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21.08.2018 | Original Paper: Sol-gel and hybrid materials for energy, environment and building applications | Ausgabe 1/2019 Open Access

Journal of Sol-Gel Science and Technology 1/2019

From sol–gel prepared porous silica to monolithic porous Mg2Si/MgO composite materials

Zeitschrift:
Journal of Sol-Gel Science and Technology > Ausgabe 1/2019
Autoren:
N. Hayati-Roodbari, R. J. F. Berger, J. Bernardi, S. Kinge, N. Hüsing, M. S. Elsaesser
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s10971-018-4778-8) contains supplementary material, which is available to authorized users.

Abstract

Mg2Si is apart from its conductivity properties expected to be a promising candidate for thermoelectric applications due to its low toxicity, low costs, and the high abundance of its precursor chemicals. Through the addition of a homogeneous distribution of nanoparticles (e.g. MgO) and by reducing the size of Mg2Si to the nanometer regime, it is possible to decrease the thermal conductivity by increasing phonon-interface scattering and, as a result, improve the thermoelectric properties. However, classical approaches do not allow for the synthesis of nanocomposites from Mg2Si and MgO. In this work, a straightforward route is presented towards homogeneously mixed Mg2Si/MgO via a two-step magnesiothermic reduction process starting from sol–gel derived hierarchically organized porous silica. Monolithic materials composed of Mg2Si and MgO in variable molar ratios are built up from a macroporous network of Mg2Si with homogeneously distributed MgO particles exhibiting a crystallite size in the range of 24–37 nm.

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