Abstract
The growth mechanism of a whisker of stigmasterol particles deposited by rapid expansion from supercritical CO 2 solutions has been investigated by scanning electron microscope. Amorphous fine particles were found to be under relatively low pre-expansion pressures while whisker-like crystals were observed under relatively high pre-expansion pressures. The turning point was about 13 MPa at 373 K. It was found that the secondary products grew on a screen in the expansion jet after deposition of primary particles of about 10-nm diameter. The morphology of secondary products was found to strongly depend on the surface condition of the primary particle. Because of the temperature decrease caused by the rapid expansion, the pre-expansion pressure plays an important role in determining the thermal roughening degree on the surface of primary particles, and consequently the morphology of the secondary products.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
