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2014 | 1 | 1 |
Article title

Polymer stabilized Monodispersed Liquid Crystal Droplets: Microfluidics Generation and Optical Analysis

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Abstracts
EN
Liquid crystal droplets are widely used in optics
and photonics applications. They can act as simple
resonators or be arranged in interconnected periodic configurations when their external dimension are similar. In
this work we optically analyze and describe the microfluidic
generation of liquid crystal droplets in a thermally stabilized
environment, namely water, which enables a narrow
droplets diameter distribution.We demonstrate a fine
control of the droplet dimensions in both nematic and
isotropic phases by controlling the ratio between liquid
crystal andwater flows. Droplets generated in the isotropic
phase show a complex internal structure which reflects
their high degree of internal disorder. Moreover, the internal
configuration of the droplets also depends on the
purity degree of the water in which they grow. In order to
investigate their size distribution and their internal structure,
a small amount of photo-polymerizable agent (NOA61
optical glue)was added to the liquid crystal to stabilize the
droplets structure and to avoid their coalescence. Acting
this way, polymer stabilized liquid crystal droplets were
created after light induced polymerization, which are stable
even after water evaporation. The polarized microscope
analysis shows that the bipolar or radial order of the
liquid crystal is still preserved inside the droplets depending
on the water purity. Moreover an improved size uniformity
is reported.
Publisher

Year
Volume
1
Issue
1
Physical description
Dates
received
17 - 11 - 2014
accepted
2 - 3 - 2015
online
25 - 5 - 2015
Contributors
  • Dipartimento SIMAU, Università Politecnica delle
    Marche, Via Brecce Bianche, 60131 Ancona, Italy
author
  • Dipartimento SIMAU, Università Politecnica delle
    Marche, Via Brecce Bianche, 60131 Ancona, Italy
author
  • Dipartimento di Fisica, Università
    della Calabria, Via P.Bucci, Cubo 31 C, 87036 Arcavacata di Rende,
    Cosenza
author
  • Dipartimento di Fisica, Università
    della Calabria, Via P.Bucci, Cubo 31 C, 87036 Arcavacata di Rende,
    Cosenza
References
  • [1] Liquid crystal-based emulsions: Progress and prospects, Alam,Mohammad, Mydul; Aramaki, Kenji; Journal of Oleo Science, v63, n 2, p 97-108, 2014[WoS]
  • [2] Liquid crystal emulsions as the basis of biological sensors forthe optical detection of bacteria and viruses, Sivakumar, Sri;Wark, Kim L.; Gupta, Jugal K.; Abbott, Nicholas L.; Caruso, Frank;Advanced FunctionalMaterials, v 19, n 14, p 2260-2265, July 24,2009
  • [3] Liquid crystal emulsions, Loudet, Jean-Christophe; Poulin,Philippe; Journal of Dispersion Science and Technology, v 23,n 1-3, p 143-154, 2002, Emulsion Science and Technology - Atribute to Paul Becher
  • [4] Microemulsions and liquid crystals, Flaim, Tony; Friberg, StigE.; Advances in Liquid Crystals, v 5, p 137-155, 1982
  • [5] Mosca, Monica; Murgia, Sergio; Ceglie, Andrea; Monduzzi,Maura; Ambrosone, Luigi, Journal of Physical Chemistry B, v 110,n 51, p 25994-26000, December 28, 2006
  • [6] Schambil, F. (Henkel KGaA, Duesseldorf, West Ger, HenkelKGaA, Duesseldorf, West Ger); Jost, F.; Schwuger, M.J.; Progressin Colloid & Polymer Science, v 73, p 37-47, 1987
  • [7] Band-edge and random lasing in paintable liquid crystal emulsions,Hands, P.J.W.; Gardiner, D.J.; Morris, S.M.; Mowatt, C.;Wilkinson, T.D.; Coles, H.J.; Applied Physics Letters, v 98, n 14,April 4, 2011[WoS][Crossref]
  • [8] Coherent random laser fluid of nematic liquid crystal emulsions,Nagai, Yusuke; Fujimura, Ryushi; Kajikawa, Kotaro;Japanese Journal of Applied Physics, v 53, n 1 PART 2, 2014, RecentAdvances in Molecular Electronics and Bio-electronics
  • [9] General Liquid-crystal droplets produced by microfluidics forurea detection, Khan, Mashooq1; Park, Soo-Young1; Sensorsand Actuators, B: Chemical, v 202, p 516-522, October 31, 2014[WoS]
  • [10] Gain narrowing and random lasing from dye-doped polymerdispersedliquid crystals with nanoscale liquid crystal droplets,Liu, Y.J; Sun, X.W; Elim, H.I.2; Ji, W.; Applied Physics Letters, v89, n 1, 2006
  • [11] Tuneable multicoloured patterns from photonic crosscommunicationbetween cholesteric liquid crystal droplets,Noh, Junghyun; Liang, Hsin-Ling; Drevensek-Olenik, Irena;Lagerwall, Jan P. F.; Journal of Materials Chemistry C, v 2, n 5, p806-810, February 7, 2014[Crossref][WoS]
  • [12] P.G. De Gennes; The Physics of Liquid Crystals (International Seriesof Monographs on Physics) Paperback – August 10, 1995,Oxford University Press; 2 edition (August 10, 1995)
  • [13] P.S. Drzaic, Liquid Crystal Dispersions, World Scientific, Singapore,1995
  • [14] Provenzano, C., Mazzulla, A., Pagliusi, P., De Santo, M.P.,Desiderio, G., Perrotta, I., Cipparrone, G.; Self-organized internalarchitectures of chiral micro-particles (2014), APLMaterials,2 (2), art. no. 022103
  • [15] Mazzulla, A., Cipparrone, G., Hernandez, R.J., Pane, A., Bartolino,R. Self-organized chiral microspheres (2013), MolecularCrystals and Liquid Crystals, 576 (1), pp. 15-22.[WoS]
  • [16] Polarization dependent Bragg diffraction and electro-opticswitching of three-dimensional assemblies of nematic liquidcrystal droplets, Fernandez-Nieves, A.; Link, D.R.; Weitz, D.A.;Applied Physics Letters, v 88, n 12,March 20, 2006; Article number:121911.
  • [17] Monodisperse Emulsion Generation via Drop Break Off in aCoflowing Stream, P. B.Umbanhowar, V. Prasad, and D. A. Weitz;Langmuir 2000, 16, 347-351.[Crossref]
  • [18] Optically Anisotropic Colloids of Controllable Shape, A.Fernández-Nieves, G. Cristobal, V. Garcés-Chávez,G.C. Spalding,K. Dholakia and D.A. Weitz, Advanced Materials, Volume17, Issue 6, Pages 647–778.
  • [19] Microfluidic flow focusing: Drop size and scaling in pressureversus flow-rate-driven pumping,ThomasWard,Magalie Faivre,Manouk Abkarian, Howard A. Stone; Electrophoresis 2005, 26,3716–3724.
  • [20] Development of a new kind of holographic grating made of liquidcrystal films separated by slices of polymeric material, R.Caputo, L. De Sio, A. V. Sukhov, A. Veltri, C. Umeton; Opt. Lett.29, 1261-1263 (2004).[Crossref][PubMed]
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_1515_odps-2015-0001
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