Phase behaviour of 1-methyl-3-octylimidazolium bis[trifluoromethylsulfonyl]imide with thiophene and aliphatic hydrocarbons: The influence of n-alkane chain length

2008 ◽  
Vol 263 (2) ◽  
pp. 176-181 ◽  
Author(s):  
Luisa Alonso ◽  
Alberto Arce ◽  
María Francisco ◽  
Ana Soto
Keyword(s):  
Chain Length ◽  
Phase Behaviour ◽  
Aliphatic Hydrocarbons ◽  
Alkane Chain

Fluorescent lanthanide complexes of Schiff base ligands possessingN-aryl moiety: influence of chain length on crossover (calamitic to discotic) phase behaviour

2010 ◽  
Vol 37 (11) ◽  
pp. 1393-1410 ◽  
Author(s):  
Nandiraju V.S. Rao ◽  
Trirup D. Choudhury ◽  
Rahul Deb ◽  
Manoj K. Paul ◽  
Thatavarthi R. Rao ◽  
...  
Keyword(s):  
Schiff Base ◽  
Chain Length ◽  
Lanthanide Complexes ◽  
Phase Behaviour ◽  
Schiff Base Ligands

Influence of Cation Na/Ca Ratio on Adsorption in LTA 5A:  A Systematic Molecular Simulation Study of Alkane Chain Length

2006 ◽  
Vol 110 (47) ◽  
pp. 23968-23976 ◽  
Author(s):  
E. García-Pérez ◽  
D. Dubbeldam ◽  
T. L. M. Maesen ◽  
S. Calero
Keyword(s):  
Molecular Simulation ◽  
Chain Length ◽  
Simulation Study ◽  
Alkane Chain

Comparison between Molecular Structure Effects in Triplet Positronium Annihilation Rates and Radiolysis Free Ion Yields in Liquid Hydrocarbons

1972 ◽  
Vol 50 (16) ◽  
pp. 2697-2698 ◽  
Author(s):  
G. R. Freeman ◽  
J.-P. Dodelet
Keyword(s):  
Molecular Structure ◽  
Chain Length ◽  
Molecular Interaction ◽  
Half Life ◽  
Density Effect ◽  
Liquid Hydrocarbons ◽  
Positronium Annihilation ◽  
Free Ion ◽  
Alkane Chain ◽  
Ion Yields

Two seemingly unrelated phenomena in liquid hydrocarbons have similar trends in their dependences upon the molecular structure of the hydrocarbon. The phenomena are the annihilation half-life of triplet positronium and the radiolysis free ion yield. In n-alkanes the effect of increasing the molecular chain length, upon both phenomena, appears to be simply to increase the density of interacting sites. Branching the alkane chain decreases the strength of molecular interaction with both electrons and positronium, although the relative decrease is much greater for the former than for the latter. The effects of double bonds on the phenomena, after separating out the density effect, are different from each other.

scholarly journals Effect of Alkane Chain Length on Crystallization in Emulsions during Supercooling in Quiescent Systems and under Mechanical Stress

Processes ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 6 ◽  
Author(s):  
Serghei Abramov ◽  
Kinza Shah ◽  
Lydia Weißenstein ◽  
Heike Karbstein
Keyword(s):  
Mechanical Stress ◽  
Chain Length ◽  
Alkane Chain

scholarly journals Positron annihilation and electron densities in organic liquids

1974 ◽  
Vol 27 (5) ◽  
pp. 1125 ◽  
Author(s):  
BJ Brown
Keyword(s):  
Positron Annihilation ◽  
Electron Density ◽  
Chain Length ◽  
Atomic Number ◽  
Aliphatic Hydrocarbons ◽  
Organic Liquids ◽  
Electron Densities ◽  
Effective Electron ◽  
Molecular Electron ◽  
Aromatic Systems

The effective electron density for positron annihilation in substituted aliphatic and aromatic liquid compounds has been determined. For the aliphatic hydrocarbons the molecular electron density Ne increases linearly with an increase in chain length and is equal to the sum of the partial electron densities of the substituent methyl (Ne(CH3) = 1.18) and methylene (Ne(CH2) = 1.28) groups.The values are approximately 10% lower for aromatic systems. The partial electron densities of substituted halogen atoms increase with atomic number and are: fluorine (9.3), chlorine (10.0), bromine (14.4) and iodine (23.0). For the aliphatic alcohols the partial Ne(OH) value decreases from 1.35 in methanol to 0.86 in octanol.

scholarly journals Effect of Alkane Chain Length on Crystallization in Emulsions during Supercooling in Quiescent Systems and under Mechanical Stress

2017 ◽  
Author(s):  
Serghei Abramov ◽  
Kinza Shah ◽  
Lydia Weißenstein ◽  
Heike Petra Karbstein
Keyword(s):  
Mechanical Stress ◽  
Chain Length ◽  
Crystallization Behavior ◽  
Droplet Diameter ◽  
Alkane Chain

Crystallization behavior of hexadecane (C16H34), octadecane (C18H38), eicosane (C20H42), and docosane (C22H46) dispersions of similar mean droplet diameter (x50.2 ≈ 15 µm) was investigated in quiescent systems and compared to crystallization under mechanical stress. In quiescent systems, the required supercooling decreased with increasing chain length of the alkanes to initiate crystallization. Crystallization of alkane dispersions under mechanical stress resulted in similar onset crystallization supercooling, as during quiescent crystallization. Increase of mechanical stress did not affect the onset crystallization supercooling within alkane dispersions.

scholarly journals Polyimide/Ionic Liquid Composite Membranes for Middle and High Temperature Fuel Cell Application: Water Sorption Behavior and Proton Conductivity

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 82 ◽  
Author(s):  
Kateryna Fatyeyeva ◽  
Sergiy Rogalsky ◽  
Stanislav Makhno ◽  
Oksana Tarasyuk ◽  
Jorge Soto Puente ◽  
...  
Keyword(s):  
Chain Length ◽  
Proton Conductivity ◽  
Elevated Temperatures ◽  
Alkyl Chain ◽  
Composite Membranes ◽  
Alkyl Chain Length ◽  
Proton Exchange ◽  
Phase Behaviour ◽  
Porous Polymer ◽  
Sorption Behavior

Four water insoluble room-temperature protic ionic liquids (PILs) based on the N-alkylimidazolium cation with the alkyl chain length from 1 to 4 and bis(trifluoromethylsulfonyl)imide anion were synthesized and their chemical structure was confirmed by the 1H NMR and 19F NMR analysis. PILs were revealed to be thermally stable up to 360 and 400 °C. At the same time, the proton conductivity of PILs was found to be dependent mostly on the temperature and, to a less extent, on the type of the cation, i.e., the increase of the conductivity from ~3 × 10−4 S/cm at 25 °C to 2 × 10−2 S/cm at 150 °C was observed. The water vapour sorption capacity of PILs was evaluated as a function of relative humidity and the influence of the alkyl chain length on the phase behaviour in the PIL-water system was discussed. The composite polyimide/PILs membranes were prepared by the PIL immobilization in the porous polymer (Matrimid® 5218) film. The composite membranes showed a high level of proton conductivity (~10−3 S/cm) at elevated temperatures (up to 160 °C). The obtained results reveal that the elaborated composite polyimide/PIL membranes are promising candidates for the application as proton exchange membrane at middle and high temperatures.

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