Stimuli-responsive hybrid materials: Breathing in magnetic layered double hydroxides induced by a thermoresponsive molecule
Entidad
UAM. Departamento de Física de la Materia Condensada; UAM. Departamento de Química InorgánicaEditor
The Royal Society of ChemistryFecha de edición
2015-03-01Cita
10.1039/c4sc03460k
Chemical Science 6. 3 (2015): 1949-1958
ISSN
2041-6520 (print); 2041-6539 (online)DOI
10.1039/c4sc03460kFinanciado por
Financial support from the EU (SpinMol Advanced Grant ERC- 2009-AdG-20090325 and ERC Starting Investigator Award STEMOX# 239739), the Spanish Ministerio de Economía y Competitividad (Projects with FEDER cofinancing MAT2011-22785, MAT2012-38567-C02-01, MAT2013-46753-C2, CTQ-2011-26507, Consolider-Ingenio 2010-Multicat CSD2009-00050, and Severo Ochoa Program SEV-2012-0267), Generalitat Valenciana (PROMETEO and ISIC-Nano programs), and VLC/Campus Microcluster “Functional Nanomaterials and Nanodevices” is gratefully acknowledged. This work was sponsored by US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (M.V.). G. A. thanks the EU for a Marie Curie Fellowship (FP7/2013-IEF- 627386). P. A. thanks the Spanish MINECO for a Ramón y Cajal Fellowship. We also acknowledge J. A. Carrasco for his help with the experimental work, and J. M. Martínez and G. Agustí for magnetic measurementsProyecto
info:eu-repo/grantAgreement/EC/FP7/239739; Gobierno de España. MAT2011-22785; Gobierno de España. MAT2012-38567-C02-01; Gobierno de España. MAT2013-46753-C2; Gobierno de España. CTQ-2011-26507; Gobierno de España. CSD2009-00050; Gobierno de España. SEV-2012-0267; info:eu-repo/grantAgreement/EC/FP7/247384; info:eu-repo/grantAgreement/EC/FP7/627386Versión del editor
http://dx.doi.org/10.1039/c4sc03460kMaterias
Magnetic couplings; Magnetic multilayers; Magnetism; Molecules; Crystal morphologies; Ferromagnetic layers; Layered double hydroxides; Física; QuímicaDerechos
© The Royal Society of Chemistry 2015Resumen
A hybrid magnetic multilayer material of micrometric size, with highly crystalline hexagonal crystals consisting of CoAl-LDH ferromagnetic layers intercalated with thermoresponsive 4-(4-anilinophenylazo)benzenesulfonate (AO5) molecules diluted (ratio 9:1) with a flexible sodium dodecylsulphate (SDS) surfactant has been obtained. The resulting material exhibits thermochromism attributable to the isomerization between the azo (prevalent at room temperature) and the hydrazone (favoured at higher temperatures) tautomers, leading to a thermomechanical response. In fact, these crystals exhibited thermally induced motion triggering remarkable changes in the crystal morphology and volume. In situ variable temperature XRD of these thin hybrids shows that the reversible change into the two tautomers is reflected in a shift of the position of the diffraction peaks at high temperatures towards lower interlayer spacing for the hydrazone form, as well as a broadening of the peaks reflecting lower crystallinity and ordering due to non-uniform spacing between the layers. These structural variations between room temperature (basal spacing (BS) = 25.91 Å) and 100 °C (BS = 25.05 Å) are also reflected in the magnetic properties of the layered double hydroxide (LDH) due to the variation of the magnetic coupling between the layers. Overall, our study constitutes one of the few examples showing fully reversible thermo-responsive breathing in a 2D hybrid material. In addition, the magnetic response of the hybrid can be modulated due to the thermotropism of the organic component that, by influencing the distance and in-plane correlation of the inorganic LDH, modulates the magnetism of the CoAl-LDH sheets in a certain range
Lista de ficheros
Google Scholar:Abellán, Gonzalo
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Jordá, Jose Luis
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Atienzar, Pedro
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Varela, María
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Jaafar Ruiz-Castellanos, Miriam
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Gómez Herrero, Julio
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Zamora Abanades, Félix Juan
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Ribera, Antonio
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García, Hermenegildo
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Coronado, Eugenio
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