Investigations of van der Pauw method applied for measuring electrical conductivity of electrolyte solutions

Moron, Z.

doi:10.1016/s0263-2241(02)00079-9

Cited by 25 publications

(8 citation statements)

References 10 publications

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“…The obtained data at room temperature and atmospheric pressure were analyzed using equation (3), where the correction factor f has been neglected due to the symmetry of the measurement cell as discussed in the introduction. The validity of the applied method has been proven by Moroń [12]. The value for Z CA,DB was determined at the beginning of a measurement sequence, and the ratio Z CA,DB_STP /Z AB,CD_STP , which is assumed temperature independent, is used to calculate the conductivity over the entire temperature range without further electrode rotating, by making use of equation (4).…”

Section: Conductivity Measurement Setupmentioning

confidence: 99%

Electrical conductivity measurements of aqueous and immobilized potassium hydroxide

Allebrod

Chatzichristodoulou

Mollerup

et al. 2012

International Journal of Hydrogen Energy

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It is important to know the conductivity of the electrolyte from a alkaline electrolysis cell at a given temperature and concentration to reduce the polarization loss during electrolysis through optimal cell and system design. The conductivity of aqueous KOH at elevated temperatures and high concentrations was investigated using the van der Pauw method in combination with electrochemical impedance spectroscopy (EIS). Conductivity values as high as 2.7 S·cm -1 for 35 wt%, 2.8 S·cm -1 for 45wt%, and 2.8 S·cm -1 for 55 wt% concentrated aqueous solutions were measured at 200 °C. Micro-and nano-porous solid pellets were produced and used to immobilize aqueous KOH solutions. These are intended to operate as ion-conductive diaphragms (electrolytes) in alkaline electrolysis cells, offering high conductivity and corrosion resistance. The conductivity of immobilized KOH has been determined by the same method in the same temperature and concentration range. Conductivity values as high as 0.67 S·cm -1 for 35 wt%, 0.84 S·cm -1 for 45 wt%, and 0.73 S·cm -1 for 55 wt% concentrated immobilized aqueous solutions were determined at 200 °C. Furthermore, phase transition lines between the aqueous and aqueous + gaseous phase of aqueous KOH were calculated as a function of temperature, concentration and pressure in the temperature range of 100-300 °C, for concentrations of 0-80 wt% and at pressures between 1 and 100 bar.

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Section: Conductivity Measurement Setupmentioning

confidence: 99%

Electrical conductivity measurements of aqueous and immobilized potassium hydroxide

Allebrod

Chatzichristodoulou

Mollerup

et al. 2012

International Journal of Hydrogen Energy

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“…Although the designed probe has been suggested for internal body tissues, such as measuring the electrical properties of the lung tissue during the bronchoscopy procedure, it is useful to compare its efficiency with other methods such as the non‐invasive four electrode array [19] and van der Pauw [20]. The reason for choosing these two methods is that they have been used experimentally and approved by different researchers [21, 22]. In this comparison, we consider the living tissue as a cube‐shaped structure with dimensions

50 mm \times 50 mm \times 30 mm

.…”

Section: Resultsmentioning

confidence: 99%

Small‐sized probe for local measuring electrical properties of the tissues inside of human body: design, modelling and simulation

Baghbani

2019

IET nanobiotechnol.

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In this study, a new idea is suggested for designing an appropriate bio-impedance probe in the form of a biopsy forceps to measure the electrical properties of the tissues inside the body. First, by analytically solving the Laplace equation for wedge-shaped tissue in the mouth of the probe, the relationship between electric potential (results from excitation current) in a different point on the tissue and the electrical properties of the tissue is obtained. Then, to evaluate the designed bio-impedance probe using the finite element method and the experimental data obtained for different tissues by Gabriel et al., modelling and simulation at different frequencies from 50 Hz to 5 MHz were done. Finally, to evaluate the performance of the designed probe in comparison to other methods, measurements were carried out using three methods for the same tissue. Nyquist curves were drawn and electrical properties extracted for all the three methods. It was found that the designed probe results are close to the actual values with an error of <2%. The main features of the designed probe are small size and non-invasive measurement.

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“…Moron showed that the van der Pauw's technique could measure the electrical resistivity of electrolyte solutions and applied this method to determine the electrical conductivity of a salt solution. [ 21 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Bioimpedance sensor to detect water content in milk based on van Der Pauw method

Ashoorirad

Baghbani

Ghalamboran

2021

IET Nanobiotechnology

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Milk fraud poses serious problems for the dairy industry and consumers' health. The main aim of this study was to reveal the effect of water added to milk by measuring its electrical impedance spectrum. The required sensor was designed based on the van der Pauw method to measure the electrical conductivity of milk at the frequency band of 10 Hz to 5 MHz. The bioimpedance spectrum of the milk of five different cows showed that the electrical impedance spectrum has a high potential for detecting water added to the milk (P < 0.01). The area under the Nyquist curve was introduced as a suitable index to detect water-added milk. In addition, the characteristic frequency of the bioimpedance spectrum was used as an important index to differentiate water-added milk from waterless milk. An electrical model was introduced to interpret the amount of water added to the milk using the characteristic frequency. Results showed that it is possible to detect raw milk from boiled milk by measuring its electrical impedance.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Investigations of van der Pauw method applied for measuring electrical conductivity of electrolyte solutions

Cited by 25 publications

References 10 publications

Electrical conductivity measurements of aqueous and immobilized potassium hydroxide

Electrical conductivity measurements of aqueous and immobilized potassium hydroxide

Small‐sized probe for local measuring electrical properties of the tissues inside of human body: design, modelling and simulation

Bioimpedance sensor to detect water content in milk based on van Der Pauw method

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