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Authors
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Branda, F. ; Bifulco, A. ; Jehnichen, D. ; Parida, D. ; Pauer, R. ; Passaro, J. ; Gaan, S. ; Pospiech, D. ; Durante, M.
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Title
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Structure and bottom-up formation mechanism of multisheet silica-based nanoparticles formed in an epoxy matrix through an in situ process
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Date
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22.11.2021
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Number
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59583
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Abstract
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Organic/inorganic hybrid composite materials with the dispersed phases in sizes down to a few tens of nanometers raised very great interest. In this paper, it is shown that silica/epoxy nanocomposites with a silica content of 6 wt % may be obtained with an “in situ” sol–gel procedure starting from two precursors: tetraethyl orthosilicate (TEOS) and 3-aminopropyl-triethoxysilane (APTES). APTES also played the role of a coupling agent. The use of advanced techniques (bright-field high-resolution transmission electron microscopy, HRTEM, and combined small- and wide-angle X-ray scattering (SAXS/WAXS) performed by means of a multirange device Ganesha 300 XL+) allowed us to evidence a multisheet structure of the nanoparticles instead of the gel one typically obtained through a sol–gel route. A mechanism combining in a new manner well-assessed knowledge regarding sol–gel chemistry, emulsion formation, and Ostwald ripening allowed us to give an explanation for the formation of the observed lamellar nanoparticles.
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Publisher
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Langmuir
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Wikidata
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Q109672287
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Citation
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Langmuir 37 (2021) 8886-8893
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DOI
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https://doi.org/10.1021/ACS.LANGMUIR.1C01363
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