Papers by Keyword: Transparent

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Authors: Yamini Asthana, Dong Pyo Kim
Abstract: Formation of coatings with combined properties of being superhydrophilic / superhydrophobic is of immense applications in the field of optics. In our present work, we developed a hydrophilic, antifogging, transparent, and stable coating by employing an anionic electrolyte, Tiron and dip-coating of organic-inorganic mixture. One of the attempts was to adhere Tiron on metal oxide surface by chelating effect, and the other one was to apply an organicinorganic coating on glass or lens substrate. The latter was formulated by mixing appropriate ratios of organic silanol coupling agents and diacrylates component for strong adhesion to the substrate, and inorganic component of a hybrid mixture of silica, titania and Tiron for the antifogging behavior. The surface chemistry of the coated films was studied by taking ATR-IR measurements, and the wetting behavior was characterised by contact angle measurement
Authors: Long Long Chen, Xi Feng Li, Ji Feng Shi, Chang Zhou, Jian Hua Zhang
Abstract: ITO transparent film was deposited on glass substrates by RF-magnetron sputtering equipment as electrode, routing material and the photolithography process was studied. The results shown that the ITO based transparent electrode routing needs larger dose energy than that Mo based substrate when the PR processes were all identical. The photo resist cannot be exposed thoroughly where the length/width ratio of gap between routing serried lines lager than 80 as the typical Mo based exposure process. The width of gap reached to 8.7um which was the limit of exposure machine of transparent film after the 2000um-length, 4um-width gap was exposed thoroughly. It should be attention of the routing gap design for electrical characters in transparent flat panel display.
Authors: Ai Hong Guo, Xue Jiao Tang, Su Juan Zhang
Abstract: Water-based infrared ray shielding coating, that is, nanometer metal oxide is added to the water-based paint, which has anti-IR features without affecting the transparency of the paint. In this paper, the nanometer oxides are prepared by sol-gel method, added into polypropylene sour. In order to improve the infrared ray shielding of the thin film, two kinds of nanometer oxides are added into the polypropylene sour with different volume ratios, the shielding performance of the paint is studied. Experimental results show: in the 8000 ~ 4000cm-1 range, the transmittances of infrared ray is 30% to 75%; in 4000 ~ 400cm-1 range, transmittances decrease significantly; 3% ZnO, 3% Fe2O3, 3% Y2O3, 2% Al2O3 are the best mass ratio of every single nanometer oxide; the infrared shielding rate of Fe2O3 and Y2O3 mixture with the volume ratio of 1 to 4 is better than Fe2O3 and Y2O3 single.
Authors: Immanuel Schäfer
Abstract: Fenestraria aurantiaca (also known as window plant) is a succulent with specialized adaptations to deal with heat, light and aridity. Fenestraria aurantiaca (F. a.) grows with most of its body under the sand. Just the top, with a light transparent surface – the window – on it, protrudes from the surface hence giving explanation to the plants name. Experiments with light, and detailed microscopy studies show the physical, biological and chemical capabilities of F. a. It was found that the window works as a lens, light from a 90 ° angle is directed into the plant. Thereby the window filters the light. Up to 90 % of the visible light is blocked; with rising wavelength the window gets more transparent until the near infrared light (1000 nm) where the transparency declines rapidly. But the parenchyma is up 90 % transparent. Based on those results the principles of the plant were defined, which are used for abstractions. Generally F.a. has four principles: light handling, surface cleaning, heat avoidance and water storing. Improvements founded on the inspiration of the window plant seem to be possible in photovoltaic systems, which have problems with overheating and also light concentration. An example solution called “buried solar cells” is presented. Another working field is the screen of mobile devices, where the clarity and readability suffers from direct sunlight. With the help from the methods displayed by F.a., there is an energy saving solution explained.
Authors: Shu Ming Wang, Feng Hua Kuang, Qing Zhi Yan, Qing Chun Zhang, Chang Chun Ge
Abstract: In this article we present a new kind of large grain transparent glass-ceramics obtained by the method of crystal growth from a homogenous glass, the simultaneous variation of the glass matrix and crystalline compositions during the crystallization results in the high transparency of this kind of large grain, high crystalline volume glass-ceramics, which have suitable refractive indexes between respective phases. The nucleation and crystallization behaviors of this kind of glass-ceramics have been investigated. The optimum heat treatment schedule for the glass was determined by means of DSC, XRD and SEM. The desirable optical property, such as laser characteristics etc, of this new kind of glass-ceramics can be further developed by doping with transition metals or rare-earths.
Authors: Ling Yang, Yu Pei Zhang, Ji Wen Xu, Hua Wang
Abstract: Boron doped ZnO (BZO) thin films were deposited on glass substrate by ultrasonic spray pyrolysis method using zinc acetylacetonate and boric acid. The structural, morphological, optical and electrical properties of BZO thin films under various doping level of boron and substrate temperature were investigated. The results show that zinc acetylacetonate is helpful to deposit BZO thin films at low temperature. The morphology of grains at low and high substrate temperature is circular and flake-like. The preferred orientation along (101) plane is obvious at 360 °C. The doping level and substrate temperature have remarkable influence on sheet resistance, but little impact on visible transmittance. The optimal sheet resistance of 173 Ω/sq and average visible transmittance of above 80% can be achieved at doping level of 5 at% and growth temperature of 340 °C.
Authors: Geun Sik Bae, Che Young Kim
Abstract: A broadband multi-layer radar absorbing coating (RAC) and transparent shielding film (TSF) operating within the frequency range of 7 to 12 GHz are designed and fabricated for the purpose of a radar cross section (RCS) reduction of complex naval targets such as submarines and ships. The proposed RAC consists of three layers, a shop primer, a main absorbing material, and epoxy resin paint. In addition, a TSF was fabricated by coating an ITO/Ag/ITO multilayer on a polyethylene terephthalate (PET) substrate using roll-to-roll DC plasma deposition technique. The experimental results demonstrate that the proposed RAC guarantees an RCS reduction of 10 to 15 dB from 7 to 12 GHz.
Authors: Naoko Yamaguchi, Kiyoharu Tadanaga, Masahiro Tatsumisago
Abstract: Zn-Al layered double hydroxide (LDH) thin films intercalated with various organic anions were prepared by immersion of sol-gel derived amorphous Al2O3-ZnO thin films in hot water containing organic salts like sodium dodecyl sulfate (SDS), sodium p-toluenesulfonate, and benzenecarboxylates. In all the systems, extended interlayer spacing of the Zn-Al LDH was observed after immersion in distilled water with the organic salts in comparison to the LDH with carbonate anions, indicating that we have succeeded in direct formation of Zn-Al LDH films with various organic anions on the substrates. It is suggested that divalent anions such as terephthalate ion have higher selectivity than monovalent anions.
Authors: Chen Chen, Jia Jia Cao, Yu Wang, Yi Ding Wang
Abstract: We added different amount of Fe (NO3)3 to the solution made of aluminum nitrate, copper nitrate and isopropanol to form gel. CuAl1-xFexO2 (x = 0, 0.01, 0.03, 0.05, 0.07, 0.09) powders and films were prepared in our experiments. The films were prepared on the quartz substrates. The powders and films were annealing at 1050 °C for 5 hours in the air. The powders were detected by X-ray diffraction to represent the structure of CuAl1-xFexO2. The square resistance of the films was determined by RTS-8 four-probe. The lowest square resistance is of CuAl0.95Fe0.05O2 film 3.3 KΩ/□ .Ultraviolet spectrophotometer (UV-3600, 230VCE) was used to measure the transmittance of the films. Fe-doping has a positive impact on the conductivity but negative impact on the transmittance.
Authors: Yasuhiro Shigetoshi, Susumu Tsukimoto, Hidehisa Takeda, Kazuhiro Ito, Masanori Murakami
Abstract: The electrical and optical properties, and microstructures of 100 nm-thick Ga2O3 films fabricated on Al2O3(0001) substrates by a sputtering deposition were investigated. The partial pressure of oxygen was controlled and the substrate temperature was kept to be 500 °C during deposition. With increasing the oxygen partial pressure, the structures of the Ga2O3 films deposited on the substrates were observed to change from amorphous to crystalline (monoclinic β-type Ga2O3). The transmittance of the Ga2O3 films was measured to be more than 80 % at the visible and ultraviolet regions although the electrical resistivity was high. In order to obtain both low electrical resistivity and high transmittance at the ultraviolet regions, the addition of active dopant elements such as Sn into the Ga2O3 films would be required.
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