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Chemically modified mesoporous silica nanoparticles (MSNs) are of interest due to their chemical and thermal stability with adjustable morphology and porosity; therefore, it was aimed to develop and compare the MCM-41 MSNs functionalised with imidazole groups (MCM-41-Im) to unmodified (MCM-41-OH) and primary amine functionalised (MCM-41-NH2) MSNs for experimental gene delivery. The results show efficient...
With the use of nano-sized silica particles as fillers, the rheological property of the underfill composites is greatly deteriorated, due to the excessive surface energy of the nano-sized fillers and their poor interfacial compatibility with the underfill matrix. Since interface property is one of the dominant factors for determining the properties of composites, in this study, four kinds of silica...
We report on volume holographic recording in photopolymerizble nanocomposite materials using inorganic SiO2 nanoparticles dispersed in thiol-ene monomers capable of step-growth photopolymerization with various stoichiometric thiol-ene ratios. It is shown that while the refractive index modulation is maximized at the stoichiometric composition, polymerization shrinkage decreases with increasing the...
Polyimides (PI) are widely used in microelectronic industries because of their outstanding characteristics such as good mechanical, thermal and dielectric properties. In this paper, a novel PI/SiO2-Al2O3 co-doped composite film was prepared. The inorganic phases of SiO2 were added to PAA solution by sol-gel method with TEOS as precursor, while the Al2O3 phase was added as particles by ultrasonic-mechanical...
Electron paramagnetic resonance (EPR) investigations were carried out on hybrid Core-Shell nanomaterials associating silicon carbide nanoparticles and conducting polyaniline. The performed experiments compare the paramagnetic centres, the electronic transport features and the interface effects in two classes of materials, bare polymers and core-shell nanocomposites. By EPR, large doping rates were...
It has been shown that in many cases, the addition of nanoscale metal oxide fillers to polymers leads to an improvement in dielectric breakdown strength at room temperature. However, in some cases electrical insulation is exposed to elevated temperatures. A thermally stable polymer material, such as polyamideimide (PAI), is desired for these applications. For this reason, breakdown strength measured...
In this paper we demonstrate an order-of-magnitude suppression of polymerization shrinkage of volume holograms recorded in nanoparticle-polymer composites by green light initiated thiol-ene photopolymerization, as compared to our previously reported nanoparticle-polymer composites with multifunctional (meth)acrylate monomers.
Polymer coatings were doped with low quantity, below 1.5% by weight, of metal and non-metal nanoparticles. The electrical properties, i.e. antistatic properties, volume resistance and temperature characteristics of dissipation factor tan??, were investigated. Antistatic properties were examined by charge decay measurements after corona charging, using JCI 155 apparatus. The results showed that the...
It is found that the blending of inorganic materials and organic materials are usually thermodynamically immiscible with each other. The compatibility between the two blending materials can be enhanced by adding a component which is miscible with both parent materials. Therefore, the as-synthesized silicon dioxide grated by L-lactic acid (OLLA-g-SiO2) was used as a compatibilizer to enhance the compatibility...
In this paper, nano-silica with and without surface modification was added into linear low density polyethylene (LLDPE) to prepare LLDPE/silica or LLDPE/Aluminun trihydrate (ATH)/silica composites. Effects of surface modification of nano-silica on the dispersibility of silica in LLDPE and combustion behaviors of composites were investigated by Transmission electron microscopy (TEM) and cone calorimeter...
In this paper, a type of nano-hybrid polyimide/silica film was prepared by hydrolysis and condensation of methyl-triethoxysilane that served as the precursor of the inorganic moiety and produced the nano-particle of silica, in-situ, in the polyamic acid solution through a sol-gel reaction. The chemical structure and surface morphology of the films were characterized by Fourier transform infrared spectroscopy...
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