Effect of Hydrodynamic Forces on meso‐(4‐Sulfonatophenyl)‐Substituted Porphyrin J‐Aggregate Nanoparticles: Elasticity,Plasticity and Breaking |
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| Authors: | Dr Zoubir El‐Hachemi Prof Teodor Silviu Balaban Dr J Lourdes Campos Sergio Cespedes Dr Joaquim Crusats Dr Carlos Escudero Dr Christina S Kamma‐Lorger Prof Joan Llorens Dr Marc Malfois Prof Geoffrey R Mitchell Dr Ana P Tojeira Prof Josep M Ribó |
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| Institution: | 1. Department of Organic Chemistry, Institute of Cosmos Science (IEEC-UB), University of Barcelona (UB), Barcelona, Catalonia, Spain;2. Aix Marseille Université, CNRS UMR 7313, iSm2, Chirosciences, Marseille, France;3. Department of Chemical Engineering, Polytechnic University of Catalonia (UPC), Barcelona, Catalonia, Spain;4. ALBA Synchrotron Light Source, Cerdanyola del Vallès, Catalonia, Spain;5. Department of Chemical Engineering, University of Barcelona, Barcelona, Catalonia, Spain;6. Center for Rapid and Sustainable Product Development, Polytechnic Institute of Leiria, Portugal |
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| Abstract: | 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. |
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| Keywords: | aggregation nanoparticles porphyrinoids structure elucidation supramolecular chemistry |
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