Effects of magnetic field on water investigated with fluorescent probes

Aqueous solutions with dissolved fluorescent probes were exposed to a magnetic field, and the effects of the magnetic exposure were investigated by measuring the fluorescence emission intensity with a spectrofluorophotometer. The data were compared with those of magnetic exposure effects on colloidal solutions reported previously [K. Higashitani, K. Okuhara and S. Hatade, J. Colloid Interface Sci., 152 (1992) 125; K. Higashitani, H. Isari, K. Okuhara, A. Kage and S. Hatade, J. Colloid Interface Sci., 172 (1995) 383]. It is found that (1) the degree of magnetic effects increases with the magnetic exposure and becomes constant at a certain exposure time in the case of solutions of fluorescent probes with an alkyl chain, but no effect was observed for solutions of probes without an alkyl chain; (2) the magnetic effects decay with the concentration of alcohol in the solution, the solution temperature, and the standing time of the solution after the magnetic exposure; and (3) if it is presumed that an ordered structure of water molecules around the hydrophobic chain of probes is formed by the magnetic exposure, not only are the results in the present study but also are our previous results for colloidal particles explained consistently.