Imogolite Nanotube Synthesis and Characterization

Imogolite nanotubes are single-walled aluminosilicate cylinders with diameters of approximately 1–3 nm and high aspect ratios, forming through controlled sol-gel and hydrothermal processes. Sol-gel synthesis enables direct functionalisation of the tube surface via co-condensation of organosilanes, while hydrothermal routes promote crystallinity by adjusting pH, temperature and silicate precursor concentrations. Characterisation techniques such as transmission electron microscopy, X-ray scattering, solid-state NMR and infrared spectroscopy have elucidated precise structural parameters, wall thickness and defect populations. In dilute aqueous suspension, imogolite displays lyotropic liquid-crystalline behaviour, allowing alignment under electric fields or during fibre spinning. Complementary computational modelling has revealed permanent intrawall polarisation and spatially separated band edges, informing the design of imogolite-based photocatalysts. The interplay of ordered porosity, surface polarisation and mechanical robustness underpins applications in water remediation, nanocomposite reinforcement and energy conversion, highlighting the global significance of this versatile nanotubular platform.

Research from Nature Portfolio

Recent studies have shown that highly dilute suspensions of imogolite adopt a stable hexagonal columnar liquid-crystalline phase at volume fractions near 0.2%, facilitating uniform alignment under alternating electric fields and enabling the fabrication of ordered nanocomposites. Advanced structural analysis combining reduced-parameter X-ray scattering fits with atomistic simulations has resolved the atomic arrangement of methylated aluminosilicate and aluminogermanate imogolite nanotubes, uncovering unexpected rolling modes that refine structure–property correlations. Additionally, ambient-condition synthesis of short-range-ordered aluminosilicates that resemble proto-imogolite has revealed composition-dependent aggregation effects controlling surface area and functional group accessibility, thus guiding scalable approaches for environmental sequestration and catalytic use.

Imogolite Nanotube Synthesis and Characterization publication trend

The graph below shows the total number of articles in imogolite nanotube synthesis and characterization across all publications each year (not limited to Nature Index journals).

Technical terms

Imogolite nanotube: A single-walled aluminosilicate tube with a uniform inner diameter (~1–3 nm) and high aspect ratio, exhibiting distinct inner and outer surface chemistries.

Sol-gel method: A synthesis approach in which colloidal sols undergo gelation via hydrolysis and condensation reactions to form inorganic networks.

Hydrothermal synthesis: A process that crystallises materials from aqueous solutions at elevated temperatures and pressures to yield well-defined nanostructures.

Liquid-crystalline phase: A phase in which anisotropic particles in suspension exhibit long-range orientational order while retaining fluidity.

References

1. Imogolite Nanotubes: A Flexible Nanoplatform with Multipurpose Applications. Applied Sciences (2018).
2. A liquid-crystalline hexagonal columnar phase in highly-dilute suspensions of imogolite nanotubes. Nature Communications (2016).
3. Structural resolution of inorganic nanotubes with complex stoichiometry. Nature Communications (2018).
4. Synthesis of short-range ordered aluminosilicates at ambient conditions. Scientific Reports (2021).
5. Imogolite prepared from cement kiln dust removes arsenite from water. Environmental Technology & Innovation (2023).
6. Imogolite Nanotubes and Their Permanently Polarized Bifunctional Surfaces for Photocatalytic Hydrogen Production. Global Challenges (2023).
7. Wet spinning imogolite nanotube fibres: an in situ process study. Nanoscale Advances (2023).