DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Ballistics of self-jumping microdroplets

Journal Article · · Physical Review Fluids
 [1];  [1];  [2];  [3];  [4];  [1];  [1]
  1. Physique et Mecanique des Milieux Heterogenes, Paris (France); Ecole Polytechnique, Palaiseau (France)
  2. Stony Brook Univ., Stony Brook, NY (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Indian Institute of Science Education and Research (IISER)-Pune, Maharashtra (India)

Water-repellent materials ideally operate at very different liquid scales: from centimeter-size for bugs living on ponds through millimeter-size for antirain functions to micrometer-size for antifogging solids. In the last situation, it was recently evidenced that microdrops condensing on a highly nonadhesive substrate can take advantage from coalescence to jump off the material, even if the dynamical characteristics of the jump were not established at such microscales. We demonstrate in this paper that the jumping speed of drops is nonmonotonic with the drop size, showing a maximum around 5μm (a size commonly observed in dew), below and above which viscous and inertial effects, respectively, impede the takeoff. We quantitatively describe this optimum in antifogging. Here, we also studied the ballistics of the jumping microdrops, from the height they reached to their behavior at landing; a situation where retakeoff is surprisingly found to be nearly unachievable despite the extreme nonwettability of the material.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-98CH10886; SC0012704
OSTI ID:
1496573
Report Number(s):
BNL-211289-2019-JAAM
Journal Information:
Physical Review Fluids, Journal Name: Physical Review Fluids Journal Issue: 1 Vol. 4; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (49)

Robust Superhydrophobicity in Large-Area Nanostructured Surfaces Defined by Block-Copolymer Self Assembly journal October 2013
Guided Self-Propelled Leaping of Droplets on a Micro-Anisotropic Superhydrophobic Surface journal March 2016
Guided Self-Propelled Leaping of Droplets on a Micro-Anisotropic Superhydrophobic Surface journal March 2016
Dry under water: Comparative morphology and functional aspects of air-retaining insect surfaces journal February 2011
Mass and momentum transfer on the small scale: how do mushrooms shed their spores? journal January 1991
Temperature relations and underwater endurance of the smallest homeothermic diver, the water shrew journal September 1969
Underwater breathing: the mechanics of plastron respiration journal July 2008
Self-propelled jumping upon drop coalescence on Leidenfrost surfaces journal July 2014
Numerical simulations of self-propelled jumping upon drop coalescence on non-wetting surfaces journal July 2014
Interaction between Air Bubbles and Superhydrophobic Surfaces in Aqueous Solutions journal February 2015
Enhanced Jumping-Droplet Departure journal November 2015
Coalescence-Induced Self-Propulsion of Droplets on Superomniphobic Surfaces journal August 2017
Tuning Superhydrophobic Nanostructures To Enhance Jumping-Droplet Condensation journal July 2017
Departure of Condensation Droplets on Superhydrophobic Surfaces journal February 2015
Inherently Superoleophobic Nanocomposite Coatings by Spray Atomization journal January 2009
How Coalescing Droplets Jump journal September 2014
Water-repellent legs of water striders journal November 2004
The hydrodynamics of water strider locomotion journal August 2003
Reducing the contact time of a bouncing drop journal November 2013
Electrostatic charging of jumping droplets journal September 2013
Antifogging abilities of model nanotextures journal February 2017
Self-cleaning surfaces — virtual realities journal May 2003
Low-friction flows of liquid at nanopatterned interfaces journal March 2003
Pancake bouncing on superhydrophobic surfaces journal June 2014
Coalescence-Induced Jumping of Multiple Condensate Droplets on Hierarchical Superhydrophobic Surfaces journal January 2016
Laminar drag reduction in microchannels using ultrahydrophobic surfaces journal December 2004
Size effect on the coalescence-induced self-propelled droplet journal January 2011
Planar jumping-drop thermal diodes journal December 2011
Experimental and numerical investigation of binary coalescence: Liquid bridge building and internal flow fields journal June 2012
Analysis of droplet jumping phenomenon with lattice Boltzmann simulation of droplet coalescence journal April 2013
Condensation and jumping relay of droplets on lotus leaf journal July 2013
Coalescence-induced jumping of nanoscale droplets on super-hydrophobic surfaces journal October 2015
Self-cleaning of superhydrophobic surfaces by self-propelled jumping condensate journal April 2013
Self-propulsion of dew drops on lotus leaves: a potential mechanism for self cleaning journal March 2014
The captured launch of a ballistospore journal September 2005
Removal mechanisms of dew via self-propulsion off the gecko skin journal April 2015
Asymmetric drop coalescence launches fungal ballistospores with directionality journal July 2017
Coalescence-induced nanodroplet jumping journal October 2016
Spontaneous Wenzel to Cassie dewetting transition on structured surfaces journal November 2016
How merging droplets jump off a superhydrophobic surface: Measurements and model journal November 2017
Self-Propelled Dropwise Condensate on Superhydrophobic Surfaces journal October 2009
Designing Superoleophobic Surfaces journal December 2007
WALKING ON WATER: Biolocomotion at the Interface journal January 2006
Surface tension propulsion of fungal spores journal August 2009
Spontaneous Wenzel to Cassie dewetting transition on structured surfaces text January 2016
The captured launch of a ballistospore journal July 2005
Condensation and jumping relay of droplets on lotus leaf text January 2013
Pancake bouncing on superhydrophobic surfaces text January 2014
Low Friction Flows of Liquids at Nanopatterned Interfaces text January 2003

Cited By (2)

Energy-based modeling of micro- and nano-droplet jumping upon coalescence on superhydrophobic surfaces journal September 2019
‘Sneezing’ plants: pathogen transport via jumping-droplet condensation journal June 2019