Synthesis of Nanostructured Hydroxyapatite: A Comparative Study between Sol-Gel and Aqueous Solution Precipitation

2008 ◽  
Vol 396-398 ◽  
pp. 623-626 ◽  
Author(s):  
L.R. Rodrigues ◽  
M. Motisuke ◽  
Cecília A.C. Zavaglia
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Calcium Phosphate ◽  
Comparative Study ◽  
Sol Gel ◽  
Mechanical Resistance ◽  
Commercial Sample ◽  
Phase Purity ◽  
Characterization Study ◽  
Sol Gel Synthesis

Particle size is one of the most important factors to the successful application of calcium phosphate bioceramics as it may have an important role on its final properties such as mechanical resistance and reactivity. Thus, a process which results on very small and homogeneous particles is required, since it avoids further contamination derived from long milling times. On this context, a process such as sol-gel synthesis may be feasible, due to its simplicity on handling and its well known characteristic of producing homogeneous nanoparticles. Moreover, precipitated HA also may lead to satisfactory results regarding particle size and phase purity. The aim of this article was to demonstrate a preliminary characterization study of powders obtained by both methods and to compare them to a commercial sample available in Brazil. Characterization was made by XRD, Scherrer’s equation, XRF, SEM-LV, SEM-FEG and SEM-EDS. It has been found out that all samples consist of pure nanostructured hydroxyapatite with crystallite size between 37nm and 62nm.

scholarly journals Sol-Gel Synthesis of the Double Perovskite Sr2FeMoO6 by Microwave Technique

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3876
Author(s):  
Jesús Valdés ◽  
Daniel Reséndiz ◽  
Ángeles Cuán ◽  
Rufino Nava ◽  
Bertha Aguilar ◽  
...  
Keyword(s):  
Particle Size ◽  
Hydrothermal Synthesis ◽  
Microwave Radiation ◽  
Structural Characteristics ◽  
Sol Gel ◽  
Synthesis Method ◽  
Double Perovskite ◽  
Synthesis Methods ◽  
X Ray ◽  
Sol Gel Synthesis

The effect of microwave radiation on the hydrothermal synthesis of the double perovskite Sr2FeMoO6 has been studied based on a comparison of the particle size and structural characteristics of products from both methods. A temperature, pressure, and pH condition screening was performed, and the most representative results of these are herein presented and discussed. Radiation of microwaves in the hydrothermal synthesis method led to a decrease in crystallite size, which is an effect from the reaction temperature. The particle size ranged from 378 to 318 nm when pH was 4.5 and pressure was kept under 40 bars. According to X-ray diffraction (XRD) results coupled with the size-strain plot method, the product obtained by both synthesis methods (with and without microwave radiation) have similar crystal purity. The Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques showed that the morphology and the distribution of metal ions are uniform. The Curie temperature obtained by thermogravimetric analysis indicates that, in the presence of microwaves, the value was higher with respect to traditional synthesis from 335 K to 342.5 K. Consequently, microwave radiation enhances the diffusion and nucleation process of ionic precursors during the synthesis, which promotes a uniform heating in the reaction mixture leading to a reduction in the particle size, but keeping good crystallinity of the double perovskite. Precursor phases and the final purity of the Sr2FeMoO6 powder can be controlled via hydrothermal microwave heating on the first stages of the Sol-Gel method.

Sol-gel synthesis of a ceramic based on calcium phosphate

2010 ◽  
Vol 83 (12) ◽  
pp. 2094-2099 ◽  
Author(s):  
N. N. Khimich ◽  
N. D. Eller ◽  
E. N. Khimich ◽  
D. M. Danilovich ◽  
E. V. Golikova
Keyword(s):  
Calcium Phosphate ◽  
Sol Gel ◽  
Sol Gel Synthesis

Sol–gel synthesis of NASICON discs from aqueous solution

1997 ◽  
Vol 7 (8) ◽  
pp. 1457-1460 ◽  
Author(s):  
Youichi Shimizu ◽  
Yasunori Azuma ◽  
Satoko Michishita
Keyword(s):  
Aqueous Solution ◽  
Sol Gel ◽  
Sol Gel Synthesis

Features of the sol-gel synthesis of TiO2 nanolayers with calcium phosphate structures on titanium surface

2017 ◽  
Vol 87 (2) ◽  
pp. 340-341
Author(s):  
A. Yu. Arbenin ◽  
E. G. Zemtsova ◽  
E. V. Orekhov ◽  
V. M. Smirnov
Keyword(s):  
Calcium Phosphate ◽  
Titanium Surface ◽  
Sol Gel ◽  
Sol Gel Synthesis

Sol–gel synthesis of alumina modified by phosphorus: a solid state NMR characterization study

1999 ◽  
Vol 9 (10) ◽  
pp. 2637-2646 ◽  
Author(s):  
Juliette Quartararo ◽  
Michel Guelton ◽  
Monique Rigole ◽  
Jean‐Paul Amoureux ◽  
Christian Fernandez ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Sol Gel ◽  
Characterization Study ◽  
Nmr Characterization ◽  
Sol Gel Synthesis

Comparative study of sol–gel-hydrothermal and sol–gel synthesis of titania–silica composite nanoparticles

2005 ◽  
Vol 178 (5) ◽  
pp. 1395-1405 ◽  
Author(s):  
Zhijie Li ◽  
Bo Hou ◽  
Yao Xu ◽  
Dong Wu ◽  
Yuhan Sun ◽  
...  
Keyword(s):  
Comparative Study ◽  
Sol Gel ◽  
Composite Nanoparticles ◽  
Silica Composite ◽  
Sol Gel Synthesis

SOL-GEL SYNTHESIS AND CHARACTERIZATION OF COPPER STABILIZED ZIRCONIA NANOPARTICLES

2011 ◽  
Vol 25 (21) ◽  
pp. 2823-2839 ◽  
Author(s):  
Y. VAHIDSHAD ◽  
H. ABDIZADEH ◽  
H. R. BAHARVANDI ◽  
M. AKBARI BASERI
Keyword(s):  
Particle Size ◽  
Hydrogen Production ◽  
Calcination Temperature ◽  
Aging Temperature ◽  
Sol Gel ◽  
Chelating Agent ◽  
Molar Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sol Gel Synthesis

A sol-gel method is investigated to synthesize CuO – ZrO 2 nanoparticles as catalyst for hydrogen production from methanol. Finer precursor nanoparticles give rise to larger specific areas in catalyst which result in a high hydrogen production. The effects of some critical process parameters on the sol-gel synthesis of CuO – ZrO 2 nanoparticles are studied. These parameters are affected on synthesis of CuO – ZrO 2 when it is prepared with sol-gel method. Particle size and distribution are considered as the results. The parameters including the effect of calcination temperature, aging temperature, nature and concentration of catalyst (acidic or basic conditions), H 2 O /precursor molar ratio, and chelating agent that have been identified as most important, are focused. It is found that the calcination temperature strongly influenced the morphology and interaction between the active species and support, and hence the structure and catalytic performance. Nature and concentration of catalyst ( pH value), chelating agent, ( H 2 O /precursor) molar ratio and also aging temperature have influence on the nanoparticles. Thus, by controlling these factors, it is possible to vary the morphology and properties of the sol-gel-derived inorganic network over wide ranges. Morphology, particle size and distribution, phase evaluation, structure, and chemical analysis of the products are investigated by SEM, TEM, DTA/TG, XRD and EDX respectively.

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