OPOMNIK: IJS KOLOKVIJ, četrtek, 27. 6. 2019, ob 13.00 uri, prof. dr. Shu Yang

[natasa.gosevac at ijs.si]

Vabimo vas na 20. predavanje iz sklopa "Kolokviji na IJS" v letu 2018/19, ki bo v četrtek, 27. junija 2019, ob 13 uri. Predavanje bo izjemoma v Kolarjevi predavalnici Instituta »Jožef Stefan«  na Jamovi cesti 39 v Ljubljani. 

Napovednik predavanja najdete tudi na naslovu http://www.ijs.si/ijsw/Koledar_prireditev, posnetke preteklih predavanj pa na http://videolectures.net/kolokviji_ijs. 

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prof. dr. Shu Yang

University of Pennsylvania, Philadelphia, ZDA

 

Geometrija, topologija in tekoči kristali: Uporaba v materialih

 

“Geometrija je najbrž najbolj temeljna veda.” Geometrija se ukvarja z lastnostmi konfiguracij točk, črt in krožnic, topologija pa s prostorom, razsežnostmi in transformacijami. Govorili bomo o našem odkrivanju lepote in moči geometrije ter o uporabi v vrsti materialov na najrazličnejših skalah. Z načrtovanjem geometrijskih površinskih vzorcev – tu polja mikrostebričkov – znamo programirati topološke defekte ter s tem orientacijsko elastičnost v tekočekristalnih sistemih. Če sklopimo primeren kemijski vzorec s površinsko topografijo, lahko dosežemo zlom simetrije, ki omogoča multistabilni optični preklop. Geometrija je neodvisna od materialov. S poznavanjem tekočih kristalov iz majhnih molekul lahko v 2D tekočekristalni elastomer programiramo poljubne 3D oblike. S sklapljanjem s šibkimi silami nam je uspelo v navpični smeri poravnati do 200 m velike atomsko tanke 2D nanoplasti titanovega karbida iz družine MXenov ter s tem povečati kapaciteto za shranjevanje energije. Geometrija je tudi invariantna na skalo. Naposled bomo omenili možnost uporabe geometrije za izdelavo pametnih tkanin.  

Predavanje bo v angleščini.

Lepo vabljeni!

 

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We invite you to the 20th Institute colloquium in the academic year 2018/19. The colloquium will be held on Thursday, June 27, 2019 at 13 PM. On this occasion, the lecture will be held in the Kolar lecture hall, Jamova 39, Ljubljana. 

To read the abstract click   <http://www.ijs.si/ijsw/Koledar_prireditev> http://www.ijs.si/ijsw/Koledar_prireditev. Past colloquia are posted on   <http://videolectures.net/kolokviji_ijs> http://videolectures.net/kolokviji_ijs.

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prof. dr. Shu Yang

University of Pennsylvania, Philadelphia, ZDA

 

Geometry, topology, and liquid crystals: The materials applications

 

“Geometry is perhaps the most elementary of the sciences”. Geometry is concerned with the properties of configurations of points, lines, and circles, and topology is concerned with space, dimension, and transformation. We will discuss our journey of discovering the beauty and power of geometry, and applications in a wide variety of materials at all scales. Through designs of geometric surface patterns, here, micropost arrays, we program topological defects, and thus the orientational elasticity in liquid crystal assemblies. When coupling chemical patterning and surface topography, we demonstrate symmetry breaking, allowing for multi-state optical switching. Geometry is materials independent. Taking the knowledge in small molecule liquid crystals, we preprogram arbitrary 3D shapes in 2D sheets of liquid crystal elastomers. By coupling with soft forces, we vertically aligned atomically thin 2D nanosheets of titanium carbide from the MXene family up to 200 m to store more energy. Geometry is also scale invariant. Lastly, we will show the prospective of taking geometry to create smart fabrics.

 

Cordially invited!

 

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