Synthesis and grafting of silica aerogels

Marzouk, Soumaya; Rachdi, F.; Fourati, Mohieddine; Bouaziz, Jamel

doi:10.1016/j.colsurfa.2003.11.002

Cited by 23 publications

(6 citation statements)

References 7 publications

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“…For example, chemical modifications by grafting in solution after re-impregnation [96] or in a gaseous atmosphere [97], skeleton coating by chemical vapor infiltration [98], impregnation of the bulk porosity with reactive species (Figure 2.11), embedding in polymers (Figure 2.12), mechanical engineering by milling, cutting, laser micromachining [100], and thermal processing such as sintering [101] can be performed to target specific applications.…”

Section: Synthesis Flexibilitymentioning

confidence: 99%

SiO2 Aerogels

Pierre

Rigacci

2011

Aerogels Handbook

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International audienceThis chapter focuses on one of the most studied aerogel materials, silica aerogels. It aims at presenting a brief overview of the elaboration steps (sol-gel synthesis, aging, and drying), the textural and chemical characteristics (aggregation features, porosity, and surface chemistry), the main physical properties (from thermal, mechanical, acoustical, and optical, to biological, medical, etc.), and a rather broad panel of related potential applications of these fascinating nanostructured materials. It cannot be considered as an exhaustive synopsis but must be used as a simple tool to initiate further bibliographic studies on silica aerogels

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Section: Synthesis Flexibilitymentioning

confidence: 99%

SiO2 Aerogels

Pierre

Rigacci

2011

Aerogels Handbook

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“…by the use of aerosols. The particles obtained in this way have surface area high and wide particle size distribution . Another popular method of silica production is by combustion of silicon tetrachloride at 1200 °C.…”

Section: Introductionmentioning

confidence: 99%

Surface-dependent effect of functional silica fillers on photocuring kinetics of hydrogel materials

Sądej

Andrzejewska

Kurc

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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Two types of silica: precipitated (P, prepared in non-polar media, a new type, submicrometer sized) and fumed (F, nanosized), both unmodified and surface modified are investigated as functional fillers for potential applications in nanocomposites with poly(2-hydroxyethyl methacrylate) matrix. Special attention is paid to the kinetics of composite formation in an in situ photopolymerization process. Silicacontaining formulations polymerize faster; this effect is much stronger for silica P having much larger particle size than silica F. Surface treatment leads to further acceleration of the polymerization in case of silica P but to retardation in case of silica F; the effect of modification of the filler surface on properties of composites is different for each of the silicas. The obtained results are discussed in terms of effects of curvature of silica particles, surface properties, solvation cell, interphase region, viscosity changes, and morphology of the resulting composites.

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“…This signal is more intense in the case of the xerogel incorporating 18C6, probably due to a higher amount of methylene equivalent groups and, so it is in a higher proportion than the DMS17C6 with respect to the initial alkoxysilanes ratio. An additional signal at 0.22 ppm appears in the spectrum of the DMS17C6-xerogel, which could be ascribed to the equivalent methyl groups of the silacrown [41]. In contrast, other signals corresponding to C1' and C2' atoms in DMS17C6, with theoretical values of 62.2 and 74.1 ppm, respectively (calculated with the program ChemBioDraw Ultra 11.0.1), cannot be identified in the spectrum probably due to their low intensity.…”

Section: Resultsmentioning

confidence: 73%