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Deciphering helix assembly in the heliconical nematic phase via tender resonant X-ray scattering

Cao, Yu; Feng, Jun; Nallapaneni, Asritha; Arakawa, Yuki; Zhao, Keqing; Zhang, Huijun; Mehl, Georg H.; Zhu, Chenhui; Liu, Feng


Yu Cao

Jun Feng

Asritha Nallapaneni

Yuki Arakawa

Keqing Zhao

Huijun Zhang

Chenhui Zhu

Feng Liu


Being a link between a uniaxial nematic and a chiral nematic, the twist bend nematic (NTB) has been an intriguing topic for research over the last decade as a key to understanding chirality generation. Accurate description and understanding of resonance effects in helical structures provide crucial knowledge on the phase behavior beyond positional ordering. We examined the manifestation of resonance effects in NTBviatender resonant X-ray scattering (TReXS) at the sulfur K-edge. For the first time we demonstrate quantitatively that the energy dependence of the scattering peak in the NTBphase follows the energy dependence of the complex refractive indices measured by X-ray absorption. Taking advantage of molecular energy calculation, we decipher the distinct helical pitch variation trend for symmetric/asymmetric dimers from the perspective of hybridization and reveal the strong effect of substituting oxygen for sulfur atoms on the helical pitch and the thermal helix extension.


Cao, Y., Feng, J., Nallapaneni, A., Arakawa, Y., Zhao, K., Zhang, H., …Liu, F. (2021). Deciphering helix assembly in the heliconical nematic phase via tender resonant X-ray scattering. Journal of Materials Chemistry C, 9(31), 10020-10028.

Journal Article Type Article
Acceptance Date Jun 30, 2021
Online Publication Date Jul 1, 2021
Publication Date Aug 21, 2021
Deposit Date Jul 28, 2021
Publicly Available Date Oct 27, 2022
Journal Journal of Materials Chemistry C
Print ISSN 2050-7526
Electronic ISSN 2050-7534
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 9
Issue 31
Pages 10020-10028
Keywords Materials Chemistry; General Chemistry
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