@article{oai:niigata-u.repo.nii.ac.jp:00002631, author = {Misawa, M. and Dairoku, I. and Honma, A. and Yamada, Y. and Sato, T. and Maruyama, K. and Mori, K. and Suzuki, S. and Otomo, T.}, issue = {10}, journal = {The journal of chemical physics, The journal of chemical physics}, month = {Sep}, note = {Mesoscale structure of 1-propanol aqueous solutions with propanol mole fraction xp ranging from 0.1 to 0.33 has been studied by means of small angle neutron scattering (SANS) and large-scale reverse Monte Carlo (RMC) technique. Analysis of the SANS intensities in terms of a fractal model shows that the fractal dimension df of mesoscale structure of the solution is about 1.8–1.9 for water-rich solution and about 1.5 for propanol-rich solution. Percolation analysis on the RMC results reveals that the water molecules and the propanol molecules cluster, respectively, as a mass fractal, the dimension dM of which is about 2.3–2.5 for both clusters for water-rich solution. Furthermore, the distribution of the cluster size is expressed by a simple power law with an exponent τ of about 1.35–1.5 for the propanol clusters and 1.05–1.2 for the water clusters. These results imply that the current solution is characterized by polydisperse mass fractals. In fact, a theoretical relation for polydisperse system of mass fractals, df=dM(2-τ), holds well in the current solution. The characteristic change in df from 1.8–1.9 to 1.5 described above is attributed to the crossover between the water-rich regime and the propanol-rich regime. Most of the water molecules and the propanol molecules are located on the interface between clusters, and the water molecules form thin layers of about 10 Å thick irrespective of 1-propanol content studied.}, pages = {4716--4723}, title = {Mass-fractal clustering and powder-law decay of cluster size in 1-propanol aqueous solution}, volume = {121}, year = {2004} }