Surface-modified silica nanoparticles are available as concentrates in epoxy resins in
industrial quantities for nearly 20 years. Meanwhile, they are used in many epoxy resin formulations
for various applications like fiber-reinforced composites, adhesives or electronic components; even in
space vehicles like satellites. Some of the drawbacks of “classic” epoxy toughening using elastomers
as a second phase, like lower modulus or a loss in strength can be compensated by using nanosilica
together with such tougheners. Apparently, there exists a synergy as toughness and fatigue
performance are increased significantly. This work intends to provide an overview regarding the
possibilities of nanotoughening with silica, the industrial applications of such epoxy resin formulations
and the most recent research results.