Ultra-water-repellent surface: fabrication of complicated structure of SiO2 nanoparticles by electrostatic self-assembled films

Soeno, Takuji; Inokuchi, K; Shiratori, Seimei

doi:10.1016/s0169-4332(04)00986-9

Cited by 82 publications

(36 citation statements)

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“…A decrease in interfacial tension is also seen by a decrease in the contact angle of a water droplet at a hydrophobic surface with the addition of alcohol. 27 The interfacial tension of the alcohol mixtures is different at a given alcohol concentration with aqueous methanol having the highest interfacial tension and aqueous propanol having the lowest interfacial tension. An interesting observation is that at low concentrations, the 1-propanol mixture has a lower interfacial tension than the 2-propanol mixture.…”

Section: Resultsmentioning

confidence: 99%

“…26 Water-alcohol mixtures at a hydrophobic surface have only been studied for contact angle or structure of droplets. [27][28][29] Interaction between small hydrophobic molecules (like methane) in a mixture of water and ethanol was studied. 30 These studies show that ethanol at low concentration stabilizes the structure of water around the hydrophobic methane and the strength of hydrophobic interaction decreases with increasing alcohol concentration.…”

Section: Introductionmentioning

confidence: 99%

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Hydrophobic and hydrophilic interactions in aqueous mixtures of alcohols at a hydrophobic surface

Ballal

Chapman

2013

The Journal of Chemical Physics

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Aqueous solutions of alcohols are interesting because of their anomalous behavior that is believed to be due to the molecular structuring of water and alcohol around each other in solution. The interfacial structuring and properties are significant for application in alcohol purification processes and biomolecular structure. Here we study aqueous mixtures of short alcohols (methanol, ethanol, 1-propanol, and 2-propanol) at a hydrophobic surface using interfacial statistical associating fluid theory which is a perturbation density functional theory. The addition of a small amount of alcohol decreases the interfacial tension of water drastically. This trend in interfacial tension can be explained by the structure of water and alcohol next to the surface. The hydrophobic group of an added alcohol preferentially goes to the surface preserving the structure of water in the bulk. For a given bulk alcohol concentration, water mixed with the different alcohols has different interfacial tensions with propanol having a lower interfacial tension than methanol and ethanol. 2-propanol is not as effective in decreasing the interfacial tension as 1-propanol because it partitions poorly to the surface due to its larger excluded volume. But for a given surface alcohol mole fraction, all the alcohol mixtures give similar values for interfacial tension. For separation of alcohol from water, methods that take advantage of the high surface mole fraction of alcohol have advantages compared to separation using the vapor in equilibrium with a water-alcohol liquid. © 2013 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrophobic and hydrophilic interactions in aqueous mixtures of alcohols at a hydrophobic surface

Ballal

Chapman

2013

The Journal of Chemical Physics

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“…Recently, the use of the LbL technique for constructing superhydrophobic coatings has been explored. [9][10][11][12] Shiratori and co-workers [9] first constructed multilayered films containing SiO 2 nanoparticles, which were further heated to 650°C to develop an inorganic nanostructure for superhydrophobic behavior. Zhang and co-workers [10] reported the use of polyelectrolyte multilayers as a matrix for electrochemical deposition to adjust the topography of gold and silver clusters, leading to superhydrophobic surfaces.…”

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confidence: 99%

Fabrication of a Superhydrophobic Surface from the Amplified Exponential Growth of a Multilayer

2006

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Superhydrophobic surfaces have received much attention due to their novel aspects of surface physics and important applications ranging from self-cleaning materials to microfluidic devices. Taking their inspiration from the self-cleaning property of lotus leaves [1] and insects, [2] the biomimetic results reveal that the synergistic interaction of the hierarchical micro-and nanostructure can not only improve the surface hydrophobicity but also reduce the sliding angle (SA), which is crucial to the self-cleaning properties of these surfaces.[3] Many efforts, including electrodeposition, polymer-phase separation, sol-gel methods, and others have been carried out to develop hierarchical micro-and nanostructures to obtain superhydrophobic surfaces. [4][5][6] Layer-by-layer self-assembly (LbL), which is based on the alternating physisorption of oppositely charged building blocks, represents a method to immobilize polyelectrolytes, colloid nanoparticles, and biomacromolecules, such as enzymes, extracellular matrices (ECM), DNA, etc. [7][8] The sensitivity of the LbL multilayer towards its environment (pH, ionic strength, etc.) further provides new approaches to adjust the layered nanostructure with a tailored composition and architecture. Recently, the use of the LbL technique for constructing superhydrophobic coatings has been explored. [9][10][11][12] Shiratori and co-workers [9] first constructed multilayered films containing SiO 2 nanoparticles, which were further heated to 650°C to develop an inorganic nanostructure for superhydrophobic behavior. Zhang and co-workers [10] reported the use of polyelectrolyte multilayers as a matrix for electrochemical deposition to adjust the topography of gold and silver clusters, leading to superhydrophobic surfaces. Rubner and co-workers [11] mimicked the superhydrophobic behavior of the lotusleaf structure by creating a microporous polyelectrolyte multilayer surface over-coated with silica nanoparticles. Schlenoff and co-workers [12] created an ultrahydrophobic surface roughening on both the micrometer and nanometer scale using layer-by-layer deposition of clay and fluorinated polyelectrolytes. Most of these methods, however, developed hierarchical micro-and nanostructures by combining the multiple assembly steps and different self-assembling building blocks, such as polyelectrolytes, metals, and nanoparticles. Herein, we report the amplified exponential growth of a multilayer of polyelectrolytes as a facile method to construct hierarchical micro-and nanostructures simultaneously, which can be further transformed into superhydropobic surfaces. The 3-aminopropyltriethoxysilane-coated substrates were alternately immersed in an aqueous solution of poly(acrylic acid) (PAA, 3 mg mL -1

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“…Furthermore, the absorption of water on metal-oxide surfaces is an important subject in its own right, due to its crucial role in gas sensors, catalysis, photochemistry and electrochemistry. It is well known that the measurement of the water contact angle (WCA) could reveal much useful information about characteristics of surface nanostructure and morphology [12]. However, there have been few studies of the surface wettability of the transparent conducting oxide ZnO nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Photon-induced tunable and reversible wettability of pulsed laser deposited W-doped ZnO nanorods

Ngom

Sakho

Ndiaye

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. ZnO nanorods arrays were prepared on soda lime glass substrate by pulsed laser deposition method. Hexagonal rod-like ZnO rods were obtained under different conditions. Well-defined ZnO nanorods arrays were selected among different samples having various morphologies and sizes already studied by X-ray diffraction (XRD) and atomic force microscopy (AFM). Here, we report on the contact angle measurement (CAM) of one of these samples. A systematic change of the surface wettability is observed in W-doped ZnO nanostructures. The water contact angle (WCA) of a 1 wt.% of WO 3 target content was found to be the transition doping level from hydrophilic surface to a hydrophobic surface. We attributed the transition in surface wettability of the film with the doping to incorporation increase of tungsten into the film. Such characteristic surface wettability can play a key role in the adhesion of various layers on W-ZnO nanorods arrays for optoelectronic device applications.

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Ultra-water-repellent surface: fabrication of complicated structure of SiO2 nanoparticles by electrostatic self-assembled films

Cited by 82 publications

References 0 publications

Hydrophobic and hydrophilic interactions in aqueous mixtures of alcohols at a hydrophobic surface

Hydrophobic and hydrophilic interactions in aqueous mixtures of alcohols at a hydrophobic surface

Fabrication of a Superhydrophobic Surface from the Amplified Exponential Growth of a Multilayer

Photon-induced tunable and reversible wettability of pulsed laser deposited W-doped ZnO nanorods

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