A study on the properties of Zr-doped γ-Al2O3 xerogels hybridized with α-Al2O3 whiskers synthesized by solvothermal drying

In Keun Jung, Tae Jung Ha, Hyung-Ho Park, Si Jung Park, Doo Jin Choi, Seungsu Baek

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Hydrophobic zirconium doped alumina xerogels and zirconium doped alumina xerogels hybridized with α-Al2O3 whisker were fabricated by Si(CH3)3 (trimethylsilyl substituent) modification of alcogels via ambient pressure solvothermal drying procedure. One-step solvent exchange and surface modification were simultaneously progressed by immersing alumina alcogels in hexamethyldisilazane/hexane solution. The synthesized Zr doped Al2O3 xerogels have shown increased phase transition temperature from γ-phase to α-phase over 200°C. Although phase transition temperature was increased, the porous structure of Zr-doped Al2O3 xerogel was collapsed over 1200°C losing its specific surface area. To maintain their porous structures at the elevated temperatures, the Zr-doped Al2O3 xerogels were hybridized with α-Al2O3 whiskers. The α-Al2O3 whiskers were grown at 1400°C and thus sustained its phase and structure over 1400°C. The α-Al2O3 whiskers in xerogels act as a pillar at elevated temperatures. As a result, Zr doped Al2O3 xerogels hybridized with α-Al2O3 whiskers maintained their porous structure over 1400°C even though there was a phase transition from γ-Al2O3 to α-Al2O3.

Original languageEnglish
Pages (from-to)185-188
Number of pages4
JournalSurface and Coatings Technology
Volume231
DOIs
Publication statusPublished - 2013 Sep 25

Fingerprint

Xerogels
xerogels
drying
Drying
Aluminum Oxide
Alumina
aluminum oxides
Phase transitions
Zirconium
Superconducting transition temperature
transition temperature
Hexanes
Hexane
Specific surface area
Surface treatment
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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title = "A study on the properties of Zr-doped γ-Al2O3 xerogels hybridized with α-Al2O3 whiskers synthesized by solvothermal drying",
abstract = "Hydrophobic zirconium doped alumina xerogels and zirconium doped alumina xerogels hybridized with α-Al2O3 whisker were fabricated by Si(CH3)3 (trimethylsilyl substituent) modification of alcogels via ambient pressure solvothermal drying procedure. One-step solvent exchange and surface modification were simultaneously progressed by immersing alumina alcogels in hexamethyldisilazane/hexane solution. The synthesized Zr doped Al2O3 xerogels have shown increased phase transition temperature from γ-phase to α-phase over 200°C. Although phase transition temperature was increased, the porous structure of Zr-doped Al2O3 xerogel was collapsed over 1200°C losing its specific surface area. To maintain their porous structures at the elevated temperatures, the Zr-doped Al2O3 xerogels were hybridized with α-Al2O3 whiskers. The α-Al2O3 whiskers were grown at 1400°C and thus sustained its phase and structure over 1400°C. The α-Al2O3 whiskers in xerogels act as a pillar at elevated temperatures. As a result, Zr doped Al2O3 xerogels hybridized with α-Al2O3 whiskers maintained their porous structure over 1400°C even though there was a phase transition from γ-Al2O3 to α-Al2O3.",
author = "Jung, {In Keun} and Ha, {Tae Jung} and Hyung-Ho Park and Park, {Si Jung} and Choi, {Doo Jin} and Seungsu Baek",
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A study on the properties of Zr-doped γ-Al2O3 xerogels hybridized with α-Al2O3 whiskers synthesized by solvothermal drying. / Jung, In Keun; Ha, Tae Jung; Park, Hyung-Ho; Park, Si Jung; Choi, Doo Jin; Baek, Seungsu.

In: Surface and Coatings Technology, Vol. 231, 25.09.2013, p. 185-188.

Research output: Contribution to journalArticle

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T1 - A study on the properties of Zr-doped γ-Al2O3 xerogels hybridized with α-Al2O3 whiskers synthesized by solvothermal drying

AU - Jung, In Keun

AU - Ha, Tae Jung

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AU - Park, Si Jung

AU - Choi, Doo Jin

AU - Baek, Seungsu

PY - 2013/9/25

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