Radiation-induced Surface Wettability Enhancement of an Indium Tin Oxide and Titanium Oxide Film-Coated Sapphire

2021 ◽  
Author(s):  
Kai Wang ◽  
Hui Liang ◽  
Junya Inoue ◽  
Nejdet Erkan ◽  
Koji Okamoto
Keyword(s):  
Contact Angle ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Gamma Ray ◽  
Nucleate Boiling ◽  
Surface Wettability ◽  
Hydroxyl Groups ◽  
Irradiation Effect ◽  
Surface Contact Angle ◽  
Radiation Induced

Abstract Surface wettability is an important parameter that affects nucleate boiling. Irradiation can alter the surface wettability on metal surfaces without altering the surface macrostructure. However, the wettability characteristics of indium tin oxide (ITO) and TiO2 film-coated sapphire substrates remain unknown. We experimentally investigated the gamma-ray and electron beam irradiation effect on such surfaces. A sapphire plate was exposed to gamma rays and electron beams. Within the irradiation dose, no evident change in the sapphire surface color was found. The surface contact angle decreased after irradiation, and surface wettability was enhanced with more irradiation. After irradiation, the contact angle recovered with time. The related mechanism is possible due to the absorption/desorption of hydroxyl groups. Our results indicate that the irradiation method can be used in ITO film-coated sapphire experiments to study nucleate boiling.

Indium tin oxide coated transparent surfaces for the study of nucleate boiling

2003 ◽  
Vol 14 (9) ◽  
pp. 1648-1654 ◽  
Author(s):  
A Zimmermann ◽  
A M Holland ◽  
C P Garner
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Nucleate Boiling

Preparation of indium tin oxide contact to n-CdZnTe gamma-ray detector

2018 ◽  
Vol 112 (11) ◽  
pp. 112101 ◽  
Author(s):  
Leqi Li ◽  
Yadong Xu ◽  
Binbin Zhang ◽  
Aoqiu Wang ◽  
Jiangpeng Dong ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Gamma Ray ◽  
Gamma Ray Detector

Radiation-Induced Defects in Silicon Due to Low-Energetic Ion-Assisted Deposition of Indium Tin Oxide

1989 ◽  
Vol 112 (1) ◽  
pp. 395-403 ◽  
Author(s):  
J. Th. Zettler ◽  
J. Bollmann ◽  
K. H. Heckner ◽  
H. A. Klose
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Radiation Induced ◽  
Induced Defects

scholarly journals Pool Boiling Amelioration by Aqueous Dispersion of Silica Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2138
Author(s):  
Sayantan Mukherjee ◽  
Naser Ali ◽  
Nawaf F. Aljuwayhel ◽  
Purna C. Mishra ◽  
Swarnendu Sen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Contact Angle ◽  
Boiling Heat Transfer ◽  
Base Fluid ◽  
Bubble Diameter ◽  
Pool Boiling ◽  
Nucleate Boiling ◽  
Surface Wettability ◽  
Bulk Fluid ◽  
Pool Boiling Heat Transfer

Non-metallic oxide nanofluids have recently attracted interest in pool boiling heat transfer (PBHT) studies. Research work on carbon and silica-based nanofluids is now being reported frequently by scholars. The majority of these research studies showed improvement in PBHT performance. The present study reports an investigation on the PBHT characteristics and performance of water-based silica nanofluids in the nucleate boiling region. Sonication-aided stable silica nanofluids with 0.0001, 0.001, 0.01, and 0.1 particle concentrations were prepared. The stability of nanofluids was detected and confirmed via visible light absorbance and zeta potential analyses. The PBHT performance of nanofluids was examined in a customized boiling pool with a flat heating surface. The boiling characteristics, pool boiling heat transfer coefficient (PBHTC), and critical heat flux (CHF) were analyzed. The effects of surface wettability, contact angle, and surface roughness on heat transfer performance were investigated. Bubble diameter and bubble departure frequency were estimated using experimental results. PBHTC and CHF of water have shown an increase due to the nanoparticle inclusion, where they have reached a maximum improvement of ≈1.33 times over that of the base fluid. The surface wettability of nanofluids was also enhanced due to a decrease in boiling surface contact angle from 74.1° to 48.5°. The roughness of the boiling surface was reduced up to 1.5 times compared to the base fluid, which was due to the nanoparticle deposition on the boiling surface. Such deposition reduces the active nucleation sites and increases the thermal resistance between the boiling surface and bulk fluid layer. The presence of the dispersed nanoparticles caused a lower bubble departure frequency by 2.17% and an increase in bubble diameter by 4.48%, which vigorously affects the pool boiling performance.

Radiation Induced Surface Activity Phenomenon: 1st Report — Surface Wettability on Metal Oxides

2002 ◽  
Author(s):  
Yasuyuki Imai ◽  
Tatsuya Koga ◽  
Tomoji Takamasa ◽  
Koji Okamoto ◽  
Susumu Uematsu
Keyword(s):  
Metal Oxides ◽  
Surface Activity ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Heating Surface ◽  
Video Camera ◽  
Surface Wettability ◽  
Test Pieces ◽  
Room Condition ◽  
Radiation Induced

Improving the limit of boiling heat transfer or critical heat flux requires that the cooling liquid can contact the heating surface, or a high-wettability, highly hydrophilic heating surface, even if a vapor bubble layer is generated on the surface. We investigated surface wettability using metal oxides irradiated by gamma rays in room condition. Contact angle, an indicator of macroscopic wettability, was measured by image processing of the images obtained by a CCD video camera. The results showed that the surface wettability on oxide metal pieces of titanium, zircalloy No. 4, SUS-304 and copper improved significantly by Radiation Induced Surface Activity (RISA) phenomenon. Highly hydrophilic conditions on the test pieces were achieved after 500 kGy irradiation of 60Co gamma ray.

scholarly journals Superhydrophobic Surface Preparation and Wettability Transition of Titanium Alloy with Micro/Nano Hierarchical Texture

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2210 ◽  
Author(s):  
Zhiru Yang ◽  
Chongchong Zhu ◽  
Nan Zheng ◽  
Dezheng Le ◽  
Jianzhong Zhou
Keyword(s):  
Contact Angle ◽  
Titanium Alloy ◽  
Low Temperature ◽  
Superhydrophobic Surface ◽  
Contact Angles ◽  
Surface Wettability ◽  
Hydroxyl Groups ◽  
Textured Surface ◽  
Textured Surfaces ◽  
Low Temperature Annealing

Microstructures are applied to various hydrophobic/hydrophilic surfaces due to the role of adjusting the surface wettability. In this paper, a 1064 nm pulsed picosecond laser was applied to prepare a micro/nano hierarchical structure on the surface of the titanium alloy (Ti-6Al-4V). The microstructures consist of dimple arrays with various diameters, depths, and areal densities. They are obtained by controlling the pulse energy and the number of pulses. The nanostructures are periodic ripples, which are defined as laser-induced periodic surface structure (LIPSS), and the dimensional parameter of LIPSS can be adjusted by changing the laser energy density and scanning speed. The contact angles of various laser textured surfaces were measured. It is found that the contact angle increases with the density of micro-textured surface increases, and the wetting state of textured surfaces conforms to the Cassie model. Some laser processed samples were subjected to low-temperature annealing treatment. It is observed that the low-temperature annealing process can accelerate the surface wettability transition significantly, which is attributed to the change of the hydroxyl groups on the surface. Finally, a superhydrophobic surface with the maximum contact angle of 144.58° is obtained.

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