Structure and local order of lyotropic cholesteric calamitic phases: the effect of the chiral molecule (Conference Presentation)

Antônio M. Figueiredo Neto; Oscar R. Santos; Dennys Reis; Arnaldo G. Oliveira-Filho; Cristiano L. P. Oliveira

doi:10.1117/12.2632245

3 October 2022 Structure and local order of lyotropic cholesteric calamitic phases: the effect of the chiral molecule (Conference Presentation)

Antônio M. Figueiredo Neto, Oscar R. Santos, Dennys Reis, Arnaldo G. Oliveira-Filho, Cristiano L. P. Oliveira

Author Affiliations +

Proceedings Volume PC12207, Liquid Crystals XXVI; PC122070E (2022) https://doi.org/10.1117/12.2632245
Event: SPIE Organic Photonics + Electronics, 2022, San Diego, California, United States

Abstract

We investigate a lyotropic mixture presenting in the calamitic nematic phase (NC) and its corresponding calamitic cholesteric phase (ChC), where a small amount of the chiral agent (brucine sulfate) was added. Different experimental techniques (polarized optical microscopy and laser conoscopy) were used to characterize the phases. The main technique employed in the analysis of the structure and local ordering at nanoscale is the Small-Angle X-ray Scattering, where advanced modeling analysis were applied. The lyotropic nematic mixtures was composed of potassium laurate/potassium sulfate/dodecanol/water and the cholesteric phases were obtained from these mixtures, by adding the chiral molecule, brucine sulfate. From an advanced modeling analysis, we show that the micellar overall shape is not modified by the doping with brucine. However, the presence of the brucine between micelles in the ChC phase imposes a higher correlation between micelles along the direction of the pseudo-lamellar ordering. Finally, the order parameter 〈P_2 〉 was calculated and these values for the phases NC and ChC are 0.8133(6) and 0.747(2), respectively, indicating a slightly higher orientational ordering in the NC phase.

Conference Presentation

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Antônio M. Figueiredo Neto, Oscar R. Santos, Dennys Reis, Arnaldo G. Oliveira-Filho, and Cristiano L. P. Oliveira "Structure and local order of lyotropic cholesteric calamitic phases: the effect of the chiral molecule (Conference Presentation)", Proc. SPIE PC12207, Liquid Crystals XXVI, PC122070E (3 October 2022); https://doi.org/10.1117/12.2632245

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KEYWORDS

Molecules

Doping

Laser optics

Laser scattering

Optical microscopy

Potassium

Scattering

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