Vinothan N. Manoharan, Guruswamy Kumaraswamy, Madivala G. Basavaraj, Sanat Kumar, Siddharth Kulkarni, Ranjini Bandyopadhyay, Sudeep Punnathanam, Ajeet Srivastav, Lola Gonzalez-Garcia, G V Pavan Kumar, Daan Frenkel, Radhika Poojari, Priyadarshi Roy Chowdhury, Gourav Shrivastav, Mukta Tripathy, Vimala Sridurai, Alison Edwards, Madhura Som, B. L. V Prasad, Lynn Walker, Neena S. John, Yon Ju-Nam, Yogesh M. Joshi, Nirmalya Bachhar, Charusita Chakravarty, Rajdip Bandyopadhyaya, Zakiya Shireen, Nicholas Kotov, Oleg Gang, Alamgir Karim, Mario Tagliazucchi, Erika Eiser and Andrea Tao

Fluids with competing short range attraction and long range repulsive interactions between the particles can exhibit a variety of microphase separated structures. We develop a lattice-gas (generalised Ising) model and analyse the phase diagram using Monte Carlo computer simulations and also with density functional theory (DFT). The DFT predictions for the structures formed are in good agreement with the results from the simulations, which occur in the portion of the phase diagram where the theory predicts the uniform fluid to be linearly unstable. However, the mean-field DFT does not correctly describe the transitions between the different morphologies, which the simulations show to be analogous to micelle formation. We determine how the heat capacity varies as the model parameters are changed. There are peaks in the heat capacity at state points where the morphology changes occur. We also map the lattice model onto a continuum DFT that facilitates a simplification of the stability analysis of the uniform fluid.

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Applications to Soft Matter: general discussion

Citations

Two-dimensional colloidal fluids exhibiting pattern formation

References

Two-dimensional colloidal fluids exhibiting pattern formation