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Tytuł artykułu

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

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
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.
Słowa kluczowe
Wydawca

Rocznik
Tom
1
Numer
1
Opis fizyczny
Daty
otrzymano
2014-11-17
zaakceptowano
2015-03-02
online
2015-05-25
Twórcy
  • Dipartimento SIMAU, Università Politecnica delle
    Marche, Via Brecce Bianche, 60131 Ancona, Italy
autor
  • Dipartimento SIMAU, Università Politecnica delle
    Marche, Via Brecce Bianche, 60131 Ancona, Italy
autor
  • Dipartimento di Fisica, Università
    della Calabria, Via P.Bucci, Cubo 31 C, 87036 Arcavacata di Rende,
    Cosenza
  • Dipartimento di Fisica, Università
    della Calabria, Via P.Bucci, Cubo 31 C, 87036 Arcavacata di Rende,
    Cosenza
Bibliografia
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  • [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)
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  • [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]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_1515_odps-2015-0001
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