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Showing 1–9 of 9 results
Advanced filters: Author: Alberto Fernandez-Nieves Clear advanced filters

  • Chirality in molecular materials is commonly used to manipulate the polarization of light. Here, Nayani et al. observe the formation of doubly twisted structure in achiral chromonic liquid crystals when confined to a cylindrical capillary, which leads to spontaneous chiral breaking.

    • Karthik Nayani
    • Rui Chang
    • Mohan Srinivasarao
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-7

  • A material’s internal structure is known to dictate its macroscopic properties through structure-dependent particle dynamics, as exemplified by the so-called de Gennes narrowing. Through experiments and simulations on soft colloid suspensions, the authors reveal a breakdown of this correlation, showing that the q-dependent relaxation time remains unchanged across length scales and that single-particle elasticity facilitates structure-independent relaxation.

    • Adrián Arenas-Gullo
    • Joaquím Clara-Rahola
    • Alberto Fernandez-Nieves
    ResearchOpen Access
    Nature Communications
    Volume: 17, P: 1-9

  • Glasses can be divided into fragile or strong, depending on whether they show a marked dependence of their relaxation time with temperature when approaching the glass transition. Although colloidal particles have previously been found to produce only fragile glasses, here it is shown that deformable colloidal particles exhibit the same variation in fragility as that observed in molecular liquids. Colloids are easy to study, so this model should provide new insight into glass formation in molecular systems.

    • Johan Mattsson
    • Hans M. Wyss
    • David A. Weitz
    Research
    Nature
    Volume: 462, P: 83-86

  • Some active matter systems as they evolve, can be characterized by spatially varying density, with some regions that are dense and immobile, and other regions with lower density that accommodate most mobile particles. The authors show that this phenomenon can also be observed as an effect of the social interactions between fire ants.

    • Caleb Anderson
    • Alberto Fernandez-Nieves
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-10

  • The existence of peripheric charged groups on poly-N-isopropylacrylamide (pNIPAM) microgels together with the corresponding counter ion clouds has been proposed to be responsible for the spontaneous deswelling of pNIPAM microgels in concentrated suspensions but no direct measurement of such an ionic cloud exists. Here, the authors use small-angle neutron scattering with contrast variation with different ions to isolate the change in the form factor directly related to the counterion cloud and obtain its radius and width.

    • Boyang Zhou
    • Urs Gasser
    • Alberto Fernandez-Nieves
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-7

  • Topological defects in a turbulent active nematic on a toroidal surface are shown to segregate in regions of opposite curvature. Simulations suggest that this behaviour may be controlled — or even suppressed — by tuning the level of activity.

    • Perry W. Ellis
    • Daniel J. G. Pearce
    • Alberto Fernandez-Nieves
    Research
    Nature Physics
    Volume: 14, P: 85-90

  • Coating a spherical colloid with a nematic liquid crystal causes frustration-induced defects in the crystal. The thickness of this coating can be used to systematically control the number and orientation of these defects, which could be useful for engineering the microstructure of colloidal materials.

    • T. Lopez-Leon
    • V. Koning
    • A. Fernandez-Nieves
    Research
    Nature Physics
    Volume: 7, P: 391-394

  • Aggregations of fire ants are viscoelastic with identical elastic and viscous moduli, and exhibit shear-thinning behaviour when deformed beyond the linear regime.

    • Michael Tennenbaum
    • Zhongyang Liu
    • Alberto Fernandez-Nieves
    Research
    Nature Materials
    Volume: 15, P: 54-59

  • A high-throughput hydrogel-based platelet-contraction cytometer is able to quantify single-platelet contraction forces and may function as a clinical diagnostic biophysical biomarker.

    • David R. Myers
    • Yongzhi Qiu
    • Wilbur A. Lam
    Research
    Nature Materials
    Volume: 16, P: 230-235