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New route for producing crack-free xerogels: Obtaining uniform pore size

“…The most popular example of DCCA is formamide. This popular strategy has been applied in recent papers [3][4][5]. Another approach is suppressing the liquid-vapor interface by gel drying at supercritical conditions [6].…”

Electrocatalytic oxidation of nitrite on a carbon paste electrode modified with Co(II) porphyrin adsorbed on SiO2/SnO2/Phosphate prepared by the sol–gel method

“…The methods of preparation have been in the form of a monolithic bulk obtained by the sol-gel processing method [16], as a highly dispersed oxide on a porous silica surface from a grafting process [17,18], as thin films [19][20][21] or as a membrane prepared by the sol-gel method [22]. Even though the oxide presents good electrical conductivity, due to its low mechanical resistance, SnO 2 is usually used dispersed a thin layer or film, obtained by a grafting reaction [23,24] on porous matrix surfaces possessing structural rigidity.…”

Producing Crack-Free Colloid−Polymer Hybrid Gels by Tailoring Porosity

“…It is obvious that any changes made to these parameters that tend to minimize the capillary pressure should increase the probability of monolithic gel formation. One alternative is to add drying control chemical additives (DCCA), the low surface tension of which acts to reduce capillary pressure. , Another efficient way of neutralizing the undesired effects of surface tension is to suppress the liquid−vapor interface. This is achieved by treating the gel in an autoclave under supercritical conditions for the solvent, taking care that the path of the thermal treatment does not cross the equilibrium curve .…”