Ferroelectrically Switchable Columnar Liquid Crystalline Ureas

Kishikawa, Keiki; Nakahara, Shoichiro; Nishikawa, Yumiko; Natsukawa, Masanori; Kohmoto, Shigeo

doi:10.1080/15421400802612052

Cited by 8 publications

(9 citation statements)

References 17 publications

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“…These systems tend to predominantly form smectic phases, again attributed to intermolecular hydrogen bonding between the amide groups. Indeed, the use of amide groups in structures such as benzene tricarboxamides (BTA) [19][20][21][22] , hydrazine derivatives [23][24][25][26][27][28] , or peptide residues [29][30][31] promotes columnar liquid crystal phases in which hydrogen bonding stabilises the columns.…”

Section: Page 1 Of 31mentioning

confidence: 99%

Understanding the remarkable difference in liquid crystal behaviour between secondary and tertiary amides: the synthesis and characterisation of new benzanilide-based liquid crystal dimers

Strachan

Harrison

Storey

et al. 2021

Phys. Chem. Chem. Phys.

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Section: Page 1 Of 31mentioning

confidence: 99%

Understanding the remarkable difference in liquid crystal behaviour between secondary and tertiary amides: the synthesis and characterisation of new benzanilide-based liquid crystal dimers

Strachan

Harrison

Storey

et al. 2021

Phys. Chem. Chem. Phys.

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“…First, these bent‐core, disc‐ and umbrella‐shaped molecules tend to self‐assemble into columnar hexagonal manner . It has been speculated that in this conformation the separate columns could be used as single memory bits which would allow fabrication of ultrahigh‐density memory devices . For more short‐term applications self‐assembly improves order in the system and thereby device characteristics.…”

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confidence: 99%

Tuning the Ferroelectric Properties of Trialkylbenzene‐1,3,5‐tricarboxamide (BTA)

Urbanavičiūtė

Meng

Cornelissen

et al. 2017

Adv Elect Materials

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This study demonstrates how simple structural modification of a prototypical organic ferroelectric molecule can be used to tune its key ferroelectric properties. In particular, it is found that shortening the alkyl chain length of trialkylbenzene-1,3,5-tricarboxamide (BTA) from C18H37 to C6H13 causes an increase in depolarization activation energy (approximate to 1.1-1.55 eV), coercive field (approximate to 25-40 V mu m(-1)), and remnant polarization (approximate to 20-70 mC m(-2)). As the polarization enhancement far exceeds the geometrically expected factor, these observations are attributed to an increase in the intercolumnar interaction. The combination of the mentioned characteristics results in a record polarization retention time of close to three months at room temperature for capacitor devices of the material having the shortest alkyl chain. The long retention and the remnant polarization that is as high as that of P(VDF:TrFE) distinguish the BTA-C6 material from other small molecular organic ferroelectrics and make it a perspective choice for applications that require cheap, flexible, and lightweight ferroelectrics.

Funding Agencies|NWO Nano program; Vetenskapsradet; Swedish Government Strategic Research Area in Materials Science on Functional Materials at the Linkping University (Faculty Grant SFO Mat LiU) [2009 00971]

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“…The AP-FCLC phase has the potential to realize writable, rewritable, and nonvolatile nano-sized memory devices if one-bit of information can be recorded by a nano-sized electrode. 2,4,31 However, it is still challenging to maintain the induced polarization after removal of the electric field, and we believe that polarization maintenance is most important to realize nonvolatile memory devices.…”

Section: ■ Introductionmentioning

confidence: 99%

Chiral Self-Sorting and the Realization of Ferroelectricity in the Columnar Liquid Crystal Phase of an Optically Inactive N,N′-Diphenylurea Derivative Possessing Six (±)-Citronellyl Groups

2021

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An axially polar-ferroelectric columnar liquid crystal (AP-FCLC) phase that exhibits both switching and maintenance of the macro-polarity in the column axis direction has been achieved in an N,N′-bis(3,4,5-trialkoxyphenyl)urea compound (rac-1) prepared from (±)-citronellyl bromide. Although it had been thought that chirality is necessary to achieve the AP-FCLC phase from our previous study, the optically inactive compound which is a mixture of 21 stereoisomers, generated an AP-FCLC phase. We confirmed its ferroelectricity and investigated the mechanism for realizing the AP-FCLC phase using optoelectronic experiments, Xray diffraction, and circular dichroism spectroscopy. As a result, it was suggested that chiral self-sorting occurs in the columnar liquid crystal phase, in which molecules with a similar stereochemistry form a one-handed helical column, and columns with the same helicity gather together to form a chiral domain. Accordingly, we conclude that the optically inactive compound rac-1 also indicates ferroelectricity similar to that of an optically pure urea compound because of chiral self-sorting.

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Ferroelectrically Switchable Columnar Liquid Crystalline Ureas

Cited by 8 publications

References 17 publications

Understanding the remarkable difference in liquid crystal behaviour between secondary and tertiary amides: the synthesis and characterisation of new benzanilide-based liquid crystal dimers

Understanding the remarkable difference in liquid crystal behaviour between secondary and tertiary amides: the synthesis and characterisation of new benzanilide-based liquid crystal dimers

Tuning the Ferroelectric Properties of Trialkylbenzene‐1,3,5‐tricarboxamide (BTA)

Chiral Self-Sorting and the Realization of Ferroelectricity in the Columnar Liquid Crystal Phase of an Optically Inactive N,N′-Diphenylurea Derivative Possessing Six (±)-Citronellyl Groups

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