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A Rapid Synthesis Method for Au, Pd, and Pt Aerogels Via Direct Solution-Based Reduction
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Hydrogen crystallization in low-density aerogels.

S O Kucheyev1, E Van Cleve1, L T Johnston1

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 18, 2015
PubMed
Summary
This summary is machine-generated.

Hydrogen (H2) freezing in nanoporous materials like aerogels shows depressed temperatures. This depression scales with surface area to pore volume ratio, not just pore size, impacting fusion energy applications.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Nanotechnology

Background:

  • Crystallization of liquids within nanoporous materials remains poorly understood.
  • Disordered, low-density nanoporous scaffolds present unique challenges for studying phase transitions.
  • Understanding confinement effects is crucial for applications like thermonuclear fusion energy.

Purpose of the Study:

  • To investigate the liquid-solid phase transition of hydrogen (H2) confined within various aerogels.
  • To determine the relationship between H2 freezing temperatures and the structural properties of nanoporous scaffolds.
  • To evaluate the applicability of existing theories like Gibbs-Thomson for confined H2 crystallization.

Main Methods:

  • Utilized relaxation calorimetry to precisely measure the liquid-solid phase transition of H2.
  • Employed a series of silica and carbon-based aerogels with high porosities (≳94%).
  • Measured internal surface area and pore volume using gas sorption techniques and aerogel density.

Main Results:

  • Observed depressed freezing temperatures for H2 in all studied aerogels.
  • Found that freezing temperature depression does not align with Gibbs-Thomson theory predictions based on average pore diameter.
  • Demonstrated a linear scaling of freezing temperature depression with the ratio of internal surface area to total pore volume for each aerogel type.

Conclusions:

  • The crystallization behavior of confined H2 is strongly influenced by the surface area to pore volume ratio, not solely by average pore size.
  • Differences in scaling slopes between silica and carbon aerogels are attributed to their distinct microporosity and macroporosity characteristics.
  • Findings offer improved methods for analyzing pore size distributions in low-density nanoporous materials and optimizing fuel layer crystallization for fusion energy.