Particles Adsorbed at the Oil−Water Interface:  A Theoretical Comparison between Spheres of Uniform Wettability and “Janus” Particles

and, B. P. Binks; Fletcher, Paul D. I.

doi:10.1021/la0103315

Cited by 545 publications

(592 citation statements)

References 8 publications

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“…The differences between the simulation and predicted interaction potentials are likely due to the neglect of capillary waves in the macroscopic theories. 28,27 For D s 0 the free energy profile is asymmetric, with the degree of asymmetry increasing with D. As has been previously noted, 19 despite not being amphiphilic such particles are often surface-active (adhere to the interface). The detachment energies DF A/B (i.e.…”

Section: Resultsmentioning

confidence: 66%

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Stability of Janus nanoparticles at fluid interfaces

Cheung

Bon

2009

Soft Matter

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Using Monte Carlo simulations the interaction of a nanometre-sized, spherical Janus particle (a particle with two distinct surface regions of different functionality, in this case showing amphiphilic behaviour) with an ideal fluid interface is studied. In common with previous simulations of spherical, isotropic particles, the range of the nanoparticle-interface interaction is significantly larger than the nanoparticle radius due to the broadening of the interface due to capillary waves. For a uniform particle (an isotropic particle with one surface characteristic) the stability of the particle at a liquid interface is decreased as the affinity for one liquid phase is increased relative to the other; for large affinity differences the detachment energies calculated from continuum theory become increasingly accurate. For a symmetric Janus particle (where the two different surface regions are of equal area), the presence of the particle at the interface becomes more stable upon increasing the difference in affinity between the two faces, with each face having a high affinity for the respective liquid phase. In the case studied here, where surface tension between the A-region of the particle with the A-component is identical to the surface tension between the B-region and B-component, the interaction is symmetric with respect to the nanoparticle interface separation. The particle is found to have a large degree of orientational freedom, in sharp contrast to micrometre-sized colloidal particles. Comparison with continuum theory shows that this significantly overestimates the detachment energy, due to its neglect of nanoparticle rotation; simulations of nanoparticles with fixed orientations show a considerably larger detachment energy. As the areas of the surface regions become asymmetric the stability of the Janus nanoparticle is decreased and, in the case of large differences in affinities of the two faces, the difference between detachment energies from simulation and continuum theory diminishes.

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Section: Resultsmentioning

confidence: 66%

“…Theoretical analysis of a mm-sized Janus particle predicts that the detachment energy is given by 19,43 …”

Section: Symmetric Janus Nanoparticlesmentioning

confidence: 99%

Stability of Janus nanoparticles at fluid interfaces

Cheung

Bon

2009

Soft Matter

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“…The relative areas of the polar and apolar particle surface regions are parameterized by the angle a. b denotes the immersion angle of the particle at the oil/water interface. 52 Reprinted with permission from The relative areas of the polar and apolar surface regions define the average contact angle (h average ) according to:…”

Section: Janus-type Nanoparticle Assembly At Fluid Interfacesmentioning

confidence: 99%

“…As discussed by Binks and Fletcher, amphiphilic Janus particles can exhibit an interfacial activity several times higher than simple homogeneous particles. 52 Janus particles combine the amphiphilic character of surfactants and the physical properties of nanoparticles, which opens new opportunities in emerging areas of nanotechnology and emulsions stabilization. Recently, Perro et al 53 reviewed the developments in the field of Janus particles during the last fifteen years, describing various strategies to obtain Janus-type particles using polymer precursors.…”

Section: Janus-type Nanoparticle Assembly At Fluid Interfacesmentioning

confidence: 99%

Self-assembly of nanoparticles at interfaces

et al. 2007

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Developments in the assembly of nanoparticles at liquid-liquid interfaces are reviewed where the assemblies can be controlled by tuning the size of the nanoparticles and the chemical characteristics of the ligands. Both synthetic and biological nanoparticles are discussed. By controlling the type of ligands, uniform and Janus-type nanoparticles can be produced where, at liquid-liquid interfaces, subsequent reactions of the ligands can be used to generate crosslinked sheets of nanoparticles at the interface that have applications including novel encapsulants, filtration devices with well-defined porosities, and controlled release materials. By controlling the size and volume fraction of the nanoparticles and the chemical nature of the ligands, nanoparticle-polymer composites can be generated where either enthalpy or entropy can be used to control the spatial distribution of the nanoparticles, thereby, producing auto-responsive materials that self-heal, self-corral assemblies of nanoparticles, or self-direct morphologies. Such systems hold great promise for generating novel optical, acoustic, electronic and magnetic materials.

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“…In particular, Janus particles, with two sides of distinct compositions or textures, have many potential uses: electronic paper, where one needs to switch between black and white states [4]; optical, chemical or biological biosensors, where the two hemispheres will respond differently to stimuli [5]; anisotropic building blocks for supra-assemblies, allowing a greater variety of novel structures to be built [6]; functional surfactants, where each hemisphere likes or dislikes some other component [7]; or self-motile colloidal particles (swimmers), propelled by the different ways in which either hemisphere interacts with the surrounding medium [8].…”

Section: Spheresmentioning

confidence: 99%

Soft Janus, wrinkles and all

et al. 2016

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Right now you are probably sitting on a comfy cushion. This is most likely filled with polyurethane (PU) foam. PUs are very long molecules made up of many repeating units. If the repeating units are prepolymers -intermediate-mass building blocks -with more than two reactive end groups, a three-dimensional network will form -a rubber, or elastomer, which can behave elastically depending on the degree of network cross-linking.

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Particles Adsorbed at the Oil−Water Interface: A Theoretical Comparison between Spheres of Uniform Wettability and “Janus” Particles

Cited by 545 publications

References 8 publications

Stability of Janus nanoparticles at fluid interfaces

Stability of Janus nanoparticles at fluid interfaces

Self-assembly of nanoparticles at interfaces

Soft Janus, wrinkles and all

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