Modelling the self orientation of particles in a film

Morris, G.; Neethling, S.J.; Cilliers, J.J.

doi:10.1016/j.mineng.2011.09.015

Cited by 16 publications

(13 citation statements)

References 17 publications

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“…We investigate how a bamboo foam repositions and reorients such objects, and probe in detail the forces exerted on the descending object by the foam as well as the perturbation caused to the film. Our work extends the contributions by Morris et al [27][28][29], which probe how objects such as cubes or ellipsoids and their orientations and surface properties affect the stability of a thin film by which they are held. There are also many related contributions in biology, as reviewed by Dasgupta et al [30], that show how fluid interfaces and biological membranes interact with particles of different shapes, and we see similar perturbations of the soap film in this work.…”

Section: Introductionsupporting

confidence: 69%

Simulating the interaction between a descending super-quadric solid object and a soap film

Davies¹

2018

Proc. R. Soc. A.

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We investigate the interaction that occurs between a light solid object and a horizontal soap film of a ‘bamboo’ foam contained in a cylindrical tube. We vary the shape of the descending object from a sphere to a cube by changing a single shape parameter. We investigate in detail how the soap film deforms and determine the forces that the film exerts on the object, depending on the radius of the cylindrical tube, and the shape, orientation and position of the object. We show that a cubic particle in a particular orientation experiences the largest drag force, and that this orientation is also the most likely outcome of dropping a cube from an arbitrary orientation through a bamboo foam.

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Section: Introductionsupporting

confidence: 69%

Simulating the interaction between a descending super-quadric solid object and a soap film

Davies¹

2018

Proc. R. Soc. A.

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“…For instance nanocubes self-assemble into graphenelike honeycomb and hexagonal lattices [17,18,19,20] or the pattern can be tuned as the particle shape changes from a sharp cube to a rounded cube [20]. The capillary deformation induced by adsorbed cubes depends on the Young's contact angle [21,22]. The orientation of a single cube at the interface drives the interface deformation and the arrangement.…”

Section: Introductionmentioning

confidence: 99%

Effect of gravity on the orientation and detachment of cubic particles adsorbed at soap film or liquid interfaces

Davies

Raufaste

2021

Soft Matter

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“…Important issues are the equilibrium configuration of the particle at the interface [28][29][30][31] and the adsorption energy [32-34] which depend on the particle shape and chemical properties. A common approximation (following Pieranski [3]) is to assume the fluid-fluid interface to be flat even when the particle is adsorbed, i.e., to ignore the capillary deformations induced by the particle.…”

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confidence: 99%

Self-Assembly of Cubes into 2D Hexagonal and Honeycomb Lattices by Hexapolar Capillary Interactions

2016

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Particles adsorbed at a fluid-fluid interface induce capillary deformations that determine their orientations and generate mutual capillary interactions which drive them to assemble into 2D ordered structures. We numerically calculate, by energy minimization, the capillary deformations induced by adsorbed cubes for various Young's contact angles. First, we show that capillarity is crucial not only for quantitative, but also for qualitative predictions of equilibrium configurations of a single cube. For a Young's contact angle close to 90°, we show that a single-adsorbed cube generates a hexapolar interface deformation with three rises and three depressions. Thanks to the threefold symmetry of this hexapole, strongly directional capillary interactions drive the cubes to self-assemble into hexagonal or graphenelike honeycomb lattices. By a simple free-energy model, we predict a density-temperature phase diagram in which both the honeycomb and hexagonal lattice phases are present as stable states. DOI: 10.1103/PhysRevLett.116.258001 Over a century ago, it had already been observed that submm sized particles strongly adsorb at fluid-fluid interfaces [1,2]. Indeed, a fluid-fluid interface of area A and surface tension γ has a free energy cost γA, and particles can reduce A by adsorbing at the interface. The bonding potential is usually strong enough to allow stable monolayers of particles. Since a pioneering study by Pieranski [3], a lot of interest has been devoted to these quasi-2D systems, which have many applications, e.g., emulsions [4][5][6][7][8][9], coatings [10,11], optics [12], and new material development [13]. Because of the contact angle constraint imposed by Young's Law, an adsorbed particle in general induces deformations in the shape of the fluid-fluid interface. These so-called capillary deformations are responsible for capillary interactions between the adsorbed particles [14,15], which regulate the particle self-assembly at the interface [16][17][18]. These interactions can be tuned by varying, e.g., the particle shape and chemistry [10,[19][20][21], or the curvature of the fluidfluid interface [22][23][24]. Very recent experiments [25][26][27] have shown that adsorbed nanocubes with truncated corners can assemble into graphenelike honeycomb and hexagonal lattices. The origin of these structures is unknown, although ligand adsorption and van der Waals forces between specific facets of the truncated cubes have been suggested [25]. In this Letter, however, we show that generic cubes with homogeneous surface properties generate hexapolar capillary deformations which are largely responsible for the observed structures. Cubes of other materials or dimensions could, therefore, form similar structures.A primary step for understanding adsorbedparticle systems is the study of an isolated particle at a macroscopically flat fluid-fluid interface. Important issues are the equilibrium configuration of the particle at the interface [28][29][30][31] and the adsorption energy [32-34] which depend on the particl...

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Modelling the self orientation of particles in a film

Cited by 16 publications

References 17 publications

Simulating the interaction between a descending super-quadric solid object and a soap film

Simulating the interaction between a descending super-quadric solid object and a soap film

Effect of gravity on the orientation and detachment of cubic particles adsorbed at soap film or liquid interfaces

Self-Assembly of Cubes into 2D Hexagonal and Honeycomb Lattices by Hexapolar Capillary Interactions

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