The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Lionel C. Kimerling - One of the best experts on this subject based on the ideXlab platform.
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Silicon waveguide sidewall smoothing by wet Chemical Oxidation
Journal of Lightwave Technology, 2005Co-Authors: Daniel K. Sparacin, Steven J. Spector, Lionel C. KimerlingAbstract:This paper reports a new and more efficient Si waveguide sidewall smoothing process using wet Chemical Oxidation. Sidewall roughness is a major source of loss and an impediment to realizing high-transmission Si waveguides. The postetch multistepped approach allows for efficient smoothing (in terms of roughness amplitude reduction to material consumption) by continuous Oxidation in the fast reaction-limited regime. This method reduces waveguide transmission loss without sacrificing dimensional integrity or thermal budget. In this proof-of-concept work, Si waveguide sidewall loss has been reduced from 9.2 to 1.9 dB/cm.
R Dashti - One of the best experts on this subject based on the ideXlab platform.
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synthesis of calcium peroxide nanoparticles as an innovative reagent for in situ Chemical Oxidation
Journal of Hazardous Materials, 2011Co-Authors: Javad Khodaveisi, Hossein Banejad, Ehsan Olyaie, Sina Lashgari, Abbas Afkhami, R DashtiAbstract:Abstract Chemical Oxidation is one of the many different methods of site remediation that has emerged lately as an alternative method to traditional techniques. According to this research calcium peroxide is suitable choice for contaminant biodegradation in soil and ground water but speed of Oxidation reaction between calcium peroxide and contaminant is slow. Synthesis of calcium peroxide in nano size by increased ratio of surface to volume can increase the speed of reaction and solve the problem. We have developed a simple surface modification technique to avoid irreversible agglomeration of calcium peroxide nanoparticles. The technique is based on hydrolysis–precipitation procedure, using CaCl2 as a precursor. Polyethylene glycol 200 (PEG200) is used as a surface modifier. CaO2 was identified and studied by characterization techniques, including XRD and TEM. The results indicate the ability of this method for synthesis of new reagent in nano size and improve quality of in situ Chemical Oxidation. Size determination by TEM image indicates the size of calcium peroxide nanoparticles approximately 15–25 nm.
Shahabaldin Rezania - One of the best experts on this subject based on the ideXlab platform.
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An overview on production and application of ferrate (VI) for Chemical Oxidation, coagulation and disinfection of water and wastewater
Journal of Environmental Chemical Engineering, 2017Co-Authors: Amirreza Talaiekhozani, Mohammad Reza Talaei, Shahabaldin RezaniaAbstract:Coagulation, Chemical Oxidation and disinfection are essential processes in water and waste treatment. A Chemical that can be applied for all the above-mentioned purposes is ferrate (VI). The aim of this study is to review ferrate (VI) production, measurement, stability, mutagenicity and utilization in coagulation, Chemical Oxidation and disinfection of water and wastewater treatment. Also, in this study different electroChemical reactors that can be used for ferrate (VI) production have been introduced. In acidic conditions, the Oxidation and reduction capacity of ferrate (VI) is superior to all currently utilized oxidizers and disinfectants in water and wastewater treatment. New research provides the technologies of using ferrate (VI) for coagulation, Chemical Oxidation and disinfection of water and wastewater simultaneously in a reactor, which can reduce the size of water and wastewater treatment plants and increase their treatment efficiency. Despite the existence of these technologies, there is no full-scale application of ferrate (VI) in the water and wastewater industry. This is due to difficulties associated with (1) the lack of adequate research demonstrating its capabilities and advantages over existing water and wastewater treatment methods, (2) the instability of ferrate (VI) depending on its method of preparation and (3) the relatively low yield of ferrate (VI). Therefore, to solve the above-mentioned difficulties, fundamental study most be carried out to discover the novel methods of ferrate (VI) production, focusing on increasing product stability and production yield.
Daniel K. Sparacin - One of the best experts on this subject based on the ideXlab platform.
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Silicon waveguide sidewall smoothing by wet Chemical Oxidation
Journal of Lightwave Technology, 2005Co-Authors: Daniel K. Sparacin, Steven J. Spector, Lionel C. KimerlingAbstract:This paper reports a new and more efficient Si waveguide sidewall smoothing process using wet Chemical Oxidation. Sidewall roughness is a major source of loss and an impediment to realizing high-transmission Si waveguides. The postetch multistepped approach allows for efficient smoothing (in terms of roughness amplitude reduction to material consumption) by continuous Oxidation in the fast reaction-limited regime. This method reduces waveguide transmission loss without sacrificing dimensional integrity or thermal budget. In this proof-of-concept work, Si waveguide sidewall loss has been reduced from 9.2 to 1.9 dB/cm.
Robert E. Blankenship - One of the best experts on this subject based on the ideXlab platform.
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Chemical Oxidation of the FMO antenna protein from Chlorobaculum tepidum
Photosynthesis Research, 2013Co-Authors: David Bina, Robert E. BlankenshipAbstract:Effect of Chemical Oxidation by ferricyanide on bacteriochlorophyll a (BChl a ) in the Fenna–Matthews–Olson protein (FMO) was studied using absorbance and fluorescence spectroscopy at ambient and cryogenic temperatures. Partially selective Oxidation of pigments bound to the antenna complex was achieved and the probable absorption wavelength corresponding to the recently discovered bacteriochlorophyll No. 8 of 806 nm was obtained by comparative analysis of the effect of Chemical Oxidation and the effect of different isolation procedures. Formation of a stable product identified as a chlorophyll a derivative occurred upon Chemical Oxidation. This new pigment remained bound within the pigment–protein complex, and exhibited an efficient energy transfer to BChl a . Furthermore, complex effects of the pigment Oxidation upon the fluorescence yield of the FMO protein were observed. Utility of this approach based on Chemical modifications for the investigation of the native regulatory mechanisms involved in the energy transfer in the FMO protein is discussed.