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Highly pulverulent silica is one the main components of Vacuum Insulation Panels (VIPs) exhibiting high performance thermal insulation. When they are perfectly dry, pyrogenic silica powders are one of best materials for thermal performance for this application. However, owing to their high affinity for water, vapor adsorption capacity and ageing under various conditions must be considered. The main...
Zeta potentials of silica were measured at different pH. With the increment of pH values, zeta potentials increased accordingly, resulting from the increase of the concentration of the negative charges on the silica surface. With further increment of pH values, however, zeta potentials decreased when pH value reached beyond 10.55. When HCl was added into the system to increase pH, negative charges...
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