Forces between chemically structured substrates mediated by critical fluids

Sprenger, Monika; Schlesener, F.; Dietrich, S.

doi:10.1063/1.2178355

Cited by 36 publications

(69 citation statements)

References 50 publications

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“…Critical Casimir forces between homogeneous and chemically striped surfaces have been studied theoretically within mean-field theory (MFT) [40,41] and by using MC simulations [41][42][43] for the film geometry. The critical Casimir interaction between a spherical colloid and a chemically patterned surface has been studied by some of the present authors [44].…”

Section: Dashed Lines) the Center Of The Colloid Is Located At (A Anmentioning

confidence: 99%

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

et al. 2014

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Recent experiments have demonstrated a fluctuation-induced lateral trapping of spherical colloidal particles immersed in a binary liquid mixture near its critical demixing point and exposed to chemically patterned substrates. Inspired by these experiments, we study this kind of effective interaction, known as the critical Casimir effect, for elongated colloids of cylindrical shape. This adds orientational degrees of freedom. When the colloidal particles are close to a chemically structured substrate, a critical Casimir torque acting on the colloids emerges. We calculate this torque on the basis of the Derjaguin approximation. The range of validity of the latter is assessed via mean-field theory. This assessment shows that the Derjaguin approximation is reliable in experimentally relevant regimes, so that we extend it to Janus particles endowed with opposing adsorption preferences. Our analysis indicates that critical Casimir interactions are capable of achieving well-defined, reversible alignments both of chemically homogeneous and of Janus cylinders.

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Section: Dashed Lines) the Center Of The Colloid Is Located At (A Anmentioning

confidence: 99%

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

et al. 2014

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“…This may lead to interesting effects such as orientational ordering of non-spherical colloids in a critical solvent or anchoring of non-spherical particles at a wall. By varying the temperature the strength of this orientational interaction can be tuned and by changing chemically the preferences of the surfaces for the two species forming the solvent one can choose the sign of the interaction [18,40,41]. Motivated by this prospect we therefore extend our previous study of critical adsorption at a single non-spherical colloidal particle [42] to the case that in addition there is a planar wall present.…”

Section: Introductionmentioning

confidence: 99%

“…So far the theoretical investigations of the critical Casimir effect have been focused on the film geometry, realized either by homogeneous, planar, and parallel walls (see, e.g., Refs. [6,7,8,9,10,11,12,13,14,15,16,17] and references therein) or by chemically patterned [18] or geometrically structured substrates [19], as well as on spherical colloidal particles (see, e.g., Refs. [20,21,22,23] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Critical Casimir interaction of ellipsoidal colloids with a planar wall

Kondrat

Harnau

Dietrich

2009

The Journal of Chemical Physics

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Based on renormalization group concepts and explicit mean field calculations we study the universal contribution to the effective force and torque acting on an ellipsoidal colloidal particle which is dissolved in a critical fluid and is close to a homogeneous planar substrate. At the same closest distance between the substrate and the surface of the particle, the ellipsoidal particle prefers an orientation parallel to the substrate and the magnitude of the fluctuation induced force is larger than if the orientation of the particle is perpendicular to the substrate. The sign of the critical torque acting on the ellipsoidal particle depends on the type of boundary conditions for the order parameter at the particle and substrate surfaces, and on the pivot with respect to which the particle rotates.

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“…Several groups investigated the dependence of solvation force on the specific properties of confining solid substrates, namely the shape of the surface, its symmetry, some aspects of energy and geometrical heterogeneity, cf. [33][34][35]. In figure 6 we show the adsorption isotherms obtained for dimers (part a) and for 8-mers (part b).…”

Section: Resultsmentioning

confidence: 99%

Adsorption of chain molecules in pores with crystalline walls: a density functional approach

Bucior¹,

Patrykiejew²,

Sokołowski³

et al. 2009

Condens. Matter Phys.

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A microscopic density functional theory of adsorption of chain molecules on the attractive solid surfaces of crystalline symmetry is developed. The proposed approach is based on the expansions of one-particle functions into two-dimensional Fourier series. Illustrative calculations for dimers, 8-and 16-mers adsorbed on a (100) fcc crystal surface indicate the effect of the periodicity of the adsorbing potential on the structure of the adsorbed layer and thermodynamics of adsorption.

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Forces between chemically structured substrates mediated by critical fluids

Cited by 36 publications

References 50 publications

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques

Critical Casimir interaction of ellipsoidal colloids with a planar wall

Adsorption of chain molecules in pores with crystalline walls: a density functional approach

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