2006
DOI: 10.1016/j.jnoncrysol.2005.11.024
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Abstract: Resorcinol-formaldehyde gels were produced at 50, 70 and 90°C and with three different R/C ratios (500, 1000 and 2000). The effect of these variables combined with that of aging time was studied in order to optimize the synthesis conditions. The convective air-drying process was used, and the drying duration was studied with regard to the synthesis conditions. The aging time has no effect on the pore texture after 24 h at 90°C or 48 h at 70°C, whatever the R/C value. The synthesis-aging step can be shortened b… Show more

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Cited by 107 publications
(105 citation statements)
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“…The samples prepared at 90 ºC and 95 ºC break this trend, likely due to the sudden heating of the aqueous solution at temperatures close to the boiling point of water, as mentioned above [30]. The organic gels presented a slightly acidic nature as seen in the trend of the values of the pH PZC (Table 2).…”
Section: Effect Of Gelation/aging Time and Temperaturementioning
confidence: 77%
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“…The samples prepared at 90 ºC and 95 ºC break this trend, likely due to the sudden heating of the aqueous solution at temperatures close to the boiling point of water, as mentioned above [30]. The organic gels presented a slightly acidic nature as seen in the trend of the values of the pH PZC (Table 2).…”
Section: Effect Of Gelation/aging Time and Temperaturementioning
confidence: 77%
“…On the other hand, the slight deterioration of the porosity above 85ºC could be attributed to several factors such as the sudden heating of the solution (see experimental section), the fast evaporation rate of the aqueous medium at 90 and 95ºC, and the changes in the dissociation constants of water and resorcinol with temperature (hence modifying the pH). The latter facts could promote a phase demixing that would affect the development of porosity [30].…”
Section: Effect Of Gelation/aging Time and Temperaturementioning
confidence: 99%
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“…Some of us have shown recently that it is possible to produce porous resorcinol-formaldehyde xerogels by using atmospheric convective drying to remove the solvent, without any preliminary treatment [17]. Indeed, when synthesis conditions are adequate, the mechanical strength of the gel network is high enough to withstand capillary pressures, avoiding the collapse of the structure [18].…”
Section: Introductionmentioning
confidence: 99%
“…Since the carbonate concentration controls the gel texture and its shrinkage behavior [15], two R/C ratios (300, and 500) were chosen to study the influence of the solid displacement. Indeed, the pore texture of the pristine RF hydrogels can be modified by changing the pH, or the R/C ratio, of the precursors solution.…”
Section: Sample Preparationmentioning
confidence: 99%