Facile mechanosynthesis of amorphous zeolitic imidazolate frameworks.
Journal of the American Chemical Society 133:37 (2011) 14546-14549
Abstract:
A fast and efficient mechanosynthesis (ball-milling) method of preparing amorphous zeolitic imidazolate frameworks (ZIFs) from different starting materials is discussed. Using X-ray total scattering, N(2) sorption analysis, and gas pycnometry, these frameworks are indistinguishable from one another and from temperature-amorphized ZIFs. Gas sorption analysis also confirms that they are nonporous once formed, in contrast to activated ZIF-4, which displays interesting gate-opening behavior. Nanoparticles of a prototypical nanoporous substituted ZIF, ZIF-8, were also prepared and shown to undergo amorphization.Identification of the elusive hydronium ion exchanging roles with a proton in an enzyme at lower pH values.
Angewandte Chemie (International ed. in English) 50:33 (2011) 7520-7523
Crystal structure determinations of Zr Rich-PbZr1-x Ti x O3
Ferroelectrics 414:1 (2011) 147-154
Abstract:
TOF experiments were carried out at room temperature and high temperature for Zr rich PbZr1-xTixO3 powders. The best R-factors were obtained with a mixture of R3c and Cm phases. The composition of the Cm phase monotonically increases towards the MPB. At high temperature in the cubic phase, the ADPs for the Pb atom become smaller when Pb displacements along either >110Structural investigation of LN/LT1 superlattice thin films by field effect scanning transmission electron microscopy equipped with electron disspersive x-ray spectroscopy
Institute of Electrical and Electronics Engineers (IEEE) (2011) 1-4
Reversible pressure-induced amorphization of a zeolitic imidazolate framework (ZIF-4).
Chemical communications (Cambridge, England) 47:28 (2011) 7983-7985