Hydrogen Crystallization in Low-Density Aerogels

Kucheyev, S. O.; Cleve, E. Van; Johnston, Linda; Gammon, Stuart A.; Worsley, Marcus A.

doi:10.1021/la504384v

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…Aerogels have three-dimensional (3D) network structures constructed via connection of nanoparticles. More than 90% of the space in aerogels is occupied by air, and only a very limited amount of solid phase is present. , Because of the nanoporous structure, aerogels have various unique properties, such as low density, high porosity, low thermal conductivity, high surface areas, and high acoustic attenuation. , In view of their unusual chemical and textural properties, aerogels have been investigated for a wide variety of applications, including thermal insulation, catalysis, catalyst support, adsorption, sensor, aerospace, and aeronautics. − …”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polyimide Aerogels with a Uniform Nanoporous Framework

Zhong¹,

Kong²,

Chen³

et al. 2018

Langmuir

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Polyimide (PI) aerogels were successfully synthesized via a straightforward sol-gel process under room temperature along with the supercritical CO drying method using 4-amino- N-methylbenzamide and 3,3',4,4'-biphenyltetracarboxylic dianhydride. 1,3,5-Triaminophenoxybenzene was used as the cross-linker. The chemical structure, pore structure, morphology, thermal performance, CO adsorption, and mechanical performance of PI aerogels were investigated. The as-prepared PI aerogels had low bulk densities (0.091-0.167 g/cm), low shrinkages (9.73-17.36%), low thermal conductivities (0.0307-0.0341 W/m·K), high specific surface areas (449.76-538.19 m/g), small pore diameter (10.37-22.41 nm), high thermal stability (onset of decomposition above 560 °C), and excellent mechanical property. The CO adsorption capacities of PI aerogels were substantially higher than the values of the previous porous materials reported under the similar conditions, and the CO uptake capacity was as high as 31.19 cm/g at 25 °C and 1.0 bar. The resulting PI aerogels could be potentially used as thermal insulators and CO adsorbents.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Polyimide Aerogels with a Uniform Nanoporous Framework

Zhong¹,

Kong²,

Chen³

et al. 2018

Langmuir

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Pore architecture of nanoporous gold and titania by hydrogen thermoporometry

Johnston

Biener

et al. 2015

Journal of Applied Physics

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Nanoporous gold (NPG) and materials derived from it by templating have complex pore architecture that determines their technologically relevant physical properties. Here, we apply high-resolution hydrogen thermoporometry to study the pore structure of NPG and NPG-derived titania nanofoam (TNF). Results reveal complex multimodal pore size distributions for NPG and TNF. The freezing–melting hysteresis is pronounced, with freezing and melting scans having entirely different shapes. Experiments involving partial freeze–melt cycles reveal the lack of direct correlation between individual freezing and melting peaks, pointing to phenomena that are beyond the Gibbs-Thomson formalism. The depression of the average freezing temperature scales linearly with the ratio of the internal surface area (measured by gas sorption) and the total pore volume derived from the density of monoliths. Thermoporometry yields total pore volumes in good agreement with those derived from monolith densities for both NPG and TNF.

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Effect of wetting on nucleation and growth of D2 in confinement

Zepeda-Ruiz

Sadigh

Shin

et al. 2018

The Journal of Chemical Physics

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We have performed a computational study to determine how the wetting of liquid deuterium to the walls of the material influences nucleation. We present the development of a pair-wise interatomic potential that includes zero-point motion of molecular deuterium. Deuterium is used in this study because of its importance to inertial confinement fusion and the potential to generate a superfluid state if the solidification can be suppressed. Our simulations show that wetting dominates undercooling compared to the pore geometries. We observe a transition from heterogeneous nucleation at the confining wall to homogeneous nucleation at the bulk of the liquid (and intermediate cases) as the interaction with the confining wall changes from perfect wetting to non-wetting. When nucleation is heterogeneous, the temperature needed for solidification changes by 4 K with decreasing deuterium-wall interaction, but it remains independent (and equal to the one from bulk samples) when homogeneous nucleation dominates. We find that growth and quality of the resulting microstructure also depends on the magnitude of liquid deuterium-wall interaction strength.

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Hydrogen Crystallization in Low-Density Aerogels

Cited by 4 publications

References 42 publications

Preparation and Characterization of Polyimide Aerogels with a Uniform Nanoporous Framework

Preparation and Characterization of Polyimide Aerogels with a Uniform Nanoporous Framework

Pore architecture of nanoporous gold and titania by hydrogen thermoporometry

Effect of wetting on nucleation and growth of D2 in confinement

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