نتایج جستجو برای: fumed silica
تعداد نتایج: 37206 فیلتر نتایج به سال:
The knowledge of photochemical kinetics in colloidal systems is important in understanding environmental photochemistry on dispersed solid surfaces. As model materials for the chemically sorbed organic compounds present in natural environments, modified silica nanoparticles (NPs) were obtained here by condensation of the silanol groups of fumed silica nanoparticles with 4-methoxybenzyl alcohol....
objective: the purpose of the study was to evaluate the influence of adding nanofiller particles to a dentin bonding agent on resin-dentin bond strength. materials and methods: fifty-four human intact premolar teeth were divided in to 6 groups of nine. the teeth were ground on occlusal surfaces and polished with 320 and then 600 grit silicon carbide papers. an experimental bonding system based ...
background: the removal of toxic metals from sewage and wastewaters is one of the most important concerns in the twenty first century. the removal of poisonous cr(vi) from aqueous solution by different low-cost available nanoporous adsorbents was investigated in the present study. methods: fumed silica, bentonite (bn), hydrotalcite (ht), mcm-41, na-y, mordenite (mor) and sapo-34 were used at d...
This study compares different polymer-nanofiller blends concerning their suitability for application as insulating thermoplastic composites High Voltage Direct Current (HVDC) cable application. Two polymer blends, PP/EOC (polypropylene/ethylene-octene copolymer) and PP/PP-HI (polypropylene/ propylene - ethylene nanocomposites filled with 2 wt.% of fumed silica modified 3-aminopropyltriethoxysil...
A new type of nitric oxide (NO)-releasing material is described that utilizes S-nitrosothiols anchored to tiny fumed silica (FS) particles as the NO donor system. The synthetic procedures suitable for tethering three different thiol species (cysteine, N-acetylcysteine, and N-acetylpenicillamine) to the surface of FS polymer filler particles are detailed. The thiol-derivatized particles are conv...
A useful technique which is used recently for improving the properties of liquid oxidizer is gellatioin. In the present research it is attempted to study the rheological properties of different IRFNA gels build with different amount of fumed silica as gallant. Rheological measurement indicate that the gels have desirable properties needed for a gel propulsion system like shear-thinning, hystere...
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