کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5009150 | 1462043 | 2017 | 8 صفحه PDF | دانلود رایگان |
- New core/shell microcapsule-based fluorescent probes are presented.
- They can be used for early visual detection of microcracks in structural materials.
- The microcapsules are based on UV-screening shell and fluorescent liquid core.
- UV-screening shell prevents unwanted fluorescence emission from intact microcapsules.
- These microcapsules exhibit superior solvent resistance over dwell time.
Core/shell microcapsule-based fluorescent probes are presented in this work for potential use as early visual detection tool of microcracks in structural materials. A new microcapsule-based system is developed consisting of a UV-screening polyurea shell containing a fluorescent liquid core. The UV-screening functionality allows to prevent unwanted fluorescence emission from intact microcapsules upon UV-light exposure and yields excellent visibility contrast of the locally damaged region where fluorescent liquid core released from ruptured microcapsules is present. In addition, by carefully tuning the chemical composition of the shell material, microcapsules with enhanced chemical stability can be formed, as demonstrated by their superior solvent resistance over dwell time originating from the highly crosslinked shell structure that prevents core extraction from the microcapsules. A thorough chemical, thermal, morphological and optical characterization combined with a functional demonstration of the damage visualization capabilities of this new microcapsule-based system highlights its potential as a highly chemically-stable damage sensor for microcrack detection in structural materials.
Journal: Sensors and Actuators B: Chemical - Volume 248, September 2017, Pages 35-42