Microwave induced mechanical activation of hydrogel dimers
| Autor: | Scott Waitukaitis, Hamza K. Khattak, Aaron D. Slepkov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Soft robotics 02 engineering and technology General Chemistry Plasma 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Molecular physics Leidenfrost effect 0104 chemical sciences Vaporization Irradiation Soft matter 0210 nano-technology Microwave Mechanical energy |
| Zdroj: | Soft Matter. 15:5804-5809 |
| ISSN: | 1744-6848 1744-683X |
| DOI: | 10.1039/c9sm00756c |
| Popis: | When grape-sized aqueous dimers are irradiated in a microwave oven, an intense electromagnetic hotspot forms at their point of contact, often igniting a plasma. Here we show that this irradiation can result in the injection of mechanical energy. By examining irradiated hydrogel dimers through high-speed imaging, we find that they repeatedly bounce off of each other while irradiated. We determine that an average of 1 μJ of mechanical energy is injected into the pair during each collision. Furthermore, a characteristic high-pitched audio signal is found to accompany each collision. We show that both the audio signal and the energy injection arise via an interplay between vaporization and elastic deformations in the region of contact, the so-called 'elastic Liedenfrost effect'. Our results establish a novel, non-contact method of injecting mechanical energy into soft matter systems, suggesting application in fields such as soft robotics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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