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Physics Conference Room, SB B326
Coffee starts at 12:00 PM and talk starts at 12:15 PM
Apr '15
Alexander Greer  -  Monday, April 13, 2015
ABSTRACT: A phase-separated approach to reactive oxygen species that employs a liquid at a solid/liquid or solid/gas/liquid interface has been developed. Biphasic and triphasic photosensitizer systems contain regions that are controllably dry, partly wetted, and/or fully wetted. The talk will focus on a superhydrophobic surface fabricated by embedding silicon phthalocyanine sensitizing particles to specific locations on 3-D printed polydimethylsiloxane (PDMS) posts. In the presence of visible light and oxygen, singlet oxygen is formed on the superhydrophobic surface and reacts with an anthracene compound within a freestanding water droplet to produce an endoperoxide. The results indicate that the superhydrophobic sensitizer surface offers a unique system to study reactive singlet oxygen (1O2) transfer routes where a balance of gas and liquid contributions of 1O2 is tunable within the same superhydrophobic surface. Two microphotoreactor devices will also be described. In all, these systems physically isolate the photosensitizer from the solution which may be of practical importance for delivering singlet oxygen for water purification and medical devices.
1. D. Aebisher; D. Bartusik; Y. Liu; Y. Zhao; M. Barahman; Q. Xu; A. M. Lyons; A. Greer "Superhydrophobic Photosensitizers.  Mechanistic Studies of 1O2 Generation in the Plastron and Solid/Liquid Droplet Interface" J. Am. Chem. Soc. 2013, 135, 18990-18998.
2. Y. Zhao; Y. Liu; Q. Xu; M. Barahman; D. Bartusik; A. Greer; A. M. Lyons "Singlet Oxygen Generation on Porous Superhydrophobic Surfaces: Effect of Gas Flow and Sensitizer Wetting on Trapping Efficiency" J. Phys. Chem. A 2014, 118, 10364-10371.
3. D. Bartusik; D. Aebisher; A. M. Lyons; A. Greer "Bacterial Inactivation by a Singlet Oxygen Bubbler: Identifying Factors Controlling the Toxicity of 1O2 Bubbles" Environ. Sci. Technol. 2012, 46, 12098-12104.
4. D. Bartusik; D. Aebisher; B. Ghafari; A. M. Lyons; A. Greer  "Generating Singlet Oxygen Bubbles: A New Mechanism for Gas-Liquid Oxidations in Water" Langmuir 2012, 28, 3053-3060.
5. R. Choudhury; A. Greer "Synergism Between Airborne Singlet Oxygen and a Trisubstituted Olefin Sulfonate for the Inactivation of Bacteria" Langmuir 2014, 30, 3599-3605.
Apr '15
Mark Feuer  -  Monday, April 20, 2015
College of Staten Island of CUNY
Apr '15
Emily Rice  -  Monday, April 27, 2015
Exploring exoplanets
College of Staten Island of CUNY
ABSTRACT: Exoplanets are everywhere in the Milky Way Galaxy, and likely the Universe, according to the most recent results from NASA's Kepler mission and other surveys. But how close are we to finding a habitable planet like Earth or to answering the eternal question, Are we alone in the Universe? I will explain how we came to understand the ubiquity of exoplanets, describe the complexity of the current census, and foreshadow what discoveries are likely to lie ahead in the coming years.