Colloidal dispersions of oxide nanoparticles in ionic liquids: elucidating the key parameters

Riedl, Jesse; Kazemi, Mohammad Ali Akhavan; Cousin, Fabrice; Dubois, Emmanuelle; Fantini, Sébastien; Lois, Sandrine; Perzynski, R.; Peyre, Véronique

doi:10.1039/c9na00564a

Cited by 35 publications

(58 citation statements)

References 56 publications

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“…The same batch of maghemite ( -Fe 2 O 3 ) nanoparticles was used for all experiments. This batch was already used in reference [45], where the synthesis [35,23] and the sample characteristics are described in detail. Briefly, sodium hydroxide solution was added to the initial acid ferrofluid stabilised with nitrate counterions till the point of zero charge was reached at pH˘7.…”

Section: Preparation Of Ionic Liquid-based Colloidsmentioning

confidence: 99%

“…The SAXS and SANS form factor P(Q) of the nanoparticles were obtained from the extrapolation at 0vol% of several dilute colloidal dispersions in water with low interparticle interactions. See the ESI of [45] for details and the corresponding curves. These form factors were used to determine structure factors S(Q) from the measured intensity I(Q) using:…”

Section: Analyses Of the Samplementioning

confidence: 99%

“…In a recent publication [45] it was demonstrated that colloidally long-term stable dispersions of oxide nanoparticles in EMIM TFSI can be prepared composed of positive nanoparticles with SBMIM ± TFSI * assumed to be at the solid liquid interface. Here, the role of both species (the zwitterion SBMIM ± and the anion TFSI * ) is analysed in a decoupled way.…”

Section: Decoupled Analysis Of the Optimal Counterion Concentrations At 1vol% Of Nanoparticlesmentioning

confidence: 99%

“…Such dispersions of NPs can be considered as potential heat transfer fluids thanks to their improved thermal properties [14]. Several approaches can stabilise nanoparticle dispersions in ionic liquids, ion layering of the ionic liquid around the nanoparticle being one possibility [54,24,42,34,32,45]. It leads to repulsive (oscillatory) forces that can outrank the attractive Van der Waals forces between the nanoparticles and therefore colloidal stability is obtained.…”

Section: Introductionmentioning

confidence: 99%

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Design of Long-Term Stable Concentrated Colloidal Dispersions in Ionic Liquids up to 473 K

Riedl¹,

Sarkar²,

Fiuza³

et al. 2021

Preprint

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<div> <div> <div> <p>The use of ionic liquid-based colloids at elevated temperatures is one of their most promising fields of application. However long term stability on the whole range of temperature is mandatory. First a detailed study on colloidal dispersions of iron oxide nanoparticles in EMIM TFSI is performed at room temperature in order to determine the best solid/liquid interface. The previously identified key parameters are tuned: the surface charge density and the nature of the counterions. Here a sulfonate based imidazolium ion is chosen. In a second step, the thermal stability of these nanoparticle dispersions is analysed on the short and long term up to 473 K (200◦C) combining dynamic light scattering (DLS), small angle X-ray/neutron scattering (SAXS/SANS) and thermogravimetric analysis (TGA). Ionic liquid-based colloidal dispersions of iron oxide nanoparticles in EMIM TFSI stable in the long term can be obtained at least up to 473 K and nanoparticle concentrations of 12 vol% (≈30wt%) </p> </div> </div> </div>

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Section: Preparation Of Ionic Liquid-based Colloidsmentioning

confidence: 99%

Section: Analyses Of the Samplementioning

confidence: 99%

Section: Decoupled Analysis Of the Optimal Counterion Concentrations At 1vol% Of Nanoparticlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Long-Term Stable Concentrated Colloidal Dispersions in Ionic Liquids up to 473 K

Riedl¹,

Sarkar²,

Fiuza³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Being immersed (or synthesized within) in an electrolyte solution, the nanoparticles acquire surface ions (e.g., hydroxyl groups, citrate, etc. [ 6 , 7 , 8 ]) resulting in a very large structural charge

(

). Its sign can be both positive or negative, depending on the surface group type.…”

Section: Introductionmentioning

confidence: 99%

The Ohm Law as an Alternative for the Entropy Origin Nonlinearities in Conductivity of Dilute Colloidal Polyelectrolytes

Chikina

Shikin

Varlamov

2020

Entropy

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We discuss the peculiarities of the Ohm law in dilute polyelectrolytes containing a relatively low concentration n of multiply charged colloidal particles. It is demonstrated that in these conditions, the effective conductivity of polyelectrolyte is the linear function of n . This happens due to the change of the electric field in the polyelectrolyte under the effect of colloidal particle polarization. The proposed theory explains the recent experimental findings and presents the alternative to mean spherical approximation which predicts the nonlinear I-V characteristics of dilute colloidal polyelectrolytes due to entropy changes.

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Printable and Homogeneous NiO_x Hole Transport Layers Prepared by a Polymer‐Network Gel Method for Large‐Area and Flexible Perovskite Solar Cells

Zhang

Wang

Duan

et al. 2021

Adv Funct Materials

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As one of the most promising hole transport layers (HTLs), nickel oxide (NiO x ) has received extensive attention due to its application in flexible largearea perovskite solar cells (PSCs). However, the poor interface contact caused by inherent easy-agglomeration phenomenon of NiO x nanoparticles (NPs) is still the bottleneck for achieving high-performance devices. Herein, a general strategy to synthesize NiO x NPs with high crystallinity and good dispersibility via the polymer network micro-precipitation method is reported. Promisingly, this approach realizes the flow-division of precipitant and the restraint of the NPs motion, thereby effectively alleviating the coagulation phenomenon caused by excessive local concentration and secondary movement adsorption. Furthermore, the addition of ionic liquid not only inhibits the secondary aggregation of NiO x NPs during the dispersion process, but also significantly enhances the properties of the colloidal solution. Ultimately, the 1.01 cm 2 PSCs based on the optimized NiO x HTLs achieve the champion power conversion efficiency of 20.91% and 19.17% on rigid and flexible substrates, respectively. Moreover, the reproducibility and stability of PSCs are also significantly improved, especially for flexible devices. Overall, this strategy provides the possibility for flexible, large-area fabrication of high-quality NiO x HTLs to promote the development of stable and efficient perovskite devices.

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Colloidal dispersions of oxide nanoparticles in ionic liquids: elucidating the key parameters

Abstract: Key parameters were identified to obtain long-term stable ionic liquid-based colloids.

Cited by 35 publications

References 56 publications

Design of Long-Term Stable Concentrated Colloidal Dispersions in Ionic Liquids up to 473 K

Design of Long-Term Stable Concentrated Colloidal Dispersions in Ionic Liquids up to 473 K

The Ohm Law as an Alternative for the Entropy Origin Nonlinearities in Conductivity of Dilute Colloidal Polyelectrolytes

Printable and Homogeneous NiO_x Hole Transport Layers Prepared by a Polymer‐Network Gel Method for Large‐Area and Flexible Perovskite Solar Cells

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Colloidal dispersions of oxide nanoparticles in ionic liquids: elucidating the key parameters

Abstract: Key parameters were identified to obtain long-term stable ionic liquid-based colloids.

Cited by 35 publications

References 56 publications

Design of Long-Term Stable Concentrated Colloidal Dispersions in Ionic Liquids up to 473 K

Design of Long-Term Stable Concentrated Colloidal Dispersions in Ionic Liquids up to 473 K

The Ohm Law as an Alternative for the Entropy Origin Nonlinearities in Conductivity of Dilute Colloidal Polyelectrolytes

Printable and Homogeneous NiOx Hole Transport Layers Prepared by a Polymer‐Network Gel Method for Large‐Area and Flexible Perovskite Solar Cells

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Product

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Printable and Homogeneous NiO_x Hole Transport Layers Prepared by a Polymer‐Network Gel Method for Large‐Area and Flexible Perovskite Solar Cells