Two-dimensional glass transition–like behavior of Janus particle–laden interface

Correia, Elton L.; Winter, H. Henning; Razavi, Sepideh

doi:10.1007/s00397-023-01389-w

Cited by 5 publications

(6 citation statements)

References 91 publications

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“…97 Moreover, the surface pressure of JPs monolayers have also been shown to impact their resulting interfacial rheology. 98 Consequentially, this illustrates the opportunity to use the capillary interactions as a tool to tune the properties of interfacial systems. 99,100 Understanding these concepts is…”

Section: Discussionmentioning

confidence: 97%

Janus particle amphiphilicity and capillary interactions at a fluid interface

Correia,

Razavi

2023

AIChE Journal

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Studying the behavior of anisotropic particles at fluid interfaces is a rapidly expanding field, as understanding how the introduced anisotropy affects the resulting properties is essential in the engineering of interfacial systems. Surface anisotropic particles, also known as Janus particles (JPs), offer new possibilities for novel applications due to their amphiphilicity and stronger binding to fluid interfaces compared to homogeneous particles. Introducing surface anisotropy creates complexity as the orientation of interfacially bound particles affects interparticle interactions, a contributing factor to the microstructure formation. In this work, we have investigated the microstructure of JP monolayers formed at the air–water interface using particles with different degrees of amphiphilicity and examined the response of the networks to applied compressions. Our findings demonstrate that JPs amphiphilicity is a crucial factor governing their orientation at the interface, which in turn dictates the complexity of the capillary interactions present and the mechanical properties of the ensuing networks.

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Section: Discussionmentioning

confidence: 97%

Janus particle amphiphilicity and capillary interactions at a fluid interface

Correia,

Razavi

2023

AIChE Journal

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“…The interaction parameters with the oil and the water have been determined by matching the available experimental data on the three-phase contact angle of particles at the oil–water interface . This case was marked as the nanoparticle F; for the rest of the JP cases, the interaction parameter between each face of the Janus particle and the fluid phases were altered in order to simulate JPs with different degrees of amphiphilicity . The hydrophobic NPs (type A) and hydrophilic NPs (type G) used in our simulation represent APSL and gold, respectively, exhibiting surface characteristics corresponding to JP type F.…”

Section: Methodsmentioning

confidence: 99%

Effects of Nanoparticle Wettability on the Meniscus Stability of Oil–Water Systems: A Coarse-Grained Modeling Approach

Nguyen,

Razavi,

Papavassiliou

2024

J. Phys. Chem. B

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A coarse-grained modeling approach is employed to probe the effect of nanoparticles and their wettability on the stability of the interface between two immiscible fluids. In this study, pure oil (dodecane) and water are placed side by side in a nanochannel, forming a meniscus. Homogeneous hydrophilic nanoparticles, Janus particles, and homogeneous hydrophobic nanoparticles are placed at the oil−water interface, and their dynamics are studied as they rearrange at the oil−water interface. The results show that when the water is set in motion, two instabilities occur: the formation of fingers and the detachment of water from the channel wall. It is observed that the formation of fingers is affected by the wettability of the nanoparticles. The second instability may lead to the formation of a drop that propagates through the channel. However, it is found that the wetting properties of the nanoparticles do not affect the critical flow rate for the detachment of the water from the wall. Therefore, detachment occurs at the same three-phase contact angle regardless of the nanoparticle wetting properties. These findings can be important for industrial applications such as enhanced oil recovery, separation technologies, and microfluidic and nanofluidic technologies.

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“…To examine the shear response of monolayers at different particle surface coverages, we have integrated a ribbon trough (Biolin Scientific) with a custom designed double wall ring (DWR) geometry [75] on a DHR2 stress-controlled rheometer (TA instruments) following the work of Vermant and coworkers (see figure S2) [90,91]. Details on the specifics of the setup and preparation of the particle-laden interfaces, at various surface pressures in the range of 0-40 mN m −1 , are provided in the supporting information.…”

Section: Interfacial Shear Rheologymentioning

confidence: 99%

“…shear mode) [72], provide insight on important attributes of particleladen interfaces. An example of such interfacial characteristic is the yield point of the particle network beyond which the interfacial microstructure breaks down in response to the applied stresses and the material begins to flow [50,[73][74][75]. Interfacial rheology can thus be employed in characterizing the ability of an interface to resist distortion and deformation, key factors when attempting to control the thin film drainage and retard or arrest bubble coarsening in foams [76,77].…”

Section: Introductionmentioning

confidence: 99%

Interfacial rheology insights: particle texture and Pickering foam stability

Brown

Peña

Razavi

2023

J. Phys.: Condens. Matter

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Interfacial rheology studies were conducted to establish a connection between the rheological characteristics of particle-laden interfaces and the stability of Pickering foams. The behavior of foams stabilized with fumed and spherical colloidal silica particles was investigated, focusing on foam properties such as bubble microstructure and liquid content. Compared to a sodium dodecyl sulfate-stabilized foam, Pickering foams exhibited a notable reduction in bubble coarsening. Drop shape tensiometry measurements on particle-coated interfaces indicated that the Gibbs stability criterion was satisfied for both particle types at various surface coverages, supporting the observed arrested bubble coarsening in particle-stabilized foams. However, although the overall foam height was similar for both particle types, foams stabilized with fumed silica particles demonstrated a higher resistance to liquid drainage. This difference was attributed to the higher yield strain of interfacial networks formed by fumed silica particles, as compared to those formed by spherical colloidal particles at similar surface pressures. Our findings highlight that while both particles can generate long-lasting foams, the resulting Pickering foams may exhibit variations in microstructure, liquid content, and resistance to destabilization mechanisms, stemming from the respective interfacial rheological properties in each case.

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Two-dimensional glass transition–like behavior of Janus particle–laden interface

Cited by 5 publications

References 91 publications

Janus particle amphiphilicity and capillary interactions at a fluid interface

Janus particle amphiphilicity and capillary interactions at a fluid interface

Effects of Nanoparticle Wettability on the Meniscus Stability of Oil–Water Systems: A Coarse-Grained Modeling Approach

Interfacial rheology insights: particle texture and Pickering foam stability

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