Comparing two tetraalkylammonium ionic liquids. II. Phase transitions

2016 ◽  
Vol 144 (22) ◽  
pp. 224505 ◽  
Author(s):  
Thamires A. Lima ◽  
Vitor H. Paschoal ◽  
Luiz F. O. Faria ◽  
Mauro C. C. Ribeiro ◽  
Fabio F. Ferreira ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Phase Transitions

scholarly journals Combinatorial discovery of small-molecule 1,2,3-triazolium ionic liquids exhibiting lower critical solution temperature phase transition

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Yen-Ho Chu ◽  
Mou-Fu Cheng ◽  
Yung-Hsin Chiang
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Phase Transitions ◽  
Small Molecule ◽  
Room Temperature ◽  
Solution Temperature ◽  
Temperature Phase ◽  
Critical Solution Temperature ◽  
True Value

Abstract Both lower and upper critical solution temperature (LCST and UCST) systems are two typical phase behaviors of thermoresponsive materials with solvents, in which LCST is far less common than UCST. Recent studies on ionic liquids carrying LCST phase transitions have predominantly focused on quaternary ammonium- and phosphonium-based ionic salts. Based on the 1,2,3-triazole core structure assemblable by azide-alkyne cycloaddition click reaction, this work reports the combinatorial synthesis of 1,3,4-trialkylated 1,2,3-triazolium ionic liquids in three libraries with a total of 160 ionic liquids and demonstrates, for the first time, their values in temperature-switchable phase transition with water. In this work, the successful discovery of a new thermoresponsive ionic liquid b26, based on the structure-and-phase separation study of b8 and b9, perfectly exemplified the true value of the tunability of ionic liquid fine structures. For all 160 ionic liquids synthesized, 155 are liquid at room temperature and 22 room-temperature ionic liquids were found to exhibit thermoresponsive phase transitions having low Tc values in water. To the best of our knowledge, this comprehensive study is the first report of small-molecule 1,2,3-triazolium ionic liquids that exhibit LCST property in water.

Phase transitions in higher-melting imidazolium-based ionic liquids: Experiments and advanced data analysis

2019 ◽  
Vol 292 ◽  
pp. 111222 ◽  
Author(s):  
Maja Čanji ◽  
Magdalena Bendová ◽  
Milen G. Bogdanov ◽  
Zdeněk Wagner ◽  
Nikola Zdolšek ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Phase Transitions ◽  
Data Analysis

Interfacial phase transitions in imidazolium-based ionic liquids

2005 ◽  
Vol 17 (45) ◽  
pp. S3325-S3331 ◽  
Author(s):  
V Halka ◽  
R Tsekov ◽  
W Freyland
Keyword(s):  
Ionic Liquids ◽  
Phase Transitions ◽  
Interfacial Phase

scholarly journals Brillouin Light Scattering Study of Microscopic Structure and Dynamics in Pyrrolidinium Based Ionic Liquids

2020 ◽  
Author(s):  
Supti Das ◽  
Dhanya Radhakrishnan ◽  
Venkata. S. Bhadram ◽  
Chandrabhas Narayana ◽  
Aninda J. Bhattacharyya
Keyword(s):  
Ionic Liquids ◽  
Phase Transitions ◽  
Light Scattering ◽  
Solid Phase ◽  
Microscopic Structure ◽  
Temperature Dependent ◽  
Brillouin Light Scattering ◽  
Acoustic Modes ◽  
Structure And Dynamics ◽  
Acoustic Velocities

<p>Pyrrolidinium based ionic liquids are known to be good ionic conductors even in solid-state around room temperature, which is attributed to the highly disordered plastic crystalline phase. Moreover, these ionic liquids are characterized by multiple phase transitions which include plastic, structural glass, and glassy crystal phases with varying levels of molecular disorder. Temperature-dependent Brillouin light scattering is used to investigate the phase transitions in a series of alkylmethylpyrrolidinium Bis(trifluoromethanesulfonyl) imides (P<i><sub>1n</sub></i>TFSI, n=1,2,4). Brillouin spectral features such as the number of acoustic modes, their shape, and linewidth provide the picture of different disordered phases resultant of dynamics at the microscopic scale. The longitudinal and transverse acoustic velocities in different phases are determined from the corresponding acoustic mode frequencies (Brillouin shift). Extremely low acoustic velocities in the solid phase of P<i><sub>11</sub></i>TFSI and P<i><sub>12</sub></i>TFSI are a consequence of a high degree of disorder and plasticity present in the system. Anomalous temperature-dependent behavior of linewidth and asymmetric (Fano) line shape of acoustic modes observed in certain phases of P<i><sub>1n</sub></i>TFSI could be due to the strong coupling between the Brillouin central peak and the acoustic phonons. The present results establish that the Brillouin light scattering technique can be efficiently used to understand the complex phase behavior, microscopic structure, and dynamics of ionic liquids.</p>

Phase Transitions of Triflate-Based Ionic Liquids under High Pressure

2015 ◽  
Vol 119 (44) ◽  
pp. 14315-14322 ◽  
Author(s):  
Luiz F. O. Faria ◽  
Mauro C. C. Ribeiro
Keyword(s):  
High Pressure ◽  
Ionic Liquids ◽  
Phase Transitions
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