Facile synthesis of magnetic agarose microfibers by directed self-assembly in W/O emulsions

作者：Aldana Samuel; Vereda Fernando; Hidalgo Alvarez Roque; de Vicente Juan^*

来源：Polymer, 2016, 93: 61-64.

DOI：10.1016/j.polymer.2016.04.010

• Magnetic particles
• Microfibers
• Agarose
• Emulsions
• Ferrofluids

We propose a new versatile approach for the fabrication of flexible magnetic microfibers having tunable size and mechanical properties. The methodology is based on the magnetic field-driven self-assembly of agarose-loaded kinetically unstable aqueous ferrofluid-in-oil emulsions. Agarose is dissolved at a temperature above its gelling point in an aqueous ferrofluid and the resulting suspension is then emulsified in oil and later exposed to a DC uniaxial magnetic field. Once the fibers have formed, the emulsion is quenched to force the gelification of the agarose, and a second addition of surfactant is carried out to prevent lateral aggregation of the fibers. Resulting fibers have diameters of the order of a few to tens of micrometers. A phase diagram is constructed and the influence of surfactant concentration and residence time under field in the synthesis is discussed.

• 出版日期2016-6-14