The Influence of Structure Heights and Opening Angles of Micro- and Nanocones on the Macroscopic Surface Wetting Properties

Schneider, Ling; Laustsen, Milan; Mandsberg, Nikolaj Kofoed; Taboryski, Rafael J.

doi:10.1038/srep21400

Cited by 54 publications

(63 citation statements)

References 46 publications

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“…For the master structure, we use a Si nanograss texture. 26 The nanograss was originated in Si by reactive ion etching (RIE). RIE can be used for maskless texturing of silicon surfaces through the combined effect of a corrosive gas (SF 6 and/or CH 4 ) and a passivating gas (O 2 ).…”

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confidence: 99%

“…On the microscopic level, the wetting of such surfaces can be characterized according to the degree of water intrusion into the structures. 26,43,44 The data in Figure 3c indicate a transition to an enhanced dewetting state roughly at = 325 nm. In a previous publication we found that the wetting properties for superhydrophobic surfaces with cone shaped structure depends on the opening angles of cones, rather than their heights.…”

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confidence: 99%

“…In a previous publication we found that the wetting properties for superhydrophobic surfaces with cone shaped structure depends on the opening angles of cones, rather than their heights. 26 However, when cones get stretched, their opening angle decreases. This is shown in Figure 4, where we plot the average opening angle of the structure as a function of the values obtained as a result of different roller line-speeds.…”

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confidence: 99%

“…40 In the CB state, sessile droplets will roll off a superhydrophobic surface for only a small tilt angle . 26 Low roll-off angles thus provide a practical measure of the self-cleaning properties of the material. 15,41 In the Cassie-Baxter model, the apparent WCA ( ) can be expressed by where > 1 is the ratio of the real surface area to the projected surface area, and is the Young CA for the unstructured foil surface given above.…”

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Superhydrophobic Properties of Nanotextured Polypropylene Foils Fabricated by Roll-to-Roll Extrusion Coating

et al. 2016

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We demonstrate the use of roll-to-roll extrusion coating (R2R-EC) for fabrication of nanopatterned polypropylene (PP) foils with strong antiwetting properties. The antiwetting nanopattern is originated from textured surfaces fabricated on silicon wafers by a single-step method of reactive ion etching with different processing gas flow rates. We provide a systematic study of the wetting properties for the fabricated surfaces and show that a controlled texture stretching effect in the R2R-EC process is instrumental to yield the superhydrophobic surfaces with water contact angles approaching 160° and droplet roll-off angles below 10°.

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Superhydrophobic Properties of Nanotextured Polypropylene Foils Fabricated by Roll-to-Roll Extrusion Coating

et al. 2016

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“…The structures are produced by reactive ion etching (RIE) through the combined effect of an etching gas (SF 6 and/or CH 4 ) and a passivating gas (O 2 ) [44][45][46]. Hitherto, no investigation has been carried out with RIE for the creation of large-area nanostructures within microchannel.…”

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<strong>ELECTROOSMOTIC FLOW IN MICROCHANNEL WITH </strong><strong>BLACK SILICON NANOSTRUCTURES</strong>

Lim

Lam

et al. 2017

Proceedings of the 7th International Multidisciplinary Conference on Optofluidics 2017

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Abstract:Although electroosmotic flow (EOF) has been applied to drive fluid flow in microfluidic chips, some of the phenomena associated with it can adversely affect the performance of certain applications such as electrophoresis and ion preconcentration. To minimize the undesirable effects, EOF can be suppressed by polymer coatings or introduction of nanostructures. In this work, we presented a novel technique that employs the Dry Etching, Electroplating and Molding (DEEMO) process along with reactive ion etching (RIE), to fabricate microchannel with black silicon nanostructures (prolate hemispheroid-like structures). The effect of black silicon nanostructures on EOF was examined experimentally by current monitoring method, and numerically by finite element simulations. The experimental results showed that the EOF velocity was reduced by 13 ± 7%, which is reasonably close to the simulation results that predict a reduction of approximately 8%. EOF reduction is caused by the distortion of local electric field at the nanostructured surface. Numerical simulations show that the EOF velocity decreases with increasing nanostructure height or decreasing diameter. This reveals the potential of tuning the etching process parameters to generate nanostructures for better EOF suppression. The outcome of this investigation enhances the fundamental understanding of EOF behavior, with implications on the precise EOF control in devices utilizing nanostructured surfaces for chemical and biological analyses.

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CART: Carrier‐Based Actuatable and Reprogrammable Transport

Mandsberg,

Serna,

Levkin

2024

Adv Funct Materials

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Remote manipulation of microcargo is essential for miniaturized automated experiments in fields such as biology, chemistry, and diagnostics, allowing efficient use of scarce, expensive, or hazardous materials. Current methods for manipulating microcargo are generally limited to droplets as cargo and rely on reduced substrate‐cargo friction and special substrate‐cargo interactions (electrowetting, anisotropic wetting, water‐repellency, etc.) to enable cargo mobility. This limits the versatility of substrate and cargo choice. Here, CART (Carrier‐based Actuatable and Reprogrammable Transport) is presented as a solution to these challenges. By introducing a carrier between the substrate and the cargo, CART physically separates them, eliminating the need to reduce substrate‐cargo friction and the need for substrate‐cargo matching. CART devices are easy to realize, tailor, and post‐functionalize. A photo‐polymerizable phase‐separating resin is used to 3D‐print porous carriers that are then infused with ferrofluid to make them magnetically responsive, enabling untethered cargo manipulation on both solid and liquid substrates. Using CART, various cargos can be remotely moved, rotated/mixed, inverted, and lifted, further facilitating interaction between two carriers for transferring, merging, and tunably splitting cargo. Overall, CART advances microcargo manipulation by decoupling cargo from the substrate and leveraging magnetic responsiveness for untethered, versatile control across different environments, opening up new actuation‐modalities.

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The Influence of Structure Heights and Opening Angles of Micro- and Nanocones on the Macroscopic Surface Wetting Properties

Cited by 54 publications

References 46 publications

Superhydrophobic Properties of Nanotextured Polypropylene Foils Fabricated by Roll-to-Roll Extrusion Coating

Superhydrophobic Properties of Nanotextured Polypropylene Foils Fabricated by Roll-to-Roll Extrusion Coating

<strong>ELECTROOSMOTIC FLOW IN MICROCHANNEL WITH </strong><strong>BLACK SILICON NANOSTRUCTURES</strong>

CART: Carrier‐Based Actuatable and Reprogrammable Transport

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