The Stability of Ethylene Oxide

1953 ◽  
Vol 23 (6) ◽  
pp. 368-369 ◽  
Author(s):  
E. MILTON WILSON
Keyword(s):  
Ethylene Oxide ◽  
The Stability

Effect of the incorporation of poly(ethylene oxide) copolymer on the stability of perovskite solar cells

2020 ◽  
Vol 8 (28) ◽  
pp. 9697-9706 ◽  
Author(s):  
Jeann Carlos da Silva ◽  
Francineide Lopes de Araújo ◽  
Rodrigo Szostak ◽  
Paulo Ernesto Marchezi ◽  
Raphael Fernando Moral ◽  
...  
Keyword(s):  
Solar Cells ◽  
Ethylene Oxide ◽  
Perovskite Solar Cells ◽  
Cell Stability ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
The Stability ◽  
P Addition

Addition of poly(ethylene oxide-co-epichlorohydrin) to MAPbI3 perovskite film enhanced cell stability under aggressive moisture exposure and prevented degradation from light.

The effect of methanol on the stability of clathrate hydrates

1981 ◽  
Vol 59 (17) ◽  
pp. 2587-2590 ◽  
Author(s):  
D. W. Davidson ◽  
S. R. Gough ◽  
J. A. Ripmeester ◽  
Haruo Nakayama
Keyword(s):  
Ethylene Oxide ◽  
Clathrate Hydrates ◽  
Nmr Studies ◽  
The Stability

From the effect of added methanol on the decomposition temperatures of the clathrate hydrates of ethylene oxide and tetrahydrofuran, it was recently reported that methanol can be readily enclathrated in hydrates of both structure I and II. Dielectric and nmr studies of these two hydrates prepared in the presence of methanol do not support this conclusion. It is shown thermodynamically that the original measurements may be interpreted without the need for incorporation of methanol in the hydrates formed.

scholarly journals The stability of emulsions in the presence of additives

2002 ◽  
Vol 67 (1) ◽  
pp. 31-40 ◽  
Author(s):  
S. Gasic ◽  
Bratislav Jovanovic ◽  
S. Jovanovic
Keyword(s):  
Ethylene Oxide ◽  
Ethylene Glycol ◽  
Homologous Series ◽  
Opposite Effect ◽  
General Trend ◽  
Inversion Point ◽  
The Stability ◽  
Index Value ◽  
Phenol Index

The influence of different additives on the effectiveHLBvalues of non-ionic emulsifiers was studied by the method of the determination of the phenol index values and by the determination of the emulsion inversion point in the system with xylene as the oil phase. Ethanol, glycerol and ethylene glycol were investigated as additives. The method of the determination of the phenol index value was applied on two homologous series of non-ionic emulsifiers: nonylphenolpolyglycolethers with 10, 15, 23 and 30 moles of bound ethylene oxide and polyglycolethers of fatty alcohols (C16?C18) with 15, 20 and 23 moles of bound ethylene oxide. The additives were applied in the concentration of 5, 10, 15 and 20 %. The results showed that ethanol and ethylene glycol increased the phenol index value. The influence of ethanol was more pronounced. On the contrary, glycerol reduces the phenol index value. There were small differences in the influence of these additives on certain members of both homologous series, but the general trend is presented here. The influence of the same additives on the values of the emulsion inversion point was investigated in the system with xylene and nonylphenolpolyglycolethers with 10 moles of bound ethylene oxide. Ethanol and ethylene glycol were applied in the concentrations of 1, 5, 10 and 15 % and glycerol in 5,7.5,10 and 15 %. The results showed that ethanol and ethylene glycol reduce the emulsion inversion points, while glycerol increases them. On the basis of these investigations it can be concluded that ethanol and ethylene glycol could contribute to an increase in the stability of emulsions, glycerol has the opposite effect. The results of both applied methods are in accordance.

Density-functional investigation of the geometric and electronic structure of ethylene oxide adsorbed on Si(100)

2016 ◽  
Vol 30 (19) ◽  
pp. 1650116 ◽  
Author(s):  
Lu Wang ◽  
Qing-Fang Li ◽  
Cui-Hong Yang ◽  
Yue-Ling Wei ◽  
Xing-Feng Zhu ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Electronic Structures ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Membered Ring ◽  
Stable Conformation ◽  
Ring Opening Reaction ◽  
Semiconductor Compounds ◽  
The Stability ◽  
Functional Investigation

The geometric and electronic structures of the ethylene oxide (EO) molecule adsorbed on Si(100)-[Formula: see text] surface were investigated by using the density-functional theory calculations. All possible adsorbed structures were considered and it was found that only four adsorption structures are stable. The calculations of the formation energy revealed the most stable conformation and demonstrated that the nature of Si–O bond significantly affects the stability of adsorption systems. The analysis of corresponding electronic structures showed that two adsorbed structures are still semiconductor compounds but the other two are not. In particular, the EO after adsorbing was found to be connected via a ring-opening reaction where the molecule forms a five-membered ring together with the surface of dimer silicon atoms, and the produced five-membered ring is almost perpendicular to the silicon surface.

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

Symmetric Multistep Methods Revisited: II. Numerical Experiments

1999 ◽  
Vol 173 ◽  
pp. 309-314 ◽  
Author(s):  
T. Fukushima
Keyword(s):  
Multistep Methods ◽  
Computational Time ◽  
Integration Time ◽  
Implicit Methods ◽  
Symmetric Methods ◽  
Celestial Bodies ◽  
The Stability ◽  
Predictor Corrector ◽  
Symmetric Multistep Methods ◽  
Integration Errors

AbstractBy using the stability condition and general formulas developed by Fukushima (1998 = Paper I) we discovered that, just as in the case of the explicit symmetric multistep methods (Quinlan and Tremaine, 1990), when integrating orbital motions of celestial bodies, the implicit symmetric multistep methods used in the predictor-corrector manner lead to integration errors in position which grow linearly with the integration time if the stepsizes adopted are sufficiently small and if the number of corrections is sufficiently large, say two or three. We confirmed also that the symmetric methods (explicit or implicit) would produce the stepsize-dependent instabilities/resonances, which was discovered by A. Toomre in 1991 and confirmed by G.D. Quinlan for some high order explicit methods. Although the implicit methods require twice or more computational time for the same stepsize than the explicit symmetric ones do, they seem to be preferable since they reduce these undesirable features significantly.

Sign in / Sign up

Export Citation Format

Share Document