ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 51, (1) 24 - 29 (2007)


CHEMICALLY ACTIVATED KAOLINITES AFTER DE-INTERCALATION OF FORMAMIDE
 
Valášková Marta, Sihma Martynková Gražyna, Matějka Vlastimil, Kratošová Gabriela
 
Institute of Materials Chemistry, VŠB-Technical University of Ostrava, 17. listopadu 15/2172

Keywords: Powders-chemical preparation, De-intercalation, X-ray diffraction, Kaolinite, Structural application
 

Five well and poor ordered kaolinites were studied to explore structural changes of kaolinite/formamide intercalates and deintercalates. These materials were evaluated using the X-ray powder diffraction (XRPD) supplement with scanning electron microscope (SEM), measurement of specific surface area (SSA) and particle size distribution (PSD). The XRPD of de-intercalated kaolinites exhibit: (1) diffractions of 7 A kaolinite, some remaining 10 A kaolinite/formamide complex and an additional 8.4 A phase, (2) lower one-layer thickness of de-intercalated 7 A kaolinite than before formamide treatment, (3) changes in the (02, 11) diffraction band indicating structural disorder in the a, b plane. The chemical activation of kaolinites using formamide creates kaolinites with smaller and more homogenous particles and higher SSA than were observed in the original ones.


PDF (1.0 MB)
 
Licence Creative Commons © 2015 - 2024
Institute of Rock Structure and Mechanics of the CAS & University of Chemistry and Technology, Prague
Webmaster | Journal Contact