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

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 respons...

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Published inACS applied materials & interfaces Vol. 10; no. 38; pp. 32678 - 32687
Main Authors Dugger, Jason W, Li, Wei, Chen, Mingtao, Long, Timothy E, Welbourn, Rebecca J. L, Skoda, Maximilian W.A, Browning, James F, Kumar, Rajeev, Lokitz, Bradley S
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 26.09.2018
American Chemical Society (ACS)
Subjects
electric field
interfacial tension
ionic block copolymer
MATERIALS SCIENCE
molecular dynamics
neutron reflectometry
ionic block copolymer
interfacial tension
electric field
molecular dynamics
neutron reflectometry
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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.
AbstractList 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 non-monotonic trend in thickness change as a function of field strength. This behavior was attributed to elastic responses of microphase separated diblock copolymer chains to variations in interfacial tension of polymer-polymer interfaces, arising from the redistribution of counteranions in the presence of electric fields.
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. Furthermore, 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.
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.
Author Kumar, Rajeev
Long, Timothy E
Skoda, Maximilian W.A
Li, Wei
Chen, Mingtao
Browning, James F
Dugger, Jason W
Lokitz, Bradley S
Welbourn, Rebecca J. L
AuthorAffiliation Neutron Scattering Division
Center for Nanophase Materials Sciences
Macromolecules Innovation Institute (MII), Department of Chemistry
Science and Technology Facilities Council, Rutherford Appleton Laboratory
Computational Sciences and Engineering Division
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interfacial tension
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molecular dynamics
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SubjectTerms electric field
interfacial tension
ionic block copolymer
MATERIALS SCIENCE
molecular dynamics
neutron reflectometry
Title Nanoscale Resolution of Electric-field Induced Motion in Ionic Diblock Copolymer Thin Films
URI http://dx.doi.org/10.1021/acsami.8b11220
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