Synthesis, Characterization and Bioactivity of Chitosan Hydroxyapatite Composite Doped with Strontium

Chitosan-hydroxyapatite composite doped with strontium was synthesised via in situ co-precipitation method. Physicochemical properties of the composite obtained were analysed using X-ray diffraction (XRD), infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and Thermogravimetry with differential thermal analysis (DT-TGA). The synthesized composite was subjected to bioactivity studies in simulated body fluid (SBF). The calcium release from the sample in SBF was measured using atomic absorption spectroscopy (AAS). The physicochemical properties and bioactivity of the novel composite was compared with that of hydroxyapatite, strontium doped hydroxyapatite and chitosan hydroxyapatite. The in vitro bioactivity studies of the novel composite showed that it has a higher release of Ca2+ in the SBF compared to the other samples. The novel material was also found to induce more Ca2+ deposition after 28 days of immersion in the SBF. Hence, the novel composite material has the potential to be used as biomaterials for clinical application.

Spinel Structured Iron Gallium Oxynitride - Fe2GaO2N2

10.4028/www.scientific.net/amr.1160.45 ◽

2021 ◽

Vol 1160 ◽

pp. 45-50

Author(s):

Savitha Kadencheri Unnikrishnan

Keyword(s):

Magnetic Properties ◽

Chemical Composition ◽

Spinel Structure ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

R Factor ◽

Novel Material ◽

Optical And Magnetic Properties ◽

A facile method was successfully developed to prepare Ternary oxynitride of iron and gallium. Initially mixed oxyhydroxides of Iron and gallium were prepared by co-precipitation method. Then this was nitrided using urea and agar in presence of ammonia at 900°C, which gave mixed cation oxynitride . This mixed oxynitride was characterized using XRD, XPS and SEM. The X-ray diffraction pattern of the Fex’GaxOyNz phase was refined within the cubic spinel structure (space group Fd-3m), using the fullprof program. On assuming 3+ oxidation state for half of iron and whole of gallium, the chemical composition of the oxynitride spinel determined by the X-ray analysis is Fe2GaN2O2. The refinement using these parameters resulted in a good fit to the observed diffraction data, with a crystallographic R factor of 5.92. This ternary oxynitride of iron and gallium is a novel material which can give unique optical and magnetic properties.

Loading of siRNA on Magnetic PLL-Fe2O3@SiO2 Nanocomposites and their Transfection In Vitro

10.4028/www.scientific.net/amr.1053.444 ◽

2014 ◽

Vol 1053 ◽

pp. 444-449

Author(s):

Xue Wen Cui ◽

Gang Cheng ◽

Rui Jiang Liu ◽

Li Wei Wang ◽

Yan Shuai Wang

Keyword(s):

Electron Microscope ◽

Precipitation Method ◽

Blue Staining ◽

X Ray Diffraction ◽

X Ray ◽

Sd Rat ◽

Gene Carriers ◽

Transmission Electron ◽

The magnetic Fe2O3 nanoparticles were prepared by co-precipitation method with FeCl3 and NaOH as starting reagents. The surface of Fe2O3 nanoparticles was modified with tetraethyl orthosilicate. Fe2O3@SiO2 nanocomposites were calcined at 600 °C. The nanocomposites were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). The PLL-Fe2O3@SiO2 (SMNP) was prepared by modifying with poly-L-lysine on the surface. The SMNP combined with plasmid siRNA by static electrical charges as one of gene carriers was transfected into SD rat neurons. The results of fluorescence microscope and Prussian blue staining show that SMNP can effectively enter cells. Therefore, SMNP are one kind of novel and effective gene carriers, it can transfect the plasmid which carries the siRNA into SD rats neurons in vitro.

Photoluminescent Properties of Hydroxyapatite and Hydroxyapatite/Multi-Walled Carbon Nanotube Composites

Crystals ◽

10.3390/cryst11070832 ◽

2021 ◽

Vol 11 (7) ◽

pp. 832

Author(s):

Edna X. Figueroa-Rosales ◽

Javier Martínez-Juárez ◽

Esmeralda García-Díaz ◽

Daniel Hernández-Cruz ◽

Sergio A. Sabinas-Hernández ◽

...

Keyword(s):

Carbon Nanotube ◽

Hexagonal Phase ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Multi Walled Carbon Nanotube ◽

Nanotube Composites ◽

Carbon Nanotube Composites ◽

Co Precipitation ◽

Functionalized Mwcnts

Hydroxyapatite (HAp) and hydroxyapatite/multi-walled carbon nanotube (MWCNT) composites were obtained by the co-precipitation method, followed by ultrasound-assisted and microwave radiation and thermal treatment at 250 °C. X-ray diffraction (XRD) confirmed the presence of a hexagonal phase in all the samples, while Fourier-transform infrared (FTIR) spectroscopy elucidated the interaction between HAp and MWCNTs. The photoluminescent technique revealed that HAp and the composite with non-functionalized MWCNTs present a blue luminescence, while the composite with functionalized MWCNTs, under UV-vis radiation shows an intense white emission. These findings allowed presentation of a proposal for the use of HAp and HAp with functionalized MWCNTs as potential materials for optoelectronic and medical applications.

Photocatalytic Activity of Fe-Doped ZnO/Montmorillonite Nanocomposite for Degradation of Malachite Green

Materials Science Forum ◽

10.4028/www.scientific.net/msf.827.19 ◽

2015 ◽

Vol 827 ◽

pp. 19-24 ◽

Cited By ~ 4

Author(s):

Nur Afifah ◽

Nadia Febiana Djaja ◽

Rosari Saleh

Keyword(s):

Photocatalytic Activity ◽

Malachite Green ◽

Organic Dyes ◽

Uv Light ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Spin Resonance ◽

Doped Zno ◽

In this study, the photocatalytic activity of pure Fe- doped ZnO and Fe- doped ZnO/Montmorillonite nanocomposite has been investigated for the degradation of malachite green under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, Fourier-transform infrared absorption, and electron spin resonance. The results showed that the photocatalytic efficiency is better in the presence of montmorillonite compared to pure Fe- doped ZnO. To detect the possible reactive species involved in degradation of organic dyes control experiments with introducing scavengers into the solution of organic dyes were carried out. It is found that electron plays an important role in the degradation of malachite green.

Template Induced Synthesis of Nano-Hydroxyapatite by Co-Precipitation Method

10.4028/www.scientific.net/amr.311-313.1713 ◽

2011 ◽

Vol 311-313 ◽

pp. 1713-1716 ◽

Cited By ~ 1

Author(s):

Yan Rong Sun ◽

Tao Fan ◽

Chang An Wang ◽

Li Guo Ma ◽

Feng Liu

Keyword(s):

Electron Microscope ◽

Chondroitin Sulfate ◽

Aspartic Acid ◽

Transmission Electron Microscope ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Structure And Morphology ◽

Transmission Electron ◽

Nano-hydroxyapatite with different morphology was synthesized by the co-precipitation method coupled with biomineralization using Ca(NO3)2•4H2O and (NH4)2HPO4 as reagents, adding chondroitin sulfate, agarose and aspartic acid as template. The structure and morphology of the prepared powders were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM).

Synthesis of Silica Modified Large-Sized Hydroxyapatite Whiskers by a Hydrothermal Co-Precipitation Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.645-646.1339 ◽

2015 ◽

Vol 645-646 ◽

pp. 1339-1344 ◽

Cited By ~ 1

Author(s):

Yan Ting Yin ◽

Qing Hua Chen ◽

Ting Ting Yan ◽

Qing Hua Chen

Keyword(s):

Bone Repair ◽

Ethanol Solution ◽

Morphological Properties ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

New Type ◽

Ft Ir ◽

Co Precipitation ◽

Surface Modified

The objective of this study was to develop a novel silica modified large-sized hydroxyapatite whiskers with improved properties for use in bone repair applications. Large-sized whiskers with a mean length of 250μm were obtained by a hydrothermal co-precipitation method at 150°C, 7.5Mpa in high-pressure reactor. Silica modified hydroxyapatite whiskers were prepared by dissolving TEOS in ethanol solution, then sintering with hydroxyapatite. The compositional and morphological properties of prepared whiskers were studied by means of x-ray diffraction (XRD), Fouier transform infrared (FT-IR), scanning electron microscopy (SEM). The results indicated the evidence of nanosilicon dioxide particles on the surface of HAP whiskers. The size of nanosilicon dioxide particles depends on dropping and stirring rate. Hence, this new type of silica modified large-sized hydroxyapatite whiskers is a valuable candidate for biomedical applications.Key words: hydroxyapatite, hydrothermal co-precipitation, surface modified, whiskers

Nitrogen and Bromide Co-Doped Hydroxyapatite Thin Films with Antimicrobial Properties

Coatings ◽

10.3390/coatings11121505 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1505

Author(s):

Simona Liliana Iconaru ◽

Carmen Steluta Ciobanu ◽

Daniela Predoi ◽

Mikael Motelica-Heino ◽

Constantin Cătălin Negrilă ◽

...

Keyword(s):

Thin Films ◽

Antimicrobial Activity ◽

Spin Coating ◽

Thin Layers ◽

Precipitation Method ◽

X Ray ◽

Co Precipitation ◽

First Time ◽

Co Doped

Hydroxyapatite (Ca10(PO4)6(OH)2, HAp), due to its high biocompatibility, is widely used as biomaterial. Doping with various ions of hydroxyapatite is performed to acquire properties as close as possible to the biological apatite present in bones and teeth. In this research the results of a study performed on thin films of hydroxyapatite co-doped with nitrogen and bromine (NBrHAp) are presented for the first time. The NBrHAp suspension was obtained by performing the adapted co-precipitation method using cetyltrimethylammonium bromide (CTAB). The thin layers of NBrHAp were obtained by spin-coating. The stability of the NBrHAp suspension was examined by ultrasound measurements. The thin layers obtained by the spin-coating method were examined by scanning electron microscopy (SEM), optical microscopy (OM), and metallographic microscopy (MM). The presence of nitrogen and bromine were highlighted by energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) studies. Fourier transform infrared spectroscopy (FTIR) was used to highlight the chemical status of nitrogen and bromine. In addition, the powder obtained from the NBrHAp suspension was analyzed by XRD. Moreover, the in vitro antimicrobial activity of the NBrHAp suspensions and coatings was investigated using the reference microbial strains Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 25922, and Candida albicans ATCC 10231. The results highlighted the successful obtainment of N and Br co-doped hydroxyapatite suspension for the first time by an adapted co-precipitation method. The obtained suspension was used to produce pure NBrHAp composite thin films with superior morphological properties. The NBrHAp suspensions and coatings exhibited in vitro antimicrobial activity against bacterial and fungal strains and revealed their good antimicrobial activity.

The Effect of Polyvinyl Alcohol Concentration on the Growth Kinetics of KTiOPO4 Nanoparticles Synthesized by the Co-precipitation Method

HighTech and Innovation Journal ◽

10.28991/hij-2020-01-04-06 ◽

2020 ◽

Vol 1 (4) ◽

pp. 187-193

Author(s):

Elaheh Gharibshahian

Keyword(s):

Polyvinyl Alcohol ◽

Shape Control ◽

Second Harmonic ◽

Precipitation Method ◽

Capping Agent ◽

X Ray Diffraction ◽

X Ray ◽

Size And Shape ◽

Diffraction Patterns ◽

KTiOPO4 nanoparticles are known as the best candidate to utilize for second-harmonic generation in multiphoton microscopes and bio labels. Size and shape are important and effective parameters to control the properties of nanoparticles. In this paper, we will investigate the role of capping agent concentration on the size and shape control of KTP nanoparticles. We synthesized KTP nanoparticles by the co-precipitation method. Polyvinyl alcohol with different mole ratios to titanium ion (1:3, 1:2, 1:1) was used as a capping agent. Products were examined by X-ray diffraction patterns and scanning electron microscopy analyses. X-ray diffraction patterns confirmed the formation of the KTP structure. The biggest (56.36nm) and smallest (39.42nm) grain size were obtained by 1:3 and 1:1 mole ratios of capping agent, respectively. Dumbly, spherical and polyhedral forms of KTP nanoparticles were observed by the change in capping agent mole ratio. The narrowest size distribution of KTiOPO4 nanoparticles was obtained at 1:1 mole ratio of capping agent. Doi: 10.28991/HIJ-2020-01-04-06 Full Text: PDF

Synthesis of Magnetic Modified Organobentonite as Adsorbent for Degradation of Orange II

10.4028/www.scientific.net/amr.838-841.2306 ◽

2013 ◽

Vol 838-841 ◽

pp. 2306-2309

Author(s):

Guang Hua Wang ◽

Kun Chen ◽

Wen Bing Li ◽

Dong Wan ◽

Qin Hu ◽

...

Keyword(s):

Magnetic Field ◽

Reaction Medium ◽

Precipitation Method ◽

Basal Spacing ◽

Orange Ii ◽

X Ray Diffraction ◽

X Ray ◽

Ft Ir ◽

Co Precipitation ◽

Scanning Electron

Magnetic modified organobentonite (Fe3O4/CTAB–Bent) was synthesized by chemical co-precipitation method in which CTAB–Bent was firstly achieved via ion–exchange.The composite materials have been characterized by powder X–ray diffraction (XRD), Fourier transform infrared spectroscopy (FT–IR) and Scanning electron microscopy (SEM) . The results revealed that basal spacing of bentonite was increased through organic modification and the Fe3O4 particles synthesized which covering the surfaces of bentonite .Compared with natural bentonite, the adsorption capacity of Fe3O4/CTAB–Bent for Orange II was greatly enhanced and can be easily separated from the reaction medium by an external magnetic field after the treatment.

Preparation and Electrochemical Performance of Mn3O4/GR Composites Electrode Material in Supercapacitors

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.807.50 ◽

2019 ◽

Vol 807 ◽

pp. 50-56

Author(s):

Yun Long Zhou ◽

Zhi Biao Hu ◽

Li Mei Wu ◽

Jiao Hao Wu

Keyword(s):

Room Temperature ◽

Raw Materials ◽

Precipitation Method ◽

Electrochemical Performances ◽

Manganese Sulfate ◽

X Ray Diffraction ◽

X Ray ◽

Co Precipitation ◽

A Current ◽

Discharge Test

Using hydrated manganese sulfate and general type graphene (GR) as raw materials, Mn3O4/GR composite has been successfully prepared by the liquid phase chemical co-precipitation method at room temperature. X-ray diffraction (XRD) was used to investigate the phase structure of Mn3O4powder and Mn3O4/GR composite; The electrochemical performances of the samples were elucidated by cyclic voltammetry and galvanostatic charge-discharge test in 0.5 mol/L Na2SO4electrolyte. The results show that the Mn3O4/GR composite possesses graphene phase and good reversibility; the composite also displays a specific capacitance of 318.8 F/g at a current density of 1 A/g.