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Supercooling of functional alkyl-π molecular liquids

Metastable states of soft matters are extensively used in designing stimuli-responsive materials. However, the non-steady properties may obstruct consistent performance. Here we report an approach to eradicate the indistinguishable metastable supercooled state of functional molecular liquids (FMLs),...

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Detalles Bibliográficos
Autores principales: Lu, Fengniu, Jang, Keumhee, Osica, Izabela, Hagiwara, Keita, Yoshizawa, Michito, Ishii, Masashi, Chino, Yoshiaki, Ohta, Kazuchika, Ludwichowska, Kinga, Kurzydłowski, Krzysztof Jan, Ishihara, Shinsuke, Nakanishi, Takashi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6166271/
https://www.ncbi.nlm.nih.gov/pubmed/30294417
http://dx.doi.org/10.1039/c8sc02723d
Descripción
Sumario:Metastable states of soft matters are extensively used in designing stimuli-responsive materials. However, the non-steady properties may obstruct consistent performance. Here we report an approach to eradicate the indistinguishable metastable supercooled state of functional molecular liquids (FMLs), which remains as a liquid for weeks or months before crystallizing, via rational molecular design. The phases (solid, kinetically stable liquid, and supercooled liquid) of a model FML, branched alkyl chain-substituted 9,10-diphenylanthracene (DPA), are found to be governed by subtle alterations of the molecular structure (alkyl-DPA ratio and bulkiness of the DPA unit). We thus outline molecular design principles to avoid supercooled FML formation. Moreover, we demonstrate a practical technique to rapidly discriminate supercooled FMLs (within 5 h) by accelerating their crystallization in differential scanning calorimetry heating via pre-annealing or relatively slow scanning.