Large-Scale Fabrication of Ti3AlC2 Powder with High-Purity

2007 ◽  
Vol 336-338 ◽  
pp. 948-951
Author(s):  
Chang An Wang ◽  
Chun Qing Peng ◽  
Yang Song ◽  
Yong Huang
Keyword(s):  
Particle Size ◽  
High Purity ◽  
Mass Production ◽  
Large Scale ◽  
Raw Materials ◽  
Synthesis Method ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
Sem Observation

A synthesis method of high-pure Ti3AlC2 powder with a large scale was presented as pressureless synthesis using TiC, Ti and Al powders as starting materials at 1300~1450°C in flow Ar. The different raw material scales were tested from 2 g to 1.0 kg, and the results showed that the purities of Ti3AlC2 powders could be kept around 97 wt% at different scales of raw materials. SEM observation and particle size analysis revealed that the synthesized Ti3AlC2 powders were uniform and around 5 μm in particle size. This method can be used for mass production of Ti3AlC2 powders with high-purity.

scholarly journals Mining Wastes of an Albite Deposit as Raw Materials for Vitrified Mullite Ceramics

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 232
Author(s):  
Pedro J. Sánchez-Soto ◽  
Eduardo Garzón ◽  
Luis Pérez-Villarejo ◽  
George N. Angelopoulos ◽  
Dolores Eliche-Quesada
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Phase Evolution ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Mining Wastes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Value

In this work, an examination of mining wastes of an albite deposit in south Spain was carried out using X-ray Fluorescence (XRF), X-ray diffraction (XRD), particle size analysis, thermo-dilatometry and Differential Thermal Analysis (DTA) and Thermogravimetric (TG) analysis, followed by the determination of the main ceramic properties. The albite content in two selected samples was high (65–40 wt. %), accompanied by quartz (25–40 wt. %) and other minor minerals identified by XRD, mainly kaolinite, in agreement with the high content of silica and alumina determined by XRF. The content of Na2O was in the range 5.44–3.09 wt. %, being associated with albite. The iron content was very low (<0.75 wt. %). The kaolinite content in the waste was estimated from ~8 to 32 wt. %. The particle size analysis indicated values of 11–31 wt. % of particles <63 µm. The ceramic properties of fired samples (1000–1350 °C) showed progressive shrinkage by the thermal effect, with water absorption and open porosity almost at zero at 1200–1250 °C. At 1200 °C, the bulk density reached a maximum value of 2.38 g/cm3. An abrupt change in the phase evolution by XRD was found from 1150 to 1200 °C, with the disappearance of albite by melting in accordance with the predictions of the phase diagram SiO2-Al2O3-Na2O and the system albite-quartz. These fired materials contained as main crystalline phases quartz and mullite. Quartz was present in the raw samples and mullite was formed by decomposition of kaolinite. The observation of mullite forming needle-shape crystals was revealed by Scanning Electron Microscopy (SEM). The formation of fully densified and vitrified mullite materials by firing treatments was demonstrated.

scholarly journals Novelty of Bioengineered Iron Nanoparticles in Nanocoated Surgical Cotton: A Green Chemistry

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Bhavika Turakhia ◽  
Saujanya Chikkala ◽  
Sejal Shah
Keyword(s):  
Antimicrobial Activity ◽  
Particle Size ◽  
Green Chemistry ◽  
Iron Nanoparticles ◽  
Synthesis Method ◽  
Cost Effective ◽  
Zingiber Officinale ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Ginger Extract

The current focus of nanotechnology is to develop environmentally safe methodologies for the formulation of nanoparticles. The phytochemistry of Zingiber officinale inspired us to utilize it for the synthesis of iron nanoparticles. GC-MS analysis revealed the phytochemical profile of ginger. Out of 20 different chemicals, gingerol was found to be the most potent phytochemical with a retention time of 40.48 min. The present study reports a rapid synthesis method for the formation of iron nanoparticles and its potential efficacy as an antibacterial agent and an antioxidant. Because of its antibacterial property, ginger extract was used to coat surgical cotton. Synthesized ginger root iron nanoparticles (GR-FeNPs) were characterized by UV-visible spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction analysis, and particle size analysis. XRD confirmed the crystalline structure of iron oxide nanoparticles as it showed the crystal plane (2 2 0), (3 1 1), (2 2 2), and (4 0 0). The particle size analyzer (PSA) showed the average size of the particles, 56.2 nm. The antimicrobial activity of the FeNPs was tested against different Gram-positive and Gram-negative bacteria. E. coli showed maximum inhibition as compared with the other organisms. Antioxidant activity proved the maximum rate of free radicals at 160 µg/mL produced by nanoparticles. In addition, the antimicrobial activity of nanocoated surgical cotton was evaluated on the first day and 30th day after coating, which clearly showed excellent growth inhibition of organisms, setting a new path in the field of medical microbiology. Hence, iron-nanocoated surgical cotton synthesized using green chemistry, which is antimicrobial and cost effective, might be economically helpful and provide insights to the medical field, replacing conventional wound healing treatments, for better prognosis.

Study on the Reaction Process of Ploy-High-Ferric-Silicic Coagulant

2010 ◽  
Vol 156-157 ◽  
pp. 1074-1077
Author(s):  
Yan Zhen Yu ◽  
Juan Tan ◽  
Yong Sun
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Theoretical Basis ◽  
Raw Materials ◽  
Particle Size Analysis ◽  
Synthesis Process ◽  
Size Analysis ◽  
Potassium Ferrate ◽  
Transmission Electron ◽  
Complexation Process

A new inorganic polymer coagulant，ploy-high-ferric-silicic coagulant with various Si/FeO42- ratios and salt-basicity, was prepared using the fly ash extract and potassium ferrate. The influence of both Si/FeO42- ratios and salt-basicity on the complexation process was explored with many analytical methods, such as transmission electron microscope (TEM), lased particle size analysis (LPSA) and infrared spectrum (IR). The results show that the ploy-high-ferric-silicic is a complexation compound, instead of a simple mixture of raw materials. The complexation process between Si and Fe may be different from various Si/FeO42- ratios and salt-basicity. The bonding can help revealing the high-ferric groups function in synthesis process. From analyzing the different ferrosilicon bonding modes, it can provide some theoretical basis to compound high-ferric coagulant.

Preparation of Nano-TiO2 in Inverse Micro-Emulsion System with Compound Surfactant

2011 ◽  
Vol 412 ◽  
pp. 25-31
Author(s):  
Wen Yuan Gao ◽  
Xing Xin Jia ◽  
Mei Hong Niu ◽  
Nai Ling Tang ◽  
Zhi Qiang Hu
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
Surface Active Agents ◽  
Micro Emulsion ◽  
Emulsion Process ◽  
Surface Active ◽  
Average Size

The nanosized TiO2 is prepared by micro-emulsion process in the system of cyclohexane / [Span80 combined with OP-10] / water with TiCl4 as raw material. The selection method of the surface-active agents was investigated and the influence of amount of surfactant, water / oil ratio and concentration of reactants on the particle size were discussed in this work. The temperature schedule, crystal structure, particle size distribution and appearance of the nanocrystalline TiO2 were analyzed by differential thermal analysis (DTA) combined with X-ray diffraction (XRD), laser particle size analysis (LPSA) and scanning electron microscope (SEM). The results showed that: under these conditions of mixture of 8g Span80 and 2g OP-10 as the emulsifier, water / oil mass ratio of 1/4, TiCl4 concentration of 0.6mol / L and calcinations temperature of 510°C, nanoTiO2 powder with smaller particle size and better dispersion was prepared . And the average size of the product was 27.3nm.

Influence of Raw Material Concentration on Product Characterization of Magnesium Hydroxide Prepared via Ammonia Method

2014 ◽  
Vol 900 ◽  
pp. 337-343
Author(s):  
Hui Fang Li ◽  
Li Juan Li ◽  
Zhi Qi Liu ◽  
Xiao Wu Peng ◽  
Dong Shi ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnesium Hydroxide ◽  
Magnesium Chloride ◽  
Raw Materials ◽  
Sudden Change ◽  
Raw Material ◽  
Narrow Particle Size Distribution ◽  
Size Analysis ◽  
Globular Structure ◽  
Product Characterization

Magnesium hydroxide was prepared through direct precipitation using magnesium chloride and ammonia as raw materials. In this paper, we mainly studied the effects of magnesium hydroxide on product characterization when the concentration of raw materials was changed. The products were characterized through laser light particle size analysis, scan electron microscope and X-ray diffraction. The study showed that a sudden change in the morphology of magnesium hydroxide products and in the polarity of the crystal occurred under the following conditions: stirring speed of 2500 rpm, reaction temperature of 60°C, ammonia to magnesium chloride ratio of 2:1, ammonia addition rate of 20 mL/min, and aging time of 30 min. As the raw material concentration was changed, the morphology of magnesium hydroxide products and the polarity of the crystal exhibited sudden change. When the concentration of magnesium chloride was changed to 0.8 mol/L, the product demonstrated a flower-like globular structure, the largest size, and the minimum polarity. When the concentration of magnesium chloride was more than 1 mol/L, the product exhibited a flake structure, no obvious aggregation and a narrow particle size distribution.

scholarly journals Parametric Study of Matisaa Gray Rock as a Potential Clinker Material

2020 ◽  
pp. 22-29
Author(s):  
Mwendwa Geoffrey ◽  
Motochi Isaac ◽  
Otieno Fredrick
Keyword(s):  
Particle Size ◽  
Size Composition ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
Particle Sizes ◽  
X Ray ◽  
Saturation Factor ◽  
Clinker Production

This study aimed at evaluating Matisaa gray rock (MGR) for clinker production. MGR is naturally abundant in Matisaa, a rural area in Mwingi West District, Kitui county, Kenya. It is locally used as a gabion filler and other concrete structures with desirable physico-mechanical properties. This research employed a controlled experimental design to determine the clinker qualification of MGR. This was based on particle size analysis and raw meal moduli. The standard sieve tests and a Blaine meter were used in the determination of particle size while the raw meal moduli were determined from the respective cement oxides in MGR, which were determined using wavelength dispersive X-ray fluorescence (WDXRF) spectrometer. It was observed that 69.65% of the particle size composition of MGR was less than 90 . Out of this composition, 71.60% of the particle sizes were less than 45 , contributing to a specific surface area of 292.5 . The hydraulic modulus (2.05 – 2.61) and lime saturation factor (0.87 – 0.98) are quite desirable though the silica and alumina ratios are higher than the standard range due to the low proportions of  and  content. The sulfatisation modulus is also undesirable due to the high content of . Thus, without beneficiation, Matisaa gray rock would lead to the production of low-quality clinker. However, the general parametric comparison of Matisaa gray rock with Konza shows that it has the potential for utilization as a clinker raw material.

scholarly journals Preparation of the monodispersed carboxyl-functionalized polymer microspheres with disproportionated rosin moiety and adsorption of methylene blue

2018 ◽  
Vol 36 (5-6) ◽  
pp. 1260-1273 ◽  
Author(s):  
Cai-Li Yu ◽  
Feng Bian ◽  
Shu-Fen Zhang ◽  
Xu Xu ◽  
Peng Ren ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Raw Materials ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Average Particle ◽  
Polymer Microspheres ◽  
Carboxyl Content ◽  
Methylene Blue Adsorption

Carboxyl-functionalized polymer microspheres with a rosin moiety were prepared through dispersion polymerization using styrene, disproportionated rosin ester, and methylacrylic acid as raw materials. The effects of dispersion medium (ethanol/water) ratio, monomer mass proportion and initiator concentration on the polymer microspheres were studied. Scanning electron microscopy, laser particle size analysis, thermogravimetric analysis and Fourier transform infrared spectroscopy were used to characterize the microspheres, and their carboxyl contents were determined by the conductance titration method. The adsorption of methylene blue of the microspheres was also investigated. The results showed that rosin-based carboxyl-functionalized polymer microspheres were successfully synthesized. The microspheres exhibited smooth, spherical shapes with good monodispersity and high thermal stability. The carboxyl content of the microspheres prepared under optimum conditions was 0.089 mmol·g−1, with the average particle size approximately 950 nm. With increasing carboxyl contents of the polymer microspheres, their methylene blue adsorption capacities increased. The maximum methylene blue adsorption capacity of the microspheres was 59.55 mg·g−1 in the highest carboxyl content.

Synthesis, Characterization and Biocompatibility of Holmium Zirconate/Zinc Sulphide Nanocomposite in Albino Mice in a Gender Specific Manner

2021 ◽  
Vol 43 (1) ◽  
pp. 46-46
Author(s):  
Hafsa Noureen Hafsa Noureen ◽  
Mubashra Salim Mubashra Salim ◽  
Amjad Nadeem Amjad Nadeem ◽  
Sana Shafiq Sana Shafiq ◽  
Samia Yousuf Samia Yousuf ◽  
...  
Keyword(s):  
Particle Size ◽  
Synthesis Method ◽  
Particle Size Analysis ◽  
Zinc Sulphide ◽  
Size Analysis ◽  
Control Group ◽  
Serum Parameters ◽  
Specific Manner ◽  
Albino Mice ◽  
Gender Specific

Aim of this study was to report the biocompatibility of Holmium zirconate, zinc sulphide and holmium zirconate/zinc sulphide (HO2Zr2O7/ZnS) nanocomposite in albino mice. Holmium zirconate, zinc sulphide and holmium zirconate/zinc sulphide (Ho2Zr2O7/ZnS) nanocomposite were synthesized by, normal microemulsion, chemical co-precipitation and two step synthesis method, respectively. The synthesized materials were characterized by X-ray diffraction (XRD) for the confirmation of phase while scanning electron microscopy (SEM) was used morphological analysis. The composition and the particle size distribution were confirmed by energy dispersive spectroscopy and particle size analysis respectively. Seven week old mice were divided into two groups in a gender specific manner: control group that were intraperitoneally injected with saline solution and treated group were administered with 50 mg/ml solvent/Kg body weight of Holmium zirconate/zinc sulphide nanocomposite for 22 days. A series of neurological tests, blood cell count, selected serum parameters and biomarkers of oxidative stress were analysed in vital organs of both treatments. It was observed that nanocomposite treated female mice remained mobile (P = 0.05) for longer time while both male (P = 0.03) and female (P = 0.02) mice had more rotations than saline treated mice during open field test. Nanocomposite treated male had reduced stretch attend reflex during light dark box test. Blood and serum parameters remained unaffected (P ˃ 0.05) when compared between nanocomposite treated and untreated mice of both genders. Malondialdehyde concentration was significantly elevated (P = 0.04) in liver of male while superoxide dismutase concentrations were significantly reduced (P = 0.05) in brain of female albino mice treated with nanocomposite than their respective control groups.

Evaluation of the Potential of Using Quartzite Residue in Mass for the Production of Sanitary Ware

2016 ◽  
Vol 869 ◽  
pp. 181-185 ◽  
Author(s):  
Paula Simone Soares de Medeiros ◽  
L.N.L. Santana ◽  
V.J. Silva ◽  
Gelmires Araújo Neves ◽  
Hélio Lucena Lira
Keyword(s):  
Raw Materials ◽  
Slip Casting ◽  
Physical And Mechanical Properties ◽  
Casting Process ◽  
Particle Size Analysis ◽  
Sanitary Ware ◽  
Raw Material ◽  
Firing Process ◽  
Size Analysis ◽  
Clay Kaolin

Currently there is a great concern on the part of the industries with the disposal of waste generated in the production process. The quartzite processing industry generates significant amount of residue, consisting primarily of quartz. The aim of this work is to evaluate the incorporation of quartzite residue, replacing partially the quartz and feldspar, in ceramic mass used in the production of sanitary ware. The raw materials were characterized by chemical and particle size analysis. Compositions were formulated by varying the amount of residue and comparing with an industrial mass, consisted of clay, kaolin, feldspar and quartz. The slip casting process was used in the preparation of the specimens. The results showed that the residue can be considered as an alternative raw material for use in sanitary ware industry, since the ceramic slip presented appropriate rheological properties and after firing process the specimens presented physical and mechanical properties according to the specifications.

Bio-mimetic synthesis of silver nanoparticles

2020 ◽  
Vol 7 (1) ◽  
pp. 1-5
Author(s):  
Avinash Kumar Reddy G ◽  
Krishna Reddy BV ◽  
Nageswara Rao G
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Large Scale ◽  
Uv Spectroscopy ◽  
Cost Effective ◽  
Particle Size Analysis ◽  
Nano Particles ◽  
Size Analysis ◽  
Metallic Silver ◽  
Analytical Instruments

Silver nanoparticles have their demand in various fields of science and technology and their applications extend even in medical and pharmaceutical arenas. They have been used as preservatives, diagnosing aids and potent antibacterial agents. But their production is a serious matter of concern when it comes to cost, efficacy and toxicity issues. Overcoming these limitations green synthesis has taken its advantage for their commercial and large scale synthesis. This research concentrates on the preparation of silver nano particles by using purified leaf extract of Lannea coromandelica and evaluation of the same using UV-Vis Spectrophotometry, FTIR, EDXS, SEM and particle size analysis. The produced nanoparticles exhibited surface plasmon resonance at 420nm in UV spectroscopy. EDS Spectrum showed the presence of metallic silver in the solution. They are roughly cubic in shape, smooth surfaced and measure about 10-20nm in diameter which is evident from the particle size analysis. FTIR studies revealed the presence of O-H groups indicating polyphenols and also confirms capping of proteins over the nanoparticles. The results proved the eco-friendly synthesized silver nanoparticles. The prepared nanoparticles have been analyzed using sophisticated analytical instruments. The results confirm the formation of silver nanoparticles. The bio-mimetic synthesis of silver nanoparticles is relatively safer and cost effective. The potency and effect of silver nanoparticles was determined yet the toxicity was to be considered for establishing it as a therapeutic agent.

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