The Experts below are selected from a list of 20079 Experts worldwide ranked by ideXlab platform
Hong Chen - One of the best experts on this subject based on the ideXlab platform.
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facile formation of superhydrophobic silica based surface on Aluminum Substrate with tetraethylorthosilicate and vinyltriethoxysilane as co precursor and its corrosion resistant performance in corrosive nacl aqueous solution
Surface & Coatings Technology, 2014Co-Authors: Jin Liang, Hong ChenAbstract:Abstract A facile sol–gel method has been developed to create a superhydrophobic surface on Aluminum Substrate with tetraethylorthosilicate (TEOS) and vinyltriethoxysilane (VTES) as co-precursor at room temperature. Firstly, nanometer sized silica particles were self assembled on the Substrate through the hydrolysis of TEOS. Then, the silica particles were modified with vinylsiloxane through the hydrolysis and condensation polymerization of VTES. The emphasis was focused on investigating the influence of the molar ratio between NH3·H2O and ethanol on the surface morphology and wetting property. The surface morphology was observed by scanning electron microscopy (SEM), the chemical composition and bonding state of the surface were explored by energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectra (XPS), and the wetting property of the surface was investigated by water contact angle measurement (WCA). The modified silica-based surface possessed the greatest static contact angle of 154.9°, exhibiting excellent superhydrophobic property. A hierarchical microstructure with spherical microparticles of around 2 μm decorated with nanoparticles of around 450 nm was observed on the film surface. The surface was covered by hydrophobic vinyl groups via the decoration of silica microparticles with vinyl-terminated siloxane nanoparticles as evidenced by EDS, FTIR and XPS. The corrosion resistant performance and durability of the superhydrophobic silica-based surface formed on Aluminum Substrate in corrosive NaCl solution were estimated by electrochemical impedance spectroscopy (EIS) measurements. The appropriate equivalent circuit model was put forward to fit and analyze the EIS data. The electrochemical result revealed that the corrosion resistant performance of Aluminum was improved greatly by the superhydrophobic treatment.
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fabrication and corrosion resistance of superhydrophobic hydroxide zinc carbonate film on Aluminum Substrates
Journal of Nanomaterials, 2013Co-Authors: Jin Liang, Yunchu Hu, Yiqiang Wu, Hong ChenAbstract:Superhydrophobic hydroxide zinc carbonate (HZC) films were fabricated on Aluminum Substrate through a convenient in situ deposition process. Firstly, HZC films with different morphologies were deposited on Aluminum Substrates through immersing the Aluminum Substrates perpendicularly into aqueous solution containing zinc nitrate hexahydrate and urea. Secondly, the films were then modified with fluoroalkylsilane (FAS: CH3(CF2)6(CH2)3Si(OCH3)3) molecules by immersing in absolute ethanol solution containing FAS. Themorphologies, hydrophobicity, chemical compositions, and bonding states of the films were analyzed by scanning electron microscopy (SEM), water contact angle measurement (CA), Fourier transform infrared spectrometer (FTIR), and X-ray photoelectron spectroscopy (XPS), respectively. It was shown by surface morphological observation that HZC films displayed different microstructures such as microporous structure, rose petal-like structure, block-shaped structure, and pinecone-like structure by altering the deposition condition. A highest water contact angle of 156.2° was obtained after FAS modification. Moreover, the corrosion resistance of the superhydrophobic surface on Aluminum Substrate was investigated using electrochemical impedance spectroscopy (EIS) measurements. The EIS measurements' results revealed that the superhydrophobic surface considerably improved the corrosion resistance of Aluminum.
Jin Liang - One of the best experts on this subject based on the ideXlab platform.
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facile formation of superhydrophobic silica based surface on Aluminum Substrate with tetraethylorthosilicate and vinyltriethoxysilane as co precursor and its corrosion resistant performance in corrosive nacl aqueous solution
Surface & Coatings Technology, 2014Co-Authors: Jin Liang, Hong ChenAbstract:Abstract A facile sol–gel method has been developed to create a superhydrophobic surface on Aluminum Substrate with tetraethylorthosilicate (TEOS) and vinyltriethoxysilane (VTES) as co-precursor at room temperature. Firstly, nanometer sized silica particles were self assembled on the Substrate through the hydrolysis of TEOS. Then, the silica particles were modified with vinylsiloxane through the hydrolysis and condensation polymerization of VTES. The emphasis was focused on investigating the influence of the molar ratio between NH3·H2O and ethanol on the surface morphology and wetting property. The surface morphology was observed by scanning electron microscopy (SEM), the chemical composition and bonding state of the surface were explored by energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectra (XPS), and the wetting property of the surface was investigated by water contact angle measurement (WCA). The modified silica-based surface possessed the greatest static contact angle of 154.9°, exhibiting excellent superhydrophobic property. A hierarchical microstructure with spherical microparticles of around 2 μm decorated with nanoparticles of around 450 nm was observed on the film surface. The surface was covered by hydrophobic vinyl groups via the decoration of silica microparticles with vinyl-terminated siloxane nanoparticles as evidenced by EDS, FTIR and XPS. The corrosion resistant performance and durability of the superhydrophobic silica-based surface formed on Aluminum Substrate in corrosive NaCl solution were estimated by electrochemical impedance spectroscopy (EIS) measurements. The appropriate equivalent circuit model was put forward to fit and analyze the EIS data. The electrochemical result revealed that the corrosion resistant performance of Aluminum was improved greatly by the superhydrophobic treatment.
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fabrication and corrosion resistance of superhydrophobic hydroxide zinc carbonate film on Aluminum Substrates
Journal of Nanomaterials, 2013Co-Authors: Jin Liang, Yunchu Hu, Yiqiang Wu, Hong ChenAbstract:Superhydrophobic hydroxide zinc carbonate (HZC) films were fabricated on Aluminum Substrate through a convenient in situ deposition process. Firstly, HZC films with different morphologies were deposited on Aluminum Substrates through immersing the Aluminum Substrates perpendicularly into aqueous solution containing zinc nitrate hexahydrate and urea. Secondly, the films were then modified with fluoroalkylsilane (FAS: CH3(CF2)6(CH2)3Si(OCH3)3) molecules by immersing in absolute ethanol solution containing FAS. Themorphologies, hydrophobicity, chemical compositions, and bonding states of the films were analyzed by scanning electron microscopy (SEM), water contact angle measurement (CA), Fourier transform infrared spectrometer (FTIR), and X-ray photoelectron spectroscopy (XPS), respectively. It was shown by surface morphological observation that HZC films displayed different microstructures such as microporous structure, rose petal-like structure, block-shaped structure, and pinecone-like structure by altering the deposition condition. A highest water contact angle of 156.2° was obtained after FAS modification. Moreover, the corrosion resistance of the superhydrophobic surface on Aluminum Substrate was investigated using electrochemical impedance spectroscopy (EIS) measurements. The EIS measurements' results revealed that the superhydrophobic surface considerably improved the corrosion resistance of Aluminum.
Wei Liu - One of the best experts on this subject based on the ideXlab platform.
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controlled growth of superhydrophobic films by sol gel method on Aluminum Substrate
Applied Surface Science, 2010Co-Authors: Yiling Chen, Wei LiuAbstract:Abstract Superhydrophobic surface was prepared by sol–gel method on Aluminum Substrate via immersing the clean pure Aluminum Substrate into the solution of zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and hexamethylenetetraamine (C6H12N4) at different molar ratios and unchanged 0.04 mol/L total concentration, then heated at 95 °C in water bath for 1.5 h, subsequently modified with 18 alkanethiols or stearic acid. When the molar ratios of Zn(NO3)2·6H2O and C6H12N4 were changed from 10:1 to 1:1 the contact angle was higher than 150°. The best prepared surface had a high water contact angle of about 154.8°, as well as low angle hysteresis of about 3°. The surface of prepared films using Zn(NO3)2·6H2O and C6H12N4 composed of ZnO and Zn–Al LDH, and Al. SEM images of the film showed that the resulting surface exhibits different flower-shaped wurtzite zinc oxide microstructure and porous Zn–Al LDH. The special flowerlike and porous architecture, along with the low surface energy leads to the surface superhydrophobicity.
Zhao Zhang - One of the best experts on this subject based on the ideXlab platform.
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preparation of titania nanotube arrays by hydrothermal reaction in combination with anodic Aluminum oxide template attached to Aluminum Substrate
Chinese Journal of Catalysis, 2008Co-Authors: L I Gang, Zhao ZhangAbstract:Abstract TiO2 nanotube arrays were prepared in situ on Aluminum Substrate via hydrothermal reaction, using ammonium hexafluorotitanate as treatment solution and anodic Aluminum oxide attached to Aluminum Substrate as template. Field emission scanning electron microscopy and X-ray diffraction were carried out to characterize the as-synthesized product. The experimental results show that TiO2 nanotube arrays obtained through hydrothermal synthesis exhibit an especial morphology. The surface of the TiO2 nanotube arrays has continuous porous structure, while the cross-section has discrete and unattached tubular structure constituted of densely packed TiO2 nanoparticles with an average particle size of 45 and 25 nm, respectively. Without any further heat treatment, anatase phase crystalline structure of the as-prepared nanotube arrays using this method has already occurred.
Young-se Kwon - One of the best experts on this subject based on the ideXlab platform.
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An X-band high power amplifier module package using selectively anodized Aluminum Substrate
2007 European Microwave Integrated Circuit Conference, 2007Co-Authors: Sung-ku Yeo, Jong-hoon Chun, Kyoung-min Kim, Jong-min Yook, Young-se KwonAbstract:In this paper, we made a high power amplifier module package using a selectively anodized Aluminum Substrate for the X-band radar T/R modules. The proposed solution of package is based on thick anodized Aluminum oxide (Al2O3) layers and power chips mounted on Aluminum for an effective heat sink. The fabricated high power amplifier module has a maximum output power of 39.49 dBm and maximum gain of 32 dB over 9 - 10 GHz frequency band. This package method can be further contributed to decreasing cost, reducing module size and managing thermal problem for the microwave high power T/R modules.
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Embedded IC technology for compact packaging inside Aluminum Substrate (Pocket Embedded Packaging)
2007 European Microwave Integrated Circuit Conference, 2007Co-Authors: Kyoung-min Kim, Sung-ku Yeo, Jong-min Yook, Young-se KwonAbstract:Various technologies have been developed to package microwave systems to achieve low-cost, high-integration, better RF performance and good thermal dissipation. In this paper, we propose a new type packaging technology, "pocket embedded Packaging (PEP)", using selectively anodized Aluminum Substrate. In this technology, chips can be embedded inside Aluminum Substrate so that ultra thin and compact type of package can be achieved. More than 120 mum thick Aluminum oxide (Al2O3) is selectively anodized on an Aluminum Substrate with 5% oxalic acid electrolyte. This thick Aluminum oxide (AI2O3) can be chemically etched with vertical side walls. Rectangular-shape of opening area, which we named "pocket" is easily formed inside Aluminum Substrate. After the formation of the pocket, active chips can be embedded inside it with a tolerance of less than 3 mum. Passive components on an Aluminum oxide (Al2O3) are interconnected with active chips through metallic interconnections.
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Fabrication of the tile type transceiver module package for X-band phase array radar using selectively anodized Aluminum Substrate
2007 1st Asian and Pacific Conference on Synthetic Aperture Radar, 2007Co-Authors: Jong-hoon Chun, Sung-ku Yeo, Young-se KwonAbstract:In this paper, we proposed a tile type transceiver module package for X-band phase array radar system using a selectively anodized Aluminum Substrate. The proposed solution of package is based on thick anodized Aluminum oxide (Al2O3) layers and bare chips mounted on Aluminum for an effective heat sink. This package method can be further contributed to decreasing cost, reducing module size and managing thermal problem for the microwave high power T/R modules.
