Porosity characterization of aerogels using positron annihilation lifetime spectroscopy

Mincov, I.; Petkov, Mihail P.; Tsou, P.; Troev, T.

doi:10.1016/j.jnoncrysol.2004.06.024

Cited by 17 publications

(7 citation statements)

References 24 publications

(37 reference statements)

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“…The positron lifetime, number of annihilation photons, and electron momentum are measured by different experimental techniques, and used to deduce different porosity characteristics (Schultz and Lynn, 1988;Puska and Nieminen, 1994). Lately Mincov et al (2004) utilized positron annihilation lifetime spectroscopy (PALS) for non-destructive characterization of porosity in aerogels.…”

Section: 1mentioning

confidence: 99%

Silica aerogel; synthesis, properties and characterization

Dorcheh

Abbasi

2008

Journal of Materials Processing Technology

1,132

335

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Section: 1mentioning

confidence: 99%

Silica aerogel; synthesis, properties and characterization

Dorcheh

Abbasi

2008

Journal of Materials Processing Technology

1,132

335

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“…[30] Ueno et al [31] utilized PALS to quantify the <10 Å pores within the mesoporous silica SBA-15, linking selectivity of benzene to toluene to this previously unreliably measured property. They also utilized N 2 adsorption to measure mesopore (>20 Å ) size of the same material.…”

mentioning

confidence: 99%

Exposing the Molecular Sieving Architecture of Amorphous Silica Using Positron Annihilation Spectroscopy

et al. 2008

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“…37,38 Additionally, it has been successfully applied in silica aerogels. 39 A comprehensive understanding of the nanoporous structure of nano-SCEs was acquired by combining the results of PALS with SEM, TEM, and N 2 adsorption/desorption measurements. All the PALS results are presented in the Supporting Information.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Interfacial Conductivity Enhancement and Pore Confinement Conductivity-Lowering Behavior inside the Nanopores of Solid Silica-gel Nanocomposite Electrolytes

Sagara

Yabe

Chen

et al. 2021

ACS Appl. Mater. Interfaces

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Solid nanocomposite electrolytes (nano-SCEs) that exhibit higher ionic conductivity than the individual confined electrolyte were investigated for high-performance solid-state batteries. Understanding the behavior of Li-ion conduction through the pores is important to design ideal nanoporous structures for nano-SCEs, which are composed of an ionic liquid electrolyte (ILE) in a highly porous (∼90%) silica matrix. To establish the relationship between the pore structure of the silica matrix and the ionic conductivity of the solid nanocomposite, the liquid electrolyte fraction was successfully extracted from the nano-SCE to reveal the fragile porous silica matrix. A careful drying using the CO 2 supercritical drying method helps in sustaining the original structure, preventing its collapse due to surface tension. The pore size distribution, Brunauer−Emmett−Teller (BET) surface area, and porosity were characterized using scanning electron microscopy, transmission electron microscopy, and N 2 adsorption/desorption techniques. Our results revealed a wide size distribution of macropores and mesopores in the silica matrix. The pore size increased and the effective surface area decreased with increasing ILE/SiO 2 molar ratio. The interface conductivity enhancement was found to increase with the thickness of the adsorbed (ice-like) bound-water layer on the silica surface, confirming that the strong hydrogen bonding of the adsorbed ionic liquid molecules on the bound-water layer causes the conduction promotion effect in the nano-SCE. In addition, a large number of small pores lead to a severe pore confinement effect that results in a decreased conductivity due to the increasing viscosity of the ILE filling the pores. The conductivity can be improved by realizing a nano-SCE with an optimized pore size to minimize the pore confinement effect.

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Porosity characterization of aerogels using positron annihilation lifetime spectroscopy

Cited by 17 publications

References 24 publications

Silica aerogel; synthesis, properties and characterization

Silica aerogel; synthesis, properties and characterization

Exposing the Molecular Sieving Architecture of Amorphous Silica Using Positron Annihilation Spectroscopy

Interfacial Conductivity Enhancement and Pore Confinement Conductivity-Lowering Behavior inside the Nanopores of Solid Silica-gel Nanocomposite Electrolytes

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