Origin of Surprising Attractive Interactions between Electronegative Oxygen Adatoms on Aluminum Surfaces

2016 ◽  
Vol 120 (45) ◽  
pp. 25915-25922 ◽  
Author(s):  
Matic Poberžnik ◽  
Anton Kokalj
Keyword(s):  
Oxygen Adatoms ◽  
Aluminum Surfaces

Effect of Surface Roughness on Pool Boiling Heat Transfer of Water on a Superhydrophilic Aluminum Surface

2017 ◽  
Vol 139 (10) ◽  
Author(s):  
Jinsub Kim ◽  
Seongchul Jun ◽  
Jungho Lee ◽  
Juan Godinez ◽  
Seung M. You
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Boiling Heat Transfer ◽  
Aluminum Surface ◽  
Transfer Coefficients ◽  
Copper Surfaces ◽  
Heat Transfer Coefficients ◽  
Superhydrophilic Surface ◽  
Aluminum Surfaces ◽  
Effect Of Surface

The effect of surface roughness on the pool boiling heat transfer of water was investigated on superhydrophilic aluminum surfaces. The formation of nanoscale protrusions on the aluminum surface was confirmed after immersing it in boiling water, which modified surface wettability to form a superhydrophilic surface. The effect of surface roughness was examined at different average roughness (Ra) values ranging from 0.11 to 2.93 μm. The boiling heat transfer coefficients increased with an increase in roughness owing to the increased number of cavities. However, the superhydrophilic aluminum surfaces exhibited degradation of the heat transfer coefficients when compared with copper surfaces owing to the flooding of promising cavities. The superhydrophilic aluminum surfaces exhibited a higher critical heat flux (CHF) than the copper surfaces. The CHF was 1650 kW/m2 for Ra = 0.11 μm, and it increased to 2150 kW/m2 for Ra = 0.35 μm. Surface roughness is considered to affect CHF as it improves the capillary wicking on the superhydrophilic surface. However, further increase in surface roughness above 0.35 μm did not augment the CHF, even at Ra = 2.93 μm. This upper limit of the CHF appears to result from the hydrodynamic limit on the superhydrophilic surface, because the roughest surface with Ra = 2.93 μm still showed a faster liquid spreading speed.

scholarly journals Writing with atoms: Oxygen adatoms on the MoO2/Mo(110) surface

Nano Research ◽  
2013 ◽  
Vol 6 (12) ◽  
pp. 929-937 ◽  
Author(s):  
Sergey A. Krasnikov ◽  
Olaf Lübben ◽  
Barry E. Murphy ◽  
Sergey I. Bozhko ◽  
Alexander N. Chaika ◽  
...  
Keyword(s):  
Oxygen Adatoms

Development of Nano-Structured Aluminum Surfaces by LSM

2008 ◽  
Author(s):  
Taha Mattar ◽  
Ehab Abdel Rahman ◽  
Ahmed Abdel-Aziz ◽  
Haytham El-Gazzar
Keyword(s):  
Corrosion Resistance ◽  
Surface Layer ◽  
Surface Structure ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Aluminum Surface ◽  
Yag Laser ◽  
Structured Surface ◽  
Aluminum Surfaces

Aluminum is one of most common metals in all advanced and modern scientific and technological applications including electrical, electronic, chemical, engineering, energy and medical fields. The performance of aluminum alloys determines to large extent the quality and economic status of the different processes. Aluminum surface structure determine its performance where nano sized grains and layer can improve aluminum properties and performance. In this work, the improvement of aluminum surface structure and formation of nano structured surface grains by laser surface melting (LSM) using Nd-YAG laser under argon atmosphere was investigated. Different power and scanning speed were applied. The physical and chemical properties of the produced surfaces were examined. SEM, EDX and XRD analyses were performed and were correlated to hardness results. Corrosion resistance of the treated surface was investigated to evaluate their performance in aggressive media and chemical and medical applications. From the obtained data it can be concluded that Nd-YAG laser surface melting of aluminum results in formation of 750 micron nano-structured surface layer. Adjustment of LSM parameters could produce 100 nm grains or less. The obtained results showed also that LSM under argon can eliminate the formation of Al2O3 surface layer which may deteriorates the performance in certain applications. Surface layer rich in AlN is formed upon LSM. It was concluded also that corrosion resistance of the treated aluminum surfaces was improved to large extent by LSM.

High Reactivity of the ZnO(0001) Polar Surface: The Role of Oxygen Adatoms

2017 ◽  
Vol 121 (29) ◽  
pp. 15711-15718 ◽  
Author(s):  
Yang Liu ◽  
Wangping Xu ◽  
Yueyue Shan ◽  
Hu Xu
Keyword(s):  
High Reactivity ◽  
Polar Surface ◽  
Oxygen Adatoms

scholarly journals Corrosion control of aluminum surfaces by polypyrrole films: influence of electrolyte

2007 ◽  
Vol 10 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Andréa Santos Liu ◽  
Maria Auxiliadora Silva Oliveira
Keyword(s):  
Corrosion Control ◽  
Polypyrrole Films ◽  
Aluminum Surfaces
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