Electric Field Induced, Superhydrophobic to Superhydrophilic Switching in Multiwalled Carbon Nanotube Papers

Kakade, Bhalchandra; Mehta, Rutvik J.; Durge, Apurva; Kulkarni, Sneha A.; Pillai, Vijayamohanan K.

doi:10.1021/nl801012r

Cited by 117 publications

(94 citation statements)

References 19 publications

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“…Up to now, there are only some reports in the literatures about the electrowetting on superhydrophobic surfaces [149][150][151][152][153][154][155][156][157][158][159][160][161][162]. Krupenkin et al [154] demonstrated for the first time a method for dynamic electrical control over the wetting behavior of liquid droplets on superhydrophobic nanostructured surfaces by etching microscopic array of cylindrical nanoposts into the surface of a silicon wafer, finding that the wetting properties of the surface can be tuned from superhydrophobic behavior to nearly complete wetting as a function of applied voltage and liquid surface tension, with no reversible effect (Fig.…”

Section: Electrowettingmentioning

confidence: 99%

“…Anti-icing [138,13,[139][140][141][142] Super oil-repellent [143][144][145][146][147][148] Electrowetting [149][150][151][152][153][154][155][156][157][158][159][160][161][162] Responsive superhydrophobic surfaces [163,164,7,[165][166][167][168] Water droplet evaporation and condensation [169][170][171][172][173][174][175][176][177][178][179] Sticky and superhydrophobicity [180][181][182][183][184]…”

Section: Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Superhydrophobic surfaces: From natural to biomimetic to functional

Guo

Liu

2011

Journal of Colloid and Interface Science

883

513

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Section: Electrowettingmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Superhydrophobic surfaces: From natural to biomimetic to functional

Guo

Liu

2011

Journal of Colloid and Interface Science

883

513

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“…Various investigations have been conducted to examine the motion of a liquid droplet on a solid surface using external fi elds such as gravity, heat gradients [65,66], electric fi elds [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81], magnetic fi elds [82], photo-illumination [83], blowing wind [84] and vibration [85].…”

Section: Control Of Water Droplets On Solid Surfacesmentioning

confidence: 99%

“…A hydrophobic solid surface generally becomes hydrophilic upon application of an electric fi eld [67,68]. Electrowetting is a microfl uidic phenomenon that has grown explosively as a driving mechanism for various fl uidic and electro-optic applications [69][70][71][72][73].…”

Section: Control Of Water Droplets On Solid Surfacesmentioning

confidence: 99%

Design of hydrophobic surfaces for liquid droplet control

Nakajima

2011

NPG Asia Mater

141

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During rainfall, small water droplets can be observed to roll off hydrophobic umbrella surfaces at diff erent speeds. A droplet on a round hydrophobic surface does not always slide down on the surface easily at a small tilt angle, but even if it does, large moving acceleration is not always observed. What determines the motion of droplets on solid surfaces?Diff erences in droplet shape on solid surfaces are often explained by variations in wettability. Th e wetting of a solid surface has persisted through the ages as a research subject at the border between physics and chemistry. Wettability control of a solid against a liquid has been widely explored in industry for application in daily life because it can engender various physical and chemical phenomena related to solids and liquids. Wettability is an important property of solid surfaces from both fundamental and practical aspects. Th e degree of adhesion of liquid droplets onto a solid surface is commonly described in terms of the contact angle (θ), which is given by Young's equation aswhere γ sv , γ sl , and γ lv represent the interfacial free energies per unit area of the solid-gas, solid-liquid and liquid-gas interfaces. Although the defi nition and measurement of the contact angle are simple and easy, the nature of wettability is complex because it is related to three phases: solid, liquid and gas. Moreover, various factors aff ect the surface wettability of a solid. When one factor of a solid surface such as roughness is altered, other factors such as the surface topography or its chemical composition often change simultaneously. Th erefore, it is usually diffi cult to discuss the results of surface wettability obtained from experiments while retaining academic rigor. Th e main research interest for industrial materials is the behavior of millimeter-size droplets on a solid surface of more than a few centimeters in area. Th erefore, the discussion of wettability among samples with great diff erences in surface character is sometimes conducted with ignorance of the infl uence of other characteristics.Hydrophobic coatings are extremely important for wettability control. Th e coatings are anticipated for various industrial uses such as anti-wetting, anti-snow (or ice), anti-rust and reduced friction resistance by reducing solid-liquid interaction. Generally, a hydrophobic surface is one on which water forms a round droplet that is easily removed. Recent advances in probe microscopy and surface spectroscopy and the wider availability of such techniques have revealed that macroscopic surface hydrophobicity, especially dynamic hydrophobicity, is aff ected by nanolevel characteristics such as structure, chemical composition and their alignment and homogeneity. Th e expected properties for a hydrophobic surface cannot always be obtained unless precise design and control of the solid surface are applied. Th is report presents the results of recent studies on the design of hydrophobic surfaces for droplet removal or control from the viewpoint of materials science....

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“…Superhydrophobic surfaces have been applied in MEMS field especially in electrowetting research. Kakade et al [2] fabricated superhydrophobic multiwalled carbon nanotube bucky paper showing fascinating electrowetting behavior. The droplet behavior can be reversibly switched between superhydrophobic Cassie-Baxter state to hydrophilic Wenzel state by the application of an electric field, especially below a threshold value.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Novel Superhydrophobic Surfaces and Water Droplet Bouncing Behavior — Part 1: Stable ZnO–PDMS Superhydrophobic Surface with Low Hysteresis Constructed Using ZnO Nanoparticles

Wang

Feng

Zhao

et al. 2010

Journal of Adhesion Science and Technology

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A superhydrophobic surface has many advantages in micro/nanomechanical applications, such as low adhesion, low friction and high restitution coefficient, etc. In this paper, we introduce a novel and simple route to fabricate superhydrophobic surfaces using ZnO nanocrystals. First, tetrapod-like ZnO nanocrystals were prepared via a one-step, direct chemical vapor deposition (CVD) approach. The nanostructured ZnO material was characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD) and the surface functionalized by aminopropyltriethoxysilane (APS) was found to be hydrophobic. Then the superhydrophobic surface was constructed by depositing uniformly ZnO hydrophobic nanoparticles (HNPs) on the Poly(dimethylsiloxane) (PDMS) film substrate. Water wettability study revealed a contact angle of 155.4 ± 2 • for the superhydrophobic surface while about 110 • for pure smooth PDMS films. The hysteresis was quite low, only 3.1 ± 0.3 • . Microscopic observations showed that the surface was covered by microand nano-scale ZnO particles. Compared to other approaches, this method is rather convenient and can be used to obtain a large area superhydrophobic surface. The high contact angle and low hysteresis could be attributed to the micro/nano structures of ZnO material; besides, the superhydrophobic property of the as-constructed ZnO-PDMS surface could be maintained for at least 6 months.

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Electric Field Induced, Superhydrophobic to Superhydrophilic Switching in Multiwalled Carbon Nanotube Papers

Cited by 117 publications

References 19 publications

Superhydrophobic surfaces: From natural to biomimetic to functional

Superhydrophobic surfaces: From natural to biomimetic to functional

Design of hydrophobic surfaces for liquid droplet control

Fabrication of Novel Superhydrophobic Surfaces and Water Droplet Bouncing Behavior — Part 1: Stable ZnO–PDMS Superhydrophobic Surface with Low Hysteresis Constructed Using ZnO Nanoparticles

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