Zobrazeno 1 - 10
of 144
pro vyhledávání: '"Pawel Pieranski"'
Autor:
Pedro E. S. Silva, Ricardo Chagas, Susete N. Fernandes, Pawel Pieranski, Robin L. B. Selinger, Maria Helena Godinho
Publikováno v:
Communications Materials, Vol 2, Iss 1, Pp 1-10 (2021)
Cellulose is a naturally occurring system of interest for its chiral macromolecular structure. Here, colourful structural patterns are observed in a cellulose-based lyotropic cholesteric system, attributed to conformational self-adjustment of the cel
Externí odkaz:
https://doaj.org/article/afe50f6bfe194310b2e354392e1f95d2
Autor:
Pawel Pieranski, Maria Helena Godinho
Publikováno v:
Frontiers in Physics, Vol 7 (2020)
Dowsons are ±2π point singularities of the unitary complex order parameter eiφ characterizing the so-called dowser texture in a thin nematic layer with homeotropic boundary conditions. Dowsons are therefore similar to disclinations in freely-stand
Externí odkaz:
https://doaj.org/article/c063acb4fd10453fb7cee60e1e37c8bd
Autor:
Pawel Pieranski, Maria Helena Godinho
Publikováno v:
Materials, Vol 13, Iss 20, p 4681 (2020)
Due to its low symmetry C2v, the dowser texture is characterised by a 2D unitary vector field or alternatively by a unitary complex field. For the same symmetry reasons, the dowser texture is sensitive, in first order, to perturbations such as thickn
Externí odkaz:
https://doaj.org/article/2e10fe98c84d47d29f574571653e238d
Autor:
Pawel Pieranski
Publikováno v:
Materials, Vol 7, Iss 5, Pp 3453-3469 (2014)
We explore the structures and properties of stable, free-standing films of lyotropic mesophases drawn on apertures of various shapes in an atmosphere of controlled humidity. New phenomena are uncovered and interpreted.
Externí odkaz:
https://doaj.org/article/2ff44b165b754d5d92b96c2063824e0a
Autor:
Pawel Pieranski, Maria Helena Godinho
Publikováno v:
Liquid Crystals
Autor:
Robin L. B. Selinger, Pedro Silva, Ricardo Chagas, Maria Helena Godinho, Pawel Pieranski, Susete N. Fernandes
Publikováno v:
Communications Materials, Vol 2, Iss 1, Pp 1-10 (2021)
Cellulose-based systems are useful for many applications. However, the issue of self-organization under non-equilibrium conditions, which is ubiquitous in living matter, has scarcely been addressed in cellulose-based materials. Here, we show that qua
Autor:
Pawel PIERANSKI, Maria Helena GODINHO
La Texture Furcelle (the dowser texture) doit son nom à sa ressemblance avec l’outil en bois des sourciers (dowser). Etant sensible aux champs vectoriels, elle est dotée de propriétés inédites : cunéitropisme, rhéotropisme et électrotropism
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bcc5ae9ebe9cb7b1d0bf40576a557018
https://doi.org/10.51926/iste.9040.ch4
https://doi.org/10.51926/iste.9040.ch4
Autor:
Pawel Pieranski
Publikováno v:
Comptes Rendus Physique. 20:756-769
The articles of Pierre-Gilles de Gennes on liquid crystals published between 1968 and 1972 in the Comptes rendus de l'Academie des sciences appear today as models of conciseness. On barely three pages, with a few words and equations, de Gennes was ab
Publikováno v:
American Journal of Physics
American Journal of Physics, American Association of Physics Teachers, 2021, 89 (6), pp.603-611. ⟨10.1119/10.0003350⟩
American Journal of Physics, 2021, 89 (6), pp.603-611. ⟨10.1119/10.0003350⟩
American Journal of Physics, American Association of Physics Teachers, 2021, 89 (6), pp.603-611. ⟨10.1119/10.0003350⟩
American Journal of Physics, 2021, 89 (6), pp.603-611. ⟨10.1119/10.0003350⟩
International audience; The operational principle of twisted nematic displays involves the dielectric anisotropy of nematics. This crucial property was discovered about a hundred years ago by Jezewski and Kast who used a so- called resonance method i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dac1017b3dd2ae6ac5ad235d720a1013
https://hal.archives-ouvertes.fr/hal-03234467/file/Pieranski_doi_10.1119_10.0003350.pdf
https://hal.archives-ouvertes.fr/hal-03234467/file/Pieranski_doi_10.1119_10.0003350.pdf
Publikováno v:
The European Physical Journal Special Topics. 227:2439-2454
Disclination loops threaded on a polymeric fiber with planar axial anchoring are shown to be sensitive to magnetic fields. In particular, a homogeneous magnetic field oblique to the fiber drives translation of disclination loops along it. The velocit