Investigating the use of Nanoscale Bilayers Assembly on Stainless Steel Plate to Improve Evaporation

2013 ◽  
Vol 395-396 ◽  
pp. 718-725 ◽  
Author(s):  
Shen Chun Wu ◽  
Dawn Wang ◽  
Hsih Shing Li ◽  
Sin Jie Lin ◽  
Chao Tsai Hsu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Surface Modification ◽  
Contact Angles ◽  
Steel Plates ◽  
Stainless Steel Surface ◽  
Hydrophilic Surface ◽  
Evaporation Time ◽  
Assembly Technique ◽  
The Relationship

This study investigated the use of nanoscale bilayers assembly film for hydrophilic surface modification on stainless steel plates and observed its effects on the evaporation of acetone and ethanol on the plates. This study first established the nanoscale bilayers assembly technique, and then performed hydrophilic surface modification on stainless steel plates by changing the surface structure, producing different contact angles. The relationship between the number of bilayers (10, 20, and 30) and the resulting contact angle was empirically determined; results indicated that 20-bilayer modification yielded the best result, reducing the contact angle from 70° (unmodified surface) to 12°. Beyond 20 bilayers, at 30 bilayers, the samples show no significant changes or improvements to contact angle or hydrophilicity. Results from evaporation time tests showed that, compared to the evaporation time of ethanol and acetone on unmodified flat stainless steel surface, this decreased contact angle can improve the evaporation time by 100%, clearly indicating that hydrophilic surface modifications causes significant improvement in evaporation.

Investigating the Use of Nanoscale Bilayers Assembly on Stainless Steel Plate for Surface Hydrophilic Modification

2013 ◽  
Vol 401-403 ◽  
pp. 792-795 ◽  
Author(s):  
Shen Chun Wu ◽  
Dawn Wang ◽  
Sin Jie Lin ◽  
Pin Wun Ciou ◽  
Chen Yu Chung ◽  
...  
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Surface Modification ◽  
Steel Plate ◽  
Optimal Number ◽  
Hydrophilic Surface ◽  
Stainless Steel Plate ◽  
Hydrophilic Modification ◽  
Assembly Method ◽  
The Relationship

This study investigated the use of nanoscale bilayers assembly for hydrophilic surface modification on stainless steel plate. This study first performed nanoscale bilayers assembly method, with the addition of top layer coatings for durability purposes, to modify the surface structure and thereby the hydrophilicity of the surface at 15, 17, 20, 23, and 25 bilayers. The relationship between the number of bilayers and the resulting contact angle was then empirically established. Results showed 17 bilayers to be the optimal number of bilayers among the samples tested, resulting in the smallest contact angle of 11° (compared to 70° on unmodified surface), corresponding to the highest surface wettability and hydrophilicity. From 0 to 17 bilayers, the contact angle seems to decrease linearly with the number of bilayers. Beyond 17 bilayers, at 20, 23, 25, and 30 bilayers, the samples showed no significant improvements in contact angle or hydrophilicity.

Investigating the Effect of Hydrophilic Surface Modification on Droplet Evaporation

2015 ◽  
Vol 1120-1121 ◽  
pp. 779-784
Author(s):  
Shen Chun Wu ◽  
Sin Jie Lin ◽  
Dawn Wang ◽  
Yau Ming Chen
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Thin Layers ◽  
Steel Plates ◽  
Transfer Enhancement ◽  
Flat Plates ◽  
Assembly Method ◽  
Evaporation Heat ◽  
Steel Surfaces ◽  
The Relationship

In this study, surface modification of stainless steel flat plates was performed using nanoscale bilayers assembly method to increase the surface’s hydrophilicity and enhance evaporation. Thin layers of SiO2 nanoparticles layered onto the stainless steel surfaces were used to modify their surface properties, and the relationship between the number of layers (0~20) and water’s hydrophilicity (surface tension) was investigated. The effects of modification on evaporation were then tested using de-ionized water. According to experimental results, surface modification was able to reduce the contact angle of water on stainless steel flat plate from the unmodified 87o to 7o at 18 layers, significantly increasing the hydrophilicity of the surface. Evaporation experiments show that the evaporation heat transfer enhancement for droplets on stainless steel plates is at least 300%.Keywords: bilayers assembly, hydrophilicity, surface modification, evaporation performance

Investigating the Application of Nanoscale Bilayers Assembly on Stainless Steel Plate to Evaporation Behavior

2013 ◽  
Vol 750-752 ◽  
pp. 2104-2107 ◽  
Author(s):  
Shen Chun Wu ◽  
Chao Tsai Hsu ◽  
Wun Hong Yang ◽  
Dawn Wang ◽  
Hsih Shing Li ◽  
...  
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Steel Plate ◽  
Contact Angles ◽  
Stainless Steel Plate ◽  
Hydrophilic Modification ◽  
Modified Surface ◽  
Surface Modified ◽  
First Time ◽  
The Relationship

This study investigates the use of nanoscale bilayers assembly film for hydrophilic modification on stainless steel plate and observed its effect on the plates evaporation behavior in acetone. This study first establishes the technique of nanoscale bilayers assembly, then performs surface hydrophilic modification on stainless steel plate by changing the surface structure, which produces different contact angles. The relationship between layers (0, 5, 10, 15 bilayers) of surface modified and the contact angle is empirically determined, and results show that, similar to findings stated in the literature [, after surface modification the contact angle decreases from 70° (layer 0) to 24° (layers 15); in addition, the results from this study have demonstrated a certain level of technical capability. This study was investigated the evaporation test in a modified surface , also is the first time reported in previous literature. Evaporation tests show that under the best contact angle evaporation rate can be increased by 50%, indicating the high potential of surface hydrophilic modification on stainless steel plate for improving evaporation behavior.

scholarly journals Influence of moisture content on the contact angle and surface tension measured on birch wood surfaces

2021 ◽  
Author(s):  
Rami Benkreif ◽  
Fatima Zohra Brahmia ◽  
Csilla Csiha
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Moisture Content ◽  
Solid Wood ◽  
Contact Angles ◽  
Surface Moisture ◽  
Wood Coatings ◽  
The Relationship ◽  
Wood Surfaces

AbstractSurface tension of solid wood surfaces affects the wettability and thus the adhesion of various adhesives and wood coatings. By measuring the contact angle of the wood, the surface tension can be calculated based on the Young-Dupré equation. Several publications have reported on contact angle measured with different test liquids, under different conditions. Results can only be compared if the test conditions are similar. While the roles of the drop volume, image shooting time etc., are widely recognized, the role of the wood surface moisture content (MC) is not evaluated in detail. In this study, the effect of wood moisture content on contact angle values, measured with distilled water and diiodomethane, on sanded birch (Betula pendula) surfaces was investigated, in order to find the relationship between them. With increasing MC from approximately 6% to 30%, increasing contact angle (decreasing surface tension) values were measured according to a logarithmic function. The function makes possible the calculation of contact angles that correspond to different MCs.

scholarly journals Effects of bracket design on critical contact angle

2013 ◽  
Vol 83 (5) ◽  
pp. 877-884 ◽  
Author(s):  
Xiaomo Liu ◽  
Peng Ding ◽  
Jiuxiang Lin
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Linear Regression ◽  
Resistance To Sliding ◽  
The Relationship ◽  
State Resistance ◽  
Critical Contact ◽  
Bracket Design

ABSTRACT Objective: To explore how the position of the bracket slots relative to the archwire influences the friction between them, and how bracket design affects the critical contact angle (θc). Materials and Methods: Two kinds of stainless steel archwires (0.016 and 0.019 × 0.025-inch) were tested against four kinds of brackets (Transmission Straight Archwire bracket, Domestic MBT bracket, Tip-Edge Plus bracket, and BioQuick self-ligation bracket) in the dry state. Resistance to sliding (RS) was measured as an increase in contact angle (θ). The value of θc was calculated by two linear regression lines. Results: Friction remained stable when θ < θc, then increased linearly when θ > θc. The θc values of the Tip-Edge Plus bracket and Transmission Straight Archwire bracket were significantly larger than those for the Domestic MBT bracket and BioQuick self-ligation bracket. Conclusions: The relationship between the archwire and bracket slot significantly affects the resistance to sliding. The “edge-off” structure of the Tip-Edge Plus bracket and Transmission Straight Archwire bracket could help to increase the θc value, and to expand the passive configuration range.

scholarly journals Study on the effect of Weber Number to heat transfer of multiple droplets on hot stainless steel surface

2018 ◽  
Vol 154 ◽  
pp. 01114 ◽  
Author(s):  
Aria Riswanda ◽  
Indro Pranoto ◽  
Deendarlianto ◽  
Indarto ◽  
Teguh Wibowo
Keyword(s):  
Stainless Steel ◽  
Surface Temperature ◽  
Weber Number ◽  
Steel Surface ◽  
Cooling System ◽  
Spray Cooling ◽  
Stainless Steel Surface ◽  
Temperature Decrease ◽  
Evaporation Time ◽  
Decrease Rate

Multiple droplets are drops of water that continuously dropped onto a surface. Spray cooling is an application of the use of droplet on a cooling system. Spray cooling is usually used in a cooling system of electronic devices, and material quenching. In this study, correlations between Weber number and surface temperature decrease rate during multiple droplets impingement are investigated and analyzed. Visualization process is used to help determine the evaporation time of droplets impingement by using high speed camera. Induction stove is used to maintain a stainless steel surface temperature at 120°C, 140°C, and 160°C. The Weber number was varied at 15, and 52.5 to simulate low and medium Weber number. The result of this study shows that increase in Weber number does not increase the temperature decrease rate noticeably. Whereas the Weber number decrease the time required for surface temperature to reach its lowest surface temperature. It was also found that for low and medium Weber number, Weber number affect the evaporation time of multiple droplets after impingement.

scholarly journals Layer-by-layer coating of stainless steel plates mediated by surface priming treatment to improve antithrombogenic properties

2016 ◽  
Author(s):  
Irene Carmagnola ◽  
Tiziana Nardo ◽  
Francesca Boccafoschi ◽  
Valeria Chiono
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Platelet Activation ◽  
Colorimetric Assay ◽  
Thrombus Formation ◽  
Human Platelets ◽  
Steel Plates ◽  
Blue Dye ◽  
Layer By Layer

The stainless steel (SS) stents have been used in clinics since 1994. However, typical drawbacks are restenosis and thrombus formation due to limited endothelialisation and hemocompatibility. Surface modification is a smart strategy to enhance antithrombogenicity by promoting endothelialisation. In this work, the layer-by-layer (LbL) technique was applied for coating SS model substrates, after surface priming by functionalisation with 3-aminopropyl triethoxysilane (APTES). A LbL coating made of 14 layers of poly(styrene sulfonate)/poly(diallyldimethylammonium chloride) and heparin as last layer was deposited. FTIR-ATR analysis and contact angle measurements showed that LbL was an effective method to prepare nanostructured coatings. XPS analysis and colorimetric assay employing 1,9-dimethylmethylene blue dye to detect -COOH groups confirmed the successful polyelectrolyte deposition on the coated samples. Preliminary in vitro cell tests, using whole blood and human platelets, were performed to evaluate how surface modification affects platelet activation. Results showed that SS and SS-APTES surfaces induced platelet activation, as indicated by platelet spreading and filopodia formation. After surface modification by LbL coating, the platelets assumed a round shape and no fibrin nets were detected. Data demonstrated that LbL coating is a promising technique to fabricate antithrombogenic surface.

Preparation of Super Hydrophobic Surfaces by the Stainless Steel Wire Mesh as Templates

2012 ◽  
Vol 562-564 ◽  
pp. 56-59 ◽  
Author(s):  
Jian Zhuang ◽  
Meng Meng Du ◽  
Heng Zhi Cai ◽  
Ya Jun Zhang ◽  
Da Ming Wu
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Steel Wire ◽  
Contact Angles ◽  
Wire Mesh ◽  
Stainless Steel Wire ◽  
Hydrophobic Surfaces ◽  
Water Contact ◽  
Stainless Steel Wire Mesh ◽  
Steel Wire Mesh

A facile method for manufacturing super hydrophobic surfaces is presented using the stainless steel wire mesh as templates. The rough surfaces of polymers including polycarbonate, polypropylene and PMMA are prepared with hot embossing on different specifications of stainless steel wire mesh. Scanning electron microscopy (SEM) results reveal that the surfaces roughness of the polymers can be controlled by selecting templates. Contact angle measurement shows that the water contact angles(WCA) rise with the increase of surface roughness, especially, the water contact angle on the PC surfaces prepared with specifications of 635mesh screen can reach to 152.3°, alias super hydrophobic surfaces.

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