Influence of the contact angle of silica nanoparticles at the air–water interface on the mechanical properties of the layers composed of these particles

Zang, Duyang; Rio, Emmanuelle; Delon, Giles; Langévin, D.; Wei, B.; Binks, Bernard P.

doi:10.1080/00268976.2010.542778

Cited by 68 publications

(82 citation statements)

References 33 publications

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“…Zang et al also confirmed this results, showing that a coating using particles with properties in limit of the hydrophobic to hydrophilic regime presented the highest mechanical robustness for LM . For this study, silica‐based nanoparticles (≈20 nm) with different relative SiOH content and an AWCA in the range of 80–135° were used . However, Zhou et al found higher mechanical stability for the LM produced using particles with an AWCA of 132°, from a studied AWCA range of 84–132° .…”

Section: Liquid Marblessupporting

confidence: 65%

“…They attributed this result to the fact that the AWCA of particles was closer to 90°, because at this AWCA particles are more strongly bound to the liquid surface . This explanation was corroborated from other works that experimentally demonstrated higher mechanical robustness for a layer at the liquid‐air interface using particles with an AWCA of 90° . Zang et al also confirmed this results, showing that a coating using particles with properties in limit of the hydrophobic to hydrophilic regime presented the highest mechanical robustness for LM .…”

Section: Liquid Marblessupporting

confidence: 63%

See 1 more Smart Citation

The Potential of Liquid Marbles for Biomedical Applications: A Critical Review

Oliveira

Reis

Mano

2017

Adv Healthcare Materials

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Liquid marbles (LM) are freestanding droplets covered by micro/nanoparticles with hydrophobic/hydrophilic properties, which can be manipulated as a soft solid. The phenomenon that generates these soft structures is regarded as a different method to generate a superhydrophobic behavior in the liquid/solid interface without modifying the surface. Several applications for the LM have been reported in very different fields, however the developments for biomedical applications are very recent. At first, the LM properties are reviewed, namely shell structure, LM shape, evaporation, floatability and robustness. The different strategies for LM manipulation are also described, which make use of magnetic, electrostatic and gravitational forces, ultraviolet and infrared radiation, and approaches that induce LM self-propulsion. Then, very distinctive applications for LM in the biomedical field are presented, namely for diagnostic assays, cell culture, drug screening and cryopreservation of mammalian cells. Finally, a critical outlook about the unexplored potential of LM for biomedical applications is presented, suggesting possible advances on this emergent scientific area.

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Section: Liquid Marblessupporting

confidence: 65%

Section: Liquid Marblessupporting

confidence: 63%

The Potential of Liquid Marbles for Biomedical Applications: A Critical Review

Oliveira

Reis

Mano

2017

Adv Healthcare Materials

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“…7), in agreement with previous reports on the rheology of interfaces loaded with adsorbed particles or globular-shaped protein-polysaccharide hybrids. [37][38][39] Taking the cross-over between G 0 i and G 00 i as a measure of yielding, we find that the dynamic yield strain g y of the viscoelastic films increases in the following order: Tween 20 (0.4%) < PPO-PEO copolymer (3%) < no surfactant (3.8%) < PVA (4.8%). Overall, our comparative rheological evaluation suggests that the fast film formation ability and the higher yield strains of the viscoelastic interfacial films formed in the presence of silica particles and surface active polymers make the outer droplet sufficiently strong at short timescales to prevent the rupture of the thin oil film, thus allowing for the stabilization of the investigated double emulsions.…”

Section: Rheology Of Interfacial Filmmentioning

confidence: 97%

Stabilization mechanism of double emulsions made by microfluidics

et al. 2012

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The stability of double emulsions is crucial for their application as delivery systems and microcapsule templates. However, this stability is often challenged by many molecular species present in customized formulations and by the fast dynamics when microfluidic emulsification processes are used. With the help of designed single emulsion experiments, particle contact angle measurements and interfacial rheology, we investigate the stabilization mechanisms of typical double emulsion formulations containing colloidal particles in the middle oil phase and surfactants in the continuous aqueous phase. In contrast to the inefficient stabilization with conventional surfactants, we find that colloidal particles and surface active polymers are able to quickly form a strong elastic film at the oil-water interface that prevents rupture of the thin fluid separating adjacent droplets, thus providing an efficient means to stabilize double emulsions within the short timescales of microfluidic processes.

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“…This trend is consistent with experimental results on the silica nanoparticle layer at the water-air interface. 17 It can be understood from a simple physical picture. At large θ c , the nanoparticles ride high at the liquid/vapor interface and the separation between nanoparticles is solely controlled by the hard-core repulsion.…”

Section: B In-plane Structurementioning

confidence: 99%

“…[10][11][12][13] Many experimental studies have been devoted to investigate the factors controlling the behavior of nanoparticles at an interface, including their size, surface morphology, shape, materials polarizability, and coatings. [14][15][16][17][18] Some of these factors influence the location and orientation of individual nanoparticles; others influence their mutual interactions and assembly geometry. However, in experiments these factors are usually intertwined to yield collective effects and it is difficult to single out the effect of each factor alone.…”

Section: Introductionmentioning

confidence: 99%

Structure and diffusion of nanoparticle monolayers floating at liquid/vapor interfaces: A molecular dynamics study

Cheng

Grest

2012

The Journal of Chemical Physics

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Large-scale molecular dynamics simulations are used to simulate a layer of nanoparticles floating on the surface of a liquid. Both a low viscosity liquid, represented by Lennard-Jones monomers, and a high viscosity liquid, represented by linear homopolymers, are studied. The organization and diffusion of the nanoparticles are analyzed as the nanoparticle density and the contact angle between the nanoparticles and liquid are varied. When the interaction between the nanoparticles and liquid is reduced the contact angle increases and the nanoparticles ride higher on the liquid surface, which enables them to diffuse faster. In this case the short-range order is also reduced as seen in the pair correlation function. For the polymeric liquids, the out-of-layer fluctuation is suppressed and the short-range order is slightly enhanced. However, the diffusion becomes much slower and the mean square displacement even shows sub-linear time dependence at large times. The relation between diffusion coefficient and viscosity is found to deviate from that in bulk diffusion. Results are compared to simulations of the identical nanoparticles in 2-dimensions.

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Influence of the contact angle of silica nanoparticles at the air–water interface on the mechanical properties of the layers composed of these particles

Cited by 68 publications

References 33 publications

The Potential of Liquid Marbles for Biomedical Applications: A Critical Review

The Potential of Liquid Marbles for Biomedical Applications: A Critical Review

Stabilization mechanism of double emulsions made by microfluidics

Structure and diffusion of nanoparticle monolayers floating at liquid/vapor interfaces: A molecular dynamics study

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