The right temperature is important – whether in technical processes, for the quality of food and medicine or for the life of electronic components and batteries. For this purpose, the temperature indicators record (un)desired temperature increases, which can be reported later. Researchers from the group led by Prof. Dr. Karl Mandel, professor of inorganic chemistry at FAU, have succeeded in developing a new temperature indicator in the form of a micrometer-sized particle whose central component is rust. The results of the study are published in the journal Advanced materials.
The new temperature the indicator has decisive advantages over previous indicators: its small size means it can be applied flexibly, and the fact that it is made from readily available materials makes it cheap to manufacture. What makes it truly exceptional, however, is the modular structure of the particles, made of polymers and iron oxide as well as the magnetic reading process.
The modular design allows the indicator to be tailored to a specific application. The magnetic reading method allows the recorded information of the temperature indicators to be read even from the depths of a dark object or behind an opaque cover. This is not possible with many currently used indicators.
It is important to note that there is no real-time temperature monitoring as with a thermometer. Instead, the temperature indicator stores the maximum temperature ever reached in the past, ranging from 40 to 170 °C. This is particularly suitable for tracking the temperature history of a material that cannot be tracked with ordinary non-memory thermometers.
Jakob Reichstein et al, Temperature Recording with Magnetic Supraparticles, Advanced materials (2022). DOI: 10.1002/adma.202202683
Quote: Nano-rust: A Smart Additive for Autonomous Temperature Control (2022, July 5), Retrieved July 5, 2022, from https://phys.org/news/2022-07-nano-rust-smart-additive -autonomous-temperature.html
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