Liquid-liquid interface as scaffold for self-assembly of nanostructures into functional materials

Ali, M. Azam; Ghosh, Sujit Kumar

doi:10.1016/b978-0-12-816770-0.00031-9

Cited by 6 publications

(8 citation statements)

References 137 publications

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“…The tendency of particles to selfassemble at the liquid−liquid or liquid−gas interface has recently been garnered toward various applications including structured materials and energy storage. 14 The thickness and molecular properties of the interfacial layer are likely to play an important role in the self-assembly mechanism. Nevertheless, the question of what determines the thickness of an interface has not been yet sufficiently discussed.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The same is true for nanobubbles. The tendency of particles to self-assemble at the liquid–liquid or liquid–gas interface has recently been garnered toward various applications including structured materials and energy storage . The thickness and molecular properties of the interfacial layer are likely to play an important role in the self-assembly mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Negative Pressure within a Liquid–Fluid Interface Determines Its Thickness

Srebnik

Marmur

2020

Langmuir

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The density within the interface between two fluid phases at equilibrium gradually changes from that of one phase to that of the other. The main change in density, according to experimental measurements, practically occurs over a finite distance of O [1 nm]. If we assume that the average stress difference within the interface is on the order of magnitude of ambient pressure, then the Bakker equation implies that for a liquid with surface tensions, say ∼50 mN/m, we get an interface thickness of ∼500 nm. This is certainly too big because it contradicts experimental findings. Alternatively, if the thickness is assumed to be O [10 nm] or less, as is usually believed, the average stress difference must be ∼5 × 10 6 N/m 2 or bigger, which is surprisingly high. This paper shows using a few approaches that such a high average stress difference is due to negative stresses in the interface.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Negative Pressure within a Liquid–Fluid Interface Determines Its Thickness

Srebnik

Marmur

2020

Langmuir

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“…A liquid–liquid interface, the boundary between two immiscible liquids, creates a heterogeneous system that differs from either bulk liquid. Such differing properties as changeable interface morphologies and variable interfacial tensions alter the structure, kinetics, and thermodynamics of particles nucleating at the interface Figure A shows an obvious oil–water interface.…”

Section: Resultsmentioning

confidence: 99%

The Roles of Oil–Water Interfaces in Forming Ultrasmall CaSO₄ Nanoparticles

Wang,

Zhu,

Gupta

et al. 2024

ACS Appl. Mater. Interfaces

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In natural and engineered environmental systems, calcium sulfate (CaSO 4 ) nucleation commonly occurs at dynamic liquid−liquid interfaces. Although CaSO 4 is one of the most common minerals in oil spills and oil−water separation, the mechanisms driving its nucleation at these liquid−liquid interfaces remain poorly understood. In this study, using in situ small-angle Xray scattering (SAXS), we examined CaSO 4 nucleation at oil−water interfaces and found that within 60 minutes of reaction, short rodshaped nanoparticles (with a radius of gyration (R g ) of 17.2 ± 2.7 nm and a length of 38.2 ± 5.8 nm) had formed preferentially at the interfaces. Wide-angle X-ray scattering (WAXS) analysis identified these nanoparticles as gypsum (CaSO 4 •2H 2 O). In addition, spherial nanoparticles measuring 4.1 nm in diameter were observed at oil− water interfaces, where surface-enhanced Raman spectroscopy (SERS) revealed an elevated pH compared to the bulk solution. The negatively charged oil−water interfaces preferentially adsorb calcium ions, collectively promoting CaSO 4 formation there. CaSO 4 particle formation at the oil−water interface follows a nonclassical nucleation (N-CNT) pathway by forming ultrasmall amorphous spherical particles which then aggregate to form intermediate nanoparticles, subsequently growing into nanorod-shaped gypsum. These findings of this study provide insights into mineral scaling during membrane separation and can inform more efficient oil transport in energy recovery systems.

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“…6 Liquid/liquid interfaces applied as a scaffold for the production of self-assembled nanostructures. 7 Special thermodynamic properties such as viscosity and density are changed in liquid/liquid interface with nanometer thickness. Self-assembly, the unique property of the liquid/liquid interfaces can lead to the formation of well-ordered nanostructures 8 ; because NPs are mobile at this region and obtain an equilibrium assembly via the interfacial energy reduction.…”

Section: Introductionmentioning

confidence: 99%

“…Trimetallic catalysts, composed of elements like platinum (Pt), palladium (Pd), and a third metal, have demonstrated substantial potential for enhancing the catalytic activity and stability of methanol oxidation 6 . Liquid/liquid interfaces applied as a scaffold for the production of self‐assembled nanostructures 7 . Special thermodynamic properties such as viscosity and density are changed in liquid/liquid interface with nanometer thickness.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Performance and Tolerance to Carbon Monoxide Poisoning of CoO/PtPd/r‐GO Nanocomposite Thin Film for Methanol Fuel Cells

Eskandari,

Hoseini,

Bahrami

et al. 2024

Applied Organom Chemis

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This study presents the facile synthesis of CoO/PtPd and CoO/PtPd/reduced‐graphene oxide (r‐GO) nanocomposites, highlighting their significant role in methanol fuel cells. To create a CoO/PtPd thin film at the toluene/water interface, we employed NaBH4 to effectively reduce PtCl2(COD), PdCl2(COD), and Co (acac)3 (COD = cis,cis‐1,5‐ cyclooctadiene, acac = acetylacetonate). The two nanocomposites were analyzed using XRD, FE‐SEM, AFM, XPS, BET, and TEM techniques. In the electrooxidation of methanol in the anodic part of fuel cell, cobalt (II) oxide can serve as an oxygen source in the catalytic oxidation of carbon monoxide (CO) or it can play a role in producing the HO‐CoO intermediate to facilitate the oxidation of CO‐PtPd to carbon dioxide (CO2). This reaction can help eliminate CO, which is a common poison for Pt‐based catalysts in methanol oxidation. Our research reveals significant improvements in current densities and catalyst tolerance when using the CoO/PtPd/r‐GO nanocomposite thin film. The observed current density for CoO/PtPd/r‐GO is 263.33 mA.cm−2, surpassing the reported value of 30.00 mA.cm−2 for PtPd/r‐GO. The jf/jb ratios, commonly used to evaluate catalyst tolerance, are approximately 2.80 for CoO/PtPd and 4.98 for CoO/PtPd/r‐GO, in contrast to ratios larger than 0.99 for ETEK Pt and 0.58 for other types of commercial Pt/C. These findings indicate that the CoO/PtPd/r‐GO thin film exhibits enhanced catalytic performance and improved tolerance to CO poisoning. Furthermore, the power output calculated for CoO/PtPd/r‐GO is 104.5 mW·cm−2, which is comparable to the reported value of 48.03 mW·cm−2 for commercial Pt/C. These results demonstrate the potential of the CoO/PtPd/r‐GO nanocomposite thin film as a promising alternative to traditional catalyst materials in methanol fuel cells.

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Liquid-liquid interface as scaffold for self-assembly of nanostructures into functional materials

Cited by 6 publications

References 137 publications

Negative Pressure within a Liquid–Fluid Interface Determines Its Thickness

Negative Pressure within a Liquid–Fluid Interface Determines Its Thickness

The Roles of Oil–Water Interfaces in Forming Ultrasmall CaSO₄ Nanoparticles

Enhanced Catalytic Performance and Tolerance to Carbon Monoxide Poisoning of CoO/PtPd/r‐GO Nanocomposite Thin Film for Methanol Fuel Cells

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Liquid-liquid interface as scaffold for self-assembly of nanostructures into functional materials

Cited by 6 publications

References 137 publications

Negative Pressure within a Liquid–Fluid Interface Determines Its Thickness

Negative Pressure within a Liquid–Fluid Interface Determines Its Thickness

The Roles of Oil–Water Interfaces in Forming Ultrasmall CaSO4 Nanoparticles

Enhanced Catalytic Performance and Tolerance to Carbon Monoxide Poisoning of CoO/PtPd/r‐GO Nanocomposite Thin Film for Methanol Fuel Cells

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The Roles of Oil–Water Interfaces in Forming Ultrasmall CaSO₄ Nanoparticles