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Published Online: 17 September 2013
Accepted: August 2013

Reassessment of structure of smectic phases: Nano-segregation in smectic E phase in 4-n-alkyl-4′-isothiocyanato-1,1′-biphenyls

J. Chem. Phys. 139, 114902 (2013); https://doi.org/10.1063/1.4821162
Kazuya Saito1, a), Takahito Miyazawa1, Akio Fujiwara1, Mafumi Hishida1, Hideki Saitoh2, Maria Massalska-Arodź3, and Yasuhisa Yamamura1
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ABSTRACT
Based on new diffraction data from aligned samples of smectic E (SmE) phase of 4-n-alkyl-4′-isothiocyanato-1,1′-biphenyls, systematics against the alkyl chain length n is analyzed. In order to perform the analysis, the molecular form factor approximated by a box-shaped distribution is calculated while taking the rounding of the distribution at corners into account. The analysis clearly shows the nano-segregated layered structure, which does not fit to the traditional structural view of SmE phase but does fit to the model the present authors proposed recently. Some implications of this conclusion are discussed in relation to the importance of the molten state of alkyl chains in most of real mesogens revealed previously through thermodynamic analyses.

ACKNOWLEDGMENTS

The authors are deeply indebted to Dr. W. Press for his comments and suggestion during a memorial conference “Neutron Spectroscopy and Related Phenomena – Tribute to Jerzy Janik” held on March 21 and 22, 2013 at Kraków, Poland. This work was supported in part by Grant-in-Aid for Scientific Research (B) 22350056 from Japan Society for the Promotion of Science (JSPS). Experiment at Photon Factory, High Energy Accelerator Research Organization (KEK), Japan was performed under the Project No. 2012G636.

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