Hiroyuki Ohde

Synthesizing silver halide nanoparticles in supercritical carbon dioxide utilizing a water-in-CO2 microemulsion

Ionic species can be stabilized in the water core of a water-in-CO2 microemulsion in supercritical fluid CO2; by mixing two microemulsions containing Ag+ and X− ions separately, silver halide (AgX) nanoparticles were synthesized in supercritical CO2; the water-in-CO2 microemulsion may provide a reaction system for a wide range of nanoparticle syntheses involving ionic species in supercritical CO2.

Catalytic hydrogenation of arenes with rhodium nanoparticles in a water-in-supercritical CO2 microemulsion

Rhodium nanoparticles dispersed by a CO2 microemulsion are effective catalysts for rapid hydrogenation of arenes in supercritical CO2.

A high pressure fiber-optic reactor with charge-coupled device array ultraviolet-visible spectrometer for monitoring chemical processes in supercritical fluids

A versatile spectroscopic reaction monitoring system for high-pressure liquids and supercritical fluids is described. The cell is designed to be attached to a charge-coupled device array ultraviolet-visible spectrometer via fiber optics, and has been shown to be capable of monitoring high speed reactions and rate of dissolution of a variety of compounds. The design is simple, inexpensive, rugged, and self-aligning. The cell has been tested up to 300 atm and 100 °C without failure.