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Study of Liquid Crystals Showing Two Isotropic Phases by H-1 NMR Diffusometry and H-1 NMR Relaxometry
Jozef Stefan Inst, Dept Solid State Phys, SI-1000 Ljubljana, Slovenia..
Univ Pisa, Dipartimento Chim & Chim Ind, I-56124 Pisa, Italy..
Univ Warsaw, Dept Chem, PL-02093 Warsaw, Poland..
Jozef Stefan Inst, Dept Solid State Phys, SI-1000 Ljubljana, Slovenia..
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2019 (Engelska)Ingår i: CRYSTALS, Vol. 9, nr 3, artikel-id 178Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this work, we report a study of two thermotropic liquid crystalline samples showing a not common mesophase behavior. The samples, namely a di-benzyloxy biphenyl derivative labelled 9/2 RS/RS, and a bimesogenic liquid crystal labelled L1, show a direct transition between two isotropic phases followed, at lower temperatures, by the optically isotropic, 3D structured, cubic phase. These systems have been investigated by means of H-1 NMR diffusometry and H-1 NMR relaxometry in order to characterize their isotropic-isotropic'-cubic mesophase behavior, mainly on the dynamic point of view. In particular, the temperature trend of the self-diffusion coefficients measured for both samples allowed us to significantly distinguish between the two isotropic phases, while the temperature dependence of the H-1 spin-lattice relaxation time (T-1) did not show significant discontinuities at the isotropic-isotropic' phase transition. A preliminary analysis of the frequency-dependence of H-1 T-1 at different temperatures gives information about the main motional processes active in the isotropic mesophases.

Ort, förlag, år, upplaga, sidor
MDPI , 2019. Vol. 9, nr 3, artikel-id 178
Nyckelord [en]
NMR, cubic phase, isotropic phase, self-diffusion, liquid crystals, relaxation time, dynamics, H-1 NMR
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URN: urn:nbn:se:kth:diva-251345DOI: 10.3390/cryst9030178ISI: 000464478100003Scopus ID: 2-s2.0-85064653109OAI: oai:DiVA.org:kth-251345DiVA, id: diva2:1317065
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QC 20190521

Tillgänglig från: 2019-05-21 Skapad: 2019-05-21 Senast uppdaterad: 2019-05-23Bibliografiskt granskad

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