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 .

scholarly journals The Adverse Effects of TiO2 Photocatalycity on Paraloid B72 Hybrid Stone Relics Protective Coating Aging Behaviors under UV Irradiation

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 262
Author(s):  
Wenjuan Li ◽  
Junling Lin ◽  
Yaru Zhao ◽  
Zihe Pan
Keyword(s):  
Contact Angle ◽  
Adverse Effects ◽  
Tio2 Nanoparticles ◽  
Water Contact Angle ◽  
Uv Irradiation ◽  
Protective Coating ◽  
Irradiation Time ◽  
Polymer Coatings ◽  
Angle Measurement ◽  
Water Contact

The incorporation of photocatalytic nanomaterials into polymer coatings is used to protect stone relics from weathering. However, the photocatalytic nanomaterials might generate excess free radicals to degrade the polymer matrix. In this work, a certain amount of TiO2 nanoparticles were dispersed into Paraloid B72 and applied onto sandstone relics to explore the adverse effects of TiO2 nanoparticles on Paraloid B72 under ultraviolet (UV) irradiation. To fulfill this goal, the effects of TiO2 on pore formation and the structure of Paraloid B72 was studied by scanning electron microscopy (SEM). Moreover, the surface chemical composition, pore structure, surface roughness and surface wettability were explored via Fourier transform infrared (FTIR) spectroscopy, SEM, optical profilometer and water contact angle measurement under UV irradiation. Results showed that the incorporation of TiO2 nanoparticles prohibited the generation of pores in Paraloid B72 and there were no pores formed when the content of TiO2 exceeded 0.8 wt%. The water contact angle of origin Paraloid B72 and TiO2/Paraloid B72 decreased with the prolonging UV irradiation. Moreover, TiO2 nanoparticles were extracted from the matrix and the pores cannot be detected with the prolonging UV irradiation time under a higher content of TiO2. These research findings might promote the understanding of using photocatalytic nanomaterials in developing stone relics’ protective coating.

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.

Surface Modification of Natural Rubber Latex Film Using Photocrosslinkable Chitosan

2012 ◽  
Vol 482-484 ◽  
pp. 824-829
Author(s):  
He Ping Yu ◽  
Zong Qiang Zeng ◽  
Hong Chao Liu ◽  
Yong Yue Luo
Keyword(s):  
Contact Angle ◽  
Natural Rubber ◽  
Water Contact Angle ◽  
Irradiation Time ◽  
Natural Rubber Latex ◽  
Water Soluble ◽  
Latex Film ◽  
Latex Films ◽  
Rubber Latex ◽  
Water Contact

Surface modifications of natural rubber latex films were carried out to improve the hydrophilicity by UV-induced immobilization of water-soluble butyryl derivative of chitosan using the photosensitive hetero-bifunctional crosslinking reagent, 4-azidobenzoic acid. The effects of the concentration of modified chitosan solution and UV irradiation time on the water contact angle values of natural rubber latex films were studied. ATR-FTIR analyses confirmed that the O-butylrylchitosan molecules were covalently bonded onto the surface of natural rubber latex film. The water contact angle value of natural rubber latex film which is about 95o reduces to 55o significantly with the introduction of O-butylrylchitosan. The results indicate that the hydrophilic behaviour of natural rubber latex film has been improved by immobilization of O-butylrylchitosan.

Preparation and Properties of TiO2 Thin Films Deposited on Different Substrates by Sol-Gel Method

2014 ◽  
Vol 979 ◽  
pp. 355-358 ◽  
Author(s):  
Tanattha Rattana ◽  
Nirun Witit-Anun ◽  
Sumetha Suwanboon ◽  
Surasing Chaiyakun
Keyword(s):  
Thin Films ◽  
Contact Angle ◽  
Stainless Steel ◽  
Silicon Wafer ◽  
Irradiation Time ◽  
Sol Gel ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Ambient Atmosphere ◽  
Water Contact

In this work, TiO2thin films were prepared by a sol-gel spin coating method on glass slide, stainless steel 304 and silicon wafer substrates. The thin films were annealed at different temperatures at ambient atmosphere. The effect of substrates and annealing temperatures on microstructure, surface morphology and hydrophilicity of the films were characterized by Raman spectroscopy, atomic force microscopy and water contact angle measurement, respectively. The Raman spectra indicated that the annealed TiO2thin films (at 550 °C) coated on stainless steel and silicon wafer exhibited anatase structure. The contact angle of all samples decreased with increasing the UV-irradiation time and annealing temperature.

Effects of Ultraviolet (UV) Treatment on the Properties of Black Tilapia Fish Skins Gelatin

2020 ◽  
Vol 1010 ◽  
pp. 465-470
Author(s):  
Norhasikin Ismail ◽  
Maizlinda Izwana Idris ◽  
Hasan Zuhudi Abdullah
Keyword(s):  
Contact Angle ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Water Contact Angle ◽  
Uv Irradiation ◽  
Functional Group ◽  
Gel Strength ◽  
Fish Gelatin ◽  
Uv Treatment ◽  
Water Contact

The aim of the study is to investigate the effects of ultraviolet (UV) treatment on the properties of black tilapia fish skins gelatin. The fish gelatin were investigated in terms of gel strength, functional group and the water contact angle of the gelatin. The UV treatment were irradiated with UVA and UVC at different time (0.5, 1.0, 1.5 and 2.0 h). The gel strength of gelatin gel significantly increases after UV irradiation for both UVA and UVC sample. The water contact angle of the gelatin was categorized as hydrophobic for both gelatin that treated with UVA and UVC which the angle >65°. The interactions and characteristic of functional groups for gelatin that treated with UV were analyzed via Fourier Transform Infrared Spectroscopy (FTIR). Results indicated that employing UV irradiation as an alternative method to enhance some of the quality attributes of fish gelatin.

scholarly journals Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1050
Author(s):  
Natangue Heita Shafudah ◽  
Hiroki Nagai ◽  
Yutaka Suwazono ◽  
Ryuhei Ozawa ◽  
Yukihiro Kudoh ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Quartz Glass ◽  
Glass Substrate ◽  
Quartz Glass Substrate ◽  
Electrospray Deposition ◽  
Water Contact ◽  
X Ray

Titania precursor films were electrosprayed on a quartz glass substrate, which was pre-modified with an ultra-thin film obtained by spin-coating a single-walled carbon nanotube (SWCNT) dispersed solution. The X-ray diffraction patterns of the thin films obtained by heat-treating the precursor films at 500 °C in air for 1 h indicated that the formed crystals were anatase. A new route to fabricate transparent thin films on the insulating substrate via electrospray deposition (ESD) was thus attained. The photoluminescence spectrum of the thin film showed a peak at 2.23 eV, assignable to the self-trapped exciton of anatase. The Raman spectrum of the thin film demonstrated that heat treatment is useful for removing SWCNTs. The thin film showed a water contact angle of 14 ± 2° even after being kept under dark conditions for 1 h, indicating a high level of hydrophilicity. Additionally, the thin film had a super-hydrophilic surface with a water contact angle of 1 ± 1° after ultraviolet light irradiation with an intensity of 4.5 mW cm−2 at 365 nm for 1 h. The importance of Ti3+ ions in the co-present amorphous phase, which was dominantly formed via the ESD process, for hydrophilicity was also clarified by means of X-ray photoelectron spectroscopy.

scholarly journals Thermoinduced and Photoinduced Sustainable Hydrophilic Surface of Sputtered-TiO2 Thin Film

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1360
Author(s):  
Sangbin Park ◽  
Younghwa Yoon ◽  
Sehyun Lee ◽  
Taejun Park ◽  
Kyunghwan Kim ◽  
...  
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Uv Irradiation ◽  
Tio2 Thin Film ◽  
Maintenance Cost ◽  
Tio2 Films ◽  
Hydrophilic Surface ◽  
Water Contact ◽  
Defect Sites

To achieve self-cleaning at a low maintenance cost, we investigated the possibility of obtaining a sustainable hydrophilic surface of TiO2 thin film. As the hydrophilicity of TiO2 films fabricated by FTS has not yet been studied, we deposited TiOx using FTS, and then TiO2 was formed through additional treatment. Hydrophilic surfaces were obtained by thermoinduced and photoinduced methods. UV irradiation led to the conversion of Ti4+ to Ti3+ in the lattice structure and an increase in the number of OH groups on the surface, and annealing induced the formation of Ti3+ defect sites, as well as organic degradation and changes in the crystal structure. Through the annealing process, the water contact angle of as-deposited film was decreased from 78.7° to 35.7°, and crystallinity changed from amorphous to anatase. These changes contributed to the formation of a hydrophilic surface and reduced the water contact angle by up to 10.8°. After the formation of a hydrophilic surface through annealing and UV irradiation, the sample returned to its original state. We confirmed that the water contact angle of the returned sample was decreased through exposure to sunlight; it reduced the water contact angle of the returned sample by 15.2°. Thus, the results revealed that the crystallinity influences the hydrophilicity and its sustainability for TiO2 films under sunlight.

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.

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