نتایج جستجو برای: s: sio2
تعداد نتایج: 724020 فیلتر نتایج به سال:
A b s t r a c t L i q u i d u s phase relationships in the system MgSiO3-SiO2 at 5.0 GPa have been determined using a multianvil apparatus. Compared to phase relationships at 1 atm, the MgSiO3-SiO2 phase diagram at 5.0 GPa is significantly different in two respects. First, the composition of the eutectic between MgSiO3 and SiO2 moves from 65.0 wt% SiO2 at 1 atm/1547°C (protoenstatite-cristobali...
A silicon dioxide (SiO2) electret passivates the surface of crystalline silicon (Si) in two ways: (i) when annealed and hydrogenated, the SiO2–Si interface has a low density of interface states, offering few energy levels through which electrons and holes can recombine; and (ii) the electret’s quasipermanent charge repels carriers of the same polarity, preventing most from reaching the SiO2–Si ...
The need for the development of new materials and strategies to enhance performance PEM fuel cell at low humidity platinum (Pt) loadings is becoming increasingly crucial. Due this fact, current study presents fabrication electrospun sulfonated silica (S-SiO2) as a poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE))-based, flexible, freestanding, highly porous novel cathode structure ce...
This study was undertaken to investigate the potential toxicity and establish the no observed adverse effect level (NOAEL) and target organ(s) of negatively charged colloidal silica particles of different sizes, ie, SiO2 (EN20(-)) (20 nm) or SiO2 (EN100(-)) 2(100 nm), administered by gavage in Sprague-Dawley rats. After verification of the physicochemical properties of the SiO2 particles to be ...
We have developed a fast solid state Li ion conductor composed of LiBH4 and SiO2 by means of interface engineering. A composite of LiBH4-SiO2 was simply synthesized by high energy ball-milling, and two types of SiO2 (MCM-41 and fumed silica) having different specific surface areas were used to evaluate the effect of the LiBH4/SiO2 interface on the ionic conductivity enhancement. The ionic condu...
Lithium-sulfur batteries have received great attention because of the high theoretical specific capacity, natural abundance, low cost, and environmental friendliness sulfur. However, poor cycling C-rate performance limit application Li-sulfur batteries. Placing porous highly conductive interlayer between separators sulfur cathodes is an efficient approach to improve active materials’ utilizatio...
A significant improvement ~220%! is reported in the low voltage ~2000 V! aging characteristics under cathodoluminescence ~CL! excitation for ZnS phosphors coated with 1.0 wt % SiO2 by the sol-gel technique. The formation of nanoscale uniform coating was confirmed by structural analysis. An improvement in chemical and thermal stability was also confirmed by chemical etching and heat-treatment of...
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