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Magnetic Fe3O4/BiOBr for solar-light-responsive photodegradation of tetracycline antibiotic
(2026-07-01)
Detrat, Natthakitta
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Matsombat, Kanokwan
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Nonthing, Sattra
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Panchakeaw, Atchawadee
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Dulyasucharit, Ruethaithip
Magnetic Fe<inf>3</inf>O<inf>4</inf>/BiOBr photocatalyst was synthesized via an ultrasonic route. It was then applied for detoxification of tetracycline (TC) antibiotic. The prepared BiOBr exhibited E<inf>g</inf> of 2.71 eV while the binary Fe<inf>3</inf>O<inf>4</inf>/BiOBr showed E<inf>g</inf> of 2.04 eV. The Fe<inf>3</inf>O<inf>4</inf>/BiOBr photocatalyst displayed lower photoluminescence signal than BiOBr, suggesting the improvement of the electron-hole separation rate after creation of the magnetic Fe<inf>3</inf>O<inf>4</inf>/BiOBr photocatalyst. The promising photocatalytic efficiency of 100% was obtained. The corresponding enhanced rate constant of 0.0732 min<sup>−1</sup> was achieved. The synthesized Fe<inf>3</inf>O<inf>4</inf>/BiOBr exhibited the promising photocatalytic performance and the excellent structural stability after five cycles of use. The superoxide anion radicals are the main active species involved in the degradation of the pollutant. The present paper demonstrates a novel way to fabricate the sunlight-responsive photocatalyst, with magnetic separable property, for decontamination of TC drug in aqueous phase.
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Electric and magnetic properties of multiferroic CZFMO doped BNLTBKTBaT composite ceramics prepared via the solid-state combustion method
(2025-07-01)
Klinbanmor, Metarsit
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Thatawong, Bhoowadol
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Somsri, Widchaya
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Prasertpalichat, Sasiphon
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Vittayakorn, Naratip
The present research work describes in detail investigations of the multiferroic properties of (1-x) (0.85Bi<inf>0.5</inf>Na<inf>0.475</inf>Li<inf>0.025</inf>TiO<inf>3</inf>-0.11Bi<inf>0.5</inf>K<inf>0.5</inf>TiO<inf>3</inf>-0.04BaTiO<inf>3</inf>)-xCo<inf>0.6</inf>Zn<inf>0.4</inf>Fe<inf>1.7</inf>Mn<inf>0.3</inf>O<inf>4</inf> [(1-x)BNLTBKTBaT-xCZFMO]; x = 0, 0.05, 0.10, 0.15 and 0.20 composite ceramics, synthesized by the solid-state combustion technique. The effect of increasing x content on the phase structure, microstructure, electrical and magnetic properties of (1-x)BNLTBKTBaT-xCZFMO composite ceramics was investigated. X-ray diffraction patterns of the BNLTBKTBaT sample showed a pure perovskite phase (rhombohedral and tetragonal structures). When CZFMO was added, the XRD patterns showed a co-structure between perovskite and cubic spinel ferrite structures. The composite grains were composed of large and small sizes, which were composed of mainly the elements of BNLTBKTBaT and CZFMO, respectively. As x increased, the average grain size of the larger grains increased, and the smaller grains got smaller. The density decreased from 5.54 to 4.61 g/cm<sup>3</sup> as x increased. Increasing the amount of CZFMO in BNLTBKTBaT also resulted in a decrease in the dielectric constant (ε<inf>r</inf>) and the remnant polarization (P<inf>r</inf>), with the leakage current observed at x = 0.20. The saturation magnetization (M<inf>s</inf>) and the magnetoelectric coupling coefficient (α<inf>E</inf>) increased with increased x. It was found that x = 0.15 gave the optimal electric, magnetic, and magnetoelectric properties (ε<inf>r</inf> = 425, P<inf>r</inf> = 1.64 μC/cm, M<inf>s</inf> = 1.1948 emu/g and α<inf>E</inf> = 4.88 mV/cm-Oe), which makes the composite potentially more applicable for information technology and spintronics devices.
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A dual coil induction heating machine for jewelry factories developed by electromagnetic analysis
(2023-06-01)
Pattanapichai, Sorathorn
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Jansaengsuk, Thodsaphon
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Thongsri, Jatuporn
An induction heating machine (IHM) generates magnetic flux density (B) and high temperature for combining precious metals as products in a jewelry factory. Since factories require new generation IHMs for increased productivity and cost savings, a dual coil IHM development approach is presented here to replace conventional, single-coil IHM using electromagnetic analysis (EMA). First, the experiments and the EMA investigated B generated by a conventional one using the factory operating condition. Both agreed, confirming the methodology and reliability of the EMA, which was analyzed to determine B<inf>p</inf>. The B<inf>p</inf> represents a B property for the new dual coil IHM to be expected to generate a comparable signal to the single coil. Then, in development, two novel designs of dual coil IHM (series and parallel) were investigated based on current flow circuits. For these designs, B<inf>p</inf> was investigated using the EMA. As expected, the EMA results showed that both coils generated a different B<inf>p</inf>, which was unfortunately incompatible with the conventional IHM and thus was inappropriate in actual use. However, the series dual coil showed better applicability since it generated B higher than the parallel coil under the same operating conditions. Next, the EMA was applied to determine the B<inf>p</inf> of the series dual coil by varying the applied current (I), frequency (f), number of coil turns (N), and distance between coils (d). Finally, the EMA results revealed two options of the series dual coil with the optimum I, f, N, and d generating B<inf>p</inf> comparable to the conventional IHM, as intended, achieving the factory's need with two times the productivity.
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Analysis of liquids conductivity using hall effect sensor based on electromagnetic field properties
(2017-11-10)
Sokjabok, Siwakon
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Sriratana, Witsarut
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Satthamsakul, Sutham
This paper presents a new methodology of analyzing liquid conductivity via the Hall Effect sensor based on electrochemical properties. Two different magnetic field cores with the same coil length (10 m, AWG 31) were studied, namely ferrite solenoid cores and toroidal iron powder cores (T131-26). The magnetic field generated by both type of cores was then used to generate a Hall voltage with the cores ratios of 1 : 1. The output Hall voltage is, in turn, sent through a microcontroller, together with a 10 bit converter for real time data analysis. The magnetic-field density of the solenoid for analyzing the conductivity of brine is 31 mT for solenoid, and 10.74 mT for toroid cores, respectively. Results from other materials are compared to the reference conductivity values of salt solution, which amounts to 16.211 mS/cm when assessed with the solenoid core, and 16.406 mS/cm when assessed with the toroid core.
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Subsidence monitoring system for industrial machines based on magnetic field method
(2010-12-01)
Sriratana, Witsarut
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Nakmee, Kreangkrai
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Tanachaikhan, Lerdlekha
This study presents the design of subsidence monitoring system for industrial machine alignment based on magnetic field method. The system was developed to demonstrate the level of land subsidence in the area of the industrial machine located. A computer was used to collect the data and to display the angles of subsidence over operation period. The measurement module consists of two thin-and-curve permanent magnets (10 mm x 41.5 mm x 1.5 mm) with the outer radius of 24 mm, the curve angle of 120 degree, and the maximum magnetic density of 0.23 Tesla. The gap between these two magnets was 12 mm to generate the magnetic tension force. The sensing module was Hall Generator placed perpendicularly to the magnetic fluxes which can generate the output voltage as a function of subsidence angle and magnetic density on X axis and Z (vertical) axis with the resolution of 100 mV per degree. There were two ranges of measurement according to the angle resolution: -20 to 20 degree at 1 degree of resolution per step and -6 to 6 degree at 0.05 degree of resolution per step. ©ICROS.

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