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Abstract / Description of output
We present a lattice gas model to show that a system of amphiphilic molecules in solution forms clusters without phase separating. This is designed to be the simplest possible model that captures the essence of the so-called microclustering observed both experimentally and by molecular-dynamics computer simulation of methanol in water. The Hamiltonian contains no adjustable parameters, yet exhibits surprisingly complex behavior as a function of temperature and concentration. By studying the specific heat, we reveal three phase boundaries-between a low-temperature phase comprising straight bilayers, intermediate phases exhibiting twisted bilayer and clustering, and a high-temperature phase, which is essentially gaslike. None of the observed phases correspond to the crystalization or phase separation expected of a simple mixture; instead, they correspond to loss of different types of entropy.
Original language | English |
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Article number | 021504 |
Pages (from-to) | - |
Number of pages | 5 |
Journal | Physical Review E |
Volume | 73 |
Issue number | 2 |
DOIs | |
Publication status | Published - Feb 2006 |
Keywords / Materials (for Non-textual outputs)
- MICELLAR BINARY-SOLUTIONS
- ASSOCIATION
- HYDRATION
- MIXTURES
- MODEL
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