Transient periodic dissipative structures in nematics confined between coaxial cylinders

Kini, U.D.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2095

Full metadata record

DC Field	Value	Language
dc.contributor.author	Kini, U.D.	-
dc.date.accessioned	2007-02-08T07:02:09Z	-
dc.date.available	2007-02-08T07:02:09Z	-
dc.date.issued	1999	-
dc.identifier.citation	Molecular Crystals and Liquid Crystals, 1999, Vol.333, p79-122	en
dc.identifier.issn	1058-725X	-
dc.identifier.uri	http://hdl.handle.net/2289/2095	-
dc.description	Restricted Access	en
dc.description.abstract	The onset of transient periodic dissipative structures (TPDS) is studied using the linear perturbation approximation when a sufficiently strong magnetic field (B) is impressed on the uniformly aligned director (no) of a nematic confined to the annular space between two coaxial cylinders of radii R2 and RI (Rz > RI). Only TPDS with axial or azimuthal periodicity is considered. An approximate expression for the magnetic body force density is employed. The solutions mainly concern rigid anchoring. When no is along the common axis, a radial field or an azimuthal field causes TPDS with periodicity along the axis when the calamitic nematic has positive diamagnetic anisotropy (χA >O); an axial field has a similar effect when χA < 0. The dependence of the rise time as well as the periodicity wavevector are studied as functions of the applied field strength and the ratio of the radii (R2, = R2/RI). A weakening of director anchoring has a deleterious effect on the formation of TPDS. When no is azi- muthal and χA > 0, a radial or an axial field may induce TPDS having an azimuthal periodicity wavevector which is an integer and related to the number of domains; continuous changes in control variables cause discontinuous changes in the wavevector. Using hypothetical material parameters, it is shown that an axial (or an azimuthal) field may induce TPDS with a continuously varying (or discontinuously varying) wavevector in a radially aligned discotic nematic having χA > 0. If χA < 0, a radial field may induce TPDS with modulation along both the axial and the azimuthal directions in a discotic nematic. When R21 is close to unity, the results of this work go over to those obtained for a flat sample.	en
dc.format.extent	1509467 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Gorden and Breach Science Publishers.	en
dc.rights	1999 Overseas Publishers Association N.V.	en
dc.subject	Anchoring energy	en
dc.subject	Freedericksz transition	en
dc.subject	Instabilities	en
dc.subject	Maxwell stress	en
dc.subject	Periodic deformations	en
dc.subject	Scaling laws	en
dc.subject	Transient phenomena	en
dc.title	Transient periodic dissipative structures in nematics confined between coaxial cylinders	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

Files in This Item:

File	Description	Size	Format
1999.MCLC V333 p79.pdf Restricted Access	Restricted Access	1.47 MB	Adobe PDF	View/Open Request a copy

Show simple item record