Global ETD Search
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Showing 1 to 7 of 7 for “"NH4F"”.
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Ionothermal Synthesis of High Silica Zeolites in Deep Eutectic Solvents (DES)
… by using the mineralizing agents NaOH and NH4F, respectively. In urea/choline chloride, ZSM-5, Beta, ZSM-39, and ZSM-11 were made by using different organic SDAs in the presence of fluoride. The reaction temperature and the choice of organic SDA affect the type of structures being produced. …
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An Approach Towards Sustainable Synthesis of MXene and High-Performance Cementitious Composites
… we investigate the use of ammonium fluoride (NH4F) as a safe alternative. Our findings, supported by various analytical techniques, confirm NH4F's effectiveness in Al removal and in the production of 2D MXene flakes. Additionally, we explore a novel non-fluoride-based chemical method using …
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An investigation into the fluorination capabilities of ammonium acid fluoride under microwave radiation with respect to zircon
… zircon was treated with ammonium acid fluoride (NH4F∙1.5HF) by means of microwave assisted digestion. Reaction times ranged from 10 to 330 minutes at temperatures between 100 °C and 240 °C. Successive microwave digestion steps, interrupted by an aqueous wash procedure, resulted in a >99 % …
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Additive Fabrication and Soft -Lithographic Patterning of Microelectronic Devices
… same polymer template as a resist to buffered HF/NH4F oxide etchant. The silicon metal-oxide-semiconductor field effect transistor (MOSFET) fabrication detailed in chapter 4 demonstrates the successful use of soft-lithographic surface patterning in the fabrication of silicon devices requiring …
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Fabrication and characterization of nanostructured fluorine doped tin oxide thin film for dssc by hydrothermal method
… of tin (iv) chloride (SnCl4), ammonium fluoride (NH4F), acetone, deionized water and hydrochloric acid (HCl). The compound was prepared in an autoclave at 150°C hydrothermal temperature for different reaction times of 5 hours, 10 hours, 15 hours, and 20 hours. FESEM studies on the surface …
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Upconversion Phosphors for Efficient Solar Energy Harvesting
… were prepared via precipitation. Increasing the NH4F content added and decreasing its addition rate, obtained upconverters with improved crystallinity, size and structure control, with increased upconverted emission intensities particularly at higher energies compared to its NaYF4 analogues. …
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Electrochemická syntéza, charakterizace a aplikace nových typů 1D oxidických struktur přechodných kovů
… speciálně formulované elektrolytu obsahujícího NH4F/H2O/ethylene glycol s přídavkem mléčné kyseliny (LA). Výsledky ukazují, že regulací stáří a složení elektrolytu a použitím dostatečně vysokých potenciálů lze dosáhnout vrstev HAR TNT s vysokým poměrem délka/šířka (přibližně 450) v pozoruhodně …