And what you're looking at is a nice, solid nanoparticle at the beginning, before it's been exposed to water. And then after eight, 16 and 24 hours, you can see those nanoparticles hollowing out, releasing lots of useful silicic acid.
Lo que ven es una nanopartícula sólida antes de exponerla al agua, y tras ocho, 16 y 24 horas observarán que esas nanopartículas se van ahuecando y liberando ese ácido silícico tan beneficioso.