نتایج جستجو برای: fe sem
تعداد نتایج: 140289 فیلتر نتایج به سال:
A straightforward method is presented to produce catalyst particle-filled carbon nanotubes. Based on capillarity and surface tension, a simple strategy was developed to selectively fill carbon nanotubes with Fe, Co, and Ni species using a two-step method consisting of impregnation and selective washing. By chosing the impregnation and washing solution properly, metal particles are produced excl...
Excess heat was produced at the rate of about 1.2 watts during electrolysis of heavy water with a titanium cathode weighing 0.0625 g. Analysis of the electrodes before and after electrolysis with a scanning electron microscope (SEM) and an energy dispersive spectrometer (EDS) revealed that new surface topographical features with concentrations of unexpected elements (S, K, Ca, V, Cr, Fe, Ni, an...
restorations were assessed using modified RygefUSPHS criteria, Subsequently, restorations were evuluated at recall intervals up to 18 months. Additionally, the measurement of tensile bond strength and the FE-SEM observation of resin-tooth interface were performed in vitro. At 18 months, all restorations were classified as clinically satisfactery and assignecl with an Alpha rating. Tensile bond ...
We prepared micrometer-sized three-dimensional (3D) superlattices of gold nanoparticles protected by Nacetylglutathione (NAG). The nanoparticles were self-assembled at an air/water interface under a highly acidic condition. Morphological studies revealed that the superlattices formed fivefold symmetric structures such as decahedron and icosahedron, which were probably developed by multiple twin...
incorporation of [fe(bipy)cl4][bipy.h] (1) (where bipy is 2,2′-bipyridine) in the molecular sieves of the type lta, nay and mesoporous al-mcm-41 by using a “ship in a bottle synthesis” approach was investigated. [fe(bipy)cl4][bipy.h] was successfullyincorporated in the channels ofmesoporousal-mcm-41, and the product was characterized by x-ray diffraction, ftir and bet analysis. it was fou...
in this paper, labo3 perovskite type catalyst formulations were prepared by sol-gel auto combustion method using citric acid as the fuel. activity of catalysts was tested in catalytic oxidation of toluene as a model of volatile organic compounds. lacoo3 perovskite formulation showed the highest activity among labo3 (fe, mn and co) perovskite catalysts. so, lacoo3 perovskite based catalyst was s...
درتحقیقحاضر، ابتدامحلولکلوئیدینانوذراتنقرهازاحیاءنمکنیتراتنقرهبهروشاحیاءشیمیاییسنتزشد. دراین روش پلی وینیل الکل (pva)بهعنوانعاملپایدارکنندهوتریسدیمسیتراتبهعنوانعاملاحیاءکنندهمورداستفادهقرارگرفت. طیفسنجیجذبمرئی-فرابنفش (uv-vis) وتکنیکپراکندگیدینامیکینور (dls)تشکیلنانوذراتنقرهبااندازهمتوسط 43 نانومترراتاًییدکردند. درمرحلهبعدیپودرکفدریاخریداریشده،چندینمرتبهباآبمقطرشستشودادهشدوپسازخشککردنازالکعبور...
در این پژوهش تولید نانوپودر کامپوزیتی Co/ VC از مواد اولیه Co3O4، V2O5 و گرافیت با استفاده از پودر منیزیم به عنوان عامل احیا به روش مکانوشیمیایی بررسی شد. برای این منظور مخلوط پودری مواد طبق واکنش استوکیومتری در یک آسیا سیاره?ای پرانرژی با نسبت وزنی پودر به گلوله 1:20 تحت آتمسفر گاز آرگون در زمان?های مختلف آسیا شدند. پس از 10 دقیقه آسیاکاری احتراق صورت گرفته و با توجه به نتایج XRD، منیزیم توانس...
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