Issue
EPL
Volume 79, Number 2, July 2007
Article Number 26004
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/79/26004
Published online 02 July 2007
EPL, 79 (2007) 26004
DOI: 10.1209/0295-5075/79/26004

Hydrodynamics and growth laws in lamellar ordering

M. Cencini1, 2, D. Diacono3 and G. Gonnella3, 4

1  INFM-CNR, SMC Dipartimento di Fisica Università Roma 1, P.zzle A. Moro 2, 00185 Roma, Italy
2  ISC-CNR, Via dei Taurini 19, 00185 Roma, Italy
3  Istituto Nazionale di Fisica Nucleare, Sezione di Bari - via Amendola 173, Bari, Italy
4  Dipartimento di Fisica, Università di Bari - via Amendola 173, 70126 Bari, Italy


received 5 April 2007; accepted in final form 4 June 2007; published July 2007
published online 2 July 2007

Abstract
Ordering of lamellar phases described by a free-energy functional with short-range interactions is numerically investigated in two dimensions by means of a pseudo-spectral method. The ordering process is found to depend on the fluid viscosity: it is arrested for large viscosity values and proceeds as a power law for small ones, with a crossover regime for intermediate values. At varying the free energy parameters, strong evidence has been found that the ordering law, unlike binary mixtures, is not unique.

PACS
64.75.+g - Solubility, segregation, and mixing; phase separation.
47.54.-r - Pattern selection; pattern formation.
82.35.Jk - Copolymers, phase transitions, structure.

© Europhysics Letters Association 2007