| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Borisov, Sergey
Graz University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2024Transition metal azahemiporphycenes as singlet oxygen sensitizerscitations
- 2023Bright and Photostable TADF-Emitting Zirconium(IV) Pyridinedipyrrolide Complexes: Efficient Dyes for Decay Time-Based Temperature Sensing and Imagingcitations
- 2022Materials for optical oxygen sensing under high hydrostatic pressurecitations
- 2022Porous matrix materials in optical sensing of gaseous oxygencitations
- 2019High-resolution optical pH imaging of concrete exposed to chemically corrosive environmentscitations
- 2018Wide-range optical pH imaging of cementitious materials exposed to chemically corrosive environmentscitations
- 2018Mn4+-Doped magnesium titanate-a promising phosphor for self-referenced optical temperature sensingcitations
- 2018OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS
- 2018Macroporous Polymeric Oxygen Scavenger Material
- 2018New opportunities for optical temperature sensing with Mn<sup>4+</sup>-doped magnesium titanate
- 2013Tuning the dynamic range and sensitivity of optical oxygen-sensors by employing differently substituted polystyrene-derivativescitations
Places of action
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article
Wide-range optical pH imaging of cementitious materials exposed to chemically corrosive environments
Abstract
The pH of concrete‐based material is a key parameter for the assessment of its stability and durability, since a change in pH is usually associated with major types of chemical degradation such as carbonation, leaching and acid attacks. Conventional surface pH measurements with potentiometric flat surface electrodes have low spatial resolution, whereas optical pH visualization with indicator dyes (phenolphthalein) only indicates the areas with higher or lower pH than the pKa of the indicator. In this regard, it is key to develop wide‐range imaging systems, enabling accurate and spatially resolved determination of pH variability for an advanced knowledge of degradation mechanisms. This contribution presents the enhancements made for a high‐resolution optical pH imaging system based on fluorescent aza‐BODIPY indicator dyes. The measurement range was increased to 6 pH units (pH 6.5 to pH 12.5) by a combination of two indicator dyes. Moreover, background scattering effects were sufficiently eliminated. With the improved sensor foils steep pH gradients (up to 3 pH units within 2 mm) were successfully recorded in various concrete specimens using a macro lens reaching a resolution of down to 35 μm per pixel.