COLL 460 |
| Svetlana Mintova, Department of Chemistry, Department of Chemistry, University of Munich (LMU), Butenandtstr. 11, Munich, 81377, Germany |
| The development of the nanotechnologies and their requirements for synthesizing nanoscale multi-functional materials put new fascinating goals to the modern solid state chemistry of colloidal systems. Structural control on the nanometric scale is one of the most challenging tasks of modern solid state and material science. The ambitions of bottom-up chemistry approaches for making small zeolite nanoparticles put a limitation to the application of the conventional diffraction analysis. Non-destructive identification and structural control of nanosized zeolite particles stabilized in water using the Raman and/or 13C NMR spectral features of the organic template molecules encapsulated in the zeolite skeleton will be reported. Complimentary in-situ dynamic light scattering in back scattering mode, high-resolution electron microscopy and X-ray diffraction using synchrotron radiation are used to follow the formation and growth of crystal nuclei of colloidal zeolites with BEA and MFI type structures from colloidal precursor solutions. The resulted nanosized zeolite crystals have monomodal particle size distribution and mean diameter in the range of 10-60 nm. The nucleation and crystal growth mechanism of these molecular sieves will be discussed.
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Ipatieff Award Symposium Honoring Raul Lobo
2:00 PM-4:30 PM, Wednesday, March 31, 2004 Marriott -- Grand Ballroom K, Oral
Division of Colloid and Surface Chemistry |