Pick a Color… Any Color

Researchers Developing Cheaper Color-Changing Windows.

Noting that “windows that change color in response to changes in the weather can help save on electricity costs by absorbing sunlight in the winter and reflecting it in the summer,” but “they are expensive and not widely used,” Technology Review (12/4, Bourzac) reports, “Now researchers are developing cheap printing methods for making these electrochromic systems, and hope to make electrochromic films that can be cut to fit existing windows.” The article explains that “electrochromic windows sandwich materials that change color when a small electrical field is applied across them. This change is triggered by changes in light or temperature measured by sensors.” One of the researchers said that “spraying the films is not only a cheaper alternative,” but “it also provides some advantages in performance.” They “found that adding a small amount of lithium to the nickel-oxide ink solution before it’s printed made for a film that changes color much faster and within a wider range.”

Reposted from ASEE First Bell for 12/4/09

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