Crystal structure, optical and magnetic properties of PrFeO3 nanoparticles prepared by modified co-precipitation method

In this work, PrFeO3 nanoparticles were synthesized by modified co-precipitation method and annealed at different temperatures up to 850?C. The annealed PrFeO3 nanoparticles have single phase orthorhombic structure and the average particle size of 25-30 nm. Due to the very small particle size the prepared PrFeO3 nanoparticles are capable of being used as photocatalyst materials thanks to their strong adsorption bands at 230-400 nm and 400-800 nm observed from the UV-Vis spectra. Additionally, the PrFeO3 nanoparticles are paramagnetic materials with Hc ~ 10Oe and Mr ~ 0. These findings demonstrate their potential use not only as photocatalysts, but also as magnetic materials.

Download Full-text

Chemical Synthesis and Characterization of Bismuth Vanadate Powder

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.93-94.153 ◽

2010 ◽

Vol 93-94 ◽

pp. 153-156 ◽

Cited By ~ 2

Author(s):

Pusit Pookmanee ◽

Sumintra Paosorn ◽

Sukon Phanichphant

Keyword(s):

Particle Size ◽

Single Phase ◽

Average Particle Size ◽

Ammonium Hydroxide ◽

Bismuth Vanadate ◽

Precipitation Method ◽

Average Particle ◽

X Ray Diffraction ◽

Co Precipitation

Bismuth vanadate powder was synthesized by a chemical co-precipitation method. Bismuth nitrate and ammonium vanadate were used as the starting precursors. The yellow precipitated powder was formed after adding ammonium hydroxide until the pH of final solution was 7. The powder was filtered and dried at 60 °C for 24h and calcined at 200-400 °C for 2h. The phase of bismuth vanadate powder was studied by X-ray diffraction (XRD). A single phase of monoclinic structure was obtained after calcinations at 200-400 °C for 2h. The morphology and particle size of bismuth vanadate powder were investigated by scanning electron microscopy (SEM). The particle was irregular in shape and highly agglomerated with an average particle size of 0.5 µm in width and 1.5 µm in length.

Download Full-text

Morphology-Controlled CaCO3 Nanostructures by Modified Co-Precipitation in Pulsed Mode

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.752-753.148 ◽

2015 ◽

Vol 752-753 ◽

pp. 148-153

Author(s):

M.M. Nassar ◽

Taha Ebrahiem Farrag ◽

M.S. Mahmoud ◽

Sayed Abdelmonem

Keyword(s):

Particle Size ◽

Calcium Carbonate ◽

Rotation Speed ◽

Average Particle Size ◽

Calcium Nitrate ◽

Precipitation Method ◽

Average Particle ◽

X Ray ◽

Co Precipitation ◽

Pulsed Mixing

Calcium carbonate nanoparticles and nanorods were synthesized by precipitation from saturated sodium carbonate and calcium nitrate aqueous solutions through co precipitation method. A new rout of synthesis was done by both using pulsed mixing method and controlling the addition of calcium nitrate. The effect of the agitation speed, and the temperature on particle size and morphology were investigated. Particles were characterized using X-ray Microanalysis, X-ray analysis (XRD) and scanning electron microscopy (SEM). The results indicated that increasing the mixer rotation speed from 3425 to 15900 (rpm) decreases the average particle size to 64±7 nm. A rapid nucleation then aggregation induced by excessive shear force phenomena could explain this observation. Moreover, by increasing the reaction temperature, the products were converted from nanoparticle to nanorods. The maximum attainable aspect ratio was 6.23 at temperature of 75°C and rotation speed of 3425. Generally, temperature raise promoted a significant homoepitaxial growth in one direction toward the formation of calcite nanorods. Overall, this study can open new avenues to control the morphology of the calcium carbonate nanostructures.

Download Full-text

Effect of Surfactant on the Preparation of Nano-powder for Yb Doping Laser Transparent YAG Ceramic

High Temperature Materials and Processes ◽

10.1515/htmp-2012-0168 ◽

2013 ◽

Vol 32 (5) ◽

pp. 511-515 ◽

Cited By ~ 1

Author(s):

Xiao Guo Cao ◽

Jia Wang ◽

Qi Bai Wu ◽

Hai Yan Zhang

Keyword(s):

Particle Size ◽

Polyethylene Glycol ◽

Average Particle Size ◽

Ammonium Bicarbonate ◽

Spherical Particles ◽

Precipitation Method ◽

Average Particle ◽

X Ray Diffraction ◽

Nano Powder ◽

Co Precipitation

AbstractYb:YAG transparent ceramic nano-powder was prepared by chemical co-precipitation method, with ammonium bicarbonate as the precipitant and polyethylene glycol as surfactant. The addition of polyethylene glycol can reduce the agglomeration and particle size of the prepared Yb:YAG powder. The morphology, thermal stability and phase structure of Yb:YAG nano-powder were charactered by scanning electron microscopy (SEM), thermogravimetry and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy. The results show that well-crystallized nano-powder was obtained by calcining the precursors at 900 °C for 3 h. The average particle size of Yb:YAG powder is about 100–200 nm. When the volume amount of polyethylene glycol is 2.0%, well-dispersed Yb:YAG powder with spherical particles of 100 nm diameter was obtained.

Download Full-text

Exploring the interaction of l-cysteine capped CuS nanoparticles with bovine serum albumin (BSA): a spectroscopic study

RSC Advances ◽

10.1039/c6ra03583c ◽

2016 ◽

Vol 6 (63) ◽

pp. 58288-58295 ◽

Cited By ~ 32

Author(s):

S. Prasanth ◽

D. Rithesh Raj ◽

T. V. Vineeshkumar ◽

Riju K. Thomas ◽

C. Sudarsanakumar

Keyword(s):

Particle Size ◽

Bovine Serum Albumin ◽

Serum Albumin ◽

Bovine Serum ◽

Copper Sulfide ◽

Average Particle Size ◽

Precipitation Method ◽

Average Particle ◽

Spectroscopic Techniques ◽

Co Precipitation

l-Cysteine capped copper sulfide nanoparticles with an average particle size of 6 nm were synthesized using a chemical co-precipitation method and their interactions with bovine serum albumin were explored using various spectroscopic techniques.

Download Full-text

Preparation of Nanostructured Metal Ferrite Particles by Sonochemistry

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.277-279.1044 ◽

2005 ◽

Vol 277-279 ◽

pp. 1044-1048 ◽

Cited By ~ 2

Author(s):

Eun Hee Kim ◽

Hyo Sook Lee ◽

Hui Ping Shao

Keyword(s):

Magnetic Field ◽

Particle Size ◽

Cobalt Ferrite ◽

Average Particle Size ◽

Iron Chloride ◽

Precipitation Method ◽

Average Particle ◽

Sonochemical Method ◽

Iron Ferrite ◽

Co Precipitation

Nanostructured iron and cobalt ferrite particles were prepared from iron chloride and cobalt chloride, respectively, using the sonochemical method. The particles were compared with those synthesized using the co-precipitation method. The properties of the particles were characterized using various techniques, such as XRD, TEM, VSM and a SQUID magnetometer. The iron ferrite particles had an average particle size of about 15 nm and a magnetization value of 83 emu/g at a magnetic field of 50 kOe, while the particle size of cobalt ferrite was about 5 nm and its magnetization value was 33 emu/g at the same magnetic field.

Download Full-text

Synthesis and Studying Induction Heating of Mn1-xZnxFe2O4 (x=0-0.5) Magnetic Nanoparticles for Hyperthermia Treatments

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.882.200 ◽

2021 ◽

Vol 882 ◽

pp. 200-218

Author(s):

S. Mahmood Hussein ◽

T.H. Mubarak ◽

S.M. Ali Ridha ◽

Jasim Al-Zanganawee

Keyword(s):

Particle Size ◽

Relaxation Time ◽

Magnetic Nanoparticles ◽

Smart Materials ◽

Average Particle Size ◽

Superparamagnetic Nanoparticles ◽

Soft Magnetic Materials ◽

Precipitation Method ◽

Average Particle ◽

Co Precipitation

The recent development of the using the magnetic nanoparticles for hyperthermia treatments emphasizes the needed of smart materials to become a safety for heat therapy. Self-regulate magnetic nanoparticles of MnZnFe2O4 may be proper for thermal treatments. Structure and magnetic properties of the synthesis Mn1-xZnx Fe2O4 with x=0- 0.5 by step 0.1were studied. Superparamagnetic nanoparticles of MnZnFe2O4 were prepared by co-precipitation method, followed that heat treatment in the autoclave reactor. XRD results showed that is difficult to prepare MnZnFe2O4 directly using the co-precipitation method. Preparation method yield nanoparticles with spherical shape and there is a slight change in the particle size distribution, also observed shrinkage occurs in the particle size after heat treatments, the average particle size was estimated about 20nm as confirmed by FESEM images. FTIR spectra of samples showed two distinct absorption peaks in the range ~ 617 – 426 (cm-1) related to stretching vibrations of the (Fe-O) in the tetrahedral and octahedral side respectively. Magnetic measurements were carried out using (VSM), M-H curves indicate typical soft magnetic materials and particles so small to be identical superparamagnetic nanoparticles. Heating ability of water based colloidal dispersions of samples were studied under magnetic field strength 6.5kA/m and the frequency 190 kHz, and the results showed when increasing Zn2+ to x=0.3 or more the samples not heated up. Depending on the heating curve susceptibility, effective relaxation time and Néel relaxation time , were determined.

Download Full-text

Synthesis and Properties of Superparamagnetic Fe3O4 Nanoparticles by Co-Precipitation Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.377.173 ◽

2013 ◽

Vol 377 ◽

pp. 173-179 ◽

Cited By ~ 2

Author(s):

Chan Yin ◽

Xiao Yi Wei ◽

Ji Hua Li ◽

Fei Wang

Keyword(s):

Particle Size ◽

Saturation Magnetization ◽

Single Phase ◽

Average Particle Size ◽

Particle Surface ◽

Anhydrous Ethanol ◽

Precipitation Process ◽

Average Particle ◽

Agglomeration Of Nanoparticles ◽

Co Precipitation

Superparamagnetic Fe3O4nanoparticle with single phase has been synthesized successfully by a co-precipitation process. On the other hand, the effect of additive anhydrous ethanol in synthesis procedure was investigated for the magnetic properties of nanoparticles in this paper. The structure properties of synthetic Fe3O4particle were measured through XRD, FT-IR and TG-DSC devices. The characteristic peaks of Fe3O4have been observed to testify Fe3O4with single phase. The particle size and shape were observed by SEM and TEM measurements. The addition of anhydrous ethanol could enhance the dispersion of Fe3O4nanoparticles and restrain the agglomeration of nanoparticles. Therefore, the average particle size was about 18.2 nm, smaller than that of Fe3O4particles prepared without anhydrous ethanol of 24.3 nm. Correspondingly, the saturation magnetization (Ms) of Fe3O4prepared with and without anhydrous ethanol was determined to be 53.28 emu/g and 65.28 emu/g, respectively, lower than bulk magnetite particles of 90 emu/g. That is because, synthetic Fe3O4with smaller particle size obtains the higher surface curvature, which could enhance the disordered crystal orientation on the particle surface, so the saturation magnetization was decreased.

Download Full-text

SYNTHESIS OF CdS NANOPARTICLES BY CHEMICAL Co-PRECIPITATION METHOD AND ITS COMPARATIVE ANALYSIS OF PARTICLE SIZE VIA STRUCTURAL AND OPTICAL CHARACTERIZATION

Indonesian Physical Review ◽

10.29303/ipr.v3i3.64 ◽

2020 ◽

Vol 3 (3) ◽

pp. 100

Author(s):

Syed Kaabir Ali ◽

Henna Wani ◽

Chandramani Upadhyay ◽

K.S.S.N. Sai Madhur ◽

Imran Khan ◽

...

Keyword(s):

Particle Size ◽

Lattice Strain ◽

Theoretical Calculations ◽

Average Particle Size ◽

Precipitation Method ◽

Cds Nanoparticles ◽

Deformation Model ◽

Average Particle ◽

Scherrer Equation ◽

Co Precipitation

CdS is an important wide bandgap chalcogenides most popularly studied for various optoelectronics and biosensing applications. In this study, CdS Nanoparticles (NPs) have been prepared successfully by chemical co-precipitation method, using cadmium acetate and sodium sulphide as precursors. A comparative study of average particle size calculated by Scherrer Plot, Uniform Deformation Model (UDM), Dynamic Light Scattering (DLS) analysis and Brus Model has been done here. The structural and optical behaviour of synthesized samples were investigated via X-ray diffraction (XRD), DLS and UV–Visible Spectroscopy. The XRD spectra of the prepared CdS NPs revealed the crystalline phase having cubic structure. The average particles size has been studied via Debye Scherrer equation and Scherrer Plot. For the theoretical calculations of particle size along with the induced lattice strain, considering the broadening effect of lattice strain, Williamson-Hall analysis was employed. Assuming the lattice strain to be isotropic in nature, UDM was applied for calculation. The particles size distribution profile in terms of volume as well as intensity was recorded using DLS analysis in ethanol medium at room temperature. Besides this, the energy bandgap was obtained by applying Tauc model in the recorded absorption spectra. The obtained value of bandgap was used in Brus model for estimating the average particle size. The obtained comparative results show that the average particle size of the prepared CdS NPs estimated from Scherrer equation, Scherrer plot, UDM plot and Brus model are almost similar and lies in the range of 2-5 nm whereas the results of DLS showed wide variation in the range of 40-600 nm.

Download Full-text

Preparation and characterization of domperidone nanoparticles for dissolution improvement

Iraqi Journal of Pharmaceutical Sciences ( P-ISSN 1683 - 3597 E-ISSN 2521 - 3512) ◽

10.31351/vol27iss1pp39-52 ◽

2018 ◽

Vol 27 (1) ◽

pp. 39-52

Author(s):

Mohammed Sabar Al-lami ◽

Malath H. Oudah ◽

Firas A. Rahi

Keyword(s):

Particle Size ◽

Average Particle Size ◽

In Vitro Release ◽

Methyl Cellulose ◽

Precipitation Method ◽

Average Particle ◽

Antisolvent Precipitation ◽

Stirring Time

This study was carried out to prepare and characterize domperidone nanoparticles to enhance solubility and the release rate. Domperidone is practically insoluble in water and has low and an erratic bioavailability range from 13%-17%. The domperidone nanoparticles were prepared by solvent/antisolvent precipitation method at different polymer:drug ratios of 1:1 and 2:1 using different polymers and grades of poly vinyl pyrolidone, hydroxy propyl methyl cellulose and sodium carboxymethyl cellulose as stabilizers. The effect of polymer type, ratio of polymer:drug, solvent:antisolvent ratio, stirring rate and stirring time on the particle size, were investigated and found to have a significant (p? 0.05) effect on particle size. The best formula was obtained with lowest average particle size of 84.05. This formula was studied for compatibility by FTIR and DSC, surface morphology by FESEM and crystalline state by XRPD. Then domperidone nanoparticles were formulated into a simple capsule dosage form in order to study of the in vitro release of drug from nanoparticles in comparison raw drug and mixture of polymer:drug ratios of 2:1. The release of domperidone from best formula was highly improved with a significant (p? 0.05) increase.

Download Full-text

Synthesis of Nanostructured Magnetic Mixed-Oxide Ferrite Powders by Using A Novel Chemical Method

MRS Proceedings ◽

10.1557/proc-720-h3.3 ◽

2002 ◽

Vol 720 ◽

Author(s):

N N Ghosh

Keyword(s):

Particle Size ◽

Mixed Oxide ◽

Chemical Method ◽

Average Particle Size ◽

Cost Effective ◽

Water Soluble ◽

Average Particle ◽

Chemical Route ◽

Water Soluble Polymer ◽

Different Temperatures

AbstractIn the present investigation, an attempt has been made to establish a new chemical route for synthesis of the nanostructured mixed oxide ferrite powders. By using this chemical method a variety of ferrite powders having spinel structure and doped with Co, Ni, Mn, Zn etc has been prepared. In this method nitrate salts of the different metals were used as starting materials. The aqueous solutions of the metal nitrates were mixed according to the molar ration of the compositions. Then the mixtures were mixed with an aqueous solution of water soluble polymer (polyvinyl alcohol). This mixture after drying yield fluffy brown powders. These powders were then calcined at different temperatures ranging from 400 °C to 700 °C. Nanostructured powders were obtained from the thermal decomposition of the brown powders. The powders, prepared by calcinations at different temperatures, were characterized by using X-Ray diffraction analysis, IR spectroscopy, TGA/DTA, and TEM. It was observed that the average particle size of the powders are in nanometer scale with a narrow size distribution. The average particle size of the powders was increased with the increase of calcinations temperature.This chemical method has proved to provide a convenient process for the preparation of nanostructured ceramic powders at comparatively low temperatures and offers the potential of being a simple and cost-effective route.

Download Full-text