DC conductivity percolation on drying moistened mesoporous silica SBA-15

Nowak, Józef; Dziob, Daniel; Rutkowska, Małgorzata; Chmielarz, Lucjan; Górska, Urszula; Sokołowska, Dagmara; Mościcki, Józef K.

doi:10.1016/j.micromeso.2014.11.032

Cited by 5 publications

(3 citation statements)

References 34 publications

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“…Alternatively, these values were much lower than the value of 1.725 [ 45 ] in three dimensions obtained by numerical calculations. However, such low values of the critical exponent for electrical conduction are not unusual, e.g., 0.91 for Aerosil 90 [ 46 ], 0.964 for SBA–15 [ 47 ], and 1.08 for hydrated yeast [ 48 ]. On the other hand, the critical exponent of the percolation probability is 0.4 [ 42 ], which was in good agreement with the critical exponent of electrical conduction obtained in this experiment.…”

Section: Resultsmentioning

confidence: 99%

Effect of Water Absorption on Electric Properties of Temperature-Resistant Polymers

Watanabe,

Kaneko,

Zhong

et al. 2024

Polymers

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The effects of water absorption on the electric resistivity and dielectric constant of polyimide (PI) and poly(ethylene terephthalate) (PET) were investigated, and the mechanism of deterioration in electrical insulation properties was discussed. The polyimides are poly(oxydianiline pyromellitimide) (PMDA–ODA) and poly(para-phenylene diamine biphenyltetracarboxydiimide) (BPDA–PDA). These polymer films were immersed in pure water for various immersion times at room temperature, and the water absorption ratio was evaluated. The electric resistance for these films was measured at room temperature using a high-resistance meter, and the dielectric constant at room temperature was measured using an LCR meter in a frequency range of 200 kHz to 2 MHz. The absorption ratios at equilibrium absorption for PMDA–ODA, BPDA–PDA, and PET were 2.7, 2.5, and 0.5%, respectively. The critical volume fraction of the percolation threshold of electric conductivity due to water absorption was 0.034 for both PMDA–ODA and BPDA–PDA. On the other hand, PET did not show a significant decrease in the resistivity. For both PIs and PET, the dielectric constant observed could be explained by a series model of the respective capacitances of pure water and polymer. Actually, the resistivity of samples cut from the edges of the film after water absorption was almost the same value as that in the dry state. These results suggest that the absorbed water molecules are not uniformly dispersed in the film but are localized at the edges of the film even after the absorption equilibrium has been reached.

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Section: Resultsmentioning

confidence: 99%

Effect of Water Absorption on Electric Properties of Temperature-Resistant Polymers

Watanabe,

Kaneko,

Zhong

et al. 2024

Polymers

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“…In the course of further dehydration of the sample the amount of water decreases, which results in a further decrease in conductivity, until the 2D percolation threshold at which point the conductivity disappears. This is the last point at which we can observe the long-range connection of the water network [22,23]. In the examined system, the conductivity in the vicinity of the percolation threshold can be described by the relation:…”

Section: D Percolationmentioning

confidence: 87%

“…In this study we focus on conductivity percolation, which can be observed in porous and granular materials, including biological samples, in the course of their dehydration [16,[20][21][22][23]. In such systems conductivity is enabled by the presence of water molecules forming a water network.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Water network percolation on yeast as an experiment proposal for advanced physics laboratories for bioscience students

Dziob

Sokołowska

2020

Eur. J. Phys.

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Water is a crucial element of every living system, but its importance reaches further than biology. Thus, studying properties of water in different setups creates opportunities to bring together students of many disciplines. Here we propose a laboratory experiment on water network percolation in hydrated yeast, which enables description of the behavior of the water network surrounding living organisms during the dehydration process. Since the problem is interesting from a physical as well as biological point of view, the experiment can be introduced to student labs of both disciplines. In the experiment a simple RC circuit is used to observe 3D and 2D percolation phenomena in a sample of yeast. The parameters characterizing the phenomenon, such as percolation threshold and critical exponent, derived from the experimental data, provide information about the spatial organization of the water network surrounding yeast cells. The results obtained by four bioscience students using a simplified experimental setup are comparable with those presented in the literature and obtained by utilization of much more complex experimental methods.

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Investigation of the moisture classification and moisture removal behavior of diamond wire saw silicon powder waste cake

Han,

Yang,

Wei

et al. 2024

Journal of Materials Research and Technology

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DC conductivity percolation on drying moistened mesoporous silica SBA-15

Cited by 5 publications

References 34 publications

Effect of Water Absorption on Electric Properties of Temperature-Resistant Polymers

Effect of Water Absorption on Electric Properties of Temperature-Resistant Polymers

Water network percolation on yeast as an experiment proposal for advanced physics laboratories for bioscience students

Investigation of the moisture classification and moisture removal behavior of diamond wire saw silicon powder waste cake

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