Abstract
Magnetic field effects were studied on the temperature-induced phase change for the sol–gel systems including the natural high polymer agarose or methyl cellulose. Aqueous agarose and methyl cellulose were set to gel on cooling and heating, respectively. The gel melting temperature T m was observed after the gels were formed under the influence of magnetic fields up 5 T. The magnetic field exposure resulted in 1.0 K rise in T m for agarose gels and 3.5 K lowering in T m for methyl cellulose gels. The magnetic effects became remarkable with the decrease of polymer concentration. The changes in melting temperature saturated at about 3 T. The birefringence for the 0.5 wt.% agarose gels which were formed in different magnetic fields increased with increasing magnetic field but saturated at about 3 T. The exposure of magnetic fields causes the alignment of the polymers and leads to a stable structure of the gels.
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