Changes in structural characteristics of LLDPE functionalized with DEM using gamma-irradiation

2011 ◽  
Vol 124 (2) ◽  
pp. 1106-1116 ◽  
Author(s):  
R. Perera ◽  
C. Albano ◽  
Y. Sánchez ◽  
A. Karam ◽  
P. Silva ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Structural Characteristics

scholarly journals Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Huemantzin B. Ortiz-Oliveros ◽  
Rosa Ma. Flores Espinosa ◽  
Pedro Ávila-Pérez ◽  
Daniel Cruz-Gonzalez ◽  
Noureddine Ouerfelli
Keyword(s):  
Radioactive Waste ◽  
Gamma Irradiation ◽  
Physical Parameter ◽  
Structural Characteristics ◽  
Dipole Interaction ◽  
Maximum Activity ◽  
Surface Complexes ◽  
Optimal Value ◽  
Crystalline Metal ◽  
Spontaneous Reaction

Perovskites, such as tausonite, are crystalline metal oxides with excellent optical and photocatalytic properties and have also been used successfully in the retention of metals, simulating the isotopes of uranium and plutonium. In this work, different pseudo-order and thermodynamic models were studied to achieve the prediction of the sorption of Eu3+ (chemical analogous for actinides) in tausonite. The effects of gamma irradiation and temperature on the structural characteristics of the material were determined, as an additional step in the evaluation of material as an engineering barrier in the disposal of radioactive waste. The results obtained show that the tausonite is resistant to the gamma irradiation and thermal energy. Likewise, it was possible to determine that europium sorption occurs through an exothermic and spontaneous reaction, as well as through the formation of surface complexes, where Eu3+ ions bind to sites on the tausonite by dipole-dipole interaction. Furthermore, it was shown that the sorption mechanism is influenced by diffusive phenomena, which participate in the formation of surface complexes. Additionally, a new sorption model with respect to pH was proposed, which allowed determining the physical parameter π. The evidence obtained suggests that π is a physical parameter that relates pH to an optimal value and could explain the equilibrium between the surface complexes that tausonite forms with europium. Likewise, the evidence suggests that 50 kg of tausonite would have the capacity to retain at least 26.59 g of alpha-emitting radionuclides, equivalent to a waste package (900 kg) with a maximum activity of 4000 Bq/g.

Effect of gamma-irradiation on some structural characteristics of NiO

1989 ◽  
Vol 33 (1) ◽  
pp. 19-22
Author(s):  
A.M. El-Shabiny ◽  
G.A. El-Shobaky ◽  
A.M. Dessouki ◽  
A.A. Ramadan
Keyword(s):  
Gamma Irradiation ◽  
Structural Characteristics

Structural characteristics and bonding environment of Ag nanoparticles synthesized by gamma irradiation within thermo-responsive poly(N -isopropylacrylamide) hydrogel

2015 ◽  
Vol 38 (5) ◽  
pp. 1014-1026 ◽  
Author(s):  
Jelena Spasojević ◽  
Aleksandra Radosavljević ◽  
Jelena Krstić ◽  
Miodrag Mitrić ◽  
Maja Popović ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Ag Nanoparticles ◽  
Structural Characteristics

A High Resolution Study of G.P. Zones in Aluminum - 4.2 at % Silver

1982 ◽  
Vol 40 ◽  
pp. 722-723 ◽  
Author(s):  
R. Gronsky
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Computer Simulations ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Resolution Study

The phenomenon of clustering in Al-Ag alloys has been extensively studied since the early work of Guinierl, wherein the pre-precipitation state was characterized as an assembly of spherical, ordered, silver-rich G.P. zones. Subsequent x-ray and TEM investigations yielded results in general agreement with this model. However, serious discrepancies were later revealed by the detailed x-ray diffraction - based computer simulations of Gragg and Cohen, i.e., the silver-rich clusters were instead octahedral in shape and fully disordered, atleast below 170°C. The object of the present investigation is to examine directly the structural characteristics of G.P. zones in Al-Ag by high resolution transmission electron microscopy.

SEM analysis of the change in the reaction rates with deposit structures in the copper-iron cementation system

1978 ◽  
Vol 36 (1) ◽  
pp. 456-457
Author(s):  
V. Annamalai ◽  
L.E. Murr
Keyword(s):  
Structural Characteristics ◽  
Secondary Electron Emission ◽  
Copper Deposit ◽  
Reaction Rates ◽  
Sem Analysis ◽  
Experimental Conditions ◽  
Major Drawback ◽  
Emission Mode ◽  
Scrap Iron ◽  
Image Position

Economical recovery of copper metal from leach liquors has been carried out by the simple process of cementing copper onto a suitable substrate metal, such as scrap-iron, since the 16th century. The process has, however, a major drawback of consuming more iron than stoichiometrically needed by the reaction.Therefore, many research groups started looking into the process more closely. Though it is accepted that the structural characteristics of the resultant copper deposit cause changes in reaction rates for various experimental conditions, not many systems have been systematically investigated. This paper examines the deposit structures and the kinetic data, and explains the correlations between them.A simple cementation cell along with rotating discs of pure iron (99.9%) were employed in this study to obtain the kinetic results The resultant copper deposits were studied in a Hitachi Perkin-Elmer HHS-2R scanning electron microscope operated at 25kV in the secondary electron emission mode.

Use of 2½ D imaging in analysis of NiTi martensite

1978 ◽  
Vol 36 (1) ◽  
pp. 610-611
Author(s):  
G. M. Michal
Keyword(s):  
Memory Effect ◽  
Monoclinic Phase ◽  
Reaction Path ◽  
Structural Characteristics ◽  
Salient Feature ◽  
Martensite Phase ◽  
Orientation Relationships ◽  
Low Symmetry ◽  
Hydride Phases ◽  
Unusual Shape

Several TEM investigations have attempted to correlate the structural characteristics to the unusual shape memory effect in NiTi, the consensus being the essence of the memory effect is ostensible manifest in the structure of NiTi transforming martensitic- ally from a B2 ordered lattice to a low temperature monoclinic phase. Commensurate with the low symmetry of the martensite phase, many variants may form from the B2 lattice explaining the very complex transformed microstructure. The microstructure may also be complicated by the enhanced formation of oxide or hydride phases and precipitation of intermetallic compounds by electron beam exposure. Variants are typically found in selfaccommodation groups with members of a group internally twinned and the twins themselves are often observed to be internally twinned. Often the most salient feature of a group of variants is their close clustering around a given orientation. Analysis of such orientation relationships may be a key to determining the nature of the reaction path that gives the transformation its apparently perfect reversibility.

Use of light microscopy in the qualitative and quantitative study of liquid crystalline order

1992 ◽  
Vol 50 (1) ◽  
pp. 264-265
Author(s):  
Christopher Viney
Keyword(s):  
Light Microscopy ◽  
Liquid Crystalline ◽  
Structural Characteristics ◽  
Molecular Order ◽  
Liquid Crystalline Phases ◽  
Convenient Technique ◽  
Liquid Crystalline Materials ◽  
Transparent Windows

Light microscopy is a convenient technique for characterizing molecular order in fluid liquid crystalline materials. Microstructures can usually be observed under the actual conditions that promote the formation of liquid crystalline phases, whether or not a solvent is required, and at temperatures that can range from the boiling point of nitrogen to 600°C. It is relatively easy to produce specimens that are sufficiently thin and flat, simply by confining a droplet between glass cover slides. Specimens do not need to be conducting, and they do not have to be maintained in a vacuum. Drybox or other controlled environmental conditions can be maintained in a sealed chamber equipped with transparent windows; some heating/ freezing stages can be used for this purpose. It is relatively easy to construct a modified stage so that the generation and relaxation of global molecular order can be observed while specimens are being sheared, simulating flow conditions that exist during processing. Also, light only rarely affects the chemical composition or molecular weight distribution of the sample. Because little or no processing is required after collecting the sample, one can be confident that biologically derived materials will reveal many of their in vivo structural characteristics, even though microscopy is performed in vitro.

Ascidian Mitochondrial tRNAMet Possessing Unique Structural Characteristics

1998 ◽  
Vol 17 (1) ◽  
pp. 531-539 ◽  
Author(s):  
Akiko Kondow ◽  
Shin-ichi Yokobori ◽  
Takuya Ueda ◽  
Kimitsuna Watanabe
Keyword(s):  
Structural Characteristics

Content and Structural Characteristics of Thought Processes During Hypnosis

1970 ◽  
Author(s):  
Mark I. Oberlander ◽  
Doris Gruenewald ◽  
Erika Fromm
Keyword(s):  
Structural Characteristics ◽  
Thought Processes

Comparative study of the oxidation of low and high density lipoproteins exposed to gamma-irradiation

1997 ◽  
Vol 94 ◽  
pp. 365-370 ◽  
Author(s):  
A Khalil ◽  
JR Wagner ◽  
T Fülöp Jr
Keyword(s):  
Comparative Study ◽  
Gamma Irradiation ◽  
High Density ◽  
High Density Lipoproteins
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