Results 1 to 10 of about 3,135 (181)

Enhanced reactivity of dicalcium phosphate dihydrate with fluoride ions by coating with apatite nanoparticles

Journal of Asian Ceramic Societies, 2021
The formation of nanoscale precursors on the surface of dicalcium phosphate dihydrate (DCPD) is an important step in various methods; however, this process requires an unstable solution.
Natsuki Okajima, Masamoto Tafu, Takeshi Toshima, Masafumi Takada, Yoshiaki Hagino   +4 more
doaj   +1 more source

IMPURITY LUMINESCENCE CENTERS IN FLUORAPATITE FROM QUARTZ-BEARING PARAGENESIS ACCORDING TO PHOTO-, CATHODE- AND SYNCHROTRON-INDUCED LUMINESCENCE

Геодинамика и тектонофизика, 2022
Apatite is typically characterized by a wide variety of spectrum and kinetic characteristics of luminescence; luminescent images of grains are often zonal.
Yu. V. Shchapova, S. I. Votyakov, G. B. Mikhalevsky, V. Yu. Ivanov, V. A. Pustovarov   +4 more
doaj   +1 more source

Application progress of molecular simulation in phosphate ore flotation

矿业科学学报, 2023
Flotation is the main method to improve the quality and reduce the impurity of calcium magnesium phosphate ore. However, the similar surface physical and chemical properties of dolomite and fluorapatite make it difficult to separate efficiently. With the
Zhang Qin, Li Xianbo, Mao Song, Zhang Tiebin   +3 more
doaj   +1 more source

Mineral authigenesis within chemosynthetic microbial mats: Coated grain formation and phosphogenesis at a Cretaceous hydrocarbon seep, New Zealand

The Depositional Record, 2021
Marine hydrocarbon seeps are sites of chemosynthetic microbial activity and authigenic carbonate formation. Seep limestones are typified by a range of geochemical signatures of microbial hydrocarbon oxidation, but only few seep deposits reveal ...
Jennifer Zwicker, Daniel Smrzka, Florian Steindl, Michael E. Böttcher, Eugen Libowitzky, Steffen Kiel, Jörn Peckmann   +6 more
doaj   +1 more source

A New Perspective on Fluorapatite Dissolution in Hydrochloric Acid: Thermodynamic Calculations and Experimental Study

Inorganics, 2021
Apatite (Ap) dissolution in diluted acids is well described in the literature, but in technological processes which use more concentrated acids, the reaction is fast, and it is complicated to follow the process kinetics.
Kaia Tõnsuaadu, Juha Kallas, Rein Kuusik, Gizem Hacialioglu-Erlenheim, Andres Trikkel   +4 more
doaj   +1 more source

Synthesis and structural properties of europium-doped fluorapatite nanoparticles as a promising luminescent biomaterial [PDF]

Science of Sintering
Europium-doped fluorapatite $\mathrm{Ca}_{10-x}(\mathrm{PO}_{4})_{6}\mathrm{F}_{2}:x\mathrm{Eu}^{3+}$ (x = 0.05, 0.1 and 0.5) nanoparticles were successfully synthesised by a coprecipitation method at room temperature and calcination at 700 ⁰C ...
Stanić Vojislav, Omerašević Mia, Mutavdžić Dragosav, Marinović-Cincović Milena, Milović Miloš, Mraković Ana, Tanasković Slađana   +6 more
doaj   +1 more source

Adsorption Behaviors of Different Water Structures on the Fluorapatite (001) Surface: A DFT Study

Frontiers in Materials, 2020
To investigate the effect of hydration behavior on the fluorapatite structure, single H2O molecule and three-layer water cluster adsorptions on the fluorapatite (001) surface were performed by means of density functional theory.
Weiyong Cui, Xueli Song, Jianhua Chen, Jianhua Chen, Ye Chen, Ye Chen, Yuqiong Li, Cuihua Zhao   +7 more
doaj   +1 more source

Synthesis of fluorapatite nanopowders by a surfactant-assisted microwave method under isothermal conditions [PDF]

Nuclear Technology and Radiation Protection, 2018
Fluorapatite nanopowders with different amounts of fluoride ions were prepared using the surfactant-assisted microwave method under isothermal conditions. Microwave irradiation was applied for the rapid formation of crystals. A micellar solution
Stanić Vojislav Đ., Adnađević Borivoj K., Dimitrijević Suzana I., Dimović Slavko D., Mitrić Miodrag N., Zmejkovski Bojana B., Smiljanić Slavko   +6 more
doaj   +1 more source

Formation of Fluorapatite in the Equilibrium System CaO–P₂O₅–HF–H₂O at 298 K in a Nitrogen Atmosphere

Crystals, 2023
The process of biomineralization of apatite in nature has been studied by scientists from various fields of science for more than a century. Unlike the volcanogenic, hydrothermal, and other types of igneous apatites, the genesis of which is entirely ...
Marina V. Chaikina, Natalia V. Bulina, Igor Yu. Prosanov, Arcady V. Ishchenko   +3 more
doaj   +1 more source

Evaluating hydrothermal synthesis of fluorapatite nanorods: pH and temperature

Journal of Experimental Nanoscience, 2017
In this study, the fluorapatite was synthesised by a hydrothermal technique in different pH and temperature using apricot tree gum surfactant. The fluorapatite was synthesised in different shapes such as spherical, Chrysanthemum flower and rod.
Mohammad Mahdi Taheri, Mostafa Rezazadeh Shirdar, Ali Keyvanfar, Arezou Shafaghat   +3 more
doaj   +1 more source