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  1. Article

    Open Access

    Tunable templating of photonic microparticles via liquid crystal order-guided adsorption of amphiphilic polymers in emulsions

    Multiple emulsions are usually stabilized by amphiphilic molecules that combine the chemical characteristics of the different phases in contact. When one phase is a liquid crystal (LC), the choice of stabilize...

    Xu Ma, Yucen Han, Yan-Song Zhang, Yong Geng, Apala Majumdar in Nature Communications (2024)

  2. Article

    Open Access

    Robust cholesteric liquid crystal elastomer fibres for mechanochromic textiles

    Mechanically responsive textiles have transformative potential in many areas from fashion to healthcare. Cholesteric liquid crystal elastomers have strong mechanochromic responses that offer attractive opportu...

    Yong Geng, Rijeesh Kizhakidathazhath, Jan P. F. Lagerwall in Nature Materials (2022)

  3. Article

    Open Access

    Unclonable human-invisible machine vision markers leveraging the omnidirectional chiral Bragg diffraction of cholesteric spherical reflectors

    The seemingly simple step of molding a cholesteric liquid crystal into spherical shape, yielding a Cholesteric Spherical Reflector (CSR), has profound optical consequences that open a range of opportunities for p...

    Hakam Agha, Yong Geng, Xu Ma, Deniz Işınsu Avşar in Light: Science & Applications (2022)

  4. Article

    Open Access

    Interrogating helical nanorod self-assembly with fractionated cellulose nanocrystal suspensions

    The helical self-assembly of cholesteric liquid crystals is a powerful motif in nature, enabling exceptional performance in many biological composites. Attempts to mimic these remarkable materials by drying ch...

    Camila Honorato-Rios, Jan P. F. Lagerwall in Communications Materials (2020)

  5. Article

    Open Access

    Fractionation of cellulose nanocrystals: enhancing liquid crystal ordering without promoting gelation

    Colloids of electrically charged nanorods can spontaneously develop a fluid yet ordered liquid crystal phase, but this ordering competes with a tendency to form a gel of percolating rods. The threshold for ord...

    Camila Honorato-Rios, Claudius Lehr, Christina Schütz in NPG Asia Materials (2018)

  6. Article

    Open Access

    High-fidelity spherical cholesteric liquid crystal Bragg reflectors generating unclonable patterns for secure authentication

    Monodisperse cholesteric liquid crystal microspheres exhibit spherically symmetric Bragg reflection, generating, via photonic cross communication, dynamically tuneable multi-coloured patterns. These patterns, ...

    Yong Geng, JungHyun Noh, Irena Drevensek-Olenik, Romano Rupp in Scientific Reports (2016)

  7. Article

    Open Access

    Cellulose nanocrystal-based materials: from liquid crystal self-assembly and glass formation to multifunctional thin films

    Cellulose nanocrystals (CNCs), produced by the acid hydrolysis of wood, cotton or other cellulose-rich sources, constitute a renewable nanosized raw material with a broad range of envisaged uses: for example, ...

    Jan P F Lagerwall, Christina Schütz, Michaela Salajkova, JungHyun Noh in NPG Asia Materials (2014)