Recyclable liquid crystal polymeric sensor beads based on the assistance of radially aligned liquid crystals

Jui Hsiang Liu, Yi Hua Hung, Ssu Ni Lin, Sergey A. Shvetsov, Vladimir Yu Rudyak, Alexander V. Emelyanenko, Chun Yen Liu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this study, we first demonstrate the synthesis of recyclable polymer beads for Cu2+ sensing based on radially aligned liquid crystal (LC) assistance. To detect metal ions in water, sensing probe monomers and polymers derived from rhodamine B were synthesized. Recyclable polymeric LC beads were prepared from LC monomers RM257 and RM105, a nonreactive mesogen of 5CB and a rhodamine B-derived monomer. Due to the assistance of radially aligned LCs, highly sterically hindered spirocyclic terminal groups of rhodamine B-derived monomers were aligned and fixed at the outer surface of liquid crystal beads. The color of the polymeric LC beads changed from light pink to deep pink after the beads were dropped into an aqueous Cu2+ solution. The results were ascribed to the spiro ring-opening mechanism. The addition of a nonreactive mesogen resulted in the porous structure of the polymeric LC beads. The high sensitivity of the Cu2+ solution using polymeric LC beads was confirmed. The fabricated polymeric LC beads were recycled by putting the polymeric LC beads into aqueous ammonia. The removal of Cu2+ from polymeric LC beads was due to the formation of [Cu(NH3)4]2+. This recyclable LC bead sensor is an easy method for the detection of metal ions in aqueous solutions.

Original languageEnglish
Pages (from-to)373-383
Number of pages11
JournalPolymer Journal
Issue number2
Publication statusPublished - 2021 Feb

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry


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