Fabrication of Superhydrophobic Surfaces of <i>n</i>-Hexatriacontane

Tavana, Hossein; Amirfazli, A.; Aw, Neumann

doi:10.1021/la0607757

Cited by 102 publications

(63 citation statements)

References 22 publications

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“…These values are comparable with the reported solid fraction values belonging to other disordered microstructures, for example, the results of Tavana et al [37] on thermal evaporated polymer (C36H74) surface or Wang et al [26] on branch-like structures of gold, resulting from galvanic exchange reaction. In the experiment of Tavana et al [37], the samples have suitable roughness for AFM studies, and the experimentally achieved solid fraction was reported to be ∼0.12. Our samples are highly rough and therefore inappropriate for AFM measurements to determine the f value experimentally.…”

Section: MM (B) 2475 Mm and (C) 396 Mm Respectively; And (D) A Magsupporting

confidence: 90%

Superhydrophobic properties of silver-coated films on copper surface by galvanic exchange reaction

Safaee¹,

Sarkar²,

Farzaneh³

2008

Applied Surface Science

112

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Hydrophobic properties of thin nanostructured silver films produced by galvanic exchange reaction on a copper surface were studied after passivation with stearic acid.The morphology of the silver films was controlled by varying the concentration of silver nitrate in the solution. Water contact angle as high as 156° and contact angle hysteresis as low as 5° were achieved for samples obtained with initial silver ion concentration of 24.75 mM in the solution. However, a strong dependence of contact angle and contact angle hysteresis on the fractal-like morphology of the silver films was observed with the variation of silver ion concentration.

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Section: MM (B) 2475 Mm and (C) 396 Mm Respectively; And (D) A Magsupporting

confidence: 90%

Superhydrophobic properties of silver-coated films on copper surface by galvanic exchange reaction

Safaee¹,

Sarkar²,

Farzaneh³

2008

Applied Surface Science

112

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“…Others have used thermal evaporation of n-hexatriacontane (C 36 H 74 ) and shown that this also produces superhydrophobic surfaces. [24] Bhushan et al further developed this by combining thermal evaporation of n-hexatriacontane with micropatterned epoxy replicas as substrates so as to gain several orders of hierarchy, which increased the superhydrophobicity of the surface. [25] Here, we show that the nanoroughness of the thermally deposited n-hexatriacontane wax surface evolves in time via self assembly and this leads to a dramatic change in the wetting properties with a transition from hydrophobic to superhydrophobic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Self‐Assembling, Bioinspired Wax Crystalline Surfaces with Time‐Dependent Wettability

Pechook¹,

Pokroy²

2011

Adv Funct Materials

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One of the most fascinating properties of materials in nature is the superhydrophobic and self‐cleaning capabilities of different plant surfaces. This is usually achieved by the hydrophobic cuticles that are made of cutin and contain wax crystals both within them and on their surfaces. Here, bioinspired n‐hexatriacontane wax films are deposited via thermal evaporation and it is shown that the surface evolves in time via self‐assembly. This leads to a dramatic change in the wetting properties with a transition from hydrophobic to superhydrophobic characteristics, which takes place within several days at room temperature. This phenomenon is investigated and strain‐induced recrystallization is proposed to be the mechanism for it. This work could become the basis for the inspiration and production of tuned, time‐dependant, temperature‐sensitive, variable‐wettability surfaces.

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“…This small value suggests that water does not penetrate significantly into the spaces between the protrusions on the surface. [32] To test this, we also measured the sliding angle (SA) of the treated film. The water drops, with a volume of 10 lL, were observed roll off the superhydrophobic LDH film surface at an angle of ca.…”

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confidence: 99%

In Situ Microstructure Control of Oriented Layered Double Hydroxide Monolayer Films with Curved Hexagonal Crystals as Superhydrophobic Materials

et al. 2006

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Layered double hydroxides (LDHs), also known as hydrotalcite-like materials or anionic clays, are an important class of layered materials. Various studies show that LDHs have a wide range of applications in industry, e.g., catalyst precursors, ion exchangers, adsorbents for environmental contaminants, and substrates for the immobilization of biological material. [1][2][3][4] However, for the purpose of developing novel innovative applications of LDHs as materials for chemical sensors, [5,6] clay-modified electrodes, [7,8] corrosion-resistant coatings, [9,10] membrane catalysis, or components in optical and magnetic devices, intensive studies have been conducted aimed at organizing LDH microcrystals into large uniformly aligned 2D arrays or films. Several methods have been employed to fabricate LDH films on different substrates thus far. For example, LDH microcrystals have been deposited on indium-doped SnO 2 coated glass, platinum disks, and gold electrode surfaces from colloidal suspensions in order to prepare LDH films for electrode modification by deposition [11,12] and Langmuir-Blodgett methods. [8] Most of the films obtained, however, were not oriented or uniformly aligned as it is hard to control the LDH crystallite orientation using these methods. Recently, new techniques have been reported for the fabrication of oriented LDH films. Pinnavaia and co-workers found that colloidal suspensions of LDHs obtained through hydrolysis of LDH/methoxide were able to form transparent and smooth films, [13] in which the LDH microcrystals were extremely well oriented. By employing ultrasonification, Jung and co-workers obtained a monolayer of LDH films with a high packing density and a preferred orientation with the c-axis perpendicular to the substrate surface (ab-face parallel). [14,15] However, this route did not allow control of the orientation of the LDH microcrystals with respect to the substrate plane because of the intrinsic propensity of the microcrystals to align in an orientation that leads to maximum faceto-face contact between the crystals and the substrate. In spite of the progress made during the last decade in research on LDH films and their crystal orientation, there has been no synthetic method for directly growing uniformly aligned LDH polycrystalline films from a substrate. Growing thin films directly from a substrate considerably improves the adherence and the mechanical stability of the resulting thin film, compared to colloidal-deposition techniques (for example, spin-coating, dip-coating, and screen-printing).[16] Therefore, the exploration of new approaches to fabricate oriented LDH films on substrates is of significant importance. Among the existing synthetic methods to fabricate inorganic films, hydrothermal synthesis shows high flexibility in terms of control of the structure and morphology of the resulting inorganic materials. It is also a well-known pathway for fabricating inorganic films with the desired micro-or nanostructure and controlled crystal orientation. Our group has recently repor...

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Fabrication of Superhydrophobic Surfaces of n-Hexatriacontane

Cited by 102 publications

References 22 publications

Superhydrophobic properties of silver-coated films on copper surface by galvanic exchange reaction

Superhydrophobic properties of silver-coated films on copper surface by galvanic exchange reaction

Self‐Assembling, Bioinspired Wax Crystalline Surfaces with Time‐Dependent Wettability

In Situ Microstructure Control of Oriented Layered Double Hydroxide Monolayer Films with Curved Hexagonal Crystals as Superhydrophobic Materials

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