ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarMáthé MarcellWigner RCP SZFIDefects induced by anchoring 
transitions of nematic fluids at solid and gas interfacesTuesday, 18 May 
2021, 10:00, Teams,  
https://teams.microsoft.com/l/meetup-join/19%3ace423c05cd1543ab9f9905886590ad69%40thread.tacv2/1620042537966?context=%7b%22Tid%22%3a%224d7ddeef-14ff-4911-8c11-401c69384d77%22%2c%22Oid%22%3a%22969d2d4a-5ba8-43f1-bd69-93f0998b025f%22%7dTemperature
 triggered anchoring transitions in nematic liquid crystals have been 
investigated at solid, as well as at air interfaces. We established a 
searching algorithm based on sessile droplets allowing an efficient discovery 
of compounds that show orientational transitions. We have identified two 
types of the transition, one on the coated substrate and another at the free 
surface bounded by air. As a consequence of the two types of anchoring 
transitions, we revealed two distinct textures involving topological defects 
in spherical caps of nematics governed by the reorganisation of the director 
field. In order to understand this surface induced restructuring of the 
director field, we performed optical simulations of the sessile droplets. 
Apart from the known discontinuous interfacial orientational transition we 
have also identified continuous director restructuring. Moreover we have also 
detected a double transition, involving a re-entrant behaviour. Minden 
érdeklődőt szívesen látunk! - Everyone is welcome to attend.Róbert 
Juhászsem-admin AT szfki.hu