Sol–gel chemistry can be performed in minutes instead of hours in a supercritical fluid, a process that has now been monitored in situ by a combination of small- and wide-angle X-ray scattering (SAXS and WAXS) with high-energy synchrotron radiation. The setup used to monitor the growth of TiO2 nanoparticles, seeded by polypropylene fibers, in supercritical CO2 is shown schematically in the picture.
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Jensen et al. (2007) studied this question.
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