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Super, Michael

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Super, Michael

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2014 - 20152

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Author's Publications: search.filters.isAuthorOfPublication.2a6a269c-dd41-4c48-8b7d-ae8645dc0a2c

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    A bioinspired omniphobic surface coating on medical devices prevents thrombosis and biofouling
    (Nature Publishing Group, 2014) Leslie, Daniel; Waterhouse, Anna; Berthet, Julia B; Valentin, Thomas M; Watters, Alexander; Jain, Abhishek; Kim, Philseok; Hatton, Benjamin D; Nedder, Arthur; Donovan, Kathryn; Super, Elana H; Howell, Caitlin; Johnson, Christopher P; Vu, Thy L; Bolgen, Dana; Rifai, Sami; Hansen, Anne; Aizenberg, Michael; Super, Michael; Aizenberg, Joanna; Ingber, Donald
    Thrombosis and biofouling of extracorporeal circuits and indwelling medical devices cause significant morbidity and mortality worldwide. We describe a bioinspired coating that repels blood from virtually any material by covalently tethering a molecular layer of perfluorocarbon, which holds a thin liquid film of medical-grade perfluorocarbon on the substrate surface, mimicking the liquid layer certain plants use to prevent adhesion. This coating prevents fibrin attachment, reduces platelet adhesion and activation, suppresses biofilm formation, and is stable under blood flow in vitro. Surface-coated medical-grade tubing and catheters, assembled into arteriovenous shunts and implanted in living pigs, remain patent for at least 8 hours without anticoagulation. This coating technology offers the potential to significantly reduce anticoagulation in patients while preventing thrombotic occlusion and biofouling of medical devices.
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    Stability of Surface-Immobilized Lubricant Interfaces under Flow
    (American Chemical Society (ACS), 2015) Howell, Caitlin; Vu, Thy L.; Johnson, Christopher; Hou, Xu; Ahanotu, Onyemaechi; Alvarenga, Jack; Leslie, Daniel; Uzun, Oktay; Waterhouse, Anna; Kim, Philseok; Super, Michael; Aizenberg, Michael; Ingber, Donald; Aizenberg, Joanna
    The stability and longevity of surface-stabilized lubricant layers is a critical question in their application as low- and nonfouling slippery surface treatments in both industry and medicine. Here, we investigate lubricant loss from surfaces under flow in water using both quantitative analysis and visualization, testing the effects of underlying surface type (nanostructured versus flat), as well as flow rate in the physiologically relevant range, lubricant type, and time. We find lubricant losses on the order of only ng/cm2 in a closed system, indicating that these interfaces are relatively stable under the flow conditions tested. No notable differences emerged between surface type, flow rate, lubricant type, or time. However, exposure of the lubricant layers to an air/water interface did significantly increase the amount of lubricant removed from the surface, leading to disruption of the layer. These results may help in the development and design of materials using surface-immobilized lubricant interfaces for repellency under flow conditions.