Bipolar to toroidal configuration transition in liquid crystal droplets

References

• Senyuk B, Liu Q, He S, et al. Topological colloids. Nature. 2013;493:200–205.
   PubMed Web of Science ®Google Scholar
• Poulin P, Stark H, Lubensky T, et al. Novel colloidal interactions in anisotropic fluids. Science. 1997;275:1770–1773.
   PubMed Web of Science ®Google Scholar
• Yoshioka J, Ito F, Tabe Y. Stability of a double twisted structure in spherical cholesteric droplets. Soft Matter. 2016;12:2400–2407.
   PubMed Web of Science ®Google Scholar
• Lavrentovich O. Topological defects in dispersed words and worlds around liquid crystals, or liquid crystal drops. Liq Cryst. 1998;24:117–126.
   Web of Science ®Google Scholar
• Jeong J, Davidson ZS, Collings PJ, et al. Chiral symmetry breaking and surface faceting in chromonic liquid crystal droplets with giant elastic anisotropy. Proc Natl Acad Sci. 2014;111:1742–1747.
   Google Scholar
• Erdmann JH, Žumer S, Doane JW. Configuration transition in a nematic liquid crystal confined to a small spherical cavity. Phys Rev Lett. 1990;64:1907.
   PubMed Web of Science ®Google Scholar
• Peng C, Lavrentovich OD. Chirality amplification and detection by tactoids of lyotropic chromonic liquid crystals. Soft Matter. 2015;11:7257–7263.
   PubMed Web of Science ®Google Scholar
• Gupta JK, Sivakumar S, Caruso F, et al. Size-dependent ordering of liquid crystals observed in polymeric capsules with micrometer and smaller diameters. Angew Chem Int Ed. 2009;48:1652–1655.
   PubMed Web of Science ®Google Scholar
• Ondris-Crawford R, Boyko EP, Wagner BG, et al. Microscope textures of nematic droplets in polymer dispersed liquid crystals. J Appl Phys. 1991;69:6380–6386.
   Web of Science ®Google Scholar
• Doane J, Golemme A, West JL, et al. Polymer dispersed liquid crystals for display application. Mol Cryst Liq Cryst. 1988;165:511–532.
   Web of Science ®Google Scholar
• Xu F, Kitzerow H-S, Crooker P. Director configurations of nematic-liquid-crystal droplets: negative dielectric anisotropy and parallel surface anchoring. Phys Rev E. 1994;49:3061–3068.
   Web of Science ®Google Scholar
• Jiang J, McGraw G, Ma R, et al. Selective scattering polymer dispersed liquid crystal film for light enhancement of organic light emitting diode. Opt Express. 2017;25:3327–3335.
   PubMed Web of Science ®Google Scholar
• Yang D-K, Wu S-T. Fundamentals of liquid crystal devices. West Sussex: Wiley; 2014. doi:10.1002/9781118751992
   Google Scholar
• Park W-S, Choi K-S. Improvement in the electro-optical properties of polymer dispersed liquid crystals. J Korean Phys Soc. 1999;34:231–236.
   Web of Science ®Google Scholar
• Park N-H, Park S-I, Suh K-D. A novel method for encapsulation of a liquid crystal in monodisperse micron-sized polymer particles. Colloid Polym Sci. 2001;279:1082–1089.
   Web of Science ®Google Scholar
• Drzaic PS. Polymer dispersed nematic liquid crystal for large area displays and light valves. J Appl Phys. 1986;60:2142–2148.
   Web of Science ®Google Scholar
• Crawford GP, Zumer S. Liquid crystals in complex geometries: formed by polymer and porous networks. London: Taylor & Francis; 1996.
   Google Scholar
• Ren H, Fan Y-H, Wu S-T. Tunable Fresnel lens using nanoscale polymer-dispersed liquid crystals. Appl Phys Lett. 2003;83:1515–1517.
   Web of Science ®Google Scholar
• Bunning TJ, Natarajan LV, Tondiglia VP, et al. Holographic polymer-dispersed liquid crystals (H-PDLCs) 1. Annu Rev Mater Sci. 2000;30:83–115.
   Web of Science ®Google Scholar
• Yang DK, Chien LC, Doane J. Cholesteric liquid crystal/polymer dispersion for haze-free light shutters. Appl Phys Lett. 1992;60:3102–3104.
   Web of Science ®Google Scholar
• Malik P, Raina K. Droplet orientation and optical properties of polymer dispersed liquid crystal composite films. Opt Mater. 2004;27:613–617.
   Web of Science ®Google Scholar
• Yang D-K, Lu Z, Doane JW Bistable polymer dispersed cholesteric liquid crystal displays. Google Patents; 2000.
   Google Scholar
• Ding J, Yang Y. Birefringence patterns of nematic droplets. Jpn J Appl Phys. 1992;31:2837.
   Web of Science ®Google Scholar
• Xu F, Crooker P. Chiral nematic droplets with parallel surface anchoring. Phys Rev E. 1997;56:6853.
   Web of Science ®Google Scholar
• Drzaic PS. A case of mistaken identity: spontaneous formation of twisted bipolar droplets from achiral nematic materials. Liq Cryst. 1999;26:623–627.
   Web of Science ®Google Scholar
• Fernández-Nieves A, Link D, Marquez M, et al. Topological changes in bipolar nematic droplets under flow. Phys Rev Lett. 2007;98:087801.
   PubMed Web of Science ®Google Scholar
• Tortora L, Lavrentovich OD. Chiral symmetry breaking by spatial confinement in tactoidal droplets of lyotropic chromonic liquid crystals. Proc Natl Acad Sci. 2011;108:5163–5168.
   Google Scholar
• Springer GH, Higgins DA. Toroidal droplet formation in polymer-dispersed liquid crystal films. J Am Chem Soc. 2000;122:6801–6802.
   Web of Science ®Google Scholar
• Chiccoli C, Pasini P, Semeria F, et al. Computer simulations of nematic droplets with toroidal boundary conditions. Mol Cryst Liq Cryst. 1992;221:19–28.
   Web of Science ®Google Scholar
• Williams R. Two transitions in tangentially anchored nematic droplets. J Phys A Math Gen. 1986;19:3211.
   Google Scholar
• Chen D, Porada JH, Hooper JB, et al. Chiral heliconical ground state of nanoscale pitch in a nematic liquid crystal of achiral molecular dimers. Proc Natl Acad Sci. 2013;110:15931–15936.
   Google Scholar
• Coles HJ, Pivnenko MN. Liquid crystal ‘blue phases’ with a wide temperature range. Nature. 2005;436:997–1000.
   PubMed Web of Science ®Google Scholar
• Meyer C, Luckhurst G, Dozov I. Flexoelectrically driven electroclinic effect in the twist-bend nematic phase of achiral molecules with bent shapes. Phys Rev Lett. 2013;111:067801.
   PubMed Web of Science ®Google Scholar
• Xiang J, Li Y, Li Q, et al. Electrically tunable selective reflection of light from ultraviolet to visible and infrared by heliconical cholesterics. Adv Mater. 2015;27:3014–3018.
   PubMed Web of Science ®Google Scholar
• Barnes P, Douglass A, Heeks S, et al. An enhanced odd-even effect of liquid crystal dimers orientational order in the α, ω-bis (4′-cyanobiphenyl-4-yl) alkanes. Liq Cryst. 1993;13:603–613.
   Web of Science ®Google Scholar
• Borshch V, Kim Y-K, Xiang J, et al. Nematic twist-bend phase with nanoscale modulation of molecular orientation. Nat Commun. 2013;4.
   PubMed Web of Science ®Google Scholar
• Jokisaari JP, Luckhurst GR, Timimi BA, et al. Twist-bend nematic phase of the liquid crystal dimer CB7CB: orientational order and conical angle determined by 129Xe and 2H NMR spectroscopy. Liq Cryst. 2015;42:708–721.
   Web of Science ®Google Scholar
• Yu M, Zhou X, Jiang J, et al. Matched elastic constants for a perfect helical planar state and a fast switching time in chiral nematic liquid crystals. Soft Matter. 2016;12:4483–4488.
   PubMed Web of Science ®Google Scholar
• Yeh P, Gu C. Optics of liquid crystal displays. New York (NY): Wiley; 2010.
   Google Scholar
• Uchida T, Takahashi Y. New method to determine elastic constants of nematic liquid crystal from CV curve. Mol Cryst Liq Cryst. 1981;72:133–137.
   Web of Science ®Google Scholar
• Chatopadhayay P, Roy S. Splay and bend elastic constants in 7CB and 8CB. Mol Cryst Liq Cryst. 1994;257:89–98.
   Web of Science ®Google Scholar
• Ren H, Wu S-T, Lin Y-H. In situ observation of fringing-field-induced phase separation in a liquid-crystal–monomer mixture. Phys Rev Lett. 2008;100:117801.
   PubMed Web of Science ®Google Scholar
• Humar M, Ravnik M, Pajk S, et al. Electrically tunable liquid crystal optical microresonators. Nat Photonics. 2009;3:595–600.
   Web of Science ®Google Scholar
• Zhang R, Zhou Y, Martínez-González JA, et al. Controlled deformation of vesicles by flexible structured media. Sci Adv. 2016;2:e1600978.
   PubMed Web of Science ®Google Scholar