Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 6, 2019
Previous Article Next Article

The structure–property relationship in LAPONITE® materials: from Wigner glasses to strong self-healing hydrogels formed by non-covalent interactions

Author affiliations

Abstract

Rheology, small-angle X-ray scattering (SAXS), and dynamic light scattering (DLS) analysis, zeta potential measurement, scanning electron microscopy (SEM), and micro-FTIR and absorbance spectroscopy were used to enlighten the controversial literature about LAPONITE® materials. Our data suggest that pristine LAPONITE® in water does not form hydrogels induced by the so-called “house of cards” assembly, but rather forms Wigner glasses governed by repulsive forces. Ionic interactions between anisotropic LAPONITE® nanodiscs, sodium polyacrylate and inorganic salts afforded hydrogels that were transparent, self-standing, moldable, strong, and biocompatible with shear-thinning and self-healing behavior. An extensive study on the role of salts in the gelification process dictates a trend that relates the valence of cations with the viscoelastic properties of the bulk material (G′ values follow the trend, monovalent < divalent < trivalent). These hydrogels present G′ values up to 5.1 × 104 Pa, which are considered high values for non-covalent hydrogels. Hydrogels crosslinked with sodium phosphate salts are biocompatible, and might be valid candidates for injectable drug delivery systems due to their shear-thinning behavior with rapid self-healing after injection.

Graphical abstract: The structure–property relationship in LAPONITE® materials: from Wigner glasses to strong self-healing hydrogels formed by non-covalent interactions

Back to tab navigation

Supplementary files

Publication details

The article was received on 25 Sep 2018, accepted on 08 Nov 2018 and first published on 08 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM01965G
Citation: Soft Matter, 2019,15, 1278-1289

  •   Request permissions

    The structure–property relationship in LAPONITE® materials: from Wigner glasses to strong self-healing hydrogels formed by non-covalent interactions

    T. B. Becher, C. B. Braga, D. L. Bertuzzi, M. D. Ramos, A. Hassan, F. N. Crespilho and C. Ornelas, Soft Matter, 2019, 15, 1278
    DOI: 10.1039/C8SM01965G

Search articles by author

Spotlight

Advertisements