scholarly journals Hydrophobicity and Macroscale Tribology Behavior of Stearic Acid/Hydroxypropyl Methylcellulose Dual-Layer Composite

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7707
Author(s):  
Shih-Chen Shi ◽  
Yao-Qing Peng
Keyword(s):  
Stearic Acid ◽  
Double Layer ◽  
Wear Behavior ◽  
Hydroxypropyl Methylcellulose ◽  
Coating Materials ◽  
Abrasive Particles ◽  
Layer Film ◽  
Layer Composite ◽  
Potential Applications ◽  
Layer Thin Film

Hydroxypropyl methylcellulose (HPMC) and stearic acid (SA) are integrated to fabricate a double-layer thin film composite material with potential applications in sustainable packaging and coating materials. The effect of SA concentration on the moisture and wear resistance at the macroscale of the composite are studied. The amount of SA on the surface (>SA5H) is beneficial in increasing anti-wear behavior and reducing the friction coefficient by 25%. The petal-shaped crystals formed by SA are distributed on the surface of the double-layer film, increasing its hydrophobicity. When subjected to wear, the SA crystals on the surface of the double-layer film are fractured into debris-like abrasive particles, forming an optimal third-body of moderate shape and particle size, and imparting anti-wear and lubricating characteristics.

scholarly journals Investigation of Growth Mechanism of Plasma Electrolytic Oxidation Coating on Al-Ti Double-Layer Composite Plate

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 272 ◽  
Author(s):  
Quanzhi Chen ◽  
Weizhou Li ◽  
Kui Ling ◽  
Ruixia Yang
Keyword(s):  
Double Layer ◽  
Growth Mechanism ◽  
Plasma Electrolytic Oxidation ◽  
Composite Plate ◽  
Electrochemical Impedance ◽  
Electric Energy ◽  
Layer Composite ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Coating Growth

The aluminum–titanium (Al-Ti) double-layer composite plate is a promising composite material, but necessary surface protection was required before its application. In this paper, plasma electrolytic oxidation (PEO) was employed to fabricate a ceramic coating on the surface of a Al-Ti double-layer composite plate. To investigate the coating growth mechanism on the Al-Ti double-layer composite plate, a single-Al plate and a single-Ti plate were introduced for comparison experiments. Results showed that, the composite of Al and Ti accelerated the coating growth rate on the part-Ti portion of the composite plate, and that of the part-Al portion was decreased. Electrochemical impedance spectroscopy analysis indicated that the equivalent circuit of the Al-Ti coating was formed by connecting two different circuits in parallel. The reaction behavior revealed that the electric energy during the PEO would leak from the circuit with the weaker blocking effect, and confirmed that the electric energy distribution followed the law of low-resistance distribution. Finally, the mechanism was extended to the PEO treatment on general metal matrix composites to broaden the application theory of the technology.

scholarly journals Flexible electric-double-layer thin film transistors based on a vertical InGaZnO4 channel

RSC Advances ◽  
2021 ◽  
Vol 11 (29) ◽  
pp. 17910-17913
Author(s):  
Liuhui Lei ◽  
Yuanyuan Tan ◽  
Xing Yuan ◽  
Wei Dou ◽  
Jiale Zhang ◽  
...  
Keyword(s):  
Thin Film ◽  
Double Layer ◽  
Electric Double Layer ◽  
Thin Film Transistors ◽  
Room Temperature ◽  
Layer Thin Film

Flexible electric-double-layer (EDL) thin film transistors (TFTs) based on a vertical InGaZnO4 (IGZO) channel are fabricated at room temperature.

Investigations on the Effect of Coating Material and Method on Die Wear in Stamping of Advanced High Strength Steels

2013 ◽  
Author(s):  
Ömer Necati Cora ◽  
Muammer Koç ◽  
Peter J. Blau ◽  
Kunio Namiki
Keyword(s):  
Wear Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Test Method ◽  
Coating Materials ◽  
Advanced High Strength Steels ◽  
Die Wear ◽  
Die Life ◽  
Metalworking Industry ◽  
Width Measurements

Despite the advantages of advanced high strength steels (AHSS), their stamping into functional lightweight parts demands prolonged die life, which necessitates the use of alternative substrates, coating materials, and/or surface conditioning to minimize and delay the die wear. In order to avoid frequent die replacement and surface quality problems on the stamped parts, the metalworking industry has been investigating various approaches such as reducing/refining the carbide particles, adding alloying elements, and elevating the hardness and toughness values for both substrate materials and coatings. The objective of this work was to investigate the effects of different coatings on the wear behavior of a some selected tool steel materials (die sample of interest) against two different AHSS sheet blanks through a cylinder-on-flat type reciprocating test method. After wear tests, both die sample and sheet blank surface were microscopically examined. Wear resistance of the slider was quantified from wear scar width measurements. Results showed that TD and CVD coated die samples performed better than the two other PVD coated samples.

Thermal Characterizations of HPMC/PVA Impregnated with CNC Electrospun Nanofibers

2020 ◽  
Vol 981 ◽  
pp. 115-120
Author(s):  
Etdal Bakhiet ◽  
Siti Fazira Samsudin ◽  
Farah Hanani Zulkifli ◽  
Aizi Nor Mazila Ramli
Keyword(s):  
Hydroxypropyl Methylcellulose ◽  
Electrospun Nanofibers ◽  
Maximum Temperature ◽  
Poly Vinyl Alcohol ◽  
Electrospun Nanofiber ◽  
Random Orientation ◽  
Electrospinning Technique ◽  
Peak Intensity ◽  
Major Weight Loss ◽  
Potential Applications

Interest in the nanotechnology invention has been increased among the researcher and industries which lead to many investigations and studies to develop a product with better performance. In this research, hydroxypropyl methylcellulose (HPMC) and poly (vinyl) alcohol (PVA) nanofiber with the ratio 1:1 and the concentration of 5 wt% and 7 wt%, respectively, were successfully fabricated by using electrospinning technique. The HPMC/ PVA was then blended with the different concentration of cellulose nanocrystal (CNC) at 2 wt%, 4 wt%, 6 wt% and 8 wt%. The SEM results of HPMC/PVA/CNC nanofibers shown random orientation fibers with average diameters of 62.28 nm - 252.80 nm. The TGA results showed three major weight loss that prove the decomposotion of HPMC/PVA/CNC was occured with three maximum temperature peaks around 69 °C, 290 °C and 392 °C. As for DSC, the peak intensity of the Tg in the electrospun nanofiber are decreasing as the concentration of CNCs increased might be due to the interfering of the CNC with the crystallization of the polymer causing mobility of the amorphous regions to be higher. Therefore, the study on the thermal properties of HPMC/PVA incorporated with CNCs nanofibers could be a reference for various potential applications.

Transient security transistors self-supported on biodegradable natural-polymer membranes for brain-inspired neuromorphic applications

Nanoscale ◽  
2018 ◽  
Vol 10 (31) ◽  
pp. 14893-14901 ◽  
Author(s):  
Wennan Hu ◽  
Jie Jiang ◽  
Dingdong Xie ◽  
Shitan Wang ◽  
Kaixi Bi ◽  
...  
Keyword(s):  
Thin Film ◽  
Sodium Alginate ◽  
Double Layer ◽  
Electric Double Layer ◽  
Thin Film Transistor ◽  
Electronic Devices ◽  
Polymer Membranes ◽  
Natural Polymer ◽  
Layer Thin Film

Physically transient neuromorphic electronic devices are proposed using an AZO electric-double-layer thin-film transistor self-supported on biodegradable sodium alginate membranes.

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