Hybridization produces the better: Colloidal hollow periodic mesoporous organosilica nanoparticles (HPMO NPs) with tunable compositions and highly hybridized nanostructures are successfully synthesized by a simple, easily scale-up but versatile silica-etching chemistry (alkaline or HF etching) for their applications in nano-fabrication and nano-medicine.

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The solubility of pyrene, chrysene, perylene, and benzo[ghi]perylene were determined at temperatures ranging from 313 K to 523 K and pressures from 100 bar to 450 bar in supercritical CO2. Temperature had a much greater effect on solubility than pressure. For example, increasing the temperature from 313 K to 523 K at 400 bar increased the mole fraction solubility of benzo[ghi]perylene from 3.3 × 10-7 to 4.55 × 10-4 compared to an increase from 2.9 × 10-6 to 4.55 × 10-4 when the pressure was increased from 100 bar to 450 bar at 523 K. Correlation of the results shows good self-consistency of the data obtained and reasonable agreement with the available published data. Equations are given for the solubilities over the pressure and temperature conditions studied.