Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films

Jason W. Dugger, Wei Li, Mingtao Chen, Timothy Edward Long, Rebecca J.L. Welbourn, Maximilian W.A. Skoda, James F. Browning, Rajeev Kumar, Bradley S. Lokitz

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Understanding the responses of ionic block copolymers to applied electric fields is crucial when targeting applications in areas such as energy storage, microelectronics, and transducers. This work shows that the identity of counterions in ionic diblock copolymers substantially affects their responses to electric fields, demonstrating the importance of ionic species for materials design. In situ neutron reflectometry measurements revealed that thin films containing imidazolium based cationic diblock copolymers, tetrafluoroborate counteranions led to film contraction under applied electric fields, while bromide counteranions drove expansion under similar field strengths. Coarse-grained molecular dynamics simulations were used to develop a fundamental understanding of these responses, uncovering a nonmonotonic trend in thickness change as a function of field strength. This behavior was attributed to elastic responses of microphase separated diblock copolymer chains resulting from variations in interfacial tension of polymer-polymer interfaces due to the redistribution of counteranions in the presence of electric fields.

Original languageEnglish
Pages (from-to)32678-32687
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number38
DOIs
Publication statusPublished - 2018 Sep 26
Externally publishedYes

Fingerprint

Block copolymers
Electric fields
Thin films
Polymers
Bromides
Microelectronics
Energy storage
Surface tension
Molecular dynamics
Transducers
Neutrons
Computer simulation

Keywords

  • electric field
  • interfacial tension
  • ionic block copolymer
  • molecular dynamics
  • neutron reflectometry

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Dugger, J. W., Li, W., Chen, M., Long, T. E., Welbourn, R. J. L., Skoda, M. W. A., ... Lokitz, B. S. (2018). Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films. ACS Applied Materials and Interfaces, 10(38), 32678-32687. https://doi.org/10.1021/acsami.8b11220

Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films. / Dugger, Jason W.; Li, Wei; Chen, Mingtao; Long, Timothy Edward; Welbourn, Rebecca J.L.; Skoda, Maximilian W.A.; Browning, James F.; Kumar, Rajeev; Lokitz, Bradley S.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 38, 26.09.2018, p. 32678-32687.

Research output: Contribution to journalArticle

Dugger, JW, Li, W, Chen, M, Long, TE, Welbourn, RJL, Skoda, MWA, Browning, JF, Kumar, R & Lokitz, BS 2018, 'Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films', ACS Applied Materials and Interfaces, vol. 10, no. 38, pp. 32678-32687. https://doi.org/10.1021/acsami.8b11220
Dugger, Jason W. ; Li, Wei ; Chen, Mingtao ; Long, Timothy Edward ; Welbourn, Rebecca J.L. ; Skoda, Maximilian W.A. ; Browning, James F. ; Kumar, Rajeev ; Lokitz, Bradley S. / Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films. In: ACS Applied Materials and Interfaces. 2018 ; Vol. 10, No. 38. pp. 32678-32687.
@article{6434dfbbde384afe8ced4b02ceb499ef,
title = "Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films",
abstract = "Understanding the responses of ionic block copolymers to applied electric fields is crucial when targeting applications in areas such as energy storage, microelectronics, and transducers. This work shows that the identity of counterions in ionic diblock copolymers substantially affects their responses to electric fields, demonstrating the importance of ionic species for materials design. In situ neutron reflectometry measurements revealed that thin films containing imidazolium based cationic diblock copolymers, tetrafluoroborate counteranions led to film contraction under applied electric fields, while bromide counteranions drove expansion under similar field strengths. Coarse-grained molecular dynamics simulations were used to develop a fundamental understanding of these responses, uncovering a nonmonotonic trend in thickness change as a function of field strength. This behavior was attributed to elastic responses of microphase separated diblock copolymer chains resulting from variations in interfacial tension of polymer-polymer interfaces due to the redistribution of counteranions in the presence of electric fields.",
keywords = "electric field, interfacial tension, ionic block copolymer, molecular dynamics, neutron reflectometry",
author = "Dugger, {Jason W.} and Wei Li and Mingtao Chen and Long, {Timothy Edward} and Welbourn, {Rebecca J.L.} and Skoda, {Maximilian W.A.} and Browning, {James F.} and Rajeev Kumar and Lokitz, {Bradley S.}",
year = "2018",
month = "9",
day = "26",
doi = "10.1021/acsami.8b11220",
language = "English",
volume = "10",
pages = "32678--32687",
journal = "ACS applied materials & interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "38",

}

TY - JOUR

T1 - Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films

AU - Dugger, Jason W.

AU - Li, Wei

AU - Chen, Mingtao

AU - Long, Timothy Edward

AU - Welbourn, Rebecca J.L.

AU - Skoda, Maximilian W.A.

AU - Browning, James F.

AU - Kumar, Rajeev

AU - Lokitz, Bradley S.

PY - 2018/9/26

Y1 - 2018/9/26

N2 - Understanding the responses of ionic block copolymers to applied electric fields is crucial when targeting applications in areas such as energy storage, microelectronics, and transducers. This work shows that the identity of counterions in ionic diblock copolymers substantially affects their responses to electric fields, demonstrating the importance of ionic species for materials design. In situ neutron reflectometry measurements revealed that thin films containing imidazolium based cationic diblock copolymers, tetrafluoroborate counteranions led to film contraction under applied electric fields, while bromide counteranions drove expansion under similar field strengths. Coarse-grained molecular dynamics simulations were used to develop a fundamental understanding of these responses, uncovering a nonmonotonic trend in thickness change as a function of field strength. This behavior was attributed to elastic responses of microphase separated diblock copolymer chains resulting from variations in interfacial tension of polymer-polymer interfaces due to the redistribution of counteranions in the presence of electric fields.

AB - Understanding the responses of ionic block copolymers to applied electric fields is crucial when targeting applications in areas such as energy storage, microelectronics, and transducers. This work shows that the identity of counterions in ionic diblock copolymers substantially affects their responses to electric fields, demonstrating the importance of ionic species for materials design. In situ neutron reflectometry measurements revealed that thin films containing imidazolium based cationic diblock copolymers, tetrafluoroborate counteranions led to film contraction under applied electric fields, while bromide counteranions drove expansion under similar field strengths. Coarse-grained molecular dynamics simulations were used to develop a fundamental understanding of these responses, uncovering a nonmonotonic trend in thickness change as a function of field strength. This behavior was attributed to elastic responses of microphase separated diblock copolymer chains resulting from variations in interfacial tension of polymer-polymer interfaces due to the redistribution of counteranions in the presence of electric fields.

KW - electric field

KW - interfacial tension

KW - ionic block copolymer

KW - molecular dynamics

KW - neutron reflectometry

UR - http://www.scopus.com/inward/record.url?scp=85053691387&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85053691387&partnerID=8YFLogxK

U2 - 10.1021/acsami.8b11220

DO - 10.1021/acsami.8b11220

M3 - Article

AN - SCOPUS:85053691387

VL - 10

SP - 32678

EP - 32687

JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

SN - 1944-8244

IS - 38

ER -