ESEEM of industrial quartz powders: insights into crystal chemistry of Al defects |
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| Authors: | Maurizio?Romanelli Email author" target="_blank">Francesco?Di BenedettoEmail author Laura?Bartali Massimo?Innocenti Gabriele?Fornaciai Giordano?Montegrossi Luca?A?Pardi Alfonso?Zoleo Fabio?Capacci |
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| Institution: | 1.Department of Chemistry,Università di Firenze,Sesto Fiorentino,Italy;2.Institute for the Chemistry of the Organo-Metallic Compounds (CNR-ICCOM),Sesto Fiorentino,Italy;3.Institute for the Geosciences and Georesources (CNR-IGG),Florence,Italy;4.Institute for the Physico-Chemical Processes (CNR-IPCF),Pisa,Italy;5.Department of Chemical Sciences,Università di Padova,Padua,Italy;6.Local Health Agency of Florence,Florence,Italy |
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| Abstract: | A set of raw industrial materials, that is, pure quartz and quartz-rich mixtures, were investigated through electron paramagnetic
resonance and electron spin echo-envelope modulation spectroscopies, with the aim of evaluating the effective role played
by defect centres and of assessing whether they can be used to monitor changes in the physical properties of quartz powders
with reference to their health effects. The obtained results point to two interactions of the Al defect centres with H+, hosted in sites within the channels parallel and perpendicular to the c axis of quartz, respectively. These two Al/H+ (hAl) centres exhibit a weak chemical bond, and their relative amounts appear to be modified/controlled by the thermo-mechanical
processes underwent by powders. Indeed, a mechanically promoted inter-conversion between the two kinds of site is suggested.
As a consequence, the hAl centres are effective in monitoring even modest activations of powders, through thermal or mechanical processes, and they
are also supposed to play a specific, relevant role in quartz reactivity during the considered industrial processes. |
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