The formation of an air-column on a superhydrophobic surface: the coating is surrounded by blue colored water forming air column, and acquires height nearly 5 mm around boundaries coating. This confirms that surface strongly repels always remains dry.

In the current study, we used a high-speed camera system with particle image velocimetry to observe internal fluidity of water droplets during sliding. The droplets' velocity sliding was controlled by slipping and rolling motions. On superhydrophobic surface, contact angle 150 degrees, droplet fell at high slipping. However, on normal hydrophobic surface whose around 100 both droplet's addition, advancing might be large when slip is area small.

Poly(ethylene terephthalate) (PET) films with a moth-eye-like surface are coated TiO(2) particles to form self-cleaning antireflective films. The use of suspension high concentration coat the PET produces thicker layer smaller pores, whereas low gives thinner larger pores. exhibit transmittance 76-95% and almost no absorption in range 400-800 nm. ≥2 vol % superhydrophilicity after irradiation UV light. After irradiation, superhydrophilic nature is retained for at least 18 days. TiO(2)-coated...

A facile new method that combines electrospray and hydrothermal treatment is used to prepare mesoporous core–shell TiO2 spheres with high specific surface areas pore volumes. Interestingly, the resulting are composed of anatase nanocrystals exposed step-like {001} smooth {010} facets. The percentage facets can be adjusted by changing experimental parameters in processes, such as contents poly(N-vinyl-2-pyrrolidone) acetic acid. combination area (>100 m2 g–1), volume (>0.30 cm3 useful size...

Anatase TiO2 hierarchical nanostructural microspheres with tunable pore size, volume, and specific surface area were prepared by a facile two-step method of electrospray hydrothermal treatment. Compared to the calcination, treatment can transfer electrosprayed porous nanostructures. Adding ammonia in process has great effect on structure microspheres. The hydrothermal-treated samples >2.0 ml being added are composed both big small nanocrystals. Some large nanocrystals grow [001] direction...

Using a laser beam and its reflection, we evaluated surface air layers on two superhydrophobic coatings with different roughnesses (Ra = 1900 74 nm) in water-ethanol mixture. The reflected intensity decreased by increasing the ethanol concentration for coating large roughness because of increased scattering structure solid. However, it was almost constant slightly small roughness, probably liquid-air interface becomes flatter as liquid intrudes into structure. Results demonstrated that...

TiO2 nanotube arrays are important functional materials in photocatalysis. Compared with other materials, the geometrical parameters of nanotubes an array significantly affect photocatalytic activity, but how they do this remains unclear. In present work, a simple theoretical kinetic model to study effects diameter, wall thickness, and length on activity is developed, which reactant (O2) transport considered. The first increases then decreases as diameter thickness increase because changes...

In this study, we prepared various superhydrophobic surfaces using ZnO nanorod arrays (ZnO-NR) of different diameters. The contact angle was equivalent to the calculated value if it is assuming that topmost surface rods a solid-liquid area. On ZnO-NR surfaces, 5 microL water droplets slid down by constant acceleration motion. Sliding governed solid area fraction. resistance force actual measurement consistent with model.

Dew condensation effects on the wettability of rough and smooth coatings two fluoroalkylsilanes (FAS3 FAS17) were investigated by controlling temperature. Contact angles decreased concomitantly with decreasing surface Inflection points in temperature dependence contact observed at dew point. They attributable to change interfacial free energy solid-gas interface water adsorption. The angle decrease suggested a mode transition from Cassie Wenzel surface, resulted increase amount water....

The present study explored the effects of several factors (wetting, light intensity, spectral variation actinic light, heating, and surface acidity) on hydrophilic conversion TiO2 nanocoatings. experimental dependencies efficiencies photoinduced intensity wavelength clearly indicate role electronic photoexcitation in transformation. Particularly, maximum extrema dependence efficiency correspond to energies first indirect direct band-to-band transitions TiO2. At same time, temperature effect...

An analysis system was developed to evaluate the sliding behavior of a liquid droplet on hydrophobic surface. This enables continuous and simultaneous measurement both acceleration shape deformation during droplet. Moreover, velocity vector internal fluidity obtained by employing particle image velocimetry in system. evaluation method pioneers dynamic wettability solid

Four patterned surfaces with hydrophilic areas of different sizes were prepared using photolithography a smooth octadecyltrimethoxysilane (ODS) hydrophobic coating. The area in the was aligned hexagonally constant fraction. sliding angle and contact hysteresis water droplets increased concomitantly increasing pattern size. increase line distortion between defects at receding side plays an important role this trend. droplet velocity also This trend simulated by simple flow model. contribution...

The effect of the triangular pinning region on sliding water droplets smooth hydrophobic surface was investigated. Smooth silane coatings with various regular triangle hydrophilic regions were prepared using photolithography and octadecyltrimethoxysilane (ODS). area in surfaces aligned hexagonally a constant fraction. Thereby contact angles almost equivalent. droplet velocity increased continuously increasing pattern size. Anisotropic observed surface, suggesting different effects. motion...

This paper develops a robust method for the facile synthesis of transparent superhydrophobic TiO2 film by using flame soot layer as nanoimprint template. After and calcination process, coating exhibited inverse roughness structure with high properties. And subsequent hydrophobic modification 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS) rendered surfaces (168 ± 4° water). The transparency superhydrophobicity could be controlled adjusting initial concentration suspension. possesses...

The conventional superhydrophobic surface offered by PTFE provides no sterilization performance and is not sufficiently repellent against organic liquids. These limit PTFE's application in the field of disinfection result a lack durability. N-doped TiO 2 photocatalyst added composite material was developed to remedy these shortcomings. This paper reports characteristics, bactericidal self-cleaning newly-developed material. exhibited contact angle exceeding 150 degrees consistent with its...

Abstract The effect of surface roughness on the internal fluidity a water droplet during sliding an inclined Si treated fluoroalkylsilane (FAS) was investigated using particle image velocimetry (PIV). A slid down by caterpillar-like rotation flow with or without slippage solid–liquid interface. slipping/rolling ratio acceleration depended roughness; advanced rough mainly rolling mechanism.

The evaporation behavior of microliter (2.0 microL) and subnanoliter (0.8 nL) scale water droplets was investigated on two smooth hydrophobic hydrophilic fluoroalkylsilane coatings prepared using chemical vapor deposition. contact angle constant in the second stage for a 2.0 microL droplet coating, but it slightly decreased case 0.8 nL droplet. gradually same almost These differences are expected to originate from their magnitudes signs line tension.

Abstract We have prepared TiO2 nanotubes by anodization in HF or HF/H3PO4 mixed electrolyte. The morphologies and photocatalytic properties of the were changed electrolytes. electrolyte showed higher performance to decompose acetaldehyde photocatalysis than those pure HF.

TiO2 monoliths were prepared, characterized, and evaluated for photocatalytic performance. The found to have an interconnected void lattice a bimodal porous structure with macropores mesopores after calcination at 500–700 °C. Monoliths calcined 500 °C had high specific surface area (93.1 m2/g) porosity (68%), which maintained 700–1100 (51–46%). relatively Vickers hardness (∼104) despite their structure. 700 exhibited performance methylene blue decolorization because of area.