An anonymous reader quotes a report from IEEE Spectrum: Today, a team of researchers at Stanford, led by materials science and engineering associate professor Alberto Salleo and postdoctoral research fellow Onur Parlak, announced in Science Advances that they've developed a wearable patch that can determine how much cortisol someone is producing in seconds, using sweat drawn from the skin under the patch. [Cortisol, a steroid hormone, goes up when a person is under physical or emotional strain.] The stretchy patch pulls in the sweat through perforations to a reservoir. A membrane on top of the reservoir allows charged ions, like sodium and potassium, to pass through. Cortisol, which has no charge, can't pass, and instead blocks the charged ions. Signals sent from an electrical sensor in the patch can be used to detect these backups and determine how much cortisol is in the sweat. The prototype cortisol detection patch channels sweat into a reservoir; a membrane selectively lets charged 查看全文>>