Abstract
During silicalite-1 nucleation and growth from clear solutions the nanoparticle specific surface area, defined as the ratio of external surface of the nanoparticles to the nanoparticle mass, decreases more than two orders of magnitude. The effect of such changes in solution properties such as pH, TPA + activity and nanoparticle ζ-potential have been investigated using surface complexation modeling. The observed changes are explained by using the reactions taking place on the surface of silicalite-1 nanocrystals, namely the deprotonation of the surface silanol groups, the TPA + specific adsorption on surface silanol sites, and the TPA + adsorption on the pore openings exposed on the silicalite-1 surface. Simulations showed that both pH and TPA + activity are expected to increase during nucleation and growth. The rise in pH is attributed to the decrease of the surface silanol concentration, while the increase of TPA + activity can be attributed to the release of TPA + cations adsorbed on the silicalite-1 pores exposed to the surface. The effect of composition on the magnitude of such changes is also discussed and compared with experimental results. Finally, the effect of composition on silicalite-1 nucleation and growth is discussed based on the calculated values of ζ-potential.
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.
