Composition dependent non-ideality in aqueous binary mixtures as a signature of avoided spinodal decomposition View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2015-01

AUTHORS

SARMISTHA SARKAR, SAIKAT BANERJEE, SUSMITA ROY, RIKHIA GHOSH, PARTHA PRATIM RAY, BIMAN BAGCHI

ABSTRACT

We explore the potential energy landscape of structure breaking binary mixtures (SBBM) where two constituents dislike each other, yet remain macroscopically homogeneous at intermediate to high temperatures. Interestingly, we find that the origin of strong composition dependent non-ideal behaviour lies in its phase separated inherent structure. The inherent structure (IS) of SBBM exhibits bi-continuous phase as is usually formed during spinodal decomposition. We draw analogy of this correlation between non-ideality and phase separation in IS to explain observation of non-ideality in real aqueous mixtures of small amphiphilic solutes, containing both hydrophilic and hydrophobic groups. Although we have not been able to obtain IS of these liquids, we find that even at room temperature these liquids sustain formation of fluctuating, transient bi-continuous phase, with limited lifetime (τ≲20 ps). While in the model (A, B) binary mixture, the non-ideal composition dependence can be considered as a fluctuation from a phase separated state, a similar scenario is expected to be responsible for the unusually strong non-ideality in these aqueous binary mixtures. Graphical AbstractOur main observation is that the occurrence of strong non-ideality in many binary mixtures is due to the existence of a transient phase separation. The presence of the inter-penetrating percolating networks provides a striking resemblance to spinodal decomposition. Our main observation is that the occurrence of strong non-ideality in many binary mixtures is due to the existence of a transient phase separation. The presence of the inter-penetrating percolating networks provides a striking resemblance to spinodal decomposition. More... »

PAGES

49-59

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12039-014-0749-y

DOI

http://dx.doi.org/10.1007/s12039-014-0749-y

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1015235341


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