I would feel a lot more comfortable with these spheres being used in construction if they were 1000 larger in diameter. The size cited is 50nm to 100nm, roughly

I would feel a lot more comfortable with these spheres being used in construction if they were 1000 larger in diameter. The size cited is 50nm to 100nm, roughly the same size as another non-reactive compound that is believed to have real risks associated with it, titanium-dioxide. See https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873219/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873219/