Characterization of Geoinspired and Synthetic Chrysotile Nanotubes by Atomic Force Microscopy and Transmission Electron Microscopy

Abstract

Geoinspired synthetic chrysotile nanotubes both stoichiometric and 0.67 wt % Fe doped were characterized by transmission electron microscopy and electron diffraction. Bending tests of the synthetic chrysotile nanotubes were performed using the atomic force microscope. The nanotubes were found to exhibit elastic behaviour at small deformations (below ca. 20 nm). Young's modulus values of (159 ± 125) GPa and (279 ± 260) GPa were obtained from the force‐deflection curves using the bending equation for a clamped beam under a concentrated load, for the stoichiometric and the Fe doped chrysotile nanotubes, respectively. The structural modifications induced by Fe doping altered the mechanical properties, with an apparent dependence of the latter on the number of constituting walls of the nanotubes.

Adsorption of bovine serum albumin onto synthetic Fe-doped geomimetic chrysotile

“…In fact, octahedral coordinated Fe has been observed in all the substitution range in Fe-doped chrysotile synthesized in absence of metallic Fe. On the contrary, tetrahedral coordinated Fe inducing a flattening of the chrysotile structure appears prevalent in respect of octahedral coordinated Fe in highly Fe-doped chrysotile synthesized when metallic Fe is available in the synthetic environment [19,[21][22][23]. The position of the sites responsible for catalytic and redox activity of Fe of asbestos is currently unknown, even if the fibre surface appears mainly to control the Fe reactivity.…”

Polyamide-Imide Membranes of Various Morphology - Features of Nano-Scale Elements of Structure

“…The first note concerning the tubular structure of chrysotile was by Pauling (1930) who suggested that the Mg-analogue of kaolinite should have a curved structure because of the misfit between the octahedral and tetrahedral sheets [36]. Later investigators confirmed this hypothesis and the tubular structure of chrysotile was demonstrated by electron diffraction and transmission electron microscopy (TEM) [37].…”

Clay Mineral Nanotubes: Stability, Structure and Properties

“…Chrysotile (Piperno et al, 2007;Anbalagan et al, 2010) can be synthesized in aqueous solution under mild conditions, easily modified (Wypych et al, 2004;Wang et al, 2006;Wang et al, 2009) and functionalized (Nakagaki & Wypych, 2007). Therefore chrysotile is an interesting target material to be used as component of hybrid materials, support for catalysis, ionic channels, molecular sieving, for gas storage Nakagaki & Wypych, 2007) and other applications in nanotechnology.…”

“…The results have shown that chrysotile NTs exhibit elastic behavior at small deformation. The chrysotile Young's modulus evaluated by (Piperno et al, 2007) et al (2009) have studied the stability and structural properties of some armchair chrysotile NTs using the DFT method and helical symmetry approach as it is implemented in the CRYSTAL program . The structural results are in good agreement with the experimental data for NTs and lizardite monolayer.…”

“…The chrysotile structure is composed of brucite (Mg(OH) 2 ) and tridymite (silicon dioxide, SiO 2 ) layers. The brucite octahedral sheet forms the outer side of the tube and SiO 4 groups are anchored to the inner side of the tube (Piperno et al, 2007).…”