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Comparative study of texture and rheological properties of AgI-SiO2 hybrid powders with different pore structure

  • Original Paper: Sol-gel and hybrid materials with surface modification for applications
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Abstract

AgI-SiO2 hybrid powders (HPs) based on SBA-15, MCM-41, and MCM-48 have been prepared by template co-condensation of silica and silver iodide under hydrothermal conditions. The effect of the [Ag]/[Si] ratio and the type of silica matrix on the textural, structural, morphological, and rheological properties of the HPs has been studied. The formation of the target phase of iodargyrite (β-AgI) is dependent both on the ratio of the main components [Ag]/[Si] and on the pore arrangement in the silica matrix, as detected by XRD. The small-angle XRD and low-temperature nitrogen adsorption data have shown the textural and structural properties of AgI-SiO2 hybrid powders to be similar to the porous structure of the initial silica matrices—SBA-15, MCM-41, or MCM-48. A uniform distribution of silver iodide in all silica matrices, SBA-15, MCM-41 and MCM-48, has been demonstrated by energy dispersive microanalysis (EDAX). For AgI-SiO2 powders with various types of pore arrangement, a high fluidity degree has been demonstrated using the data on the natural angle of repose. It has been shown that MCM-48 based β-AgI-SiO2 powders are characterized by the smallest crystallite sizes (~6 nm), and average size of particles (50 nm) and average size of particle aggregates (13 μm), the highest specific surface area (up to 860 m2/g) and the best fluidity.

Graphical Abstract

Highlights

  • The formation of the target β-AgI phase, iodargyrite, in AgI-SiO2 hybrid powders (HP) depends both on the component [Ag]/[Si] ratio and on the pore arrangement type of the silica matrix.

  • Crystal phase, corresponding to iodargyrite, was detected in HPs samples prepared using the [Ag]/[Si] ratios within the range from 0.04 to 0.08.

  • In AgI-SiO2 powders prepared by hydrothermal template synthesis via а co-condensation route, the ordered pore arrangement was found to be similar to that of the initial silica matrices—SBA-15, MCM-41 or MCM-48.

  • The smallest crystallites (~6 nm), average size of particles (50 nm) and average size of particle aggregates (13 μm), the highest specific surface area (up to 860 m2/g), and the best fluidity was found in the case of β-AgI-SiO2 powders based on the MCM-48 matrix.

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Funding

The reported study was supported by the Government of Perm Krai, research project No. С-26/542.

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Authors and Affiliations

  1. “Institute of Technical Chemistry of UB RAS”—affiliation of Perm Federal Research Centre of Ural Branch of Russian Academy of Sciences, Academician Korolev st., 3, Perm, 6140133, Russia

    A. S. Averkina, N. B. Kondrashova, E. V. Saenko, A. Sh. Shamsutdinov & V. A. Valtsifer

  2. University of Ljubljana, Kongresni trg 12, 1000, Ljubljana, Slovenia

    D. Stopar

Authors
  1. A. S. Averkina
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  2. N. B. Kondrashova
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  3. E. V. Saenko
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  4. A. Sh. Shamsutdinov
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  5. V. A. Valtsifer
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  6. D. Stopar
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Correspondence to A. S. Averkina.

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Averkina, A.S., Kondrashova, N.B., Saenko, E.V. et al. Comparative study of texture and rheological properties of AgI-SiO2 hybrid powders with different pore structure. J Sol-Gel Sci Technol 108, 339–351 (2023). https://doi.org/10.1007/s10971-023-06086-x

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  • DOI: https://doi.org/10.1007/s10971-023-06086-x

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