The Experts below are selected from a list of 109647 Experts worldwide ranked by ideXlab platform
Tatsuya Okubo - One of the best experts on this subject based on the ideXlab platform.
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Spontaneous formation of large-area monolayers of well-ordered nanoparticles via a wet-Coating Process
Journal of Nanoparticle Research, 2004Co-Authors: Minghui Hu, Shigeki Chujo, Hiroyuki Nishikawa, Yukio Yamaguchi, Tatsuya OkuboAbstract:Monolayers of well-ordered close-packed silica nanoparticles (NPs) with a diameter of 25 nm were spontaneously formed on silicon substrates over a large area and at a high rate via a wet-Coating Process using a capillary coater. The effects of zeta potential, dispersion solvent, and substrate friction on the NP self-assembly induced by the solvent evaporation were investigated. Experimental results showed that the solvent and the substrate had a larger impact on the order of formed monolayers than the zeta potential did, which are discussed from the viewpoint of the Derjaguin-Landau-Verwey-Overbeek (DLVO) and non-DLVO theories. Based on the above studies, we proposed a solution to fabrication of well-ordered NP monolayers without boundary defects at the surface coverage of ∼1 via the wet-Coating Process.
Keehyun Shin - One of the best experts on this subject based on the ideXlab platform.
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optimized design for anti reflection Coating Process in roll to roll slot die Coating system
Robotics and Computer-integrated Manufacturing, 2014Co-Authors: Janghoon Park, Keehyun ShinAbstract:Abstract This study investigated the application of the anti-reflection (AR) Coating technology by using the roll-to-roll (R2R) slot-die Coating Process. To simulate the Coating phenomenon, we investigated governing parameters in the slot-die Coating Process by using a viscocapillary model. Results of using this model revealed that the Coating speed and solid content are two dominant factors affecting transmittance, which is an important parameter for the AR Coating Process. As the design of experiment methodology, response surface design was used to observe parameter interactions and establish a meta model for obtaining optimum Process conditions. Further, to enhance the accuracy of analysis of the Coating performance, the light wavelength was divided into visible and IR wavelength regions. In addition, the average and standard deviation values of transmittance were determined by a statistical correlation. An improvement of approximately 5% of the transmittance was observed in comparison to that of an uncoated (bare) substrate. The optimum conditions of Process parameters for the AR Coating Process were determined through the established meta model and guidelines for performing the AR slot-die Coating Process were suggested.
Minghui Hu - One of the best experts on this subject based on the ideXlab platform.
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Spontaneous formation of large-area monolayers of well-ordered nanoparticles via a wet-Coating Process
Journal of Nanoparticle Research, 2004Co-Authors: Minghui Hu, Shigeki Chujo, Hiroyuki Nishikawa, Yukio Yamaguchi, Tatsuya OkuboAbstract:Monolayers of well-ordered close-packed silica nanoparticles (NPs) with a diameter of 25 nm were spontaneously formed on silicon substrates over a large area and at a high rate via a wet-Coating Process using a capillary coater. The effects of zeta potential, dispersion solvent, and substrate friction on the NP self-assembly induced by the solvent evaporation were investigated. Experimental results showed that the solvent and the substrate had a larger impact on the order of formed monolayers than the zeta potential did, which are discussed from the viewpoint of the Derjaguin-Landau-Verwey-Overbeek (DLVO) and non-DLVO theories. Based on the above studies, we proposed a solution to fabrication of well-ordered NP monolayers without boundary defects at the surface coverage of ∼1 via the wet-Coating Process.
Mingxi Qiao - One of the best experts on this subject based on the ideXlab platform.
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a novel electrostatic dry Coating Process for enteric Coating of tablets with eudragit l100 55
European Journal of Pharmaceutics and Biopharmaceutics, 2013Co-Authors: Mingxi Qiao, Liqiang Zhang, Wei XiaoAbstract:Abstract An electrostatic dry Coating Process based on a liquid pan coater was developed for enteric Coating of tablets with Eudragit® L100-55. Two different liquid plasticizers of triethyl citrate (TEC) and PEG400 were used in the Coating Process. In contrast to TEC, PEG400 produced good powder adhesion and successful Coating. DSC results showed that PEG400 lowered the glass transition temperature ( T g ) of Eudragit® L100-55 to a greater extent than TEC at the same blend ratio, indicating that PEG400 was more effective in plasticizing the polymer. PEG400 showed higher contact angle on both surfaces of tablet cores and Coating powders as well as lower absorption into the tablet cores than TEC, suggesting that more PEG400 existed at the interface between tablet core and Coating powders. The combination effects of higher plasticizing efficiency and more PEG400 available at the tablet surface produced higher plasticization of Eudragit® L100-55, leading to the successfully initial powder adhesion. The powder adhesion was further enhanced by the electrostatically assisted Coating Process, as confirmed by the higher Coating level and Coating efficiency with electrical charging (60 kV) than the ones without it (0 kV). The micrographs of scanning electron microscopy and in vitro drug release tests of the coated tablets showed that higher curing temperature and longer curing time led to enhanced film formation and acid resistance. The electrostatic dry Coating Process has been demonstrated to be a promising Process for enteric Coating of tablets.
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A novel electrostatic dry powder Coating Process for pharmaceutical dosage forms: Immediate release Coatings for tablets
European Journal of Pharmaceutics and Biopharmaceutics, 2010Co-Authors: Mingxi Qiao, Jesse Zhu, Yingliang Ma, Liqiang Zhang, Kwok ChowAbstract:An electrostatic dry powder Coating Process for pharmaceutical solid dosage forms was developed for the first time by electrostatic dry powder Coating in a pan coater system. Two immediate release Coating compositions with Opadry® AMB and Eudragit® EPO were successfully applied using this Process. A liquid plasticizer was sprayed onto the surface of the tablet cores to increase the conductivity of tablet cores to enhance particle deposition, electrical resistivity reduced from greater than 1×1013Ωm to less than 1×109Ωm, and to lower the glass transition temperature (Tg) of the Coating polymer for film forming in the pan coater. The application of liquid plasticizer was followed by spraying charged Coating particles using an electrostatic charging gun to enhance the uniform deposition on tablet surface. The Coating particles were coalesced into a thin film by curing at an acceptable Processing temperature as formation was confirmed by SEM micrographs. The results also show that the optimized dry powder Coating Process produces tablets with smooth surface, good Coating uniformity and release profile that are comparable to that of the tablet cores. The data also suggest that this novel electrostatic dry powder Coating technique is an alternative to aqueous- or solvent-based Coating Process for pharmaceutical products. © 2010.
B. L. Zhou - One of the best experts on this subject based on the ideXlab platform.
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SiC Coating on carbon fibres by a solution Coating Process
Composites Manufacturing, 2008Co-Authors: Yu-qing Wang, Z. G. Wang, Jun-ying Yang, Feng-qiu Zhang, B. L. ZhouAbstract:One way of overcoming the shortcomings of carbon fibres is to coat them with SiC. In this work, carbon fibres were coated with a polycarbosilane solution and then pyrolysed continuously at high temperature to obtain the SiC Coating. Effects of the Coating Process on the structure of the Coating and the properties of the coated fibres were studied in detail. The results show that the solution Coating Process is a simple and applicable technique. The uniform and continuous Coating improved the oxidation resistance and strength of the carbon fibres, as well as their wettability with aluminium. The Coating also controlled the harmful reaction at the interface of aluminium matrix composites and improved composite strength.
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SiC Coating on carbon fibres by a solution Coating Process
Composites Manufacturing, 1995Co-Authors: Yu-qing Wang, Z. G. Wang, Jun-ying Yang, Feng-qiu Zhang, B. L. ZhouAbstract:One way of overcoming the shortcomings of carbon fibres is to coat them with SiC. In this work, carbon fibres were coated with a polycarbosilane solution and then pyrolysed continuously at high temperature to obtain the SiC Coating. Effects of the Coating Process on the structure of the Coating and the properties of the coated fibres were studied in detail. The results show that the solution Coating Process is a simple and applicable technique. The uniform and continuous Coating improved the oxidation resistance and strength of the carbon fibres, as well as their wettability with aluminium. The Coating also controlled the harmful reaction at the interface of aluminium matrix composites and improved composite strength.