scholarly journals Thermophysical Properties of Solutions of Iron (III) Nitrate-Nonahydrate in Mixtures of Ethanol and Water

2021 ◽  
Author(s):  
Alexander Keller ◽  
Irenäus Wlokas ◽  
Maximilian Kohns ◽  
Hans Hasse
Keyword(s):  
Thermophysical Properties ◽  
Pure Water ◽  
Flame Synthesis ◽  
Oxide Nanoparticles ◽  
Empirical Correlations ◽  
Specific Density ◽  
Pure Ethanol ◽  
Spray Flame ◽  
Nitrate Nonahydrate

The quality of nanoparticles that are obtained by spray flame synthesis dependsstrongly on the thermophysical properties of the precursor solutions. Solutions ofiron(III)nitrate-nonahydrate (INN) in ethanol are interesting precursor solutions forthe production of iron oxide nanoparticles in these processes. However, no data onthermophysical properties of solutions of INN in ethanol are available in theliterature. Therefore, in the present work, the specific density, viscosity, thermalconductivity and molar isobaric heat capacity of solutions of INN in solvent mixturesof ethanol and water were measured at 101.3 kPa between 288.15 and 333.15 K,solvent compositions ranging from pure ethanol to pure water, and INN molalities upto 1.3 mol kg-1. Empirical correlations of the experimental data are provided.

scholarly journals Thermophysical Properties of Solutions of Iron(III) Nitrate Nonahydrate in Mixtures of 1-Propanol and Water

2021 ◽  
Author(s):  
Alexander Keller ◽  
Irenäus Wlokas ◽  
Maximilian Kohns ◽  
Hans Hasse
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Thermophysical Properties ◽  
Pure Water ◽  
Mixed Solvents ◽  
Empirical Correlations ◽  
High Quality ◽  
Specific Density ◽  
Spray Flame ◽  
Nitrate Nonahydrate

The simulation of spray flame processes for the production of high-quality nanoparticles relies on thermophysical properties of the precursor solutions, for which literature data are scarce. Here, we report experimental thermophysical data of solutions of iron(III) nitrate nonahydrate (INN) in (1-propanol + water) mixed solvents. The specific density, viscosity, thermal conductivity, and isobaric heat capacity of the solutions were measured at 101.3 kPa between 288.15 and 333.15 K, solvent compositions ranging from 0.73 mol mol–1 1-propanol to pure water, and INN molalities up to 1.3 mol kg–1. Empirical correlations of the experimental data are provided.

scholarly journals Thermophysical Properties of Mixtures of Titanium(IV) Isopropoxide (TTIP) and p-Xylene

2021 ◽  
Author(s):  
Alexander Keller ◽  
Irenäus Wlokas ◽  
Maximilian Kohns ◽  
Hans Hasse
Keyword(s):  
Thermophysical Properties ◽  
Process Design ◽  
Empirical Correlations ◽  
Liquid Equilibrium ◽  
Specific Density ◽  
Vapor Liquid Equilibrium ◽  
Self Diffusion ◽  
Spray Flame ◽  
Equilibrium Data ◽  
Vapor Liquid

Titanium(IV) isopropoxide (TTIP) is an important precursor for the production of nanoparticles by spray flame processes. In these processes, the precursor is provided in a solution in a combustible solvent, which is p-xylene here. As no thermophysical data for solutions of TTIP in p-xylene were available in the literature, they were measured in the present work. The vapor–liquid equilibrium was measured at pressures ranging from 20 to 80 kPa. The specific density, viscosity, thermal conductivity, molar isobaric heat capacity, and self-diffusion coefficients were determined experimentally at 101.3 kPa at temperatures between 293.15 and 373.15 K. Sample compositions cover the range from pure TTIP to pure p-xylene. Chemical reactions in the studied system were considered. The experiments were carried out in such a way that they do not compromise the results for the thermophysical properties. The vapor–liquid equilibrium data were correlated using the NRTL model. Empirical correlations were established for the other properties. The results provide a rational basis for spray flame process design.

Experimental Study on the Specific Heat Capacity Measurement of Water-Based Al2O3-Cu Hybrid Nanofluid by using Differential Thermal Analysis Method

2019 ◽  
Vol 15 ◽  
Author(s):  
Andaç Batur Çolak ◽  
Oğuzhan Yıldız ◽  
Mustafa Bayrak ◽  
Ali Celen ◽  
Ahmet Selim Dalkılıç ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Thermophysical Properties ◽  
Volume Concentration ◽  
Pure Water ◽  
Heat Capacity Measurement ◽  
Experimental Results ◽  
Hybrid Nanofluid ◽  
Capacity Measurement

Background: Researchers working in the field of nanofluid have done many studies on the thermophysical properties of nanofluids. Among these studies, the number of studies on specific heat are rather limited. In the study of the heat transfer performance of nanofluids, it is necessary to increase the number of specific heat studies, whose subject is one of the important thermophysical properties. Objective: The authors aimed to measure the specific heat values of Al2O3/water, Cu/water nanofluids and Al2O3-Cu/water hybrid nanofluids using the DTA method, and compare the results with those frequently used in the literature. In addition, this study focuses on the effect of temperature and volume concentration on specific heat. Method: The two-step method was used in the preparation of nanofluids. The pure water selected as the base fluid was mixed with the Al2O3 and Cu nanoparticles and Arabic Gum as the surfactant, firstly mixed in the magnetic stirrer for half an hour. It was then homogenized for 6 hours in the ultrasonic homogenizer. Results: After the experiments, the specific heat of nanofluids and hybrid nanofluid were compared and the temperature and volume concentration of specific heat were investigated. Then, the experimental results obtained for all three fluids were compared with the two frequently used correlations in the literature. Conclusion: Specific heat capacity increased with increasing temperature, and decreased with increasing volume concentration for three tested nanofluids. Cu/water has the lowest specific heat capacity among all tested fluids. Experimental specific heat capacity measurement results are compared by using the models developed by Pak and Cho and Xuan and Roetzel. According to experimental results, these correlations can predict experimental results within the range of ±1%.

Spray-Flame Synthesis of LaMnO3+δ Nanoparticles for Selective CO Oxidation (SELOX)

2021 ◽  
Author(s):  
Steven Angel ◽  
Juan David Tapia ◽  
Jaime Gallego ◽  
Ulrich Hagemann ◽  
Hartmut Wiggers
Keyword(s):  
Co Oxidation ◽  
Flame Synthesis ◽  
Selective Co Oxidation ◽  
Spray Flame

scholarly journals Droplet sizing in spray flame synthesis using wide-angle light scattering (WALS)

2020 ◽  
Vol 126 (5) ◽  
Author(s):  
Simon Aßmann ◽  
Bettina Münsterjohann ◽  
Franz J. T. Huber ◽  
Stefan Will
Keyword(s):  
Light Scattering ◽  
Flame Synthesis ◽  
Wide Angle ◽  
Spray Flame

scholarly journals Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

Processes ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 820 ◽  
Author(s):  
Yunus ◽  
Halim ◽  
Wilfred ◽  
Murugesan ◽  
Lim ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Thermophysical Properties ◽  
Molecular Volume ◽  
Co2 Absorption ◽  
Thermal Coefficient ◽  
Empirical Correlations ◽  
Protic Ionic Liquids ◽  
Thermogravimetric Analyzer ◽  
Density Values ◽  
Thermal Stability Of

Ionic liquids, which are classified as new solvents, have been identified to be potential solvents in the application of CO2 capture. In this work, six ammonium-based protic ionic liquids, containing ethanolammonium [EtOHA], tributylammonium [TBA], bis(2-ethylhexyl)ammonium [BEHA] cations, and acetate [AC] and butyrate [BA] anions, were synthesized and characterized. The thermophysical properties of the ammonium-based protic ionic liquids were measured. Density, , and dynamic viscosity, , were determined at temperatures between 293.15 K and 363.15 K. The density and viscosity values were correlated using empirical correlations and the thermal coefficient expansion, p, and molecular volume, Vm, were estimated using density values. The thermal stability of the ammonium-based protic ionic liquids was investigated using thermogravimetric analyzer (TGA) at a heating rate of 10 C.min‒1. The CO2 absorption of the ammonium-based ionic liquids were measured up to 20 bar at 298.15 K. From the experimental results, [BEHA][BA] had the highest affinity towards CO2 with the mol fraction of CO2 absorbed approaching 0.5 at 20 bar. Generally, ionic liquids with butyrate anions have better CO2 absorption than that of acetate anions while [BEHA] ionic liquids have higher affinity towards CO2 followed by [TBA] and [EtOHA] ionic liquids.

scholarly journals Aqueous ozone solutions for pesticide removal from potatoes

2016 ◽  
Vol 22 (8) ◽  
pp. 752-758 ◽  
Author(s):  
Fernanda F Heleno ◽  
Maria Eliana LR de Queiroz ◽  
Lêda RA Faroni ◽  
Antônio A Neves ◽  
André F de Oliveira ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Human Health ◽  
Pesticide Residues ◽  
Pure Water ◽  
Pesticide Analysis ◽  
Quantification Limit ◽  
Pesticide Removal ◽  
High Consumption ◽  
Potential Impact

The presence of pesticide residues in potatoes is of concern because of the potential impact to human health due to the high consumption of this vegetable. In this study, aqueous solutions with and without ozone saturation as postharvest wash treatment at pH 4.0, 7.0, and 9.0 were tested to remove chlorothalonil from potatoes. The method used for pesticide analysis has been validated, presenting recovery values of 94–103%, with variations in the repeatability coefficients of ≤10.6%, and a quantification limit of 0.05 mg kg−1. Regardless of pH, treatment with aqueous ozone solutions removed 70–76% of the pesticide present in the potato. In the no-ozone treatments, the percentage average removal of chlorothalonil residues in potatoes was only 36%. Over 24 days of storage, the quality of potatoes washed with aqueous ozone solutions was not significantly different from those washed with pure water.

Hydrogen peroxide biosensor utilizing a hybrid nano-interface of iron oxide nanoparticles and carbon nanotubes to assess the quality of milk

2015 ◽  
Vol 215 ◽  
pp. 166-173 ◽  
Author(s):  
Kavitha Thandavan ◽  
Sakthivel Gandhi ◽  
Noel Nesakumar ◽  
Swaminathan Sethuraman ◽  
John Bosco Balaguru Rayappan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Peroxide ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Hydrogen Peroxide Biosensor ◽  
Quality Of Milk
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