scholarly journals Impedance spectroscopy, electrical relaxation and Ac conductivity studies of organic-inorganic hybrid compound: NH3(C6H4)2NH3HgCl4

2011 ◽  
Vol 7 (2) ◽  
pp. 1348-1358 ◽  
Author(s):  
W. Wamani ◽  
N. Hannachi ◽  
T. Mhiri ◽  
M. Belhouchet
Keyword(s):  
Phase Transition ◽  
Impedance Spectroscopy ◽  
Equivalent Circuit ◽  
Ac Conductivity ◽  
Equivalent Circuit Model ◽  
Electrical Impedance Spectroscopy ◽  
Electrical Measurements ◽  
Scanning Calorimetry ◽  
Hybrid Compound ◽  
Inorganic Hybrid

Organic–inorganic hybrid sample NH3(C6H4)2NH3HgCl4 was characterized by differential scanning calorimetry (DSC), TGA analysis and electrical impedance spectroscopy. DSC studies indicated the presence of a one-phase transition at 391 K. As for the ac conductivity of the compound NH3(C6H4)2NH3HgCl4, it has been measured in the temperature range of 358 - 413K and the frequency range of 209 Hz–5 MHz. Concerning the Z’ and Z’’ versus frequency plots, they were well-fitted to an equivalent circuit model. The equivalent circuit is composed of a series of combination of two parallel (R//CPE) circuits. Besides, the frequency dependence of the conductivity was interpreted in terms of Jonscher's law σ(ω) = σdc +A ωn.  As regards the conductivity, it follows the Arrhenius relation. The variation of the value of the conductivity with temperatures confirmed the availability of the phase transition at 391K detected by DSC and electrical measurements.

scholarly journals Towards optimization of plant cell detection in suspensions using impedance-based analyses and the unified equivalent circuit model

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kian Kadan-Jamal ◽  
Aakash Jog ◽  
Marios Sophocleous ◽  
Julius Georgiou ◽  
Adi Avni ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Equivalent Circuit ◽  
Cell Lines ◽  
Electrical Impedance ◽  
Equivalent Circuit Model ◽  
Plant Cells ◽  
Circuit Model ◽  
Electrical Impedance Spectroscopy ◽  
Impedance Spectra

AbstractAn improved approach for comparative study of plant cells for long term and continuous monitoring using electrical impedance spectroscopy is demonstrated for tomato and tobacco plant cells (MSK8 and BY2) in suspensions. This approach is based on the locations and magnitudes of defining features in the impedance spectra of the recently reported unified equivalent circuit model. The ultra-wide range (4 Hz to 20 GHz) impedance spectra of the cell lines were measured using custom probes, and were analyzed using the unified equivalent circuit model, highlighting significant negative phase peaks in the ~ 1 kHz to ~ 10 MHz range. These peaks differ between the tomato and tobacco cells, and since they can be easily defined, they can potentially be used as the signal for differentiating between different cell cultures or monitoring them over time. These findings were further analysed, showing that ratios relating the resistances of the media and the resistance of the cells define the sensitivity of the method, thus affecting its selectivity. It was further shown that cell agglomeration is also an important factor in the impedance modeling in addition to the overall cell concentration. These results can be used for optimizing and calibrating electrical impedance spectroscopy-based sensors for long term monitoring of cell lines in suspension for a given specific cell and media types.

scholarly journals Phase transition and switchable dielectric behaviours in an organic–inorganic hybrid compound: (3-nitroanilinium) 2 (18-crown-6) 2 (H 2 PO 4 ) 2 (H 3 PO 4 ) 3 (H 2 O)

2018 ◽  
Vol 5 (10) ◽  
pp. 180738 ◽  
Author(s):  
Yang Liu ◽  
Chun-li Zhu ◽  
Xiao-yuan Zheng ◽  
Liu-lei Qin ◽  
Shuang-xi Yang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Nitro Group ◽  
Dielectric Material ◽  
Variable Temperature ◽  
Three Dimensional ◽  
Dielectric Anisotropy ◽  
Scanning Calorimetry ◽  
Hybrid Compound ◽  
Inorganic Hybrid ◽  
Reversible Phase Transition

An organic–inorganic hybrid compound with an extensive three-dimensional (3D) crystal structure, (3-nitroanilinium) 2 (18-crown-6) 2 (H 2 PO 4 ) 2 (H 3 PO 4 ) 3 (H 2 O) ( 1 ), was synthesized under slow evaporation conditions. Differential scanning calorimetry measurements indicated that 1 underwent a reversible phase transition at ca 231 K with a hysteresis width of 10 K. Variable-temperature X-ray single-crystal diffraction revealed that the phase transition of 1 can be ascribed to coupling of pendulum-like motions of its nitro group with proton transfer in O–H···O hydrogen bonds of the 3D framework. The temperature dependence of its dielectric permittivity demonstrated a step-like change in the range of 150–280 K with remarkable dielectric anisotropy, making 1 a promising switchable dielectric material. Potential energy calculations further supported the possibility of dynamic motion of the cationic nitro group. Overall, our findings may inspire the development of other switchable dielectric phase transition materials by introducing inorganic anions into organic–inorganic hybrid systems.

scholarly journals Impedance Spectroscopy, Electrical Relaxation and Ac Conductivity Studies of an Organic-Inorganic Hybrid Compound: C12H14N2CuCl4

2009 ◽  
Vol 5 (3) ◽  
pp. 741-752 ◽  
Author(s):  
W. Wamani ◽  
R. Elwej ◽  
T. Mhiri ◽  
Mohamed Belhouchet
Keyword(s):  
Ac Conductivity ◽  
Arrhenius Equation ◽  
Constant Phase Element ◽  
Equivalent Circuit Model ◽  
Relaxation Model ◽  
Frequency Range ◽  
Scanning Calorimetry ◽  
Bulk Resistance ◽  
Hybrid Compound ◽  
Translation Motion

The AC conductivity of the compound, C12H14N2CuCl4, in the temperature and frequency range from 373 to 423 K and 209 Hz – 5 MHz, respectively, is reported. The differential scanning calorimetry and thermogravimetric analysis indicate the presence of a phase transition at 400 K. The Z’ and Z’’ vs. frequency plots are found to be well fit by using the equivalent circuit model. The circuits consist of a parallel combination of bulk resistance Rp and constant phase element. Besides, the analysis of the experimental data based on the jump relaxation model shows that the translation motion of the charge carrier and reorientation hopping between the equivalent sites of the metal chloride anion and the cation groups are responsible for the observed AC conductivity in the temperature regions I (373–400 K) and II (400–423 K). The frequency dependence of the conductivity which follows the Arrhenius equation is interpreted in terms of Jonscher's law: σ (ω) = σdc +A ω S. 

A single layered organic-inorganic hybrid compound [(FBMA)2PbBr4] with reversible phase transition and intense fluorescent property

2019 ◽  
Vol 270 ◽  
pp. 226-230 ◽  
Author(s):  
Yanhuan Hao ◽  
Shuyao Wen ◽  
Jiaojiao Yao ◽  
Zhenhong Wei ◽  
Xiuxiu Zhang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Fluorescent Property ◽  
Hybrid Compound ◽  
Inorganic Hybrid ◽  
Reversible Phase Transition ◽  
Reversible Phase

Investigation of a Li-O2 cell featuring a binder-free cathode via impedance spectroscopy and equivalent circuit model analysis

2013 ◽  
Vol 34 ◽  
pp. 77-80 ◽  
Author(s):  
Ruben Nelson ◽  
Mark H. Weatherspoon ◽  
Jamie Gomez ◽  
Egwu E. Kalu ◽  
Jim P. Zheng
Keyword(s):  
Impedance Spectroscopy ◽  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Model Analysis ◽  
Circuit Model ◽  
Binder Free

Structure and characterization of the phase transition of the new organic–inorganic hybrid compound [C8H10NO]2[ZnCl4]

Polyhedron ◽  
2015 ◽  
Vol 85 ◽  
pp. 41-47 ◽  
Author(s):  
M. Amine Fersi ◽  
I. Chaabane ◽  
M. Gargouri ◽  
Alain Bulou
Keyword(s):  
Phase Transition ◽  
Hybrid Compound ◽  
Inorganic Hybrid
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