scholarly journals γ-Radiolysis of cyclohexane with electron scavengers. VII. Perfluorocyclohexane and perfluorobenzene as electron scavengers

1969 ◽  
Vol 47 (14) ◽  
pp. 2655-2660 ◽  
Author(s):  
N. H. Sagert ◽  
J. A. Reid ◽  
R. W. Robinson
Keyword(s):  
Liquid Phase ◽  
Electron Capture ◽  
Room Temperature ◽  
Large Change ◽  
Electron Scavenger ◽  
Free Ion ◽  
Neutralization Process ◽  
Temperature Liquid

The room temperature, liquid phase radiolysis of cyclohexane has been investigated using perfluorocyclohexane (C6F12) and perfluorobenzene (C6F6) as electron scavengers. Yields of the respective monohydrofluorocarbons were investigated over several orders of magnitude scavenger concentration. The C6F11H yield from the C6F12–cyclohexane system has previously been shown to result from electron capture by C6F12. The data over the extended concentration range were used to calculate a total ion yield of 4.3 ± 0.2 G units and a free ion yield of 0.14 ± 0.02 G units. With C6F6 as an electron scavenger, hydrogen, cyclohexene, and dicyclohexyl yields were all reduced. However, C6F5H yields were much lower than the C6F11H yields from C6F12. On changing the neutralization step by adding the proton scavenger ethanol, C6F5H yields were obtained equal to the C6F11H yields from C6F12. Thus C6F6 is as efficient an electron scavenger as C6F12. Since a change in the neutralization process produces a large change in yield, it is likely that C6F5H (or C6F5) is produced in the neutralization process.

γ-Radiolysis of hydrocarbons using perfluorocyclohexane as an electron scavenger: determination of the free ion yields

1970 ◽  
Vol 48 (15) ◽  
pp. 2429-2432 ◽  
Author(s):  
N. H. Sagert ◽  
J. A. Reid
Keyword(s):  
Liquid Phase ◽  
Room Temperature ◽  
Electron Scavenger ◽  
Free Ion ◽  
Temperature Liquid ◽  
Ion Yields ◽  
Good Agreement

The room temperature, liquid phase radiolysis of n-hexane, 3-methylpentane, and 2,2,4-trimethyl-pentane has been examined using perfluorocyclohexane as an electron scavenger. Yields of C6F11H and C6F11CH3 were determined for scavenger concentrations below 5 × 10−3 M, and from these results free ion yields of 0.08, 0.17, and 0.37 G units were deduced for n-hexane, 3-methylpentane, and 2,2,4-trimethylpentane, respectively. These results are in good agreement with those obtained by other methods.

γ-Radiolysis of cyclohexane with electron scavengers. IV. CO2 as an electron scavenger

1968 ◽  
Vol 46 (2) ◽  
pp. 336-338 ◽  
Author(s):  
N. H. Sagert
Keyword(s):  
Liquid Phase ◽  
Room Temperature ◽  
Electron Scavenger ◽  
Rate Of Reaction ◽  
Temperature Liquid

The room temperature liquid phase radiolysis of cyclohexane has been examined in the presence of CO2 and of CO2 with N2O. CO2 decreases the yields of all major products by scavenging electrons. It is concluded that the CO2 anion does not dissociate and that no precursors of cyclohexyl radicals are formed when it is finally neutralized by a hydrocarbon cation. No evidence that CO2 acts as an efficient O− scavenger in liquid phase cyclohexane was found. Its rate of reaction with O− appears comparable to its rate of reaction with electrons.

γ-Radiolysis of cyclohexane with electron scavengers. III. Perfluorocarbons as electron scavengers

1968 ◽  
Vol 46 (2) ◽  
pp. 95-99 ◽  
Author(s):  
N. H. Sagert
Keyword(s):  
Liquid Phase ◽  
Electron Capture ◽  
Solid Solutions ◽  
Room Temperature ◽  
Dissociative Electron Capture ◽  
Bond Breaking ◽  
Hydrogen Yield ◽  
Fluorocarbon Compounds ◽  
Temperature Liquid

The room temperature, liquid phase radiolysis of cyclohexane in the presence of three solutes, per fluorocyclohexane (PCH), perfluoromethylcyclohexane (PMCH), and perfluorocyclobutane (PCB) has been examined. All decrease the hydrogen yield from 5.6 to 2.6 G units by capturing electrons. However, with PMCH and PCB the yields of cyclohexene and bicyclohexyl are not decreased as much as the hydrogen yield and with PCH, dimer and olefin yields are increased. Furthermore, large yields of monohydrofluorocarbon (e.g. undecafluorocyclohexane) are produced, indicating that a carbon–fluorine bond has been broken. It is concluded that electron capture by these fluorocarbon compounds causes dissociation; possible mechanisms are discussed, but it was not possible to reach a clear conclusion on the basis of our results.The radiolysis of homogeneous solid solutions of these solutes at 77 °K has also been studied, but only PMCH was studied in detail. Under these conditions there is no evidence for dissociative electron capture and apparently the combination of solute anion and hydrocarbon cation on warming does not lead to bond breaking.

Near Room-Temperature Liquid-Phase Deposition of Barium-Doped TiO2 on n-GaN and its Application to AlGaN/GaN MOSHEMTs

2019 ◽  
Vol 41 (3) ◽  
pp. 439-444 ◽  
Author(s):  
Chih C. Hu ◽  
Mon-Sen Lin ◽  
Tsu-Yi Wu ◽  
Feri Adriyanto ◽  
Po-Wen Sze ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Room Temperature ◽  
Liquid Phase Deposition ◽  
Doped Tio2 ◽  
Temperature Liquid

Effect of Electron Scavenger on the γ-Radiolysis of Gaseous Propane at High Densities

1973 ◽  
Vol 51 (23) ◽  
pp. 3966-3969 ◽  
Author(s):  
Masaru Nishikawa ◽  
Yoh-ichi Yamaguchi ◽  
Kazuo Fujita ◽  
Kazunori Kon ◽  
Tetsuro Okamoto
Keyword(s):  
Liquid Phase ◽  
Room Temperature ◽  
High Density ◽  
Hydrogen Formation ◽  
Electron Pairs ◽  
Electron Scavenger ◽  
Similar Decrease

Hydrogen formation from γ-radiolysis of gaseous propane at 120 ± 1 °C was studied as the function of density in the range from 0.1 to 0.5 g/ml. G(H2) gradually decreased with density from 8.0 at 0.12 g/ml towards the liquid-phase value of 6.4 at room temperature. G(H2) in the presence of SF6 showed similar decrease from 3.9 to 3.0. The decrease was discussed in comparison to the abrupt drop in G-values from the radiolysis of ammonia at high density (11). The separation distances of ion–electron pairs were estimated from the analysis of the electron scavenging reaction.

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