Homeotropic self-alignment of discotic liquid crystals for nanoporous polymer films

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Nanostructured polymer films with continuous, membrane-spanning pores from polymerizable hexagonal columnar discotic liquid crystals (LCs) were fabricated. A robust alignment method was developed to obtain homeotropic alignment of columns between glass surfaces by adding a small amount of a tri(ethylene glycol) modified analogue of the mesogen as a dopant that preferentially wets glass. The homeotropic LC alignment was fixated via a photoinitiated free radical copolymerization of a high-temperature tolerant trisallyl mesogen with a divinyl ester. Removal of the hydrogen-bonded template from the aligned columns afforded a nanoporous network with pores of nearly 1 nm in diameter perpendicular to the surface, and without noticeable collapse of the nanopores. The effect of pore orientation was demonstrated by an adsorption experiment in which homeotropic film showed a threefold increase in the initial uptake rate of methylene blue compared to planarly aligned films.

Original languageEnglish
Pages (from-to)6714-6724
Number of pages11
JournalACS Nano
Volume12
Issue number7
DOIs
Publication statusPublished - 24 Jul 2018

Fingerprint

self alignment
Polymer films
Liquid crystals
Liquid Crystals
liquid crystals
alignment
porosity
polymers
Glass
Nanopores
Ethylene Glycol
glass
Methylene Blue
methylene blue
copolymerization
Ethylene glycol
Free radicals
free radicals
Copolymerization
Free Radicals

Keywords

  • adsorption
  • homeotropic alignment
  • liquid crystals
  • nanoporous membranes
  • polymer network

Cite this

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title = "Homeotropic self-alignment of discotic liquid crystals for nanoporous polymer films",
abstract = "Nanostructured polymer films with continuous, membrane-spanning pores from polymerizable hexagonal columnar discotic liquid crystals (LCs) were fabricated. A robust alignment method was developed to obtain homeotropic alignment of columns between glass surfaces by adding a small amount of a tri(ethylene glycol) modified analogue of the mesogen as a dopant that preferentially wets glass. The homeotropic LC alignment was fixated via a photoinitiated free radical copolymerization of a high-temperature tolerant trisallyl mesogen with a divinyl ester. Removal of the hydrogen-bonded template from the aligned columns afforded a nanoporous network with pores of nearly 1 nm in diameter perpendicular to the surface, and without noticeable collapse of the nanopores. The effect of pore orientation was demonstrated by an adsorption experiment in which homeotropic film showed a threefold increase in the initial uptake rate of methylene blue compared to planarly aligned films.",
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author = "Lugger, {Jody A.M.} and Mulder, {Dirk J.} and Subham Bhattacharjee and Sijbesma, {Rint P.}",
year = "2018",
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}

Homeotropic self-alignment of discotic liquid crystals for nanoporous polymer films. / Lugger, Jody A.M.; Mulder, Dirk J.; Bhattacharjee, Subham; Sijbesma, Rint P.

In: ACS Nano, Vol. 12, No. 7, 24.07.2018, p. 6714-6724.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Homeotropic self-alignment of discotic liquid crystals for nanoporous polymer films

AU - Lugger, Jody A.M.

AU - Mulder, Dirk J.

AU - Bhattacharjee, Subham

AU - Sijbesma, Rint P.

PY - 2018/7/24

Y1 - 2018/7/24

N2 - Nanostructured polymer films with continuous, membrane-spanning pores from polymerizable hexagonal columnar discotic liquid crystals (LCs) were fabricated. A robust alignment method was developed to obtain homeotropic alignment of columns between glass surfaces by adding a small amount of a tri(ethylene glycol) modified analogue of the mesogen as a dopant that preferentially wets glass. The homeotropic LC alignment was fixated via a photoinitiated free radical copolymerization of a high-temperature tolerant trisallyl mesogen with a divinyl ester. Removal of the hydrogen-bonded template from the aligned columns afforded a nanoporous network with pores of nearly 1 nm in diameter perpendicular to the surface, and without noticeable collapse of the nanopores. The effect of pore orientation was demonstrated by an adsorption experiment in which homeotropic film showed a threefold increase in the initial uptake rate of methylene blue compared to planarly aligned films.

AB - Nanostructured polymer films with continuous, membrane-spanning pores from polymerizable hexagonal columnar discotic liquid crystals (LCs) were fabricated. A robust alignment method was developed to obtain homeotropic alignment of columns between glass surfaces by adding a small amount of a tri(ethylene glycol) modified analogue of the mesogen as a dopant that preferentially wets glass. The homeotropic LC alignment was fixated via a photoinitiated free radical copolymerization of a high-temperature tolerant trisallyl mesogen with a divinyl ester. Removal of the hydrogen-bonded template from the aligned columns afforded a nanoporous network with pores of nearly 1 nm in diameter perpendicular to the surface, and without noticeable collapse of the nanopores. The effect of pore orientation was demonstrated by an adsorption experiment in which homeotropic film showed a threefold increase in the initial uptake rate of methylene blue compared to planarly aligned films.

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KW - homeotropic alignment

KW - liquid crystals

KW - nanoporous membranes

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