relevant case of a polymer mixture a phase diagram with two unmixing critical points is calculated explicitly from self-consistent field methods. |
| format |
Articulo Articulo |
| author |
Müller, Marcus Binder, Kurt Albano, Ezequiel Vicente |
| author_facet |
Müller, Marcus Binder, Kurt Albano, Ezequiel Vicente |
| author_sort |
Müller, Marcus |
| title |
Finite size effects on the phase diagram of a binary mixture confined between competing walls |
| title_short |
Finite size effects on the phase diagram of a binary mixture confined between competing walls |
| title_full |
Finite size effects on the phase diagram of a binary mixture confined between competing walls |
| title_fullStr |
Finite size effects on the phase diagram of a binary mixture confined between competing walls |
| title_full_unstemmed |
Finite size effects on the phase diagram of a binary mixture confined between competing walls |
| title_sort |
finite size effects on the phase diagram of a binary mixture confined between competing walls |
| publishDate |
2000 |
| url |
http://sedici.unlp.edu.ar/handle/10915/129677 |
| work_keys_str_mv |
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Repositorios |
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