ArticleScience advances2023
Revealing molecular diffusion dynamics in polymer microspheres by optical resonances.
Article in Science advances, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed.
- Precision oncology at the nanoscale: nano-optical biosensors for early cancer detection.RSC advances · 2026Review
- Edible optical microcavities for optical barcoding, authentication, and sensing.Scientific reports · 2026Article
- A Versatile Approach to Stabilize Whispering Gallery Microresonators Toward Reliable Photonic Labeling.The journal of physical chemistry letters · 2026Article
- Laser-emitting aqueous bioreactors for ultrasensitive bioactivity analysis.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Unveiling local molecular desorption dynamics using higher-order optical resonances.Frontiers of optoelectronics · 2025Article
- A Novel Fiber-Optical Fabry-Perot Microtip Sensor for 2-Propanol.Sensors (Basel, Switzerland) · 2025Article
- Radiolabeling of Micro-/Nanoplastics via In-Diffusion.Nanomaterials (Basel, Switzerland) · 2023Article
Corrections and comments
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Authors and funding
9 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Understanding the diffusion of small molecules in polymer microsystems is of great interest in diverse fundamental and industrial research. Despite the rapidly advancing optical imaging and spectroscopic techniques, entities under investigation are usually limited to flat films or bulky samples. We demonstrate a route to in situ detection of diffusion dynamics in polymer micro-objects by means of optical whispering-gallery mode resonances. Through mode tracking, interactions between solvent molecules and polymer microspheres, including sorption, diffusion, and swelling can be quantitatively analyzed. A turning point of mode response is observed, while the diffusion exceeds the sub-wavelength-thick outermost layer as the radial extent of resonances and starts penetrating the inner core. The estimated solubility in the glassy polymer is consistent with the predicted value using Flory-Huggins theory. Besides, the non-Fickian contribution is analyzed in such a glassy polymer-penetrant system. Our work represents a high-precision and label-free approach to describing characteristics in diffusion dynamics.
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Registered trials
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