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Light Alters Film’s Degree of Wetness

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David Shenkenberg

Researchers at Pohang University of Science and Technology in South Korea have developed a film that can become wet or dry upon exposure to different wavelengths of light. Eventually, it could serve as a biosensor, a microfluidic device or an intelligent membrane. To make the material, the scientists alternately deposited layers of positively charged poly(allylamine hydrochloride) and negatively charged silicon dioxide nanoparticles on a silicon wafer, and the opposing charges enabled them to self-assemble. Then they coated the resulting material with a photoswitchable agent. For 10...Read full article

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    Published: December 2006
    Glossary
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    Basic Scienceintelligent membranemicrofluidic deviceMicroscopynanophotonicsPohang University of Science and TechnolotyResearch & TechnologySensors & DetectorsTech Pulse

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