Effects of magnetic exposure on aqueous systems have been investigated employing colloidal particles, an atomic force microscope (AFM), fluorescent probes and others. A series of quantitative and reproducible data on the magnetic effects has been obtained by well controlled experiments. The followings were found: (1) the magnetic exposure reduces the rapid coagulation rate, the zeta potential and diffusivity of colloids, (2) the exposure affects the formation of CaC03 crystals, (3) the exposure thickens the adsorbed layer on the surface in electrolyte solution and reduces the potential of solid surface, which are clarified by AFM measurements, (4) the exposure increases the emission intensity of fluorescent probes with a long carbon chain in solutions, (5) there exists a memory in the magnetic effects. It is postulated from these results that the magnetic effects are attributable to the stabilization of the water molecules adsorbed on the solid surface and those hydrated around structure-disordering ions.
