Researchers are developing a nano-material they hope will pinpoint exact locations of structural strain; the nanomaterial will self-diagnose dynamically and measure the strain. Image: Courtesy Nanosi Advanced Technology Inc. Top sample contains imbedded fluorescent silicon nanoparticles; the bottom sample doesn’t. The material is fluorescent silicon nanoparticles (Si-NP), and the research seeks to validate relationships between the Si-NP fluorescence peak and the macro-level state of strain. The success of the research revolves around a phenomenon known as the Stokes shift, which refers to the longer wavelength of electromagnetic energy emitted as a result of losing some absorbed energy, says Charles Marsh,
The 2016 Summer Olympics boating and swimming events have put an international spotlight on what has been a long-running problem in Rio de Janeiro—untreated sewage and trash are clogging up major bays and waterways.