Imogolite: a nanotubular aluminosilicate: synthesis, derivatives, analogues, and general and biological applications

Govan, Joseph; Arancibia‐Miranda, Nicolás; Escudey, Mauricio; Bonelli, Barbara; Tasca, Federico

doi:10.1039/d1qm00617g

Cited by 14 publications

(6 citation statements)

References 232 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent works proposed several pathways (varying the concentration and the nature of the precursors, pH, and temperature) to obtain INTs with monodisperse diameter and chirality combined with controlled functionalization of the interfaces. [18][19][20] In particular, the isomorphic substitution of silicon by germanium allows obtaining INTs with either singlewalled (SW) or double-walled (DW) structures depending on the concentration of aluminum precursors (Figure 1). [21] D. Vantelon The progress in synthesis methods has brought new insights into the growth mechanism of INTs.…”

Section: Introductionmentioning

confidence: 99%

Nonclassical Growth Mechanism of Double‐Walled Metal‐Oxide Nanotubes Implying Transient Single‐Walled Structures

Paineau,

Bourdelle,

Bhandary

et al. 2024

Small

View full text Add to dashboard Cite

The formation of imogolite nanotubes is reported to be a kinetic process involving intermediate roof‐tile nanostructures. Here, the structural evolution occurring during the synthesis of aluminogermanate double‐walled imogolite nanotubes is in situ monitored, thanks to an instrumented autoclave allowing the control of the temperature, the continuous measurement of pH and pressure, and the regular sampling of gas and solution. Chemical analyses confirm the completion of the precursor's conversion with the release of CO2, ethanol, and dioxane as main side products. The combination of microscopic observations, infrared, and absorption spectroscopies with small and wide‐angle X‐ray scattering experiments unravel a unique growth mechanism implying transient single‐walled nanotubes instead of the self‐assembly of stacked proto‐imogolite tiles. The growth formation of these transient nanotubes is followed at the molecular level by Quick‐X‐ray absoprtion specotrscopy experiments. Multivariate data analysis evidences that the near neighboring atomic environment of Ge evolves from monotonous to a more complex one as the reaction progresses. The following transformation into a double‐walled nanotube takes place at a nearly constant mean radius, as demonstrated by the simulation of X‐ray scattering diagrams. Overall, transient nanotubes appear to serve for the anchoring of a new wall, corresponding to a mechanism radically different from that proposed in the literature.

show abstract

Section: Introductionmentioning

confidence: 99%

Nonclassical Growth Mechanism of Double‐Walled Metal‐Oxide Nanotubes Implying Transient Single‐Walled Structures

Paineau,

Bourdelle,

Bhandary

et al. 2024

Small

View full text Add to dashboard Cite

show abstract

“…hydrophilic or hydrophobic surfaces). [15,16] Recently, density functional theory (DFT) studies suggested that INTs could be the ideal photocatalyst, offering at the same time high reactive surface area and natural charge carrier separation thanks to its permanent polarization. [17] The originality of these nanotubes stems from the atypical spatial separation of the valence (VB) and conduction band (CB) edges across the nanotube walls, [17][18][19] Such a unique VB/CB configuration should promote an efficient charge carriers separation of electrons and holes (e -/h + ), resulting in an enhanced photoefficiency by reducing e -/h + recombination.…”

Section: Introductionmentioning

confidence: 99%

Ti-modified imogolite nanotubes: highly photoactive nanoreactors for H2 production

Jiménez‐Calvo

Sobolewska

Isaacs

et al. 2023

Preprint

View full text Add to dashboard Cite

Imogolite nanotubes present a unique spatial separation of conduction and valence bands but the large bandgap inhibits potential application as a photocatalyst. The first step toward using these well-defined nanotubes in photocatalysis and exploiting their natural polarization-promoting charge separation across the nanotubes wall, is to tune their bandgap energy. Here, titanium modified double walled aluminogermanate imogolite nanotubes are prepared to overcome this limitation. Structural and optical properties are determined at different scales and the photocatalytic performance is evaluated for H2 production under UV-visible light irradiation. Although the incorporation of Ti atoms into the structure remains limited, the resulting nanotubes reveal a remarkable hydrogen evolution rate of ~1500 µmol g-1 h-1, corresponding to a 65-fold increase relative to a reference TiO2P25 photocatalyst. These results confirm the theoretical predictions regarding the untapped potential of modified imogolite nanotubes as promising 1D photoactive polarized nanoreactors.

show abstract

Section: Introductionmentioning

confidence: 99%

“…This strain is a driving force for the 2D layer to roll into a nanotube. It has been shown that this class of materials, which includes imogolite 26 as well as TMD structures, form nanotubes with a preferred size, often in the nm range, which corresponds to the structure being energetically more favorable. 27 In recent work, Mikkelsen and co-workers investigated the structural and electronic properties of single wall (SW) 1H-MoSTe nanotubes obtained by wrapping up Janus 2D sheets.…”

Section: Introductionmentioning

confidence: 99%

Structural and electronic properties of double wall MoSTe nanotubes

Lan,

Kapunan,

Vegge

et al. 2023

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

Imogolite: a nanotubular aluminosilicate: synthesis, derivatives, analogues, and general and biological applications

Abstract: Imogolite is an aluminosilicate mineral originally found in volcanic ash derived soils. Through the use of chemical synthesis methods this mineral has been successfully synthesized and a number of modified...

Cited by 14 publications

References 232 publications

Nonclassical Growth Mechanism of Double‐Walled Metal‐Oxide Nanotubes Implying Transient Single‐Walled Structures

Nonclassical Growth Mechanism of Double‐Walled Metal‐Oxide Nanotubes Implying Transient Single‐Walled Structures

Ti-modified imogolite nanotubes: highly photoactive nanoreactors for H2 production

Structural and electronic properties of double wall MoSTe nanotubes

Contact Info

Product

Resources

About