Resistance to salt crystallization provided by a new surfactantsynthesized ormosil applied in monumental stone restoration

M. J. Mosquera & D. M. De Los Santos
Most commercial stone restoration products contain tetraethoxysilane (TEOS). A well-known drawbackof these materials is their tendency to form gels susceptible to cracking, which is generated by the highcapillary pressures supported during drying. We have synthesized a new nanomaterial by adding ahydroxyl-terminated polydimethylsiloxane (PDMS) to TEOS in the presence of the surfactant, noctylamine.The surfactant acts to direct the gel network pore structure; the coarsening of the gel networkthen reduces the capillary pressure responsible for cracking. In...