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Showing 1–18 of 18 results
Advanced filters: Author: Kripa K. Varanasi Clear advanced filters

  • There are many uses for surfaces that can stay dry, self-clean or resist icing, and many applications benefit from minimizing the contact time between a surface and any drops that may come into contact with it; drops are now shown to bounce off faster when using a superhydrophobic surface with a morphology that redistributes the liquid mass so that the centre of the drop assists in the recoil.

    • James C. Bird
    • Rajeev Dhiman
    • Kripa K. Varanasi
    Research
    Nature
    Volume: 503, P: 385-388

  • Controlling surface wettability using visible light is highly attractive for a range of liquid separation technologies. Here, Varanasi, McKinley and colleagues fabricate dye-sensitized photocatalytic TiO2surfaces on which liquid droplet motion can be externally manipulated by visible light illumination.

    • Gibum Kwon
    • Divya Panchanathan
    • Kripa K. Varanasi
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-8

  • The motion of liquid drops on surfaces is governed by adhesion forces, but the microscopic mechanism is unclear. Paxson et al. image the dynamic distortion of the edge of a droplet as it moves across a surface, allowing them to predict the wetting ability of different hierarchically textured surfaces.

    • Adam T. Paxson
    • Kripa K. Varanasi
    ResearchOpen Access
    Nature Communications
    Volume: 4, P: 1-8

  • Conventional electrochemical CO2 conversion electrodes are bound by a tradeoff which prevents electrodes from being both stable and scalable. Here the authors develop a composite electrode which achieves both, enabling scaling to a 50 cm2 electrode with low ohmic losses.

    • Simon Rufer
    • Michael P. Nitzsche
    • Kripa K. Varanasi
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-9

  • Metallic and ceramic surfaces can be rendered hydrophobic through a combination of multiscale surface structures and polymeric modifiers, but the imparted hydrophobicity is not robust to harsh environments. It is now shown that the lanthanide oxide series—a class of ceramics—is intrinsically hydrophobic as a result of their unique electronic structure, even after exposure to high temperatures and abrasive wear.

    • Gisele Azimi
    • Rajeev Dhiman
    • Kripa K. Varanasi
    Research
    Nature Materials
    Volume: 12, P: 315-320

  • When molten tin droplets impact clean substrates, they either stick or spontaneously detach depending on the substrate temperature. Competition between heat extraction and fluidity controls this behaviour, forgoing the need for surface treatment.

    • Jolet de Ruiter
    • Dan Soto
    • Kripa K. Varanasi
    Research
    Nature Physics
    Volume: 14, P: 35-39

  • The extensive use of pesticides in agriculture calls for efficient spraying techniques to reduce pollution of soils and groundwater by toxic chemicals. Damak et al. simultaneously spray liquids containing oppositely charged polyelectrolytes that form defects, pinning droplets on targeted surfaces.

    • Maher Damak
    • Md Nasim Hyder
    • Kripa K. Varanasi
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-9

  • Cooling hot surfaces by boiling water is widely practiced, but the amount of heat transfer is normally constrained by vapour layer formation at sufficiently high temperatures. Here, the authors report the maximum in the critical heat flux on textured hydrophilic surfaces at an intermediate texture density.

    • Navdeep Singh Dhillon
    • Jacopo Buongiorno
    • Kripa K. Varanasi
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-12

  • Emulsions—stabilized mixtures of immiscible liquids—are found in many products, ranging from pharmaceuticals to food. Here Guha et al. propose a simple emulsification method where water vapor is condensed onto oil with surfactant, producing a water-in-oil emulsion with droplets as small as 100 nm.

    • Ingrid F. Guha
    • Sushant Anand
    • Kripa K. Varanasi
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-7

  • A combination of hard, soft and nanoscale organic components results in robust superhydrophobic surfaces that can withstand mechanical abrasion and chemical oxidation, and exhibit excellent substrate adhesion.

    • Henri-Louis Girard
    • Sami Khan
    • Kripa K. Varanasi
    News & Views
    Nature Materials
    Volume: 17, P: 298-300