title: Temperature-controlled 'breathing' of carbon dioxide bubbles.
abstract: We report a microfluidic (MF) approach to studies of temperature mediated carbon dioxide (CO(2)) transfer between the gas and the liquid phases. Micrometre-diameter CO(2) bubbles with a narrow size distribution were generated in an aqueous or organic liquid and subsequently were subjected to temperature changes in the downstream channel. In response to the cooling-heating-cooling cycle the bubbles underwent corresponding contraction-expansion-contraction transitions, which we term 'bubble breathing'. We examined temperature-controlled dissolution of CO(2) in four exemplary liquid systems: deionized water, a 0.7 M aqueous solution of NaCl, ocean water extracted from Bermuda coastal waters, and dimethyl ether of poly(ethylene glycol), a solvent used in industry for absorption of CO(2). The MF approach can be extended to studies of other gases with a distinct, temperature-dependent solubility in liquids.
authors.affiliation: Department of Chemistry, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Ethan
authors.initials: E
authors.lastname: Tumarkin
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Nie
authors.forename: Jai Il
authors.initials: JI
authors.lastname: Park
authors.forename: Milad
authors.initials: M
authors.lastname: Abolhasani
authors.forename: Jesse
authors.initials: J
authors.lastname: Greener
authors.forename: Barbara
authors.initials: B
authors.lastname: Sherwood-Lollar
authors.forename: Axel
authors.initials: A
authors.lastname: Günther
authors.forename: Eugenia
authors.initials: E
authors.lastname: Kumacheva
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D004987:Ethers / Q000737:chemistry; D046210:Microfluidic Analytical Techniques; D044367:Phase Transition; D011092:Polyethylene Glycols / Q000737:chemistry; D012623:Seawater / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D012995:Solubility; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D004987:Ethers; D012997:Solvents; C518220:poly(ethylene glycol) dimethyl ether; D014867:Water; D002245:Carbon Dioxide; D011092:Polyethylene Glycols; D012965:Sodium Chloride