scholarly journals Hydrophobic Properties of CuO Thin Films Obtained by Sol-Gel Spin Coating Technique-Annealing Temperature Effect

2021 ◽  
Vol 45 (6) ◽  
pp. 439-445
Author(s):  
Ali Bougharouat ◽  
Nassim Touka ◽  
Dalila Talbi ◽  
Kamel Baddari
Keyword(s):  
Contact Angle ◽  
Copper Oxide ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Sem Analysis ◽  
Hydroxyl Groups ◽  
Adhesive Properties ◽  
Hydrophobic Properties ◽  
Angle Measurements ◽  
Angle Data

The adhesive characteristics of sol-gel copper oxide (CuO) film surfaces at annealing temperatures ranging from 350 to 550°C were examined in this work. Hydrophobic properties of these oxide film surfaces were studied by contact angle measurements. The surface energy was calculated from contact angle data using harmonic mean method. The structural, morphological and chemical analysis of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR). The increase in annealing temperature induces a reduction in the hydrophilic properties of the films (adhesive properties). The rise in the hydrophobicity of the CuO surface has been claimed to be explained by a change in interfacial tension. The FTIR spectroscopy analysis revealed that the increase in the annealing temperature eliminates activated neutral species (hydroxyl groups) reacting with the surface of the sample responsible for the wettability. SEM analysis showed that the morphology of the samples is nanostructured containing agglomerates of various forms, a few hundred nanometers in size, randomly dispersed across the surface. The enhanced roughness of the produced film is primarily responsible for the increased hydrophobicity of the films. The XRD data reveal that the films are highly textured and that increasing the annealing temperature induces better layer crystallization and confirms the development of copper oxide CuO.

Super-hydrophobic hexamethyl-disilazane modified ZrO2–SiO2 aerogels with excellent thermal stability

2016 ◽  
Vol 4 (15) ◽  
pp. 5632-5638 ◽  
Author(s):  
Jian He ◽  
Xiaolei Li ◽  
Dong Su ◽  
Huiming Ji ◽  
Xing Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Contact Angle ◽  
Elevated Temperatures ◽  
Hydroxyl Groups ◽  
Surface Groups ◽  
Hydrophobic Properties ◽  
Excellent Thermal Stability

Hexamethyl-disilazane (HMDS) is introduced to replace the hydroxyl groups of ZrO2–SiO2 aerogels (ZSAs) to form inert methyl siloxy surface groups and produce SiO2 particles as the “pinning” particles in air at elevated temperatures. Thus, HMDS/ZSAs exhibit an excellent thermal stability and super-hydrophobic properties with a contact angle of 154°.

Organic–inorganic sol-gel thick films for humidity barriers

2008 ◽  
Vol 23 (8) ◽  
pp. 2084-2090 ◽  
Author(s):  
Andrei Jitianu ◽  
Glenn Amatucci ◽  
Lisa C. Klein
Keyword(s):  
Contact Angle ◽  
Thick Films ◽  
Sol Gel ◽  
Attenuated Total Reflection ◽  
Inorganic Materials ◽  
Angle Measurements ◽  
Glass Slides ◽  
Contact Angle Measurements ◽  
Sol Gel Process ◽  
Poly Ethylene

Hybrid thick films were deposited on Surlyn, a copolymer of poly(ethylene- co-methacrylic acid) and a common adhesion film for metal surfaces. Hybrid organic–inorganic materials were prepared by a sol-gel process. Methyltriethoxysilane (MTES) with tetraethoxysilane (TEOS), phenyltriethoxysilane (PhTES) with TEOS, and methyltrimethoxysilane (MTMS) with tetramethoxysilane (TMOS) were investigated. The inorganic component was selected to form the network for the film, while the organic component was selected to repel water and fill porosity. The films were deposited on Surlyn and on glass slides. The properties of the films were investigated using attenuated total reflection Fourier transform infrared (FTIR) and Raman spectroscopy. Contact-angle measurements indicated that the contact angle increased from ∼76.5° for Surlyn alone to ∼89.6° for Surlyn coated with MTES.

A Description of the Wool Fiber Surface Based on Contact Angle Measurements

1997 ◽  
Vol 67 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Thomas J. Horr
Keyword(s):  
Contact Angle ◽  
Fiber Surface ◽  
Wool Fiber ◽  
Surface Model ◽  
Angle Measurements ◽  
Air Interface ◽  
Angle Data ◽  
Contact Angle Measurements ◽  
Surface Liquid ◽  
A Current

Contact angle data from various sources in conjunction with the Israelachvili and Gee equation derived for chemically heterogeneous surfaces are used to describe the wool fiber surface/liquid/air interface. A diagram representing surface compositions consistent with this data is constructed based on the assumption that the wool fiber surface chemical moieties consist of methyl, methylene, and hydrophilic groups. The results from these analyses indicate that the fiber/liquid/air interface is at variance with a current surface model (based on chemical analysis) that predicts a simple methyl-like composition. The paper concludes that the wool fiber surface cannot be described as chemically homogeneous.

scholarly journals Characterization of Sol-Gel Derived Calcium Hydroxyapatite Coatings Fabricated on Patterned Rough Stainless Steel Surface

Coatings ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 334 ◽  
Author(s):  
Vilma Jonauske ◽  
Sandra Stanionyte ◽  
Shih-Wen Chen ◽  
Aleksej Zarkov ◽  
Remigijus Juskenas ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Sol Gel ◽  
Calcium Hydroxyapatite ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Stainless Steel Surface ◽  
Angle Measurements ◽  
Hydroxyapatite Coatings ◽  
Diffuse Reflectance Infrared ◽  
Steel Substrates

Sol-gel derived calcium hydroxyapatite (Ca10(PO4)6(OH)2; CHA) thin films were deposited on stainless steel substrates with transverse and longitudinal patterned roughness employing a spin-coating technique. Each layer in the preparation of CHA multilayers was separately annealed at 850 °C in air. Fabricated CHA coatings were placed in simulated body fluid (SBF) for 2, 3, and 4 weeks and investigated after withdrawal. For the evaluation of obtained and treated with SBF coatings, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), X-ray diffraction (XRD) analysis, Raman spectroscopy, XPS spectroscopy, scanning electron microscopy (SEM) analysis, and contact angle measurements were used. The tribological properties of the CHA coatings were also investigated in this study.

Study of the Hydrophobic Properties of the Surface of an Enamel Material

2014 ◽  
Vol 789 ◽  
pp. 178-182 ◽  
Author(s):  
Li Yun Chen ◽  
Qian Qian Fang ◽  
Wei Zhong Jiang ◽  
Xiao Ping Liao ◽  
Jia Yi Ye ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Composite Materials ◽  
Sol Gel ◽  
Enamel Surface ◽  
X Ray Diffraction ◽  
Hydrophobic Properties ◽  
X Ray ◽  
Scanning Electron

The hydrophobic properties of the surface of an enamel material are reported in this paper. By using a sol-gel method and with tetraethoxysilane as the precursor which is combined with dimethyldichlorosilane (DDS), the films composed of DDS-SiO2nanoparticle composite materials were prepared on an enamel surface, with the droplet’s contact angle increased, and the properties of the enamel surface changed from hydrophilic to hydrophobic. The properties were tested, the hydrophobic mechanism was studied based on the investigation of the microstructure and the crystal structures of the film by scanning electron microscopy, X-ray diffraction and infrared spectrum analysis.

Effects of Air Exposure Time and Annealing Temperature on Superhydrophobic Surface of Titanium Dioxide Films

2017 ◽  
Vol 751 ◽  
pp. 137-142
Author(s):  
S.Tipawan Khlayboonme ◽  
Warawoot Thowladda
Keyword(s):  
Contact Angle ◽  
Surface Morphology ◽  
Exposure Time ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Contact Angles ◽  
Angle Measurement ◽  
Elemental Distribution ◽  
Water Contact ◽  
Air Exposure

TiO2 thin films coated on glass substrates for self-cleaning applications were prepared by sol-gel dip-coating technique. The influence of annealing temperature and air exposure time on wettability was investigated by a water contact-angle measurement. Thermal annealing at temperatures of 100, 200 and 300 °C in air were conducted to the films. Surface morphology of the films was observed by FE-SEM. Elemental distribution and optical properties were examined by EDX mapping and UV-Vis transmission spectroscopy, respectively. Atomic bonding was confirmed by FTIR. The contact angle reached a maximum when the films were annealed at 200 °C. The contact angles of the as-synthesized films were 61.4±2.7°. During storage in air for 20 days, the contact angles increased to 143.1±2.1°. The films were further reannealed with 100 °C for 20 min, the contact angles were enhanced to 153.1±1.3°. The association of contact angle among the surface morphology, elemental distribution and atomic bonding of the films will be discussed.

scholarly journals Effect of Annealing Temperature on Structural and, Morphological Properties of Zno Thins Films

2021 ◽  
Author(s):  
Moustafa Debbab ◽  
Nassera Ghellai ◽  
Meymoun Belaoui ◽  
Chafiaa Yaddadene ◽  
Malika Berouaken ◽  
...  
Keyword(s):  
Contact Angle ◽  
Annealing Temperature ◽  
Morphological Properties ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Diffraction Angle ◽  
Xrd Patterns

Abstract In this work, thins films of zinc oxide were deposited on n-type silicon substrates by chemical electrodeposition. The effect of annealing temperature from 200 ° C to 600 ° C, with a step of 100 ° C, on the structural and morphological properties of ZnO layers has been studied. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and contact angle measurements were used to characterize the morphology and structure of ZnO without and with annealing. The XRD patterns of unannealed ZnO thins films indicate the presence of three intense peaks along (100), (002) and (101) planes, while for the annealed ZnO layers the XRD patterns show also the three major peaks but the intensity of these peaks is increased except for a temperature of 600 ° C where is decreased. The comparison of the XRD patterns of the ZnO layers without and with annealing, reveal a shift in the 2θ diffraction angle, the calculation of the crystallinity confirms the obtained results. The contact angle measurements indicate that the ZnO layers without and with annealing at 200 °C are hydrophobic, the surface of the ZnO layer becomes hydrophilic at annealing temperatures exceeding 300 ° C. Finally, SEM images show the change in structure from a sand rose shape to a granular structure, confirming the XRD and contact angle results.

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