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    New highly fluorescent pH indicator for ratiometric RGB imaging of pCO2 (2014)
    IOP Publishing
    In:  Methods and Applications in Fluorescence, 2 (2). 024001.
    Details
    Publication Date: 2016-04-29
    Description: A new diketo-pyrrolo-pyrrole (DPP) indicator dye for optical sensing of carbon dioxide is prepared via a simple one step synthesis from commercially available low cost 'Pigment Orange 73'. The pigment is modified via alkylation of one of the lactam nitrogens with a tert-butylbenzyl group. The indicator dye is highly soluble in organic solvents and in polymers and shows pH-dependent absorption (λmax 501 and 572 nm for the protonated and deprotonated forms, respectively) and emission spectra (λmax 524 and 605 nm for the protonated and deprotonated forms, respectively). Both the protonated and the deprotonated forms show high fluorescence quantum yields (Φprot 0.86; Φdeprot 0.66). Hence, colorimetric read-out and ratiometric fluorescence intensity measurements are possible. The emission of the two forms of the indicator excellently matches the response of the green and the red channels of an RGB camera. This enables imaging of carbon dioxide distribution with a simple and low cost optical set-up. The sensor based on the new DPP dye shows very high sensitivity and is particularly promising for monitoring atmospheric levels of carbon dioxide.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1088/2050-6120/2/2/024001
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Atomic force microscopy of confined liquids using the thermal bending fluctuations of the cantilever (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-06-22
    Description: Author(s): Fei Liu, Sissi de Beer, Dirk van den Ende, and Frieder Mugele We use atomic force microscopy to measure the distance-dependent solvation forces and the dissipation across liquid films of octamethylcyclotetrasiloxane (OMCTS) confined between a silicon tip and a highly oriented pyrolytic graphite substrate without active excitation of the cantilever. By analyzin... [Phys. Rev. E 87, 062406] Published Fri Jun 21, 2013
    Keywords: Films, Interfaces, and Crystal Growth
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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