Electron spin resonance study of the freezing properties of water adsorbed on γ-alumina

Abstract

The e.s.r. spectrum of the manganese(II) ion has been investigated in bulk water and in water adsorbed on γ-alumina. The high mobility of the e.s.r. detectable ions shows that the water filling large pores in γ-alumina has the same viscosity as bulk water. On cooling, the viscosity of adsorbed water increases continuously even below the homogeneous nucleation temperature (–40°C), leading to the formation of an amorphous glass.