Remarks on the flow alignment of disc like nematics
نویسنده
چکیده
2014 The nature of the flow alignment of nematic liquid crystals is discussed within the hydrodynamic theory of Leslie, Ericksen and Parodi. It is shown that there is a limited range of angles for which flow alignment can occur. With this as a starting point the flow alignment of disc like nematics is discussed. It is proved that only one out of the two models of flow alignment recently discussed in the literature [2-4] is consistent with the hydrodynamic theory of nematics. J. Physique 44 (1983) 909-911 AOÛT 1983, Classification Physics Abstracts 61. 30G
منابع مشابه
Regular and chaotic flow behavior and orientational dynamics of tumbling nematics
The flow behavior of (both low molecular weight and polymeric) liquid crystals is strongly affected by the coupling between the flow and the molecular orientation. Nematic liquid crystals which respond with a time-dependent orientational behavior to an applied steady shear flow rather than a stationary flow alignment are called ’tumbling nematics’. The time-dependent phenomena can be rather com...
متن کاملRemarks on Modern Track Geometry Maintenance
A short survey on modern track maintenance methods is given, concentrating on the developments in recent years. The ongoing refinement of the machinery should be shown as the influence of IT-solutions. On top the economic view to the track infrastructure is briefly demonstrated. Further developments in track hardware solutions must respect the obtained high level of track work mechanization. H...
متن کاملTopological structure dynamics revealing collective evolution in active nematics
Topological defects frequently emerge in active matter like bacterial colonies, cytoskeleton extracts on substrates, self-propelled granular or colloidal layers and so on, but their dynamical properties and the relations to large-scale organization and fluctuations in these active systems are seldom touched. Here we reveal, through a simple model for active nematics using self-driven hard ellip...
متن کاملOptimized Conditions for Catalytic Chemical Vapor Deposition of Vertically Aligned Carbon Nanotubes
Here, we have synthesized vertically aligned carbon nanotubes (VA-CNTs), using chemical vapor deposition (CVD) method. Cobalt and ethanol are used as the catalyst and the carbon source, respectively. The effects of ethanol flow rate, thickness of Co catalyst film, and growth time on the properties of the carbon nanotube growth are investigated. The results show that the flow rate of ethanol and...
متن کاملOrientational order of motile defects in active nematics.
The study of liquid crystals at equilibrium has led to fundamental insights into the nature of ordered materials, as well as to practical applications such as display technologies. Active nematics are a fundamentally different class of liquid crystals, driven away from equilibrium by the autonomous motion of their constituent rod-like particles. This internally generated activity powers the con...
متن کامل