Field-Induced Structures in Ferrofluid Emulsions
| Autor: | Jing Liu, Johan Richard, E. M. Lawrence, K. Javier, Mark L. Ivey, J. Bibette, A. Wu, G. A. Flores |
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| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 74:2828-2831 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.74.2828 |
| Popis: | The field-induced structure in a monodisperse ferrofluid emulsion is studied. An applied magnetic field induces a magnetic dipole moment in each droplet. When the dipole-dipole interaction energy exceeds the thermal energy, a phase transition occurs as the fluid of randomly dispersed droplets changes to a solid of nearly equally sized and spaced columns. Our results show that the column spacing follows a relation ${d\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.33L}^{0.37}$ for cell thickness $3\ensuremath{\le}L\ensuremath{\le}800\ensuremath{\mu}\mathrm{m}$. A new theory, which treats the column shape more realistically, is developed to account for the results. |
| Databáze: | OpenAIRE |
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