Erratum to “Effect of low temperature on formation mechanism of calcium phosphate nano powder via precipitation method” [Adv. Powder Technol. 23 (2012) 744–751]

2017 ◽  
Vol 28 (2) ◽  
pp. 686
Author(s):  
P. Moghimian ◽  
M.H. Khosravi ◽  
A. Najafi ◽  
S. Afshar ◽  
J. Javadpour ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Low Temperature ◽  
Formation Mechanism ◽  
Precipitation Method ◽  
Nano Powder

Upconversion luminescence properties of monodisperse spherical Y2O2S:Yb,Ho nanocrystals

2009 ◽  
Vol 24 (5) ◽  
pp. 1756-1760 ◽  
Author(s):  
Xixian Luo ◽  
Wanghe Cao ◽  
Mingming Xing
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Formation Mechanism ◽  
In Vivo Imaging ◽  
Upconversion Luminescence ◽  
Green Emission ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Homogeneous Precipitation Method

Monodisperse spherical Y2O2S:Yb,Ho nanocrystals with particle size about 50 nm were prepared by a modified homogeneous precipitation method combined with low-temperature sulfurization process. The Y2O2S:Yb,Ho nanocrystals exhibit an intense green emission assigned to the Ho3+ ions 5F4, 5S2 → 4I15/2 transition under 980 nm infrared pump. The upconversion luminescence brightness of Y2O2S:Yb,Ho is 526 Cd/m2 under 4.63 W/cm2 pump density, indicating that the as-prepared Y2O2S:Yb,Ho nanocrystals can meet the requirement of in vivo imaging. The formation mechanism of monodisperse spherical oxysulfide nanoparticles is also discussed.

scholarly journals Microwave-Assisted Fabrication of Mesoporous Silica-Calcium Phosphate Composites for Dental Application

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 53
Author(s):  
Adrian Szewczyk ◽  
Adrianna Skwira ◽  
Marta Ginter ◽  
Donata Tajer ◽  
Magdalena Prokopowicz
Keyword(s):  
Calcium Phosphate ◽  
Mesoporous Silica ◽  
Octacalcium Phosphate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Coating Solution ◽  
X Ray ◽  
Microwave Assisted ◽  
Calcium Orthophosphates ◽  
Different Types

Herein, the microwave-assisted wet precipitation method was used to obtain materials consisting of mesoporous silica (SBA-15) and calcium orthophosphates (CaP). Composites were prepared through immersion of mesoporous silica in different calcification coating solutions and then exposed to microwave radiation. The composites were characterized in terms of molecular structure, crystallinity, morphology, chemical composition, and mineralization potential by Fourier-transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy (SEM-EDX). The application of microwave irradiation resulted in the formation of different types of calcium orthophosphates such as calcium deficient hydroxyapatite (CDHA), octacalcium phosphate (OCP), and amorphous calcium phosphate (ACP) on the SBA-15 surface, depending on the type of coating solution. The composites for which the progressive formation of hydroxyapatite during incubation in simulated body fluid was observed were further used in the production of final pharmaceutical forms: membranes, granules, and pellets. All of the obtained pharmaceutical forms preserved mineralization properties.

Preparation and Characterization of the Nano Powder for Al2O3-SiO2-CaF2 Glass by Homo-Precipitation Method

2007 ◽  
Vol 280-283 ◽  
pp. 1643-1646
Author(s):  
G.C. Yuan ◽  
Q.G. Wu ◽  
G.X. Zeng ◽  
X.H. Zhang
Keyword(s):  
Citric Acid ◽  
Amorphous Structure ◽  
Precipitation Method ◽  
Inorganic Salts ◽  
Mixture Ratio ◽  
Nano Powder ◽  
Desiccation Process ◽  
Amorphous Compounds ◽  
Crystal Phases

The nano-powder of Al2O3-SiO2-CaF2 bio-glass was prepared by the homo-precipitation method with some inorganic salts containing Al3+, Ca2+, Na+, F-, SiO3 2+, Cl- as starting-reagents. The composition and characteristics of the powders were studied with XRD, EDAX, TEM and DTA. The results indicate that the prepared powder belongs to amorphous compounds containing Al, Ca, Si, O and F atoms and the size of particle is in the range of 30 ~ 70 nm. Adding citric acid and the well-controlled desiccation process can slightly improve the dispersing effect of the powders; the mixture ratio of the reagents rarely affects the characteristic of powder. The crystal phase CaF2 was precipitated firstly from the amorphous structure when the temperature is above 600°C, with the temperature rising, Al2SiO5 and Al4.4Si1.2O9.5 etc. crystal phases were precipitated sequentially.

scholarly journals The Effects of Calcium Excess, Water Amount and Mixing Time on the Injectability of Calcium Phosphate Filling Materials

2011 ◽  
Vol 110-116 ◽  
pp. 8-12 ◽  
Author(s):  
A.S.F. Alqap ◽  
Iis Sopyan ◽  
M. Husni ◽  
N. Athirah
Keyword(s):  
Calcium Phosphate ◽  
Low Temperature ◽  
Water Content ◽  
Hydrothermal Method ◽  
Mixing Time ◽  
Injection Test ◽  
Filling Materials ◽  
Excess Water ◽  
Strict Control ◽  
Water Amount

Variation of calcium excess, water content and mixing time have been taken into the parameters of the injection test of calcium phosphate paste synthesized via low temperature hydrothermal method. The result indicated that all the parameters are very prominent to influence the material injectability possible to be fully injected out the syringe. Strict control of paste synthesizing parameters has successfully overcome poor injectability of the material.

scholarly journals Formation mechanism of InAs nanostructures on GaAs (001) surface at low temperature

2021 ◽  
Vol 70 (19) ◽  
pp. 193601-193601
Author(s):  
Wang Yi ◽  
◽  
Ding Zhao ◽  
Yang Chen ◽  
Luo Zi-Jiang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Formation Mechanism
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