Liquid Crystals: Facilitated Ion Transport in Smectic Ordered Ionic Liquid Crystals (Adv. Mater. 42/2016)

Lee, Jun Young; Han, Kee Sung; Lee, Je Seung; Lee, Albert S.; Park, Seo Kyung; Hong, Sung Yun; Lee, Jong-Chan; Mueller, Karl T.; Hong, Soon Man; Koo, Chong Min

doi:10.1002/adma.201670297

Cited by 4 publications

(6 citation statements)

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“…Second, strong interaction between amide group and calcium ion weakens electron density of the adjacent bonds and, thus, eases their breakage. The temperature and isoconversional activation energy of the thermal decomposition of Nylon 6 also have been found to drop markedly with introduction of palladium nanoparticles. Chrissafis et al have studied nanocomposites of poly(ε‐caprolactone) with montmorillonite (native and organically modified), fumed silica, and multi‐walled carbon nanotubes.…”

Section: Thermal and Thermo‐oxidative Degradationmentioning

confidence: 98%

Isoconversional Kinetics of Polymers: The Decade Past

Vyazovkin

2016

Macromol. Rapid Commun.

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This article surveys the decade of progress accomplished in the application of isoconversional methods to thermally stimulated processes in polymers. The processes of interest include: crystallization and melting of polymers, gelation of polymer solutions and gel melting, denaturation (unfolding) of proteins, glass transition, polymerization and crosslinking (curing), and thermal and thermo-oxidative degradation. Special attention is paid to the kinetics of polymeric nanomaterials. The article discusses basic principles for understanding the variations in the activation energy and emphasizes the possibility of using models for linking such variations to the parameters of individual kinetic steps. It is stressed that many kinetic effects are not linked to a change in the activation energy alone and may arise from changes in the preexponential factor and reaction model. Also noted is that some isoconversional methods are inapplicable to processes taking place on cooling and cannot be used to study such processes as the melt crystallization.

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Section: Thermal and Thermo‐oxidative Degradationmentioning

confidence: 98%

Isoconversional Kinetics of Polymers: The Decade Past

Vyazovkin

2016

Macromol. Rapid Commun.

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“…The intersection of the fields of ionic liquids and liquid crystals is a relatively new sector of materials science, but has garnered increased research in recent years [ 1 , 2 , 3 , 4 ], as ionic liquid crystals have begun to show promise as useful molecules in tunable conductive materials [ 5 , 6 ] or as greener solvents [ 7 , 8 ], for example. Liquid crystalline phases are of interest due to their innate mesostructure, arising from energetically- or entropically-driven alignment of molecules, or from phase separation arrested by molecular structure.…”

Section: Introductionmentioning

confidence: 99%

Charge Transport and Phase Behavior of Imidazolium-Based Ionic Liquid Crystals from Fully Atomistic Simulations

Quevillon

Whitmer

2018

Materials

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Ionic liquid crystals occupy an intriguing middle ground between room-temperature ionic liquids and mesostructured liquid crystals. Here, we examine a non-polarizable, fully atomistic model of the 1-alkyl-3-methylimidazolium nitrate family using molecular dynamics in the constant pressure–constant temperature ensemble. These materials exhibit a distinct “smectic” liquid phase, characterized by layers formed by the molecules, which separate the ionic and aliphatic moieties. In particular, we discuss the implications this layering may have for electrolyte applications.

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“…developed a tri‐spiral (tSAc) integrated acridine donor and connected it with the DOBNA based acceptors to design deep‐blue TADF emitters, OBOtSAc and tBuOBOtSAc (Figure 8). [77] Due to the reduced donor strength of acridine core, the strong D−A interactions between the tSAC and the DOBNA acceptors are reduced, resulted deep‐blue emission (>450 nm) with very narrow FWHM >50 nm compared to the MH , MP and PP (Figure 6). By virtue of the confirmational rigidity of tSAc, the OBOtSAc and tBuOBOtSAc witnessed superior PLQY of 97 % and 98 %, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, recently triarylboron‐have been widely using as acceptor to construct TADF emitters for OLEDs [13–16] . Till date, several triarylboron‐based acceptors have been developed for OLED applications as showed in Figure 2 [12–79] . Among the reported boron based acceptors, the fully fused oxygen bridged triarylboron, 5,9‐dioxa‐13b‐boranaphtho[3,2,1‐de]anthracene ( DOBNA) attracted significant attention because of its unique properties such as multi‐resonance feature, rigid molecular structure, narrowband emission, and excellent TADF characteristics (Figure 3).…”

Section: Introductionmentioning

confidence: 99%

Neoteric Advances in Oxygen Bridged Triaryl Boron‐based Delayed Fluorescent Materials for Organic Light Emitting Diodes

Naveen,

Konidena,

Keerthika

2023

The Chemical Record

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Since their first demonstration, thermally activated delayed fluorescence (TADF) materials have been emerged as the most promising emitters because of their promising applications in optoelectronics, typified by organic light‐emitting diodes (OLEDs). In which, the rigid oxygen bridged boron acceptor‐featured (DOBNA) emitters have gained tremendous impetus for OLEDs, which is ascribed to their excellent external quantum efficiency (EQE). However, these materials often displayed severe efficiency roll‐off and poor operational stability. Therefore, there needs to be a comprehensive understanding of the aspect of the molecular design and structure‐property relationship. To the best of our knowledge, there is no detailed review on the structure‐function outlook of DOBNA‐based emitters emphasizing the effect of the nature of donor units, their number density, and substitution pattern on the physicochemical properties, excited state dynamics and OLED performance were reported. To fill this gap, herein we presented the recent advancements in DOBNA‐based acceptor featured TADF materials by classifying them into several subgroups based on the molecular design i. e. donor‐acceptor (D−A), D−A‐D, A−D‐A, and multi‐resonant TADF (MR‐TADF) emitters. The detailed design concepts, along with their respective physicochemical and OLED performances were summarized. Finally, the prospective of this class of materials in forthcoming OLED displays is also discussed.

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Liquid Crystals: Facilitated Ion Transport in Smectic Ordered Ionic Liquid Crystals (Adv. Mater. 42/2016)

Cited by 4 publications

References 0 publications

Isoconversional Kinetics of Polymers: The Decade Past

Isoconversional Kinetics of Polymers: The Decade Past

Charge Transport and Phase Behavior of Imidazolium-Based Ionic Liquid Crystals from Fully Atomistic Simulations

Neoteric Advances in Oxygen Bridged Triaryl Boron‐based Delayed Fluorescent Materials for Organic Light Emitting Diodes

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