Electrodeposition of SmCo Nanostructures in Deep Eutectic Solvent

Gómez, Elvira; Vallés, E.; Cojocaru, Paula; Raygani, Anahit; Magagnin, Luca

doi:10.1149/1.4718387

Cited by 16 publications

(10 citation statements)

References 7 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Along these lines, Magagnin and co-workers realized the coelectrodeposition of Sm and Co in reline at a large negative potential (−1.6 V vs Ag/AgCl) to generate uniform, fine-grained SmCo deposits. 27 Well-defined SmCo alloy nano- wires were also grown by electrodeposition into anodic aluminum oxide membranes with uniform ∼50 nm channels.…”

Section: Film Electrodepositionmentioning

confidence: 99%

Deep Eutectic Solvents: Sustainable Media for Nanoscale and Functional Materials

2014

View full text Add to dashboard Cite

Deep eutectic solvents (DESs) represent an alternative class of ionic fluids closely resembling room-temperature ionic liquids (RTILs), although, strictly speaking, they are distinguished by the fact that they also contain an organic molecular component (typically, a hydrogen bond donor like a urea, amide, acid, or polyol), frequently as the predominant constituent. Practically speaking, DESs are attractive alternatives to RTILs, sharing most of their remarkable qualities (e.g., tolerance to humidity, negligible vapor pressure, thermostability, wide electrochemical potential windows, tunability) while overcoming several limitations associated with their RTIL cousins. Particularly, DESs are typically, less expensive, more synthetically accessible (typically, from bulk commodity chemicals using solvent/waste-free processes), nontoxic, and biodegradable. In this Account, we provide an overview of DESs as designer solvents to create well-defined nanomaterials including shape-controlled nanoparticles, electrodeposited films, metal-organic frameworks, colloidal assemblies, hierarchically porous carbons, and DNA/RNA architectures. These breakthroughs illustrate how DESs can fulfill multiple roles in directing chemistry at the nanoscale: acting as supramolecular template, metal/carbon source, sacrificial agent (e.g., ammonia release from urea), and/or redox agent, all in the absence of formal stabilizing ligand (here, solvent and stabilizer are one and the same). The ability to tailor the physicochemical properties of DESs is central to controlling their interfacial behavior. The preorganized "supramolecular" nature of DESs provides a soft template to guide the formation of bimodal porous carbon networks or the evolution of electrodeposits. A number of essential parameters (viscosity, polarity, surface tension, hydrogen bonding), plus coordination with solutes/surfaces, all play significant roles in modulating species reactivity and mass transport properties governing the genesis of nanostructure. Furthermore, DES components may modulate nucleation and growth mechanisms by charge neutralization, modification of reduction potentials (or chemical activities), and passivation of particular crystal faces, dictating growth along preferred crystallographic directions. Broad operational windows for electrochemical reactions coupled with their inherent ionic nature facilitate the electrodeposition of alloys and semiconductors inaccessible to classical means and the use of cosolvents or applied potential control provide under-explored strategies for mediating interfacial interactions leading to control over film characteristics. The biocompatibility of DESs suggests intriguing potential for the construction of biomolecular architectures in these novel media. It has been demonstrated that nucleic acid structures can be manipulated in the ionic, crowded, dehydrating (low water activity) DES environment-including the adoption of duplex helical structures divergent from the canonical B form and parallel G-quadruplex DNA persisting ne...

show abstract

Section: Film Electrodepositionmentioning

confidence: 99%

Deep Eutectic Solvents: Sustainable Media for Nanoscale and Functional Materials

2014

View full text Add to dashboard Cite

show abstract

“…[144][145][146][147][148][149] In 2008, the first example of using DESs in biocatalysis was reported by Kazlauskas et al, 144 who investigated the activity of enzymes in the transesterification of ethyl valerate with butanol, showing that these enzymes were stable in ChCl-U. ChCl-U, ChCl-EG Zinc [163][164][165][166][167][168][169][170][171] ChCl-U, ChCl-EG Cobalt [172][173][174][175][176] ChCl-U, ChCl-EG Nickel 175,177,178 ChCl-U, ChCl-EG, ChCl-MA Ferrocene 155,179 ChCl-EG Tin 180 ChCl-U Gallium 158 ChCl-EG Chromium 174 ChCl-EG Silver 181 ChCl-U Indium 182 ChCl-U, ChCl-EG, ChCl-1,2 PD, ChCl-1,3-PD, ChCl-TU a Mercury 183 a Acronyms: ChDC, Choline dihydrogencitrate; TU, Thiourea.…”

Section: Biotransformation In Dessmentioning

confidence: 99%

Deep eutectic solvents: designer fluids for chemical processes

Wazeer

Hayyan

Hadj-Kali

2017

J of Chemical Tech & Biotech

106

View full text Add to dashboard Cite

The increasing demand for multi‐task green solvents has spurred the development of next‐generation liquid media such as deep eutectic solvents (DESs), which have recently attracted increased attention. DESs are mixtures of salts and complexing agents, having freezing points lower than those of starting individual components. Similarly to ionic liquids, DESs exhibit distinctive properties such as chemical and thermal stability, biodegradability, non‐flammability, and cost effectiveness. These features account for their wide range of applications, e.g. as extractants, reactants, catalysts, reaction media, additives, and lubricants. This review summarizes the recent research efforts directed at exploring the potential applications of DESs in various chemical processes. With the rapid publication of reports on this new generation of solvents, other roles also are expected to be seen sooner or later. © 2017 Society of Chemical Industry

show abstract

“…[13][14][15] On the other hand, SmCo film grown in a 1ChCl:2EG solution without glycine presents a significantly higher coercive field H c = 270 Oe (21.5 A/m), in agreement with the value reported for the 1ChCl:2U system. [4][5][6] The out-of-plane direction is again a hard axis for the magnetization (Figure 6b). A comparison between the in-plane M(H) curves for the three samples is shown in Figure 7.…”

Section: Resultsmentioning

confidence: 93%

“…Gomez et al and Cojocaru et al proposed a study on the electrodeposition of SmCo from a deep eutectic solvent (DES) based on choline chloride and urea (1ChCl:2U). [4][5][6] The suitability of such a system for the electrodeposition of both single metals (Sm and Co) and alloy (SmCo) was verified. Deposits were characterized by a high Sm content, i.e.…”

mentioning

confidence: 95%

Electrodeposition of Magnetic SmCo Films from Deep Eutectic Solvents and Choline Chloride-Ethylene Glycol Mixtures

Panzeri

Tresoldi

Rinaldi

et al. 2017

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

Suitability of mixtures based on ethylene glycol and choline chloride is evaluated for the electrodeposition of magnetic SmCo alloys. Deep eutectic solvents (DES) are characterized by a wide electrochemical window, allowing the electrodeposition of metallic elements having a highly negative reduction potential. Electrodeposition of unconventional metals with reduction potential well below hydrogen evolution one is, in principle, feasible (e.g. Sm). Moreover, the limited presence of water during the growth of SmCo alloys may reduce oxidation and consequently improve the magnetic properties with respect to the employment of an aqueous bath. Deposits composition is strongly affected by process parameters and bath composition. Increasing choline chloride concentration and/or adding glycine to the solution allows to achieve higher Sm content in the deposit. Potentiostatic electrodeposition has been carried out in a conventional three electrodes cell, with potential interval selected from −0. The role of non-aqueous electrolytes is gaining importance due to their ability to overcome limitations normally observed in the electrodeposition processes from aqueous media. In particular, this is true for the metal elements having reduction potential well below hydrogen evolution one. Ionic liquids are in fact characterized by wider electrochemical windows limiting the onset of secondary processes suppressing the metal reduction one.1-3 One practical example is the electrodeposition of rare earth metals and their alloys (e.g. SmCo). Gomez et al. and Cojocaru et al. proposed a study on the electrodeposition of SmCo from a deep eutectic solvent (DES) based on choline chloride and urea (1ChCl:2U). [4][5][6] The suitability of such a system for the electrodeposition of both single metals (Sm and Co) and alloy (SmCo) was verified. Deposits were characterized by a high Sm content, i.e. 46-79 wt% Sm, while the optimal composition for the best magnetic performances is 23-25 wt% Sm, corresponding to the Sm 2 Co 17 phase. [7][8][9] In literature, works on this alloy from both waterbased 10-16 and non-aqueous solution are reported. 17 In the former case, fundamental is the employment of glycine as complexing agent as shown by Wei et al. [13][14][15] However, in-plane coercivities in the order of H c|| = 100 Oe were observed with the formation of SmO, Sm(OH) 3 and Co(OH) 2 .14 These values are referred to films produced by electrodeposition, an interesting technique from the fabrication point of view but with a huge limitations in terms of compositional and purity control with respect to traditional methods as casting or sputtering through which hard SmCo magnets are obtained (H c|| ∼ kOe).This work consists in the study of different mixtures based on ethylene glycol and choline chloride (1ChCl:2EG and 1ChCl:4.5EG) in order to evaluate the effect of ChCl concentration on SmCo codeposition and its magnetic properties. Studies on the physical properties of solutions with different ChCl:HBD (Hydrogen Bond Donor) molar ratio are reported in ...

show abstract

Electrodeposition of SmCo Nanostructures in Deep Eutectic Solvent

Cited by 16 publications

References 7 publications

Deep Eutectic Solvents: Sustainable Media for Nanoscale and Functional Materials

Deep Eutectic Solvents: Sustainable Media for Nanoscale and Functional Materials

Deep eutectic solvents: designer fluids for chemical processes

Electrodeposition of Magnetic SmCo Films from Deep Eutectic Solvents and Choline Chloride-Ethylene Glycol Mixtures

Contact Info

Product

Resources

About