نتایج جستجو برای: wo3
تعداد نتایج: 1625 فیلتر نتایج به سال:
This paper proposes a suitable method for increasing effective surface area of electrodeposited WO3 thin films. This is done because effective surface area improves optical and electrochromic properties in smart windows. Therefore, we investigated precursor aging atperoxytungstate precursor (0, 24, 48 and 72 h). Experiments showed by increasing aging time of the precursor solution, larger aggre...
two facile and low cost routes were used for the synthesis of if-ws2 nanoparticles. in this paper, preparation of if-ws2 nanoparticles with two different methods was investigated. in the first method, wo3 nanoparticles were reacted with h2s gas in n2/h2 reducing atmosphere at 900 oc. the as-synthesized if-ws2 nanoparticles are spherical shape with an average size of about 70 nm. in the second ...
هدف اصلی از انجام این پایان نامه بررسی فعالیت فوتوکاتالیستی tio2 در ناحیه نور فرابنفش و بررسی اثر wo3 بر روی فعالیت فوتوکاتالیستی tio2 در ناحیه نور مرئی است. در این پروژه برای تولید نانو ذرات دی اکسید تیتانیوم از تترا کلرید تیتانیوم به عنوان ماده اولیه و از روش ترسیب که یک روش قابل انجام در مقیاس صنعتی می باشد استفاده گردید. با استفاده از نرم افزار تاگوچی تاثیر شرایط آزمایش نظیر مقدار wo3، ph، ...
The use of TiO2 nanoparticles in organic-based photocatalytic coatings imposes several challenges: poor activity under visible light, binder photo-degradation, need for UV activation and toxicity concerns. Here we present a scalable two-step synthesis route to prepare TiO2-based hollow microspheres (HoS) as alternative photocatalyst commercial nanoparticles. or WO3-doped (3 mol% WO3) are synthe...
We examine the possibility of high temperature superconductivity from two-dimensional semiconductor without antiferromagnetic fluctuations. The weak coupling BCS theory is applied, especially where the Fermi level is near the bottom of the conduction band. Due to screening, the attractive interaction is local in k-space. The density of states(DOS) does not have a peak near the bottom of the ban...
UV-visible diffuse reflectance spectroscopy was used to probe the electronic structure and domain size of tungsten oxide species in crystalline isopolytungstates, monoclinic WO3, and dispersed WOx species on ZrO2 surfaces. UV-visible absorption edge analysis, CO2 chemisorption, and Raman spectroscopic results show that three distinct regions of WOx coverage on ZrO2 supports appear with increasi...
In this work, reaction center protein (RC) isolated from Rhodobacter sphaeroides purple bacteria was coupled with WO3(∙0.33H2O) via physical adsorption, where vectorial electron transfer (from RCs towards the inorganic carrier) demonstrated using flash kinetics and photoluminescence measurements. The efficiency of interaction between correlated to components’ surface charge at working pH struct...
Composites that are including silicide of tungsten and boride of tungsten intermetallic compound have properties such as high hardness, relatively good thermal shock, chemical stability and high strength at high temperature. The purpose of this investigation is evaluation of phase and microstructure of alumina base composite reinforced by boride and silicide of tungsten in three systems 1-Al+...
Synthesis of three-dimensional photocatalysts offers great potential for chemical conversion and hydrogen generation as appropriate solutions environmental protection energy shortage challenges. In this study, the magnetic WO3–x@mesoporous carbon (M-WO3–x@MC) was synthesized through evaporation-induced self-assembly method applying diatom frustules a natural template. Then, plasma modification ...
Inorganic metal oxides have shown potential as matrices for assisting in laser desorption ionization with advantages over the aromatic acids typically used. Rhenium and tungsten oxides are attractive options due to their high work functions and relative chemical inertness. In this work, it is shown that ReO3 and WO3 , in microparticle (μP) powder forms, can efficiently facilitate ionization of ...
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