Shibayama Lab

It can be used in combination with organizational transparency technology in joint research with Yasumi Ueda, Team Leader of RIKEN (Professor, Department of Systems Pharmacology, Graduate School of Medicine, The University of Tokyo), and Visiting Researcher Etsue Suzaki (Associate Professor). Established "CUBIC-HistoVIsion (CUBIC-HV)", a 3D tissue staining and observation technology for organ and whole body scale.

We used small-angle X-ray scattering to measure the brain before and after clearing and found that the brain was an electrolyte gel and that clearing removed lipids.

It was found that by densely filling the polymer in the solution before gelation, it is possible to maintain a uniformly dispersed state even after gelation. Such a gelation process is called bond percolation and has been considered as a theory for a long time, but it was realized for the first time in an actual system.

With such a simple method, we succeeded in synthesizing an extremely uniform gel that overturns the common sense of soft materials.

This method can be applied to a wide range of polymer species, and is expected to have a ripple effect in a wide range of fields such as medicine, pharmacy, chemistry, and optics.

Nafion is a fluorocarbon polymer that has been actively used for a long time, but the correlation between its physical properties and structure is still unclear.

This time, the sample preparation conditions were made exactly the same, and light scattering, small-angle X-ray scattering, and small-angle rheo small-angle neutron scattering were carried out over a wide concentration range of 0.5-30 wt% to obtain universal Nafion solution properties and nano-scale properties. The structure was clarified.  

The critical state immediately before gelation has attracted many physicists' interest due to its universality, and many studies have been conducted. Among them, the origin of the slow motion mode proportional to the cube of the scattering vector q was left as an unsolved problem.

In this systematic study, this slow motion mode is completely unrelated to the conventional dogma Zimm mode (one of the internal motions of polymers), and the translational motion of critical clusters with power distribution It was clarified that it was the addition of.