Bending nematic liquid crystal membranes with phospholipids

Jenieve Cumberland, Tetiana Lopatkina, Matthew Murachver, Piotr Popov, Viktor Kenderesi, A. Buka, Elizabeth K. Mann, Antal Jákli

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The interactions of phospholipids with liquid crystals have formed the basis for attractive biosensor technologies, but many questions remain concerning the basic physics and chemistry of these interactions. Phospholipids such as 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC), at sufficiently high (∼1 μM) concentrations and/or sufficiently long times, turn the liquid crystal director perpendicular to the LC/water interface. If the other side of the LC film is in contact with a surface that prefers perpendicular alignment, the LC film appears completely dark between crossed polarizers. Recently, however, Popov et al. (J. Mater. Chem. B, 2017, 5, 5061) noted that at even higher (∼10 μM) DLPC concentrations, the liquid crystal texture brightens again between crossed polarizers. To explain this surprising observation, it was suggested that the LC interface might bend. In this paper we show by optical surface profiler measurements that indeed the interface of the LC film of 4-cyano-4′-octylbiphenyl (8CB) suspended in a transmission electron microscopy (TEM) grid with openings of ∼0.5 mm in diameter bends towards the lipid-coated interface. We demonstrate that where the bending occurs, the bent interface exhibits extreme sensitivity to air pressure variations, producing an optical response with acoustic stimulation. Finally, we suggest a physical mechanism for this astonishing result.

Original languageEnglish
Pages (from-to)7003-7008
Number of pages6
JournalSoft Matter
Volume14
Issue number34
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Liquid Crystals
Nematic liquid crystals
Phospholipids
liquid crystals
membranes
Membranes
polarizers
Surface measurement
Biosensors
Physics
Textures
Acoustics
Transmission electron microscopy
Lipids
stimulation
bioinstrumentation
Water
lipids
Air
textures

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Cumberland, J., Lopatkina, T., Murachver, M., Popov, P., Kenderesi, V., Buka, A., ... Jákli, A. (2018). Bending nematic liquid crystal membranes with phospholipids. Soft Matter, 14(34), 7003-7008. https://doi.org/10.1039/c8sm01193a

Bending nematic liquid crystal membranes with phospholipids. / Cumberland, Jenieve; Lopatkina, Tetiana; Murachver, Matthew; Popov, Piotr; Kenderesi, Viktor; Buka, A.; Mann, Elizabeth K.; Jákli, Antal.

In: Soft Matter, Vol. 14, No. 34, 01.01.2018, p. 7003-7008.

Research output: Contribution to journalArticle

Cumberland, J, Lopatkina, T, Murachver, M, Popov, P, Kenderesi, V, Buka, A, Mann, EK & Jákli, A 2018, 'Bending nematic liquid crystal membranes with phospholipids', Soft Matter, vol. 14, no. 34, pp. 7003-7008. https://doi.org/10.1039/c8sm01193a
Cumberland J, Lopatkina T, Murachver M, Popov P, Kenderesi V, Buka A et al. Bending nematic liquid crystal membranes with phospholipids. Soft Matter. 2018 Jan 1;14(34):7003-7008. https://doi.org/10.1039/c8sm01193a
Cumberland, Jenieve ; Lopatkina, Tetiana ; Murachver, Matthew ; Popov, Piotr ; Kenderesi, Viktor ; Buka, A. ; Mann, Elizabeth K. ; Jákli, Antal. / Bending nematic liquid crystal membranes with phospholipids. In: Soft Matter. 2018 ; Vol. 14, No. 34. pp. 7003-7008.
@article{d7df133fdace43b6bd413a4022de6be8,
title = "Bending nematic liquid crystal membranes with phospholipids",
abstract = "The interactions of phospholipids with liquid crystals have formed the basis for attractive biosensor technologies, but many questions remain concerning the basic physics and chemistry of these interactions. Phospholipids such as 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC), at sufficiently high (∼1 μM) concentrations and/or sufficiently long times, turn the liquid crystal director perpendicular to the LC/water interface. If the other side of the LC film is in contact with a surface that prefers perpendicular alignment, the LC film appears completely dark between crossed polarizers. Recently, however, Popov et al. (J. Mater. Chem. B, 2017, 5, 5061) noted that at even higher (∼10 μM) DLPC concentrations, the liquid crystal texture brightens again between crossed polarizers. To explain this surprising observation, it was suggested that the LC interface might bend. In this paper we show by optical surface profiler measurements that indeed the interface of the LC film of 4-cyano-4′-octylbiphenyl (8CB) suspended in a transmission electron microscopy (TEM) grid with openings of ∼0.5 mm in diameter bends towards the lipid-coated interface. We demonstrate that where the bending occurs, the bent interface exhibits extreme sensitivity to air pressure variations, producing an optical response with acoustic stimulation. Finally, we suggest a physical mechanism for this astonishing result.",
author = "Jenieve Cumberland and Tetiana Lopatkina and Matthew Murachver and Piotr Popov and Viktor Kenderesi and A. Buka and Mann, {Elizabeth K.} and Antal J{\'a}kli",
year = "2018",
month = "1",
day = "1",
doi = "10.1039/c8sm01193a",
language = "English",
volume = "14",
pages = "7003--7008",
journal = "Soft Matter",
issn = "1744-683X",
publisher = "Royal Society of Chemistry",
number = "34",

}

TY - JOUR

T1 - Bending nematic liquid crystal membranes with phospholipids

AU - Cumberland, Jenieve

AU - Lopatkina, Tetiana

AU - Murachver, Matthew

AU - Popov, Piotr

AU - Kenderesi, Viktor

AU - Buka, A.

AU - Mann, Elizabeth K.

AU - Jákli, Antal

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The interactions of phospholipids with liquid crystals have formed the basis for attractive biosensor technologies, but many questions remain concerning the basic physics and chemistry of these interactions. Phospholipids such as 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC), at sufficiently high (∼1 μM) concentrations and/or sufficiently long times, turn the liquid crystal director perpendicular to the LC/water interface. If the other side of the LC film is in contact with a surface that prefers perpendicular alignment, the LC film appears completely dark between crossed polarizers. Recently, however, Popov et al. (J. Mater. Chem. B, 2017, 5, 5061) noted that at even higher (∼10 μM) DLPC concentrations, the liquid crystal texture brightens again between crossed polarizers. To explain this surprising observation, it was suggested that the LC interface might bend. In this paper we show by optical surface profiler measurements that indeed the interface of the LC film of 4-cyano-4′-octylbiphenyl (8CB) suspended in a transmission electron microscopy (TEM) grid with openings of ∼0.5 mm in diameter bends towards the lipid-coated interface. We demonstrate that where the bending occurs, the bent interface exhibits extreme sensitivity to air pressure variations, producing an optical response with acoustic stimulation. Finally, we suggest a physical mechanism for this astonishing result.

AB - The interactions of phospholipids with liquid crystals have formed the basis for attractive biosensor technologies, but many questions remain concerning the basic physics and chemistry of these interactions. Phospholipids such as 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC), at sufficiently high (∼1 μM) concentrations and/or sufficiently long times, turn the liquid crystal director perpendicular to the LC/water interface. If the other side of the LC film is in contact with a surface that prefers perpendicular alignment, the LC film appears completely dark between crossed polarizers. Recently, however, Popov et al. (J. Mater. Chem. B, 2017, 5, 5061) noted that at even higher (∼10 μM) DLPC concentrations, the liquid crystal texture brightens again between crossed polarizers. To explain this surprising observation, it was suggested that the LC interface might bend. In this paper we show by optical surface profiler measurements that indeed the interface of the LC film of 4-cyano-4′-octylbiphenyl (8CB) suspended in a transmission electron microscopy (TEM) grid with openings of ∼0.5 mm in diameter bends towards the lipid-coated interface. We demonstrate that where the bending occurs, the bent interface exhibits extreme sensitivity to air pressure variations, producing an optical response with acoustic stimulation. Finally, we suggest a physical mechanism for this astonishing result.

UR - http://www.scopus.com/inward/record.url?scp=85052728682&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85052728682&partnerID=8YFLogxK

U2 - 10.1039/c8sm01193a

DO - 10.1039/c8sm01193a

M3 - Article

C2 - 30109339

AN - SCOPUS:85052728682

VL - 14

SP - 7003

EP - 7008

JO - Soft Matter

JF - Soft Matter

SN - 1744-683X

IS - 34

ER -