Hollow ferromagnetic powders of iron were obtained by means of ultrasonic spray pyrolysis. A variation in the conditions of the synthesis allows for the adjustment of the mean size of the hollow iron particles. Iron powders were obtained by this technique, starting from the aqueous solution of iron nitrate of two different concentrations: 10 and 20 wt.%. This was followed by a reduction in hydrogen. An increase in the concentration of the solution increased the mean particle size from 0.6 to 1.0 microns and widened particle size distribution, but still produced hollow particles. Larger particles appeared problematic for the reduction, although admixture of iron oxides did not decrease the microwave permeability of the material. The paraffin wax-based composites filled with obtained powders demonstrated broadband magnetic loss with a complex structure for lesser particles, and single-peak absorption for particles of 1 micron. Potential applications are 5G technology, electromagnetic compatibility designs, and magnetic field sensing.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9029975 | PMC |
| http://dx.doi.org/10.3390/s22083086 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
PVP-assisted MOF-derived FeO/C powders for microwave absorption applications.
Heliyon
January 2025
School of Metallurgy & Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran.
Metal-organic framework (MOF) derived porous FeO/C powders were applied for absorption of microwaves in the frequency range of 1-18 GHz. The effects of the polyvinylpyrrolidone (PVP) additive on the synthesis of MIL101-(Fe) precursor were studied by various characterization methods. By adding PVP, the impure hematite phase (α-FeO) with magnetite phase (FeO) was disappeared and the particular morphology was transformed to the porous rod-like, leading to the increase of specific surface area from 150 to 282 m/g.
View Article and Find Full Text PDFGrain size modulation to optimize the wave-absorbing properties of FeSiCr alloy micropowder.
Phys Chem Chem Phys
December 2024
College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, 341000, P. R. China.
In this paper, the ball-milled flake FeSiCr alloy is subjected to a vacuum annealing temperature between 300 and 500 °C. The results show that the appropriate heat treatment temperature increases the average grain size of the material, eliminates defects and internal stresses, and improves the complex permeability of the material. The optimum wave-absorbing performance of the material is achieved when the heat treatment temperature is 400 °C with the minimum reflectivity RL reaching -56.
View Article and Find Full Text PDFAdditional sources of salinity and heavy metals from plant residues of peaty horizons in the Po River lowland (Italy).
Sci Total Environ
December 2024
SIMAU - Department of Materials, Environmental Sciences and Urban Planning, Polytechnic University of Marche, Via Brecce Bianche 12, 60131 Ancona, Italy. Electronic address:
Article Synopsis
- The Po River lowland in Italy is experiencing soil and water salinization due to saline groundwater seepage, primarily influenced by paleo-saline porewaters in soil layers.
- A 2-hectare agricultural field, located below sea level and facing reduced crop yields, was studied using soil samples to analyze salinity levels and water availability.
- Findings revealed an average porewater salinity of 8.2 g/L, with connections between trace elements and saline soil layers, and suggested that plant tissue fragments could be a long-term source of salinization, overlooked in previous studies.
Numerical simulation of the physical response of shale oil reservoirs under microwave and steam synergy and single heating methods.
Sci Rep
November 2024
School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, China.
This article is the first to simulate the changes in temperature, porosity, permeability, and displacement of oil shale reservoirs under microwave followed by steam and steam followed by microwave and to analyze the oil shale reservoirs under single steam and microwave in comparison, aiming to find out the most suitable way for in-situ exploitation of oil shale among the four types of heating methods. From the results of COMSOL Multiphysics field software, the average temperatures of the reservoir under 600 W single microwave heating, 650 °C single steam heating, steam followed by microwave heating, and microwave followed by steam heating were 570.15, 528.
View Article and Find Full Text PDFMicrowave-assisted, sulfhydryl-modified β-cyclodextrin-silymarin inclusion complex: A diverse approach to improve oral drug bioavailability via enhanced mucoadhesion and permeation.
Carbohydr Polym
January 2025
College of Pharmacy, University of Sargodha, 40100 Sargodha, Pakistan. Electronic address:
The current study aimed to generate a sulfhydryl-modified β-cyclodextrin-silymarin complex (sulfhydryl-modified β-CD-SMN complex) and to evaluate the enchantment in solubility, permeability, and bioavailability of a model BCS Class IV drug silymarin (SMN). For this purpose, sulfhydryl-modified β-CD was synthesized by replacing all primary and secondary -OH groups at the β-CD backbone with sulfhydryl groups via a novel microwave-assisted technique. Afterward, sulfhydryl-modified β-CD was complexed with silymarin and characterized by FTIR and H NMR spectroscopy.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!