• Categoría: Artículo
  • Título: Gel point determination of TEOS-based polymeric materials with application on conservation of cultural heritage buildings
  • Autor (es): R. Angulo-Olais, Juan F. Illescas, J. Aguilar-Pliego, C. A. Vargas, C. Haro-Pérez
  • Revista: Advances in Condensed Matter Physics
  • Volumen: 2018
  • Páginas: 5784352
  • Formato: Enlace
  • Subido por: Catalina Ester

Gel point determination of TEOS-based polymeric materials with application on conservation of cultural heritage buildings

R. Angulo-Olais, Juan F. Illescas, J. Aguilar-Pliego, C. A. Vargas, C. Haro-Pérez

Here we presentmeasurements on the gel time of inorganic-organic materials used for stone preservation bymeans of rheology and
dynamic light scattering. Our hybrid material is composed of tetraethyl orthosilicate (TEOS) and polydimethylsiloxane (PDMS)
using a nonionic surfactant (n-octylamine) as a template. Moreover, zinc oxide (ZnO) nanoparticles are dispersed in the medium
with the aim of obtaining a nanocomposite with potential biocide properties. In our case, we use the ZnO particles as tracers
to infer from their scattered intensity mechanical information of the suspending medium. We have found that dynamic light
scattering experiments provide similar information on the gelling time, about 30 hours, to that obtained from rotational rheology
and oscillatory rheology. This result confirms the validity of light scattering, which is a noninvasive technique, to characterize
mechanical properties of time evolving hybrid materials through nonperturbative and well-controlled experiments.