Fine-Tuning Nanoparticle Packing at Water–Oil Interfaces Using Ionic Strength

Chai, Yi; Lukito, Alysia; Jiang, Yufeng; Ashby, Paul D.; Russell, Thomas P.

doi:10.1021/acs.nanolett.7b03462

Cited by 116 publications

(136 citation statements)

References 25 publications

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Section: Assembly Dynamics and In Situ Characterization Of Nanomatementioning

confidence: 99%

“…Costa et al performed in situ AFM to support reciprocal space structures obtained from GISAXS . Chai et al used in situ AFM at the oil–water interface to relate pendant drop tensiometry measurements to adsorption kinetics and areal densities of NP surfactants (Figure a) . Recently, the latter group have further refined their technique and used it to interrogate the structure and mechanical properties of polyoxometalates and colloidal nanocrystals at the liquid–liquid interface …”

Section: Assembly Dynamics and In Situ Characterization Of Nanomatementioning

confidence: 99%

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Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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imparts novel mechanical and functional properties to the macroscopic interface itself. These properties include size-and charge-selective pathways for molecules and particulates, shear and compressive moduli, and selective binding and reaction sites. Complex interfaces can then be used to generate complex, macroscopic, all-liquid materials with very high surface areas that have unique properties, such as compartmentalization, communication between compartments, and the ability to move and reconfigure. With the rapid growth in the study of complex materials made from interfacially structured liquids, there is a need to review the field from the funda-Liquid-fluid interfaces provide a platform both for structuring liquids into complex shapes and assembling dimensionally confined, functional nanomaterials. Historically, attention in this area has focused on simple emulsions and foams, in which surface-active materials such as surfactants or colloids stabilize structures against coalescence and alter the mechanical properties of the interface. In recent decades, however, a growing body of work has begun to demonstrate the full potential of the assembly of nanomaterials at liquid-fluid interfaces to generate functionally advanced, biomimetic systems. Here, a broad overview is given, from fundamentals to applications, of the use of liquid-fluid interfaces to generate complex, all-liquid devices with a myriad of potential applications. Figure 2.Interactions between particles attached to liquid-fluid interfaces. a) Dipole-dipole interactions between adsorbed particles due to asymmetric charge distributions near the surface of particles at interfaces. Reproduced with permission. [34] Copyright 1980, American Physical Society. b) Dipole-dipole interactions give rise to 2D colloidal crystals with large lattice spacings. Scale bar, 50 µm. Reproduced with permission. [36]

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Section: Assembly Dynamics and In Situ Characterization Of Nanomatementioning

confidence: 99%

Section: Assembly Dynamics and In Situ Characterization Of Nanomatementioning

confidence: 99%

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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“…[2,[22][23][24][25][26] Here,u nlike in colloidosomes, [1,27] colloidal capsules, [28][29][30] or Pickering emulsions, [31][32][33][34] which are stabilized with micronsized particles (Scheme 1a), functionalized nanoparticles dispersed in an aqueous phase interact with end-functionalized oligomeric ligands dissolved in an oil phase at the interface to form nanoparticle surfactants (NP-surfactants; Scheme 1b), where the number of ligands anchored to the NPs is self-regulated to minimize the energy holding each NPsurfactant at the interface. [35][36][37] Aside from through altering the size of the particles, DE can also be controlled by changing the surface chemistry of the NPs,o re ven by using heterogeneous surface chemistries to generate so-called Janus particles. NP-surfactants constitute av ersatile alternative to Pickering emulsions and afford ap athway to generate adaptive interfacial assemblies that can respond to external stimuli.…”

Section: Nanoparticle Assemblies At Liquid-liquid Interfaces Openmentioning

confidence: 99%

“…NP-surfactants constitute av ersatile alternative to Pickering emulsions and afford ap athway to generate adaptive interfacial assemblies that can respond to external stimuli. [35][36][37] Aside from through altering the size of the particles, DE can also be controlled by changing the surface chemistry of the NPs,o re ven by using heterogeneous surface chemistries to generate so-called Janus particles. [38] This is ap articularly useful mechanism for nanometer-sized particles for which the binding energy is negligible because of the screening of the oil-water interface,a nd so heterogeneous surface chemistry provides the thermodynamic driving force for assembly at the interface.…”

Section: Nanoparticle Assemblies At Liquid-liquid Interfaces Openmentioning

confidence: 99%

Interfacial Activity of Amine‐Functionalized Polyhedral Oligomeric Silsesquioxanes (POSS): A Simple Strategy To Structure Liquids

Hou

et al. 2019

Angew Chem Int Ed

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“…Although PS-NH2 (Mw = 13 k) and PS-NH2 (Mw = 2.5 k) exhibited a similar ability to reduce the O/W interfacial tension in the presence of CNCs, it took a longer time for the former/CNCs to reach interfacial equilibrium. The assembly of carboxylated SiO2 as NPs in water and PDMS-NH2 as the surfactant in silicon oil also reduced the O/W interfacial tension, according to Chai et al [11] . The introduction of salt increased the ionic strength of water and further decreased the O/W interfacial tension.…”

Section: Introductionmentioning

confidence: 84%

Synthesis of Aminated Polystyrene and Its Self-assembly with Nanoparticles at Oil/water Interface

Shi¹,

Yang²,

Li³

et al. 2020

Preprint

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Nanoparticle (NP)-surfactants formed by the self-assembly of NPs and endfunctionalized polymers at the hydrophilic/hydrophobic interface have a wide range of Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 4 March 2020 applications in many fields. In this study, the influence of density of amino groups, NPs dimension and pH on the interaction between end-functionalized polymers and NPs were extensively investigated. Single amino-terminated polystyrene (PS-NH2, Mw ≈ 0.6k, 2.5k, 3.5k, 3.9k) and diamino-terminated polystyrene (H2N-PS-NH2, Mw ≈ 1.1k, 2.8k) were prepared using reversible addition-fragmentation chain transfer polymerization and atom transfer radical polymerization. NPs with different dimensions (zero-dimensional carbon dots with sulfonate groups, one-dimensional cellulose nanocrystals with sulfate groups and two-dimensional graphene with sulfonate groups) in the aqueous phase were added into the toluene phase containing the aminated PS. The influence of pH and the molecular weight of amino-terminated PS on the interfacial tension between two phases were investigated. The results indicate that aminated PS exhibited the strongest interfacial activity after compounding with sulfonated NPs at a pH of 3. Terminating PS with amino groups on both ends leads to better performance in in reducing the water/toluene interfacial tension than modifying the molecular structure of PS on a single end. The dimension of sulfonated NPs also contributed significantly to the reduction of the water/toluene interfacial tension. The minimal interfacial tension was 4.49 mN/m after compounding PS-NH2 with sulfonated zero-dimensional carbon dots. Molecular dynamics simulation on the evolution of the water/toluene interface in the presence of sulfonated carbon dots and H2N-PS-NH2 revealed that these opposite charged substances moved towards the interface in an extreme short time and orderly assembled in a thermodynamic equilibrium.A mixture of potassium phthalimide (2.13 g), PS 3a (2.51 g) and DMF (30 mL) was heated at 80 °C for 12 h under argon. Then, the mixture was added to water, and the product 3b was prepared by filtration [17] . Synthesis of H2N-PS-NH2 (3c)Product 3b (1.83 g), hydrazine hydrate (1.05 g) and DMF (25 mL) were added to a three-neck flask. The mixture was stirred at 80 °C for 16 h under argon. The mixture was added to methanol, and the precipitate was washed with deionized water and brine.Then, H2N-PS-NH2 3c was obtained. The chemical structure of 3a, 3b and 3c was characterized by 1 H NMR, and the spectra are shown in Figure 2. Figure 2. 1 H NMR spectra of 3a, 3b and 3c; A: Ar-H, B: Ph-CH-Br, C: phthalimide-CH2. Synthesis of CDs-SO3HCitric acid (8.01 g) was added to deionized water (100 mL). The mixture was sonicated and transferred to a hydrothermal kettle. The reaction was carried out at 200

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Fine-Tuning Nanoparticle Packing at Water–Oil Interfaces Using Ionic Strength

Cited by 116 publications

References 25 publications

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Interfacial Activity of Amine‐Functionalized Polyhedral Oligomeric Silsesquioxanes (POSS): A Simple Strategy To Structure Liquids

Synthesis of Aminated Polystyrene and Its Self-assembly with Nanoparticles at Oil/water Interface

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