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dc.contributor.authorHsieh, Kai-Taen_US
dc.contributor.authorUrban, Pawel L.en_US
dc.date.accessioned2014-12-08T15:36:45Z-
dc.date.available2014-12-08T15:36:45Z-
dc.date.issued2014-01-01en_US
dc.identifier.issn2046-2069en_US
dc.identifier.urihttp://dx.doi.org/10.1039/c4ra04207gen_US
dc.identifier.urihttp://hdl.handle.net/11536/25116-
dc.description.abstractVarious processes in chemistry lead to formation of spatial gradients, and cannot be directly studied using conventional spectroscopic techniques. Here we aimed to develop a simple method for the monitoring of light absorption at three wavelengths in two dimensions. The experimental setup consists of a commercial liquid crystal display (LCD) computer screen with light-emitting diode (LED) back illumination, and a digital camera equipped with a complementary metal oxide semiconductor imager. The computer screen serves as a multi-wavelength light source while the camera records distributions of the light transmitted through a two-dimensional non-homogeneous dynamic sample (reaction mixture). A program in C# language constantly changes the background colour of a console window, so as to alternately relay the light of different wavelength (lambda(max) = 608, 540, and 455 nm, respectively) onto the sample. The light emitted by the screen passes through a Petri dish containing the sample, while the digital camera records images revealing distributions of chemical substances absorbing at different wavelengths. The interval between two successive colour displays is 200-300 milliseconds. In this demonstration of the method, we followed two processes: the Belousov-Zhabotinsky oscillating reaction and the Old Nassau (Halloween) clock reaction. Every experiment produced a series of light absorption images corresponding to the wavelengths of the LCD/LED screen. Chemical front formation could be observed for analytes absorbing light at one of the three wavelength bands. In future, this approach can be extended to imaging at multiple wavelengths (by introducing customized LCD matrices and modified LED back illumination), and used in the monitoring of other non-homogeneous chemical processes.en_US
dc.language.isoen_USen_US
dc.titleSpectral imaging of chemical reactions using a computer display and a digital cameraen_US
dc.typeArticleen_US
dc.identifier.doi10.1039/c4ra04207gen_US
dc.identifier.journalRSC ADVANCESen_US
dc.citation.volume4en_US
dc.citation.issue59en_US
dc.citation.spage31094en_US
dc.citation.epage31100en_US
dc.contributor.department應用化學系zh_TW
dc.contributor.department應用化學系分子科學碩博班zh_TW
dc.contributor.departmentDepartment of Applied Chemistryen_US
dc.contributor.departmentInstitute of Molecular scienceen_US
Appears in Collections:Articles


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