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PDMS-SiO2 hybrid materials - A new insight into the role of Ti and Zr as additives
- Source :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
- Publication Year :
- 2015
- Publisher :
- ELSEVIER SCI LTD, 2015.
-
Abstract
- The last two decades have seen a remarkable growth in the design of new hybrid materials applied to different areas, from photonics to biomaterials, together with new coating materials with self-cleaning features. Among the various systems studied, the PDMS-SiO2 system remains as a good basis for further developments by adding other compounds such as transition metals. In this work, a detailed study of the influence of titanium or zirconium in the chemical structure and final microstructure of such hybrids was made. It was concluded that, due to the lower reactivity of the titanium alkoxide during the sol-gel preparation process, titanium is preferably located on the surface of secondary particles of silica, unlike the zirconium, which being more reactive, positions on the surface of the primary particles. This difference leads to xerogels with dissimilar characteristics and morphologies. (C) 2015 Elsevier Ltd. All rights reserved.
- Subjects :
- STRUCTURAL-CHARACTERIZATION
SOL-GEL CHEMISTRY
Materials science
Polymers and Plastics
STATE SI-29 NMR
chemistry.chemical_element
chemistry.chemical_compound
Transition metal
Materials Chemistry
Reactivity (chemistry)
POLYSILOXANE NETWORKS
NUCLEAR-MAGNETIC-RESONANCE
Sol-gel
Zirconium
Organic Chemistry
SMALL-ANGLE SCATTERING
Microstructure
X-RAY-SCATTERING
FT-IR
chemistry
Chemical engineering
Alkoxide
MAS NMR
SILOXANE-OXIDE MATERIALS
Hybrid material
Titanium
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
- Accession number :
- edsair.doi.dedup.....25313e6ea3cd5b4d1d8b9f2a7ff90d69