scholarly journals Characterization of Cu and Ni Nano-Fluids Synthesized by Pulsed Wire Evaporation Method

2017 ◽  
Vol 62 (2) ◽  
pp. 999-1004 ◽  
Author(s):  
Hyo-Seob Kim ◽  
Fikret Yilmaz ◽  
Peyala Dharmaiah ◽  
Dong-Jin Lee ◽  
Tae-Haeng Lee ◽  
...  
Keyword(s):  
Particle Size ◽  
Ethylene Glycol ◽  
Aqueous Media ◽  
Average Particle Size ◽  
Nano Particles ◽  
Dispersion Stability ◽  
Suspension Stability ◽  
Average Particle ◽  
Dispersion State ◽  
Size And Morphology

AbstractIn the present work, Cu and Ni nanofluids were synthesized using the pulsed wire evaporation (PWE) method in the different aqueous medias, namely (ethanol and ethylene glycol), and the effects of the aqueous media on the dispersion state, stability, and particle size of nanoparticles were studied. The size and morphology of synthesized nano-particles were investigated by transmission electron microscopy (TEM). Also, the dispersion stability of the nanofluids was evaluated by turbiscan analysis. The TEM results showed that the nano-particles were spherical in shape, and the average particle size was below 100 nm. The average particle size of the Cu nano-particles was smaller than that of Ni, which was attributed to a difference in the specific sublimation energy of the elements. Moreover, ethylene glycol (EG) exhibited higher suspension stability than ethanol. Finally, the dispersion stability of Cu@EG displayed the highest value due to lower particle size and greater viscosity.

Morphology and Particle Size of Di(ethylene glycol) Mediated Metallic Copper Nanoparticles

2008 ◽  
Vol 8 (7) ◽  
pp. 3516-3525 ◽  
Author(s):  
Alojz Anžlovar ◽  
Zorica Crnjak Orel ◽  
Majda Žigon
Keyword(s):  
Particle Size ◽  
Ethylene Glycol ◽  
Metallic Copper ◽  
Average Particle Size ◽  
Reduction Reaction ◽  
Average Particle ◽  
Cu Nanoparticles ◽  
Starting Compound ◽  
Low Concentrations ◽  
Size And Morphology

Cu nanoparticles were prepared in di(ethylene glycol) by a reduction reaction of Cu (II) acetate precursor to metallic Cu. The size and morphology of the synthesized particles were studied in dependence of the concentration of the starting compound and the temperature conditions of reaction were varied to determine the correlation with the size and morphology of the synthesized particles. The morphology and size of the resulting copper (I) oxide as an intermediate product and metallic Cu particles as a final product are strongly dependent on the concentration of the starting compound, thus indicating differences in the mechanism of the reduction reaction and, consequently, the mechanism of particle formation. At low concentrations (0.01 and 0.1 mol/L), an organo-metallic copper complex intermediate forms crystalline 10–100 nm thick and up to 10 μm long nanowires organized in dendritic spheres with a diameter of 5–50 μm, which further transform into Cu2O. Cu-di(ethylene glycolate) complex has an as yet undescribed crystalline structure. At a high precursor concentration (1 mol/L), the intermediate forms partly amorphous and partly crystalline Cu2O. The reduction of Cu2O to metallic Cu takes place between 190–200 °C. The smallest average particle size (100 nm) and the narrowest particle size distribution was obtained at a Cu (II) acetate concentration of 0.1 mol/L.

scholarly journals Effect of Nanosized Colloidal Copper on Cotton Fabric

2010 ◽  
Vol 5 (3) ◽  
pp. 155892501000500 ◽  
Author(s):  
D.P. Chattopadhyay ◽  
B.H. Patel
Keyword(s):  
Particle Size ◽  
Cotton Fabric ◽  
Colloidal Solution ◽  
Chemical Reduction ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Nano Particles ◽  
Size Analysis ◽  
Average Particle ◽  
Sem Images

This research deals with the synthesis of nanosized copper as colloidal solution and its application to cotton fabric. Copper nano colloids were prepared by chemical reduction of copper salt using sodium borohydride as reducing agent in presence of tri-sodium citrate. The size and size distribution of the particles were examined by particle size analyzer and the morphology of the synthesized particles was examined by SEM and AFM techniques. X-ray fluorescence spectroscopy detected the presence of copper in the treated fabric. The results of particle size analysis showed that the average particle size varied from 60 nm to 100 nm. The nano copper treated cotton was subjected to soil burial test for the assessment of its resistance towards microbial attack. SEM images of treated fabric indicate copper nano particles are well dispersed on the surface of the specimens. The treatments of nano copper colloidal solution on cotton not only improve its antimicrobial efficiency but also influenced the tensile strength of the fabric sample positively. The treatment was found to enhance the color depth and fastness properties of direct dyed cotton fabric samples.

Molten Salt Synthesis of CaCu3Ti4O12

2008 ◽  
Vol 368-372 ◽  
pp. 115-117 ◽  
Author(s):  
Ke Pi Chen ◽  
Yong He ◽  
Dong Yu Liu ◽  
Zong De Liu
Keyword(s):  
Particle Size ◽  
Molten Salt ◽  
Average Particle Size ◽  
Particle Morphology ◽  
Holding Time ◽  
Molten Salt Synthesis ◽  
Average Particle ◽  
Molten Salt Method ◽  
Particle Size Analyzer ◽  
Size And Morphology

CCTO powders were prepared by using molten salt method in the NaCl-KCl system. The effects of temperature and holding time on phase compositions, particle morphology and size have been investigated by X-ray diffraction, scanning electron microscope and laser particle size analyzer. Using CaCO3, CuO and TiO2 as starting materials, CCTO compound could be synthesized at any temperature from 800oC to 1000oC in the NaCl-KCl system. The average particle size increased obviously with the increasing of temperature above 850 oC. Holding time had great effect on grain size and morphology.

scholarly journals Monodispersed ZnO Nanoparticles and Their Use in Heterojunction Solar Cell

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Dinesh Patidar ◽  
Anusaiya Kaswan ◽  
N. S. Saxena ◽  
Kananbala Sharma
Keyword(s):  
Particle Size ◽  
Solar Cell ◽  
Ethylene Glycol ◽  
Zno Nanoparticles ◽  
Ultrasonic Treatment ◽  
Room Temperature ◽  
Power Conversion ◽  
Average Particle Size ◽  
Hexagonal Wurtzite Structure ◽  
Average Particle

Monodispersed ZnO nanoparticles have been synthesised in ethylene glycol medium using zinc acetate and sodium hydroxide at room temperature through ultrasonic treatment. The monodispersed ZnO nanoparticles were characterized by XRD, TEM, SEM, and optical spectroscopy. The results indicate that ZnO shows the hexagonal wurtzite structure having 8 nm average particle size with the band gap of 3.93 eV. ZnO nanoparticles blended with P3HT show the improvement in the interchains and intrachains ordering as compared to pure P3HT. The power conversion efficiency of P3HT/ZnO solar cell is found to be 0.88%, which is comparable with the result obtained by other researchers.

Characterization of CeO2 Fine Particles Prepared by the Homogeneous Precipitation Method with a Mixed Solutionof Ethylene Glycol and Polyethylene Glycol

2004 ◽  
Vol 19 (4) ◽  
pp. 1087-1092 ◽  
Author(s):  
Naofumi Uekawa ◽  
Masayuki Ueta ◽  
Yong Jun Wu ◽  
Kazuyuki Kakegawa
Keyword(s):  
Particle Size ◽  
Polyethylene Glycol ◽  
Ethylene Glycol ◽  
Fine Particles ◽  
Average Particle Size ◽  
Weight Ratio ◽  
Cerium Nitrate ◽  
Precipitation Method ◽  
Average Particle ◽  
Nitrate Hydrate

Cerium oxide (CeO2) nanoparticles were obtained by heating a polyethylene glycol (PEG) solution of cerium nitrate hydrate [Ce(NO3)3 6H2O] at 383 K for 3 h. When the PEG, whose molecular weight was 20,000, was used for the preparation, the monodispersed CeO2, whose particle size was about 102 nm, was obtained. When the mixture of PEG20,000 and ethylene glycol (EG) was used to prepare the PEG solution of cerium nitrate hydrate, the average particle size increased from 102 nm to 660 nm with an increase in the EG content of the solution. The pore structure in the obtained CeO2 particles also depended on the weight ratio between EG and PEG20,000.

Preparation of Ag Nanoparticles by Particulate Radiation of Pulsed Electron Beam

2011 ◽  
Vol 287-290 ◽  
pp. 338-342
Author(s):  
Young Rang Uhm ◽  
Chang Kyu Rhee ◽  
Sergei Sokovnin ◽  
M.E Balezin
Keyword(s):  
Particle Size ◽  
Electron Beam ◽  
Ethylene Glycol ◽  
Ag Nanoparticles ◽  
Irradiation Time ◽  
Average Particle Size ◽  
Pulse Electron Beam ◽  
Average Particle ◽  
Beam Irradiation ◽  
Pulsed Electron Beam

Nano metal Ag nanoparticles were synthesized by pulse electron beam (e-beam) irradiation at room temperature and the atmospheric pressure. The staring materials were AgNO3, toluene, ethanol and ethylene glycol. The ethanol and ethylene glycol plays a role of prohibiting agglomeration of metal ions. Energy dispersive X-ray spectrometer (EDX) was used to characterize the elements. Transmission electron microscopy (TEM) images were used to determine the shape and diameter. The time of e-beam irradiation affect to the particle size and aggregation. The average particle size was 10 nm and 30 nm for the dose time of 1 and 5 min, respectively. The shape of particles were changed from spherical to disk-like to coral-like, with increasing the irradiation time from 1 to 5 to 10 min.

Effect of Poly(Vinyl Pyrrolidone) on Dispersing Carbon Black Particles

2013 ◽  
Vol 796 ◽  
pp. 432-436
Author(s):  
Xia Yuan
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Carbon Black ◽  
Ultrasonic Method ◽  
Aqueous Media ◽  
Average Particle Size ◽  
Sodium Dodecyl ◽  
Vinyl Pyrrolidone ◽  
Average Particle ◽  
Poly Vinyl Pyrrolidone

The effects of poly (vinyl pyrrolidone)(PVP) on dispersing carbon black (CB) particles were investigated by measuring Z-average particle size, Zeta potential and centrifugal stability of CB dispersions. Addition of PVP in a dispersing medium significantly reduces the size of suspended CB particles, especially in water. The dispersing efficiency of PVP was found to have been enhanced by adding an anionic surfactant, sodium methylenedinaphthalene disulphonate (NNO) in the aqueous media. The particle size of CB dispersed with PVP and NNO was 175.7 nm, significantly smaller than that dispersed with PVP and sodium dodecyl sulfate (SDS). The performance of PVP-encapsulated CB particles and that of PVP-adsorbed CB particles were also compared. The particle size and Zeta potential of PVP-encapsulated CB particles were similar to those of PVP-adsorbed CB particles using ultrasonic method, but the centrifugal stability of PVP-encapsulated CB dispersions was significantly improved. The relative absorbency of PVP/CB dispersions was increased from 42.0% to 63.7%. However, the PVP-encapsulated layer can be destroyed by prolonged ultrasonic treatment because the ultrasound over a long period of time can not only break up the flocculation bridge in the crosslinking matrix of PVP, but also flake off the PVP shells on the surface of CB particles.

scholarly journals Tennis Rehabilitation Training-Assisted Paclitaxel Nanoparticles in Treatment of Lung Tumor

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Di Hu ◽  
YiMin Yang
Keyword(s):  
Particle Size ◽  
Treatment Group ◽  
Lung Tumor ◽  
Average Particle Size ◽  
Tumor Development ◽  
Lung Tumors ◽  
High Dose ◽  
Average Particle ◽  
Rehabilitation Training ◽  
Size And Morphology

Paclitaxel nanoparticles are a compound with unique anticancer effects. Its mechanism of action is to prevent tumor rupture by stabilizing tumor proteins, while preventing cell division, leading to cell death, thereby inhibiting the spread of lung tumors. This article aims to study the treatment of lung tumors with paclitaxel nanoparticles assisted by tennis rehabilitation training. In this paper, paclitaxel nanoparticles were prepared by a solvent displacement method, and their particle size and morphology were measured. The TA2 series of experimental rats were selected to establish animal lung tumor models, and they were randomly divided into 5 groups: local injection of saline, porphyrin, and low-, medium-, and high-dose paclitaxel nanoparticles for treatment. The experimental results in this paper show that the average particle size of the paclitaxel nanoparticles prepared in the experiment is about 153,54 nm. Each treatment group inhibited tumor development to varying degrees. Among them, the inhibitory volume rate of paclitaxel nanoparticles in the middle- and high-dose groups was significantly higher than that in the paclitaxel treatment group, indicating that paclitaxel nanoparticles can release drugs slowly.

Effects of MgO Nano Particles on Microstructural and Mechanical Properties of Aluminum Matrix Composite prepared via Powder Metallurgy Route

2012 ◽  
Vol 05 ◽  
pp. 607-614 ◽  
Author(s):  
Mohammad Amin Baghchesara ◽  
Hossein Abdizadeh ◽  
Hamid Reza Baharvandi
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Powder Metallurgy ◽  
Volume Fraction ◽  
Average Particle Size ◽  
Aluminum Matrix ◽  
Nano Particles ◽  
Aluminum Matrix Composites ◽  
Average Particle ◽  
Powder Metallurgy Method

The objective of the present investigation was to evaluate the microstructural and mechanical properties of Al /nano MgO composite prepared via powder metallurgy method. Pure atomized aluminum powder with an average particle size of 1μm and MgO particulate with an average particle size between 60 to 80 nm were used. Composites containing 1.5, 2.5 and 5 percent of volume fraction of MgO were prepared by powder metallurgy method. The specimens were pressed by Cold Isostatic Press machine (CIP), subsequently were sintered at 575, 600 and 625°C. After sintering and preparing the samples, mechanical properties were measured. The results of microstructure, compression and hardness tests indicated that addition of MgO particulates to aluminum matrix composites improves the mechanical properties.

scholarly journals Effect of the Dispersion State in Y5O4F7 Suspension on YOF Coating Deposited by Suspension Plasma Spray

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 831
Author(s):  
Seungjun Lee ◽  
Jaehoo Lee ◽  
Nongmoon Hwang
Keyword(s):  
Particle Size ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Zeta Potential ◽  
Average Particle Size ◽  
Average Particle ◽  
Electrophoretic Light Scattering ◽  
Electrosteric Stabilization ◽  
Dispersion State ◽  
Yttrium Oxyfluoride

The stable Y5O4F7 suspension for dense yttrium oxyfluoride (YOF) coating by suspension plasma spraying (SPS) was developed. Electrostatically and electrosterically stabilized aqueous Y5O4F7 suspensions were prepared and compared with a commercially available Y5O4F7 suspension without dispersant. The wettability and dispersibility of the Y5O4F7 suspensions were evaluated in terms of the zeta potential, average particle size, and size distribution with electrophoretic light scattering (ELS) and dynamic light scattering (DLS). The viscosity was measured and the sedimentation was tested to examine the fluidity and stability of the Y5O4F7 suspensions. When electrostatic (BYK-154) and electrosteric (BYK-199) dispersants were added to the Y5O4F7 suspension, the isoelectric point (IEP) of Y5O4F7 particles in the suspension shifted to lower pH. The zeta potential of both of electrostatically and electrosterically stabilized Y5O4F7 suspensions were higher than ±40 mV at pH of 8.6, respectively, which were much higher than of the Y5O4F7 suspension without dispersant. Meanwhile, the average particle size of the electrosterically stabilized Y5O4F7 suspension was much smaller than that of the electrostatically stabilized one. The electrosteric stabilization had a great effect on improving the wettability and dispersibility of the Y5O4F7 suspension. The coating rate of the electrosterically stabilized Y5O4F7 suspension was the highest among the three tested suspensions. In addition, the YOF coating deposited with the electrosterically stabilized Y5O4F7 suspension had the highest hardness and the lowest porosity.

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