scholarly journals Cold Crystallization and the Molecular Structure of Imidazolium-Based Ionic Liquid Crystals with a p-Nitroazobenzene Moiety

ACS Omega ◽  
2021 ◽  
Author(s):  
Katsuma Ishino ◽  
Hajime Shingai ◽  
Yasuyuki Hikita ◽  
Isao Yoshikawa ◽  
Hirohiko Houjou ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Ionic Liquid ◽  
Liquid Crystals ◽  
Cold Crystallization ◽  
Ionic Liquid Crystals

scholarly journals Ionic Liquid Crystals in Tribology

Lubricants ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 72 ◽  
Author(s):  
M.D. Avilés ◽  
C. Sánchez ◽  
R. Pamies ◽  
J. Sanes ◽  
M.D. Bermúdez
Keyword(s):  
Molecular Structure ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystals ◽  
Tribological Performance ◽  
Wear Rates ◽  
Fatty Acid Derivatives ◽  
Potential Applications ◽  
Ionic Liquid Crystals ◽  
Definition Of

The present work intends to provide a brief account of the most recent advances in the use of ionic liquid crystals (ILCs) in the field of tribology, that is, the development of new lubricants with the ability to reduce the coefficients of friction and the wear rates of materials under sliding conditions. After a definition of ILCs and their relationship with neutral liquid crystals (LCs) and ionic liquids (ILs), the review will be focused on the influence of molecular structure and composition on the tribological performance, the combination with base oils, surfactants or water, and the different sliding configuration and potential applications. The main mechanisms proposed in order to justify the lubricating ability of ILCs will be analyzed. Special emphasis will be made for recent results obtained for fatty acid derivatives due to their renewable and environmentally friendly nature.

scholarly journals Ion conformation and orientational order in a dicationic ionic liquid crystal studied by solid-state nuclear magnetic resonance spectroscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Debashis Majhi ◽  
Sergey V. Dvinskikh
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystals ◽  
Bond Order ◽  
Van Der Waals ◽  
Orientational Order ◽  
Smectic Phase ◽  
Side Chains ◽  
Dicationic Ionic Liquid ◽  
Ionic Liquid Crystals

AbstractIonic liquids crystals belong to a special class of ionic liquids that exhibit thermotropic liquid-crystalline behavior. Recently, dicationic ionic liquid crystals have been reported with a cation containing two single-charged ions covalently linked by a spacer. In ionic liquid crystals, electrostatic and hydrogen bonding interactions in ionic sublayer and van der Waals interaction in hydrophobic domains are the main forces contributing to the mesophase stabilization and determining the molecular orientational order and conformation. How these properties in dicationic materials are compared to those in conventional monocationic analogs? We address this question using a combination of advanced NMR methods and DFT analysis. Dicationic salt 3,3′-(1,6-hexanediyl)bis(1-dodecylimidazolium)dibromide was studied. Local bond order parameters of flexible alkyl side chains, linker chain, and alignment of rigid polar groups were analyzed. The dynamic spacer effectively “decouples” the motion of two ionic moieties. Hence, local order and alignment in dicationic mesophase were similar to those in analogous single-chain monocationic salts. Bond order parameters in the side chains in the dicationic smectic phase were found consistently lower compared to double-chain monocationic analogs, suggesting decreasing contribution of van der Waals forces. Overall dication reorientation in the smectic phase was characterized by low values of orientational order parameter S. With increased interaction energy in the polar domain the layered structure is stabilized despite less ordered dications. The results emphasized the trends in the orientational order in ionic liquid crystals and contributed to a better understanding of interparticle interactions driving smectic assembly in this and analogous ionic mesogens.

Molecular dynamics and electrical conductivity of Guanidinium based ionic liquid crystals: Influence of cation headgroup configuration

2021 ◽  
Vol 330 ◽  
pp. 115666
Author(s):  
Mohamed A. Kolmangadi ◽  
Arda Yildirim ◽  
Kathrin Sentker ◽  
Martin Butschies ◽  
Andrea Bühlmeyer ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Electrical Conductivity ◽  
Ionic Liquid ◽  
Liquid Crystals ◽  
Ionic Liquid Crystals

Liquid-crystalline behaviour and electrorheological effect of phthalocyanine-based ionic liquid crystals

2020 ◽  
pp. 1-10
Author(s):  
Aikebaier Reheman ◽  
Shuangying Hu ◽  
Lianjun Cao ◽  
Danhua Xie ◽  
Guiyang Yan ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Electrorheological Effect ◽  
Ionic Liquid Crystals

Intramolecular Diels Alder reactions in highly organized imidazolium salt-based ionic liquid crystals

RSC Advances ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 635-639 ◽  
Author(s):  
Tien Dat Do ◽  
Andreea R. Schmitzer
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Diels Alder ◽  
Imidazolium Salts ◽  
Imidazolium Salt ◽  
New Family ◽  
Ionic Liquid Crystals

This paper describes the development of a new family of ionic liquid crystals based on imidazolium salts and their applications as media for intramolecular Diels Alder reactions.

A study of dendritic ionic liquid crystals: Using (S)-4-citronellyloxybenzoic acid and polypropylene imine dendrimers

2016 ◽  
Vol 216 ◽  
pp. 209-215 ◽  
Author(s):  
Harun Nezih Türkçü ◽  
Hale Ocak ◽  
Mustafa U. Gürbüz ◽  
Fatih Çakar ◽  
Belkiz Bilgin-Eran ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Ionic Liquid Crystals

Effect of counter ions on the mesogenic ionic N-phenylpyridiniums

CrystEngComm ◽  
2018 ◽  
Vol 20 (18) ◽  
pp. 2593-2607 ◽  
Author(s):  
Ren-Tzong Wang ◽  
Gene-Hsiang Lee ◽  
Chung K. Lai
Keyword(s):  
Ionic Liquid ◽  
Liquid Crystals ◽  
Counter Ions ◽  
Ionic Liquid Crystals ◽  
Mesomorphic Properties

Two series of ionic liquid crystals (ILCs) derived from N-phenylpyridinium 1–2 were prepared and their mesomorphic properties were investigated.

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