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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Becher, Tiago B. [1] ; Braga, Carolyne B. [1] ; Bertuzzi, Diego L. [1] ; Ramos, Jr., Miguel D. [1] ; Hassan, Ayaz [2] ; Crespilho, Frank N. [2] ; Ornelas, Catia [1]
Total Authors: 7
Affiliation:
[1] Univ Campinas Unicamp, Inst Chem, BR-13083861 Campinas, SP - Brazil
[2] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13560970 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: SOFT MATTER; v. 15, n. 6, p. 1278-1289, FEB 14 2019.
Web of Science Citations: 1
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 (R) materials. Our data suggest that pristine LAPONITE (R) 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 (R) 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 x 10(4) 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. (AU)

FAPESP's process: 13/11519-7 - Synthesis of new nanomaterials based on biodegradable supramolecular nanohydrogels for applications in drug delivery
Grantee:Cátia Cristina Capêlo Ornelas Megiatto
Support Opportunities: Regular Research Grants
FAPESP's process: 15/16672-3 - Development of High Performance Bioelectrodes for Application in Miniaturized Biofuel Cell
Grantee:Frank Nelson Crespilho
Support Opportunities: Regular Research Grants
FAPESP's process: 18/02093-0 - Development of new nanomaterials for nanomedicine applications
Grantee:Cátia Cristina Capêlo Ornelas Megiatto
Support Opportunities: Regular Research Grants
FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
Grantee:Osvaldo Novais de Oliveira Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 16/25806-6 - Interaction between biomolecules and nanostructures: electrochemistry, interfaces and surfaces
Grantee:Ayaz Hassan
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 15/04929-0 - Development of biosensors for instantaneous detection of proteins and cancer cells, for application on on-site biopsy
Grantee:Diego Luan Bertuzzi
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)