The Percolation Properties of Electrical Conductivity and Permeability for Fractal Porous Media

Meng, Hongyu; Shi, Qiang; Liu, Tangyan; Liu, FengXin; Chen, Peng

doi:10.3390/en12061085

Cited by 16 publications

(9 citation statements)

References 50 publications

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“…We note that a high nanocellulose loading produced patches with an uneven conductivity, as measured in different areas of the structure, which is explained by the pores generated upon removal of water, as expected. [56] As shown in Table 1, The 5% 1:2 system presented an electrical conductivity of 34 mS cm −1 . This value is relatively lower than those measured for nanocellulose-PPy composites previously prepared from precursors such as hydrogels, sponges, and coatings (electrical conductivity in the range of ≈80-150 mS cm −1 ), suitable for paper-based energy storage devices and composites for nerve regeneration.…”

Section: Electrical Conductivity and Mechanical Propertiesmentioning

confidence: 96%

Multifunctional 3D‐Printed Patches for Long‐Term Drug Release Therapies after Myocardial Infarction

Ajdary

Ezazi

Correia

et al. 2020

Adv Funct Materials

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A biomaterial system incorporating nanocellulose, poly(glycerol sebacate), and polypyrrole is introduced for the treatment of myocardial infarction. Direct ink writing of the multicomponent aqueous suspensions allows multifunctional lattice structures that not only feature elasticity and electrical conductivity but enable cell growth. They are proposed as cardiac patches given their biocompatibility with H9c2 cardiomyoblasts, which attach extensively at the microstructural level, and induce their proliferation for 28 days. Two model drugs (3i-1000 and curcumin) are investigated for their integration in the patches, either by loading in the precursor suspension used for extrusion or by direct impregnation of the as-obtained, dry lattice. In studies of drug release conducted for five months, a slow in vitro degradation of the cardiac patches is observed, which prevents drug burst release and indicates their suitability for long-term therapy. The combination of biocompatibility, biodegradability, mechanical strength, flexibility, and electrical conductivity fulfills the requirement of the highly dynamic and functional electroresponsive cardiac tissue. Overall, the proposed cardiac patches are viable alternatives for the regeneration of myocardium after infarction through the effective integration of cardiac cells with the biomaterial.

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Section: Electrical Conductivity and Mechanical Propertiesmentioning

confidence: 96%

Multifunctional 3D‐Printed Patches for Long‐Term Drug Release Therapies after Myocardial Infarction

Ajdary

Ezazi

Correia

et al. 2020

Adv Funct Materials

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“…It is worth noting that critical pore diameter controls the conductive properties of a porous medium. Below the critical pore diameter, it is considered there is no electric current and fluid flow through the medium (Meng et al., 2019). The evolution of morphological descriptors can be related to the reactive process.…”

Section: Resultsmentioning

confidence: 99%

Chemically Induced Evolution of Morphological and Connectivity Characteristics of Pore Space of Complex Carbonate Rock via Digital Core Analysis

Qajar

Arns

2022

Water Resources Research

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We study the impact of reactive flow on a complex carbonate rock whose pore space was resolved by X‐ray μ‐CT. A small core plug was imaged in the original and chemically altered states. The morphology of the resolved pore space was quantified using various approaches, such as sample‐spanning cluster analysis, capillary drainage transform (CDT), and Minkowski functionals. In particular, we carefully evaluated the changes in macropore connectivity by calculating the fraction of percolated cluster, the Euler characteristic of macroporous phase, and the critical pore diameter in pre‐ and post‐alteration states. We observed that the reactive flow mainly affected larger pores in the macropore region of the sample. More importantly, a huge increase in macropore connectivity, as indicated majorly by the CDT measurements and the Euler characteristic, was observed such that the poorly connected original macropore phase was converted to well‐connected ones after the reactive flow. In addition, the increases in the macropore surface area and integral mean curvature indicated that the oomoldic and interooidal pores of the rock were dominantly enlarged by the reactive fluid. Based on direct numerical simulations on the main flow paths (i.e., the macro‐connected pore phase), strong correlations were found between changes in transport properties and the evolution of connectivity and length scales of the macropore phase, such that simple power‐law models could be used to predict with acceptable accuracy. This suggests that the evolution of transport properties of the rock was mainly controlled by the changes in the macro‐connected porosity and the critical pore diameter.

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“…However, Xiao et al (2018) did not consider irreducible water saturation and did not have much experimental data to validate the model for the relative permeability. Recently, Meng et al (2019) presented the models for both electrical conductivity and permeability based on fractal theory by introducing the critical porosity under saturated conditions. From obtained model, Meng et al (2019) could explain the fact that the permeability of porous media could approach to zero at a nonzero percolation porosity corresponding a certain critical pore diameter.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Meng et al (2019) presented the models for both electrical conductivity and permeability based on fractal theory by introducing the critical porosity under saturated conditions. From obtained model, Meng et al (2019) could explain the fact that the permeability of porous media could approach to zero at a nonzero percolation porosity corresponding a certain critical pore diameter. However, their model was validated by only two experimental data sets for the permeability as a function of porosity.…”

Section: Introductionmentioning

confidence: 99%

Predicting water flow in fully and partially saturated porous media: a new fractal-based permeability model

Jougnot

Thanh

et al. 2021

Hydrogeol J

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Predicting the permeability of porous media in saturated and partially saturated conditions is of crucial importance in many geo-engineering areas, from water resources to vadose zone hydrology or contaminant transport predictions. Many models have been proposed in the literature to estimate the permeability from properties of the porous media such as porosity, grain size or pore size. In this study, we develop a model of the permeability for porous media saturated by one or two fluid phases with all physically-based parameters using a fractal upscaling technique. The model is related to microstructural properties of porous media such as fractal dimension for pore space, fractal dimension for tortuosity, porosity, maximum radius, ratio of minimum pore radius and maximum pore radius, water saturation and irreducible water saturation. The model is favorably compared to existing and widely used models from the literature. Then, comparison with published experimental data for both unconsolidated and consolidated samples, we show that the proposed model estimate the permeability from the medium properties very well.

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The Percolation Properties of Electrical Conductivity and Permeability for Fractal Porous Media

Cited by 16 publications

References 50 publications

Multifunctional 3D‐Printed Patches for Long‐Term Drug Release Therapies after Myocardial Infarction

Multifunctional 3D‐Printed Patches for Long‐Term Drug Release Therapies after Myocardial Infarction

Chemically Induced Evolution of Morphological and Connectivity Characteristics of Pore Space of Complex Carbonate Rock via Digital Core Analysis

Predicting water flow in fully and partially saturated porous media: a new fractal-based permeability model

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