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Related Concept Videos

Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

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Updated: Jul 3, 2026

TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method
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Published on: April 26, 2017

Atomic-Layer-Engineered Inorganic-Organic Dual-Shell Nanocoatings for Water-Resistant Aluminum Hydride.

Wenqing Wang1, Xingxing Xu2, Xiao Liu1

  • 1School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.

ACS Applied Materials & Interfaces
|July 2, 2026
PubMed
Summary
This summary is machine-generated.

Aluminum hydride (AlH3) fuel is protected from moisture using a dual-shell coating. This innovation significantly improves the stability and water resistance of this high-energy-density material for practical applications.

Keywords:
FAS-17 coatingTiO2 atomic layer depositionaluminum hydridedual-shell nanocoatingwater resistance

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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Aluminum hydride (AlH3) is a high-energy-density fuel with potential for solid propellants.
  • Moisture sensitivity of AlH3 limits its practical use in energetic materials.
  • Developing stable and water-resistant AlH3 is crucial for advanced applications.

Purpose of the Study:

  • To enhance the water resistance and stability of aluminum hydride (AlH3).
  • To investigate the efficacy of an inorganic-organic dual-shell surface architecture for AlH3.
  • To improve the practical applicability of AlH3 as a fuel in solid propellants.

Main Methods:

  • Constructed a dual-shell surface architecture on AlH3 using atomic-layer-deposited TiO2 (inorganic inner layer) and perfluorodecyltrimethoxysilane (FAS-17) (organic outer layer).
  • Characterized the coating structure, thickness, and surface properties.
  • Evaluated the water resistance and stability of coated AlH3 under various humidity and liquid aging conditions (25°C, 85% RH for 15 days; 50°C hydrothermal and acidic aging).

Main Results:

  • The dual-shell coating (2.5 nm TiO2 + 4.6 nm FAS-17) provided excellent water resistance, with 99.95% mass retention after 15 days at 25°C and 85% RH.
  • Coated AlH3 exhibited suppressed hydrogen release and preserved particle morphology during hydrothermal and acidic aging tests.
  • The TiO2 interlayer enhanced thermal stability, while the FAS-17 outer layer created a superhydrophobic surface via Si-O-Ti bonds.

Conclusions:

  • The inorganic-organic dual-shell nanocoating effectively enhances the moisture resistance and stability of aluminum hydride (AlH3).
  • Atomic-layer-deposited interlayers combined with hydrophobic surface modification are effective strategies for stabilizing moisture-sensitive energetic materials.
  • This approach significantly improves the potential for practical application of AlH3 in solid propellants and other energetic systems.