Defect-Induced Wetting Behavior on Solid Polar Surfaces with Small Charge Dipole Length

2017 ◽  
Vol 121 (32) ◽  
pp. 17365-17370 ◽  
Author(s):  
Yifei Qiu ◽  
Yang Liu ◽  
Yusong Tu ◽  
Chunlei Wang ◽  
Yousheng Xu
Keyword(s):  
Wetting Behavior ◽  
Polar Surfaces ◽  
Small Charge ◽  
Dipole Length

Wetting behavior of water on silicon carbide polar surfaces

2016 ◽  
Vol 18 (40) ◽  
pp. 28033-28039 ◽  
Author(s):  
W. W. Zhong ◽  
Y. F. Huang ◽  
D. Gan ◽  
J. Y. Xu ◽  
H. Li ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Band Gap ◽  
Wide Band ◽  
Wide Band Gap ◽  
Wetting Behavior ◽  
Polar Surfaces ◽  
Wide Band Gap Semiconductors

Technically important wide band-gap semiconductors such as GaN, AlN, ZnO and SiC are crystallized in polar structures.

On the Faceting of Polar Ceramic Surfaces: Microscopy and Holography Studies of MGO(111) Surfaces

1996 ◽  
Vol 54 ◽  
pp. 366-367
Author(s):  
M. Gajdardziska-Josifovska ◽  
B. G. Frost ◽  
E. Völkl ◽  
L. F. Allard
Keyword(s):  
Electron Microscopy ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Electron Holography ◽  
Flat Surfaces ◽  
Transmission Electron ◽  
Excess Surface ◽  
Polar Surfaces ◽  
Salt Structure ◽  
Crystallographic Planes

Polar surfaces are those crystallographic faces of ionically bonded solids which, when bulk terminated, have excess surface charge and a non-zero dipole moment perpendicular to the surface. In the case of crystals with a rock salt structure, {111} faces are the exemplary polar surfaces. It is commonly believed that such polar surfaces facet into neutral crystallographic planes to minimize their surface energy. This assumption is based on the seminal work of Henrich which has shown faceting of the MgO(111) surface into {100} planes giving rise to three sided pyramids that have been observed by scanning electron microscopy. These surfaces had been prepared by mechanical polishing and phosphoric acid etching, followed by Ar+ sputtering and 1400 K annealing in ultra-high vacuum (UHV). More recent reflection electron microscopy studies of MgO(111) surfaces, annealed in the presence of oxygen at higher temperatures, have revealed relatively flat surfaces stabilized by an oxygen rich reconstruction. In this work we employ a combination of optical microscopy, transmission electron microscopy, and electron holography to further study the issue of surface faceting.

WETTING BEHAVIOR OF WATER MICRODROPLETS IN NATURAL EVAPORATION

2017 ◽  
Vol 48 (12) ◽  
pp. 1077-1088
Author(s):  
Yukihiro Yonemoto ◽  
Tomoaki Kunugi
Keyword(s):  
Wetting Behavior

scholarly journals Wetting Behavior of Molten FeO-SiO2 Slag to Al2O3-SiO2 Refractories

1987 ◽  
Vol 73 (3) ◽  
pp. 484-490 ◽  
Author(s):  
Seiji YOKOYAMA ◽  
Yoshimoto WANIBE ◽  
Hiroshi SAKAO
Keyword(s):  
Wetting Behavior

scholarly journals Wetting Behavior of the Ag-5CuO Brazing Alloy on ZTA Composite Ceramic with/without CuO Coating in Air

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 609
Author(s):  
Guangjie Feng ◽  
Manqin Liu ◽  
Yalei Liu ◽  
Zhouxin Jin ◽  
Yifeng Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Triple Line ◽  
Composite Ceramic ◽  
Heating Process ◽  
Wetting Behavior ◽  
Subsequent Heating ◽  
Rich Liquid ◽  
Zirconia Toughened Alumina ◽  
Pure Al2o3

The wetting of Ag-5 wt.% CuO (Ag-5CuO) alloy on initial/CuO-coated zirconia toughened alumina (ZTA) composite ceramic in air was studied in detail. The results showed that the contact angle of the Ag-5CuO/ZTA system rapidly decreased from 81° at 970 °C to 45° at 990 °C during the heating process, however, moderate reductions in contact angle were observed in the subsequent heating and temperature holding stages. In comparison with the contact angle of pure Al2O3, an increment of about 4° of the stable contact angle of Ag-5CuO alloy on the heterogeneous ZTA was observed. The reaction between Al2O3 and CuO can reduce the damage of the CuO-rich liquid to ZrO2 in the ZTA substrate. Both oxygen and CuO were helpful in reducing the contact angle of Ag on ZTA and enhancing the bonding of the Ag/ZTA interface. The continuous CuO coating on ZTA and the monotectic liquid containing more CuO in the region near the triple line induced reductions of more than 40° and about 10° in the contact angle, respectively, between the initial and the CuO coating-improved wetting systems.

scholarly journals Biomimetic Approach for the Elaboration of Highly Hydrophobic Surfaces: Study of the Links between Morphology and Wettability

Biomimetics ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 38
Author(s):  
Quentin Legrand ◽  
Stephane Benayoun ◽  
Stephane Valette
Keyword(s):  
Contact Angle ◽  
Ginkgo Biloba ◽  
Contact Angle Hysteresis ◽  
Contact Angles ◽  
Textured Surfaces ◽  
Replication Process ◽  
Wetting Behavior ◽  
Static Contact ◽  
Biomimetic Approach ◽  
Highly Hydrophobic

This investigation of morphology-wetting links was performed using a biomimetic approach. Three natural leaves’ surfaces were studied: two bamboo varieties and Ginkgo Biloba. Multiscale surface topographies were analyzed by SEM observations, FFT, and Gaussian filtering. A PDMS replicating protocol of natural surfaces was proposed in order to study the purely morphological contribution to wetting. High static contact angles, close to 135∘, were measured on PDMS replicated surfaces. Compared to flat PDMS, the increase in static contact angle due to purely morphological contribution was around 20∘. Such an increase in contact angle was obtained despite loss of the nanometric scale during the replication process. Moreover, a significant decrease of the hysteresis contact angle was measured on PDMS replicas. The value of the contact angle hysteresis moved from 40∘ for flat PDMS to less than 10∘ for textured replicated surfaces. The wetting behavior of multiscale textured surfaces was then studied in the frame of the Wenzel and Cassie–Baxter models. Whereas the classical laws made it possible to describe the wetting behavior of the ginkgo biloba replications, a hierarchical model was developed to depict the wetting behavior of both bamboo species.

Enhanced wetting behavior using femtosecond laser-textured surface in laser welding-brazing of Ti/Al butt joint

2021 ◽  
Vol 142 ◽  
pp. 107212
Author(s):  
Xi Chen ◽  
Zhenglong Lei ◽  
Yanbin Chen ◽  
Meng Jiang ◽  
Nan Jiang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Welding ◽  
Butt Joint ◽  
Textured Surface ◽  
Wetting Behavior

Interface coupling and charge doping in graphene on ferroelectric BiAlO3(0001) polar surfaces

2021 ◽  
Vol 23 (5) ◽  
pp. 3407-3416
Author(s):  
Jin Yuan ◽  
Jian-Qing Dai ◽  
Cheng Ke ◽  
Zi-Cheng Wei
Keyword(s):  
Dft Calculations ◽  
Hybrid System ◽  
First Principles ◽  
Doping Effect ◽  
Coupling Mechanism ◽  
Polarization Reversal ◽  
Interface Coupling ◽  
Polar Surfaces ◽  
Charge Doping

The interface coupling mechanism, charge doping effect, and effect of polarization reversal in the graphene/BiAlO3(0001) hybrid system are explored by first-principles DFT calculations.

Effect of crystal orientation on droplet wetting behavior on single-crystal Al2O3 substrates: An experimental study

2020 ◽  
Vol 32 (12) ◽  
pp. 127110
Author(s):  
Chengyu He ◽  
Tie Liu ◽  
Lei Tian ◽  
Yubao Xiao ◽  
Shang Yuan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Single Crystal ◽  
Crystal Orientation ◽  
Wetting Behavior
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