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Formation of smectic phases in binary liquid crystal mixtures with a huge length ratio

التفاصيل البيبلوغرافية
العنوان: Formation of smectic phases in binary liquid crystal mixtures with a huge length ratio
المؤلفون: Nadia Kapernaum, Friederike Knecht, C. Scott Hartley, Jeffrey C. Roberts, Robert P. Lemieux, Frank Giesselmann
المصدر: Beilstein Journal of Organic Chemistry, Vol 8, Iss 1, Pp 1118-1125 (2012)
بيانات النشر: Beilstein-Institut, 2012.
سنة النشر: 2012
المجموعة: LCC:Science
LCC:Organic chemistry
مصطلحات موضوعية: bidispersity, liquid crystals, phase diagrams, smectic phases, smectic F phase, structure and dynamics, Science, Organic chemistry, QD241-441
الوصف: A system of two liquid-crystalline phenylpyrimidines differing strongly in molecular length was studied. The phase diagram of these two chemically similar mesogens, with a length ratio of 2, was investigated, and detailed X-ray diffraction and electrooptical measurements were performed. The phase diagram revealed a destabilization of the nematic phase, which is present in the pure short compound, while the smectic state was stabilized. The short compound forms smectic A and smectic C phases, whereas the longer compound forms a broad smectic C phase and a narrow higher-ordered smectic phase. Nevertheless, in the mixtures, the smectic C phase is destabilized and disappears rapidly, whereas smectic A is the only stable phase observed over a broad concentration range. In addition, the smectic translational order parameters as well as the tilt angles of the mixtures are reduced. The higher-ordered smectic phase of the longer mesogen was identified as a smectic F phase.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1860-5397
Relation: https://doaj.org/toc/1860-5397
DOI: 10.3762/bjoc.8.124
URL الوصول: https://doaj.org/article/c838d67df5794227a489c00f8fca918e
رقم الأكسشن: edsdoj.838d67df5794227a489c00f8fca918e
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:18605397
DOI:10.3762/bjoc.8.124