Preparation of acicular iron nanoparticles by the reduction of ferrous salt in the presence of tubular lecithin assemblies

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Abstract
Ferromagnetic α‐Fe particles were prepared by reduction of Fe2+ in the presence of tubular lecithin assemblies found in lecithin/cyclohexane/water association colloids. The particles consisted of both large single‐ and multi‐domain acicular rods, 0.25–5 μm in length with a length to width ratio of at least 6:1, encapsulated in lecithin. The coercivity depended on the reaction medium and ranged from 7 to 131 Oe. The highest coercivity particles were obtained in the cyclohexane‐rich region of the ternary phase diagram.