Effects of O2 and H2O on TiO2 photocatalytic mass loss self-cleaning efficiency for thin hydrocarbons layers

2021 ◽  
Vol 421 ◽  
pp. 113510
Author(s):  
Théo Henry ◽  
Paolo Martins ◽  
Etienne Eustache ◽  
Bernard Servet ◽  
Laurent Divay ◽  
...  
Keyword(s):  
Mass Loss ◽  
Cleaning Efficiency ◽  
Self Cleaning

scholarly journals Investigating the effect of self-cleaning treatment on the air permeability, stain removal and water repellency properties of functionalized double jacquard woven upholstery fabrics

2019 ◽  
Vol 70 (06) ◽  
pp. 512-518
Author(s):  
DUYGU YAVUZKASAP AYAKTA ◽  
NAZLI ÇAĞLAR CİNPERİ ◽  
HAKAN ÖZDEMİR
Keyword(s):  
Raw Materials ◽  
Sol Gel ◽  
Water Repellency ◽  
Air Permeability ◽  
Woven Fabrics ◽  
Cleaning Efficiency ◽  
Nano Tio2 ◽  
Stain Removal ◽  
Self Cleaning ◽  
Weave Pattern

Self-cleaning is the important and required function for the upholstery fabrics. At this research, which was not studied in the references, nano TiO2 coating was appliqued on 18 double faced woven fabrics produced with jacquard weaving technique with three different weft density, two different raw materials of warp yarns that are polyester and rayon, three different face weave pattern under the same conditions by using sol-gel method. All fabrics were stained with the same amount of coffee. Self-cleaning efficiency of the applied fabrics were tested at spectrophotometer by using K/S (Colour/Strength) values after waiting 6, 12 and 24 hours under artificial sunlight and stain removal ratios were calculated. The effects of the fibre type, weft setting and weave pattern on the air permeability of upholstery fabrics were investigated by variance analysis by means of Minitab 17.0. TiO2 application caused air permeability reduction of 18‒40% in polyester warp fabrics and 30‒47% in rayon warp fabrics. It was seen that self-cleaning property can be got at double faced polyester/cotton and rayon/cotton fabrics by using nano TiO2. After 24 hours sunlight exposure, the average stain removal rates were found as 74.8% for polyester warp fabrics and 66.7% for rayon warp fabrics. Also, it has been observed that TiO2 application imparts hydrophobic properties to all rayon and polyester warp fabrics.

Novel antifouling polymer with self-cleaning efficiency as surface coating for protein analysis by electrophoresis

Talanta ◽  
2021 ◽  
Vol 221 ◽  
pp. 121493 ◽  
Author(s):  
Fang Wang ◽  
Hailin Cong ◽  
Jie Xing ◽  
Song Wang ◽  
Youqing Shen ◽  
...  
Keyword(s):  
Surface Coating ◽  
Protein Analysis ◽  
Cleaning Efficiency ◽  
Self Cleaning

Self-cleaning effect of electrospun poly (1,4-cyclohexanedimethylene isosorbide terephthalate) nanofibers embedded with zinc oxide nanoparticles

2017 ◽  
Vol 88 (21) ◽  
pp. 2493-2498 ◽  
Author(s):  
Muhammad Qamar Khan ◽  
Hoik Lee ◽  
Jun Mo Koo ◽  
Zeeshan Khatri ◽  
Jianhua Sui ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Irradiation Time ◽  
Cleaning Efficiency ◽  
Transmission Electron ◽  
Uniform Dispersion ◽  
Ft Ir ◽  
Self Cleaning ◽  
Ft Ir Spectroscopy

This study examined the photocatalytic self-cleaning of novel nanofibers of co-polyester poly(1,4-cyclohexanedimethylene isosorbide terephthalate) (PICT). To obtain the self-cleaning property, zinc oxide (ZnO) nanoparticles were blended into the solution of PICT at five different concentrations. The morphology of the nanofibers was analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the degradation spectrum of the target dyes was confirmed by Fourier Transform Infrared (FT-IR) spectroscopy. Especially in the TEM images, there was clear evidence of a uniform dispersion of the ZnO nanoparticles embedded in the nanofibers. As the concentration of ZnO increased to 9 wt%, there was a greater dispersion of the ZnO nanoparticles on the nanofibers. The photocatalytic activity indicated that more efficient self-cleaning occurred at an irradiation time of 3 hours and a 9% concentration of ZnO nanoparticles in the nanofibers. We achieved around 99% self-cleaning efficiency from these nanofibers.

Applied Research of Titanium Oxide to Seal the Anodized Al Alloy

2011 ◽  
Vol 183-185 ◽  
pp. 1621-1625
Author(s):  
Qi Zhou ◽  
Xin Wang ◽  
Li Fang Zhang ◽  
Chun Lin He ◽  
Qing Kui Cai ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Saline Water ◽  
Three Dimensional ◽  
Al Alloy ◽  
Technological Parameters ◽  
Cleaning Efficiency ◽  
Confocal Scanning ◽  
Alumina Sol ◽  
Self Cleaning ◽  
Surface Morphologies

The anodized Al alloy films are sealed in the alumina sol with anatase type of titanium oxide.Coloration experiment; acid drip test and self-cleaning efficiency are used as evaluation criterions. Orthogonal test of sol sealed films and Two Factor test are used to value the influence of technological parameters on properties of the sealed films. The results show that the corrosion resistance of sealed film doped with TiO2 was superior to that of without in neutral saline water. Three-dimensional surface morphologies obtained by OLS3100 laser confocal scanning microscope (LSCM ) show that the sealed films with are smoother than ones without TiO2 and its pits in the sealed film are less. The sealed films with TiO2 have both corrosion resistance and self-cleaning effect.

scholarly journals Preparation and characterization of protective self-cleaning TiO2/kaolin composite coating

2018 ◽  
Vol 68 (331) ◽  
pp. 163
Author(s):  
V. Jovanov ◽  
V. Zečević ◽  
T. Vulić ◽  
J. Ranogajec ◽  
E. Fidanchevska
Keyword(s):  
Photocatalytic Activity ◽  
Composite Coating ◽  
Building Materials ◽  
Support Surface ◽  
Tio2 Content ◽  
Cleaning Efficiency ◽  
Before And After ◽  
Self Cleaning ◽  
Highly Porous

The application of self-cleaning coatings presents one of the most effective ways to protect the surfaces of the building materials. The effect of TiO2/kaolin based coatings applied to three types of substrates: non-porous, porous and highly porous, was investigated. Mechanical activation was applied for the impregnation of the active TiO2 component (in content of 3 and 10 wt. %) into the kaolin support. Surface properties (roughness, hydrophilicity and micro-hardness) and functional properties (photocatalytic activity and self-cleaning efficiency) were studied in order to define the optimal formulation of the applied coatings. The effect of the photocatalytic behavior of the coated substrates in terms of self-cleaning ability was assessed by the photodegradation of Rhodamine B, performed before and after durability tests. The results obtained in this paper showed that photocatalytic activity of the TiO2/kaolin composite coating generally depends on the procedure of TiO2 impregnation into the kaolin clay and the loaded TiO2 content.

scholarly journals Self-cleaning efficiency of titanium dioxide surface under simultaneous UV irradiation of various intensities and water flow

2014 ◽  
Vol 122 (1426) ◽  
pp. 513-516 ◽  
Author(s):  
Shunsuke NISHIMOTO ◽  
Sana TOMOISHI ◽  
Yoshikazu KAMESHIMA ◽  
Eiji FUJII ◽  
Michihiro MIYAKE
Keyword(s):  
Titanium Dioxide ◽  
Water Flow ◽  
Uv Irradiation ◽  
Cleaning Efficiency ◽  
Titanium Dioxide Surface ◽  
Self Cleaning

Self-Cleaning of Photocatalytic Mortar with Glass Aggregate and Calcium Sulfoaluminate-Belite Cement

2019 ◽  
Vol 2673 (11) ◽  
pp. 704-715
Author(s):  
Aniruddha Baral ◽  
Jeffery R. Roesler
Keyword(s):  
Fly Ash ◽  
Surface Characteristics ◽  
Cementitious Materials ◽  
The Self ◽  
Fine Aggregate ◽  
Cleaning Efficiency ◽  
Solution Ph ◽  
Calcium Sulfoaluminate ◽  
Self Cleaning ◽  
Belite Cement

The self-cleaning performance and mechanism of photocatalytic mortars with different cementitious materials and aggregates was evaluated through a rhodamine B (RhB) degradation test. The self-cleaning property of photocatalytic concrete helps to preserve its aesthetics, NOx removal potential, and surface reflectance. In this study, the addition of TiO2 to calcium sulfoaluminate-belite cement (CSAB) demonstrated a self-cleaning potential like ordinary Portland cement (OPC). Photocatalytic mortar mixes with OPC demonstrated increased self-cleaning efficiency with glass fine aggregate and with higher TiO2 content. However, glass addition was not effective in improving the self-cleaning efficiency of CSAB mortar with TiO2. Replacement of OPC with class F fly ash significantly decreased self-cleaning efficiency. The decrease in pore solution pH with fly ash replacement of OPC or CSAB cement instead of OPC was hypothesized as the cause for the decline in self-cleaning efficiency. An experiment to study the photocatalytic degradation rate of RhB revealed that it increased with higher pH. RhB photocatalytically degrades through N-de-ethylation and cleavage of the chromophore structure depending on the reaction surface characteristics with the first path investigated in this paper. It was shown that some of the RhB on the photocatalytic mortar surface was degraded by the N-de-ethylation path regardless of the cement and aggregate constituents and increasing TiO2 (anatase) content increased RhB degradation through N-de-ethylation.

scholarly journals The Function of Cross Linker Carboxylic Acid for TiO2/Chitosan/SiO2 Coated as Self Cleaning Fabrics

2018 ◽  
Vol 34 (6) ◽  
pp. 2942-2947
Author(s):  
Yetria Rilda ◽  
Syukri Syukri ◽  
Desi Ferlinda ◽  
Anessa Iasa ◽  
Anthoni Agustien
Keyword(s):  
Carboxylic Acid ◽  
Cotton Fiber ◽  
Spherical Shape ◽  
The Self ◽  
Intensity Change ◽  
Cross Link ◽  
Cleaning Efficiency ◽  
Covalent Interaction ◽  
Cross Linker ◽  
Self Cleaning

The chemical compound TiO2/Chitosan/SiO2 is a photocatalyst with a self- cleaning capability against dye contaminations. Morphologically, it has an anatase structure with 13.1 nm of crystallite size, spherical shape, and Eg = 3.209 eV as characterized by X-ray diffraction, TEM, and UV-DRS. The self-cleaning capability of TiO2/Chitosan/SiO2 against the malachite green dye spot was optimized using two carboxylic acid cross-linkers namely 1,2,3,4- Buthane Tetra Carboxylic Acid (BTCA) and Chloro Acetic Acid (CAA). The optimization in enhanced the growth of ester covalent interaction with the functional groups of textile fiber was performed gradually in CAA and directly in BTCA to produce a self-cleaning textile. The self-cleaning efficiency of cross-linker under the UV irradiation (536 lux for 60 min) was 96% and 69.96% in CAA and BTCA, respectively. The FT-IR analysis revealed that the ester covalent interaction among the cross-linker, cotton fiber, and TiO2/chitosan/SiO2 nanocluster could be determined by the intensity change of C=O stretching of the functional group at 1700-1710 cm-1. The intensity was higher in CAA (15.03%) than BTCA cross-link (12.04%). The superficial morphological feature of the cotton fiber as observed by SEM depicted that TiO2/chitosan/SiO2 particles were dispersed more evenly in the CAA than BTCA. The TiO2/chitosan/SiO2 nanocluster with a CAA cross-link is reliable to be used indesigning a high-quality self-cleaning textile.

Self-Cleaning Efficiency of Artificial Superhydrophobic Surfaces

Langmuir ◽  
2009 ◽  
Vol 25 (5) ◽  
pp. 3240-3248 ◽  
Author(s):  
Bharat Bhushan ◽  
Yong Chae Jung ◽  
Kerstin Koch
Keyword(s):  
Superhydrophobic Surfaces ◽  
Cleaning Efficiency ◽  
Self Cleaning

A deeper understanding on the motion behaviors of wire during ultrasonic wedge-wedge bonding process

2016 ◽  
Vol 2016 (1) ◽  
pp. 000427-000432 ◽  
Author(s):  
Yangyang Long ◽  
Folke Dencker ◽  
Marc Wurz ◽  
Armin Feldhoff ◽  
Jens Twiefel
Keyword(s):  
Relative Motion ◽  
Physical Vapor Deposition ◽  
Central Area ◽  
Bonding Process ◽  
Cleaning Efficiency ◽  
Substrate Interface ◽  
Self Cleaning ◽  
The Wire ◽  
Aluminum Oxide Layer ◽  
Wedge Bonding

Abstract Ultrasonic wire bonding is a dominating interconnection technique that has been applied in packaging industry for decades. The phenomena at the wire/substrate interface and the wire/tool interface, however, are not clear yet. Specifically, the motion behaviors of the wire during the bonding process have to be deeply understood. In this project, the relative motion amplitudes at the wire/tool interface and the self-cleaning efficiency at the wire/substrate interface are investigated via the analysis of an artificially coated layer. For each experiment, a thin layer made of a specific material was coated onto the surface of a 400 μm wire by physical vapor deposition. The change of thicknesses of the layer was observed by a scanning electron microscope after the bonding process. The results indicated a complex relative motion behavior at the wire/tool interface. The relative motion amplitude at the fillets contact regions is higher than that at the other contact perimeter regions while the amplitude at the central area is the lowest. The insignificant influence of a 200 nm aluminum oxide layer on the bonding quality demonstrated the high self-cleaning efficiency of the wedge-wedge bonding process.

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