Mechanics of halloysite nanotubes

Kheng-Lim Goh, Rangika Thilan De Silva, Pooria Pasbakhsh

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    Abstract

    Halloysite is a naturally occurring alumino silicate and its structural makeup is similar to kaolinite, that is, it features a laminar structure comprising repeating layers of one tetrahedral (silica) sheet and one octahedral (alumina) sheet. The two sheets are held together to form a single layer with a thickness of about 0.72 nm. Unlike kaolinite, halloysite is commonly seen in a tubular shape (Figure 14.1a, b), and for this reason, halloysite particles are commonly referred to as halloysite nanotubes (HNTs). Starting from a crystal lattice of a kaolinite sheet, it tends to an energetically stable structure by distorting (when hydrated) and deforming into a tube. The question on why it rolls instead of performing a tetrahedral rotation addresses the mechanics to correct for misfit of the octahedral (alumina) and tetrahedral (silica) sheets (Singh et al., 1996). Singh et al. (1996) presented an elegant model to explain that the rolling mechanism encounters lower resistance from the Si-Si repulsion (as compared to tetrahedral rotation) to correct the same amount of misfit.

    Original languageEnglish
    Title of host publicationNatural Mineral Nanotubes: Properties and Applications
    EditorsPooria Pasbakhsh, G Jock Churchman
    Place of PublicationBoca Raton FL USA
    PublisherCRC Press
    Pages261-280
    Number of pages20
    Edition1st
    ISBN (Electronic)9781482262254
    ISBN (Print)9781771880565
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Axial stress
    • Cartesian coordinate
    • Elastic-plastic response
    • Heterogeneous atoms
    • Polymeric matrix material
    • Volume fraction
    • Young’s modulus

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