Papers by Keyword: HCl

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Authors: Warut Khamon, Wisanu Pecharapa
Abstract: Transparent ZnO films were deposited by sol-gel spin coating process. HCl acid was used in the wet etching process to modify its surface morphology that can be used as an anti-reflective layer of optoelectric devices. The effect of etching time on its structure, surface morphologies and optical properties were scrutinized. The overall results indicated that HCl acid has obviously effect on significant change in surface morphologies and its roughness varied in the range of 0.5 nm to 4.9 nm.
Authors: Yu Hua Dong, Ya Nan Liu, Qiong Zhou
Abstract: Different kinds of dopants were selected to dope polyaniline by chemical oxidative polymerization in this paper. Major characteristic peaks and microstructure of the doped polyaniline were analyzed by Fourier transform infrared spectra (FTIR) and scanning electron microscope (SEM). Measurement of membrane potential indicated that polyaniline doped with protonic acid such as sulfosalicylic acid (SSA) and hydrochloric acid (HCl) had characteristic of anionic selectivity, and polyaniline doped with cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB) had characteristic of cationic selectivity. Doped polyaniline was added to the epoxy resin to obtain different ions selective coatings, such as anionic coating, cationic coating and bipolar coating. Results of electrochemical test in 5% potassium chloride (KCl) solution (at 60 °C) showed that anti-corrosion performance of the bipolar coating is better than that of cationic coating, and performance of the cationic coating is better than that of anionic coating. And the coatings contained HCl-doped polyaniline had better protection performance than those of SSA-doped because of its micro appearance and distribution.
Authors: Endang Tri Wahyuni, Roto Roto, Indra P. Iqbah
Abstract: In order to decrease CO2 level, converting the gas into hydrocarbon fuel gasses has been performed by using photoreduction method under TiO2/SiO2 photocatalysis. The silica (SiO2) for TiO2/SiO2 preparation was purified from volcanic ash, that mixed with TiO2 suspended in water. The photoreduction process of CO2 was carried out in a batch technique, by exposing CO2 and water vapor in the presence of TiO2/SiO2 photocatalyst with UV lamp for 24 h. The gasses produced from the photoreduction were determined by gas chromatography method. In the research, the effects of HCl and HNO3 as hydrogen ion supplier were also evaluated. The research results indicate that the photoreduction of CO2 with the water vapor over the photocatalyst of TiO2/SiO2-volcanic ash has successfully produced methane and ethylene as fuel gasses, while in the presence of TiO2 no ethylene was resulted. The methane produced by TiO2/SiO2 was observed to be larger than by TiO2 powder. The content of TiO2 in TiO2/SiO2 with low level strongly influenced the yield of the products. In contrast, the yield was independent on the TiO2 content in high level. The presence of the acids was found to increase the methane produced , and no ethylene was formed, but instead, methanol was resulted. The effect of HCl was higher than HNO3.
Authors: Chang Bin Shen
Abstract: At four different temperatures, by potentiodynamic polarization curve, the inhibiting effect of dicyclohexyl thiourea (DCTU) on the corrosion behavior of 304L stainless steel in 2 M hydrochloric acid solution was investigated. The result indicated that DCTU acted as an efficient anodic inhibitor for the corrosion of 304L SS. Excellent inhibition efficiency was evident in the acidic solution and found to vary with temperature and concentration of the inhibitor. The adsorption of this compound on the 304L SS surface was found to obey Temkeins adsorption isotherm and the inhibition was governed by chemisorption mechanism. The deduced thermodynamic parameters of adsorption revealed a strong interaction and spontaneous adsorption of DCTU on the metal surface.
Authors: Shi Yang Ji, Ryoji Kosugi, Kazutoshi Kojima, Kazuhiro Mochizuki, Yasuyuki Kawada, Kohei Adachi, Shingo Saito, Akiyo Nagata, Yasuko Matsukawa, Yoshiyuki Yonezawa, Sadafumi Yoshida, Hajime Okumura
Abstract: By mapping the source and HCl flow rates dependent growth rates, the evolving trend of a quasi-selective epitaxial growth (quasi-SEG) that growing very thin epilayer on mesa top and ensuring an extremely low risk of voids defect generation was firstly figured out on a 5-μm 4H-SiC trench. Then, basing on the acquired knowledge, a 25-μm 4H-SiC trench with an aspect ratio up to ~10 was completely filled in the quasi-SEG mode.
Authors: Hervé Fontaine, Marc Veillerot, Adrien Danel
Authors: Hrishikesh Das, Galyna Melnychuk, Yaroslav Koshka
Abstract: Dislocations were investigated in the halo-carbon low-temperature epitaxial growth and low-temperature selective epitaxial growth (LTSEG) conducted at 13000C. The origin of triangular defects was investigated in low-temperature epilayers grown at higher growth rates with HCl addition. Due to the conversion of substrates’ basal plane dislocations (BPD) into threading dislocations, the concentration of BPDs was about an order of magnitude lower than the concentration of threading dislocations at moderate growth rates. An additional order of magnitude conversion of BPDs into threading dislocations was observed at higher grow rates achieved with HCl addition. In LTSEG epilayers, dislocation concentration away from the mesa walls was comparable to the blanket (i.e., regular non-selective) growth. High concentrations of BPDs were found only at mesa edges located on the “upstream” side with respect to the step-flow direction. No substrate defects could be traced to the triangular defects. Instead, the disturbances causing the triangular defect generation are introduced during the epitaxial process.
Authors: Pawan Kumar, Parveen Kumar, Akash Deep, Lalit M. Bharadwaj
Abstract: Basolite Z-1200 is one of the most popular commercially available MOF for the gas storage applications. Pristine Basolite Z-1200 is an electrically non-conducting material. This research focuses to tap the potential of Basolite Z-1200’s unique porous structure for the adsorption and sensing of a pesticide. For this, the above said MOF has been treated with mineral acids (HCl) to make it electrically active. The protonated MOF solutions have been used to form conducting thin films on glass slides. Electrical measurements have indicated that the proton doping reduces the overall resistance of the MOF. Prepared thin films have been used to sense Mecoprop some in sample solutions. Conducting MOF thin films may find applications in environmental sensors, pre-concentration, solid phase extraction, electronic devices etc.
Authors: Ming Hui Guo, Xin Guan
Abstract: The changes of the surface colors and chemical constituents of Mongolian Scotch pine treated by UV light were investigated by spectrophotometer and FTIR followed by acid pretreatment. The results show that the changes of the surface colors are related to carbonyl, aromatic nucleus, arone, Ar-OH, paraquinones, ortho quinine and so on in the course of UV irradiation. Acid promotes photocycloaddition and plays a hyperchromic effect.
Authors: John Oshinowo, Ann Kristine Neelsen, Matthias Fryda, Lutz Rebstock, Ulrich Quarti
Abstract: This work demonstrates the efficient removal of various metals from the plastic surface of wafer storage cassettes (FOUP’s) by using electrolyzed water. The studies are ruled out for Anodic water chloride. This new wet cleaning technology is a powerful application, not for FOUP’s only, but also for innovative semiconductor surface preparation and FEOL cleaning applications.
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