scholarly journals Effect of ITO Content on Properties of Functional Graphene Coating on Cotton Fabric

2021 ◽  
Vol 2109 (1) ◽  
pp. 012016
Author(s):  
Yongqiang Yang ◽  
Ting Ye ◽  
Qun Wang ◽  
Weiyi Han ◽  
Qinsheng Wang ◽  
...  
Keyword(s):  
Cotton Fabric ◽  
Indium Tin Oxide ◽  
Graphene Sheets ◽  
Infrared Reflectance ◽  
Curing Time ◽  
Functional Coatings ◽  
Functional Coating ◽  
Infrared Reflectivity ◽  
Graphene Coating ◽  
Uv Transmittance

Abstract In order to investigate the effect of indium tin oxide (ITO) on the performance of graphene functional coating on cotton fabric, different contents of ITO were added to the graphene coating system, and the effects of ITO content and curing time on various properties of graphene coating were studied. The results showed that the ITO particles adsorbed on the graphene sheets and filled the gaps between the graphene sheets, forming a dense conductive network, which could further improve the conductive performance of the functional coatings. When ITO content was 1.2%, the resistivity of the coating reached the lowest 1.8 Ω·cm, and the overall ultraviolet transmittance and reflectance were the lowest. With the increase of ITO content, the infrared reflectance will first decrease and then slowly increase, but the infrared reflectance is all below 0.5%. When the curing time reached 90 s, the resistivity and UV transmittance of cotton fabric coating decreased. With the extension of curing time, the coating on infrared reflectivity gradually increased, but the infrared reflectivity of the overall < 1%.

Repair of Water Turbine Blades by Wire Electric Arc Spraying

1996 ◽  
Author(s):  
J. Musil ◽  
V. Dolhof ◽  
E. Dvorácek
Keyword(s):  
Stainless Steel ◽  
Turbine Blades ◽  
Electric Arc ◽  
Francis Turbine ◽  
Arc Spraying ◽  
Original Material ◽  
Functional Coatings ◽  
Functional Coating ◽  
Water Turbine ◽  
Stainless Steel Coatings

Abstract Water turbine parts damaged by cavitation erosion (CE) and/or slurry erosion (SE) may cause excessive operational costs for plants worldwide. The damages can be reduced by choosing more resistant materials and right technology in the first-production or at repair and overhaul. Thermal spray technologies have a great potential in the field of repairing works. Thick multilayered coatings deposited by wire electric arc spraying (WAS) has been developed and applied as CE and SE protection at the repair of stationary Francis turbine blades. Repair technology by WAS was performed on large eroded areas (1-3 m3) of preguide blades of Francis turbine: 1) local damaged depths 30-35 mm maximum were repaired by sprayed materials, 2) subsequently wire arc spraying of functional coating was applied. Three types of functional coatings with total thickness 10 mm a) duplex high - Cr stainless steel with NiAl bond coat, b) graded NiAl - Cr stainless steel coatings, and c) multilayered graded NiAl - Cr stainless steel coatings were compared by means of stress measurements and structural analysis. The coating structure influences very strongly the residual stress level and adhesive-cohesive strength. Multilayered graded NiAl - Cr stainless steel coatings showed the best results and were sprayed on water turbine blades in 4 Czech water power station during regular cut-off repair periods. After 30 - 36 months' continuous operation, Francis turbine blades repaired by WAS technology show better behaviour in comparison with original material from the point of wear resistance, reliability, cost-effect and life-time.

Green natural dye from Buddleja officinalis and its ultrasonic dyeing on cotton fabric

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guizhen Ke ◽  
Ziying Zhao ◽  
Chen Shuhui ◽  
Jianqiang Li
Keyword(s):  
Cotton Fabric ◽  
Ph Value ◽  
Cotton Fabrics ◽  
Natural Dye ◽  
Color Strength ◽  
Content Type ◽  
Washing Fastness ◽  
Uv Transmittance ◽  
Protection Capability ◽  
Ultrasonic Conditions

Purpose The purpose of this paper is to explore a new eco-friendly green textile dyeing. Natural plant Buddleja officinalis is traditionally used as yellow pigment addition in rice. It is worth developing its application and dyeing performance in cotton fabric. Design/methodology/approach Buddleja officinalis dried flower was extracted with ethanol aqueous. The extraction conditions including ethanol concentration, material to liquor ratio, extract time and temperature were optimized. Then cotton fabrics were dyed with Buddleja officinalis extraction under conventional and ultrasonic conditions. The effects of dyeing time, bath ratio, pH value of dyeing bath, dyeing temperature and mordants on K/S values were studied and the resulting color strength obtained by conventional and ultrasonic dyeing were compared. The ultraviolet (UV) transmittance of Buddleja officinalis dyed cotton fabric was also evaluated. Findings The color strength of the fabric dyed with Buddleja officinalis under ultrasonic conditions was higher than that under conventional conditions. Alum, Fe and Cu as simultaneous mordants improved the K/S value of the dyed cotton fabrics. Both washing fastness and rubbing fastness were fairly good in all Buddleja officinalis dyed cotton fabrics, washing fastness = 3–4 and rubbing fastness = 4. What’s more, the dyed cotton fabrics showed lower transmittance values as compared to undyed cotton fabrics and indicated potential UV protection capability. Practical implications Buddleja officinalis can be a new natural dye source for the ultrasonic dyeing of cotton fabric. Originality/value It is for the first time that Buddleja officinalis is used as a natural dye in cotton fabric dyeing with less water and the dyeing using ultrasound has been found to have an obvious improvement in the color strength and color-fastness.

scholarly journals Surface Modified Techniques and Emerging Functional Coating of Dental Implants

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1012
Author(s):  
Heng Dong ◽  
Hui Liu ◽  
Na Zhou ◽  
Qiang Li ◽  
Guangwen Yang ◽  
...  
Keyword(s):  
Dental Implants ◽  
Alveolar Bone ◽  
Functional Coatings ◽  
Implant Surface ◽  
Functional Coating ◽  
Bioactive Coatings ◽  
Coating Methods ◽  
Surface Modified ◽  
Related Proteins ◽  
Physical And Chemical

Dental implants are widely used in the field of oral restoration, but there are still problems leading to implant failures in clinical application, such as failed osseointegration, marginal bone resorption, and peri-implantitis, which restrict the success rate of dental implants and patient satisfaction. Poor osseointegration and bacterial infection are the most essential reasons resulting in implant failure. To improve the clinical outcomes of implants, many scholars devoted to modifying the surface of implants, especially to preparing different physical and chemical modifications to improve the osseointegration between alveolar bone and implant surface. Besides, the bioactive-coatings to promote the adhesion and colonization of ossteointegration-related proteins and cells also aim to improve the osseointegration. Meanwhile, improving the anti-bacterial performance of the implant surface can obstruct the adhesion and activity of bacteria, avoiding the occurrence of inflammation related to implants. Therefore, this review comprehensively investigates and summarizes the modifying or coating methods of implant surfaces, and analyzes the ossteointegration ability and anti-bacterial characteristics of emerging functional coatings in published references.

scholarly journals Cross-Linking Strategies for Fluorine-Containing Polymer Coatings for Durable Resistant Water- and Oil-Repellency

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 723
Author(s):  
Julia Kredel ◽  
Deborah Schmitt ◽  
Jan-Lukas Schäfer ◽  
Markus Biesalski ◽  
Markus Gallei
Keyword(s):  
Textile Industry ◽  
Uv Light ◽  
Tensile Elongation ◽  
Water Repellency ◽  
Ethyl Acrylate ◽  
Polymer Coatings ◽  
Cross Linking ◽  
Functional Coatings ◽  
Functional Coating ◽  
The Cross

Functional coatings for application on surfaces are of growing interest. Especially in the textile industry, durable water and oil repellent finishes are of special demand for implementation in the outdoor sector, but also as safety-protection clothes against oil or chemicals. Such oil and chemical repellent textiles can be achieved by coating surfaces with fluoropolymers. As many concerns exist regarding (per)fluorinated polymers due to their high persistence and accumulation capacity in the environment, a durable and resistant coating is essential also during the washing processes of textiles. Within the present study, different strategies are examined for a durable resistant cross-linking of a novel fluoropolymer on the surface of fibers. The monomer 2-((1,1,2-trifluoro-2-(perfluoropropoxy)ethyl)thio)ethyl acrylate, whose fluorinated side-chain is degradable by treatment with ozone, was used for this purpose. The polymers were synthesized via free radical polymerization in emulsion, and different amounts of cross-linking reagents were copolymerized. The final polymer dispersions were applied to cellulose fibers and the cross-linking was induced thermally or by irradiation with UV-light. In order to investigate the cross-linking efficiency, tensile elongation studies were carried out. In addition, multiple washing processes of the fibers were performed and the polymer loss during washing, as well as the effects on oil and water repellency were investigated. The cross-linking strategy paves the way to a durable fluoropolymer-based functional coating and the polymers are expected to provide a promising and sustainable alternative to functional coatings.

Modeling and Optimization of Durable Press Finishing of Cotton Fabric with BTCA by Response Surface Methodology

2020 ◽  
Vol 7 (4) ◽  
pp. 37-44
Author(s):  
Xudong Chu ◽  
Huaifang Wang ◽  
Shuying Sui ◽  
Ping Zhu ◽  
Qingdao University
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Cotton Fabric ◽  
Breaking Strength ◽  
Retention Rate ◽  
Curing Temperature ◽  
Sodium Hypophosphite ◽  
Significant Variable ◽  
Curing Time ◽  
Durable Press

Durable press (DP) finishing process of cotton fabric with 1,2,3,4-butanetetracarboxylic acid (BTCA) was investigated and optimized using the Box-Behnken design (BBD) with a response surface methodology (RSM). BBD experimental data were fitted to create the response surface regression models describing wrinkle recovery angle (WRA) and breaking strength of the finished cotton fabric. Analysis of variance (ANOVA) revealed that the concentration of BTCA was the most significant variable affecting the WRA, followed by the curing time, curing temperature, and concentration of sodium hypophosphite (SHP). Regarding breaking strength, curing time was the most significant variable, followed by the curing temperature, concentration of BTCA, and concentration of SHP. After optimal treatment, the WRA of the finished fabric was 252°, while the retention rate of breaking strength was 69%.

Novel Functional Coating: Luminescent Coating

2011 ◽  
Vol 337 ◽  
pp. 37-40 ◽  
Author(s):  
Li Ping Liu ◽  
Xue Feng Yan ◽  
Zhi Ming Zhang ◽  
Liang Min Yu
Keyword(s):  
Energy Storage ◽  
21St Century ◽  
Future Development ◽  
Functional Coatings ◽  
Functional Coating ◽  
The Future ◽  
Luminescent Coating ◽  
Development Tendency ◽  
Research Situation ◽  
At Home

The luminescent coating as one of the special functional coatings of the 21st century has attracted a great deal of attention recently. Luminescent coating is divided into three categories: fluorescent coating, self-luminous coating, energy storage luminescent coating. The article briefly summarizes their principles and luminous characteristics. And mainly reviews the present research situation, the future development tendency and their widely applications both at home and abroad.

The analysis of ways to increase the durability of shut-off valves loaded elements

2021 ◽  
Vol 6 (3) ◽  
pp. 225-235
Author(s):  
Islam A. Alexandrov ◽  
Alexander N. Muranov ◽  
Maxim S. Mikhailov
Keyword(s):  
Wear Resistance ◽  
Surface Modification ◽  
Structural Phase ◽  
Oil And Gas Industry ◽  
Vacuum Arc ◽  
Technical Equipment ◽  
Functional Coatings ◽  
Functional Coating ◽  
Mechanical Methods ◽  
Contact Surfaces

This review analyzes the problems caused by heavy wear of loaded friction elements of structures, which is typical of almost all industries. This implies the importance of solving problems of increasing their durability. Of particular relevance is the need to solve the problem of improving wear resistance of contact surfaces of special-purpose shut-off valves, being an irreplaceable component of technical equipment used in the oil and gas industry as well as processing industries, nuclear energy, and medicine. It is shown that the effectiveness of solving problems of increasing durability of equipment is largely associated with additional standard processing of loaded friction elements of such structures, and with the improvement of technologies for increasing wear resistance and strength characteristics of their contact surfaces. The analysis of the possibilities of increasing wear resistance by mechanical methods of surface treatment, as well as by methods of surface modification through various functional coatings has been made. It is substantiated that the vacuum-arc method of ion-plasma spraying of a multilayer nanocomposite coating is the most promising way of creating a functional coating to increase the wear resistance of valves. Widespread industrial introduction of the method of beam surface modification of materials makes it possible to obtain such structural-phase states of materials, which are not possible with traditional methods.

High Velocity Thermal Spraying of Powders and Suspensions Containing Micron, Submicron and Nanoparticles for Functional Coatings

2012 ◽  
Vol 533 ◽  
pp. 99-114 ◽  
Author(s):  
A. Killinger ◽  
R. Gadow
Keyword(s):  
High Velocity ◽  
Liquid Fuel ◽  
Thermal Spraying ◽  
Flame Spraying ◽  
Powder Materials ◽  
Coating Properties ◽  
Functional Coatings ◽  
Functional Coating ◽  
Refined Microstructure ◽  
Application Fields

Thermal Spraying of submicron and nanoscaled powder materials require the application of agglomerated powders that can be processed with standard HVOLF (High Velocity Oxy Liquid Fuel Flame Spraying) equipment, or the conversion of these powders into a finely dispersed suspension together with an organic solvent, appropriate for suspension spraying (HVSFS: High Velocity Suspension Flame Spraying). Both methods are suitable for the manufacturing of finely structured and dense coatings and offer new possibilities in functional coating development for new application fields. Due to their refined microstructure, mechanical and physical coating properties can differ significantly from their conventionally sprayed counterparts. The paper gives an overview of HVOLF sprayed WC-Co cermets containing submicron and nanocarbides and HVSF sprayed nanooxide ceramics used in numerous technical applications.

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