Abstract
The Fe3O4 ferrofluid emulsions were prepared by using Fe3O4 ferrofluids, the sodium dodecyl sulfate (SDS), and distilled water. The droplet size was controlled by Fe3O4 ferrofluids and surfactant concentration. An order–disorder transition was observed upon applying a perpendicular magnetic field. Below a certain critical field strength a disordered structure is observed, while above the critical field the stable hexagonal structure is formed. The distance between the droplet columns forming this structure is found to decrease approximately linearly with increasing field strength. The hexagonal pattern persists even after the field is turned off, i.e., mutual interactions between the droplets are here stronger than thermal fluctuations in the water carrier. In parallel applied fields, the distance between columns decreases as the strength of external magnetic field increases. Quasiperiodic chains with no lateral aggregation were formed in parallel applied field.
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