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Related Concept Videos

Mortar01:29

Mortar

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Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
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Mortar Synthesis: A Mechanochemical Approach to Metal Aerogel Production.

Johannes Kresse1,2, Laura Uhlmann1, Annika Christiansen1

  • 1Physical Chemistry, TU Dresden, Zellescher Weg 19, 01069 Dresden, Germany.

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Summary

Researchers developed a novel mortar grinding method to rapidly synthesize diverse metal aerogels. This technique achieves high production rates and versatile material properties for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Metal aerogels combine nanoparticulate properties with macroscopic structure.
  • Their large specific surface area (SSA), conductivity, and electrocatalytic activity are key for applications.
  • High production rates are crucial for widespread adoption of metal aerogels.

Purpose of the Study:

  • To develop a high-throughput synthesis method for metal aerogels.
  • To expand the range of metals used in aerogel synthesis.
  • To investigate the influence of synthesis parameters on aerogel properties.

Main Methods:

  • A unique mortar grinding approach using mechanochemical activation.
  • High concentrations of metal precursors and sodium borohydride (NaBH4).
  • Subsequent completion of reduction by adding water.

Main Results:

  • Successful synthesis of aerogels from non-radioactive metals (Groups 8-11) and main group elements (In, Sb, Pb, Bi) and their bimetals.
  • Achieved SSAs ranging from 2 to 70 m²/g and ligament sizes of 2-140 nm.
  • Demonstrated tunable morphology of iron aerogels using magnetic fields and achieved rapid gelation times.

Conclusions:

  • The mortar grinding method enables rapid, versatile, and scalable synthesis of diverse metal aerogels.
  • This approach overcomes previous limitations in metal aerogel production rates and material scope.
  • The synthesized metal aerogels offer tunable properties for various advanced applications.