Magnetic and Magneto-Optical Properties of Al Substituted Bi-RIG Particles Dispersed in a Plastic Binder

1998 ◽  
Vol 517 ◽  
Author(s):  
T. Hirano ◽  
K. Yoshida ◽  
Y. Yamazaki ◽  
T. Namikawa ◽  
M. Kishi
Keyword(s):  
Optical Properties ◽  
Figure Of Merit ◽  
Coating Film ◽  
Storage Medium ◽  
Coating Films ◽  
Al Content ◽  
Dispersed Particles ◽  
Magnetic Compensation ◽  
Nano Size ◽  
Annealing Method

AbstractNano-size R2BiAlxFe5-xO12(R: Dy, Gd, Th) particles were prepared with a coprecipitation and annealing method. The coating films of the particles were prepared with a coating technique. The magnetic and magneto-optical properties of the particles and films were investigated. The coercive forceHcof the particles and films was increased and saturation magnetizationMs. dropped with the Al contentx. TheHcof the coating films was about 200 Oe at the compositions of dispersed particles for which theMswas almost zero. These results suggest that the increase was made with magnetic compensation. The BiTb2A10.6Fe4.4O12coating film shows Faraday rotation spectra. The figure of merit of the film is about 0.5 at 520 nm. The coating BiTb2A10.6Fe4.4O12film is one of the candidate materials for a new economical magneto-optical storage medium.

scholarly journals Fluorescent CQD-Doped Styrene Acrylic Emulsion Coating Film with Enhanced Optical Properties

2021 ◽  
Vol 23 (1) ◽  
pp. 60
Author(s):  
Xiaohui Wang ◽  
Li Xu ◽  
Rui Yang ◽  
Runzhou Huang ◽  
Haiyan Mao
Keyword(s):  
Optical Properties ◽  
Carbon Quantum Dots ◽  
Coating Film ◽  
Coating Films ◽  
Acrylic Emulsion ◽  
Practical Applications ◽  
Wood Processing ◽  
Hydrothermal Approach ◽  
High Fluorescence ◽  
Average Size

Styrene acrylic emulsions (SAEs) have emerged as a promising material for water-based coatings. However, they are still limited by their own defects in practical applications, poor weatherability, and degradation of performance at lower or higher temperatures. Here, we introduce a facile approach to producing fluorescent carbon quantum dots (CQDs) from wood processing residues and fabricating fluorescent CQD/SAE coating films via emulsion-casting. The addition of the fluorescent CQDs enhanced the optical performance of the CQD/SAE coating films. The fluorescent CQDs were prepared via a hydrothermal approach and were obtained after heating at 180 °C for 6 h at a reaction concentration of 50 mg/mL. The synthesized CQDs resulted in a high fluorescence, and the CQDs had an average size of 1.63 nm. Various concentrations of the fluorescent CQDs were doped into the SAE coating film, which improved its optical properties. We also characterized and discussed the products and then explored their optical properties. This study presents the potential of fluorescent CQD/SAE coating films for applications in anti-counterfeiting coatings, fluorescent adhesives, and papermaking.

scholarly journals Transparent TiO2/Cu/TiO2 Multilayer for Electrothermal Application

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1024
Author(s):  
Jingjing Peng ◽  
Changshan Hao ◽  
Hongyan Liu ◽  
Yue Yan
Keyword(s):  
Optical Properties ◽  
Heating Rate ◽  
Figure Of Merit ◽  
Annealing Temperature ◽  
Critical Thickness ◽  
Experimental Results ◽  
Tio2 Layer ◽  
Electrical And Optical Properties ◽  
Partial Crystallization

Highly transparent indium-free multilayers of TiO2/Cu/TiO2 were obtained by means of annealing. The effects of Cu thickness and annealing temperature on the electrical and optical properties were investigated. The critical thickness of Cu mid-layer with optimal electrical and optical properties was 10 nm, with the figure of merit reaching as high as 5 × 10−3 Ω−1. Partial crystallization of the TiO2 layer enhanced the electrical and optical properties upon annealing. Electrothermal experiments showed that temperatures of more than 100 °C can be reached at a heating rate of 2 °C/s without any damage to the multilayers. The experimental results indicate that reliable transparent TiO2/Cu/TiO2 multilayers can be used for electrothermal application.

scholarly journals Analysis of Dielectric Waveguide Grating and Fabry–Perot Modes in Elastic Grating in Optical Detection of Ultrasound

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4081
Author(s):  
Suejit Pechprasarn ◽  
Chayanisa Sukkasem ◽  
Phitsini Suvarnaphaet
Keyword(s):  
Optical Properties ◽  
Dielectric Waveguide ◽  
Figure Of Merit ◽  
Pressure Range ◽  
Optical Filter ◽  
Grating Period ◽  
Wave Mode ◽  
Waveguide Grating ◽  
Fabry Perot ◽  
Optical Grating

In our previous work, we have demonstrated that dielectric elastic grating can support Fabry–Perot modes and provide embedded optical interferometry to measure ultrasonic pressure. The Fabry–Perot modes inside the grating provide an enhancement in sensitivity and figure of merit compared to thin film-based Fabry–Perot structures. Here, in this paper, we propose a theoretical framework to explain that the elastic grating also supports dielectric waveguide grating mode, in which optical grating parameters control the excitation of the two modes. The optical properties of the two modes, including coupling conditions and loss mechanisms, are discussed. The proposed grating has the grating period in micron scale, which is shorter than the wavelength of the incident ultrasound leading to an ultrasonic scattering. The gap regions in the grating allow the elastic grating thickness to be compressed by the incident ultrasound and coupled to a surface acoustic wave mode. The thickness compression can be measured using an embedded interferometer through one of the optical guided modes. The dielectric waveguide grating is a narrow bandpass optical filter enabling an ultrasensitive mode to sense changes in optical displacement. This enhancement in mechanical and optical properties gives rise to a broader detectable pressure range and figure of merit in ultrasonic detection; the detectable pressure range and figure of merit can be enhanced by 2.7 times and 23 times, respectively, compared to conventional Fabry–Perot structures.

scholarly journals Preparation of Cellulose-Based Fluorescent Materials as Coating Pigment by Use of DMSO/DBU/CO2 System

2021 ◽  
Author(s):  
Qinghua Cao ◽  
Jinyue Dai ◽  
Xin Bao ◽  
Zhenyu Zhang ◽  
Fei Liu ◽  
...  
Keyword(s):  
Uv Light ◽  
Tensile Modulus ◽  
Coating Film ◽  
Coating Films ◽  
Fluorescence Response ◽  
Mild Conditions ◽  
Fluorescent Materials ◽  
Bright Color ◽  
Molecular Skeleton ◽  
Quenching Phenomenon

Abstract A series of cellulose-based fluorescent materials are prepared under relative mild conditions by use of the DMSO/DBU/CO2 system to utilize as coating pigments. Through the observation under 365nm UV light, the cellulose-based fluorescent materials exhibit good fluorescence response and bright color. Furthermore, due to the limitation of the molecular skeleton of cellulose, the intrinsic aggregation caused quenching phenomenon commonly existed in conventional organic fluorescent pigments can be effectively inhibited, which is very helpful to retain good fluorescence response in epoxy-based coating material and its coating films. Moreover, the addition of cellulose-based fluorescent materials also increases the mechanical properties of the coating film. The increase of tensile strength and tensile modulus respectively reaches ~39% and ~66%. Solvent resistance and thermal property of the coating films generally remain unchanged. The fabrication of cellulose-based fluorescent materials in DMSO/DBU/CO2 system provides a feasible way to develop the functional application of cellulose.

Microstructure and Optical Properties of Co Sputter Deposited Si-Al Nanocomposite Thin Films

2000 ◽  
Vol 648 ◽  
Author(s):  
F. Niu ◽  
P.J. Dobson ◽  
B. Cantor
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Optical Absorption ◽  
Absorption Peak ◽  
Al Content ◽  
Al Nanoparticles ◽  
Transmission Electron ◽  
Effective Medium Theories ◽  
Nanocomposite Thin Films ◽  
Sputter Deposited

AbstractNovel Si-Al nanocomposite thin films were made by radio frequency co-sputtering of Si and Al with Al content from 0 at.% to 69 at.%. Microstructure and optical properties of the films were characterised by conventional and high resolution transmission electron microscopyand spectrometry in the wavelength range from 200 to 3000 nm. The film microstructure consisted of Al nanoparticles (2-9 nm) embedded in an amorphous Si-Al matrix. Optical absorption spectra of the films up to 50 at.% Al exhibited a sharp absorption peak below500 nm and relatively low absorption above 500 nm. In addition, the absorption peak shifted towards longer wavelengths and the general absorption above 500 nm increased remarkably as Al content increased. For the Si-69at.%Al films, however, an absorption plateau appeared between 300 nm to 700 nm and a second weak and broad absorption peak appeared at around 900 nm. The results are analysed and compared with the optical absorption predicted by various effective medium theories.

scholarly journals A Study on the Annealing Ambient Effect on the Anti-Pollution Characteristics of Functional Film for PV Modules

2018 ◽  
Vol 8 (11) ◽  
pp. 2285
Author(s):  
Sejin Jung ◽  
Jung Kim ◽  
Jang Ko ◽  
Wonseok Choi
Keyword(s):  
Contact Angle ◽  
Mechanical Characteristics ◽  
Spray Coating ◽  
Light Transmittance ◽  
Process Conditions ◽  
Coating Film ◽  
Coating Films ◽  
Functional Coating ◽  
Pollution Characteristics ◽  
Pv Modules

In this study, functional coating film was fabricated on glass for photovoltaic (PV) modules to improve the anti-pollution characteristics of PV modules. The functional coating film applied to a glass substrate through the spray coating method was annealed at 300 °C for 10 min in H2, N2, Ar, O2, and vacuum ambient. The contact angle of the coated surface was measured and it was confirmed that the anti-pollution characteristics were improved as the contact angle decreased. The light transmittance was measured and it exhibited the most excellent characteristics in vacuum. The hardness and adhesion were measured as the mechanical characteristics and they were all excellent regardless of the annealing ambient. Based on the analyzed characteristics, the process conditions of functional coating films were optimized to improve the anti-pollution and mechanical characteristics. If the coating process optimized in this study is applied to PV modules based on these results, improvement in the anti-pollution characteristics can be expected.

scholarly journals 2D layered perovskite containing functionalised benzothieno-benzothiophene molecules: formation, degradation, optical properties and photoconductivity

2020 ◽  
Vol 8 (21) ◽  
pp. 7181-7188
Author(s):  
Wouter T. M. Van Gompel ◽  
Roald Herckens ◽  
Paul-Henry Denis ◽  
Martijn Mertens ◽  
María C. Gélvez-Rueda ◽  
...  
Keyword(s):  
Optical Properties ◽  
Layered Perovskite ◽  
Solvent Vapour ◽  
Annealing Method

Using a solvent vapour annealing method, the crystallinity and photoconductivity of a 2D perovskite containing functionalized benzothieno[3,2-b]benzothiophene cations was enhanced.

scholarly journals High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1742
Author(s):  
Israa Abood ◽  
Sayed Elshahat ◽  
Zhengbiao Ouyang
Keyword(s):  
Ionic Liquid ◽  
Optical Properties ◽  
Ionic Liquids ◽  
Photonic Crystal ◽  
Group Velocity ◽  
Figure Of Merit ◽  
Transmission Rate ◽  
Flat Band ◽  
Photonic Crystal Waveguide ◽  
The Future

Slow light with adequate low group velocity and wide bandwidth with a flat band of the zero-dispersion area were investigated. High buffering capabilities were obtained in a silicon-polymer coupled-slot slab photonic crystal waveguide (SP-CS-SPCW) with infiltrating slots by ionic liquid. A figure of merit (FoM) around 0.663 with the lowest physical bit length Lbit of 4.6748 µm for each stored bit in the optical communication waveband was gained by appropriately modifying the square air slot length. Posteriorly, by filling the slots with ionic liquid, the Lbit was enhanced to be 4.2817 μm with the highest FoM of 0.72402 in wider transmission bandwidth and ultra-high bit rate in terabit range, which may become useful for the future 6G mobile communication network. Ionic liquids have had a noticeable effect in altering the optical properties of photonic crystals. A polymer was used for the future incorporation of an electro-optic effect in buffers to realize the dynamic controlling of optical properties. Ionic liquids enhanced the transmission rate through optical materials. Additionally, the delay time in the ns-range was achieved, providing longer delay and ultra-low group velocity, which is important for light-matter interaction in light amplifiers and nonlinear devices.

Tool Wear of Aluminum/Chromium/Tungsten/Silicon-Based-Coated End Mill Cutters in Milling Hardened Steel

2017 ◽  
Vol 263 ◽  
pp. 85-89
Author(s):  
Tadahiro Wada ◽  
Hiroyuki Hanyu
Keyword(s):  
Fracture Toughness ◽  
Layered Structure ◽  
Hardened Steel ◽  
Type I ◽  
Coating Film ◽  
Type Ii ◽  
End Mill ◽  
Coating Films ◽  
Silicon Based ◽  
Coated Cemented Carbide

In turning hardened steel, polycrystalline cubic boron nitride (cBN) compacts are widely used, due to their high hardness and high thermal conductivity. However, in milling hardened steel, fracture of cBN cutting tools readily occurs because they have poor fracture toughness. Therefore, coated cemented carbide tools, which have good fracture toughness and wear resistance, are generally and widely used. In this study, hardened steel (ASTM D2, JIS SKD11, 60HRC) was milled with three physical vapor deposition coated cemented carbide end mill cutters in order to determine effective tool materials for milling hardened steel. The coating films used were two types of aluminum/chromium/tungsten/silicon-based-coating films and (Ti,Al)N-coating film. The two types of aluminum/chromium/tungsten/silicon-based-coating films are a new type of coating film, and the Type I and Type II coating film was a two-layered and multi-layered structure, respectively. The following results were obtained: (1) In milling hardened steel at a cutting speed of 2.5 m/s, Type II coating film was the best coating material among the three types of coated film. Type I coating film was superior to (Ti,Al)N-coating film. (2) The critical scratch load of both Type I and Type II of over 130 N became larger than that of the (Ti,Al)N-coating film of 65 N. (3) The multi-layered structure is expected to improve the tool life.

Properties of Sol-Gel Coating Film from Colloidal Silica-Silane Sol

2007 ◽  
Vol 544-545 ◽  
pp. 813-816
Author(s):  
Moon Kyong Na ◽  
Myeong Sang Ahn ◽  
Hoy Yul Park
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Colloidal Silica ◽  
Sol Gel ◽  
Dip Coating ◽  
Hydroxyl Group ◽  
Coating Film ◽  
Coating Films ◽  
Glass Substrates ◽  
In The Beginning

Two kinds of colloidal silica(CS)/silane sol solutions were prepared. Two sol solutions are involved with the kinds of silane such as methyltrimethoxysilane(MTMS) and -Glycidoxypropyl trimethoxysilane(ETMS) using LS CS. MTMS was added to two sol solutions. Whether ETMS was added or not, two kinds of sol solutions were synthesized. Using two kinds of sol solutions, sol-gel coating films were formed on glass substrates via dip-coating process. Here, seasoning effect of for enhancing properties of sol-gel coating layer on glass was investigated while such sol-gel solutions were left for 7days. Also, their properties such as surface free energy, roughness, thermal property, potential hardness and elastic portion were characterized in order to understand the effect of addition of ETMS. In this case of LS/MTMS sol, the coating film had low surface free energy and more enhanced flat surface than that of the case of LS/MTMS/ETMS sol. ETMS forms hydrophilic hydroxyl group in sol solution, then surface free energy of LS/MTMS/ETMS coating film increased. In the beginning of reaction sol solution seemed to be unstable, but 4days later their coating film properties such as surface free energy and roughness enhanced. The elastic portion of coating films obtained from LS/MTMS/ETMS sol increased with addition of ETMS, but thermal stability decreased.

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