Stabilizing decontamination foam using surface-modified silica nanoparticles containing chemical reagent: foam stability, structures, and dispersion properties
In-Ho Yoon, Suk Bon Yoon, Youngho Sihn, Mansoo Choi, Chong‐Hun Jung, Wang‐Kyu Choi
Abstract
under decontamination conditions. The bubble structure analysis showed that this decontamination foam has a bubble count that is approximately 5-8 times higher than the foams containing NPs modified with the other functional groups, which indicates that the decontamination foam with amine-modified silica NPs has the best foam structure of the three investigated foams. The well-dispersed and smaller amine-modified silica NPs enhance the foam stability by providing a barrier between the gas bubbles and delaying their coalescence. In contrast, the thiol- and propyl-modified silica NPs form aggregates with large diameters that reduce the maximum capillary pressure of coalescence and hence decrease the foam stability.