dip coating technique
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2021 ◽  
Vol 7 (12) ◽  
pp. 155
Author(s):  
Zorayda Lazcano-Ortiz ◽  
Cesar L. Ordóñez-Romero ◽  
Jorge Luis Domínguez-Juárez ◽  
Guillermo Monsivais ◽  
Rafael Quintero-Torres ◽  
...  

In this article, we describe a magnonic crystal formed by magnetite nanoparticles. The periodic strip-like structure of the nanoparticles was fabricated on the surface of thin yttrium iron garnet single-crystal film grown on a gallium–gadolinium garnet substrate via dip-coating techniques. It was shown that such periodic structure induces the formation of the bandgaps in the transmission spectra of magnetostatic surface spin-waves (MSSW). The structure was simulated by the transfer matrix method. Spin-wave detection has been carried out by using a pair of microwave antennas and a vector network analyzer.


Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7125
Author(s):  
Magdalena Zięba ◽  
Katarzyna Wojtasik ◽  
Cuma Tyszkiewicz ◽  
Ewa Gondek ◽  
Jacek Nizioł ◽  
...  

Crack-free binary SiOx:TiOy composite films with the refractive index of ~1.94 at wavelength 632.8 nm were fabricated on soda-lime glass substrates, using the sol–gel method and dip-coating technique. With the use of transmission spectrophotometry and Tauc method, the energy of the optical band gap of 3.6 eV and 4.0 eV were determined for indirect and direct optical allowed transitions, respectively. Using the reflectance spectrophotometry method, optical homogeneity of SiOx:TiOy composite films was confirmed. The complex refractive index determined by spectroscopic ellipsometry confirmed good transmission properties of the developed SiOx:TiOy films in the Vis-NIR spectral range. The surface morphology of the SiOx:TiOy films by atomic force microscopy (AFM) and scanning electron microscopy (SEM) methods demonstrated their high smoothness, with the root mean square roughness at the level of ~0.15 nm. Fourier-transform infrared (FTIR) spectroscopy and Raman spectroscopy were used to investigate the chemical properties of the SiOx:TiOy material. The developed binary composite films SiOx:TiOy demonstrate good waveguide properties, for which optical losses of 1.1 dB/cm and 2.7 dB/cm were determined, for fundamental TM0 and TE0 modes, respectively.


2021 ◽  
Vol 22 (48) ◽  
Author(s):  
Ram Phul Yadav ◽  
Krishana Bahadur Rai ◽  
Shankar Prasad Shrestha

Undoped and Aluminum doped Zinc Oxide thin films were synthesized by dip coating technique. The electrical properties of the films were studied due to the Aluminum doping, starting solution aging and sample aging. The sheet resistance of ZnO:Al films was minimum at 2.5 at % whereas carrier concentration is maximum. Both undoped and aluminum doped Zinc Oxide thin films were found to be highly transparent lying in between 65 - 79 % in the wavelength range 367 nm to 1038 nm. The band gap of deposited films changed slightly from 3.22 eV to 3.27 eV.


Author(s):  
Zorayda Lazcano-Ortiz ◽  
Cesar L. Ordóñez-Romero ◽  
Jorge Luis Domínguez-Juárez ◽  
Guillermo Monsivais Monsivais ◽  
Rafael Quintero-Torres ◽  
...  

In this article, we show theoretically and experimentally the formation of spin-waves band gaps in a magnonic crystal that was implemented by the deposition of periodic micro-structured strips of magnetite nanoparticles. A theoretical model describing the spectra of the transmitted spin-waves bandgaps is proposed. This is achieved using a simple model based on microwave transmission line theory and considering the presence of micro-structured strips of magnetite nanoparticles on the surface. Such magnonic crystal of equally spaced micro-structured strips of magnetite nanoparticles on the surface of an yttrium iron garnet thin film has been implemented and measured. The periodic micro-structured nanoparticles are deposited on the surface of such yttrium iron garnet single-crystal film grown on a gallium-gadolinium garnet substrate via dip-coating technique. Propagation of magnetostatic surface spin-waves is studied and it is shown that the presence of such periodic structure leads to the formation of spin-wave band gaps in the transmission characteristics. The spin-wave detection has been carried out using a pair of microwave antennas and a vector network analyzer. The results show that the periodic structure formed by the magnetite strips modifies the spectra of the transmitted spin waves producing band gaps.


2021 ◽  
Author(s):  
Thaisa Ribeiro ◽  
Mylena Rangel da Silva ◽  
Geanni B. da Silveira e Silva Pessanha ◽  
Elisangela Pimentel da Silva

Corrosion is an electrochemical or chemical process that causes the deterioration of materials, especially metallic ones, thereby leading to unpredictable negative consequences. The application of anti-corrosive coatings constitutes a means of minimizing such corrosive effects once these coatings act as barriers between the substrate and the corrosive medium. Graphene oxide is a material that has gained notoriety due to its properties, abundance and to the fact that it is environmental friendly. The work we developed aimed to apply a graphene oxide solution on a metallic substrate in order to verify its applicability as an anticorrosive film. For this purpose, the production of the precursor solution was carried out; the application of the solution was accomplished by the dip-coating technique; then, the immersion test in aqueous corrosive medium followed and the characterization by confocal microscopy was performed. The results showed that there was adhesion of the film to the substrate and that it remained insoluble. As a protective layer for anticorrosion coating, the film responded partially well to this study’s proposed objectives because, though it did not manage to slow down the corrosive process, it did minimize the formation of spot corrosion, a more aggressive form of corrosion.


KOVALEN ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 121-130
Author(s):  
Thamrin Azis ◽  
Maulidiyah Maulidiyah ◽  
Muhammad Nurdin ◽  
Muh. Zakir Muzakkar ◽  
Ratna ◽  
...  

The manufacture of titanium dioxide (TiO2) electrodes is made by anodizing method and coated with ilmenite (FeTiO3) through a dip-coating technique. The ilmenite (FeTiO3) coated TiO2/Ti plate electrode was developed for the degradation of the reactive blue 160 dye under photoelectrocatalytic UV and Visible light irradiation. The performance of FeTiO3-TiO2 / Ti composites degrades reactive blue 160 under UV irradiation and is visible photoelectrocatalytically compared to TiO2. The results of XRD characterization of TiO2 crystals in the form of anatase at 2θ, namely 35.1 ° (110), and the substitution of Fe dopant on TiO2 in the form of anatase and rutile crystals. FTIR data indicated the presence of Fe-O bonds at wave numbers <700 nm. SEM-EDX results showed a thin layer of FeTiO3 was formed, indicating that the dip-coating method was effective in the coating process. The performance of the FeTiO3-TiO2 / Ti electrode has the highest activity against the oxidation process under visible light than the TiO2/Ti electrode. The results of degradation of reactive blue 160 dye with a concentration of 0.5 ppm by photoelectrocatalytic showed that the TiO2 / Ti and FeTiO3-TiO2/Ti electrodes were active in visible irradiation with degradation rate constants of 48% and 69%. Keywords: Electrodes, ilmenite, TiO2 / Ti, degradation, reactive blue 160, photoelectrocatalysis


2021 ◽  
Vol 127 (9) ◽  
Author(s):  
Ahmed Ziti ◽  
Bouchaib Hartiti ◽  
Amine Belafhaili ◽  
Hicham Labrim ◽  
Salah Fadili ◽  
...  

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