Doubly Reentrant Pillars
Doubly Reentrant Pillars - Related Videos
08:02
Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Cited by 17 •
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This work presents microfabrication protocols for achieving cavities and pillars with reentrant and doubly reentrant profiles on SiO2/Si wafers using photolithography and dry etching. Resulting microtextured surfaces demonstrate remarkable liquid repellence, characterized by robust long-term entrapment of air under wetting liquids, despite the intrinsic wettability of silica.
07:19
Protocol for Biofilm Streamer Formation in a Microfluidic Device with Micro-pillars
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Cited by 17 •
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Protocols for the study of biofilm formation in a microfluidic device that mimics porous media are discussed. The microfluidic device consists of an array of micro-pillars and biofilm formation by Pseudomonas fluorescens in this device is investigated.
12:56
Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)
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Cited by 2 •
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A combination of three single wavelength short-pulsed lasers is used to generate coherent anti-Stokes Raman scattering (CARS) and doubly-resonant CARS (DR-CARS). The difference between these signals provides enhanced sensitivity for otherwise difficult to detect coherent Raman signals, enabling imaging of weak Raman scatterers.
05:32
A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars
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Cited by 7 •
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A protocol for fabricating injection molding inserts for complex geometry with micro features on surfaces employing Additive Manufacturing (AM) is presented.
11:20
Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry
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Cited by 4 •
2014
A procedure for creating and imaging capillary bridges in slit-pore geometry is presented. The creation of capillary bridges relies on the formation of pillars to provide a directional physical and chemical heterogeneity to pin the fluid. Capillary bridges are formed and manipulated using microstages and visualized using a CCD camera.
FAQs
The upper and lower inward-curving regions provide geometric resistance at both ends of each pillar, helping oppose liquid penetration into the textured structure. This support becomes important when surface tension or external pressure would otherwise distort the solid-liquid-air interface. By limiting penetration, the geometry can reduce spreading and lessen the likelihood that droplets become trapped within the array.
Pillar dimensions, spacing, material properties, and the wetting conditions of the contacting liquid collectively determine performance. Changing the dimensions or separation alters how much of the interface is supported by the structure, while material properties and liquid wetting behavior affect the interaction at the solid surface. These variables therefore need to be considered together rather than optimized independently.
External pressure can challenge the liquid interface by promoting deformation or penetration into the pillar array. The doubly reentrant geometry is valuable because its opposing overhangs help resist that tendency, complementing the stabilizing effect of surface tension. Testing under relevant pressure conditions can therefore reveal whether a design maintains liquid repellency or begins to lose its intended interfacial behavior.
Evaluation should relate the pillar dimensions and spacing to the material properties and the wetting conditions of the target liquid. Engineers can then consider whether the geometry is likely to oppose penetration, limit spreading, and avoid droplet trapping under the expected surface-tension and pressure conditions. This design-focused comparison helps match a pillar array to its intended operating environment.
These structures support the development of superomniphobic and liquid-repellent surfaces for several engineering uses. Relevant areas include microfluidics, anti-fouling coatings, condensation management, and self-cleaning technologies. In each case, the array can be selected or tuned to manage how a contacting liquid interacts with the surface, while performance remains dependent on geometry, materials, and wetting conditions.
Their contribution comes from controlling droplet interaction with the engineered surface. By opposing liquid penetration and reducing spreading or trapping, the pillar array can support liquid-repellent behavior relevant to condensation management and self-cleaning designs. The practical outcome depends on whether the selected dimensions, spacing, material properties, and liquid wetting conditions preserve the desired interface during use.