Recently, we have described a successful synthesis route to obtain mesoporous quartz and its high-pressure polymorph coesite by nanocasting at high pressure using periodic mesostructured precursors, such as SBA-16 and FDU-12/carbon composite as starting materials. Periodic mesoporous high-pressure silica polymorphs are of particular interest as they combine transport properties and physical properties such as hardness that potentially enable the industrial use of these materials. In addition, synthesis of mesoporous crystalline silica phases can allow more detailed geology-related studies such as water/mineral interaction, dissolution/crystallization rate and the surface contribution to the associated thermodynamic stability (free energy and enthalpy) of the various polymorphs and their crossover. Here, we present results of synthesis of mesoporous stishovite from cubic large-pore periodic mesoporous silica LP-FDU-12/C composite as precursor with an fcc lattice. We describe the synthesis procedure using multi-anvil apparatus at 9 GPa (about 90,000 atm) and temperature of 500 A degrees C. The synthetic mesoporous stishovite is, then, characterized by wide and small-angle X-ray diffraction, scanning/transmission electron microscopy and gas adsorption. Results show that this new material is characterized by accessible mesopores with wide pore size distribution, surface area of similar to 45 m(2)/g and volume of pores of similar to 0.15 cm(3)/g. Results from gas adsorption indicate that both porosity and permeability are retained at the high pressures of synthesis but with weak periodic order of the pores.

High-pressure synthesis of mesoporous stishovite. Potential applications in mineral physics / Stagno, Vincenzo; Mandal, Manik; Landskron, Kai; Fei, Yingwei. - In: PHYSICS AND CHEMISTRY OF MINERALS. - ISSN 0342-1791. - 42:6(2015), pp. 509-515. [10.1007/s00269-015-0739-8]

High-pressure synthesis of mesoporous stishovite. Potential applications in mineral physics

STAGNO, VINCENZO;
2015

Abstract

Recently, we have described a successful synthesis route to obtain mesoporous quartz and its high-pressure polymorph coesite by nanocasting at high pressure using periodic mesostructured precursors, such as SBA-16 and FDU-12/carbon composite as starting materials. Periodic mesoporous high-pressure silica polymorphs are of particular interest as they combine transport properties and physical properties such as hardness that potentially enable the industrial use of these materials. In addition, synthesis of mesoporous crystalline silica phases can allow more detailed geology-related studies such as water/mineral interaction, dissolution/crystallization rate and the surface contribution to the associated thermodynamic stability (free energy and enthalpy) of the various polymorphs and their crossover. Here, we present results of synthesis of mesoporous stishovite from cubic large-pore periodic mesoporous silica LP-FDU-12/C composite as precursor with an fcc lattice. We describe the synthesis procedure using multi-anvil apparatus at 9 GPa (about 90,000 atm) and temperature of 500 A degrees C. The synthetic mesoporous stishovite is, then, characterized by wide and small-angle X-ray diffraction, scanning/transmission electron microscopy and gas adsorption. Results show that this new material is characterized by accessible mesopores with wide pore size distribution, surface area of similar to 45 m(2)/g and volume of pores of similar to 0.15 cm(3)/g. Results from gas adsorption indicate that both porosity and permeability are retained at the high pressures of synthesis but with weak periodic order of the pores.
2015
Carbon; FDU-12; mesoporous materials; pore size distribution; SiO<inf>2</inf> polymorphs; stishovite; geochemistry and petrology; materials science (all)
01 Pubblicazione su rivista::01a Articolo in rivista
High-pressure synthesis of mesoporous stishovite. Potential applications in mineral physics / Stagno, Vincenzo; Mandal, Manik; Landskron, Kai; Fei, Yingwei. - In: PHYSICS AND CHEMISTRY OF MINERALS. - ISSN 0342-1791. - 42:6(2015), pp. 509-515. [10.1007/s00269-015-0739-8]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/856825
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