Octadecyl-modified silicas obtained by non-hydrolytic condensation of a C18-hybrid silica sol on a silica surface

Introduction of phosphorous into hybrid silica sol–gel coatings on Ti6Al4V gives materials demonstrating higher levels of intermolecular condensation and fibrinogen uptake as well as improved in vitro biocompatibility and corrosion protection.

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Hybrid silica sol–gel coatings on Austempered Ductile Iron (ADI)

Materials Letters ◽

10.1016/j.matlet.2005.03.001 ◽

2005 ◽

Vol 59 (17) ◽

pp. 2219-2222 ◽

Cited By ~ 21

Author(s):

Andrés Pepe ◽

Pablo Galliano ◽

Silvia Ceré ◽

M. Aparicio ◽

A. Durán

Keyword(s):

Ductile Iron ◽

Sol Gel ◽

Silica Sol ◽

Austempered Ductile Iron ◽

Hybrid Silica

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Effects of TiO2/SiO2 Reinforced Nanoparticles on the Mechanical Properties of Green Hybrid Coating

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.47.56 ◽

2015 ◽

Vol 47 ◽

pp. 56-66 ◽

Cited By ~ 3

Author(s):

Mohammed Gobara

Keyword(s):

Mechanical Properties ◽

Sol Gel ◽

Hardness Test ◽

Silica Sol ◽

X Ray Diffraction ◽

Properties Of Coatings ◽

X Ray ◽

Hybrid Silica ◽

Transmission Electron ◽

Adhesion Performance

Titanium and silica oxides nanoparticles were introduced into hybrid silica sol–gel/epoxy coating to enhance the mechanical properties of coatings. Titanium dioxide (TiO2) and silica oxide (SiO2) were chemically synthesised before adding to the prepared silica sol gel coating. X-ray diffraction (XRD), Energy-dispersive x-ray analysis (EDX) and Transmission Electron microscope (TEM) were used to characterize the prepared nanoparticles. The coating was then applied to 3003 aluminium alloy (AA3003) surface. The adhesion performance of different sol gel coating compositions was investigated using shear test to define the influence of nanoparticles on adhesive strength of the coating. The Rockwell C hardness test was used to study the micro-hardness of different compositions of sol gel coating. Also, contact angel was used to investigate the hydrophobicity of the coatings. The results showed that there was a significant improvement of the adhesion performance of hybrid silica sol gel coating due to addition of TiO2 and the hydrophobicity of sol gel coating was increased due to addition of SiO2 nanoparticles.

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Hybrid silica / polymer nanoparticles through emulsion polymerization

MRS Proceedings ◽

10.1557/proc-628-cc3.5 ◽

2000 ◽

Vol 628 ◽

Cited By ~ 6

Author(s):

Elodie Bourgeat-Lami ◽

Jose-Luiz Luna-Xavier ◽

Alain Guyot

Keyword(s):

Emulsion Polymerization ◽

Silica Surface ◽

Monomer Concentration ◽

Polymer Nanoparticles ◽

Polymer Encapsulation ◽

Propyl Methacrylate ◽

Hybrid Silica ◽

Transmission Electron ◽

Methacrylate Monomers ◽

Positively Charged

ABSTRACTPolymer encapsulation of inorganic silica nanoparticles was performed through emulsion polymerization of styrene and methyl methacrylate monomers. Two different approaches are described. In a first one, the hydrophilic silica was modified by reacting the coupling agent, 3-trimethoxysilyl propyl methacrylate, which was involved further in propagation reactions. In a second approach, we used the 2–2'- azobis (2-amidinopropane) dihydrochloride cationic initiator to promote interactions of the positively charged growing polymer with the negatively charged silica surface. We demonstrate, using transmission electron microscopy, that the silica beads are successfully encapsulated by the two techniques giving silica/polymer nanoparticles with different morphologies. The influence of some parameters, such as the nature of the surfactant and the monomer concentration, on the efficiency of the encapsulation reaction and the morphology of the encapsulated products are reported.

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