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Carbonation Shrinkage01:24

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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
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Phenol-Derived Carbon Sealant Inspired by a Coalification Process.

Yunhan Lee1, Kiwoo Jun2, Kyueui Lee1

  • 1Department of Chemistry, KAIST, 291, Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.

Angewandte Chemie (International Ed. in English)
|November 26, 2019
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Summary

Researchers mimicked coalification to create conductive sealants from non-conductive phenolic compounds. This biomimetic adhesive offers enhanced conductivity for advanced material applications.

Keywords:
carbon sealantcoalificationgraphene sealingphenolic compound

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Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • Phenolic compounds are crucial in forming coal, a conductive carbonized material, through high-temperature coalification.
  • Emerging applications utilize phenolic molecules as surface functionalizing agents and bioadhesives.
  • Mimicking natural coalification offers a pathway to create novel conductive carbon materials.

Purpose of the Study:

  • To develop a method for converting non-conducting phenolic compounds into conductive carbon sealants.
  • To investigate the potential of biomimetic coalification for creating advanced sealing materials.
  • To explore applications of these conductive phenolic sealants in materials science.

Main Methods:

  • Heat treatment of a mixture of tri-hydroxybenzene (pyrogallol) and polyethylenimine.
  • Characterization of the resulting material's adhesive and conductive properties.
  • Evaluation of the material's performance as a sealant and binder.

Main Results:

  • The pyrogallol and polyethylenimine mixture formed an adhesive sealant that transformed into a conductive carbon material upon heat treatment.
  • The resulting phenolic sealant achieved a conductivity of approximately 850 Ω⁻¹ cm⁻¹, demonstrating a significant enhancement over existing carbon materials.
  • The material exhibited potential as a conducting defect sealant and binder for composite materials.

Conclusions:

  • Biomimetic coalification provides an effective route to synthesize conductive carbon sealants from non-conductive phenolic precursors.
  • The developed phenolic sealant offers superior conductivity and versatile applications in advanced materials.
  • This research opens avenues for utilizing sustainable, bio-inspired materials in electronics and composites.