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Effect of Hydrodynamic Forces on meso ‐(4‐Sulfonatophenyl)‐Substituted Porphyrin J‐Aggregate Nanoparticles: Elasticity, Plasticity and Breaking
Author(s) -
ElHachemi Zoubir,
Balaban Teodor Silviu,
Campos J. Lourdes,
Cespedes Sergio,
Crusats Joaquim,
Escudero Carlos,
KammaLorger Christina S.,
Llorens Joan,
Malfois Marc,
Mitchell Geoffrey R.,
Tojeira Ana P.,
Ribó Josep M.
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201600874
Subject(s) - materials science , nanoparticle , carbon nanotube , transmission electron microscopy , elasticity (physics) , nanotube , plasticity , nanotechnology , composite material
The J aggregates of 4‐sulfonatophenyl meso ‐substituted porphyrins are non‐covalent polymers obtained by self‐assembly that form nanoparticles of different morphologies. In the case of high aspect‐ratio nanoparticles (bilayered ribbons and monolayered nanotubes), shear hydrodynamic forces may modify their shape and size, as observed by peak force microscopy, transmission electron microscopy of frozen solutions, small‐angle X‐ray scattering measurements in a disk‐plate rotational cell, and cone–plate rotational viscometry. These nanoparticles either show elastic or plastic behaviour: there is plasticity in the ribbons obtained upon nanotube collapse on solid/air interfaces and in viscous concentrated nanotube solutions, whereas elasticity occurs in the case of dilute nanotube solutions. Sonication and strong shear hydrodynamic forces lead to the breaking of the monolayered nanotubes into small particles, which then associate into large colloidal particles.