Nematic-to-columnar mesophase transition by in situ supramolecular polymerization

Yano, Keiichi; Itoh, Yoshimitsu; Araoka, Fumito; Watanabe, Go; Hikima, Takaaki; Aida, Takuzo

doi:10.1126/science.aan1019

Cited by 81 publications

(66 citation statements)

References 56 publications

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“…MP has the lowest H:C and highest aromatic content with aligned aromatic sheets ( fig. S1) (15,16), while LvB (Department of Energy Coal Sample 19, as selected in this work) coal has the largest initial aromatic core, intermediate H:C ratio and aromatic content (17). Benefiting from the understanding of the materials properties from each feedstock in combination with the high-temperature, highly localized thermal treatment provided by the laser provides an opportunity to develop customized carbon materials and their scalable and additive deployment in electronics.…”

Section: Resultsmentioning

confidence: 99%

Laser-engineered heavy hydrocarbons: Old materials with new opportunities

et al. 2020

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Polycyclic heavy hydrocarbons (HHs) such as coal, tar, and pitch are a family of materials with extremely rich and complex chemistry, representing a massive opportunity for their use in a range of potential applications. The present work shows that optimal selection of initial HHs based on molecular constituents is essential in tuning the material for a particular and targeted electronic application. Combining the selection of feedstock chemistry (H:C and aromatic content) and controlling variable laser treatment parameters (laser power, speed, and focus) lead to full control over the H:C ratio, sp2 concentration, and degree of graphitic stacking order of the products. The broad intertunability of these factors results from a wide distribution of carbon material crystallinity from amorphous to highly graphitic and a broad distribution of electrical conductivity up to 103 S/m.

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Section: Resultsmentioning

confidence: 99%

Laser-engineered heavy hydrocarbons: Old materials with new opportunities

et al. 2020

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“…These ideas have recently been explored to arrive at out‐of‐equilibrium systems and illustrate another new aspect of supramolecular polymer science; an emerging field that is only at its beginning . Similarly, using supramolecular polymers to switch liquid‐crystals is just one of other new features where the dynamics of the system is used …”

Section: Comparison Between Macromolecular and Supramolecular Polymersmentioning

confidence: 99%

“…[95,96,97] Similarly, using supramolecular polymers to switch liquid-crystals is just one of other new features where the dynamics of the system is used. [98]…”

Section: Comparison Between Macromolecular and Supramolecular Polymersmentioning

confidence: 99%

Supramolecular Polymers – we've Come Full Circle

Aida

Meijer

2020

Israel Journal of Chemistry

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175

142

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Since the first polymers were discovered, scientists have debated their structures. Before Hermann Staudinger published the brilliant concept of macromolecules, polymer properties were generally believed to be based on the colloidal aggregation of small particles or molecules. From 1920 onwards, polymers and macromolecules are synonymous with each other; i. e. materials made by many covalent bonds connecting monomers in 2 or 3 dimensions. Although supramolecular interactions between macromolecular chains are evidently important, e. g. in nylons, it was unheard of to proposing polymeric materials based on the interaction of small molecules. Breakthroughs in supramolecular chemistry, however, showed that polymer materials can be made by small molecules using strong directional secondary interactions; the field of supramolecular polymers emerged. In a way, we have come full circle. In this essay we give a personal story about the birth of supramolecular polymers, with special emphasis on their structures, way of formation, and the dynamic nature of their bonding. The adaptivity of supramolecular polymers has become a major asset for novel applications, e. g. in the direction for the sustainable use of polymers, but also in biomedicine and electronics as well as self‐healing materials. The lessons learned in the past years include aspects that forecast a bright future for the use of supramolecular interactions in polymer materials in general and for supramolecular polymers in particular. In order to give full tribute to Staudinger in the year celebrating 100 years of macromolecules, we will show that many of the concepts of macromolecular polymers apply to supramolecular polymers, with only one important difference with fascinating consequences: the dynamic nature of the bonds that form polymer chains.

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“…Due to this responsive and dynamic nature, the exploitation of LCs covers a wide range of discipline fields and applications in line with the current technological and societal needs, such as flat panel displays, [ 3 ] adaptive lenses and filters, [ 4,5 ] energy, [ 6–8 ] photonics, [ 9,10 ] biomedicine, [ 11,12 ] and design and architecture. [ 13,14 ]…”

Section: Introductionmentioning

confidence: 99%

Seeing the Unseen: The Role of Liquid Crystals in Gas‐Sensing Technologies

Esteves

Ramou

Porteira

et al. 2020

Advanced Optical Materials

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Fast, real‐time detection of gases and volatile organic compounds (VOCs) is an emerging research field relevant to most aspects of modern society, from households to health facilities, industrial units, and military environments. Sensor features such as high sensitivity, selectivity, fast response, and low energy consumption are essential. Liquid crystal (LC)‐based sensors fulfill these requirements due to their chemical diversity, inherent self‐assembly potential, and reversible molecular order, resulting in tunable stimuli‐responsive soft materials. Sensing platforms utilizing thermotropic uniaxial systems—nematic and smectic—that exploit not only interfacial phenomena, but also changes in the LC bulk, are demonstrated. Special focus is given to the different interaction mechanisms and tuned selectivity toward gas and VOC analytes. Furthermore, the different experimental methods used to transduce the presence of chemical analytes into macroscopic signals are discussed and detailed examples are provided. Future perspectives and trends in the field, in particular the opportunities for LC‐based advanced materials in artificial olfaction, are also discussed.

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Nematic-to-columnar mesophase transition by in situ supramolecular polymerization

Cited by 81 publications

References 56 publications

Laser-engineered heavy hydrocarbons: Old materials with new opportunities

Laser-engineered heavy hydrocarbons: Old materials with new opportunities

Supramolecular Polymers – we've Come Full Circle

Seeing the Unseen: The Role of Liquid Crystals in Gas‐Sensing Technologies

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