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Ito, Eisuke,Arai, Takayuki,Hara, Masahiko,Noh, Jaegeun Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.6
Surface potential and growth processes of hexadecanethiol (HDT) self-assembled monolayers (SAMs) on Au(111) surfaces were examined by Kelvin probe method and scanning tunneling microscopy. It was found that surface potential strongly depends on surface structure of HDT SAMs. The surface potential shift for the striped phase of HDT SAMs chemisorbed on Au(111) surface was +0.45 eV, which was nearly the same as that of the flat-lying hexadecane layer physisorbed on Au(111) surface. This result indicates that the interfacial dipole layer induced by adsorption of alkyl chains is a main contributor to the surface potential change. In the densely-packed HDT monolayer, further change of the surface potential was observed, suggesting that the dipole moment of the alkanethiol molecules is an origin of the surface potential change. These results indicate that the work function of a metal electrode can be modified by controlling the molecular orientation of an adsorbed molecule.
Masafumi Ito,Takayuki Ohta,Masaru Hori 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.6
Recently, many kinds of non-equilibrium atmospheric-pressure plasma sources have been developed for medical and agricultural applications. Some sources have been applied to agricultural crops and foods for the inactivation of microorganisms and the acceleration of seed germination and crop growth. In this article, the applications of plasmas to disinfection of agricultural crops and foods are reviewed. Then, a high-density non-equilibrium atmospheric pressure plasma (NEAPP) applied for inactivating fungal spores of Penicillium digitatum, a difficult-to-inactivate food spoilage microorganism, is introduced as an environmentally safe and rapid inactivation method. The NEAPP employing Ar gas has a high electron density on the order of 1015 cm−3. The spores were successfully inactivated with a decimal reduction time in spores (D value) of 1.7 min. The contributions of ozone and UV radiation to the inactivation of the spores were evaluated and concluded not to be dominant. Therefore, the significance of neutral reactive species is suggested in the rapid inactivation using NEAPP.
Eisuke Ito,Takayuki Arai,Masahiko Hara,노재근 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.6
Surface potential and growth processes of hexadecanethiol (HDT) self-assembled monolayers (SAMs) on Au(111) surfaces were examined by Kelvin probe method and scanning tunneling microscopy. It was found that surface potential strongly depends on surface structure of HDT SAMs. The surface potential shift for the striped phase of HDT SAMs chemisorbed on Au(111) surface was +0.45 eV, which was nearly the same as that of the flat-lying hexadecane layer physisorbed on Au(111) surface. This result indicates that the interfacial dipole layer induced by adsorption of alkyl chains is a main contributor to the surface potential change. In the densely-packed HDT monolayer, further change of the surface potential was observed, suggesting that the dipole moment of the alkanethiol molecules is an origin of the surface potential change. These results indicate that the work function of a metal electrode can be modified by controlling the molecular orientation of an adsorbed molecule.
Potentiality of Oxygenated Fuels on Soot-Free Diesel Combustion
Takaaki Kitamura,Takayuki Ito,Jiro Senda,Hajime Fujimoto 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
Fuel/air equivalence ratio '??' and temperature 'T' have a significant effect on the quality of particulate formation. In other words, it is probable that smokeless diesel combustion is realized if ?? and T inside the burning plume could be controlled based on the dependence of those on soot formation. The purpose of this work is to extract smokeless ?? - T conditions for various kinds of fuels, including paraffinic hydrocarbon, aromatic hydrocarbon, and oxygenated hydrocarbon, and to discuss a possibility of smokeless diesel combustion avoiding a soot formation region on ?? - T diagram. Sooting ?? - T map, which shows the tendency to generate soot particles as a function of ?? and T, was made using a detailed soot formation model. The model was based on a combination of a detailed reaction mechanism to calculate the gas phase chemistry and a detailed kinetic soot model based on the method of moments. It was found that smokeless ?? - T condition becomes more widespread especially for oxygenated fuels, due to the notable reduc-tion of both acetylene and PAHs. As a result of this work, a new concept for diesel combustion has been developed that utilizes the smokeless nature of oxygenated fuels.