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Tailoring Permeability of Microporous Copper Structures through Template Sintering.

Chi Zhang1, James W Palko1,2, Guoguang Rong1

  • 1Department of Mechanical Engineering , Stanford University , Stanford , California 94305 , United States.

ACS Applied Materials & Interfaces
|August 11, 2018
PubMed
Summary

Template-assisted electrodeposition significantly enhances hydraulic permeability in microporous copper by nearly an order of magnitude. This method improves fluid transport while maintaining substantial thermal conductivity for advanced material applications.

Keywords:
conductivitymicroporous copperpermeabilityporositysintering

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Fluid Dynamics

Background:

  • Microporous metals are crucial for applications requiring efficient convective and conductive transport.
  • Conventional fabrication methods like direct sintering yield limited control over pore morphology, hindering fluid transport properties.

Purpose of the Study:

  • To demonstrate control and improvement of hydraulic permeability in microporous copper structures.
  • To investigate the impact of template-assisted electrodeposition on fluid transport and thermal conductivity.

Main Methods:

  • Fabrication of microporous copper using template-assisted electrodeposition.
  • Modification of the fluid transport network through template sintering.
  • Measurement of hydraulic permeability and thermal conductivity.

Main Results:

  • Hydraulic permeability increased by nearly an order of magnitude.
  • Thermal conductivity decreased by approximately 38%.
  • Measured permeabilities ranged from 4.8 × 10-14 to 1.3 × 10-12 m2 for 5 μm pores, exceeding published values for sintered copper particles.

Conclusions:

  • Template sintering effectively modifies the fluid transport network, enhancing permeability.
  • Hydraulic permeability is limited by pore constrictions, sensitive to sintering conditions.
  • Electrodeposited microporous copper exhibits contrasting permeability-conductivity trends compared to sintered particles due to inverse structural relationships.