http://www.cnr.it/ontology/cnr/individuo/prodotto/ID201033
Attractive-repulsive dynamics on light-responsive chiral microparticles induced by polarized tweezers (Articolo in rivista)
- Type
- Label
- Attractive-repulsive dynamics on light-responsive chiral microparticles induced by polarized tweezers (Articolo in rivista) (literal)
- Anno
- 2013-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1039/C2LC40703E (literal)
- Alternative label
R.J. Hernández, A. Mazzulla, A. Pane, K. Volke-Sepulveda, G. Cipparrone (2013)
Attractive-repulsive dynamics on light-responsive chiral microparticles induced by polarized tweezers
in Lab on a chip (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- R.J. Hernández, A. Mazzulla, A. Pane, K. Volke-Sepulveda, G. Cipparrone (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR-IPCF UoS di Cosenza
Dip di Fisica Università della Calabria
Instituto de Fisica, UNAM, Apdo. Postal 20-364, 01000 Mexico D.F., Mexico (literal)
- Titolo
- Attractive-repulsive dynamics on light-responsive chiral microparticles induced by polarized tweezers (literal)
- Abstract
- Multifunctional colloidal micro and nano-particles with controlled architectures have very promising
properties for applications in bio and nanotechnologies. Here we report on the unique dichotomous
dynamical behaviour of chiral spherical microparticles, either fluid or solid, manipulated by polarized
optical tweezers. The particles are created using a reactive mesogen mixed with a chiral dopant to form
cholesteric liquid crystal droplets in water emulsion. The photopolymerization enables the chiral
supramolecular configurations to be frozen in solid particles. Different internal architectures in the
supramolecular structures, guided by the interfacial chemistry, enable optically isotropic or anisotropic
spherical objects to be obtained. For particles having radial configuration of the cholesteric helices, we
show that light can exert either a repulsive or attractive force depending on the handedness of its circular
polarization, due to the unique selective reflection property of the cholesteric phase. On the other hand,
very exotic dynamics is observed in the case of anisotropic chiral particles. Depending on the light
handedness, they behave like Janus spherical particles with dissimilar optical properties, meaning that the
surface of the dielectric particles is partly transparent and partly reflecting. We foresee interesting
potential applications in micro and optofluidics, microphotonics and materials science. (literal)
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