Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Composition inversion in mixtures of binary colloids and polymer   Understanding the phase behaviour of mixtures continues to pose challenges,
even for systems that might be considered "simple". Here we consider a very
simple mixture of two colloidal and one non-adsorbing polymer species which can
be simplified even further to a size-asymmetrical binary mixture, in which the
effective colloid-colloid interactions depend on the polymer concentration. We
show that this basic system exhibits surprisingly rich phase behaviour. In
particular, we enquire whether such a system features only a liquid-vapor phase
separation (as in one-component colloid-polymer mixtures) or whether,
additionally, liquid-liquid demixing of two colloidal phases can occur.
Particle-resolved experiments show demixing-like behaviour, but when combined
with bespoke Monte Carlo simulations, this proves illusory, and we reveal that
only a single liquid-vapor transition occurs. Progressive migration of the
small particles to the liquid phase as the polymer concentration increases
gives rise to composition inversion - a maximum in the large particle
concentration in the liquid phase. Near criticality the density fluctuations
are found to be dominated by the larger colloids.

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The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: physics