Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement

Hanim Kim; Seong Ho Ryu; Michael Tuchband; Tae Joo Shin; Eva Korblova; David M. Walba; Noel A. Clark; Dong Ki Yoon

doi:10.1126/sciadv.1602102

Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement

Hanim Kim, Seong Ho Ryu, Michael Tuchband, Tae Joo Shin, Eva Korblova, David M. Walba, Noel A. Clark, Dong Ki Yoon

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

A lamellar liquid crystal (LC) phase of certain bent-core mesogenic molecules can be grown in a manner that generates a single chiral helical nanofilament in each of the cylindrical nanopores of an anodic aluminum oxide (AAO) membrane. By introducing guest molecules into the resulting composite chiral nanochannels, we explore the structures and functionality of the ordered guest/host LC complex, verifying the smectic-like positional order of the fluidic nematic LC phase, which is obtained by the combination of the LC organization and the nanoporous AAO superstructure. The guest nematic LC 4′-n-pentyl-4-cyanobiphenyl is found to form a distinctive fluid layered ordered LC complex at the nanofilament/guest interface with the host 1,3-phenylene bis[4-(4-nonyloxyphenyliminomethyl)benzoate], where this interface contacts the AAO cylinder wall. Filament growth form is strongly influenced by mixture parameters and pore dimensions.

Original language	English (US)
Article number	e1602102
Journal	Science Advances
Volume	3
Issue number	2
DOIs	https://doi.org/10.1126/sciadv.1602102
State	Published - Feb 2017

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation, funded by the Korean Government Ministry of Science, ICT and Future Planing (MSIP) (grant 2014M3C1A3052537), Ministry of Education (MOE) (grant 2014S1A2A2027911), and by the Materials Research Science and Engineering Center Program funded by NSF (grant DMR-1420736). Experiments at the PLS-II were supported in part by MSIP and Pohang University of Science and Technology. Author contributions: H.K. and D.K.Y. designed the research. H.K., S.H.R., and T.J.S. performed the research. M.T., E.K., and D.M.W. contributed new reagents/analytic tools. H.K., D.M.W., N.A.C., and D.K.Y. analyzed the data. H.K., D.M.W., N.A.C., and D.K.Y. wrote the paper. Competing interests: D.K.Y. has a patent related to the work, 10-2014-0093515. The other authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Additional data related to this paper may be requested from the authors.

Publisher Copyright:
© 2017 The Authors, some rights reserved.

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title = "Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement",

abstract = "A lamellar liquid crystal (LC) phase of certain bent-core mesogenic molecules can be grown in a manner that generates a single chiral helical nanofilament in each of the cylindrical nanopores of an anodic aluminum oxide (AAO) membrane. By introducing guest molecules into the resulting composite chiral nanochannels, we explore the structures and functionality of the ordered guest/host LC complex, verifying the smectic-like positional order of the fluidic nematic LC phase, which is obtained by the combination of the LC organization and the nanoporous AAO superstructure. The guest nematic LC 4′-n-pentyl-4-cyanobiphenyl is found to form a distinctive fluid layered ordered LC complex at the nanofilament/guest interface with the host 1,3-phenylene bis[4-(4-nonyloxyphenyliminomethyl)benzoate], where this interface contacts the AAO cylinder wall. Filament growth form is strongly influenced by mixture parameters and pore dimensions.",

author = "Hanim Kim and Ryu, {Seong Ho} and Michael Tuchband and Shin, {Tae Joo} and Eva Korblova and Walba, {David M.} and Clark, {Noel A.} and Yoon, {Dong Ki}",

note = "Funding Information: This work was supported by the National Research Foundation, funded by the Korean Government Ministry of Science, ICT and Future Planing (MSIP) (grant 2014M3C1A3052537), Ministry of Education (MOE) (grant 2014S1A2A2027911), and by the Materials Research Science and Engineering Center Program funded by NSF (grant DMR-1420736). Experiments at the PLS-II were supported in part by MSIP and Pohang University of Science and Technology. Author contributions: H.K. and D.K.Y. designed the research. H.K., S.H.R., and T.J.S. performed the research. M.T., E.K., and D.M.W. contributed new reagents/analytic tools. H.K., D.M.W., N.A.C., and D.K.Y. analyzed the data. H.K., D.M.W., N.A.C., and D.K.Y. wrote the paper. Competing interests: D.K.Y. has a patent related to the work, 10-2014-0093515. The other authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Additional data related to this paper may be requested from the authors. Publisher Copyright: {\textcopyright} 2017 The Authors, some rights reserved.",

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AU - Walba, David M.

AU - Clark, Noel A.

AU - Yoon, Dong Ki

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Structural transitions and guest/host complexing of liquid crystal helical nanofilaments induced by nanoconfinement

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