Water repellent porous silica films by sol–gel dip coating method

Rao, A. Venkateswara; Gurav, Annaso B.; Latthe, Sanjay S.; Vhatkar, Rajiv S.; Imai, Hiroaki; Kappenstein, Charles; Wagh, P. B.; Gupta, Satish C.

doi:10.1016/j.jcis.2010.08.003

Cited by 82 publications

(41 citation statements)

References 30 publications

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“…In recently, superhydrophobic surfaces (with water contact angle larger than 150° and sliding angle (SA) is smaller than 10°) have shown great interest due to the potential application in selfcleaning materials [3], antifogging surfaces [4], antireflective surfaces [5], microfluid manipulation [6] and so on. Many novel methods for the fabrication of super hydrophobic surfaces have been developed such as anodic oxidation [7,8], chemical deposition [9], chemical etching [10][11][12][13][14][15], chemical vapor deposition [16][17][18][19], colloidal self-assembly [20][21][22], electrospinning [23,24], sol-gel [25,26] and some others [27,28].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Mechanically Stable Superhydrophobic Aluminium Surface with Excellent Self-Cleaning and Anti-Fogging Properties

Varshney

Mohapatra

Kumar

2017

Preprint

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Development of the self-cleaning and anti-fogging superhydrophobic coating for aluminum surfaces which is durable in the aggressive conditions has raised tremendous interest in materials science.In this work, by employing chemical etching technique with mixture of hydrochloric and nitric acid, followed by passivation with lauric acid, superhydrophobic aluminum surface was synthesized. The surface morphology analysis reveals the presence of rough microstructures on coated aluminium surface.Superhydrophobicity with water contact angle of 170 ± 3.9° and sliding angle of 4 ± 0.5° is achieved.Surface bounces off the high speed water jet, indicating excellent water-repellent nature of coating. It is also continuously floated on water surface for several weeks, showing excellent buoyancy nature.Additionally, coating maintains its superhydrophobicity after undergoing 100 cycles of adhesive tape peeling test. Its superhydrophobic nature withstands 90° and 180° bending, and repeated folding and defolding. Coating exhibits the excellent self-cleaning property. In low temperature condensation test, almost no accumulation of water drops on the surface, showing the excellent anti-fogging property of coating. This approach can be applied to any size and shape of aluminium surface and hence has great industrial applications.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Mechanically Stable Superhydrophobic Aluminium Surface with Excellent Self-Cleaning and Anti-Fogging Properties

Varshney

Mohapatra

Kumar

2017

Preprint

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“…Higher humidity also leads to higher vapor pressure, which may alter the native oxide layer composition of silicon due to reaction between the -OH surface group and the ambient water. 78 …”

Section: Effect Of Ph On Sophorolipid Surface Assemblymentioning

confidence: 99%

Surface-induced assembly of sophorolipids

Peyre

Hamraoui

Faustini

et al. 2017

Phys. Chem. Chem. Phys.

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The surface self-assembly properties of acidic sophorolipids, a bolaform microbial glycolipids with pHresponsive properties in solution, were studied based on the chemical nature of the support and pH of the solution. Sophorolipids generally form micelles in water but formation of morphologies like platelets and twisted fibers depending on pH have also been reported. The surface self-assembly was achieved using dip-coating on three different substrates namely gold, silicon(111) and TiO 2 anatase. Deposition conditions (dip-coating withdrawal speed, relative humidity, temperature) were tested, and it was found that optimum self-assembly occurred at a withdrawal speed of 1 mm s À1 , T of 25 1C and relative humidity of 25%. The local structure of the sophorolipid films was characterized by Atomic Force Microscopy, while Scanning Electron Microscopy was used to characterize the spatial homogeneity. We also attempted to correlate dispersive, electron donor and electron attractor surface energy components, using Good-Van Oss's approach, and the behavior of sophorolipids. We found that when the surface energy is dominated by dispersive components, sophorolipids spontaneously assemble into entangled needles at all pH values (4, 6 and 11). However, when the surface energy is dominated by electronic components, pH has a strong influence on the surface self-assembly. We could discriminate three major organizations: homogeneous layer, isolated aggregates and a two-dimensional network similar to block copolymer surface self-assembly.

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“…However, there is not any report on the preparation of hydrophobic silica film by one-step sol-gel process using Isooctyltrimethoxysilane as a modifying agent. Many reports are available for the evaluation of the effect of the hydrophobic agent on the water repellency [1,24,28,[32][33][34][35]. They reported that in single-step sol-gel method with increasing the concentration of the hydrophobic agent, contact angle increased.…”

Section: Page 3 Of 34mentioning

confidence: 99%