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Start Over Author "Dijkstra, M" Publisher american physical society
188 results on '"Dijkstra, M"'

1. Coulombic Surface-Ion Interactions Induce Nonlinear and Chemistry-Specific Charging Kinetics

Author

Sub Cond-Matter Theory, Stat & Comp Phys, Sub Soft Condensed Matter, Soft Condensed Matter and Biophysics, Theoretical Physics, Boon, W. Q., Dijkstra, M., Van Roij, R., Sub Cond-Matter Theory, Stat & Comp Phys, Sub Soft Condensed Matter, Soft Condensed Matter and Biophysics, Theoretical Physics, Boon, W. Q., Dijkstra, M., and Van Roij, R.

Published
2023

5. Phase diagram of hard asymmetric dumbbell particles

Author

Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Afd Soft Condensed Matter and Biophysics, Milinkovic, K., Dennison, M, Dijkstra, M., Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Afd Soft Condensed Matter and Biophysics, Milinkovic, K., Dennison, M, and Dijkstra, M.

Published
2013

6. Phase Diagram and Structural Diversity of a Family of Truncated Cubes: Degenerate Close-Packed Structures and Vacancy-Rich States

Author

Soft Condensed Matter and Biophysics, Theoretical Physics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, Gantapara, A.P., de Graaf, J., van Roij, R.H.H.G., Dijkstra, M., Soft Condensed Matter and Biophysics, Theoretical Physics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, Gantapara, A.P., de Graaf, J., van Roij, R.H.H.G., and Dijkstra, M.

Published
2013

7. Orientational order of carbon nanotube guests in a nematic host suspension of colloidal viral rods

Author

Soft Condensed Matter and Biophysics, Theoretical Physics, Afd Soft Condensed Matter and Biophysics, Afd Theoretical Physics (ITF), Sub Soft Condensed Matter, Puech, N., Dennison, M, Blanc, C, van der Schoot, P. P. A. M., Dijkstra, M., Van Roij, R., Poulin, P., Grelet, E, Soft Condensed Matter and Biophysics, Theoretical Physics, Afd Soft Condensed Matter and Biophysics, Afd Theoretical Physics (ITF), Sub Soft Condensed Matter, Puech, N., Dennison, M, Blanc, C, van der Schoot, P. P. A. M., Dijkstra, M., Van Roij, R., Poulin, P., and Grelet, E

Published
2012

9. Phase Diagram and Effective Shape of Semiflexible Colloidal Rods and Biopolymers

Author

Soft Condensed Matter and Biophysics, Theoretical Physics, Afd Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, Dennison, M|info:eu-repo/dai/nl/339588349, Dijkstra, M.|info:eu-repo/dai/nl/123538807, van Roij, R.H.H.G.|info:eu-repo/dai/nl/152978984, Soft Condensed Matter and Biophysics, Theoretical Physics, Afd Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, Dennison, M|info:eu-repo/dai/nl/339588349, Dijkstra, M.|info:eu-repo/dai/nl/123538807, and van Roij, R.H.H.G.|info:eu-repo/dai/nl/152978984

Published
2011

10. Polydispersity Stabilizes Biaxial Nematic Liquid Crystals

Author

Soft Condensed Matter and Biophysics, Theoretical Physics, Afd Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, Belli, S, patti, A, Dijkstra, M., van Roij, R.H.H.G., Soft Condensed Matter and Biophysics, Theoretical Physics, Afd Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, Belli, S, patti, A, Dijkstra, M., and van Roij, R.H.H.G.

Published
2011

13. Non-Gaussian dynamics in smectic liquid crystals of parallel hard rods

Author

Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Afd Soft Condensed Matter and Biophysics, Matena, R., Dijkstra, M., patti, A, Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Afd Soft Condensed Matter and Biophysics, Matena, R., Dijkstra, M., and patti, A

Published
2010

14. Effective shape and phase behavior of short charged rods

Author

Soft Condensed Matter and Biophysics, Theoretical Physics, Sub Cond-Matter Theory, Stat & Comp Phys, Sub Soft Condensed Matter, Eggen, E.J., Dijkstra, M., van Roij, R.H.H.G., Soft Condensed Matter and Biophysics, Theoretical Physics, Sub Cond-Matter Theory, Stat & Comp Phys, Sub Soft Condensed Matter, Eggen, E.J., Dijkstra, M., and van Roij, R.H.H.G.

Published
2009

15. Stringlike clusters and cooperative interlayer permeation in smectic liquid crystals formed by colloidal rods

Author

Soft Condensed Matter and Biophysics, Theoretical Physics, Afd Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, patti, A, al Masri, J.H.M., van Roij, R.H.H.G., Dijkstra, M., Soft Condensed Matter and Biophysics, Theoretical Physics, Afd Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, patti, A, al Masri, J.H.M., van Roij, R.H.H.G., and Dijkstra, M.

Published
2009

16. Triangular tessellation scheme for the adsorption free energy at the liquid-liquid interface : towards nonconvex patterned colloids

Author

Soft Condensed Matter and Biophysics, Theoretical Physics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, de Graaf, J., Dijkstra, M., van Roij, R.H.H.G., Soft Condensed Matter and Biophysics, Theoretical Physics, Sub Soft Condensed Matter, Sub Cond-Matter Theory, Stat & Comp Phys, de Graaf, J., Dijkstra, M., and van Roij, R.H.H.G.

Published
2009

18. Self diffusion of particles in complex fluids : temporary cages and permanent barriers

Author

Condensed Matter Theory, Statistical and Computational Physics, Dep Natuurkunde, Bier, Markus, van Roij, R.H.H.G.|info:eu-repo/dai/nl/152978984, Dijkstra, M.|info:eu-repo/dai/nl/123538807, van der Schoot, P., Condensed Matter Theory, Statistical and Computational Physics, Dep Natuurkunde, Bier, Markus, van Roij, R.H.H.G.|info:eu-repo/dai/nl/152978984, Dijkstra, M.|info:eu-repo/dai/nl/123538807, and van der Schoot, P.

Published
2008

21. Isotropic-nematic interface and wetting in suspensions of colloidal platelets

Author

Colloïden en grenslagen, Dep Scheikunde, Dep Natuurkunde, van der Beek, D., Reich, H., van der Schoot, P., Dijkstra, M., Schilling, T., Vink, R., Schmidt, M., van Roij, R.H.H.G., Lekkerkerker, H.N.W., Colloïden en grenslagen, Dep Scheikunde, Dep Natuurkunde, van der Beek, D., Reich, H., van der Schoot, P., Dijkstra, M., Schilling, T., Vink, R., Schmidt, M., van Roij, R.H.H.G., and Lekkerkerker, H.N.W.

Published
2006

24. Phase behaviour of dipolar hard and soft spheres

Author

Soft Condensed Matter and Biophysics, Universiteit Utrecht, Dep Natuurkunde, Hynninen, a.-p, Dijkstra, M., Soft Condensed Matter and Biophysics, Universiteit Utrecht, Dep Natuurkunde, Hynninen, a.-p, and Dijkstra, M.

Published
2005

29. Floating liquid phase in sedimenting colloid-polymer mixtures

Author

Soft Condensed Matter and Biophysics, Universiteit Utrecht, Dep Natuurkunde, Schmidt, M., Dijkstra, M., Hansen, J.-P, Soft Condensed Matter and Biophysics, Universiteit Utrecht, Dep Natuurkunde, Schmidt, M., Dijkstra, M., and Hansen, J.-P

Published
2004

30. Frustration of the Isotropic-Columnar Phase Transition of Colloidal Hard Platelets by a Transient Cubatic Phase

Author

Marechal, M.A.T., patti, A, Dennison, M, Dijkstra, M., Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Afd Soft Condensed Matter and Biophysics, Soft Condensed Matter and Biophysics, Sub Soft Condensed Matter, Afd Soft Condensed Matter and Biophysics, Physics of Living Systems, and LaserLaB - Molecular Biophysics

Subjects
Materials science, Condensed matter physics, media_common.quotation_subject, Isotropy, General Physics and Astronomy, Frustration, FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, Condensed Matter::Soft Condensed Matter, Colloid, Devitrification, Phase (matter), Metastability, Particle, Soft Condensed Matter (cond-mat.soft), Columnar phase, media_common
Abstract

Using simulations and theory, we show that the cubatic phase is metastable for three model hard platelets. The locally favored structures of perpendicular particle stacks in the fluid prevent the formation of the columnar phase through geometric frustration resulting in vitrification. Also, we find a direct link between structure and dynamic heterogeneities in the cooperative rotation of particle stacks, which is crucial for the devitrification process. Finally, we show that the life time of the glassy cubatic phase can be tuned by surprisingly small differences in particle shape., Comment: Submitted to Phys. Rev. Lett

Published
2012

33. Three-body forces between charged colloidal particles

Author

Soft Condensed Matter and Biophysics, Universiteit Utrecht, Dep Natuurkunde, Russ, C., von Grunberg, H., Dijkstra, M., van Roij, R.H.H.G., Soft Condensed Matter and Biophysics, Universiteit Utrecht, Dep Natuurkunde, Russ, C., von Grunberg, H., Dijkstra, M., and van Roij, R.H.H.G.

Published
2002

37. Phase diagram of charge-stabilized colloidal suspensions: van der Waals instability without attractive forces

Author

Sub Cond-Matter Theory, Stat & Comp Phys, Sub Soft Condensed Matter, Sub Gen. Pharmacoepi and Clinical Pharm, Theoretical Physics, Soft Condensed Matter and Biophysics, van Roij, R, Dijkstra, M, Hansen, JP, Sub Cond-Matter Theory, Stat & Comp Phys, Sub Soft Condensed Matter, Sub Gen. Pharmacoepi and Clinical Pharm, Theoretical Physics, Soft Condensed Matter and Biophysics, van Roij, R, Dijkstra, M, and Hansen, JP

Published
1999

38. Phase diagram of highly asymmetric binary hardsphere mixtures

Author

Condensed Matter Theory, Statistical and Computational Physics, Universiteit Utrecht, Dep Natuurkunde, Dijkstra, M., van Roij, R.H.H.G., Evans, R., Condensed Matter Theory, Statistical and Computational Physics, Universiteit Utrecht, Dep Natuurkunde, Dijkstra, M., van Roij, R.H.H.G., and Evans, R.

Published
1999

39. Density functional theory for chiral nematic liquid crystals.

Author

Belli, S., Dussi, S., Dijkstra, M., and Roij, R. van

Subjects
*THERMODYNAMICS, *NEMATIC liquid crystals, *CHOLESTERIC liquid crystals, *CHIRALITY of nuclear particles, *QUANTUM entropy
Abstract

Even though chiral nematic phases were the first liquid crystals experimentally observed more than a century ago, the origin of the thermodynamic stability of cholesteric states is still unclear. In this Rapid Communication we address the problem by means of a density functional theory for the equilibrium pitch of chiral particles. When applied to right-handed hard helices, our theory predicts an entropy-driven cholesteric phase, which can be either right or left handed, depending not only on the particle shape but also on the thermodynamic state. We explain the origin of the chiral ordering as an interplay between local nematic alignment and excluded-volume differences between left- and right-handed particle pairs. [ABSTRACT FROM AUTHOR]

Published
2014
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40. Polydispersity Stabilizes Biaxial Nematic Liquid Crystals.

Author

Belli, S., Patti, A., Dijkstra, M., and van Roij, R.

Subjects
*NEMATIC liquid crystals, *THERMOTROPISM, *PHASE diagrams, *TRANSPORT theory, *LANDAU levels
Abstract

Inspired by the observations of a remarkably stable biaxial nematic phase [van den Pol et al., Phys. Rev. Lett. 103, 258301 (2009)], we investigate the effect of size polydispersity on the phase behavior of a suspension of boardlike particles. By means of Onsager theory within the restricted orientation (Zwanzig) model we show that polydispersity induces a novel topology in the phase diagram, with two Landau tetracritical points in between which oblate uniaxial nematic order is favored over the expected prolate order. Additionally, this phenomenon causes the opening of a huge stable biaxiality regime in between uniaxial nematic and smectic states. [ABSTRACT FROM AUTHOR]

Published
2011
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41. Revealing a Vacancy Analog of the Crowdion Interstitial in Simple Cubic Crystals.

Author

van der Meer, B., van Damme, R., Dijkstra, M., Smallenburg, F., and Filion, L.

Subjects
*VACANCIES in crystals, *CROWDIONS (Crystallography), *INTERSTITIAL defects
Abstract

Vacancies in simple cubic crystals of hard cubes are known to delocalize over one-dimensional chains of several lattice sites. Here, we use computer simulations to examine the structure and dynamics of vacancies in simple cubic crystals formed by hard cubes, right rhombic prisms (slanted cubes), truncated cubes, and particles interacting via a soft isotropic pair potential. We show that these vacancies form a vacancy analog of the crowdion interstitial, generating a strain field which follows a soliton solution of the sine-Gordon equation, and diffusing via a persistent random walk. Surprisingly, we find that the structure of these "voidions" is not significantly affected by changes in density, vacancy concentration, and even particle interaction. We explain this structure quantitatively using a one-dimensional model that includes the free-energy barrier particles have to overcome to slide between lattice sites and the effective pair interaction along this line. We argue that voidions are a robust phenomenon in systems of repulsive particles forming simple cubic crystals. [ABSTRACT FROM AUTHOR]

Published
2018
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42. Depth dependence of vacancy formation energy at (100), (110), and (111) Al surfaces: A first-principles study.

Author

Gupta, S. S., van Huis, M. A., Dijkstra, M., and Sluiter, M. H. F.

Subjects
*ALUMINUM compounds, *SEMICONDUCTOR nanoparticles, *CRYSTALLOGRAPHIC shear
Abstract

Vacancy defects are known to play an important role in the structural and chemical properties of metallic and semiconductor nanoparticles. Here, we investigate the likelihood of vacancy formation at the surface, in the subsurfaces, and in the interior of a model system of Al nanocrystals. The depth dependence of the vacancy formation energy (VFE) in 14-17 layered low-indexed surfaces of aluminium is studied using LDA, PBE, and PBEsol exchange-correlation functionals. Within a depth of two subsurface layers, the functionals make a transition from a similar description of surfaces to the differences in VFEs observed in bulk Al. The VFE converges to the bulk value within 0.01 eV beyond a maximum depth of 3-6 atomic layers, depending on the crystallographic surface plane. We find that the different convergence behaviors are related to the relaxations of atomic planes, normal to the surface, which in turn depend on the packing density of these surfaces. For the (111) subsurfaces, surprisingly, the defect formation energies are found to be higher than that of bulk Al, which is related to the hindered relaxations in its close-packed atomic planes. Although our results predict considerably lower VFE for the topmost layers of all the surfaces, the likelihood of forming a vacancy in the immediate subsurfaces of multifaceted Al nanoparticles is predicted to be lower than in bulk Al, which is in contrast to expectation. [ABSTRACT FROM AUTHOR]

Published
2016
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43. Self-Assembly of a Colloidal Interstitial Solid with Tunable Sublattice Doping.

Author

Filion, L., Hermes, M., Ni, R., Vermolen, E. C. M., Kuijk, A., Christova, C. G., Stiefelhagen, J. C. P., Vissers, T., Van Blaaderen, A., and Dijkstra, M.

Subjects
*PHASE diagrams, *GIBBS' free energy, *MONTE Carlo method, *STOICHIOMETRY, *CRYSTALS
Abstract

We determine the phase diagram of a binary mixture of small and large hard spheres with a size ratio of 0.3 using free-energy calculations in Monte Carlo simulations. We find a stable binary fluid phase, a pure face-centered-cubic (fcc) crystal phase of the small spheres, and binary crystal structures with LS and LS6 stoichiometries. Surprisingly, we demonstrate theoretically and experimentally the stability of a novel interstitial solid solution in binary hard-sphere mixtures, which is constructed by filling the octahedral holes of an fcc crystal of large spheres with small spheres. We find that the fraction of octahedral holes filled with a small sphere can be completely tuned from 0 to 1. Additionally, we study the hopping of the small spheres between neighboring octahedral holes, and interestingly, we find that the diffusion increases upon increasing the density of small spheres. [ABSTRACT FROM AUTHOR]

Published
2011
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44. Coulombic Surface-Ion Interactions Induce Nonlinear and Chemistry-Specific Charging Kinetics.

Author

Boon WQ, Dijkstra M, and van Roij R

Abstract

While important for many industrial applications, chemical reactions responsible for the charging of solids in water are often poorly understood. We theoretically investigate the charging kinetics of solid-liquid interfaces and find that the time-dependent equilibration of surface charge contains key information not only on the reaction mechanism, but also on the valency of the reacting ions. We construct a nonlinear differential equation describing surface charging by combining chemical Langmuir kinetics and electrostatic Poisson-Boltzmann theory. Our results reveal a clear distinction between late-time (near-equilibrium) and short-time (far-from-equilibrium) relaxation rates, the ratio of which contains information on the charge valency and ad- or desorption mechanism of the charging process. Similarly, we find that single-ion reactions can be distinguished from two-ion reactions, as the latter show an inflection point during equilibration. Interestingly, such inflection points are characteristic of autocatalytic reactions, and we conclude that the Coulombic ion-surface interaction is an autocatalytic feedback mechanism.

Published
2023
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45. Machine Learning of Implicit Combinatorial Rules in Mechanical Metamaterials.

Author

van Mastrigt R, Dijkstra M, van Hecke M, and Coulais C

Subjects
Machine Learning, Neural Networks, Computer
Abstract

Combinatorial problems arising in puzzles, origami, and (meta)material design have rare sets of solutions, which define complex and sharply delineated boundaries in configuration space. These boundaries are difficult to capture with conventional statistical and numerical methods. Here we show that convolutional neural networks can learn to recognize these boundaries for combinatorial mechanical metamaterials, down to finest detail, despite using heavily undersampled training sets, and can successfully generalize. This suggests that the network infers the underlying combinatorial rules from the sparse training set, opening up new possibilities for complex design of (meta)materials.

Published
2022
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46. Kinetic Phase Diagram for Nucleation and Growth of Competing Crystal Polymorphs in Charged Colloids.

Author

Gispen W and Dijkstra M

Abstract

We determine the kinetic phase diagram for nucleation and growth of crystal phases in a suspension of charged colloids. Exploiting the seeding approach in extensive simulations, we calculate nucleation barrier heights for face-centered cubic (fcc) and body-centered cubic (bcc) phases for varying screening lengths and supersaturations. We determine for the entire metastable fluid region the crystal polymorph with the lowest nucleation barrier, and find a regime close to the triple point where metastable bcc can form due to a lower nucleation barrier, even though fcc is the stable phase. For higher supersaturation, we find that the difference in barrier heights decreases and we observe a mix of hexagonal close-packed, fcc, and bcc structures in the growth of crystalline seeds as well as in spontaneously formed crystals. Our kinetic phase diagram rationalizes the different crystallization mechanisms observed in previous work.

Published
2022
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47. Coupling between splay deformations and density modulations in splay-bend phases of bent colloidal rods.

Author

Anzivino C, van Roij R, and Dijkstra M

Abstract

Using a grand-canonical Landau-de Gennes theory for colloidal suspensions of bent (banana-shaped) rods, we investigate how spatial deformations in the nematic director field affect the local density of twist-bend and splay-bend nematic phases. The grand-canonical character of the theory naturally relates the local density to the local nematic order parameter S. In the splay-bend phase, we find S and hence the local density to modulate periodically along one spatial direction. As a consequence the splay-bend phase has the key symmetries of a smectic rather than a nematic phase. By contrast we find that S and hence the local density do not vary in space in the twist-bend phase, which is therefore a proper nematic phase. The theoretically predicted one-dimensional density modulations in splay-bend phases are in agreement with recent simulations.

Published
2022
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48. Nonconventional Phases of Colloidal Nanorods with a Soft Corona.

Author

Campos-Villalobos G, Dijkstra M, and Patti A

Abstract

Using computer simulations, we investigate the phase behavior of hard-core spherocylinders with a length-to-diameter ratio L/σ=5 and coated by a soft deformable corona of length λ/σ=1.35. When quasi-two-dimensional layers are formed in smectic and solid phases at low temperatures, the competition between the two intrinsic length scales of the parallel aligned particles leads to the stabilization of different in-plane lattices of nonconventional symmetry, including low-density hexagonal, square, and high-density hexagonal crystals, as well as an intriguing dodecagonal quasicrystal. Our Letter opens up the opportunity to control the assembly of anisotropic nanoparticles into structures with preengineered symmetry-dependent physical properties.

Published
2021
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49. Helicoidal dynamics of biaxial curved rods in twist-bend nematic phases unveiled by unsupervised machine learning techniques.

Author

Chiappini M, Patti A, and Dijkstra M

Abstract

Uniaxial rods in a nematic phase diffuse preferentially in the direction parallel to the nematic director n[over ̂]. The nematic director field n[over ̂](r) of a chiral twist-bend nematic (N_{TB}) phase of achiral banana-shaped particles, recently discovered experimentally, displays a heliconical twist of given handedness and periodicity. Using simulations, we investigate the long-time macroscopic diffusion in N_{TB} phases, and find that the predilection of curved rods to diffuse in the direction of the twisting n[over ̂](r) yields a fascinating chiral dynamics along helices, even though achiral curved rods display Brownian motion with a nontrivial rototranslational coupling. We devise a machine learning protocol to characterize the helicoidal particle trajectories, finding that their pitch and radius are determined by the pitch and conical angle of the N_{TB} phase thereby connecting its structural and dynamical properties.

Published
2020
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50. Speeding up Dynamics by Tuning the Noncommensurate Size of Rodlike Particles in a Smectic Phase.

Author

Chiappini M, Grelet E, and Dijkstra M

Abstract

Using simulations, we study the diffusion of rodlike guest particles in a smectic environment of rodlike host particles. We find that the dynamics of guest rods across smectic layers changes from a fast nematiclike diffusion to a slow hopping-type dynamics via an intermediate switching regime by varying the length of the guest rods with respect to the smectic layer spacing. We determine the optimal rod length that yields the fastest and the slowest diffusion in a lamellar environment. We show that this behavior can be rationalized by a complex 1D effective periodic potential exhibiting two energy barriers, resulting in a varying preferred mean position of the guest particle in the smectic layer. The interplay of these two barriers controls the dynamics of the guest particles yielding a slow, an intermediate, and a fast diffusion regime depending on the particle length.

Published
2020
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