Tortuosity: A brief review

Silva, Marly Terezinha Quadri Simões da; Cardoso, Marianna do Rocio; Veronese, Caterina Maria Pabst; Mazer, Wellington

doi:10.1016/j.matpr.2022.02.228

Cited by 23 publications

(14 citation statements)

References 17 publications

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“…On the other hand, the bottom bulky layer has a spongy structure that acts as a scaffold and mechanical support for the adsorptive membrane. Furthermore, the presence of the less porous spongy structure expands the transport route of the aqueous media, increasing the tortuosity and hence improving the mass transfer between the targeted molecules and the membrane surface …”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the presence of the less porous spongy structure expands the transport route of the aqueous media, increasing the tortuosity and hence improving the mass transfer between the targeted molecules and the membrane surface. 29 Computed tomography (CT) imaging of the AOPIM membrane is shown in Figure 2h and Video S1 (Supporting Information), each representing the 3D image of the top layer, bottom layer, and cross-section of the membrane structure, respectively. The cross-section of the sample in the CT scan was consistent with the FE-SEM images, where a nonsymmetrical membrane structure was presented with a bulky active layer and a porous spongy supporting layer.…”

Section: Aopim Membrane With Structural Advantage For the Adsorptive ...mentioning

confidence: 99%

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Polymer of Intrinsic Microporosity Enabled pH-Responsive Adsorptive Membrane: Selectivity and Mechanism

Loh,

Burrows,

Zhang

et al. 2024

ACS Appl. Eng. Mater.

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We designed and fabricated a pH-responsive amidoxime-modified polymer of intrinsic microporosity (AOPIM) membrane for the selective separation of charged dyes under varying pH conditions. The membrane was fabricated using a nonsolvent-induced phase separation method with ethanol as the nonsolvent. By utilizing the amidoxime group as the selective affinity site, the AOPIM membrane manifested charge reversals, enabling high adsorption capacity, notably with methylene blue (MB) uptake reaching 444.2 mg g −1 . In dye filtration, it achieved substantial separation efficiencies for both anionic (IC: 94.7 L m −2 h −1 bar −1 ; 80% rejection) and cationic dyes (MB: 94.9 L m −2 h −1 bar −1 ; 99% rejection). Furthermore, the AOPIM membrane also possesses high separation selectivity for cationic dye in a dual dye mixture at a high pH environment. Results reported here underscore the unique pH-responsive properties of the AOPIM membrane, shedding light on the application of adsorptive membranes for pollution control.

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Section: Resultsmentioning

confidence: 99%

Section: Aopim Membrane With Structural Advantage For the Adsorptive ...mentioning

confidence: 99%

Polymer of Intrinsic Microporosity Enabled pH-Responsive Adsorptive Membrane: Selectivity and Mechanism

Loh,

Burrows,

Zhang

et al. 2024

ACS Appl. Eng. Mater.

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“…This means the volume fraction of ClPPO in the composite membrane is around 21.4%. Tortuosity describes the sinuosity of the pore space and influences flux transport in porous media 32,33 . In porous membranes, high tortuosity normally reflects a long transport path.…”

Section: Resultsmentioning

confidence: 99%

Robust poly(p‐phenylene oxide) anion exchange membranes reinforced with pore‐filling technique for water electrolysis

Feng,

Gupta,

Mamlouk

2024

J of Applied Polymer Sci

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Mechanical robustness and durability are crucial for anion exchange membranes to guarantee the longevity and consistent performance of AEM water electrolysis (AEMWE) systems. In this study, a composite membrane based on the quaternized poly(p‐phenylene oxide) (QPPO)/polytetrafluoroethylene (PTFE) was developed. This membrane was fabricated by enhancing the QPPO‐based AEM through a pore‐filling technique within a porous PTFE structure. The tensile strength of the composite membrane was increased significantly from 16.5 to 31 MPa. The conductivity of the composite membrane was 6.25 mScm−1 lower than 30 mScm−1 of the QPPO‐based membrane at 20°C, resulting from the low volume fraction of QPPO in the composite membrane. At 40% RH, the net change mass of the composite membrane is 1.59%, much lower than that of QPPO‐based membrane (10.98%) at 40°C. The composite membrane demonstrated a significantly increased lifetime in the working electrolyzer (>200 h) compared with an otherwise identical electrolyzer assembled with a QPPO‐based membrane (50 h).

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“…This is because the diffusion of cesium-137 is restricted by the smaller pore spaces, which limits the ability of the cesium-137 ions to move freely through the soil matrix. Other aspect is the tortuosity which is a term used to describe the sinuosity and interconnectedness of the pore space as it affects transport processes through porous media (Silva et al, 2022), these factors affect the diffusion coe cient of cesium-137. The denser soils or media tend to have smaller pores and fewer voids, which restrict the movement of particles through them (Chittoori et al, 2016) that makes the diffusion of cesium-137 through denser soils or media is slower than through less dense soils or media.…”

Section: Effect Of Materials Densitymentioning

confidence: 99%

Diffusion Capability of Cs-137 in Compacted Soil and Bentonite Under Groundwater-saturated Condition

Salma,

Ekaningrum,

Pratama

et al. 2023

Preprint

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Several researches have been studied the diffusion coefficient (Da) of radionuclide in soil samples in varies location around the world; however, the effect of cations in groundwater as a medium of saturation for Cs-137 diffusion in soil and bentonite remains to be accomplished. Compacted soil and bentonite layers are utilized in the construction of radioactive waste disposal sites, which serve to prevent the release of Cs-137 from the repository to the unsaturated zone. The samples used were soil from the prospective disposal site in SP4 – Serpong Nuclear Center (SNC) and bentonite taken from Santrijaya, Tasikmalaya. The diffusion coefficient (Da) is used as indicator of Cesium-137 diffusion in the samples. Experimental measurements were conducted on a diffusion column unit that varied in diffusion time and density conditions to determine diffusion coefficients. The samples were cut into slices and analyzed using Multichannel Analyzer (MCA) unit to measure Cs-137 radioactivity. The measurement results were then incorporated into Fick's Law equation to obtain the value of the diffusion coefficient (Da) of Cs-137 in soil and bentonite. The experimental results showed that the diffusion coefficients of samples with groundwater simulation are in the range of 10− 12 m2.s− 1 for the local soil and bentonite samples, respectively. Compare to the similar experiment that was conducted previously, the results indicated that the groundwater content could slightly impact the increase in the diffusion coefficient value of Cs-137.

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Tortuosity: A brief review

Cited by 23 publications

References 17 publications

Polymer of Intrinsic Microporosity Enabled pH-Responsive Adsorptive Membrane: Selectivity and Mechanism

Polymer of Intrinsic Microporosity Enabled pH-Responsive Adsorptive Membrane: Selectivity and Mechanism

Robust poly(p‐phenylene oxide) anion exchange membranes reinforced with pore‐filling technique for water electrolysis

Diffusion Capability of Cs-137 in Compacted Soil and Bentonite Under Groundwater-saturated Condition

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