Hydrothermal Synthesis of Boehmite Nanostructures

The hydrothermal synthesis of boehmite (γ-AlOOH) nanostructures has emerged as a versatile strategy to produce high-purity aluminium oxyhydroxides with tailored morphology and surface properties. Under controlled temperature (typically 150–200 °C) and autogenous pressure, aluminium precursors—including gibbsite, sodium aluminate, aluminium salts or even metallic aluminium—undergo dissolution–precipitation reactions to yield diverse architectures such as nanorods, nanosheets, hollow spheres and hierarchical microspheres. Phase evolution proceeds via initial hydrolysis of aluminium species, formation of lamellar boehmite nuclei and subsequent self-assembly through oriented attachment and Ostwald ripening. Fine-tuning of pH, mineralisers and structure-directing agents (for example triblock copolymers or quaternary ammoniums) governs the exposed crystal facets, aspect ratio and porosity. Seeding approaches and the addition of inorganic anions have been shown to direct nucleation sites and modulate growth kinetics. Post-synthesis calcination further converts boehmite into gamma-alumina while conserving the parent morphology. This methodology yields materials with high surface area, narrow size distributions and controlled pore structures. The versatility of hydrothermal processing under relatively mild conditions offers scalable routes to boehmite nanostructures for applications ranging from heterogeneous catalysis and adsorption to proton conduction, drug delivery and advanced composites. Emerging trends focus on green reagents, medium reuse and in situ fabrication of core–shell architectures, reflecting a growing interest in sustainable manufacturing of functional aluminium nanomaterials.

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Hydrothermal Synthesis of Boehmite Nanostructures publication trend

The graph below shows the total number of articles in hydrothermal synthesis of boehmite nanostructures across all publications each year (not limited to Nature Index journals).

Technical terms

Boehmite: γ-AlOOH, an aluminium oxyhydroxide with layered structure.

Hydrothermal synthesis: A method using aqueous solution in a sealed vessel at elevated temperature and pressure to crystallise materials.

Oriented attachment: Alignment and fusion of primary nanocrystals along specific crystallographic directions during growth.

Ostwald ripening: Growth mechanism where larger crystals grow at the expense of smaller ones due to differences in solubility.

Structure-directing agent: A molecule or polymer that guides the assembly of inorganic units into defined morphologies.

Autogenous pressure: Pressure generated by the vapour of the solvent in a closed system during heating.

References

1. Synthesis and Characterization of Boehmites Obtained from Gibbsite in Presence of Different Environments. Materials Research (2016).
2. Synthesis of core–shell AlOOH hollow nanospheres by reacting Al nanoparticles with water. Nanotechnology (2016).
3. Precipitation of spherical boehmite from concentrated sodium aluminate solution by adding gibbsite as seed. International Journal of Minerals, Metallurgy and Materials (2017).
4. Hydrothermal synthesis of hierarchical boehmite (γ-AlOOH) hollow microspheres with highly active surface. AIP Advances (2021).
5. Morphology Controlled Synthesis of γ-Al2O3 Nano-Crystallites in Al@Al2O3 Core–Shell Micro-Architectures by Interfacial Hydrothermal Reactions of Al Metal Substrates. Nanomaterials (2021).