Anisotropic dye adsorption and anhydrous proton conductivity in smectic liquid crystal networks: the role of cross-link density, order, and orientation

T. Liang, H.P.C. Van Kuringen, D.J. Mulder, S. Tan, Y. Wu, Z. Borneman, K. Nijmeijer, A.P.H.J. Schenning

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)
143 Downloads (Pure)

Abstract

In this work, the decisive role of rigidity, orientation, and order in the smectic liquid crystalline network on the anisotropic proton and adsorbent properties is reported. The rigidity in the hydrogen-bonded polymer network has been altered by changing the cross-link density, the order by using different mesophases (smectic, nematic, and isotropic phases), whereas the orientation of the mesogens was controlled by alignment layers. Adding more cross-linkers improved the integrity of the polymer films. For the proton conduction, an optimum was found in the amount of cross-linker and the smectic organization results in the highest anhydrous proton conduction. The polymer films show anisotropic proton conductivity with a 54 times higher conductivity in the direction perpendicular to the molecular director. After a base treatment of the smectic liquid crystalline network, a nanoporous polymer film is obtained that also shows anisotropic adsorption of dye molecules and again straight smectic pores are favored over disordered pores in nematic and isotropic networks. The highly cross-linked films show size-selective adsorption of dyes. Low cross-linked materials do not show this difference due to swelling, which decreases the order and creates openings in the two-dimensional polymer layers. The latter is, however, beneficial for fast adsorption kinetics.

Original languageEnglish
Pages (from-to)35218-35225
Number of pages8
JournalACS Applied Materials & Interfaces
Volume9
Issue number40
DOIs
Publication statusPublished - 11 Oct 2017

Keywords

  • adsorption
  • liquid crystalline networks
  • nanoporous polymers
  • proton conduction
  • smectic liquid crystals

Fingerprint Dive into the research topics of 'Anisotropic dye adsorption and anhydrous proton conductivity in smectic liquid crystal networks: the role of cross-link density, order, and orientation'. Together they form a unique fingerprint.

  • Cite this