| Journal: | Brazilian journal of physics |
| Database: | PERIÓDICA |
| System number: | 000390688 |
| ISSN: | 0103-9733 |
| Authors: | Simonario, P.S1 Andrade, T.M. de1 Freire, F.C.M1 |
| Institutions: | 1Universidade Estadual de Maringa, Departamento de Fısica, Maringa, Parana. Brasil |
| Year: | 2016 |
| Season: | Feb |
| Volumen: | 46 |
| Number: | 1 |
| Pages: | 26-34 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | The pseudo-molecular method is employed to obtain analytical expressions for the elastic constants of an ensemble of anisotropic particles, in both disc-like and rodlike geometries. These particles interact via a phenomenological pair potential constructed from the non-spherical correction to the dispersion forces between two identical molecules. The molecular shape appears in the calculations of the elastic constants in two different cases. The first case considers a molecular volume of ellipsoidal shape continuously deformed from a positive (prolate spheroid, rodlike molecule) to large negative (oblate spheroid, disc-like molecule) values of a parameter describing some kind of eccentricity. The second one considers a molecular volume shape continuously deformed from a cylinder (calamitic molecule) to a plane disc by changing the ratio between the diameter of the cylinder and its long axis. The particular cases of Maier-Saupe and Nehring-Saupe interactions are obtained as simple limiting cases of the general pair potential interaction. These general results may be helpful to understand the limits of the pseudo-molecular method, and to understand the origin of elastic constants in discotic liquid crystals from a molecular perspective |
| Disciplines: | Física y astronomía |
| Keyword: | Física de materia condensada, Cristales líquidos, Constantes elásticas, Método pseudomolecular, Modelos de red |
| Keyword: | Physics and astronomy, Condensed matter physics, Liquid crystals, Elastic constants, Pseudo-molecular method, Lattice models |
| Full text: | Texto completo (Ver PDF) |
