Tunable superomniphobic surfaces for sorting droplets by surface tension.

  title={Tunable superomniphobic surfaces for sorting droplets by surface tension.},
  author={Sanli Movafaghi and W. Wang and A Metzger and Desiree D. Williams and J. D. Williams and Arun Kumar Kota},
  journal={Lab on a chip},
  volume={16 17},
We utilized tunable superomniphobic surfaces with flower-like TiO2 nanostructures to fabricate a simple device with precisely tailored surface energy domains that, for the first time, can sort droplets by surface tension. We envision that our methodology for droplet sorting will enable inexpensive and energy-efficient analytical devices for personalized point-of-care diagnostic platforms, lab-on-a-chip systems, biochemical assays and biosensors. 
Fabrication of Nanostructured Omniphobic and Superomniphobic Surfaces with Inexpensive CO2 Laser Engraver.
It is demonstrated that the nanostructured omniphobic and superomniphobic surfaces fabricated using the laser texturing technique can be used to design patterned surfaces, surfaces with discrete domains of the desired wettability, and on-surface microfluidic devices.
Metamorphic Superomniphobic Surfaces
It is envisioned that the robust MorphS surfaces with reversible wetting transition will have a wide range of applications including rewritable liquid patterns, controlled drug release systems, lab-on-a-chip devices, and biosensors.
Tunable superamphiphobic surfaces: a platform for naked-eye ATP detection
A developed biosensor methodology based on droplet sorting ability of the fabricated surface is energy-efficient and economical which is promising for biosensors, point-of-care testing, and biochemical assays.
Metallic superhydrophobic surfaces via thermal sensitization
Superhydrophobic surfaces (i.e., surfaces extremely repellent to water) allow water droplets to bead up and easily roll off from the surface. While a few methods have been developed to fabricate
Sorting Liquid Droplets by Surface Tension Using Devices with Quasi-Superamphiphobic Coatings
A correlation between ethanol content/surface tension and rolling time/distance is found, so the same device is used to estimate the alcoholic strength of Chinese liquors and to predict the surface tension of ethanol aqueous solutions.
Superomniphobic Surfaces with Improved Mechanical Durability: Synergy of Hierarchical Texture and Mechanical Interlocking
A two-layer design strategy was developed to fabricate superomniphobic surfaces with improved durability via synergistic effect of interconnected hierarchical porous texture and micro/nano-mechanical interlocking.
Robust Super-Amphiphobic Titanium Surface for Liquid/Liquid Mini Separations
Super-amphiphobic surface with low robustness is not suitable for practical application due to its weak mechanical strength. In this work, an in-site growth of micro-/nanoscale flower-like TiO2 on
Superomniphobic Papers for On‐Paper pH Sensors
Paper‐based superomniphobic surfaces are of great interest because paper is flexible, inexpensive, lightweight, breathable, and recyclable. Prior reports on paper‐based superomniphobic surfaces have
Coalescence-Induced Self-Propulsion of Droplets on Superomniphobic Surfaces.
We utilized superomniphobic surfaces to systematically investigate the different regimes of coalescence-induced self-propulsion of liquid droplets with a wide range of droplet radii, viscosities, and
Surface Tension Sensor Meshes for Rapid Alcohol Quantification.
Results from testing commercial wines are presented along with the fabrication of electrospun two-layer polymeric sensor arrays, which exhibit controlled wettability.


Nanonails: a simple geometrical approach to electrically tunable superlyophobic surfaces.
In this work, dynamically tunable, superlyophobic surfaces capable of undergoing a transition from profound superlyophobic behavior to almost complete wetting have been demonstrated for the first
Invisible Gates for Moving Water Droplets: Adhesive Force Gradients on a Biomimetic Superhydrophobic Surface
On a hybrid surface, a gradient in the areal number density of metal domes generates an adhesive force gradient (AFG) that divides the surface into areas of water droplet sliding and adhesion. We
Application of superhydrophobic surface with high adhesive force in no lost transport of superparamagnetic microdroplet.
A simple, high-efficiency, and flexible method for reversibly oriented transport of superparamagnetic microdroplets with no lost volume by alternating magnetic fields to help for many localized chemical or biological reactions, traced analysis, and in situ detection.
Rebounding Droplet‐Droplet Collisions on Superhydrophobic Surfaces: from the Phenomenon to Droplet Logic
By the controlled coalescence of reactive droplets, here using the quenching of fluorescent metal nanoclusters as a model reaction, this work presents elementary Boolean logic operations and a flip-flop memory based on these rebounding water droplets.
Super-hydrophobic and super-wetting surfaces: Analytical potential?
Roughening or texturing surfaces provides super-liquid repellent or film forming properties without alteration of the surface chemistry. These surfaces are easy to produce, can amplify wetting
Hierarchically Structured Superoleophobic Surfaces with Ultralow Contact Angle Hysteresis
Hierarchically structured, superoleophobic surfaces are demonstrated that display one of the lowest contact angle hysteresis values ever reported - even with extremely low-surface-tension liquids
Designing Superoleophobic Surfaces
It is shown how a third factor, re-entrant surface curvature, in conjunction with chemical composition and roughened texture, can be used to design surfaces that display extreme resistance to wetting from a number of liquids with low surface tension, including alkanes such as decane and octane.
Light-induced amphiphilic surfaces
The ability to control the surface wettability of solid substrates is important in many situations. Here we report the photogeneration of a highly amphiphilic (both hydrophilic and oleophilic)
Robust omniphobic surfaces
Four design parameters are proposed that predict the measured contact angles for a liquid droplet on a textured surface, as well as the robustness of the composite interface, based on the properties of the solid surface and the contacting liquid, that allow two different families of re-entrant surfaces to be produced.