According to foreign media New Atlas, although we have seen materials that can make people or objects "invisible" from heat detectors, they are usually only effective at one ambient temperature. However, experimental new materials can be adjusted according to users to work in a wide range. Thermal detection sensors, such as those found in night vision goggles, work by paying attention to the temperature difference between the surface of the object and its surrounding environment. Therefore, if both temperatures are the same, the object will still not be detected.
Although previously developed camouflage materials have successfully maintained a predetermined temperature, their adaptability is not very strong. That's where new technology appears. This is a flexible material developed by scientists at the University of California, San Diego. It consists of a waxy phase-change substance and a thermoelectric alloy sandwiched between elastomer sheets. It is powered by an integrated battery and controlled by the wearer through a wireless circuit board.
In response to the applied current, the alloy can change temperature in the range of 10ºC to 38ºC (50ºF to 100.5ºF) in less than a minute. This temperature change must be manually initiated by the user based on the currently observed ambient temperature. A phase change substance is included to prevent the wearer from generating heat with the camouflage material. It absorbs heat by melting and absorbing temperatures higher than or equal to 30ºC (86ºF) (surface temperature of human skin). At temperatures below 30ºC, it solidifies and acts as an insulator.
This material has been incorporated into the armband. In the end, the researchers hope to create a complete jacket, although the technology must be improved before then-at present, for example, the jacket weighs about 2 kg (4.5 pounds) and is about 5 mm thick, and can only work for an hour.
The paper on the research led by Professor Chen Renkun was recently published in the journal Advanced Functional Materials.
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