title: Effect of addition of silica- and amine functionalized silica-nanoparticles on the microstructure of calcium silicate hydrate (C-S-H) gel.
abstract: In this work we study the influence of adding nano-silica (SiO2, Nyasil™) and aminopropyl (-(CH2)3-NH2,) functionalized silica nanoparticles (Stoga) during the synthesis of calcium-silicate-hydrate (C-S-H gel). Characterization by solid state (29)Si NMR and ATR-FTIR spectroscopy showed that the addition of both particle types increases the average length of the silicate chains in C-S-H gel being this effect slightly more important in the case of Stoga particles. In addition, (13)C NMR and XPS confirmed that the aminopropyl chain remains in the final product cleaved to silicon atoms at the end of the silicate chain of C-S-H gel whereas XRD measurements showed that this result in an increment in the basal distance compared with ordinary CSH. In addition, the dynamics of water within the pores of C-S-H gel was analyzed by broadband dielectric spectroscopy. We observed that water confined in C-S-H formed with the addition of nanoparticles is faster than that in plain C-S-H which can be related to a different porous structure in these materials.
authors: Centro de Fisica de Materiales (CSIC, UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain.
authors: Manuel
authors: M
authors: Monasterio
authors: Tecnalia Research & Innovation, Materials, Sustainable Construction Division, c/Geldo, Edificio 700, Parque Tecnológico de Bizkaia, Derio, Spain.
authors: Juan J
authors: JJ
authors: Gaitero
authors: Tecnalia Research & Innovation, Materials, Sustainable Construction Division, c/Geldo, Edificio 700, Parque Tecnológico de Bizkaia, Derio, Spain; Donostia International Physics Center, 20018 San Sebastián, Spain.
authors: Edurne
authors: E
authors: Erkizia
authors: Institute of Construction Science "Eduardo Torroja", CSIC, Madrid, Spain.
authors: Ana M
authors: AM
authors: Guerrero Bustos
authors: Centro de Fisica de Materiales (CSIC, UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain.
authors: Luis A
authors: LA
authors: Miccio
authors: Tecnalia Research & Innovation, Materials, Sustainable Construction Division, c/Geldo, Edificio 700, Parque Tecnológico de Bizkaia, Derio, Spain.
authors: Jorge S
authors: JS
authors: Dolado
authors: Centro de Fisica de Materiales (CSIC, UPV/EHU), Materials Physics Center (MPC), Paseo Manuel de Lardizabal 5, 20018 San Sebastián, Spain; Donostia International Physics Center, 20018 San Sebastián, Spain.
authors: Silvina
authors: S
authors: Cerveny
keywords: Cement like materials; C–S–H gel; Dielectric properties; NMR; Nanoparticles; Water dynamics