Influence of Zinc Substitution on Hydroxyapatite Structure Prepared by Chemical Precipitation Method

2018 ◽  
Vol 879 ◽  
pp. 3-7 ◽  
Author(s):  
Nisakorn Nuamsrinuan ◽  
Patcharin Naemchanthara ◽  
Pichet Limsuwan ◽  
Kittisakchai Naemchanthara
Keyword(s):  
Heat Treatment ◽  
Fourier Transforms ◽  
Chemical Precipitation ◽  
Zinc Nitrate ◽  
Treatment Temperature ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Phosphate Phase ◽  
Chicken Eggshell ◽  
Hydroxyapatite Phase

The zinc (Zn) substituted hydroxyapatite were synthesized using a chemical precipitation method. The chemical precursors were prepared from di-ammonium hydrogen orthophosphate, calcium oxide (CaO) derived from chicken eggshell and zinc nitrate (Zn(NO3)2). The Zn(NO3)2contents in the prepared samples were varied from 1 to 25 %wt of CaO. The Zn substituted hydroxyapatite were heated at the various temperatures from 200 to 1300 °C in the furnace with an incremental temperature of 100 °C. The crystal structure, function group and morphology of sample were analyzed by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM), respectively. The results show that the hydroxyapatite doped Zn was a hydroxyapatite phase as well as pure hydroxyapatite. The crystalline size of sample decreased with increasing the Zn content. And, the crystallinity of hydroxyapatite phase was increased following by increasing heat treatment temperature. However, the amount of Zn has the effect on phase transformation of hydroxyapatite phase after heat treatment. Zn concentration accelerates hydroxyapatite transforms to β-tricalcium phosphate phase.

Effect of Hydroxide Concentration and Adding Ascorbic Acid on Morphology Shape of Zinc Oxide Nanostructure Prepared by Simple Chemical Precipitation Method

2016 ◽  
Vol 848 ◽  
pp. 76-79
Author(s):  
Natpasit Chaithanatkun ◽  
Korakot Onlaor ◽  
Thutiyaporn Thiwawong ◽  
Benchapol Tunhoo
Keyword(s):  
Ascorbic Acid ◽  
Zinc Oxide ◽  
Ammonium Hydroxide ◽  
Chemical Precipitation ◽  
Zinc Nitrate ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Directional Growth ◽  
Zno Nanostructure ◽  
Xrd Techniques

A chemical precipitation method was used to prepare zinc oxide (ZnO) nanostructure in the present of zinc nitrate and ammonium hydroxide as zinc precursor and hydroxide precursor respectively. The effect of the hydroxide concentration and the effect of adding ascorbic acid as modifier into the mixture solution on the morphology property of zinc oxide was studied. The morphology and the structural of ZnO nanostructures were investigated by field-emission scanning electron microscope (FE-SEM) and X-ray diffractometer (XRD) techniques, respectively. The results showed that the basicity solution and adding stabilizer are important parameters on the morphology and structural properties of ZnO nanostructure. At a low hydroxide concentration, ZnO exhibited flower-like structure with short petal. With a further increase to higher concentration, ZnO crystal have more crystal directional growth. When the ascorbic acid was added, the morphology changed to particle-like structure. ZnO nanostructure with different shape might be used for specific applications such as gas sensor etc.

Effect of Heat Treatment on the Phase Transformation from SnS to Pure SnS2

2013 ◽  
Vol 829 ◽  
pp. 141-146
Author(s):  
Rahim Lotfi Orimi ◽  
Seyed Javad Mirdeylami
Keyword(s):  
Heat Treatment ◽  
Emission Spectra ◽  
Blue Shift ◽  
Chemical Precipitation ◽  
Treatment Temperature ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Absorption Studies ◽  
Absorbance Spectra

SnS2nanoparticles were prepared by heat treatment of SnS nanoparticles at 300 °C under N2atmosphere for 1hour. SnS nanoparticles have been synthesized by chemical precipitation method. As synthesized SnS nanoparticles, for determining the optimal temperature, were heated at various temperatures; 100, 150, 200, 250 and 300 °C N2atmosphere for 1hour. The products are characterized by X-ray diffraction (XRD) , ultraviolet visible (UV-vis) absorbance spectra and photoluminescence (PL). XRD and optical absorption studies show an increase in particle size with increasing heat treatment temperature from 100 to 200 °C . However, a large decrease in the nanoparticle size along with transforming from SnS to SnS2 is observed at 300 °C.In addition, the optical properties of al samples , including both UV-vis absorption and emission spectra showed a blue shift as the particles size decreased.

scholarly journals PHASE COMPOSITION AND CRYSTALLINITY OF HYDROXYAPATITE WITH VARIOUS HEAT TREATMENT TEMPERATURES

2018 ◽  
Vol 9 ◽  
pp. 87 ◽  
Author(s):  
Decky J Indrani ◽  
Bambang Soegijono ◽  
Wisnu A Adi ◽  
Neil Trout
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Phosphorous Acid ◽  
Chemical Precipitation ◽  
Hexagonal Structure ◽  
Treatment Temperature ◽  
Precipitation Method ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
Additional Phase

Objective: This study investigated effects of heat treatment on the crystallinity and phase composition of hydroxyapatites (HAs) of different heat treatment.Methods: HA powder was synthesized by the chemical precipitation method based on the reaction between the phosphorous acid and calcium hydroxide. Synthesized HA was divided into three groups for which each group was then given heat treatment at 100°C, 900°C, or 1300ºC. Phase identification, analyses and the crystallinity of the synthesized HAs were determined using the X-ray diffraction coupled with the Rietveld refinement.Results: The synthesized HAs with each heat treatment were identified as HA phase containing hexagonal structure. Those treated at 100°C or 900°C revealed with crystallinity of 48% and 68%, respectively, with no additional phase; whereas, those treated at 1300°C produced a crystallinity of 72% and contained dicalcium and tricalcium phosphates.Conclusion: The synthesized HAs treated at 100°C, 900°C, or 1300°C were HA phase with hexagonal structure. The variable crystallinity of the synthesized HAs yielded from different heat treatment temperature correspondingly determines different phase composition.

Modification of Structural and Vibrational Properties of ZnO Nanoparticles Prepared by Simple Chemical Precipitation Method

2016 ◽  
Vol 675-676 ◽  
pp. 138-141 ◽  
Author(s):  
Natpasit Chaithanatkun ◽  
Korakot Onlaor ◽  
Thutiyaporn Thiwawong ◽  
Benchapol Tunhoo
Keyword(s):  
Electron Microscope ◽  
Vitamin C ◽  
Structural Properties ◽  
Zno Nanoparticles ◽  
Hexagonal Phase ◽  
Chemical Precipitation ◽  
Zinc Nitrate ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Simple Chemical

In this work, zinc oxide (ZnO) nanoparticles were synthesized by simple chemical precipitation method in the present of zinc nitrate as zinc precursor and sodium hydroxide as hydroxide precursor. The vitamin C was used as modifier media to modify the structural properties of ZnO nanoparticles. The microstructures of ZnO nanoparticles were characterized by field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM). Selected area electron diffraction (SAED) patterns showed that polycrystalline hexagonal phase of ZnO. The defects and impurity contents in nanoparticles were investigated by Fourier transform infrared (FT-IR) spectroscopy. The results show few carboxylate and hydroxyl impurities for larger particles when addition modifier increases. Surface areas of nanoparticles were measured by Brunauer Emmett Teller (BET) method. In addition, the results exhibited the dramatically change in structural properties of ZnO nanoparticles due to the effect of vitamin C.

Effect of Gd doping on structural, surface and optical properties of ZnS prepared by chemical precipitation method

Optik ◽  
2017 ◽  
Vol 136 ◽  
pp. 259-264 ◽  
Author(s):  
Manivannan N. ◽  
Chandar Shekar B. ◽  
Senthil Kumaran C.K. ◽  
Sathyamoorthy R.
Keyword(s):  
Optical Properties ◽  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Structural Surface

Synthesis and photocatalytic properties of magnetic separable and recyclable p-n heterojunction CoFe2O4/Bi12O17Cl2 photocatalyst

CrystEngComm ◽  
2021 ◽  
Author(s):  
Kexin Fang ◽  
Lei Shi ◽  
Lishuang Cui ◽  
Chunwei Shi ◽  
Weiwei Si
Keyword(s):  
Chemical Precipitation ◽  
Photocatalytic Properties ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Crystallinity

A series of CoFe2O4/Bi12O17Cl2 (CFO/Bi12O17Cl2) nanocomposites have been prepared by chemical precipitation method. The result of X-ray diffraction showed that CFO/Bi12O17Cl2 composites had high crystallinity. It was found that CoFe2O4...

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