Stabilization of silica sols derived from an inexpensive, fully inorganic precursor and their use

Puputti, Janne; Nilsen, Elin; Einarsrud, Mari‐Ann; Bell, Jean Le; Perander, Michael; Lindén, Mika

doi:10.1016/j.jnoncrysol.2004.06.016

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…The composition of the solid fiber is depicted in Table and compared with the previous work, which has utilized the same mineral precursor . As can be seen, the values are in good agreement with previous research. , Based on the composition of the material, a mean value for the molar mass of the mineral fiber can be calculated, giving 60.25 g/mol.…”

Section: Resultssupporting

confidence: 80%

“…11 As can be seen, the values are in good agreement with previous research. 10,11 Based on the composition of the material, a mean value for the molar mass of the mineral fiber can be calculated, giving 60.25 g/mol.…”

Section: Dissolution Experiments 311 Icp-ms Analysismentioning

confidence: 99%

“…The effect of the acid concentration on the dissolution rate was studied in a limited number of experiments, with 4.6 wt % mineral material, and it was concluded that pH and the dissolution time of the fiber depend on the concentration of the solution. The stability of the obtained silica sol was increased by Puputti et al 10 through introducing ethanol in the aqueous solution. An optimum of around 35% ethanol in the initial solution was observed to result in a significant increase of the gelation time.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution of Mineral Fiber in a Formic Acid Solution: Kinetics, Modeling, and Gelation of the Resulting Sol

Grénman

Ramirez

Eränen

et al. 2008

Ind. Eng. Chem. Res.

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A new inorganic adhesive based on sol-gel technology has been developed recently. The sol is produced by dissolving a mineral material, with silica as the major compound, in formic acid. In this work, the kinetics and mechanisms of the solid-liquid reaction of the amorphous mineral raw material with formic acid were studied. The effect of different variables, such as temperature, acid concentration, and fiber load, were examined. Moreover, the influence of various parameters on the gelation rate of the resulting sol was investigated at different temperatures. The dissolution of the mineral fiber was found to be strongly dependent on the temperature and fiber load, but moderately dependent on the acid concentration as the pH of the solution was buffered by the formic acid. The kinetic model developed for the dissolution process accurately describes the experimental results and can thus be used for design and optimization of the process. The gelation studies showed that the temperature and the amount dissolved are the variables most affecting the gelation time. The knowledge of the gelation kinetics is important when striving for a high dry solid content in the sol, while still avoiding premature gelation in production, transport, and storage.

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Section: Resultssupporting

confidence: 80%