Current research
Currently, three projects are under investigation the Keirstead research group at UNE. Each project employs a photochemical probe reaction that was selected to learn more about the physicochemical properties of ionic liquids. Ionic liquids (ILs) are thought to be "green" alternatives to conventional solvents for chemical processes and could be employed in nanotechnology devices.
1) Quantifying the cage effect of ionic liquids using the photo-Fries reaction.
The goal of this project is to learn more about the "cage effect" of ILs, or how ILs "restrict" species within a solvent cage. A large cage effect could reduce the efficiency of a photovoltaic cell that uses an IL as the electrolyte, or could influence the product distribution of a chemical reaction.
2) Examining the photochromism of spiropyrans in ionic liquids using emission spectroscopy.
To explore the feasibility of using ILs as solvents for molecular devices, we are examining the dynamics of spiropyran photochromism in ILs. Spiropyrans are a class of photochromic "on-off" molecular switches that could be used as molecular electronic devices. We have used emission spectroscopy to show that the dynamics of the switch are slowed in ILs compared to molecular solvents, due to the unique properties of ILs. Specifically, our system could be used as a robust two-color (red and blue) emitting molecular switch.
3) Investigating the influence of ionic liquid media on the photoluminescence of siloles (with Jerry Mullin, UNE and Hank Tracy, USM).
Siloles are a class of substituted silacyclopentadienyl molecules that are thought to have applications as sensors and luminescent optoelectronic devices, e.g., OLEDs. Siloles typically have low fluorescence quantum yields when dissolved in organic solvents, but their emission increases when in a viscous or polar medium. In this project, we are investigating how the unique properties of ILs influence the photoluminescence of siloles, and in turn, more about the physicochemical properties of ILs.
Selected publications
Safe and Sustainable Chemistry Activities: Fostering a Culture of Safety in K-12 and Community Outreach Programs. Cannon, A.S., Keirstead, A.E., Hudson, R., Levy, I.J., MacKellar, J., Enright, M., Anderson, K.R., Howson, E.M. Journal of Chemical Education 2020, ASAP.
Wright, M.V.* and Keirstead, A.E. Innovation for a Healthier Student Chapter: Student Activities at the University of New England in Building and Maintaining Award-Winning ACS Student Member Chapters (Chapter 10) Volume 3; Mio, M.J., Benvenuto, M.A., Eds. ACS Symposium Series; American Chemical Society: Washington, DC, 2018; Vol 1229, pp 115-125. (DOI 10.1021/bk-2018-1278.ch010) (*UNE student)
1,1-Dimethyl-2,3,4,5-tetraphenylsilole as a Molecular Rotor Probe to Investigate the Microviscosity of Imidazolium Ionic Liquids. Scalise, Regina E.*; Caradonna, Peter A.*; Tracy, Henry J.; Mullin, Jerome L.; Keirstead, Amy E. Journal of Inorganic and Organometallic Polymers and Materials 2014, 24 (2), 431-441. (*UNE undergraduate students)
Direct observation of spiropyran phosphorescence in imidazolium ionic liquids. Naughton, Sean P.*; Gaudet, Robyn M.*; Leslie, Anne A.*, Keirstead, Amy E. Chemical Physics Letters 2013, 556, 102-107. (*UNE undergraduate students)
Photochemical Triode Molecular Signal Transducer. Keirstead, Amy E.; Bridgewater, James W.; Terazono, Yuichi; Kodis, Gerdenis; Straight, Stephen; Liddell, Paul A.; Moore, Ana L.; Moore, Thomas A.; Gust, Devens. Journal of the American Chemical Society 2010, 132(18), 6588-6595.
1-(3'-amino)propylsilatrane derivatives as covalent surface linkers to nanoparticulate metal oxide films for use in photoelectrochemical cells. Brennan, Bradley J.; Keirstead, Amy E.; Liddell, Paul A.; Vail, Sean A.; Moore, Thomas A.; Moore, Ana L.; Gust, Devens. Nanotechnology 2009, (20), 505203 (10 pp).
Porphyrin-Based Hole Conducting Electropolymer. Liddell, Paul A.; Gervaldo, Miguel; Bridgewater, James W.; Keirstead, Amy E.; Lin, Su; Moore, Thomas A.; Moore, Ana L.; Gust, Devens. Chemistry of Materials 2008, 20 (1), 135-142.
Other scholarly activity
Boucher, M.A. and Keirstead, A. E. Getting Ready for the ACS National Meeting. inChemistry (Volume 27, Winter 2018). Available online: http://inchemistry.acs.org/content/inchemistry/en/acs-and-you/getting-ready-for-an-acs-national-meeting.html (3/8/18)
Boucher, M.A. and Keirstead, A. E. How to Get an Awesome Recommendation Letter. inChemistry (Volume 27, Winter 2018). Available online: http://inchemistry.acs.org/content/inchemistry/en/college-life/recommendation-letter.html (12/4/17)
Keirstead, A. Maine Local Section Convenes Student Chapter Leaders. Chemical and Engineering News, 95 (47), p 36. (2017)
Funded grants
American Chemical Society Science Coach program; with co-applicant Seth Staples (Messalonskee High School/Sacopee Valley High School). 2013-14 and 2014-15, $500 each cycle.
http://cen.acs.org/articles/93/i24/ACS-Seeks-Science-Coaches.html
MRI: Acquisition of a Gas Chromatography-Mass Spectrometry Instrument for Research and Teaching. Ursula Roese PI; with co-PIs Amy Deveau, Teresa Dzieweczynski, Amy Keirstead and Stephan Zeeman. National Science Foundation 2012, $137,527.
Using the photo-Fries reaction as a photochemical probe to quantify the cage effects of ionic liquids (PI). Submitted to the American Chemical Society Petroleum Research Fund Undergraduate New Investigator Program, 2011, $50,000.
http://acswebcontent.acs.org/prfar/2012/media/keirstead.html
Exploring the Influence of Organized Media on the Photoluminescence Behavior of Siloles (PI, with co-PIs Jerome Mullin and Hank Tracy). Submitted to the Maine Space Grant Consortium Maine Space Grant Education and Seed Research Program (MSG/ESR), May 2010, $25,000.
