When working in the arctic cold conditions, the soldiers’ hands and feet are usually very cold. Scientists from Stanford University and the U.S. Army Natick Soldiers Research and Development Engineering Center have recently developed conductive fabrics that can be heated to help keep soldiers warm. Natick's Paola D'Angelo said that the United States Army has a special problem because its soldiers used cold gloves for cold weather designs that were designed 30 years ago and have poor thermal performance. The same is true of footwear.
Although some new equipment can keep soldiers warm in cold and cold conditions, these devices are usually overheated and cause them to sweat. Wet clothes increase the body's heat conduction velocity, and the cold effect and humidity will aggravate the loss of body temperature, resulting in prone to hypothermia. This can be fatal outdoors.
The US Army-funded basic research project is researching and developing new types of fabrics, focusing on gloves that are suitable for cold weather. The idea is to incorporate very fine silver nanowires into military grade fabrics such as polyester and cotton/nylon blends. By applying a three volt voltage to a 2.5 x 2.5 cm test sample 1, the temperature of the sample can be raised by 100°F (56°C) in one minute.
The ultimate goal of scientists is to produce uniforms that can withstand repeated cleaning, and soldiers can simply adjust the temperature. This will not only provide better warmth but also reduce sweating. To further reduce the load, researchers are looking for alternative power sources to reduce the demand for batteries.
To make improvements, the team also added a layer of hydrogel particles made of polyethylene glycol or poly(N-isopropylacrylamide). This hydrogel may be able to absorb sweat and prevent moisture from migrating from one fabric to another, making the soldier more comfortable. Although silver nanowires can be washed repeatedly, the team still needs to determine the durability of the hydrogel layer and its compatibility with nanowires.
The research results were published at the 254th National Conference and Exposition of the American Chemical Society.
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