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Assessing the supercooling of fresh-cut onions at−5℃ using electrical impedance analysis

Food Quality and Safety 2020年第2期4卷 55-58页

作者： Shoji Koide Ami Yoneyama Takahiro Orikasa Matsuo Uemura Faculty of Agriculture Iwate UniversityMoriokaJapan Iwate Agri-Innovation Center Iwate UniversityMoriokaJapan

We supercooled fresh-cut onion at−5℃ for 12 *** supercooling,the electric impedance properties of the samples were evaluated by electrical impedance spectroscopy over the frequency range of 42 Hz−5 *** time-temperature profiles of samples indicated that the freezing point and supercooling point were−2.3℃±0.7℃ and−6.9℃±1.0℃,*** results indicated that 34 of the 36 supercooled samples exhibited a definite circular arc in the cole-cole plot,which suggested that the cell membrane remained intact during *** the other two samples which did not exhibit a definite circular arc,the cell membrane had sustained serious damage during ***,there was large difference in drip loss percentage between supercooled samples exhibited a definite circular arc in the cole-cole plot and samples not exhibiting a definite circular *** results suggest that fresh-cut onions can be supercooled at−5℃.

关键词： supercooling fresh-cut onion electrical impedance cole-cole plot supercooling point

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Electrical transport properties of V_(2)O_(5)-added Ni-Co-Zn ferrites

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Journal of Advanced Dielectrics 2021年第6期11卷 32-37页

作者： M.Firoz Uddin M.Samir Ullah S.Manjura Hoque F.A.Khan A.A.Momin Sm.Rubayatul Islam Faizus Salehin M.A.Hakim Department of Physics Bangladesh University of Engineering and Technology Dhaka 1000Bangladesh Department of Glass and Ceramic Engineering Bangladesh University of Engineering and Technology Dhaka 1000Bangladesh Materials Science Division Atomic Energy CenterDhaka 1000Bangladesh§Department of PhysicsJagannath UniversityDhaka 1100Bangladesh

Frequency-dependent dielectric constant,dielectric loss,AC conductivity values and complex impedance spectra of V_(2)O_(5)-added Ni-Co-Zn ferrites(Ni_(0.62)Co_(0.03)Zn_(0.35)Fe_(2)O_(4)+xV_(2)O_(5),where x=0,0.5,1 and 1.5 wt.%)have been investigated at room *** dielectric properties of the samples follow the Maxwell-Wagner polarization *** inverse relationship was found between dielectric constant and AC electrical resistivity for all the *** dielectric constants decreased with the addition of V_(2)O_(5),while the electrical resistivities of V_(2)O_(5)-added Ni-Co-Zn ferrites are found to be larger than that of pure Ni-Co-Zn *** AC conductivity was reduced with the addition of V_(2)O_(5)to Ni-Co-Zn ferrite at lower-frequency ***,AC conductivity shows a sharp increase at higher-frequency region,which could be attributed to the enhancement of electron hopping between the Fe2+and Fe3+ions in the ferrite matrix due to the activity of the *** complex impedance spectroscopy results through cole-cole/Nyquist plot have demonstrated a single semicircular *** indicates that conduction mechanism takes place predominantly through the grain/bulk property,which could be ascribed to the larger grain size of V_(2)O_(5)-added Ni-Co-Zn ferrites.

关键词： Dielectric constant electrical resistivity AC conductivity complex impedance cole-cole plot

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Study of Structural, Electrical and Magnetic Properties of Manganese Doped Cobalt Ferrite Nanoparticles with Non-stoichiometric Composition

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Journal of Physical Science and Application 2017年第6期7卷 30-37页

作者： M. Z. Ahsan F. A. Khan Department of Physics Military Institute of Science and Technology (MIST) Dhaka-1216 Bangladesh Department of Physics Bangladesh University of Engineering and Technology (BUET) Dhaka-1000 Bangladesh

The nanoparticles of Co1＋xMnxFe2-xO4 （0≤x ≤ 0.5） ferrite system are synthesized by solid-state reaction route using planetary ball milling technique to investigate structural, electrical and magnetic properties. The X-ray diffraction patterns confirm the inverse spinel structure with residual oxide phases. Three distinct regions of frequency response on dielectric constant are observed Co1.2sMn0.5Fe1.75O4 as determined by the Wayne Kerr Impedance Analyzer. The first two regions of frequency response 1.13-4.5 MHz and 4.5-6.5 MHz exhibit the normal behavior but the last region 6.5-10.5 MHz indicates its anomalous behavior due to concurrent contribution of O^2-, Fe^3＋, Co^2＋ and Mn^3＋ ions in the relaxation process for sintering effects （sintered at 700℃）. This anomalous behavior is found to be pronounced and significant for the sample of composition Co1.25Mn0.25Fe1.75O4, which may be suitable to be used in the frequency band filter over wide range of frequencies. The single peak of imaginary part of dielectric constant （ε＂） indicates that the conduction process in this sample is due to the grain boundary resistance. The pronounced increase of capacitance （C） as observed from 100 ℃ to 125 ~C in temperature dependent measurement （30-125℃） is expected to eause from the change of polarization across the grain boundary due to redistribution of ions by the thermal agitation. The variation of resistance （R） with temperature （30-125 ℃） is found to exhibit semieonducting behavior that resulted from the p-type carriers （Co^2＋/Co^3＋）. A significant increase of Z from 105 ℃ with the increase of temperature indicates the signature of phase transition from ferrimagnetic-to-ferromagnetic, which may be ascribed to the increase of Co content. The appearance of the single semicircular arc in the cole-cole plot may be attributed to the contribution of grain boundary resistance and correspond to the parallel equivalent circuit of resistor-capacitor （R-C） combination with single relaxatio

关键词： Cobalt ferrite dielectric constant capacitance resistance impedance cole-cole plot magnetization.

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