Freezing Point Curve of Dimethyl Sulfoxide—Water Solutions

The apparent freezing points have been determined for solutions of dimethyl sulfoxide and water. Several of the samples exhibited increasing viscosity as they were cooled and, at their solidification points, formed amorphous glasses rather than crystalline solids. It is proposed that these glasses form because of a modified lattice structure built of dimethyl sulfoxide and water molecules. The eutectic composition occurs in the region of 0.3 M dimethyl sulfoxide. The apparent freezing points have been determined for solutions of dimethyl sulfoxide and water. Several of the samples exhibited increasing viscosity as they were cooled and, at their solidification points, formed amorphous glasses rather than crystalline solids. It is proposed that these glasses form because of a modified lattice structure built of dimethyl sulfoxide and water molecules. The eutectic composition occurs in the region of 0.3 M dimethyl sulfoxide.