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12 results on '"Lugger, Jody A. M."'

2. Suppressing depolarization by tail substitution in an organic supramolecular ferroelectric

Author

Urbanaviciute, Indre, Bhattacharjee, Subham, Biler, Michal, Lugger, Jody A. M., Cornelissen, Tim D., Norman, Patrick, Linares, Mathieu, Sijbesma, Rint P., Kemerink, Martijn, Urbanaviciute, Indre, Bhattacharjee, Subham, Biler, Michal, Lugger, Jody A. M., Cornelissen, Tim D., Norman, Patrick, Linares, Mathieu, Sijbesma, Rint P., and Kemerink, Martijn

Abstract

Despite being very well established in the field of electro-optics, ferroelectric liquid crystals so far lacked interest from a ferroelectric device perspective due to a typically high operating temperature, a modest remnant polarization and/or poor polarization retention. Here, we experimentally demonstrate how simple structural modification of a prototypical ferroelectric liquid-crystal benzene-1,3,5-trisamide (BTA) - introduction of branched-tail substituents - results in materials with a wide operating temperature range and a data retention time of more than 10 years in thin-film solution-processed capacitor devices at room temperature. The observed differences between linear- and branched-tail compounds are analyzed using density functional theory (DFT) and molecular dynamics (MD) simulations. We conclude that morphological factors like improved packing quality and reduced disorder, rather than electrostatic interactions or intra/inter-columnar steric hindrance, underlay the superior properties of the branched-tailed BTAs. Synergistic effects upon blending of compounds with branched and linear side-chains can be used to further improve the materials' characteristics., QC 20190325

Published
2019
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12. Tracking Local Mechanical Impact in Heterogeneous Polymers with Direct Optical Imaging.

Author

Filonenko GA, Lugger JAM, Liu C, van Heeswijk EPA, Hendrix MMRM, Weber M, Müller C, Hensen EJM, Sijbesma RP, and Pidko EA

Abstract

Structural heterogeneity defines the properties of many functional polymers and it is often crucial for their performance and ability to withstand mechanical impact. Such heterogeneity, however, poses a tremendous challenge for characterization of these materials and limits our ability to design them rationally. Herein we present a practical methodology capable of resolving the complex mechanical behavior and tracking mechanical impact in discrete phases of segmented polyurethane-a typical example of a structurally complex polymer. Using direct optical imaging of photoluminescence produced by a small-molecule organometallic mechano-responsive sensor we observe in real time how polymer phases dissipate energy, restructure, and breakdown upon mechanical impact. Owing to its simplicity and robustness, this method has potential in describing the evolution of complex soft-matter systems for which global characterization techniques fall short of providing molecular-level insight., (© 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.)

Published
2018
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