Molecular weight sensing properties of ionic liquid-polymer composite films: Theory and experiment

Bishnu P. Regmi, Nicholas C. Speller, Michael J. Anderson, Jean Olivier Brutus, Yonathan Merid, Susmita Das, Bilal El-Zahab, Daniel J. Hayes, Kermit K. Murray, Isiah M. Warner

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Ionic liquids (ILs) are rapidly emerging as important coating materials for highly sensitive chemical sensing devices. In this regard, we have previously demonstrated that a quartz crystal microbalance (QCM) coated with a binary mixture of an IL and cellulose acetate can be employed for detection and molecular weight estimation of organic vapors (J. Mater. Chem. 2012, 22, 13732). Herein, we report follow-up studies aimed at formulating the theoretical basis for our previously observed relationship between molecular weight and changes in the QCM parameters. In the current work, we have investigated the vapor sensing characteristics of a series of binary blends of ILs and polymers over a wider concentration range of analytes, and a quadratic equation for estimating the approximate molecular weight of an organic vapor is proposed. Additionally, the frequency (f) and dissipation factor (D) at multiple harmonics were measured by use of a quartz crystal microbalance with dissipation monitoring (QCM-D). These QCM-D data were then analyzed by fitting to various models. It is observed that the behavior of these films can be best described by use of the Maxwell viscoelastic model. In light of these observations, a plausible explanation for the correlation between the molecular weight of absorbed vapors and the QCM parameters is presented. Our previous findings appear to be a special case of this more general observation. Overall, these results underscore the true potential of IL-based composite materials for discrimination and molecular weight estimation of a broad range of chemical vapors. This journal is

Original languageEnglish (US)
Pages (from-to)4867-4878
Number of pages12
JournalJournal of Materials Chemistry C
Volume2
Issue number24
DOIs
StatePublished - Jun 28 2014

Fingerprint

Ionic Liquids
Quartz crystal microbalances
Composite films
Ionic liquids
Polymer films
Molecular weight
Vapors
Experiments
Binary mixtures
Cellulose
Polymers
Coatings
Monitoring
Composite materials

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Regmi, B. P., Speller, N. C., Anderson, M. J., Brutus, J. O., Merid, Y., Das, S., ... Warner, I. M. (2014). Molecular weight sensing properties of ionic liquid-polymer composite films: Theory and experiment. Journal of Materials Chemistry C, 2(24), 4867-4878. https://doi.org/10.1039/c3tc32528h
Regmi, Bishnu P. ; Speller, Nicholas C. ; Anderson, Michael J. ; Brutus, Jean Olivier ; Merid, Yonathan ; Das, Susmita ; El-Zahab, Bilal ; Hayes, Daniel J. ; Murray, Kermit K. ; Warner, Isiah M. / Molecular weight sensing properties of ionic liquid-polymer composite films : Theory and experiment. In: Journal of Materials Chemistry C. 2014 ; Vol. 2, No. 24. pp. 4867-4878.
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Regmi, BP, Speller, NC, Anderson, MJ, Brutus, JO, Merid, Y, Das, S, El-Zahab, B, Hayes, DJ, Murray, KK & Warner, IM 2014, 'Molecular weight sensing properties of ionic liquid-polymer composite films: Theory and experiment', Journal of Materials Chemistry C, vol. 2, no. 24, pp. 4867-4878. https://doi.org/10.1039/c3tc32528h

Molecular weight sensing properties of ionic liquid-polymer composite films : Theory and experiment. / Regmi, Bishnu P.; Speller, Nicholas C.; Anderson, Michael J.; Brutus, Jean Olivier; Merid, Yonathan; Das, Susmita; El-Zahab, Bilal; Hayes, Daniel J.; Murray, Kermit K.; Warner, Isiah M.

In: Journal of Materials Chemistry C, Vol. 2, No. 24, 28.06.2014, p. 4867-4878.

Research output: Contribution to journalArticle

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T1 - Molecular weight sensing properties of ionic liquid-polymer composite films

T2 - Theory and experiment

AU - Regmi, Bishnu P.

AU - Speller, Nicholas C.

AU - Anderson, Michael J.

AU - Brutus, Jean Olivier

AU - Merid, Yonathan

AU - Das, Susmita

AU - El-Zahab, Bilal

AU - Hayes, Daniel J.

AU - Murray, Kermit K.

AU - Warner, Isiah M.

PY - 2014/6/28

Y1 - 2014/6/28

N2 - Ionic liquids (ILs) are rapidly emerging as important coating materials for highly sensitive chemical sensing devices. In this regard, we have previously demonstrated that a quartz crystal microbalance (QCM) coated with a binary mixture of an IL and cellulose acetate can be employed for detection and molecular weight estimation of organic vapors (J. Mater. Chem. 2012, 22, 13732). Herein, we report follow-up studies aimed at formulating the theoretical basis for our previously observed relationship between molecular weight and changes in the QCM parameters. In the current work, we have investigated the vapor sensing characteristics of a series of binary blends of ILs and polymers over a wider concentration range of analytes, and a quadratic equation for estimating the approximate molecular weight of an organic vapor is proposed. Additionally, the frequency (f) and dissipation factor (D) at multiple harmonics were measured by use of a quartz crystal microbalance with dissipation monitoring (QCM-D). These QCM-D data were then analyzed by fitting to various models. It is observed that the behavior of these films can be best described by use of the Maxwell viscoelastic model. In light of these observations, a plausible explanation for the correlation between the molecular weight of absorbed vapors and the QCM parameters is presented. Our previous findings appear to be a special case of this more general observation. Overall, these results underscore the true potential of IL-based composite materials for discrimination and molecular weight estimation of a broad range of chemical vapors. This journal is

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