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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Engineering Precursor Localization via Solvency for Simultaneously Metallizing and Hollowing Bicontinuous Gyroid

Yuan Xiang1, Ahmed Gamal AboElsood1,2, Wei-Tsung Chuang3

  • 1Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan.

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Summary

Researchers developed a new method to create highly porous tungsten oxide (WO₃) hollow double gyroid (HG) nanonetworks. This technique precisely controls precursor distribution, enhancing porosity and structural integrity for advanced applications.

Keywords:
block copolymerdouble gyroidnanonetworkstemplated synthesistungsten oxide

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Area of Science:

  • Materials Science and Engineering
  • Nanotechnology
  • Chemistry

Background:

  • Metallized ordered porous nanonetworks exhibit superior performance due to interconnected frameworks and large surface areas.
  • Enhancing porosity in these nanonetworks while maintaining structural integrity presents a significant challenge.
  • Simultaneous hollowing and metallization are key to achieving higher porosity, requiring precise control over guest precursor distribution.

Purpose of the Study:

  • To develop a method for simultaneously metallizing and hollowing double gyroid (DG) structures into tungsten oxide (WO₃) hollow double gyroid (HG) architectures.
  • To overcome challenges in maintaining structural integrity during porosity enhancement.
  • To precisely control the distribution of metallic precursors within block copolymer frameworks.

Main Methods:

  • Utilized polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP) block copolymers to create DG hybrid structures.
  • Leveraged the ionization of P4VP and solvency of metallic precursors for controlled precursor association (homogeneous or heterogeneous).
  • Employed sequential calcination to simultaneously metallize and hollow the hybrid structures into crystalline WO₃-based HG architectures.

Main Results:

  • Achieved precise control over precursor distribution, leading to either homogeneous dispersion or heterogeneous localization at interfaces.
  • Demonstrated the formation of a unique core-shell triclinic DG hybrid structure via heterogeneous localization.
  • Successfully synthesized crystalline WO₃-based HG structures with exceptional porosity through simultaneous metallization and hollowing.

Conclusions:

  • The developed method effectively engineers precursor distribution to create highly porous nanonetworks with maintained structural integrity.
  • This approach is versatile and applicable to other amphiphilic copolymer-derived nanonetworks.
  • The synthesized WO₃-based HG architectures hold promise for advanced applications in nanopatterning, metamaterials, and catalysis.