Abstract
Abstract A new approach for describing smectic structures is proposed based on neutron scattering experiments involving fast-cooled liquid crystals. As an example, a comprehensive study of the structure of the MBBA solid modifications (noncrystalline and crystalline phases) is demonstrated. Neutron diffraction measurements were carried out on four samples with different deuterium/hydrogen contents. By model fitting to the experimental data the structure of the crystalline phases could be characterized by a monoclinic lattice thereby enabling molecular packing model to be proposed. Information on the structure of the non-crystalline phases was gained from small angle neutrons scattering data. On the one hand smectic-type layers were observed, on the other hand the existence of the theoretically predicted anisotropic density domains was proved. These results together with the molecular pacing model generalized from the crystal phase structure led to classification of nematic, smectic A and tilt smectic-type solid mesophases. The medium range ordering and the local molecular packing are described for these phases. A procedure for modelling the molecular structure in liquid crystals is proposed based on scattering experiments using the intermediate fast-cooled state.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
