Rapid expansion of supercritical suspensions was used for the first time to push apart the
layers in a layered metal hydroxide structure. Treatment with supercritical CO 2 resulted in
significant changes in interlayer distances in yttrium hydroxide intercalated with dodecyl
sulfate anions. According to XRD, SEM, TEM, nitrogen adsorption and IR-spectroscopy
measurements, the structure and composition of the layered material depended
substantially on the pressure of supercritical CO 2. Low pressure treatment (75–200 atm) …