scholarly journals Synthesis and Characterization of Hydroxyapatite Nanoparticles using Sol-Gel Method

2010 ◽  
Vol 13 (1-2) ◽  
pp. 85 ◽  
Author(s):  
S. Manocha ◽  
Parth Joshi ◽  
Bhavini Patel ◽  
L.M. Manocha
Keyword(s):  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Calcium Nitrate ◽  
Calcium Nitrate Tetrahydrate ◽  
Gravimetric Analysis ◽  
Hydroxyapatite Nanoparticles ◽  
Gel Method ◽  
Sol Gel Method ◽  
Biological Compatibility ◽  
Nitrate Tetrahydrate

<p>Hydroxyapatite (HAp) is a unique material having high adsorption capacity of heavy metals, high ion exchange capacity, high biological compatibility, low water solubility, high stability under reducing and oxidizing conditions, availability and low cost. Hydroxyapatite nanoparticles have been synthesized by Sol-gel method using Calcium nitrate tetrahydrate [Ca(NO<sub>3</sub>)<sub>2</sub>•4H<sub>2</sub>O] and Phosphorus pentaoxide (P<sub>2</sub>O<sub>5</sub>) as starting reactants. The addition of Phosphorus pentaoxide to Calcium nitrate tetrahydrate was carried out slowly with simultaneous stirring. After addition, solution was aged for 10 minutes for maturation. The precipitate was dried at 80 °C overnight and further heat treated at 550 °C for 2 hours. The dried and calcined particles were characterized by X-ray diffractometry, Fourier transform infra-red spectroscopy and Thermo gravimetric analysis. The particle size and morphology were studied using transmission electron microscopy. TEM examination of the treated powders displayed particles of polygon morphology with dimensions 20-50 nm in length. The FT-IR spectra for sample confirmed the formation of hydroxyapatite.</p>

Synthesis of Pure Hydroxyapatite (Ca10(PO4)6(OH)2) by the Sol–Gel Method and the Antibiotic Loaded in the Presence of Natural Polymer for the Application of Drug Delivery

2018 ◽  
Vol 24 (8) ◽  
pp. 5523-5526 ◽  
Author(s):  
B Shalini ◽  
A. Ruban Kumar ◽  
A. Mary Saral
Keyword(s):  
Ph Value ◽  
Drug Loading ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Average Crystallite Size ◽  
Ammonia Solution ◽  
Calcium Nitrate Tetrahydrate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Nitrate Tetrahydrate

Hydroxyapatite (HAp) is the most widely accepted biomaterial for the repair and reconstruction of bone tissue defects. The current study is based on HAp was synthesized using sol–gel method. The drug was loaded in presence and absence of gelatin with pure HAp. Precursors like calcium nitrate tetrahydrate and diammonium hydrogen orthophosphate were used and ammonia solution was added to maintain the pH value at 10.5 throughout the reaction. The synthesized HAp, drug loaded HAp and drug loaded HAp with gelatin were characterized using PXRD, FTIR, SEM, Drug loading, drug release studies. Results shows that the average crystallite size of the prepared HAp and drug loaded HAp with gelatin are 30 to 60 nm and 100 to 300 nm respectively was calculated using PXRD and morphology of pure HAp and drug loaded HAp with polymer was found using SEM. Drug loading and release percentage was calculated.

Effects of Polyethylene Glycol and Methacryloxypropyltrimethoxysilane on Morphology and Bioactivity of CaO-SiO2 Gel Prepared by Sol-Gel Method

2006 ◽  
Vol 309-311 ◽  
pp. 317-320 ◽  
Author(s):  
Ill Yong Kim ◽  
Chikara Ohtsuki ◽  
Masanobu Kamitakahara ◽  
Masao Tanihara ◽  
S.B. Cho
Keyword(s):  
Polyethylene Glycol ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Organic Matrix ◽  
Molar Ratio ◽  
Calcium Nitrate Tetrahydrate ◽  
Spherical Powder ◽  
Gel Method ◽  
Sol Gel Method ◽  
Nitrate Tetrahydrate

CaO-SiO2 gels for bioactive organic-inorganic composites were prepared from tetraethoxysilane (TEOS) and calcium nitrate tetrahydrate (Ca(NO3)2⋅4H2O) by a sol-gel method with the addition of polyethylene glycol (PEG) and methacryloxypropyltrimethoxysilane (MPS). The effects of PEG and MPS on morphology and bioactivity of the gel were investigated. The samples with the nominal compositions of Ca(NO3)2:TEOS:MPS = 30:70:0 and 30:63:7 (in molar ratio) were prepared with or without coexistence of PEG at a molar ratio of (TEOS+MPS):PEG = 70:0.16. Spherical powders were obtained regardless of the addition of MPS after removal of PEG by washing, whereas the samples prepared without PEG gave crack-free bulk bodies. Incorporation of MPS was confirmed form the results of Fourier transform infrared spectroscopy (FT-IR). All the samples, regardless of addition of PEG and MPS, formed apatite on their surfaces in simulated body fluid (SBF), when washing time was 3 h during the preparation. These results show that the bioactive spherical powder of CaO-SiO2 gel modified with MPS can be obtained by the present method. It is expected to induce the increase of the chemical bonding with surrounding organic matrix when it was used as fillers for composite materials.

Sodium-Doped Hydroxyapatite Nanopowder through Sol-Gel Method: Synthesis and Characterization

2011 ◽  
Vol 694 ◽  
pp. 128-132 ◽  
Author(s):  
Erlani Pusparini ◽  
Iis Sopyan ◽  
Mohd. Hamdi ◽  
Singh Ramesh
Keyword(s):  
Sol Gel ◽  
Calcium Nitrate ◽  
Xrd Analysis ◽  
Sodium Concentration ◽  
Calcium Nitrate Tetrahydrate ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Transmission Electron ◽  
Nitrate Tetrahydrate

The nanocrystalline HA powders were produced through sol-gel method which employed calcium nitrate tetrahydrate [Ca(NO3)2.4H2O] and diammonium hydrogen phosphate [(NH4)2HPO4] as calcium and phosphorous precursors. Sodium ion (Na+) is one of the trace elements found in biological apatite and believed to have important effect in its performance. The concentrations of sodium dopant were varied from 0 mol% until 15 mol% by using sodium nitrate (NaNO3) as the source of dopant. Characterization of nanopowders was investigated by using X-ray diffraction (XRD), Fourier transform infra red (FTIR) and Transmission Electron Microscope (TEM). XRD analysis revealed that there are no other phases exist in the synthesized powder, evinced single phase of HA and a trend shows an increase of cristallinity with increase of sodium dopant concentration. While the TEM images showed evidence that the particle sizes were bigger with the increasing sodium concentration, showing the effect of sodium dopant on the densification of the powder.

Preparation of Nano-Ceramics via Aqueous Sol-Gel Method Modified with Surfactants: An Overview

2010 ◽  
Vol 644 ◽  
pp. 79-84
Author(s):  
Yibran Perera
Keyword(s):  
Electron Microscopy ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Calcium Nitrate Tetrahydrate ◽  
Gravimetric Analysis ◽  
Nano Materials ◽  
Scanning Calorimetry ◽  
Gel Method ◽  
Sol Gel Method ◽  
Silica Alumina

The present paper shows an overview related to the preparation and characterization of different nano-materials such as: silica, alumina, di- and tri-calcium silicates and a composite in the ternary CaO-SiO2-Al2O3 system. These nano-materials are related to the construction area so some basic tests are carried out to evaluate their cementitious and/or pozzolanic behavior. The nano-ceramics have been synthesized via hydrolysis and condensation of aqueous sol-gel method modified with surfactants using different precursors such as: tetraethyl orthosilicate (TEOS), calcium nitrate tetrahydrate (Ca(NO3)2.4H2O), sodium silicate (Na2O.SiO2), aluminum nitrate nonahydrate (Al(NO3)3•9H2O) and an industrial aluminum hydroxide (gibbsite). The synthesis parameters such as: pH, temperature, kind of surfactants, etc., are reported. To characterize the structural, chemical composition, particle size and morphology of the nanoparticles, different techniques such as: Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), field emission electron microscopy (FESEM) and high-resolution transmission electron microscopy (HR-TEM) are used.

Synthesis of Y0.2ZrXCe0.8−XO1.9 Electrolytes From the Sol-Gel Method for Intermediate Temperature URSOFC Application

2012 ◽  
Vol 9 (4) ◽  
Author(s):  
Guo-Bin Jung ◽  
Ting-Chu Jao ◽  
Chia-Chen Yeh ◽  
Ming-Hsien Huang ◽  
Wang-Shen Su
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Relative Density ◽  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Intermediate Temperature ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Precipitation

A series of Y0.2ZrxCe0.8−xO1.9 compounds (0 ≤ x ≤ 0.6) had been prepared by the modified sol-gel method and characterized by powder X-ray diffraction, thermo-gravimetric analysis, four-probe resistivity, and Vickers’s hardness studies. The gels from co-precipitation were treated with heated 1-octanol. All of the samples showed fluoride structure after calcined at 600 °C. Sintering the powders of Y0.2Ce0.8O1.9 and Y0.2Zr0.6Ce0.2O1.9 at 1300 °C gave the relative density of 95.8% and 99%, respectively. 99% relative density could be obtained for all samples after sintering at 1500 °C. This study showed a much more improved result than that of the previous reports. The hardness was 13.7 GPa for the Y0.2Zr0.6Ce0.2O1.9 pellet, which was twice greater than that for Y0.2Ce0.8O1.9 (7.1 GPa). Therefore, the mechanical properties could be improved by the addition of ZrO2 to Y0.2ZrxCe0.8−xO1.9. At 800 °C, the electrical conductivity of Y0.2Ce0.8O1.9 and Y0.2Zr0.6Ce0.2O1.9 were 3.3 × 10−2 S/cm and 5.5 × 10−3 S/cm, respectively. The conductivity was decreased by the addition of ZrO2 to Y0.2Ce0.8O1.9. It showed that the conductivity and hardness of Y0.2Zr0.2Ce0.6O1.9 were 1.2 × 10−2 S/cm and 9.6 GPa, respectively, at 800 °C and could be a better electrolyte candidate for “intermediate-temperature” unitized regenerative solid oxide fuel cells.

Low Temperature Preparation of Aluminum Titanate Film via Sol-Gel Method

2014 ◽  
Vol 936 ◽  
pp. 238-242
Author(s):  
Yi Bao ◽  
Wei Hui Jiang ◽  
Guo Feng ◽  
Jian Min Liu ◽  
Qian Wu
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Chelating Agent ◽  
Tetrabutyl Titanate ◽  
Gravimetric Analysis ◽  
Aluminum Titanate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Low Temperature Preparation

Aluminum titanate (Al2TiO5) film was prepared via sol-gel method at low temperature, using ethyl acetoacetate and anhydrous citric acid as compound chelating agent, tetrabutyl titanate (Ti (OC4H9)4) and aluminum chloride (AlCl3.6H2O) as precursors, ethanol as solvent. The phase transformation of Al2TiO5 xerogel during heat treatment, the effect of different chelating agents on the synthesis of Al2TiO5, and the phase composition and morphology of film were investigated by means of differential thermal and thermo gravimetric analysis (DTA-TG), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR) and field-emission scanning electron microscopy (FE-SEM). The results demonstrate that Al2TiO5 can be synthesized at 750 °C by using compound chelating agent, rather than single chelating agent. Compound chelating agent contributes to the formation of Al-O-Ti heterogeneous bond, which is the key to preparing Al2TiO5 at low temperature. High quality Al2TiO5 film could be coated on the SiC substract at 750°C.

Sol-Gel Derived Gradient Biocoatings on Titanium Alloy

2011 ◽  
Vol 80-81 ◽  
pp. 426-430 ◽  
Author(s):  
Dai Hua He ◽  
Qian Zhao ◽  
Chang Bao Wang ◽  
Hao Zhang ◽  
Xiao Run Zhang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Calcium Nitrate Tetrahydrate ◽  
Homogeneous Microstructure ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ha Coating ◽  
Gradient Coatings ◽  
Xrd Techniques

The bioceramic hydroxyapaptie (HA) is frequently used as coat in titanium medical implants improving bone fixation and thus increasing a lifetime of the implant. However, its joining to the titanium alloy is not satisfactorily good. The aim of this work is to produce TiO2and HA gradient coatings on Ti6Al4V alloy to improve the interface joining. Compared the microstructures of cross section of Ti6Al4V-HA coating and Ti6Al4V-TiO2/HA gradient coatings. HA coatings were obtained by sol-gel method with sol solutions prepared from calcium nitrate tetrahydrate and triethyl phosphate as the calcium and phosphorous sources. And TiO2 coatings were obtained from Tetra Butyl Titanate and absolute ethyl alcohol as the sources by sol-gel method too. The configuration and structure were investigated with scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The results demonstrated that the TiO2/HA gradient coatings have a homogeneous microstructure. The TiO2coating made the HA coating adhere to the Ti-6Al-4V substrate well.

Investigation of Nanostructure and Magnetic Properties of Nanocrystalline NiZnCu Ferrites Synthesized by Sol-Gel Method

2015 ◽  
Vol 754-755 ◽  
pp. 1169-1174 ◽  
Author(s):  
Prengki Pransisco ◽  
Afza Shafie ◽  
Beh Hoe Guan
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Crystallite Size ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Variable Pressure ◽  
Gravimetric Analysis ◽  
Gel Method ◽  
Sol Gel Method

Nanocrystalline material of ferrites with composition Ni0.5Zn0.35Cu0.15Fe2O4was successfully synthesized by sol-gel method. This paper investigates nanostructure and magnetic properties of nanocrystaline material Ni0.5Zn0.35Cu0.15Fe2O4.Crystallite size, intensity,d-spacing and lattice parameters of material were investigated by using X-Ray diffractometer (XRD). While nanostructure, size, shape, surface morphology and topography of Ni0.5Zn0.35Cu0.15Fe2O4were examined by variable pressure field emission scanning electron microscope (VP-FESEM) SUPRA 55VP. Magnetic properties was investigated using vibrating sample magnetometer (VSM). According to thermo gravimetric analysis (TGA) result, it was found that after temperature 600oC there is no more weight loss detected and it was considered as minimum calcination temperature. XRD result shows that the samples is in single-phase cubic spinel structure. Crystallite size of the material is in range of 42.3-163.7nm. Highest intensity was 88.89 arb.units at highest calcination temperature 900oC. The value of d-spacing and FWHM decrease with increasing calcination temperature. Lattice paramenters decrease in the range of 8.4040-8.2458oA. VP-FESEM analysis shows that grain size increase by increasing calcination temperature. Grain size of the material is in the range of 47.6-506.9nm with cubic structure of the Ni0.5Zn0.35Cu0.15Fe2O4.VSM result shows that the highest value of magnetic saturation was at 152.8emu/g. The best value of coercive force (Hc) was in 31.8Oe and magnetic remanence (Mr) was in 2.6emu/g.

scholarly journals Thermal properties and water repellency of cotton fabric prepared through sol-gel method

2016 ◽  
Vol 20 (3) ◽  
pp. 863-866 ◽  
Author(s):  
Jia-Li Gu ◽  
Qiang-Hua Zhang ◽  
Yun-Bo Chen ◽  
Guo-Qiang Chen ◽  
Tie-Ling Xing
Keyword(s):  
Thermal Properties ◽  
Cotton Fabric ◽  
Sol Gel ◽  
Water Repellency ◽  
Gravimetric Analysis ◽  
Limiting Oxygen Index ◽  
Gel Method ◽  
Sol Gel Method ◽  
Silica Hydrosol ◽  
Phosphorus Doped

Cotton fabrics were treated by one-step sol-gel method. The pure silica hydrosol and phosphorus-doped hydrosol were prepared with the addition of a hydrophobic hexadecyltrimethoxysilane to decrease the surface energy of cotton fabric. The thermal properties and water repellency of treated cotton fabric were characterized by thermo-gravimetric analysis, micro combustion, limiting oxygen index, and contact angle measurement. The results showed that cotton fabric treated by phosphorus-doped silica hydrosol had excellent flame retardance, and the water repellence was apparently improved with the addition of hexadecyltrimethoxysilane.

Low temperature synthesis of wollastonite using sol–gel combustion method: In vitro bioactivity evaluation

2019 ◽  
Vol 33 (10) ◽  
pp. 1950081 ◽  
Author(s):  
Madeeha Riaz ◽  
Rehana Zia ◽  
Snudia Aslam ◽  
Alliya Qamar ◽  
Tousif Hussain ◽  
...  
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Combustion Method ◽  
Calcium Nitrate Tetrahydrate ◽  
In Vitro Bioactivity ◽  
Nitrate Tetrahydrate ◽  
Gel Combustion ◽  
Gel Combustion Method

In this paper, low temperature, economical sol–gel combustion method was adopted to synthesize wollastonite ceramic. Calcium nitrate tetrahydrate and tetraethyl orthosilicate were taken as source for Ca and Si, while citric acid and nitric acid were used as chelating/combustion agents. The yielded powder calcined at 600[Formula: see text]C for 4 h was characterized by FTIR, XRD and SEM techniques. Results showed that the citrate combustion method was the most efficient method to prepare wollastonite at low temperature. Moreover, in vitro bioactivity test performed in simulated body fluid (SBF) showed good bioactivity of synthesized wollastonite ceramics.

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