TITLE

Biomimetic hierarchical structure for self-cleaning

AUTHOR(S)
Bhushan, Bharat; Koch, Kerstin; Yong Chae Jung
PUB. DATE
September 2008
SOURCE
Applied Physics Letters;9/1/2008, Vol. 93 Issue 9, p093101
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Hierarchical roughness is beneficial for superhydrophobicity. Surfaces with microstructure, nanostructure, and hierarchical structure were fabricated by replication of micropattern and self- assembly of hydrophobic alkanes. The fabrication technique used is a low cost two step process, which provides flexibility in the fabrication of a variety of hierarchical structures. Fabricated structures and surface chemistry mimic the hierarchical surfaces of superhydrophobic and self-cleaning plant surfaces. The influence of structure on superhydrophobicity at different length scales is demonstrated by the investigation of static contact angle, hysteresis and tilt angles, and propensity of air pocket formation as well as adhesive forces.
ACCESSION #
34360730

 

Related Articles

  • The moving contact line with weak viscosity effects - an application and evaluation of Shikhmurzaev�s model. Lindner-Silwester, T.; Schneider, W. // Acta Mechanica;May2005, Vol. 176 Issue 3/4, p245 

    A recently developed model of dynamic wetting (Shikhmurzaev [1]) is applied to the spreading of a liquid over a smooth solid surface in the limit of weak viscosity effects. In this model, experimentally observed deviations of the dynamic contact angle from the static one are attributed to...

  • Oil Water Flow Through Different Diameter Pipes: Similarities and Differences. Mandal, T. K.; Chakrabarti, D. P.; Das, G. // Chemical Engineering Research & Design: Transactions of the Inst;Aug2007, Vol. 85 Issue 8, p1123 

    A survey of the past literature shows that the studies on liquid�liquid flows have primarily been carried out in pipe diameters of 0.025 m or more and no significant influence of conduit size on flow patterns was reported. An interest is felt in the present work to extend the study to pipe...

  • Helical instability of a rotating viscous liquid jet. Kubitschek, J. P.; Weidman, P. D. // Physics of Fluids;Nov2007, Vol. 19 Issue 11, p114108 

    Vertical rotating viscous liquid jet experiments show a clear preference for helical instabilities that evolve from initially planar disturbances at large rotation rates for fixed fluid properties. The laboratory setup for the experiments described herein was chosen as the nearest earth-based...

  • Internal instability of thin liquid sheets. Rao, V. Nagabhushana; Ramamurthi, K. // Physics of Fluids;Sep2009, Vol. 21 Issue 9, p092106 

    Linear stability analysis of an inviscid liquid sheet with different velocity profiles across its thickness is reported. The velocity profiles for which there is a progressive increase or decrease in velocities between the two interfaces are demonstrated to be inherently unstable even in the...

  • Microscopic calculation of the sticking force for nanodrops on an inclined surface. Berim, Gersh O.; Ruckenstein, Eli // Journal of Chemical Physics;9/21/2008, Vol. 129 Issue 11, p114709 

    A two-dimensional nanodrop on a vertical rough solid surface is examined using a nonlocal density functional theory in the presence of gravity. The roughness is modeled either as a chemical inhomogeneity of the solid or as a result of the decoration with pillars of a smooth homogeneous surface....

  • Mixing properties of steady flow in thermocapillary driven droplets. Vainchtein, Dmitri L.; Widloski, John; Grigoriev, Roman O. // Physics of Fluids;Jun2007, Vol. 19 Issue 6, p067102 

    We consider mixing via chaotic advection in microdroplets suspended at the free surface of a liquid substrate and driven along a straight line using the thermocapillary effect. With the help of a model derived by Grigoriev [Phys. Fluids 17, 033601 (2005)] we show that the mixing properties of...

  • Existence of receding and advancing contact lines. Eggers, Jens // Physics of Fluids;Aug2005, Vol. 17 Issue 8, p082106 

    We study a solid plate plunging into or being withdrawn from a liquid bath to highlight the fundamental difference between the local behavior of an advancing or a receding contact line, respectively. It is assumed that the liquid partially wets the solid, making a finite contact angle in...

  • Surface tension and scaling of critical nuclei in diatomic and triatomic fluids. Napari, Ismo; Laaksonen, Ari // Journal of Chemical Physics;4/7/2007, Vol. 126 Issue 13, p134503 

    Density functional theory has been used to investigate surface tension and scaling of critical clusters in fluids consisting of diatomic and rigid triatomic molecules. The atomic sites are hard spheres with attractive interactions obtained from the tail part of the Lennard-Jones potential....

  • Electrochemically activated adaptive liquid lens. López, Carlos A.; Chin-Chen Lee; Hirsa, Amir H. // Applied Physics Letters;9/26/2005, Vol. 87 Issue 13, p134102 

    Manipulating the shape of liquids using surface tension is an important and useful strategy in designing small-scale fluidic devices. Here we present an example of such a device, a millimeter-scale variable focal length liquid lens consisting of two capillary surfaces. Surface tension is made to...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics