Bending nematic liquid crystal membranes with phospholipids

Cumberland, Jenieve; Lopatkina, Tetiana; Murachver, Matthew; Popov, Piotr; Kenderesi, Viktor; Buka, Ágnes; Mann, Elizabeth K.; Jákli, Antal

doi:10.1039/c8sm01193a

Cited by 10 publications

(4 citation statements)

References 34 publications

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“…Revisiting the POM photograph with uncrossed polarizers in Figure , we note that the central parts of both the ring-forming and the dark droplets (the latter marked with a white arrow) have a different color than in their periphery, which can be associated with the bent profile revealed by AFM observations. It can be hypothesized that the bending occurs as a result of the packing of IL headgroups coupled with the smectic nature of 8CB, , facilitating altogether the ring formation of TFCDs.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Events on Cyanobiphenyl-Based Self-Assembled Droplets Triggered by Gas Analytes

Ramou

Palma

Roque

2022

ACS Appl. Mater. Interfaces

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Liquid crystals (LCs) are prime examples of dynamic supramolecular soft materials. Their autonomous self-assembly at the nanoscale level and the further nanoscale events that give rise to unique stimuli-responsive properties have been exploited for sensing purposes. One of the key features to employ LCs as sensing materials derives from the fine-tuning between stability and dynamics. This challenging task was addressed in this work by studying the effect of the alkyl chain length of cyanobiphenyl LCs on the molecular self-assembled compartments organized in the presence of ionic liquid molecules and gelatin. The resulting multicompartment nematic and smectic gels were further used as volatile organic compound chemical sensors. The LC structures undergo a dynamic sequence of phase transitions, depending on the nature of the LC component, yielding a variety of optical signals, which serve as optical fingerprints. In particular, the materials incorporating smectic compartments resulted in unexpected and rich optical textures that have not been reported previously. Their sensing capability was tested in an in-house-assembled electronic nose and further assessed via signal collection and machine-learning algorithms based on support vector machines, which classified 12 different gas analytes with high accuracy scores. Our work expands the knowledge on controlling LC self-assembly to yield fast and autonomous accurate chemical-sensing systems based on the combination of complex nanoscale sensing events with artificial intelligence tools.

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Section: Resultsmentioning

confidence: 99%

Nanoscale Events on Cyanobiphenyl-Based Self-Assembled Droplets Triggered by Gas Analytes

Ramou

Palma

Roque

2022

ACS Appl. Mater. Interfaces

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“…The CLC droplets underwent tistage reconfigurations, which initiated from the interface and propagated to the (Figure 1A). Since DLPC amphiphiles form vesicles above 100 nM [39], at the conc tions used in this study, they were assumed to interact with the CLC interface in th icle form, at which the hydrophobic tails and acyl chains interdigitated into the CLC ecules. The vesicles reoriented at the interface, and upon penetration of their acyl c between the CLC molecules, their zwitterionic head groups packed at the interface vious studies have reported the transition from bipolar to radial configuration in ne microdroplets in the presence of phospholipid amphiphiles.…”

Section: Dynamic Molecular Reconfiguration Of High-chirality Droplets...mentioning

confidence: 99%

Chiral Liquid Crystal Microdroplets for Sensing Phospholipid Amphiphiles

Martínez‐González

2022

Biosensors

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Designing simple, sensitive, fast, and inexpensive readout devices to detect biological molecules and biomarkers is crucial for early diagnosis and treatments. Here, we have studied the interaction of the chiral liquid crystal (CLC) and biomolecules at the liquid crystal (LC)-droplet interface. CLC droplets with high and low chirality were prepared using a microfluidic device. We explored the reconfiguration of the CLC molecules confined in droplets in the presence of 1,2-diauroyl-sn-glycero3-phosphatidylcholine (DLPC) phospholipid. Cross-polarized optical microscopy and spectrometry techniques were employed to monitor the effect of droplet size and DLPC concentration on the structural reorganization of the CLC molecules. Our results showed that in the presence of DLPC, the chiral LC droplets transition from planar to homeotropic ordering through a multistage molecular reorientation. However, this reconfiguration process in the low-chirality droplets happened three times faster than in high-chirality ones. Applying spectrometry and image analysis, we found that the change in the chiral droplets’ Bragg reflection can be correlated with the CLC–DLPC interactions.

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“…[92][93][94] Other amphipathic molecule such as aliphatic acids, phospholipids, and lipopolysaccharides can also play the similar role. [95][96][97] In addition, for saline solutions, the LC alignment at the interface can be decided by the solutes. [98] For example, solutes such as iodide, perchlorate, and thiocyanate have large ionic radius and weak hydration and therefore favor the perpendicular alignment.…”

Section: Alignmentsmentioning

confidence: 99%

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

2022

Advanced Photonics Research

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Liquid crystals (LCs) are nanophotonic materials which can interact with light in the molecular scale. While the LCs are widely used in various displays, last decade has witnessed emerging applications of the LCs for nondisplays. Based on the unique stimuli–responsive property and optical property, the applications of the LCs in the field of sensors are widely explored. In addition, ions are widely distributed in nature and bionts, playing critical roles in many physiological activities and ecological cycles. Appropriate amount of ions is beneficial to the human body, while the excess ions can cause irreversible damages. As a result, a variety of LC sensors are proposed to detect the ion concentration in both body fluids and water samples. This article reviews the design principles, applications, and existing problems of the LC ion sensors. The geometries, alignments, and optical signals of the sensors, which can guide the design of the devices, are first discussed. Afterward, two types of LC ion sensors aiming at detecting metal ions and nonmetallic ions, respectively, are illustrated. Finally, the current challenges and potential development directions of the LC ion sensors are introduced briefly.

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Bending nematic liquid crystal membranes with phospholipids

Cited by 10 publications

References 34 publications

Nanoscale Events on Cyanobiphenyl-Based Self-Assembled Droplets Triggered by Gas Analytes

Nanoscale Events on Cyanobiphenyl-Based Self-Assembled Droplets Triggered by Gas Analytes

Chiral Liquid Crystal Microdroplets for Sensing Phospholipid Amphiphiles

Design and Applications of Liquid Crystal Biophotonic Sensors for Ion Detection

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