Salt-induced phase separation in aqueous solution

KCl-induced phase separation phenomenon in I-propanol aqueous solution has been studied by means of small angle (SANS) and quasi-elastic neutron scatt ering measurements. The significant increase of SANS intensity by the addit ion of KCI is attributed to the aggregate of clusters, of which the fractal nature of dimension 1.8-1.9 is found. The motion of water molecules is muc h suppressed in the l-propanol-water solution, while it is slightly recover ed by the addition of KCl. The aggregate of clusters and liquid-liquid phas e separation are discussed in relation to the motion of water molecules, (C ) 1999 Elsevier Science Ltd, All rights reserved.