Add time:07/27/2019         Source:sciencedirect.com

Rapid expansion of supercritical suspensions was used for the first time to push apart the layers in a layered metal hydroxide (cas 12040-73-2) structure. Treatment with supercritical CO2 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 CO2. Low pressure treatment (75–200 atm) resulted in a significant increase (by 20%) in the interlayer distance, while higher pressures did not affect the interlayer distance, but increased the specific surface area of the material (from ∼10 to 74 m2/g). Supercritically treated layered yttrium hydroxide exfoliated readily in toluene under ultrasonication. The re-assembly of exfoliated layers upon solvent evaporation was identified using time-resolved XRD. No effect of supercritical CO2 treatment was observed for layered yttrium hydroxide intercalated with nitrate, oleate and stearate anions.

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