Directed rebounding of droplets by microscale surface roughness gradients

Malouin, Bernard A.; Koratkar, Nikhil A.; Hirsa, Amir H.; Zuankai Wang
June 2010
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p234103
Academic Journal
Impact dynamics of water droplets on superhydrophobic surfaces with different textures are known to vary dramatically, from total rebounding to complete sticking. Here we show that droplet rebounding on textured surfaces can be significantly influenced by the uniformity of the surface roughness. By engineering nonuniform textures (i.e., roughness gradients) on the surface, we are able to not only manipulate the axial rebound of the droplet, but also introduce a prescribed lateral component to the rebound trajectory. The measured directed rebounding is shown to fit a simple model balancing droplet inertia against the Young’s force imbalance from side to side.


Related Articles

  • A reliable method of manufacturing metallic hierarchical superhydrophobic surfaces. Pogreb, Roman; Gene Whyman; Barayev, Reuven; Bormashenko, Edward; Aurbach, Doron // Applied Physics Letters;6/1/2009, Vol. 94 Issue 22, p221902 

    A method of manufacturing hierarchical metallic surfaces demonstrating superhydrophobic properties is presented. The surfaces showed apparent contact angles as high as 153° and sliding angles of 10° for 50–100 μl droplets. The Cassie-like model [A. B. D. Cassie and S. Baxter,...

  • Fault Diagnosis in Lab-on-Chip Using Digital Microfluidic Logic Gates. Yang Zhao; Chakrabarty, Krishnendu // Journal of Electronic Testing;Feb2011, Vol. 27 Issue 1, p69 

    Fault diagnosis is needed for a lab-on-chip to facilitate defect tolerance using reconfiguration. Previously proposed techniques for reading test outcomes and for pulse-sequence analysis are cumbersome and error-prone. We present a fault-diagnosis method to locate a single defective cell and...

  • Sticky superhydrophobic surface. Guo, Zhi-Guang; Liu, Wei-Min // Applied Physics Letters;5/28/2007, Vol. 90 Issue 22, p223111 

    The authors present a simple and inexpensive method for fabricating a stable superhydrophobic engineering material surface using aluminum alloy and a suitable aqueous solution and time to control the surface roughness, which has a large water contact angle (>150°) and a large water sliding...

  • Observation of Stages of Homogeneous Nucleation of Liquid Droplets in Solid Isotopic Helium Mixtures. Poole, M.; Saunders, J.; Cowan, B. // AIP Conference Proceedings;2006, Vol. 850 Issue 1, p360 

    We have made simultaneous pressure and NMR measurements during the evolution of phase separation in solid helium isotopic mixtures. The experiments reported were performed at initial pressures and concentrations where the phase-separated 3He inclusions formed as liquid droplets. Our observations...

  • The Formation of Stable W/O, O/W, W/O/W Cosmetic Emulsions in an Ultrasonic Field. Tal-Figiel, B. // Chemical Engineering Research & Design: Transactions of the Inst;May2007, Vol. 85 Issue 5, p730 

    This paper presents basic research results for production of W/O, O/W and W/O/W cosmetic emulsions under ultrasonic irradiation. A technology for the continuous and batch treatment of fluid mixtures with ultrasound was characterized using cosmetic emulsions as model systems. If cavitation is the...

  • Superhydrophobicity: Drying transition of confined water. Seema Singh; Houston, Jack; van Swol, Frank; Brinker, C. Jeffrey // Nature;8/3/2006, Vol. 442 Issue 7102, p526 

    Long-range hydrophobic interactions operating underwater are important in the mediation of many natural and synthetic phenomena, such as protein folding, adhesion and colloid stability. Here we show that rough hydrophobic surfaces can experience attractive forces over distances more than 30...

  • Superhydrophobic spiral Co3O4 nanorod arrays. Guo, Zhi-guang; Liu, Wei-min // Applied Physics Letters;5/7/2007, Vol. 90 Issue 19, p193108 

    The authors report a facile method for the fabrication of a superhydrophobic surface with spiral Co3O4 nanorod arrays on a glass wafer plated Au. The resulting surface shows superhydrophobicity with a static contact angle of about (162±1.6)° and a sliding angle of around (5±2)°. This...

  • Droplets on inclined rough surfaces. Hyväluoma, J.; Koponen, A.; Raiskinmäki, P.; Timonen, J. // European Physical Journal E -- Soft Matter;Jul2007, Vol. 23 Issue 3, p289 

    The behaviour of liquid droplets on inclined heterogeneous surfaces was simulated by the lattice-Boltzmann method using the Shan-Chen multiphase model. The effect of topography of the surface on the contact angle hysteresis was investigated. It is shown in particular, by using anisotropic rough...

  • Imbibition of a liquid droplet on a deformable porous substrate. Anderson, Daniel M. // Physics of Fluids;Aug2005, Vol. 17 Issue 8, p087104 

    We consider the imbibition of a liquid droplet into a deformable porous substrate. The liquid in the droplet is imbibed due to capillary suction in an initially dry and undeformed substrate. Deformation of the substrate occurs as the liquid fills the pore space. In our model, a pressure gradient...


Read the Article


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

Try another library?
Sign out of this library

Other Topics