Phase formation in colloidal systems with tunable interaction

Carstensen, H.; Kapaklis, Vassilios; Wolff, Max

doi:10.1103/physreve.92.012303

Cited by 22 publications

(33 citation statements)

References 23 publications

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“…In addition, our transition features an upper critical dimension equal to the system dimensionality, implying meanfield critical exponents. This result calls for further theoretical and experimental investigations, including assessing the universality of the critical behavior in other systems exhibiting the LIPT scenario (25).…”

Section: Discussionmentioning

confidence: 99%

Mixed-order phase transition in a colloidal crystal

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Tierno

Casademunt

2017

Proc. Natl. Acad. Sci. U.S.A.

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Mixed-order phase transitions display a discontinuity in the order parameter like first-order transitions yet feature critical behavior like second-order transitions. Such transitions have been predicted for a broad range of equilibrium and nonequilibrium systems, but their experimental observation has remained elusive. Here, we analytically predict and experimentally realize a mixed-order equilibrium phase transition. Specifically, a discontinuous solid-solid transition in a two-dimensional crystal of paramagnetic colloidal particles is induced by a magnetic field $H$. At the transition field $H_{\text{s}}$, the energy landscape of the system becomes completely flat, which causes diverging fluctuations and correlation length $\xi\propto | H^2 - H_{\text{s}}^2|^{-1/2}$. Mean-field critical exponents are predicted, since the upper critical dimension of the transition is $d_{\text{u}}=2$. Our colloidal system provides an experimental test bed to probe the unconventional properties of mixed-order phase transitions

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Section: Discussionmentioning

confidence: 99%

Mixed-order phase transition in a colloidal crystal

Alert

Tierno

Casademunt

2017

Proc. Natl. Acad. Sci. U.S.A.

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“…An external electric field polarizes the particles and ion clouds in the solvent around them, inducing a (tunable) dipole-dipole interaction between the particles. Depending on the orientation of the external electric field with respect to the plane of particle confinement, the dipolar interaction potential can be either attractive [24][25][26][27] or repulsive [28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics and dynamics of two-dimensional systems with dipolelike repulsive interactions

2018

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Thermodynamics and dynamics of a classical two-dimensional system with dipolelike isotropic repulsive interactions are studied systematically using extensive molecular dynamics (MD) simulations supplemented by appropriate theoretical approximations. This interaction potential, which decays as an inverse cube of the interparticle distance, belongs to the class of very soft long-ranged interactions. As a result, the investigated system exhibits certain universal properties that are also shared by other related soft-interacting particle systems (like, for instance, the one-component plasma and weakly screened Coulomb systems). These universalities are explored in this article to construct a simple and reliable description of the system thermodynamics. In particular, Helmholtz free energies of the fluid and solid phases are derived, from which the location of the fluid-solid coexistence is determined. The quasicrystalline approximation is applied to the description of collective modes in dipole fluids. Its simplification, previously validated on strongly coupled plasma fluids, is used to derive explicit analytic dispersion relations for the longitudinal and transverse wave modes, which compare satisfactory with those obtained from direct MD simulations in the long-wavelength regime. Sound velocities of the dipole fluids and solids are derived and analyzed.

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“…The self-assembly of colloids is currently a topic of intensive research, both on fundamental [1][2][3][4][5][6][7][8][9][10][11] and applied aspects. [12][13][14][15][16][17][18][19][20][21][22] Amongst the self-assembly processes, the evaporation of colloidal droplets has attracted much interest due to its wide range of potential applications, extending from blood analysis [23][24][25][26] via inkjet printing, paint and polymers, [27][28][29] up to and including nanotechnology. [30] The main feature of colloidal droplets evaporation is the so-called coffee-ring effect.…”

Section: Introductionmentioning

confidence: 99%

Transitional bulk-solutal Marangoni instability in sessile drops

2018

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Evaporation of sessile droplets is a method to organize suspended particles on solid substrates. Many studies have demonstrated that Marangoni flows caused by surface adsorbed molecules or temperature gradients can strongly affect the dried deposit. In the present paper, we show how transitional Marangoni instabilitiy can be triggered by bulk-diluted tensio-active ions. Thanks to PIV analysis, we identify four different flow stages. The transition between them can be understood by considering the competition between the Marangoni flow and the mass conservation flow, usually responsible for the coffee-ring pattern. We also demonstrate that the initial ionic concentration can select a coffee-ring pattern or a more homogeneous dried deposit.

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Phase formation in colloidal systems with tunable interaction

Cited by 22 publications

References 23 publications

Mixed-order phase transition in a colloidal crystal

Mixed-order phase transition in a colloidal crystal

Thermodynamics and dynamics of two-dimensional systems with dipolelike repulsive interactions

Transitional bulk-solutal Marangoni instability in sessile drops

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