Добірка наукової літератури з теми "Chemisorptions"

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Статті в журналах з теми "Chemisorptions"

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Song, Yun Peng, Yan He, and Yuan Zheng Tang. "Molecular Dynamic Study on Thermal Conductivity of Methyl-Chemisorption Carbon Nanotubes." Advanced Materials Research 1096 (April 2015): 520–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1096.520.

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The thermal conductivity at 300K of (6, 6) carbon nanotubes and chemi-adsorbed carbon nanotubes with methyl groups at random positions through covalent bonding (chemisorption) has been calculated as a function of adsorption density using molecular dynamics. The results exhibit a rapid drop in thermal conductivity with chemisorptions, even chemisorption as little as 1.0% of the nanotube carbon atoms reduces the thermal conductivity significantly. Investigate its reason, defects caused by chemisorption blocking the transmission of phonons which plays a leading role in the heat conduction of nano
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Zhang, Ying Tang, and Jun Fang Wu. "The Characteristics of Chemisorptions on Si (001) Surface." Applied Mechanics and Materials 723 (January 2015): 972–75. http://dx.doi.org/10.4028/www.scientific.net/amm.723.972.

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The characteristics of chemisorptions, such as the pseudogap, forbidden bandwidth, energy curve, the trend of Fermi level in the graphics and the density of states at the Fermi level and so on, were given for the chemisorptions of atom on the Si (001) surface from the density of states. From these densities of states’ curves, the characteristics of chemisorptions were analyzed and compared to for different elements absorption on the Si (001) surface. The density of states for chemisorptions is different for the different elements.
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Tournayan, L., A. Auroux, H. Charcosset, and R. Szymanski. "Hydrogen and Oxygen Chemisorptions and Titrations by Platinum on Zirconia Catalysts Reduced between 673 and 1273 K." Adsorption Science & Technology 2, no. 2 (1985): 55–68. http://dx.doi.org/10.1177/026361748500200201.

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Some 10 wt % Pt supported on zirconia catalysts were investigated by hydrogen and oxygen chemisorptions and titrations by means of automated catharometric equipment (frontal method). Microcalorimetry was further used to determine the heats of oxygen chemisorption. The temperature of reduction by hydrogen, TR, was varied between 673 and 1273 K. At 673 K, the H and O coverages of Pt were about the same as for Pt supported on SiO2 (Euro Pt catalyst). The increase in TR from 673 to 873 K was accompanied by a strong decrease of the hydrogen to oxygen chemisorption ratio. It is proposed that this is
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Sutapa, I. Wayan, Ria Armunanto, and Karna Wijaya. "EFFECT OF SCANDIUM ON HIDROGEN DISSOCIATION ENERGY AT MAGNESIUM SURFACE: AB INITIO DFT STUDY." Indonesian Journal of Chemistry 10, no. 2 (2010): 184–88. http://dx.doi.org/10.22146/ijc.21458.

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The dissociative chemisorption of hydrogen on both pure and Sc-incorporated Mg(0001) surfaces have been studied by ab initio density functional theory (DFT) calculation. The calculated dissociation energy of hydrogen molecule on a pure Mg(0001) surface (1.200 eV) is in good agreement with comparable theoretical studies. For the Sc-incorporated Mg(0001) surface, the activated barrier decreases to 0.780 eV due to the strong interaction between the molecular orbital of hydrogen and the d metal state of Sc. This could explain the experimentally observed improvement in absorption kinetics of hydrog
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Ali, Sardar, Noor Asmawati Mohd Zabidi, and Duvvuri Subbarao. "Synthesis and Characterization of Bimetallic Fe/Co Nanocatalyst on CNTs for Fischer-Tropsch Reaction." Journal of Nano Research 16 (January 2012): 9–14. http://dx.doi.org/10.4028/www.scientific.net/jnanor.16.9.

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Cobalt and iron are common catalysts used in the Fischer-Tropsch (FT) reaction. This paper presents the synthesis and characterization of monometallic and bimetallic cobalt and iron nanoparticles supported on carbon nanotubes (CNTs). The CNTs-supported nanocatalysts were synthesized by a wet impregnation method at various ratios of Fe:Co. The physicochemical properties of the samples were analyzed by H2-temperature programmed reduction (TPR), CO and H2-chemisorption analyses, transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis. The effects of incorporation of Fe into Co
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Wu, Jun Fang. "The Density of States for Chemisorptions on Si (111) Surface." Advanced Materials Research 1061-1062 (December 2014): 315–18. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.315.

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The density of states was given for the chemisorptions of atom on the Si (111) surface. From these curves, the characteristics, such as the pseudogap, forbidden bandwidth, energy curve, the trend of Fermi level in the graphics and the density of states at the Fermi level and so on, were analyzed and compared to for different elements absorption on the Si (111) surface. The density of states for chemisorptions is different for the different elements.
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Jiang, P. H., H. J. Liu, D. D. Fan, et al. "Enhanced thermoelectric performance of carbon nanotubes at elevated temperature." Physical Chemistry Chemical Physics 17, no. 41 (2015): 27558–64. http://dx.doi.org/10.1039/c5cp04282h.

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Cárdenas Cortez, Olda Alexia, José de Jesús Pérez Bueno, Yolanda Casados Mexicano, et al. "CoO, Cu, and Ag Nanoparticles on Silicon Nanowires with Photocatalytic Activity for the Degradation of Dyes." Sustainability 14, no. 20 (2022): 13361. http://dx.doi.org/10.3390/su142013361.

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Photocatalytic semiconductors require maintaining stability and pursuing higher efficiencies. The studied systems were silicon nanowires (SiNWs), silicon nanowires with cobalt oxide nanoparticles (SiNWs-CoONPs), and silicon nanowires with copper nanoparticles (SiNWs-CuNPs). SiNWs were synthesized by metal-assisted chemical etching (MACE) from silicon wafers keeping the remaining silver nanoparticles for all three sample types. The nanowires were about 23–30 µm in length. CoONPs and CuNPs were deposited on SiNWs by the autocatalytic reduction processes (electroless). There were many factors in
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Zhang, Wen Xue, Xin Hu, Xiao Bin Lin, and Cheng He. "Zr-Catalyzed Hydrogen Chemisorptions on an Al Surface." Advanced Materials Research 197-198 (February 2011): 1096–99. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1096.

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The most promising hydrogen storage materials are perhaps complex metal hydrides. Thus, a plausible first step in the rehydrogenation mechanism is proposed by simulating the reversible hydrogen storage in Zr-doped NaAlH4. It provides insight into the catalytic role of Zr atoms on an Al surface in the chemisorptions of molecular hydrogen. It is found that the diffusion of hydride species on Al-metallic phase and formation of Al hydride species is probably the key to syntheses the next products in the rehydrogenation reaction.
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Wu, Jun Fang. "The Band Structures of Chemisorptions on Si (100) Surface." Advanced Materials Research 1061-1062 (December 2014): 311–14. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.311.

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The band structures were given by study on the chemisorptions of atom on the Si (100) surface. From these curves, the pseudogap, forbidden bandwidth, the trend of Fermi level in the graphics at the Fermi level were analyzed and compared for different elements absorption. The conclusion is that the electrical conductivity of Cu, Na is the best, followed by C, the last is the Si.
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Дисертації з теми "Chemisorptions"

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Batista, Ana Paula de Lima. "Adsorção química de átomos na superfície C(100)2x1 do diamante: um estudo teórico." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/46/46132/tde-20072010-164215/.

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O diamante, juntamente com o germânio e o silício, é um importante material para área de tecnologia de semicondutores e sua superfície C(100) é considerada a de maior interesse devido às várias possibilidades de aplicações tecnológicas. Neste trabalho, seguindo uma linha similar de estudos teóricos envolvendo clusters de silício, já estudados em nosso grupo, e utilizando o estado da arte em termos de cálculos de estrutura eletrônica, realizou-se uma investigação detalhada englobando aspectos estruturais e energéticos do aglomerado C9H12 nos estados singleto e tripleto, bem como as novas caract
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Burkart, Stefan. "Wasserstoff-Chemisorption an Metallclustern." [S.l. : s.n.], 2000. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8702553.

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Hüpen, Bernhard. "Rigorose Modellierung und Simulation von Chemisorptionsprozessen." München Verl. Dr. Hut, 2008. http://d-nb.info/992162882/04.

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Tong, A. W. L. "Chemisorption studies on Ni(100)." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384364.

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Stolčić, Davor. "Sauerstoff- und Stickstoff-Chemisorption an Metallclustern." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=966623207.

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Fitzpatrick, O. "CO and O chemisorption on platinium." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246565.

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Singh, N. K. "Chemisorption studies on single crystal nickel surfaces." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235360.

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Tang, Sau Lan. "Dynamics of chemisorption : CO on Ni(111)." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15289.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.<br>Includes bibliographical references.<br>by Sau Lan Tang.<br>Ph.D.
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Yang, Shizhong Phillips James M. "Ab initio and semiempirical studies of molecules adsorbed on surfaces." Diss., UMK access, 2006.

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Thesis (Ph. D.)--Dept. of Physics and School of Computing and Engineering. University of Missouri--Kansas City, 2006.<br>"A dissertation in physics and electrical engineering." Advisor: James M. Phillips. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Jan. 29, 2007. Includes bibliographical references (leaves 134-146). Online version of the print edition.
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Wight, Andrew Christopher. "Dissociative chemisorption of small molecules at Fe(110)." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321148.

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Книги з теми "Chemisorptions"

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Poredda, Andreas. Chemisorption an Siliziumoberflächen. [s.n.], 1992.

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2

Shethna, Hiren K. Thermodynamic analysis of chemisorption processes. UMIST, 1996.

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1936-, Wissmann P., ed. Thin metal films and gas chemisorption. Elsevier, 1987.

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4

Wolkenstein, T. Electronic Processes on Semiconductor Surfaces during Chemisorption. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3656-7.

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Morose, A. The electronic theory of chemisorption and catalysis. NTUU"KPI, 2008.

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Basnak, Gabriella. Microbially enhanced chemisorption of heavy metals(MECHM). University of Birmingham, 1998.

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Volḱenshteĭn, F. F. Electronic processes on semiconductor surfaces during chemisorption. Consultants Bureau, 1991.

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Wander, Adrian. Cluster studies of chemisorption using total energy techniques. typescript, 1989.

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Ruette, F., ed. Quantum Chemistry Approaches to Chemisorption and Heterogeneous Catalysis. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-2825-6.

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Fernando, Ruette Galvis, ed. Quantum chemistry approaches to chemisorption and heterogeneous catalysis. Kluwer Academic, 1992.

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Частини книг з теми "Chemisorptions"

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Jinguang, Che, Zhang Kaiming, and Xie Xide. "Chemisorptions of Ag, Cu and Au on Si(111) and Ge(111) Surfaces." In Proceedings of the 17th International Conference on the Physics of Semiconductors. Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4615-7682-2_26.

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Farrukh, Sarah, Xianfeng Fan, Kiran Mustafa, Arshad Hussain, Muhammad Ayoub, and Mohammad Younas. "Chemisorption." In Nanotechnology and the Generation of Sustainable Hydrogen. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60402-8_8.

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Gooch, Jan W. "Chemisorption." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2263.

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Charnley, Steven B. "Chemisorption." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_270.

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Lowell, S., and Joan E. Shields. "Chemisorption." In Powder Surface Area and Porosity. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7955-1_20.

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Charnley, Steven. "Chemisorption." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_270.

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Charnley, Steven B. "Chemisorption." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_270.

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Charnley, Steven B. "Chemisorption." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_270-3.

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Kłos, Ryszard. "Chemisorption." In Rebreathers In Diving Science. CRC Press, 2025. https://doi.org/10.1201/9781032649207-6.

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Ehrlich, Gert. "Activated Chemisorption." In Chemistry and Physics of Solid Surfaces VII. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73902-6_1.

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Тези доповідей конференцій з теми "Chemisorptions"

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Soriaga, Manuel P., G. M. Berry, C. Bhardwaj, et al. "Chemisorption of Organic Molecules on Metal Electrode Surfaces." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90300.

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Abstract The chemisorption of various organic functional groups from aqueous solutions onto smooth single-crystal and polycrystalline electrodes, and the resistance of the resulting monolayer intermediates towards electrochemical oxidation have been studied; these investigations were motivated by the need to understand, at the atomic level, metal passivation by monolayer organic coatings. The electrodes employed were Rh, Pd, Ir, Pt, and Au whose anodic dissolution is preceded by surface-oxide formation even in highly acidic media. Resistance towards anodic oxidation can thus be associated with
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Su, Yan-Jing, Yan-Bin Wang, and Wu-Yang Chu. "Mechanism of Liquid Metal Embrittlement for Aluminium in Hg+3at%Ga." In CORROSION 1998. NACE International, 1998. https://doi.org/10.5006/c1998-98255.

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Abstract Using a special TEM constant deflection device, the change in dislocation configuration ahead of a loaded crack tip before and after adsorbing of Hg atoms and the initiation of liquid metal-induced nanocrack (LMIC) has been observed. The results shown that chemisorption of Hg atoms could facilitate dislocation emission, multiplication and motion. Nanocracks will initiate in dislocation free zone (DFZ) or at the crack tip when chemisorption-facilitiated dislocation emission, multiplication and motion reach a critical condition. On the basis of the available experimental evidence concer
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Agarwala, V. S., and S. Hettiarachchi. "Porphyrins and Phthalocyanines for Corrosion Inhibition." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90442.

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Abstract The electronic structure and the chemical properties of porphyrin and phthalocyanine molecules suggest that they are capable of strong chemisorption at metallic surfaces. Thus, a number of different porphyrins, phthalocyanines and their metallo- derivatives were synthesized and studied. The corrosion and electrochemical studies showed their excellent potential for corrosion inhibition. The current studies have shown that "tailor-making" the molecules through modification of chemical structure, could transform them into most efficient corrosion inhibitors. The degree of inhibidon impro
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Pickering, Howard W., and Toshio Sakurai. "Scanning Tunneling Microscopy and Its Applications in Corrosion Science." In CORROSION 1991. NACE International, 1991. https://doi.org/10.5006/c1991-91081.

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Abstract Scanning tunneling microscopy (STM) is described with a view to its application for the study of corrosion reactions. The principles of STM are presented in terms of the theory, construction of the microscope including field ion capability for characterizing the probe tip, and its applications for characterizing surfaces. Recent results will be presented to illustrate its versatility for the study of surface structure, chemisorption and surface reactions, including the study of atomic hydrogen adsorption on the Si(111)-7 x 7 surface and real time (in-situ) studies of anodic copper dis
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Andreev, N. N., and Yu I. Kuznetsov. "Progress in the Fundamentals of Volatile Inhibitors of Atmospheric Corrosion of Metals." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04413.

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Abstract This paper presents a review of studies on volatile corrosion inhibitors (VCIs) for humid atmospheres. Emphasis is on the mechanisms of interaction of VCIs with the atmosphere and on methods for quantitative estimation of the volatility of organic compounds. The possibility of predicting the volatility of corrosion inhibitors based on their chemical structure and the scale of ξR-constants of substituents is analyzed. Corrosion initiation by mass and heat transfer in systems protected by VCIs is discussed. The importance of chemisorption in the efficiency of metal protection by VCIs an
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Agarwala, Vinod S., and Frederick R. Longo. "Corrosion and Physical Studies of Porphyrin-Treated Iron Surfaces." In CORROSION 1986. NACE International, 1986. https://doi.org/10.5006/c1986-86198.

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Abstract The Chemical and structural characteristics of porphyrins suggest that this class of molecules should offer protection of metallic surfaces by chemisorption. Therefore we have prepared and tested more than twenty-five different porphyrins and several of their metallo-derivatives. Corrosion and electrochemical studies have shown that the inhibition efficiency of a porphyrin improves (a) with its water-soluble nature, (b) with its conversion to a metalloderivative and (c) when applied by vapor deposition at temperatures above 300 C. Best corrosion inhibition (in 1% NaCl) was shown by te
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Bavarian, Bezad, and Lisa Reiner. "Current Progress in Corrosion Inhibition of Reinforcing Steel in Concrete Using Migrating Corrosion Inhibitors." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06347.

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Abstract Several migrating corrosion inhibitors for reinforced concrete were investigated using ASTM G109 and Modified G109. XPS depth profiling showed a 90-100 nm amine-rich layer and chloride ions on the steel rebar surfaces indicating that the modified corrosion inhibitor molecules had suppressed chloride ion interaction and protected the steel rebar passivation layer. There is no indication of corrosion after 400 days of testing. The inhibitor treated samples showed improved resistance polarization (Rp was in the 50 kohm to 60 kohm range, corrosion potentials ranged between -64 mV and -103
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Cocke, David L. "Investigation of Oxidation of Metals Using Surface Analytical Techniques." In CORROSION 1989. NACE International, 1989. https://doi.org/10.5006/c1989-89611.

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Abstract Since corrosion is primarily a surface or interface phenomenon and involves metal oxidation as the primary process its investigation by surface analytical techniques holds the keys to our reaching an understanding of corrosion at the the atomic level. This paper examines the post- chemisorption processes that influence metal and alloy oxidation. It surveys some specific applications of surface techniques using x-ray photons, electrons, ions and fields to metal oxidation. Several major aspects of the metal oxidation process will be stressed. First, in the speciation of elementary steps
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Loto, C. A., O. O. Joseph, R. T. Loto, and Joshua Olusegun Okeniyi. "Adsorption and Inhibitive Properties of Camellia Sinensis for Mild Steel in 0.5M HCl and 0.8M H2SO4." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05655.

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Abstract The effect of Camellia Sinensis (green tea) extract as a ‘green’ inhibitor on mild steel corrosion in 0.5M HCl and 0.8M H2SO4 was studied at ambient temperature. Weight loss/corrosion rate and potential measurement techniques were used for the experimental work. The results were further analyzed using the two-factor ANOVA. Potential measurement was performed using a digital voltmeter and a saturated calomel reference electrode. Results obtained showed effective corrosion-inhibition of the extract on the mild steel test-specimens in the different concentrations of HCl and H2SO4 used. T
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Aljeaban, Norah, Nurudeen A. Odewunmi, Bader Alharbi, Mohammad A. Jafar Mazumde, Salem Balharth, and Shaikh A. Ali. "Investigation of Electrochemical Corrosion Inhibition of N, N′-(1, 4-Phenylenebis(methyl)) Bis(N,N-Dimethylalkan-1-Aminium) Chloride on API 5L X60 Steel in Acidic Media." In CORROSION 2020. NACE International, 2020. https://doi.org/10.5006/c2020-14723.

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Abstract The application of corrosion inhibitors (CI) to producing oil and gas field systems is one of the most common practices of corrosion control. Acid stimulation fluids such as hydrochloric acid (HCl) and organic acids has high calcite and dolomite dissolving power; however, pumping HCl downhole during acid stimulation process particularly at elevated temperatures can cause severe corrosion. Therefore, the addition of corrosion inhibitors is indispensable to protect the metal from corrosion. More inhibitors that are efficacious are still needed to provide better protection against the co
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Звіти організацій з теми "Chemisorptions"

1

Jongpatiwut, Siriporn, Somchai Osuwan, Thirasak Rirksomboon, and ชมพูนุท พึ่งกลั่น. n-alkane aromatization over modified Pt supported KL zeolites. Chulalongkorn University, 2013. https://doi.org/10.58837/chula.res.2013.94.

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From previous studies, Sn-promoted Pt/KL prepared by vapor-phase co-impregnation exhibited high stability and selectivity to C8-aromatics for n-octane aromatization. Although the Pt/KL has many benefits, one of the serious drawbacks is its sensitivity to sulfur poisoning. Based on previous investigations, the addition of rare earth elements (RE; e.g. Tm, Ce, and Dy) into Pt/KL could improve sulfur tolerance of the catalysts. In this work, the sulfur resistance of PtSn/KL and RE-promoted PtSn/KL has been studied. PtSnRE/KL catalysts with Pt:Sn:RE ratio of 1:1:0.15 were prepared by sequential RE
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2

Rundberg, Robert S. Radiochemistry and the Study of Chemisorption. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1116689.

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3

Furimsky, E., D. Henson, J. F. Gransden, and J. T. Price. Characterization of coals by oxygen chemisorption technique. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/302637.

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4

Daley, R., and R. Musket. Hydrogen chemisorption on diamond surfaces. Final report. Office of Scientific and Technical Information (OSTI), 1994. http://dx.doi.org/10.2172/86911.

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5

Roldan-Cuenya, Beatriz, H. Mistry, and Y. Choi. Nanocatalysis: Size- and Shape-dependent Chemisorption and Catalytic Reactivity. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1485534.

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6

Hajduk, J. On the topic of single and multicomponent chemisorption isotherms. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/5387731.

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7

Whitten, J. L. Theoretical studies of chemisorption and surface reactions on nickel and silicon. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/6340677.

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8

Whitten, J. Theoretical studies of chemisorption and surface reactions on nickel and silicon. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/5173980.

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9

Yates, J. T. Jr. Vibrational spectroscopic studies of surface chemical interactions in chemisorption and catalysis. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5630771.

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10

Koel, B. (Chemisorption and reactions studies on well-characterized bimetallic and alloy surfaces). Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/5925859.

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