One Pot Synthesis of Mg2Al(OH)6Cl·1.5H2O Layered Double Hydroxides: The Epoxide Route

Oestreicher, Víctor; Jobbágy, Matı́as

doi:10.1021/la402260m

Cited by 43 publications

(61 citation statements)

References 57 publications

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“…Figure compiles this information along with the rate of Au III consumption and reduction into metallic form (AuNP growth) estimated from UV/Vis spectra analysis, and diameter evolution obtained by SAXS fitting. For both CTAC and PVP‐10k experiments, as soon as the reaction between chloride and Gly takes place, the pH increases from the acidic conditions given by HAuCl 4 up to the most alkaline conditions that the present method typically reaches, close to a value of 11 …”

Section: Resultsmentioning

confidence: 76%

“…The alkalinization method based on the epoxide route consists in the nucleophilic attack over an electrophilic carbon belonging to the epoxide ring . This reaction, typically carried out by chloride anions added as KCl, results in the epoxide ring‐opening of glycidol (or Gly) in the present case, and chlorohydrine formation (see Scheme , reactions 1 and 2).…”

Section: Resultsmentioning

confidence: 98%

“…Once the potential ability of Gly to drive the homogenous reduction of Au III was established, the experimental conditions were screened in order to ensure the quantitative formation of metallic nanoparticles, on the basis of the inherent reactivity of these reagents . When Gly (responsible of the alkalinization reaction and polyol generation, see Scheme ) was added, the initial HAuCl 4 yellow solution, containing chloride anions, turned colorless and then reddish, indicating quantitative reduction of Au III to Au I subsequently followed by Au nanoparticle formation.…”

Section: Resultsmentioning

confidence: 99%

“…In order to perform a further inspection of the main parameters that govern the alkalinization reaction, the variation of both chloride and glycidol concentrations could be explored. Chloride concentration modulates both the gold reduction potential (see Figure S3) and the alkalinization (reactions 1 and 2, Scheme ) versus hydrolysis (reaction 3, Scheme ) rates . In the present approach, in order to realize a simplified kinetics screening, only the glycidol concentration was explored as the experimental parameter to regulate the reaction rate.…”

Section: Resultsmentioning

confidence: 99%

“…The alkalinizationm ethod based on the epoxide route consists in the nucleophilic attack over an electrophilicc arbon belonging to the epoxide ring. [32] This reaction, typically carried out by chloride anions added as KCl, resultsi nt he epoxider ingopeningo fg lycidol( or Gly) in the present case, and chlorohydrine formation (see Scheme 1, reactions 1a nd 2). Nevertheless, the aqueous medium itselfi sa ble to decompose Gly through ah ydrolytica ttack, which results in the formation of glycerol( see Scheme 1, reaction 3).…”

Section: Synthesis Feasibilitymentioning

confidence: 88%

See 4 more Smart Citations

Mild Homogeneous Synthesis of Gold Nanoparticles through the Epoxide Route: Kinetics, Mechanisms, and Related One‐Pot Composites

Oestreicher

Huck‐Iriart

Soler-Illia

et al. 2020

Chemistry A European J

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A new one‐pot homogeneous methodology at room temperature to obtain Au nanoparticles (AuNP) on the basis of the epoxide route is presented. The proposed method takes advantage of the homogenous generation of OH− moieties driven by epoxide ring‐opening, mediated by chloride nucleophilic attack. Once reached alkaline conditions, the reducing medium allows the quantitative formation of AuNP under well‐defined kinetic control. A stabilizing agent, such as polyvinylpyrrolidone (PVP) or cetyltrimethylammonium chloride (CTAC), is required to maintain the AuNP stable. Meanwhile their presence dramatically affects the reduction kinetics and pathway, as demonstrated by the evolution of the UV/Vis spectra, small‐angle X‐ray scattering (SAXS) patterns, and pH value along the reaction. In the presence of PVP nanogold spheroids are obtained following a similar reduction mechanism as that observed for control experiments in the absence of PVP. However, if CTAC is employed a stable complex with AuIII is formed, leading to a different reaction pathway and resulting in ellipsoidal‐like shaped AuNP. Moreover, the proposed methodology allows stabilize the growing AuNP, by coupling their formation with nonalkoxidic sol–gel reactions, leading to nanocomposite gels with embedded metallic nanoparticles. The epoxide route thus offers a versatile scenario for the one‐pot preparation of new metal nanoparticles–inorganic/hybrid matrices nanocomposites with valuable optical properties.

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Synthesis Feasibilitymentioning

confidence: 88%

See 3 more Smart Citations

Mild Homogeneous Synthesis of Gold Nanoparticles through the Epoxide Route: Kinetics, Mechanisms, and Related One‐Pot Composites

Oestreicher

Huck‐Iriart

Soler-Illia

et al. 2020

Chemistry A European J

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Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

Taviot-Guého

Prévot

Forano

et al. 2017

Adv Funct Materials

240

142

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International audienceHybrid materials based on layered double hydroxides (LDHs) exhibit great potential in diverse fields such as health care, polymer composites, environment, catalysis, and energy generation. Indeed, the compositional flexibility and the scalability of LDH structures, their low cost, and their ease of synthesis have made hybrid LDHs extremely attractive for constructing smart and high-performance multifunctional materials. This review provides a comprehensive and critical overview of the current research on multifunctional hybrid LDHs. Organic–inorganic hybrid LDHs, intercalated and surface-immobilized structures, are both specifically addressed. The new trends and strategies for hybrid LDH synthesis are first described, and then the potential of the latest hybrid LDHs, polymer LDH nanocomposites, and LDH bio-nanocomposites are presented. Significant achievements published from ≈2010, including authors' results, which employ hybrid LDH assemblies in materials science, medicine, polymer nanocomposites, cement chemistry, and environmental technologies, are specifically addressed. It is concluded with remarks on present challenges and future prospects

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Enhancing the Supercapacitive Behaviour of Cobalt Layered Hydroxides by 3D Structuring and Halide Substitution

Seijas‐Da Silva,

Oestreicher,

Huck‐Iriart

et al. 2024

Batteries & Supercaps

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Among the two‐dimensional (2D) materials, layered hydroxides (LHs) stand out due to their chemical versatility, allowing the modulation of physicochemical properties on demand. Specifically, LHs based on earth‐abundant elements are promising phases as electrode materials for energy storage. However, these materials exhibit significant drawbacks, such as low conductivity and in‐plane packing that limits electrolyte diffusion. Here, we explored the synthetic flexibility of α‐Co hydroxides to overcome these limitations. We elucidated the growth mechanism of 3D flower‐like α‐Co hydroxyhalides by using in‐situ SAXS experiments combined with thorough physicochemical, structural, and electrochemical characterization. Furthermore, we compared these findings with the most commonly employed Co‐based LHs: β‐Co(OH)2 and CoAl LDHs. While α‐Co LH phases inherently grow as 2D materials, ethanol triggers the formation of 3D‐arrangements of these layers, surpassing their 2D analogues in capacitive behavior. Additionally, by taking advantage of their anion‐dependent bandgap, we demonstrated that substituting halides from chloride to iodide enhances capacitive behavior by > 40%. This finding confirms the role of halides in modulating the electronic properties of LH, as supported by DFT+U calculations. Hence, this work provides fundamental insights into the 3D growth of α‐Co LH and the critical influence of morphology and halide substitution on their electrochemical performance.

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One Pot Synthesis of Mg₂Al(OH)₆Cl·1.5H₂O Layered Double Hydroxides: The Epoxide Route

Cited by 43 publications

References 57 publications

Mild Homogeneous Synthesis of Gold Nanoparticles through the Epoxide Route: Kinetics, Mechanisms, and Related One‐Pot Composites

Mild Homogeneous Synthesis of Gold Nanoparticles through the Epoxide Route: Kinetics, Mechanisms, and Related One‐Pot Composites

Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

Enhancing the Supercapacitive Behaviour of Cobalt Layered Hydroxides by 3D Structuring and Halide Substitution

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