TY - JOUR
T1 - Influence of core/shell TiO2@SiO2 nanoparticles on cement hydration
AU - Sun, Jinfeng
AU - Xu, Kai
AU - Shi, Chaoqi
AU - Ma, Jian
AU - Li, Weifeng
AU - Shen, Xiaodong
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/12/15
Y1 - 2017/12/15
N2 - TiO2@SiO2 nanoparticles with a core/shell structure widely used in photocatalytic fields were used in this paper to improve the hydration properties of the Portland cement. To this end, the core/shell TiO2@SiO2 nanoparticles were synthesized first and then characterized by a series of techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR) and X-ray photoelectron spectra (XPS). Second, the influence of the core/shell TiO2@SiO2 nanoparticles on cement hydration was investigated and compared with nano-TiO2 through isothermal calorimetry, XRD, thermo gravimetric/derivative thermo-gravimetric (TG/DTG) and mercury intrusion porosimetry (MIP) analyses. The results showed that an amorphous SiO2 layer can be deposited uniformly on nano-TiO2 particles by forming new Si[sbnd]O[sbnd]Ti chemical bonds at the interface between the SiO2 coating layer and nano-TiO2 particle surface. This uniform layer was conducive to decrease the aggregation of nano-TiO2 effectively. Compared with nano-TiO2, the core/shell TiO2@SiO2 nanoparticles exhibited better hydration properties in terms of accelerated cement hydration, higher degree of hydration and lower porosity, even though both particles modified cement hydration.
AB - TiO2@SiO2 nanoparticles with a core/shell structure widely used in photocatalytic fields were used in this paper to improve the hydration properties of the Portland cement. To this end, the core/shell TiO2@SiO2 nanoparticles were synthesized first and then characterized by a series of techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR) and X-ray photoelectron spectra (XPS). Second, the influence of the core/shell TiO2@SiO2 nanoparticles on cement hydration was investigated and compared with nano-TiO2 through isothermal calorimetry, XRD, thermo gravimetric/derivative thermo-gravimetric (TG/DTG) and mercury intrusion porosimetry (MIP) analyses. The results showed that an amorphous SiO2 layer can be deposited uniformly on nano-TiO2 particles by forming new Si[sbnd]O[sbnd]Ti chemical bonds at the interface between the SiO2 coating layer and nano-TiO2 particle surface. This uniform layer was conducive to decrease the aggregation of nano-TiO2 effectively. Compared with nano-TiO2, the core/shell TiO2@SiO2 nanoparticles exhibited better hydration properties in terms of accelerated cement hydration, higher degree of hydration and lower porosity, even though both particles modified cement hydration.
KW - Cement
KW - Core/shell TiO@SiO nanoparticles
KW - Hydration
KW - Nano-TiO
UR - http://www.scopus.com/inward/record.url?scp=85028743135&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2017.08.124
DO - 10.1016/j.conbuildmat.2017.08.124
M3 - 文章
AN - SCOPUS:85028743135
SN - 0950-0618
VL - 156
SP - 114
EP - 122
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -