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Showing 1–8 of 8 results
Advanced filters: Author: Jan Lagerwall Clear advanced filters

  • Fractionating nanorod suspensions by aspect ratio strongly affects liquid crystal formation without affecting gelation, in contrast to expectations from the classic percolation-based model. Gelation is rather triggered by increasing the counterion concentration until the CNCs lose colloidal stability. As a consequence, we significantly extend the regime where we can study equilibrium liquid crystal behavior without risking arrest into a gel state.

    • Camila Honorato-Rios
    • Claudius Lehr
    • Jan P. F. Lagerwall
    ResearchOpen Access
    NPG Asia Materials
    Volume: 10, P: 455-465

  • The role of polymers in stabilizing liquid crystal (LC)-water interfaces is well studied but how the LC affects stabilizers is not fully explored yet. Here, Ma et al. show that amphiphilic polymers change their behavior when the LC is heated towards its transition to the isotropic state, and propose that this is due to an entropic repulsion active at low temperatures where the orientationally ordered LC restricts the mobility of the flexible polymer chains.

    • Xu Ma
    • Yucen Han
    • Jan P. F. Lagerwall
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-15

  • The chiral liquid crystalline self-organization of cellulose nanocrystals into helical arrangements, giving the resulting materials photonic crystal properties and enhanced mechanical behavior, are comprehensively summarized and compared with other rod-like nanoparticles, for example, carbon nanotubes and fd virus. The consequences of the sensitive balance between liquid crystal formation and glass/gel formation are discussed in detail, in particular regarding the development toward control of helix pitch and orientation. Important topics for future studies are identified and suggestions for novel applications are made.

    • Jan P F Lagerwall
    • Christina Schütz
    • Lennart Bergström
    ReviewsOpen Access
    NPG Asia Materials
    Volume: 6, P: e80

  • Liquid crystal elastomers can perform mechanical motion triggered by external stimuli, and are light weight, flexible materials that may be integrated into micromechanical systems. Here they are used to fabricate a one-piece temperature-responsive micropump viaa microfluidic double-emulsion process.

    • Eva-Kristina Fleischmann
    • Hsin-Ling Liang
    • Rudolf Zentel
    Research
    Nature Communications
    Volume: 3, P: 1-8

  • Aligning cholesteric liquid crystal nanorods is key to their optical properties, yet challenging to achieve in artificial systems. Here cellulose nanorods are fractionated from suspension, revealing that nanorod length correlates with helical twist, allowing uniformly violet films to be created.

    • Camila Honorato-Rios
    • Jan P. F. Lagerwall
    ResearchOpen Access
    Communications Materials
    Volume: 1, P: 1-11

  • Cholesteric Spherical Reflectors (CSRs) are omnidirectional retroreflectors that are selective in circular polarization and wavelength, enabling human-invisible fiducial markers for applications in robotics, augmented reality, anti-counterfeiting, circular economy and more

    • Hakam Agha
    • Yong Geng
    • Jan P. F. Lagerwall
    ReviewsOpen Access
    Light: Science & Applications
    Volume: 11, P: 1-19