نتایج جستجو برای: hydrothermal crystallization
تعداد نتایج: 39763 فیلتر نتایج به سال:
Chlorite group minerals have a wide range of chemical compositions which reflect the physicochemical conditions of their crystallization. The solid solution (cationic substitution) model in crystal lattice of chlorite were satisfactorily used in estimation of its formation temperature in different geologic environments such as ore deposits, low-degree metamorphism, hydrothermal alteration and d...
Nanosized hydroxyapatite (HA) is a promising candidate for a substitute for apatite in bone in biomedical applications. Furthermore, due to its excellent bone bioactivity, nanosized strontium-substituted HA (SrHA) has aroused intensive interest. However, the size effects of these nanoparticles on cellular bioactivity should be considered. In this study, nanosized HA and SrHA with different dime...
Bismuth oxychloride photocatalysts were obtained using solvothermal synthesis and different additives (CTAB—cetyltrimethylammonium bromide, CTAC—cetyltrimethylammonium chloride, PVP–polyvinylpyrrolidone, SDS–sodium dodecylsulphate, U—urea TU—thiourea). The effect of the previously mentioned compounds was analyzed applying structural (primary crystallite size, crystal phase composition, etc.), m...
The D. João de Castro is a submarine volcano with known hydrothermal activity located in the Terceira ultra-slow spreading rift within Azores triple junction (ATJ). Several well-known mafic and ultramafic rock-hosted seafloor systems lay along Mid-Atlantic Ridge, to north south of platform, yet little about activity, ore-metal availability, magmatic–hydrothermal interactions ATJ. Here, we inves...
In the present study, a process of separating high-quality TiO2 from an oxalic-acid leachate vanadium slag was proposed. It consists two steps; oxalic acid firstly recovered by cooling-crystallization method, and subsequently separated hydrothermal precipitation method. The experimental results indicate that can be cooling crystallization at 5 °C, after recovery acid, purity final product also ...
silicon and aluminum sources are most important reactants in the synthesis of zeolite. the use of the silicon source has an important effect on the crystallization of zeolites. also, it can change the properties of the end product. this work reports the influence of three common commercial silica sources such as colloidal silica (ludox am-30), fumed silica and water glass on the crystallinity o...
in the present work, the synthesis of barium hexaferrite (bafe12o19) nanoparticles in thepresence of a large excess amount of oh− anions by the hydrothermal method in the presence and absence of surfactants such as sodium dodecyl benzene sulfonate and triton x-114 was reported. the optimized temperature in the absence of surfactant was determined (200 °c) and then barium hexaferrite nanoparticl...
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