Press Releases


Universal Equation of State Describes Osmotic Pressure throughout Gelation Process : Project Assistant Professor Naoyuki Sakumichi, Takashi Yasuda (M2), Professor Takamasa Sakai, Department of Bioengineering, and other researchers.

The equation of state of the osmotic pressure for linear-polymer solutions in good solvents is universally described by a scaling function. We experimentally measure the osmotic pressure of the gelation process via osmotic deswelling. We find that the same scaling function for linear-polymer solutions also describes the osmotic pressure throughout the gelation process involving both the sol and gel states. Furthermore, we reveal that the osmotic pressure of polymer gels is universally governed by the semidilute scaling law of linear-polymer solutions.

Physical Review Letters :