Effect of Imidazolium-Based Surface-Active Ionic Liquids on the Orientation of Liquid Crystals at Various Fluid/Liquid Crystal Interfaces

Langmuir ◽  
2016 ◽  
Vol 32 (45) ◽  
pp. 11745-11753 ◽  
Author(s):  
Tongtong Tian ◽  
Qiongzheng Hu ◽  
Yi Wang ◽  
Yan’an Gao ◽  
Li Yu
Keyword(s):  
Ionic Liquids ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Surface Active ◽  
Crystal Interfaces

scholarly journals Stable and Oriented Liquid Crystal Droplets Stabilized by Imidazolium Ionic Liquids

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 6044
Author(s):  
Efthymia Ramou ◽  
Guilherme Rebordão ◽  
Susana I. C. J. Palma ◽  
Ana C. A. Roque
Keyword(s):  
Ionic Liquids ◽  
Liquid Crystal ◽  
Soft Matter ◽  
Sodium Dodecyl ◽  
High Yield ◽  
Molecular Features ◽  
Surface Active ◽  
State Of Matter ◽  
First Time ◽  
Sds Surfactant

Liquid crystals represent a fascinating intermediate state of matter, with dynamic yet organized molecular features and untapped opportunities in sensing. Several works report the use of liquid crystal droplets formed by microfluidics and stabilized by surfactants such as sodium dodecyl sulfate (SDS). In this work, we explore, for the first time, the potential of surface-active ionic liquids of the imidazolium family as surfactants to generate in high yield, stable and oriented liquid crystal droplets. Our results show that [C12MIM][Cl], in particular, yields stable, uniform and monodisperse droplets (diameter 74 ± 6 µm; PDI = 8%) with the liquid crystal in a radial configuration, even when compared with the standard SDS surfactant. These findings reveal an additional application for ionic liquids in the field of soft matter.

scholarly journals 1-(4-Alkyloxybenzyl)-3-methyl-1H-imidazol-3-ium organic backbone: A versatile smectogenic moiety

2009 ◽  
Vol 5 ◽  
Author(s):  
William Dobbs ◽  
Laurent Douce ◽  
Benoît Heinrich
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Common Element ◽  
Crystal Fields ◽  
Single Compound ◽  
Imidazolium Ring ◽  
Mesomorphic Properties

The merger of ionic liquid and liquid crystal fields, obtained by using the imidazolium ring as a common element, has allowed us to tailor a new set of materials which associate specific functionalities. These functionalities are consequences of the original properties of the component, ionic liquids, liquid crystals and their association in a single compound. The study of this interesting association led us to elaborate environment-flexible cationic architectures from which mesomorphic properties emerge. Moreover, we have also explored the influence of different anions on the mesomorphic properties.

Effect of Surfactant Structure on the Orientation of Liquid Crystals at Aqueous−Liquid Crystal Interfaces†

Langmuir ◽  
2003 ◽  
Vol 19 (16) ◽  
pp. 6436-6442 ◽  
Author(s):  
Jeffrey M. Brake ◽  
Andrew D. Mezera ◽  
Nicholas L. Abbott
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Crystal Interfaces

scholarly journals Fatty Acid-Derived Ionic Liquid Lubricant. Protic Ionic Liquid Crystals as Protic Ionic Liquid Additives

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 710 ◽  
Author(s):  
María-Dolores Avilés ◽  
Ramón Pamies ◽  
José Sanes ◽  
Francisco-José Carrión ◽  
María-Dolores Bermúdez
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystal ◽  
Fatty Acid ◽  
Liquid Crystals ◽  
Water Evaporation ◽  
Protic Ionic Liquid ◽  
X Ray ◽  
Sliding Surfaces ◽  
Ionic Liquid Crystals

Fatty acids are natural products which have been studied as green lubricants. Ionic liquids are considered efficient friction reducing and wear preventing lubricants and lubricant additives. Fatty acid-derived ionic liquids have shown potential as neat lubricant and additives. Protic ionic liquid crystals (PILCs) are protic ionic liquids (PILs) where cations and anions form ordered mesophases that show liquid crystalline behavior. The adsorption of carboxylate units on sliding surfaces can enhance the lubricant performance. Ionic liquid crystal lubricants with longer alkyl chains can separate sliding surfaces more efficiently. However, they are usually solid at room temperature and, when used as additives in water, transitions to high friction coefficients and wear rates, with tribocorrosion processes occur when water evaporation takes place at the interface. In order to avoid these inconveniences, in the present work, a protic ammonium palmitate (DPA) ionic liquid crystal has been added in 1 wt.% proportion to a short chain citrate ionic liquid (DCi) with the same protic ammonium cation. A spin coated layer of (DCi + DPA) was deposited on AISI316L steel surface before the sliding test against sapphire ball. Synergy between DCi PIL and DPA PILC additive reduces friction coefficient and wear rate, without tribocorrosion processes, as shown by scanning electron microscopy (SEM)/energy dispersive X-ray microanalysis (EDX) and X-ray photoelectron spectroscopy (XPS) results.

scholarly journals Liquid Crystals: Liquid Crystal Interfaces Programmed with Enzyme-Responsive Polymers and Surfactants (Small 43/2015)

Small ◽  
2015 ◽  
Vol 11 (43) ◽  
pp. 5722-5722 ◽  
Author(s):  
C. Derek Ma ◽  
Lisa Adamiak ◽  
Daniel S. Miller ◽  
Xiaoguang Wang ◽  
Nathan C. Gianneschi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Responsive Polymers ◽  
Crystal Interfaces

scholarly journals On the Miscibility of Nematic Liquid Crystals with Ionic Liquids and Joint Reaction for High Helical Twisting Power Product(s)

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 157
Author(s):  
Maciej Czajkowski ◽  
Joanna Feder-Kubis ◽  
Bartłomiej Potaniec ◽  
Łukasz Duda ◽  
Joanna Cybińska
Keyword(s):  
Ionic Liquids ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Phase ◽  
Nematic Liquid Crystals ◽  
Organic Salt ◽  
Power Product ◽  
Twisted Nematic ◽  
Helical Twisting Power ◽  
Phase Phase

Mixtures of nematic liquid crystals (LCs) with chiral ionic liquids (CILs) may find application as active materials for electrically driven broadband mirrors. Five nematic liquid crystal hosts were mixed with twenty three ionic liquids, including chiral ones, and studied in terms of their miscibility within the nematic phase. Phase diagrams of the mixtures with CILs which exhibited twisted nematic phase were determined. Miscibility, at levels between 2 and 5 wt%, was found in six mixtures with cyanobiphenyl-based liquid crystal host—E7. On the other hand, the highest changes in the isotropization temperature was found in the mixtures with isothiocyanate-based liquid crystal host—1825. Occurrence of chemical reactions was found. A novel chiral binaphtyl-based organic salt [N11116][BNDP] was synthesized and, in reaction to the 1825 host, resulted in high helical twisting power product(s). Selectivity of the reaction with the isothiocyanate-based liquid crystal was found.

scholarly journals Mesoscopic simulations of temperature-dependent anchoring and wetting behavior at aqueous–liquid crystal interfaces in the presence of a rod–coil amphiphilic monolayer

RSC Advances ◽  
2018 ◽  
Vol 8 (73) ◽  
pp. 42060-42067 ◽  
Author(s):  
Zunmin Zhang ◽  
Hongxia Guo ◽  
Erik Nies
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
Temperature Dependent ◽  
Wetting Behavior ◽  
Thermotropic Liquid Crystals ◽  
Dynamics Simulations ◽  
Crystal Interfaces ◽  
Mesoscopic Simulations

Dissipative particle dynamics simulations have been applied to study the temperature dependent anchoring and wetting behavior of thermotropic liquid crystals (LCs) in the presence of a rod–coil amphiphilic monolayer at the aqueous–LC interface.

Influence of Surfactant Tail Branching and Organization on the Orientation of Liquid Crystals at Aqueous−Liquid Crystal Interfaces

Langmuir ◽  
2005 ◽  
Vol 21 (15) ◽  
pp. 6805-6814 ◽  
Author(s):  
Nathan A. Lockwood ◽  
Juan J. de Pablo ◽  
Nicholas L. Abbott
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Crystal Interfaces
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