Bioinspired Designs of Superhydrophobic and Superhydrophilic Materials

Si, Ying; Dong, Zhichao; Jiang, Lei

doi:10.1021/acscentsci.8b00504

Cited by 375 publications

(227 citation statements)

References 118 publications

(291 reference statements)

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“…arch-shaped peristome, water will transport at an even higher speed (Movie S1). As a hypothesis, in addition to the surface microstructures (7,(26)(27)(28), the curvatures of the microscale channel and the arch-shaped peristome surface (SI Appendix, Fig. S1) should influence water transport dynamics.…”

Section: Resultsmentioning

confidence: 99%

Bioinspired inner microstructured tube controlled capillary rise

Dai

Gao

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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117

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Effective, long-range, and self-propelled water elevation and transport are important in industrial, medical, and agricultural applications. Although research has grown rapidly, existing methods for water film elevation are still limited. Scaling up for practical applications in an energy-efficient way remains a challenge. Inspired by the continuous water cross-boundary transport on the peristome surface of Nepenthes alata, here we demonstrate the use of peristome-mimetic structures for controlled water elevation by bending biomimetic plates into tubes. The fabricated structures have unique advantages beyond those of natural pitcher plants: bulk water diode transport behavior is achieved with a high-speed passing state (several centimeters per second on a milliliter scale) and a gating state as a result of the synergistic effect between peristomemimetic structures and tube curvature without external energy input. Significantly, on further bending the peristome-mimetic tube into a "candy cane"-shaped pipe, a self-siphon with liquid diode behavior is achieved. Such a transport mechanism should inspire the design of next generation water transport devices. biomimetic | capillary rise | diode | siphon | water transport

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Section: Resultsmentioning

confidence: 99%

Bioinspired inner microstructured tube controlled capillary rise

Dai

Gao

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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117

102

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“…According to Young's equation, a CA of 90° is considered a traditional boundary between hydrophilicity and hydrophobicity . However, some researchers believe a CA of 65° should be used, and a surface is defined as hydrophilic when the water contact angle (WCA) is less than 65° and hydrophobic when the CA is more than 65° . The main reason for the disagreement is that the water molecules on the surface of a liquid are not truly the same as those in the bulk phases.…”

Section: Interaction Between Surface and Liquidmentioning

confidence: 99%

“…[138,139] However, some researchers believe a CA of 65° should be used, and a surface is defined as hydrophilic when the water contact angle (WCA) is less than 65° and hydrophobic when the CA is more than 65°. [140,141] The main reason for the disagreement is that the water molecules on the surface of a liquid are not truly the same as those in the bulk phases. Actually, the structure and activity of the interfacial water molecules are considerably different from those in the bulk water, which should be taken into account.…”

Section: Theoretical Modelsmentioning

confidence: 99%

Micro‐/Nanostructured Interface for Liquid Manipulation and Its Applications

Duan

Zheng

Zhao

et al. 2019

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Understanding the relationship between liquid manipulation and micro‐/nanostructured interfaces has gained much attention due to the wide potential applications in many fields, such as chemical and biomedical assays, environmental protection, industry, and even daily life. Much work has been done to construct various materials with interfacial liquid manipulation abilities, leading to a range of interesting applications. Herein, different fabrication methods from the top‐down approach to the bottom‐up approach and subsequent surface modifications of micro‐/nanostructured interfaces are first introduced. Then, interactions between the surface and liquid, including liquid wetting, liquid transportation, and a number of corresponding models, together with the definition of hydrophilic/hydrophobic, oleophilic/olephobic, the definition and mechanism of superwetting, including superhydrophobicity, superhydrophilicity, and superoleophobicity, are presented. The micro‐/nanostructured interface, with major applications in self‐cleaning, antifogging, anti‐icing, anticorrosion, drag‐reduction, oil–water separation, water collection, droplet (micro)array, and surface‐directed liquid transport, is summarized, and the mechanisms underlying each application are discussed. Finally, the remaining challenges and future perspectives in this area are included.

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“…Superhydrophobic surfaces are the best choice in these applications due to their superior self‐cleaning and antifouling ability for repelling the deposition of other materials and liquid confining properties for enhancing printing resolution and avoiding coffee‐ring effects . However, inertial water drops impacting superhydrophobic surfaces can bounce off quickly or splash violently . Undesired rebound and splash cause material waste and weaken the related performance and efficiency.…”

mentioning

confidence: 99%

Uniform Spread of High‐Speed Drops on Superhydrophobic Surface by Live‐Oligomeric Surfactant Jamming

et al. 2019

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self-cleaning and antifouling ability for repelling the deposition of other materials and liquid confining properties for enhancing printing resolution and avoiding coffee-ring effects. [13] However, inertial water drops impacting superhydrophobic surfaces can bounce off quickly or splash violently. [14][15][16][17][18][19][20][21][22][23] Undesired rebound and splash cause material waste [24] and weaken the related performance and efficiency. Many attempts have been conducted to promote water drop spreading on hydrophobic surfaces by using polymers [1,23,[25][26][27][28] or surfactants. [22,[29][30][31][32] However, these two methods still have drawbacks for achieving drop deposition, not to mention uniform spreading: 1) Polymer additives can delay drop retraction but leave drops with hemispherical shape and nonuniform material distribution on the hydrophobic substrate.2) The poor wettability and large mole cular weight of polymer additives restrict the ejecting process during inkjet printing. 3) Surfactant additives can promote drop spreading in a static state owing to the reduced surface tension (γ); [33] however, the low surface tension increases the instability of the impacting drop and leads to drop splashing with satellite droplets, according to the Kelvin-Helmholtz instability, [34] k max ∼ 2ρ a U r 2 /3γ (ρ a is the air density). It is therefore a great challenge for uniform shape spreading on superhydrophobic surfaces without any loss of the drops. Here, we show a new and simple strategy for uniform round-shape drop spreading on superhydrophobic surfaces after high-speed impact, up to 5.0 m s −1 , by utilizing live-oligomeric surfactant jamming, diethylenetriamine/sodium dodecyl sulfate (triamine/SDS). The live-oligomeric surfactant, which noncovalently constructed by SDS and triamine through electrostatic interaction, has a dynamic equilibrium between monomer surfactant and oligomeric surfactant. Figure 1 shows the contrast spread dynamics of a liveoligomeric surfactant drop and other drops impacting superhydrophobic surfaces at an impacting velocity (U ) of 2.42 m s −1 from side and bottom views (Movie S1, Supporting Information). The diameter (D 0 ) of pure water and the surfactant drops is ≈2.25 and 1.90-2.00 mm, respectively (Figure S1, Supporting Information for experimental setup). The Weber number (We), We = ρDV 2 /γ, of water, SDS, N2C3/SDS, triamine/SDS, and 12-3-12-3-12 is 182. 68, 295.29, 358.29, 383.00, and 292.29, respectively. The superhydrophobic surface [35] composed of random micro-nanostructures of typical size and spacing of Inkjet printing of water-based inks on superhydrophobic surfaces is important in high-resolution bioarray detection, chemical analysis, and highperformance electronic circuits and devices. Obtaining uniform spreading of a drop on a superhydrophobic surface is still a challenge. Uniform round drop spreading and high-resolution inkjet printing patterns are demonstrated on superhydrophobic surfaces without splash or rebound after high-speed impacting by introducing...

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Bioinspired Designs of Superhydrophobic and Superhydrophilic Materials

Cited by 375 publications

References 118 publications

Bioinspired inner microstructured tube controlled capillary rise

Bioinspired inner microstructured tube controlled capillary rise

Micro‐/Nanostructured Interface for Liquid Manipulation and Its Applications

Uniform Spread of High‐Speed Drops on Superhydrophobic Surface by Live‐Oligomeric Surfactant Jamming

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