Sumários
Relationship between macroscopic and molecular values of tensorial quantities
12 março 2019, 15:00 • João Luís Maia Figueirinhas
Determination of the relationship between the macroscopic values of tensorial quantities and the corresponding molecular properties in a nematic. Determination of magnetic susceptibility, electrical permittivity and refractive indexes as a function of order parameters and their molecular properties. Superordering matrix. Determination of the nematic order parameter by nuclear magnetic resonance of hydrogen. Solution of an application problem.
Mesofases characteristic of discotic liquid crystals. Identification techniques for mesophases.
11 março 2019, 13:00 • João Luís Maia Figueirinhas
Structure of the discotic nematic mesophases ND and ND *. Structure of the columnar mesophases Dho, Dhd, Drd, Dob, d and Dt. Identification and characterization of mesophases by the most used experimental techniques; by X-ray diffraction, polarizing optical microscopy, differential calorimetry and scanning electron microscopy.
Smectic mesophases of chiral compounds
26 fevereiro 2019, 15:00 • João Luís Maia Figueirinhas
Mesofases ferroelectric, antiferroelectric and ferrielectric. The mesophases SC *, SF *, SI *, SCA, structure of the molecular layers and possibility of the existence of a permanent macroscopic polarization. Mesofases TGBA and TGBC, structure of the mesophases and relation with the penetration of the chirality in the structure of layers of the smectic mesophases.
Hexatic smectic mesophases and crystalline smectic mesophases
25 fevereiro 2019, 13:00 • João Luís Maia Figueirinhas
Structure of the hexastic mesophases, structure of layers with bond orientational order, mesophases SBh, SF and SI. Structure of the crystalline smectic mesophases SBcr, SE, SJ, SK, SG, SH, SM and SN.
The chiral nematic and the smectic mesophases of disordered layer
19 fevereiro 2019, 15:00 • João Luís Maia Figueirinhas
The nematic director field in the chiral nematic mesophase and its relation to the mesophase optical behavior. Smectic mesophases type A (SA) and C (SC), structure and smectic order parameter. Structure of the smectic mesophases type A and C, SA1, SA2, SAd, SÃ, SC1, SC2, SCd and SC ~.