Stimuli-responsive hybrid materials: breathing in magnetic layered double hydroxides induced by a thermoresponsive molecule

Abellán, Gonzalo; Jordá, José L.; Atienzar, Pedro; Varela, M.; Jaafar, Miriam; Gómez-Herrero, Júlio; Zamora, Félix; Ribera, Antonio; Garcı́a, Hermenegildo; Coronado, Eugenio

doi:10.1039/c4sc03460k

Cited by 41 publications

(53 citation statements)

References 55 publications

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“…In this context, urea acts as an ammonia releasing reagent (ARR) with the aim of controlling the pH of the solution. Due to the choice of this synthetic approach, which leads to carbonate‐intercalated LDHs, a subsequent two steps anion exchange reactions are mandatory for the purpose of this work . Furthermore, a well‐defined hexagonal morphology Co : Al ratio of 4 : 1 was synthesized for the first time using urea, in stark contrast with previous studies .…”

Section: Resultsmentioning

confidence: 99%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

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Layered double hydroxides (LDHs) are promising supercapacitor materials due to their wide chemical versatility, earth abundant metals and high specific capacitances. Many parameters influencing the supercapacitive performance have been studied such as the chemical composition, the synthetic approaches, and the interlayer anion. However, no systematic studies about the effect of the basal space have been carried out. Here, two‐dimensional (2D) CoAl‐LDHs were synthesized through anion exchange reactions using surfactant molecules in order to increase the interlayer space (ranging from 7.5 to 32.0 Å). These compounds exhibit similar size and dimensions but different basal space to explore exclusively the interlayer distance influence in the supercapacitive performance. In this line, Co : Al ratios of 2 : 1, 3 : 1 and 4 : 1 were explored. In all cases, an enhancement of the specific capacitance was observed by increasing the basal space, reaching ca. 50 % more than the value obtained from the less‐spaced 2 : 1 CoAl‐LDH (going from ca. 750 to 1100 F.g−1 at 1 A.g−1). This increment mainly occurs because of the increase in the electrochemical surface area (up to ca. 260 %) and the higher electrolyte diffusion. Interestingly, the best performance is achieved for the lowest Co : Al ratio (i. e. the highest Al content) revealing the important role of the electrochemically inert Al in the structure.

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Section: Resultsmentioning

confidence: 99%

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Silva

Sanchis‐Gual

Carrasco

et al. 2020

Batteries & Supercaps

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“…The main objective was to check the possibility of grafting an APTES molecules to a different LDH composition, confirming the homogeneity in the metallic distribution on a micrometric particle. For the synthesis of the CoAl‐LDH family, we carried out an initial homogeneous coprecipitation approach, followed by successive anion exchange reactions to obtain the final CoAl‐APTES material . This can be easily achieved, given that Al 3+ ‐containing LDH are favored towards anion exchange reactions (see Supporting Information with the experimental details) .…”

Section: Resultsmentioning

confidence: 99%

Fundamental Insights into the Covalent Silane Functionalization of NiFe Layered Double Hydroxides

Carrasco

Silva

Oestreicher

et al. 2020

Chemistry A European J

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Layered double hydroxides (LDHs) are ac lass of 2D anionic materials exhibiting wide chemical versatility and promising applications in different fields, ranging from catalysis to energy storage and conversion.H owever,t he covalent chemistry of this kind of 2D materials is still barely explored. Herein, the covalentf unctionalization with silanes of am agnetic NiFe-LDH is reported. The synthetic route consists of at opochemical approach followed by anion exchange reaction with surfactant molecules prior to covalent functionalization with the (3-aminopropyl)triethoxysilane (APTES) molecules. The functionalized NiFe-APTES was fully characterized by X-ray diffraction, infrared spectroscopy, electron microscopy,t hermogravimetric analysis coupled with mass spectrometry and 29 Si solid-state nuclear magnetic resonance, among others. The effect on the electronic properties of the functionalizedL DH was investigated by am agnetic study in combination with Mçssbauer spectroscopy. Moreover,t he reversibility of the silane-functionalizationa t basic pH was demonstrated, and the quality of the resulting LDH was proven by studying the electrochemical performance in the oxygen evolution reaction in basic media. Furthermore, the anion exchange capability for the NiFe-APTES was tested employing Cr VI ,r esulting in an increase of 200 %o ft he anion retention. This report allows for an ew degree of tunability of LDHs, openingt he door to the synthesis of new hybrid architectures and materials.[a] Dr.Figure 2. FESEM (A), TEM (B) and mapping images (bottom panel) of NiFe-APTES. The inset in (A) shows DLS and the inset in (B) showst he SAED pattern. Mapping imagesare obtained from the single particle in the bottom left image( scale bar of 100 nm).

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“…The dyes are not coordinated to the layers and photo-magnetic and thermo-magnetic effects were observed. [142,143] Brought to you by | Stockholms Universitet Authenticated Download Date | 8/15/15 9:13 PM involving different diamine bridges. [140,144,145] The insertion of such complexes generates specific difficulties due to their possible hydrolysis during the exchange reaction.…”

Section: Hybrid Materials Including Photoactive Molecules or Complexementioning

confidence: 99%

Hybrid interfaces in layered hydroxides: magnetic and multifunctional superstructures by design

Rabu¹,

Delahaye²,

Rogez³

2015

Nanotechnology Reviews

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The hybridization of simple transition metal hydroxides provides prototypical examples of layered magnetic and bifunctional hybrid materials in which the influence of the hybrid interface on the behavior of multiproperty systems can be evaluated. AbstractThis article is a critical review on layered hybrid organic-inorganic functional structures. We specially discuss series of results concerning the design of magnetic and multiproperty systems derived from hybridization of layered transition metal hydroxides. Series of hybrid materials showing original magnetic properties are reviewed, which were prepared by functionalization of layered simple hydroxides (LSH) of general formula M 2 (OH) 3 A (M = Co, Cu, Ni, Zn, ... and A = NO 3 -, OAc -, alkylcarboxylates, peptides, metal complexes...). To make the point on this vast family of hybrid compounds, we present first the work investigating the mechanism of interaction and the structural factors influencing the magnetic properties of hybrid materials based on LSH. Then we detail how even more complex anions can be immobilized and grafted into the interlamellar space giving rise to new functionalities. These systems are very good models for understanding the correlations between the structure of hybrid systems and the physical properties brought by the inorganic host and by the molecular moieties grafted onto the inorganic metal network. The interface between the organic and inorganic components, i.e. chemical bonding, charge density, or local pressure, is essential for the control of the properties of multifunctional hybrid systems. Some conclusions are drawn on the future of this approach, useful for developing new two-dimensional functional systems.

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Stimuli-responsive hybrid materials: breathing in magnetic layered double hydroxides induced by a thermoresponsive molecule

Abstract: A hybrid magnetic multilayer material consisting of CoAl–LDH ferromagnetic layers intercalated with thermoresponsive molecules diluted with a flexible surfactant has been obtained.

Cited by 41 publications

References 55 publications

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Boosting the Supercapacitive Behavior of CoAl Layered Double Hydroxides via Tuning the Metal Composition and Interlayer Space

Fundamental Insights into the Covalent Silane Functionalization of NiFe Layered Double Hydroxides

Hybrid interfaces in layered hydroxides: magnetic and multifunctional superstructures by design

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