The effect of the starting solution on the physico-chemical properties of zinc ferrite synthesized at low temperature

1999 ◽  
Vol 287 (1-2) ◽  
pp. 276-283 ◽  
Author(s):  
J.L.Martı́n de Vidales ◽  
A López-Delgado ◽  
E Vila ◽  
F.A López
Keyword(s):  
Low Temperature ◽  
Zinc Ferrite ◽  
Chemical Properties ◽  
Starting Solution ◽  
Physico Chemical

Albumen-mediated Green Synthesis of ZnFe2O4 Nanoparticles and Their Physico-Chemical Properties

2021 ◽  
Vol 14 (5) ◽  
pp. 445-449
Keyword(s):  
Zinc Ferrite ◽  
Single Phase ◽  
Chemical Properties ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Physico Chemical ◽  
Znfe2o4 Nanoparticles ◽  
Photoluminescence Studies ◽  
Combustion Technique

Abstract: Spinel ferrites with general formula AB2O4 possess charming magnetic and electrical properties owing to their thermal and chemical steadfastness. Spinel zinc ferrite (ZnFe2O4) nanoparticles have attracted massive attention due to their unusual amalgamation of properties, especially magnetic properties, where these properties are equipped as suitable candidates in the field of electronics. Here, a simple self-combustion technique is made with the assistance of albumen to synthesize nanocrystalline zinc ferrite (ZnFe2O4) particles. The egg white (albumen) that is used in the synthesis process plays the fuel role in the process of combustion. The results of the powder X-ray diffraction (PXRD) and Fourier Transform Infrared Spectroscopy (FTIR) suggested that the synthesized nanoparticles are of single phase and show spinel structure. The photoluminescence studies reported a doublet peak at around 360-380 nm. The functional groups present in the synthesized nanoparticles were revealed from FTIR data. EDX findings give an account of the percentage composition of the elements Fe, Zn and O present in the synthesized sample. High-resolution Scanning Microscope (HRSEM) reveals the agglomerated coalescence nature of ferrite nanoparticles. Keywords: Ferrite, PXRD, FTIR, HRSEM, EDX Albumen.

Efficient Assessment of Physico-Chemical Properties of the Cryolite Melts for Research on the Improvement of Low-Temperature Aluminum Electrolysis

2018 ◽  
Vol 284 ◽  
pp. 839-844 ◽  
Author(s):  
V.A. Lebedev ◽  
Andrey A. Shoppert
Keyword(s):  
Low Temperature ◽  
Chemical Properties ◽  
Aluminum Electrolysis ◽  
Total Power ◽  
Potassium Cryolite ◽  
High Magnitude ◽  
Rate Of Dissolution ◽  
Physico Chemical ◽  
Hazardous Production ◽  
High Level

Modern aluminum electrolysis in cryolite-alumina melts is energy-intensive, inefficient and environmentally hazardous production. Addressing these significant shortcomings, the technology of low-temperature electrolyte is directed. The basis of low-temperature electrolysis is potassium cryolite, which results in high magnitude and rate of dissolution of alumina. Additive of sodium and lithium fluorides provide the necessary conductivity. Experimental investigation of these properties is extremely time consuming. In this work, as a parameter, which will allow to characterize effectively and rapidly the complexing ability of cryolite melts, the ratio of cationic ion power of Al3+ to the total power of the other cations of the melt is proposed. Regression analyses of the known experimental data establish the existence with a high level of reliability (R2=0.966-0.995) of a directly proportional dependence of this parameter on solubility of alumina and electrical conductivity of cryolite melts.

scholarly journals Research on Physico-Chemical Properties of Diethyl Ether/Linseed Oil Blends for the Use as Fuel in Diesel Engines

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6564
Author(s):  
Krzysztof Górski ◽  
Ruslans Smigins ◽  
Rafał Longwic
Keyword(s):  
Surface Tension ◽  
Low Temperature ◽  
Diethyl Ether ◽  
Diesel Fuel ◽  
Diesel Engines ◽  
Kinematic Viscosity ◽  
Linseed Oil ◽  
Chemical Properties ◽  
Fuel Blends ◽  
Physico Chemical

Physico-chemical properties of diethyl ether/linseed oil (DEE/LO) fuel blends were empirically tested in this article for the first time. In particular, kinematic viscosity (ν), density (ρ), lower heating value (LHV), cold filter plugging point (CFPP) and surface tension (σ) were examined. For this research diethyl ether (DEE) was blended with linseed oil (LO) in volumetric ratios of 10%, 20% and 30%. Obtained results were compared with literature data of diethyl ether/rapeseed oil (DEE/RO) fuel blends get in previous research in such a way looking on differences also between oil types. It was found that DEE impacts significantly on the reduction of plant oil viscosity, density and surface tension and improve low temperature properties of tested oils. In particular, the addition of 10% DEE to LO effectively reduces its kinematic viscosity by 53% and even by 82% for the blend containing 30% DEE. Tested ether reduces density and surface tension of LO up to 6% and 25% respectively for the blends containing 30% DEE. The measurements of the CFPP showed that DEE significantly improves the low temperature properties of LO. In the case of the blend containing 30% DEE the CFPP can be lowered up to −24 °C. For this reason DEE/LO blends seem to be valuable as a fuel for diesel engines in the coldest season of the year. Moreover, DEE/LO blends have been tested in the engine research. Based on results it can be stated that the engine operated with LO results in worse performance compared with regular diesel fuel (DF). However, it was found that these disadvantages could be reduced with DEE as a component of the fuel mixture. Addition of this ether to LO improves the quality of obtained fuel blends. For this reason, the efficiency of DEE/LO blend combustion process is similar for the engine fuelled with regular diesel fuel. In this research it was confirmed that the smoke opacity reaches the highest value for the engine fuelled with plant oils. However, addition of 20% DEE reduces this emission to the value comparable for the engine operated with diesel fuel.

Effect of a low temperature step during fermentation on the physico-chemical properties of fat-free yogurt

2014 ◽  
Vol 36 (1) ◽  
pp. 14-20 ◽  
Author(s):  
R. Trejo ◽  
M. Corzo-Martínez ◽  
S. Wilkinson ◽  
K. Higginbotham ◽  
F.M. Harte
Keyword(s):  
Low Temperature ◽  
Chemical Properties ◽  
Temperature Step ◽  
Physico Chemical

Ceria added Sb-V2O5/TiO2 catalysts for low temperature NH3 SCR: Physico-chemical properties and catalytic activity

2013 ◽  
Vol 142-143 ◽  
pp. 705-717 ◽  
Author(s):  
Kyung Ju Lee ◽  
Pullur Anil Kumar ◽  
Muhammad Salman Maqbool ◽  
Komateedi Narayana Rao ◽  
Kwang Ho Song ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Chemical Properties ◽  
Nh3 Scr ◽  
Physico Chemical

scholarly journals Physico-Chemical Surface Modifications of Polyetheretherketone (PEEK) Using Extreme Ultraviolet (EUV) Radiation and EUV-Induced Nitrogen Plasma

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4466
Author(s):  
Joanna Czwartos ◽  
Bogusław Budner ◽  
Andrzej Bartnik ◽  
Przemysław Wachulak ◽  
Henryk Fiedorowicz ◽  
...  
Keyword(s):  
Low Temperature ◽  
Photoelectron Spectroscopy ◽  
Extreme Ultraviolet ◽  
Chemical Properties ◽  
Nitrogen Plasma ◽  
Average Roughness ◽  
Temperature Plasma ◽  
Chemical Surface ◽  
Nanosecond Pulses ◽  
Physico Chemical

In this work, the effect of extreme ultraviolet (EUV) radiation and the combination of EUV radiation and low-temperature nitrogen plasma on the physico-chemical properties of polyetheretherketone (PEEK) surfaces were presented. The laser-plasma EUV source based on a double gas puff target was used in this experiment to irradiate PEEK surfaces with nanosecond pulses of EUV radiation and to produce low-temperature plasma through the photoionization of nitrogen with EUV photons. The changes in surface morphology on irradiated polymer samples were examined using atomic force microscopy (AFM) and scanning electron microscopy (SEM). Chemical changes of the PEEK surfaces were analysed using X-ray photoelectron spectroscopy (XPS). EUV radiation and nitrogen plasma treatment caused significant changes in the topography of modified PEEK’s surfaces and an increase in their average roughness. Strong chemical decomposition, appearance of new functional groups as well as incorporation of nitrogen atoms up to ~17 at.% on the PEEK’s surface were observed.

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