Electrical Sheet Resistance and Wetting Properties of TiO2 Nanoparticle Thin Films Prepared by Sparking Process

2017 ◽  
Vol 866 ◽  
pp. 313-317
Author(s):  
Buppachat Toboonsung
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Contact Angle ◽  
Sheet Resistance ◽  
Water Contact Angle ◽  
Annealing Temperature ◽  
Water Contact ◽  
Titanium Dioxide Nanoparticle ◽  
Wetting Properties ◽  
Scanning Electron

An electrical sheet resistance and water contact angle of titanium dioxide nanoparticle thin films were prepared by sparking process. The experiments were carried out by the titanium wires as electrodes of sparking process and varied the sparking time of 1-4 h and the annealing temperature of 200-400 OC for 2 h. The as-deposited and as-annealed of thin films on glass substrate were measured a water contact angle and a sheet resistance whereas a surface was analyzed by a scanning electron microscopy. The results found that the optimum as-deposited TiO2 NP thin films was shown the homogeneity surface, the minimum sheet resistance and the duplicate water contact at the sparking time of 3 h. The optimum as-deposited TiO2 NP thin films was annealed which the water contact angle and the sheet resistance of the as-annealed TiO2 NP thin films decreased with increasing the annealing temperature. However, the hydrophilic property was shown optimum at the annealing temperature of 400 OC.

Surface Morphologies and Durability on Water Contact Angle of Titanium Dioxide Nanoparticle Thin Films

2019 ◽  
Vol 798 ◽  
pp. 158-162
Author(s):  
Buppachat Toboonsung
Keyword(s):  
Thin Films ◽  
Contact Angle ◽  
Titanium Dioxide ◽  
Surface Temperature ◽  
Water Contact Angle ◽  
High Voltage Power Supply ◽  
Water Contact ◽  
Titanium Dioxide Nanoparticle ◽  
Air Atmosphere ◽  
Angle Data

Titanium dioxide nanoparticle thin films on the glass slide of 5x20 cm2 as substrate were prepared by sparking method. The sparking system was modified by using titanium wires as an anode of 9 pieces and a cathode of 9 pieces which set the gap between the electrodes of 1 mm and connected a high voltage power supply. The sparking method was controlled a surface temperature of substrate as 26, 100 and 150 OC and a sparking time of 1-5 h in air atmosphere. The as-deposited thin films were analyzed by a scanning electron microscope, measured the water contact angle of 180 days and studied the durability of thin films on glass substrate to the drop water. The result indicated that the optimum condition of the as-deposited thin films was shown at the sparking time of 4 h and surface temperature of 150 OC which shown the homogeneity surface, the hydrophilic properties. The water contact angle increased with increasing the sparking time whereas the increasing surface temperature was found the decreasing of water contact angle. The optimum durability of thin films was used a minimum of a standard deviation (S.D.) at 4.27 which calculated from the water contact angle data from 1-180 days.

scholarly journals A Study on the Characteristics of Cu–Mn–Dy Alloy Resistive Thin Films

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 118 ◽  
Author(s):  
Ho-Yun Lee ◽  
Chi-Wei He ◽  
Ying-Chieh Lee ◽  
Da-Chuan Wu
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Annealing Temperature ◽  
Phase Evolution ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Temperature Coefficient Of Resistance ◽  
X Ray ◽  
Transmission Electronmicroscopy ◽  
Scanning Electron

Cu–Mn–Dy resistive thin films were prepared on glass and Al2O3 substrates, which wasachieved by co-sputtering the Cu–Mn alloy and dysprosium targets. The effects of the addition ofdysprosium on the electrical properties and microstructures of annealed Cu–Mn alloy films wereinvestigated. The composition, microstructural and phase evolution of Cu–Mn–Dy films werecharacterized using field emission scanning electron microscopy, transmission electronmicroscopy and X-ray diffraction. All Cu–Mn–Dy films showed an amorphous structure when theannealing temperature was set at 300 °C. After the annealing temperature was increased to 350 °C,the MnO and Cu phases had a significant presence in the Cu–Mn films. However, no MnO phaseswere observed in Cu–Mn–Dy films at 350 °C. Even Cu–Mn–Dy films annealed at 450 °C showedno MnO phases. This is because Dy addition can suppress MnO formation. Cu–Mn alloy filmswith 40% dysprosium addition that were annealed at 300 °C exhibited a higher resistivity of ∼2100 μΩ·cm with a temperature coefficient of resistance of –85 ppm/°C.

SiO2ZrO2 Thin Films as Low Temperature NO2 and O3 Sensors

2015 ◽  
Vol 1088 ◽  
pp. 81-85 ◽  
Author(s):  
T.N. Myasoedova ◽  
Victor V. Petrov ◽  
Nina K. Plugotarenko ◽  
Dmitriy V. Sergeenko ◽  
Galina Yalovega ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Low Temperature ◽  
Annealing Temperature ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Operating Temperatures ◽  
Scanning Electron

Thin SiO2ZrO2films were prepared, up to 0.2 μm thick, by means of the sol–gel technology and characterized by a Scanning electron microscopy and X-ray diffraction. It is shown the presence of monoclinic, cubic and tetragonal phases of ZrO2in the SiO2matrix. The crystallites sizes depend on the annealing temperature of the film and amount to 35 and 56 nm for the films annealed at 773 and 973 K, respectively. The films resistance is rather sensitive to the presence of NO2and O3impurity in air at lower operating temperatures in the range of 30-60°C.

scholarly journals Influence of Annealing and UV Irradiation on Hydrophilicity of Ag- Nanostructured Thin Films

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Fanming Meng ◽  
Zhaoqi Sun ◽  
Xueping Song
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Uv Irradiation ◽  
Annealing Time ◽  
Irradiation Time ◽  
Ambient Air ◽  
Water Contact ◽  
Nanostructured Thin Films

Ag-TiO2nanostructured thin films with silver content of 5 vol% have been deposited on silicon, glass, and quartz substrates by RF magnetron sputtering and annealed in ambient air at 900°C for 15, 30, 60, 90, and 120 min. Their crystal structure, surface morphology, and hydrophilicity have been characterized by X-ray diffractometer, atomic force microscope, and water contact angle apparatus, respectively. The influence of annealing time and UV irradiation time on hydrophilic property of Ag-TiO2thin films have been studied in detail. It is shown that annealing time influences crystal structure of Ag-TiO2thin films. The unannealed film is amorphous and shows poor hydrophilicity. With the increase of annealing time from 15 to 120 min, the grain-size slowly increases and tends to uniformity. A suitable annealing time can significantly enhance the hydrophilic behavior of Ag-TiO2films. Water contact angle decreases with the increase of irradiation time. The mechanism of hydrophilicity has been proposed and can be attributed to the increase of oxygen anion radicals and reactive center of surface .

Structural and Morphological Properties of HfxZr1-xO2 Thin Films Prepared by Pechini Route

2010 ◽  
Vol 644 ◽  
pp. 113-116
Author(s):  
L.A. García-Cerda ◽  
Bertha A. Puente Urbina ◽  
M.A. Quevedo-López ◽  
B.E. Gnade ◽  
Leo A. Baldenegro-Perez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Annealing Temperature ◽  
Precursor Solution ◽  
Dip Coating ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dip Coating Technique ◽  
Scanning Electron

In this study, HfxZr1-xO2 (0 < x < 1) thin films were deposited on silicon wafers using a dip-coating technique and by using a precursor solution prepared by the Pechini route. The effects of annealing temperature on the structure and morphological properties of the proposed films were investigated. HfxZr1-xO2 thin films with 1, 3 and 5 layers were annealed in air for 2 h at 600 and 800 °C and the structural and morphological properties studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results show that the films have monoclinic and tetragonal structure depending of the Hf and Zr concentration. SEM photographs show that all films consist of nanocrystalline grains with sizes in the range of 6 - 13 nm. The total film thickness is about 90 nm.

scholarly journals INFLUENCE OF POLYETHYLENE OXIDE CONTENT ON SOME CHARACTERISTICS OF PLA/CS FILMS LOADING NIFEDIPINE

2017 ◽  
Vol 55 (6) ◽  
pp. 716 ◽  
Author(s):  
Nguyen Thuy Chinh ◽  
Trang Thi Thu Nguyen ◽  
Mai Thi Tran ◽  
Cong Van Do ◽  
Huynh Duc Mai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Polylactic Acid ◽  
Field Emission ◽  
Polyethylene Oxide ◽  
Oxide Content ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Scanning Electron

This work mentions the effect of polyethylene oxide (PEO) content on some characteristics and properties of polylactic acid (PLA)/chitosan (CS) films loading nifedipine (NIF). The water contact angle, droplet size values and Field Emission Scanning Electron Microscopy (FESEM) images  of the films are used to investigate their morphology and hydrophobicity. The obtained results show that the hydrophobic property of the PLA/CS/NIF films is improved by the presence of PEO. Besides, the PLA/CS/NIF films containing PEO have tighter structure and water absorbed ability less than those of the PLA/CS/NIF films

scholarly journals Wetting Properties of the CO2–Water–Calcite System via Molecular Simulations: Shape and Size Effects

2019 ◽  
Author(s):  
Alessandro Silvestri ◽  
Evren Ataman ◽  
Akin Budi ◽  
Susan Stipp ◽  
Julian D Gale ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Water Droplet ◽  
Aqueous Fluid ◽  
Water Model ◽  
Correct Prediction ◽  
Mineral Surfaces ◽  
Water Contact ◽  
Local Conditions ◽  
Wetting Properties

<p>Assessment of the risks and environmental impacts of carbon geosequestration requires knowledge about the wetting behavior of mineral surfaces in the presence of CO<sub>2</sub> and the pore fluids. In this context, the interfacial tension (IFT) between CO<sub>2</sub> and the aqueous fluid and the contact angle, theta, with the pore mineral surfaces are the two key parameters that control the capillary pressure in the pores of the candidate host rock. Knowledge of these two parameters and their dependence on the local conditions of pressure, temperature and salinity is essential for the correct prediction of structural and residual trapping. We have performed classical molecular dynamics simulations to predict the CO<sub>2</sub>–water IFT and the CO<sub>2</sub>–water–calcite contact angle. The IFT results are consistent with previous simulations, where simple point charge water models have been shown to underestimate the water surface tension, thus affecting the simulated IFT values. When combined with the EPM2 CO<sub>2</sub> model, the SPC/Fw water model indeed underestimates the IFT in the low pressure region at all temperatures studied. On the other hand, at high pressure and low temperature, the IFT is overestimated by ~5 mN/m. Literature data regarding the water contact angle on calcite are contradictory. Using our new set of force field parameters, we performed NVT simulations at 323 K and 20 MPa to calculate the contact angle of a water droplet on the calcite {10.4} surface in a CO<sub>2</sub> atmosphere. We performed simulations for both spherical and cylindrical droplet configurations for different initial radii, to study the size dependence of the water contact angle on calcite in the presence of CO<sub>2</sub>. Our results suggest that the contact angle of a cylindrical water droplet on calcite {10.4}, in the presence of CO<sub>2</sub>, is independent of droplet size, for droplets with a radius of 50 Å or more. On the contrary, spherical droplets make a contact angle that is strongly influenced by their size. At the largest size explored in this study, both spherical and cylindrical droplets converge to the same contact angle, 38 degrees, indicating that calcite is strongly wetted by water.</p>

Preparation of BiOI Photocatalysts with Controllable Wettability and Their Enhanced Catalytic Degradation of 17α-ethinylestradiol

NANO ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. 2050150
Author(s):  
Sifeng Zhang ◽  
Lulu Wang ◽  
Ziguang Zheng ◽  
Yunrui Hei ◽  
Luting Zhou ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Removal Rate ◽  
Chemical Properties ◽  
Water Contact ◽  
X Ray ◽  
Photocatalytic Performances

In this study, BiOI was successfully synthesized using a hydrothermal method and then modified using hexamethyldisiloxane (HMDS) and polydimethylsiloxane (PDMS), respectively, to achieve a controllable water contact angle (WCA) for these materials. The physical and chemical properties of the modified BiOI were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) method, UV–Vis diffuse reflectance spectroscopy (DRS), Fourier transform infrared (FTIR) spectroscopy and water contact angle (WCA) techniques. Compared with the unmodified BiOI, HMDS- and PDMS-modified BiOI had higher photocatalytic activities for 17[Formula: see text]-ethinylestradiol (EE2) under visible light irradiation for 28 min after reacting in dark for 30 min. When BiOI was modified using HMDS and PDMS, the WCA increased. When the WCA of HMDS- and PDMS-modified BiOI was controlled in the range of 25.3–32.7[Formula: see text] and 38.1–78.5[Formula: see text], respectively, better photocatalytic performances were achieved. When the WCA of modified BiOI was 29.7[Formula: see text] (1.00[Formula: see text]mL HMDS) and 47.8[Formula: see text] (0.20[Formula: see text]mL PDMS), the best photocatalytic performances were achieved with EE2 removal rate of 98.85% and 98.72%, respectively, however, the removal rate of the unmodified BiOI was 85.01%. The reaction rate constants of BiOI (1.00[Formula: see text]mL HMDS) and BiOI (0.20[Formula: see text]mL PDMS) were 2.33 and 2.15 times higher than the unmodified BiOI, respectively. The improved catalytic performances of modified BiOI could be attributed to the synergistic effect of the controlled wettability of BiOI and functional groups on the surface of photocatalysts.

scholarly journals Surface Modification of Lightweight Mortars by Nanopolymers to Improve Their Water-Repellency and Durability

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1350 ◽  
Author(s):  
Małgorzata Szafraniec ◽  
Danuta Barnat-Hunek ◽  
Małgorzata Grzegorczyk-Frańczak ◽  
Maciej Trochonowicz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Lightweight Aggregate ◽  
Water Repellency ◽  
Fold Increase ◽  
Wetting Properties ◽  
Hydrophobic Coating ◽  
Structure Surface ◽  
Scanning Electron

The paper explores the possibility of covering the mortar with the lightweight aggregate by the nanopolymer silane and siloxane as surface hydrophobisation. The investigation involved the mortars with two types of hydrophobic agents diluted with water in a ratio of 1:4 and 1:8. Mortar wetting properties were determined by measuring the absorbability, water vapor diffusion, contact angle (CA) and surface free energy (SFE) of their structure. Surface micro-roughness and 2D topography were evaluated. Scanning electron microscopy (SEM) has shown the microstructure and distribution of pores in mortars. The reduction in absorbency after the first day of testing by 87% was shown. An improvement in frost resistance after 25 cycles by 97% and an 18-fold decrease in weight loss after the sulphate crystallization test were observed. The hydrophobic coating reduces the SFE of mortars and increases the CA. In the case of using silanes, a 9-fold increase CA was observed.

scholarly journals Superhydrophobicity/Superhydrophilicity Transformation of Transparent PS-PMMA-SiO2 Nanocomposite Films

2018 ◽  
Vol 63 (3) ◽  
pp. 226 ◽  
Author(s):  
A. Sriboonruang ◽  
T. Kumpika ◽  
W. Sroila ◽  
E. Kantarak ◽  
P. Singjai ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
High Water ◽  
Dip Coating ◽  
Nanocomposite Films ◽  
Water Contact ◽  
Treatment Conditions ◽  
Coating Method

A transparent superhydrophobic nanocoating with high water contact angle (>150∘ ) was successfully prepared by a simple dip coating method. The coating solutions were prepared by the dissolution of polystyrene (PS) and poly(methyl methacrylate) (PMMA) in toluene. Fumed silica (SiO2) was then added to increase the roughness of the coating. The annealing treatment conditions were investigated to optimize the water contact angle. The heat treatment conditions and other factors were studied systematically to optimize the transmission and the contact angle of water on the films. The results have shown that the films increase with the annealing temperature. The superhydrophobicity of films is observed only in PS-consisted films after the annealing at 200 ∘C. The superhydrophobic/superhydrophilic transformation was achieved at the annealing temperature higher than 200 ∘C due to the decay of the polymer into hydrophilic monomers.

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