Application of the standard porosimetry method for nanomaterials

Volfkovich, Yury M.; Sakars, A.; Volinsky, Alex A.

doi:10.1504/ijnt.2005.008066

Cited by 55 publications

(18 citation statements)

References 9 publications

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“…Further, the SSA in the present study is defined as the pore surface area divided by the cross‐sectional area as shown in Equation , which is 8652, while the mean pore size is 73 nm (obtained via Equation based on the pores larger than 3.2 nm). It should be noted that 3.2 nm is used as the r min because it is the lower limit at which the pore size can be measured with reasonable accuracy; this is a limit due to the equipment and the measurement technique involved . Therefore, for the present study, the pore surface area calculated from the small pores (ranging from 0 to 3.2 nm) is unreliable, and these pores are excluded in the calculation of the total pore surface area.…”

Section: Resultsmentioning

confidence: 99%

“…The electrode pore structure is investigated by the MSP . The MSP is established based on the phenomena of capillary pressure equilibrium in porous media.…”

Section: Methodsmentioning

confidence: 99%

“…The capillary pressure, p c , can be obtained from the Young‐Laplace equation:

p_{c} = - \frac{2 σ cos θ}{r_{m}}

where r m is the maximum radius of the pores filled with liquid, σ denotes the surface tension, and θ is the contact angle. The substitution of Equation into yields the relation between V t and r m as follows,

V_{t} = f_{V} ([], f_{s} ((), - \frac{2 σ cos θ}{r_{m}})) = F ((),, θ, r_{m})

…”

Section: Methodsmentioning

confidence: 99%

“…The microscopy techniques usually rely on image‐processing algorithms and measure the pores particularly near the surface. The method of standard porosimetry (MSP), established by Volfkovich et al based on the theory of capillary equilibrium in porous media, is able to measure a broad range of pores (0.3 nm‐300 μm) without damaging the tested sample. It should be noted that the Brunauer‐Emmett‐Teller (BET) theory based on the phenomena of gas adsorption is advantageous for the measurement of pore surface area, which is also employed in this study.…”

Section: Introductionmentioning

confidence: 99%

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Geometric pore surface area and fractal dimension of catalyzed electrodes in polymer electrolyte membrane fuel cells

et al. 2018

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Summary Geometric pore surface area is a significant parameter for the description of the irregular, somewhat random, porous structure of the catalyzed electrodes in polymer electrolyte membrane (PEM) fuel cells; however, its value is sensitive to the experimental methods employed, which necessitates the measurements via different methods. In this study, the geometric surface area of the porous electrode is determined by two different methods: the method of standard porosimetry (MSP) and Brunauer‐Emmett‐Teller (BET). The theory of fractal dimension is employed to analyze the data obtained from the MSP, and the fractal surface area calculated using nitrogen molecules as the scale is compared with the BET surface area. The results indicate that the geometric pore surface area is a property of the porous electrode that depends greatly on the “scale” size (ie, molecule size of the working fluid)—a smaller scale yields a larger value of the surface area. The surface area determined by the BET is found to be about one order of magnitude larger than that obtained by the MSP. Thus, the fractal dimension theory based on MSP demonstrates a useful tool to determine the accessible pore surface area at different length scales.

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Section: Resultsmentioning

confidence: 99%

“…The electrode pore structure is investigated by the MSP . The MSP is established based on the phenomena of capillary pressure equilibrium in porous media.…”

Section: Methodsmentioning

confidence: 99%

“…The capillary pressure, p c , can be obtained from the Young‐Laplace equation:

p_{c} = - \frac{2 σ cos θ}{r_{m}}

V_{t} = f_{V} ([], f_{s} ((), - \frac{2 σ cos θ}{r_{m}})) = F ((),, θ, r_{m})

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geometric pore surface area and fractal dimension of catalyzed electrodes in polymer electrolyte membrane fuel cells

et al. 2018

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“…The aim of this work is thus to assess the kinetic parameters for the exchange of d metal ions on compositional ion exchangers. These materials have also been investi gated by standard contact porometry, which allows determination of pore size over a wide range [6,7] and provides important information on the porous struc ture of a swollen polymer [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of the porous structure of polymer on the kinetics of Ni2+ exchange on hybrid inorganic-organic ionites

Dzyazko

Пономарева

Volfkovich

et al. 2012

Russ. J. Phys. Chem.

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Hybrid organic-inorganic ion exchangers are obtained by incorporating amorphous zirconium hydrophosphate into the gel of strong acidic cation exchange resin. Hybrid organic-inorganic ion exchangers are obtained by modifying strong acidic cation exchange resin with amorphous zirconium hydrophosphate. The synthesized materials are studied by standard porometry contact. It is found that raising the inorganic component content to 34 wt % diminishes the microporosity of the samples and simultaneously enhances the of meso and macropore volume. Experiments establish that modification of a polymer matrix lowers the self diffusion coefficient of Ni 2+ from 8.1 × 10 -12 to 2.4 × 10 -12 -4.1 × 10 -12 m 2 s -1 ; nevertheless, an inorganic ion exchanger minimizes the inhibitory effect of co ions on the Ni 2+ → H + exchange rate. One possible mechanism for of filling of the matrix by with particles of zirconium hydrophosphate is discussed.

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Effect of Porosity on Ion Transport Through Polymers and Polymer-Based Composites Containing Inorganic Nanoparticles (Review)

Dzyazko¹,

Volfkovich²,

Perlova³

et al. 2019

Springer Proceedings in Physics

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Application of the standard porosimetry method for nanomaterials

Cited by 55 publications

References 9 publications

Geometric pore surface area and fractal dimension of catalyzed electrodes in polymer electrolyte membrane fuel cells

Geometric pore surface area and fractal dimension of catalyzed electrodes in polymer electrolyte membrane fuel cells

Effect of the porous structure of polymer on the kinetics of Ni2+ exchange on hybrid inorganic-organic ionites

Effect of Porosity on Ion Transport Through Polymers and Polymer-Based Composites Containing Inorganic Nanoparticles (Review)

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