Amphiphilic Janus Particles at Interfaces

Honciuc, Andrei

doi:10.1007/978-3-030-23370-9_4

Cited by 11 publications

(7 citation statements)

References 98 publications

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“…The processes of Pickering emulsion formation and stabilization by NPs have been well described in previous works [4,34]. It is important to note that the phase of the obtained emulsion is determined by the NPs' affinity to one phase or the other, according to Finkle [35] and Bancroft [36] rules.…”

Section: Discussionmentioning

confidence: 99%

NanoTraPPED—A New Method for Determining the Surface Energy of Nanoparticles via Pickering Emulsion Polymerization

Honciuc¹,

Negru²

2021

Nanomaterials

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Surface energy with its polar and disperse components describes the physicochemical state of nanoparticles’ (NPs) surfaces, and can be a valuable parameter for predicting their bulk behavior in powders. Here, we introduce a new method, namely, Nanoparticles Trapped on Polymerized Pickering Emulsion Droplets (NanoTraPPED), for measuring the surface energy of a series of silica NPs bearing various surface functional groups. The method consists in creating Pickering emulsions from vinyl bearing monomers, immiscible with water, whereas NPs of interest have a stabilizing role, and in the process, become trapped at the monomer/water interface of emulsion droplets. The Pickering emulsion is polymerized, and polymer microspheres (colloidosomes) decorated with NPs are obtained. NanoTraPPED relies on measuring contact angles from the immersion depth of nanoparticles at the interface of various polymer colloidosomes with the electron microscope. The contact angle values are used as input for the Owens-Wendt-Rabel-Kaelble (OWRK) model, to quantitatively determine the total surface energy with water γNP/water, air γNP, and the corresponding polar and dispersive interaction components of NPs carrying -NH2, -SH, -OH, -CN and -C8 surface functional groups, ranking these according to their polarity. Our findings were confirmed independently by calculating the interfacial desorption energies of NPs from contact angles.

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Section: Discussionmentioning

confidence: 99%

NanoTraPPED—A New Method for Determining the Surface Energy of Nanoparticles via Pickering Emulsion Polymerization

Honciuc¹,

Negru²

2021

Nanomaterials

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“…JNPs are asymmetric nanoparticles consisting of at least two lobes differing in their chemical composition or surface properties. The contrasting properties between lobes give rise to an intrinsic amphiphilic property resembling molecular surfactants [ 11 , 12 ]. With the help of these ligand-carrying amphiphilic JNPs, we emulsify molten paraffin wax to create o/w emulsions.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Metal Ions by Interfacially Active Janus Nanoparticles Supported by Wax Colloidosomes Obtained from Pickering Emulsions

Pauli

Honciuc²

2022

Nanomaterials

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Most common wastewater treatment technologies for ion extraction and recovery rely on pumping wastewater through ion-exchange columns, filled with surface-functionalized polymer microspheres. To avoid the energetically intensive process of pumping large quantities of water through ion-exchange columns, alternative technologies are being developed, such as water-floating membranes containing ligands. In this context, innovative materials could be deployed. Here, we report nanostructured paraffine wax microspheres capable of floating on water, a design based on Pickering emulsion technology, where Janus nanoparticles act both as emulsion stabilizers and as ligand carriers. In the process of emulsification of molten wax in water, followed by cooling, the branched polyethylenimine (bPEI) carrying Janus nanoparticles are trapped at the molten wax/water interface, forming spherical microspheres or colloidosomes decorated with nanoparticles. The paraffine wax colloidosomes stabilized by ligand-carrying Janus nanoparticles are capable of floating on water and show high metal ion extraction capacities towards Cr(VI), Co(II), Ni(II), Cu(II) and Zn(II). In addition, we demonstrate that the ions can be recovered from the colloidosomes and that the colloidosomes can withstand several extraction/recovery cycles with little or no loss in the absorption capacity

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“…are usually incorporated to stabilize the blend morphologies during phase separation so that materials with controllable structures and optimized performance can be obtained . Recently, Janus nanoparticles (JPs), which are anisotropic nanoparticles with at least two constituent parts, have been recognized as superior compatibilizers in comparison to traditional ones because their unique combination of anisotropy with the Pickering effect endows them with a strong affinity to the polymer domain interfaces. − By this means, the drawbacks of traditional compatibilizers such as detachment from interfaces and formation of micelles can be effectively avoided. , Currently, JPs have been utilized to compatibilize not only model systems for scientific studies but also blend materials of technological relevance, ,, which demonstrates their versatility for practical purposes.…”

Section: Introductionmentioning

confidence: 99%

Distinctive Morphology Modifiers for Polymer Blends: Roles of Asymmetric Janus Nanoparticles during Phase Separation

Wang

Lin

et al. 2020

J. Phys. Chem. B

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Janus nanoparticles (JPs), which are anisotropic nanoparticles with multiple constituting parts, have been recognized as superior compatibilizers for polymer-blend-based nanocomposites. However, so far, most studies focused on the effects of symmetric JPs on the phase separation dynamics of polymer blends, while the roles of asymmetric JPs during phase separation remain unclear. In this work, the phase separation dynamics of symmetric blends compatibilized by JPs with various compositions was studied by using dissipative particle dynamics (DPD) simulations. It was found that the blends compatibilized by asymmetric JPs tend to undergo morphological transitions from bicontinuous networks to droplets-in-matrix structures at the late stage of phase separation, which is due to the influence of asymmetric JPs on the energetically favored curvature of the interfaces between polymer domains. Such a mechanism is absent for symmetric JPs and other compatibilizers (e.g., triblock copolymers and homogeneous particles) because they lack the unique combination of chemical asymmetry with the particulate nature like the asymmetric JPs. Moreover, it was observed that the asymmetric JPs can stably localize at the interfaces and act as efficient compatibilizers only when the fraction of the minor constituent part exceeds a critical value. These findings not only shed light upon the roles of asymmetric JPs as compatibilizers but also indicate a promising strategy for designing polymer-blend-based nanocomposites with tailor-made structures.

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Amphiphilic Janus Particles at Interfaces

Cited by 11 publications

References 98 publications

NanoTraPPED—A New Method for Determining the Surface Energy of Nanoparticles via Pickering Emulsion Polymerization

NanoTraPPED—A New Method for Determining the Surface Energy of Nanoparticles via Pickering Emulsion Polymerization

Extraction of Metal Ions by Interfacially Active Janus Nanoparticles Supported by Wax Colloidosomes Obtained from Pickering Emulsions

Distinctive Morphology Modifiers for Polymer Blends: Roles of Asymmetric Janus Nanoparticles during Phase Separation

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