Focus

Colloidal matter

Model colloidal systems provide insight into aspects of the structure and dynamics of particulate systems on a broad range of length and time scales. In this focus issue, we highlight recent developments in colloidal self-assembly and colloidal phase transitions.

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Editorial

Assembling insight p1

doi:10.1038/nmat4191

Model colloidal systems are a testbed for understanding aspects of the organization of matter.


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Commentaries

Programmable self-assembly pp2–9

Ludovico Cademartiri & Kyle J. M. Bishop

doi:10.1038/nmat4184

Two conceptual strategies for encoding information into self-assembling building blocks highlight opportunities and challenges in the realization of programmable colloidal nanostructures.

Order through entropy pp9–12

Daan Frenkel

doi:10.1038/nmat4178

Understanding entropic contributions to common ordering transitions is essential for the design of self-assembling systems with addressable complexity.


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News and Views

Crystal–crystal transitions: Mediated by a liquid pp15–16

Eduardo Sanz & Chantal Valeriani

doi:10.1038/nmat4182

The nucleation of a crystal within another can involve intermediate liquid nuclei.

See also: Article by Peng et al.

Colloidal phase transitions: A switch for phase shifting pp17–18

Ah-Young Jee, Boyce Tsang & Steve Granick

doi:10.1038/nmat4179

Temperature can switch the thermodynamic phase of colloid–polymer mixtures by tipping the balance between competing attractive interactions induced by polymer depletion or adsorption.

See also: Letter by Feng et al.

Icosahedral quasicrystals: Assembled with one component pp18–19

Marc de Boissieu

doi:10.1038/nmat4183

Computer simulations of one-component three-dimensional icosahedral quasicrystals will help to understand the mechanisms that may stabilize them in experiments.

See also: Article by Engel et al.

Colloidal self-assembly: Reversible actuation pp19–20

Eric M. Furst

doi:10.1038/nmat4180

Janus ellipsoids self-assemble into self-limiting fibres that can be reversibly actuated by applying an electric field.

See also: Article by Shah et al.

Nanoparticle self-assembly: Enantioselective photoactivation pp21–22

Bart Kahr & Alexander G. Shtukenberg

doi:10.1038/nmat4174

Circularly polarized light actualizes the formation of chiral twisted ribbons from achiral semiconductor nanoparticles.

See also: Letter by Yeom et al.


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Letters

Entropy-driven formation of large icosahedral colloidal clusters by spherical confinement pp56–60

Bart de Nijs, Simone Dussi, Frank Smallenburg, Johannes D. Meeldijk, Dirk J. Groenendijk, Laura Filion, Arnout Imhof, Alfons van Blaaderen & Marjolein Dijkstra

doi:10.1038/nmat4072

Experiments with colloidal nano- and microparticles and computer simulations show that, unexpectedly, confinement and entropy are sufficient for the formation of icosahedral crystalline clusters of up to about 100,000 particles.

Re-entrant solidification in polymer–colloid mixtures as a consequence of competing entropic and enthalpic attractions pp61–65

Lang Feng, Bezia Laderman, Stefano Sacanna & Paul Chaikin

doi:10.1038/nmat4109

The competition between colloidal interactions resulting from polymer bridging and polymer exclusion in polymer–colloid dispersions leads to their solidification both on heating and on cooling.

See also: News and Views by Jee et al.

Chiral templating of self-assembling nanostructures by circularly polarized light pp66–72

Jihyeon Yeom, Bongjun Yeom, Henry Chan, Kyle W. Smith, Sergio Dominguez-Medina, Joong Hwan Bahng, Gongpu Zhao, Wei-Shun Chang, Sung-Jin Chang, Andrey Chuvilin, Dzmitry Melnikau, Andrey L. Rogach, Peijun Zhang, Stephan Link, Petr Kraál & Nicholas A. Kotov

doi:10.1038/nmat4125

Circularly polarized light produces enantiomeric excesses, above 30%, of twisted nanoribbons self-assembled from racemic dispersions of CdTe nanoparticles.

See also: News and Views by Kahr & Shtukenberg


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Articles

Two-step nucleation mechanism in solid–solid phase transitions pp101–108

Yi Peng, Feng Wang, Ziren Wang, Ahmed M. Alsayed, Zexin Zhang, Arjun G. Yodh & Yilong Han

doi:10.1038/nmat4083

Single-particle-resolution video microscopy of films of colloidal particles shows that solid–solid transitions between square and triangular lattices occur through a two-step nucleation mechanism that involves liquid nuclei.

See also: News and Views by Sanz & Valeriani

Computational self-assembly of a one-component icosahedral quasicrystal pp109–116

Michael Engel, Pablo F. Damasceno, Carolyn L. Phillips & Sharon C. Glotzer

doi:10.1038/nmat4152

A body-centred icosahedral quasicrystal has been assembled, by using molecular dynamics simulations, from a one-component fluid of particles interacting via a tunable, isotropic pair potential.

See also: News and Views by de Boissieu

Actuation of shape-memory colloidal fibres of Janus ellipsoids pp117–124

Aayush A. Shah, Benjamin Schultz, Wenjia Zhang, Sharon C. Glotzer & Michael J. Solomon

doi:10.1038/nmat4111

Experiments and computer simulations show that Janus ellipsoids can self-assemble into self-limiting fibres that have shape-memory properties and can be actuated by applying an external electric field.

See also: News and Views by Furst


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