Imagine sportswear that not only stays dry through the most sweat-inducing workouts, but also turns perspiration into a design element. Named after the driest desert in the world, Atacama uses microfluidic technology to create textiles that can do just that. The recipient of a grant from the National Science Foundation, Atacama is also exploring how its technology can be applied in a diverse range of industries, including apparel, auto manufacturing, and healthcare.
The medical industry started using microfluidics in the 1980s for lab-on-a-chip devices that allow researchers to use very small samples of blood and other fluids. By figuring out how to integrate microfluidics into textiles, Atacama can create activewear that feels more comfortable because almost all of the fabric remains dry. While most moisture-wicking fabrics currently on the market draw sweat to the surface of clothing so it evaporates more quickly, microfluidics directs moisture into tiny three-dimensional channels and then controls the direction of the fluid so it collects or drips off textiles exactly where manufacturers wants it to.
Atacamas tech was created by a group of UC Davis researchers including Siyuan (Alex) Xing, who is now the startups chief scientist. Xing tells TechCrunch that the biggest challenge they faced was that most microfabrication processes used to make microfluidic devices, including photolithography and laser cutting, were developed for rigid substrates such as silicon wafers and glass. This made it hard to create channels on fabric. Finally, they realized that the solution needs to come from the fabric side.
The team studied textile manufacturing methods and figured out which ones can be used to create microfluidic channels in a cost-effective way. They took a close look at embroidery, weaving, textile printing, and knitting, as well as the latest state-of-the-art machinery used for those techniques.
For example, in knitting, people have been using jacquard knitting to create different patterns on the front and back of fabrics. The resolution of the pattern is actually as fine as one loop, which can be around 100 micrometers and is 3D, Xing says. In embroidery, the needle is manipulating a single strand of yarn through a fabric substrate, similar to a through hole on a microfluidic chip. Once we understood how textile manufacturing methods could serve as an alternative to microfabrication, we became confident in our ability to create and pattern microstructures in textiles.
After a paper Xing co-authored about his findings caught the attention of several manufacturers in the military, healthcare, and automotive sectors, a friend introduced him to Susan Neal, who had previously served in leadership roles at Mens Wearhouse and Gymboree. He asked her to join Atacamas board to help him talk to companies. Neal decided to take on Atacamas CEO position after seeing Xing demonstrate its technology.
It was at a board meeting where I saw the prototype, a shirt, that they had developed. Seeing it work and in action, it had that wow factor, says Neal.
She adds, He was able to directionally control moisture as it moves through the surface of fabric. First of all, Id never seen that before. I run and do Bikram yoga and were all used to moisture-wicking fabric that just pulls sweat and spreads it. Alex demonstrated how he could directionally control moisture, move it from the skin to the outside of the shirt, and then have it drip off. The shirt remains absolutely dry, and its something youve just never seen.
While Atacamas tech has been applied mostly to synthetics like polyester and nylon, the company is also testing it on natural fibers like cotton and merino wool. Consumer products using the technology arent on the market yet, but Neal says Atacama is developing prototypes with several companies. Being able to manipulate how fluid travels over the surface of fabric in channels means Atacamas technology can be incorporated into apparel design and shown off, a potential selling point for sportswear labels.
While its most obvious use is for workout gear and other apparel (in dress shirts, for instance, Atacamas tech can prevent underarm stains), it also has a whole host of other potential applications. For example, it can be used in protective clothing or to create better diapers, bandages, casts, and hospital linen.
Weve been asked to look at car seats. What were finding is that there is a lot of interest in this technology to keep moisture and spilled drinks away from electronics in autonomous cars, says Neal.
Because the technology is so new, there has been some great dialogue with the scientists, she adds. Theyve been asked, can it do this or that, and they go back into the lab to figure out more ideas where it can be useful.