Formation of metal-carbon nanocomposites based on Cu-Fe alloy nanoparticles and carbonized polyacrylonitrile

A method for the synthesis of nanoparticles of the Cu-Fe bimetallic system with limited mutual solubility of the components is proposed. The synthesis method consists of a one-stage process of IR pyrolysis of precursors in the form of films obtained from a joint solution of polyacrylonitrile and hydrates-nitrates of iron and copper. The effect of the synthesis temperature on the structure formation of the nanocomposites and the phase composition of bimetallic Cu-Fe nanoparticles dispersed in the carbon matrix was studied. The analysis showed a simultaneous presence of Fe and Cu phases in nanocomposites, presumably with a low solubility of the components. The average particle size is 14-17 nm and changes insignificantly with an increase in the synthesis temperature from 400 to 700°C. An increase in the synthesis temperature to 800°C led to a broadening of the particle size distribution and the increase in the average size. The formation of complex carbon nanostructures on Cu-Fe nanoparticles is found.

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Microwave Synthesis of Nano-Titanium Carbide

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.399-401.561 ◽

2011 ◽

Vol 399-401 ◽

pp. 561-564 ◽

Cited By ~ 1

Author(s):

Ping An Liu ◽

Qing Song Yang ◽

An Ze Shui ◽

Hui Wang ◽

Xiao Su Cheng ◽

...

Keyword(s):

Particle Size ◽

Low Temperature ◽

Carbon Black ◽

Titanium Carbide ◽

Microwave Synthesis ◽

Average Particle Size ◽

Synthesis Method ◽

Synthesis Temperature ◽

Synthesis Rate ◽

Average Particle

A new synthesis technology of titanium carbide with microwave is introduced in this article. Microwave synthesis technology is a fast and relatively low temperature of synthesis method. Nano-titanium carbide powders were synthesized by carbothermal reduction of titanium dioxide and carbon black with the microwave synthesis method at 1100°C-1400°C in argon gas atmosphere. Nano-TiO2powder and carbon black were used as raw materials. The TiC powders were characterized with the XRD and TEM. The experimental results show that the synthesis rate is quick, even at relatively low synthesis temperature. The average particle size of the TiC powders synthesized by the microwave synthesis technology under low temperature (<1300°C) is less than 50nm, and the average particle size augments with increasing the microwave synthesis temperature and time.

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Effect of the polymeric coating over Fe3O4 particles used for magnetic separation

Open Chemistry ◽

10.2478/s11532-010-0073-4 ◽

2010 ◽

Vol 8 (5) ◽

pp. 1041-1046 ◽

Cited By ~ 17

Author(s):

Raúl Reza ◽

Carlos Martínez Pérez ◽

Claudia Rodríguez González ◽

Humberto Romero ◽

Perla García Casillas

Keyword(s):

Particle Size ◽

Magnetite Nanoparticles ◽

Average Particle Size ◽

Spherical Shape ◽

Polymeric Coating ◽

Average Particle ◽

Synthesis Conditions ◽

Aging Conditions ◽

Magnetite Particles ◽

Average Size

AbstractIn this work, the synthesis of magnetite nanoparticles by two variant chemical coprecipitation methods that involve reflux and aging conditions was investigated. The influence of the synthesis conditions on particle size, morphology, magnetic properties and protein adsorption were studied. The synthesized magnetite nanoparticles showed a spherical shape with an average particle size directly influenced by the synthesis technique. Particles of average size 27 nm and 200 nm were obtained. When the coprecipitation method was used without reflux and aging, the smallest particles were obtained. Magnetite nanoparticles obtained from both methods exhibited a superparamagnetic behavior and their saturation magnetization was particle size dependent. Values of 67 and 78 emu g−1 were obtained for the 27 nm and 200 nm magnetite particles, respectively. The nanoparticles were coated with silica, aminosilane, and silica-aminosilane shell. The influence of the coating on protein absorption was studied using Bovine Serum Albumin (BSA) protein.

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Preparation of Cr2O3 Nanoparticles via Hydrothermal Reduction of CH3OH

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.463-464.760 ◽

2012 ◽

Vol 463-464 ◽

pp. 760-763

Author(s):

Zhen Zhao Pei ◽

Hong Bin Xu ◽

Yi Zhang

Keyword(s):

Particle Size ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Average Particle Size ◽

Average Particle ◽

Calcination Temperatures ◽

Cr2o3 Nanoparticles ◽

Average Size ◽

Hydrothermal Reduction ◽

Scanning Electron

Nanoparticles of Cr2O3 were successfully obtained via hydrothermal reduction of CH3OH. The oxidant and chromium source was CrO3. The process needs no stirrer or surfactant and the CrO3 concentration was 0.83mol/L. The obtained products were loosely agglomerated Cr2O3 nanoparticles with the average size of 29 to 79 nm. Influences of reactant ratios and calcination temperatures on the specific surface area and average particle size were discussed. And the morphology of nanoparticles was investigated by use of field-emission scanning electron microscope.

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Microemulsion Synthesis of Nd0.5Ca0.5MnO3 and Nd0.5Sr0.5MnO3 Nanoparticles

MRS Proceedings ◽

10.1557/proc-0962-p10-17 ◽

2006 ◽

Vol 962 ◽

Author(s):

Z. Q. Wang ◽

K. B. Yin ◽

F. Gao ◽

K. F. Wang ◽

Z. F. Ren ◽

...

Keyword(s):

Particle Size ◽

Average Particle Size ◽

Synthesis Method ◽

Charge Order ◽

Freezing Behavior ◽

Average Particle ◽

High Quality ◽

Spin Freezing ◽

Microemulsion Synthesis ◽

Order State

ABSTRACTNd0.5Ca0.5MnO3 (NCMO) and Nd0.5Sr0.5MnO3 (NSMO) nanoparticles have been synthesized using microemulsion synthesis method, with hexamethylene alkyl, a mixture of OP and 1-hexanol, NaOH as oil phase, surfactant, and precipitating agent, respectively. The phase formation of NCMO and NSMO nanoparticles was examined. The final NCMO and NSMO nanoparticles have average particle size of 24 and 50 nm, respectively, and present high-quality crystallinity. Measurements of the magnetic properties suggest that the charge-order state favored for bulk NCMO phase collapses in NCMO nanoparticles. The spin freezing behavior for both NCMO and NSMO nanoparticles was identified.

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Synthesis of Nano-Sized Barium Titanate Powder by Rotary-Hydrothermal Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.421-422.269 ◽

2009 ◽

Vol 421-422 ◽

pp. 269-272

Author(s):

Takashi Kubo ◽

Masayuki Hogiri ◽

Hiroshi Kagata ◽

Atsushi Nakahira

Keyword(s):

Particle Size ◽

Average Particle Size ◽

Hydrothermal Process ◽

Water System ◽

Starting Material ◽

Average Particle ◽

Rotary Speed ◽

Average Size ◽

Faceted Particles

Nano-sized BaTiO3 powders with narrow size distribution and the high tetragonality were attempted to synthesize by the rotary-hydrothermal process in water system, using two kinds of commercial anatase-type TiO2 (ST21/ST01) with different particle size and Ba(OH)2. The rotary-hydrothermal syntheses were done with the rotary-speed of 20 revolutions per minute at 523 K for 24 h. Highly- and mono-dispersed BaTiO3 powders were successfully synthesized by applying the rotary-hydrothermal process. For rotary-hydrothermal synthesis, it was found that the average size, tetragonality, and quality of the BaTiO3 particle strongly depended on the particle size of the starting material. In the case of using ST01 as a starting material, BaTiO3 nano-powders mainly composed of coarse-faceted particles (average particle size = ca.100 nm) with the tetragonal phase and very little lattice defects were successfully synthesized.

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Preparation and Characterization of Gold Nanoparticles in the Presence of Citrate and Soybean Seed Extract in an Acidic Conditions

Drug Research ◽

10.1055/s-0042-113459 ◽

2017 ◽

Vol 67 (05) ◽

pp. 266-270 ◽

Cited By ~ 3

Author(s):

Ebrahim Izadi ◽

Ali Rasooli ◽

Abolfazl Akbarzadeh ◽

Soodabeh Davaran

Keyword(s):

Particle Size ◽

Gold Nanoparticles ◽

Size Distribution ◽

Average Particle Size ◽

Soybean Seed ◽

Average Particle ◽

X Ray Diffraction ◽

Soybean Extract ◽

Average Size

AbstractThrough the present study, an eco-friendly method was used to synthesize the gold nanoparticles (GNPs) by using the sodium citrate and extract of the soybean seed as reducing the agents at PH 3. X-Ray diffraction (XRD) method was used to evaluate the crystal structure of as-synthesized NPs and it’s revealed that this method leads to well crystallized GNPs. In order to determine the particle size and their distribution, field emission scanning microscopy (FE-SEM) and dynamic light scattering (DLS) were used. The results showed that, the average particle size distribution of synthesized GNPs in solutions containing of the soybean extract and 1% citrate at PH 3 is about 109.6 and 140.9 nm, respectively. Also, we find that the average size of GNPs is 40 and 33 nm from solutions of citrate and soybean extract, respectively. It was concluded that using the extract of soybean seeds as reducing agent can lead to GNPs with small size and narrow size distribution.

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Structural and Optical Properties of Silicon Carbide Powders Synthesized from Organosilane Using High-Temperature High-Pressure Method

Nanomaterials ◽

10.3390/nano11113111 ◽

2021 ◽

Vol 11 (11) ◽

pp. 3111

Author(s):

Evgeny A. Ekimov ◽

Vladimir S. Krivobok ◽

Mikhail V. Kondrin ◽

Dmitry A. Litvinov ◽

Ludmila N. Grigoreva ◽

...

Keyword(s):

Particle Size ◽

Optical Properties ◽

Average Particle Size ◽

Synthesis Temperature ◽

Narrow Particle Size Distribution ◽

High Tech ◽

Average Particle ◽

Coupled Modes ◽

Dominant Type ◽

High Structure

The development of new strategies for the mass synthesis of SiC nanocrystals with high structure perfection and narrow particle size distribution remains in demand for high-tech applications. In this work, the size-controllable synthesis of the SiC 3C polytype, free of sp2 carbon, with high structure quality nanocrystals, was realized for the first time by the pyrolysis of organosilane C12H36Si6 at 8 GPa and temperatures up to 2000 °C. It is shown that the average particle size can be monotonically changed from ~2 nm to ~500 nm by increasing the synthesis temperature from 800 °C to 1400 °C. At higher temperatures, further enlargement of the crystals is impeded, which is consistent with the recrystallization mechanism driven by a decrease in the surface energy of the particles. The optical properties investigated by IR transmission spectroscopy, Raman scattering, and low-temperature photoluminescence provided information about the concentration and distribution of carriers in nanoparticles, as well as the dominant type of internal point defects. It is shown that changing the growth modes in combination with heat treatment enables control over not only the average crystal size, but also the LO phonon—plasmon coupled modes in the crystals, which is of interest for applications related to IR photonics.

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Preparation of Fe Nanoparticles by Confined Arc Plasma Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1206 ◽

2012 ◽

Vol 476-478 ◽

pp. 1206-1209

Author(s):

Xiao Ju Yao ◽

Zhi Qiang Wei ◽

Hua Yang ◽

Li Gang Liu

Keyword(s):

Particle Size ◽

Average Particle Size ◽

Average Particle ◽

Arc Plasma ◽

X Ray ◽

Plasma Method ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Fe Nanoparticles ◽

Bcc Structure

In the protecting inert gas, Fe nanoparticles were successfully prepared by confined arc plasma method. The particle size, microstructure and morphology of the particles by this process were characterized via X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption equation, transmission electron microscopy (TEM) and the corresponding selected area electron diffraction (SAED). The experiment results indicate that the samples by this process distributed uniform with spherical chain shapes, the crystal structure is body centered cubic (BCC) structure as same as the bulk materials, the particle size distribution ranging from 20 to 70 nm, with an average particle size about 39 nm obtained by TEM and confirmed by XRD and BET results. The specific surface area is 17.5 m2/g.

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Sintesis Nanopartikel Perak Menggunakan Ekstrak Daun Salam (Syzygium polyanthum) Sebagai Bioreduktor Dan Uji Aktivitasnya Sebagai Antioksidan

Indo J Chem Res ◽

10.30598//ijcr.2019.7-ptb ◽

2019 ◽

Vol 7 (1) ◽

pp. 51-60

Author(s):

Paulina Taba ◽

Nadya Yuli Parmitha ◽

Syahruddin Kasim

Keyword(s):

Particle Size ◽

Silver Nanoparticles ◽

Leaf Extract ◽

Average Particle Size ◽

Average Diameter ◽

Average Particle ◽

X Ray ◽

Synthesis Of Nanoparticles ◽

Particle Size Analyzer ◽

Ic50 Value

Silver nanoparticles have been synthesized by the reduction method using salam leaf extract (Syzygium polyanthum) as a reducing agent. The silver nanoparticles produced were then tested for their activity as antioxidants. The formation of silver nanoparticles was carried out by adding the leaf extract into the solution of AgNO3 and homogenized using a magnetic stirrer. A UV-Vis spectrophotometer was used to confirm the formation of silver nanoparticles. Particle Size Analyzer (PSA), Scanning Electron Microscope (SEM), X-Ray Diffractometer (XRD) and Fourir Transform Infra Red (FTIR) spectrometers were used to characterize the nanoparticles produced before being tested for antioxidant activity. The results showed that the absorbance value increased with increasing reaction contact time. The maximum uptake was obtained at wavelengths of 432-446 nm using a UV-Vis spectrophotometer. The particle size was determined using a PSA with an average particle size distribution of 45.7 nm. The average diameter of silver nanoparticles was 10.06 – 13.97 nm and the silver nanoparticles had rod-shapes. Functional groups that play a role in the synthesis of nanoparticles were –OH, –C=O, and –C-O groups. Silver nanoparticles inhibited free radicals as antioxidants with the IC50 value of 582.7 ppm.

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Fabrication of Nano-Sized Tin Oxide Powder by Spray Pyrolysis Process

MRS Proceedings ◽

10.1557/proc-1174-v09-31 ◽

2009 ◽

Vol 1174 ◽

Cited By ~ 1

Author(s):

Jaekeun Yu ◽

Jwayeon Kim ◽

Jeoungsu Han

Keyword(s):

Particle Size ◽

Spray Pyrolysis ◽

Reaction Temperature ◽

Tin Oxide ◽

Average Particle Size ◽

Raw Material ◽

Nano Particles ◽

Average Particle ◽

Average Size ◽

20 Nm

AbstractBy using tin chloride solution as the raw material, a nano-sized tin oxide powder with average particle size below 50 nm is generated by spray pyrolysis reaction. This study also examines the influences of the reaction parameters such as reaction temperature and the concentration of raw material solution on the powder properties. As the reaction temperature increases from 800 to 850 ℃, the average particle size of the generated powder increases from 20 nm to 30 nm. As the reaction temperature reaches 900 ℃, the droplets are composed of nano-particles with average size of 30 nm, while the average size of individual particles increases remarkably up to 80˜100 nm. When the tin concentration reaches 75 g/L, the average particle size of the powder is below 20 nm. When the tin concentration reaches 150 g/L, the droplets are composed of nano particles with average size around 30 nm, whereas the average size of independent particles increases up to 80˜100 nm. When the concentration reaches 400 g/L, the droplets are composed of nano-particles with average size of 30 nm.

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