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Anghel, Ioana Maria; Lazar, Roxana; Stefanescu, Ioan; Catalin, Ducu, E-mail: cvarlam@icsi.ro
The 10-th ICSI Conference 'Progress in Cryogenics and Isotope Separation'. Proceedings2004
The 10-th ICSI Conference 'Progress in Cryogenics and Isotope Separation'. Proceedings2004
AbstractAbstract
[en] A study of the phenomenon of quantum sieving was carried out, referring at the main application of this process in the separation of isotopes field. Nanotubes, carbonic materials and zeolites seem to be very good candidates as adsorbents in the case of quantum sieving. Starting with the properties of these materials, especially their porosities, a mathematic model has been constructed for the calculus of the separation factor. (authors)
Primary Subject
Source
Stefanescu, Ioan (ed.) (National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (Romania)); National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (Romania). Funding organisation: Ministry of Education and Research, Bucharest (Romania); 253 p; ISSN 1582-2575;
; 2004; p. 230; 10. ICSI conference 'Progress in Cryogenics and Isotope Separation'; Caciulata (Romania); 14-15 Oct 2004; Available from author(s) or National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (RO); Available from National Institute of Research-Development for Cryogenics and Isotopic Technologies, ICSI, PO Box 10, Str. Uzinei nr. 4, RO-1000 Rm. Valcea (RO); Short communication

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AbstractAbstract
[en] Investigations were conducted in a batch reactor system to study the adsorption behavior of four anionic dyes (Methyl orange (MO), Orange IV (OIV), Reactive brilliant red X-3B (X-3B), and Acid fuchsine (AF)) on ammonium-functionalized MCM-41 (NH3+-MCM-41) from aqueous medium by varying the parameters such as contact time, initial dye concentration, pH and competitive anions. Dye adsorption was broadly independent of initial dye concentration. The intraparticle diffusion model was the best in describing the adsorption kinetics for the four anionic dyes on NH3+-MCM-41. The adsorption data for the four dyes were well fitted with the Langmuir model. The electrostatic interaction was considered to be the main mechanism for the dye adsorption. Finally, it was observed that the anion of soft acid inhibited the adsorption capacity significantly
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S0304-3894(08)00702-4; Available from http://dx.doi.org/10.1016/j.jhazmat.2008.05.016; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Vardashko, T.; Nidetska, Yu.
Research on desactivation of liquid, solid and gaseous radioactive wastes and decontamination of surfaces. Proceedings of the 4-th scientific and technical conference of CMEA. Moscow, 20 - 23 Dec 19761978
Research on desactivation of liquid, solid and gaseous radioactive wastes and decontamination of surfaces. Proceedings of the 4-th scientific and technical conference of CMEA. Moscow, 20 - 23 Dec 19761978
AbstractAbstract
[en] The results are presented of the sorptive properties investigations of the molecular sieves with respect to krypton-85. The investigations have been done for impravement of the methodology for measuring of krypton-85 concentration in the atmosphere air and for determination of small volumes of concentrate activity. The molecular sieve with the grain size of 1.0 - 1.5 mm was used. Krypton adsorption was going on at the liquid nitrogene temperature (-196 deg C). Description is given of the devices for krypton-85 adsorption and measuring of the gases activity and also of the methodology for the experiment conducting. Dependances are given of the desorbed krypton amounts on different factors of the process proceeding. (I.T.)
[ru]
Original Title
Sorbtsiya kriptona-85 na molekulyarnykh sitakh
Primary Subject
Source
Sovet Ehkonomicheskoj Vzaimopomoshchi, Moscow (USSR). Postoyanniya Komissiya po Ispol'zovaniyu Atomnoj Ehnergii v Mirnykh Tselyakh; p. 62-66; 1978; p. 62-66; Atomizdat; Moscow; 4-th scientific and technical conference of CMEA; Moscow, USSR; 20 - 23 Dec 1976; 7 ref.; 8 fig.
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AbstractAbstract
No abstract available
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Dec 1995; 196 p; Available from British Library Document Supply Centre- DSC:D199922; Thesis (Ph.D.)
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Quiroz, Alberto Garcia; Mansanares, A. M.; Silva, E.C. da; Alves, M.; Pastore, H.O.
Proceedings of the 24. Brazilian national meeting on condensed matter physics2001
Proceedings of the 24. Brazilian national meeting on condensed matter physics2001
AbstractAbstract
No abstract available
Original Title
Estudo in situ de ions de Fe3+ em peneiras moleculares MCM-41 aplicando ressonancia paramagnetica eletronica
Source
Sociedade Brasileira de Fisica, Sao Paulo, SP (Brazil); [vp.]; 2001; 1 p; 24. Brazilian national meeting on condensed matter physics; 24. Encontro nacional de fisica da materia condensada; Sao Lourenco, MG (Brazil); 15-19 May 2001; Available from http://www.sbf1.sbfisica.org.br/eventos/enfmc/xxiv/programa/res0232.pdf; Also available from the Nuclear Information Center of the Brazilian Nuclear Energy Commision, Rio de Janeiro
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[en] Carbon deposition process on activated carbon (AC) in order to produce carbon molecular sieve (CMS) was simulated using molecular dynamics simulation. The proposed activated carbon for simulation includes micropores with different characteristic diameters and lengths. Three different temperatures of 773 K, 973 K, and 1,273 K were selected to investigate the optimum deposition temperature. Simulation results show that the carbon deposition process at 973 K creates the best adsorbent structure. While at lower temperature some micropore openings are blocked with carbon atoms, at higher temperature the number of deposited carbons on the micropores does not change significantly. Also, carbon deposition process confirms the pseudo-second-order kinetic model with an endothermic behavior. To evaluate the sieving property of adsorbent products, nitrogen and oxygen adsorption on the initial and final adsorbent products are examined. Results show that there is not any considerable difference between the equilibrium adsorption amounts of nitrogen and oxygen on the initial and final adsorbents especially at low pressure (P<10 atm). Although, adsorption kinetics curves of these gases change significantly after the carbon deposition process in comparison with the initial sample. These observations indicate that the final adsorbent has high selectivity towards oxygen compared with the nitrogen, so it can be called a carbon molecular sieve. All simulated results are in good agreement with experiments
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47 refs, 11 figs, 3 tabs
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Journal Article
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Korean Journal of Chemical Engineering; ISSN 0256-1115;
; v. 32(3); p. 494-500

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Ye, Hongfei; Zheng, Yonggang; Zhang, Hongwu; Chen, Zhen; Zhang, Zhongqiang, E-mail: zhanghw@dlut.edu.cn, E-mail: ChenZh@missouri.edu2016
AbstractAbstract
[en] Precisely controlling the deformation of carbon nanotubes (CNTs) has practical application in the development of nanoscale functional devices, although it is a challenging task. Here, we propose a novel method to guide the deformation of CNTs through filling them with salt water and applying an electric field. With the electric field along the axial direction, the height of CNTs is enlarged by the axial electric force due to the internal ions and polar water molecules. Under an electric field with two mutually orthogonal components, the transverse electric force could further induce the bending deformation of CNTs. Based on the classical rod and beam theories, two mechanical models are constructed to verify and quantitatively describe the relationships between the tension and bending deformations of CNTs and the electric field intensity. Moreover, by means of the electric field-driven tension behavior of CNTs, we design a stretchable molecular sieve to control the flow rate of mixed gas and collect a single high-purity gas. The present work opens up new avenues in the design and fabrication of nanoscale controlling units. (paper)
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Available from http://dx.doi.org/10.1088/0957-4484/27/31/315702; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Nanotechnology (Print); ISSN 0957-4484;
; v. 27(31); [9 p.]

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Singh, V.P.
Canadian Fusion Fuels Technology Project, Toronto, Ontario1984
Canadian Fusion Fuels Technology Project, Toronto, Ontario1984
AbstractAbstract
[en] Molecular sieve driers have been included in the design of tritium handling systems for fusion reactors. In these systems there is a need to maintain extremely low exit dew points from the driers as well as a capability to rapidly reduce tritium concentrations following an accident. The required capacity of the driers is very high. The conventional method of regenerating these sieves after a water adsorption cycle is with hot air. However, because water is rapidly heated by microwave energy, this technology may be suitable for decreasing the bed regeneration time and hence may allow reduced capital and operating costs associated with a smaller bed. The present study was conducted to obtain preliminary information on the technical feasibility of regenerating molecular sieves with microwave energy. The study concentrated on Type 4A molecular sieve with a few tests on Type 13X sieve and also a silica gel adsorbent
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May 1984; 33 p
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AbstractAbstract
[en] Zeolites receive great attention among researchers today primarily because of their numerous industrial uses and applications, ranging from water treatment to petroleum industries, concerning adsorption, molecular sieving and/or catalysis. Some important progress taking place during the last few years - theoretical and experimental are discussed. In Indonesia, zeolites of natural origin are found in many places including the western and eastern part of Java Island. Works preparing, modifying and characterizing their performance whether by spectroscopic, thermochemical or volumetric methods are presented. Cooperation in R and D is still to be seriously and constantly increased/intensified. (Auth.). 22 refs.; 10 figs.; 2 tabs
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Department of Science and Technology, Taguig, Metro Manila (Philippines); 4 v; 1989; v. 3 p. 283-292; ASEAN COST/DOST; Manila (Philippines); 2. Association of Southeast Asian Nations (ASEAN) Science and Technology Week; Manila (Philippines); 30 Jan - 4 Feb 1989
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Book
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Sabzian, M.; Nasrabadi, M.N.; Haji-Hosseini, M., E-mail: mnnasrabadi@ast.ui.ac.ir2018
AbstractAbstract
[en] Highlights: • The modified wheeler-Jonas equation applied to calculate adsorption parameters of xenon on molecular sieves. • Experimental results confirmed the predicted adsorption parameter values. • Simplified radioactive xenon enrichment and analysis setup have been developed. - Abstract: The dynamic adsorption of xenon on molecular sieve packed columns was investigated. The modified Wheeler-Jonas equation was used to describe adsorption parameters such as adsorption capacity and adsorption rate coefficient. Different experimental conditions were accomplished to study their effects and to touch appropriate adsorbing circumstances. Respectable consistency was reached between experimental and modeled values. A purification and analysis setup was developed for radioactive xenon gas determination. Standard sample analysis results approved acceptable quantification accuracy.
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S0265931X18301668; Available from http://dx.doi.org/10.1016/j.jenvrad.2018.05.004; © 2018 Elsevier Ltd. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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