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     Accueil > Équipe Couches Minces & Nanomatériaux > Jean-François Blach - En français
 
Jean-François Blach was born in Béthune (France) in 1975. He received his Ph.D. degree from the Université d'Artois in 2003 under the supervision of Professor M. Warenghem in the field of liquid crystals and ferroelectric thin films (click here for downloading my PhD thesis in french). In 2004, he became ATER (non-permanent researcher and teacher) in TheLaboratoire de ThermoPhysique de la Matière Condensée of the Université du Littora, Côte d'Opale at Dunkerque under the supervision of Professor J.M. Buisine. During this year he has studied the vibrational properties of PDLC (Polymer dispersed Liquid Crystal) by Raman scattering. In 2005, he became ATER (non-permanent researcher and teacher) in The Laboratoire de Physique de la Matière Condensée of the Université de Picardie Jules Verne at Amiens under the supervision of Professor M. Karkut and J. Pavel. During this year he has studied the phase transition of a ferroelectric liquid crystal by the measure of pyroelectric current. In 2006, he became non-permanent researcher in the «Laboratoire de Physico-Chimie des Interfaces et Applications» in Lens in the Liquid Crystals Group directed by the Professor M. Warenghem. Now he is «Maître de Conférences» at the University of Artois in Lens and he performs his research in the nanomaterial for photonic team of the UCCS. His research field concerns the dispersion of nanoparticles (ferroelectric material or metallic material) in organic medium (liquid crystal) in the goal to share the properties of the former with the host medium.
November 2012: he obtained the Habilitation to supervise research at the University of Artois under the supervision of Pr. Henninot. The topic of this Habilitation concerned the electro-optical properties of nanoparticles and liquid crystals.

Keywords : Nanoparticles, Raman spectrometry, Electro-optical properties, anisotropic medium.

 

TEMCourbesSchema
TEM image of a BaTiO3 ferroelectric nanoparticle. Yellow : electro-optical curve of pure nematic liquid crystal, 5CB (threshold @ 0.79 Vrms)
Red : electro-optical curve of doped nematic liquid crystal, 5CB + BaTiO3 (threshold @ 0.54 Vrms).
Scheme of the Interaction between liquid crystal molecules and the permanent dipole of ferroelectric nanoparticles.

Publications 2017:

  1. «Aluminosilicate glass thin films elaborated by Pulsed Laser Deposition»
    T. Carlier, S. Saitzek, F. O. Méar, J-F. Blach, A. Ferri, M. Huvé, L. Montagne
    Applied Surface Science, 397 (2017) 13–18
    - doi: 10.1016/j.apsusc.2016.11.115

Publications 2016:

  1. «Synthesis, structural and luminescence properties of (La1-xLnx)2Ti2O7 (Ln = lanthanides) solid solutions»
    A. Bayart, A. Katelnikovas, J-F. Blach, J. Rousseau, S. Saitzek
    Journal of Alloys and compounds, 683, 634-646
    - doi: 10.1016/j.jallcom.2016.05.041

  2. «Self-Healing Glassy Thin-Coating for High Temperature Applications»
    S. Castanié, T. Carlier, F.O. Mear, S. Saitzek, J. F. Blach, R. Podor, L. Montagne
    ACS Appl. Mater. Interfaces, 2016, 8 (6), pp 4208–4215
    - doi: 10.1021/acsami.5b12049
    Voir aussi «Publications marquantes 2016»

Publications 2015:

  1. «Tailoring Anisotropic Interactions Between Soft Nanospheres Using Dense Arrays of Smectic Liquid Crystal Edge Dislocations»
    D. Coursault, J-F. Blach, J. Grand, A. Coati, A. Vlad, B. Zappone, D. Babonneau, G. Levi, N. Felidj, B. Donnio, J-L. Gallani, M. Alba, Y. Garreau, Y. Borensztein, M. Goldmann, E. Lacaze
    ACS Nano, 2015, 9 (12), pp 11678–11689
    - doi: 10.1021/acsnano.5b02538
    Voir aussi «Publications marquantes 2015»

  2. «Lead-Free α-La2WO6 Ferroelectric Thin Films»
    T. Carlier, M.-H. Chambrier, A. Ferri, S. Estradé, J.-F. Blach, G. Martín, B. Meziane, F. Peiró, P. Roussel, F. Ponchel, D. Rčmiens, A. Cornet, R. Desfeux
    ACS Appl. Mater. Interfaces, 2015, 7 (44), pp 24409–24418
    - doi: 10.1021/acsami.5b01776
    Voir aussi «Publications marquantes 2015»

  3. «Bio-inspired Titanium Drug Eluting Platforms Based on Poly-β-cyclodextrin/chitosan Layer-by- Layer Self Assembly Targeting Infections»
    A. Perez Anes, M. Gargouri , W. Laure , H. Van den Berghe , E. Courcot , J. Sobocinski , N. Tabary , F. Chai , J-F. Blach , A. Addad , P. Woisel , D. Douroumis , B. Martel , N. Blanchemain , and J. Lyskawa
    ACS Appl. Mater. Interfaces, 2015, 7 (23), pp 12882–12893
    - doi: 10.1021/acsami.5b02402
    Voir aussi «Publications marquantes 2015»

  4. «Refractive indices and birefringence of hybrid liquid crystal - nanoparticles composite materials in the terahertz region»
    E. Mavrona, U. Chodorow, M. E. Barnes, J. Parka, N. Palka, S. Saitzek, J.-F. Blach, V. Apostolopoulos and M. Kaczmarek
    AIP Advances, 5, 077143
    - doi: 10.1063/1.4927392

  5. «Effective piezoelectric coefficient measurement of BaTiO3 thin films using the X-ray diffraction technique under electric field available in a standard laboratory»
    V. Thery, A. Bayart, J-F. Blach, P. Roussel, S. Saitzek
    Applied Surface Science Volume 351, 1 October 2015, Pages 480–486
    doi: 10.1016/j.apsusc.2015.05.155

  6. «Growth of Ca3Co4O9+δ thin film on sapphire substrate and CGO dense pellet by pulsed laser deposition. Structural, microstructural, surface and electrochemical characterizations»
    M.H. Chambrier, D. Huo, V. Thoréton, A. Rolle, A.S. Mamède, S. Estradé, J.F. Blach, C. Pirovano, S. Daviero-Minaud, P. Roussel, F. Peiró, R.N. Vannier
    Solid State Ionics vol. 273, pg. 13-17 (2015)
    - doi: 10.1016/j.ssi.2014.10.026

  7. «Electrically charged dispersions of ferroelectric nanoparticles»
    O. Kurochkin, E. Mavrona, V. Apostolopoulos, J-F. Blach, J-F. Henninot, M. Kaczmarek, S. Saitzek, M. Sokolova and Y. Reznikov
    Appl. Phys. Lett. 106, 043111 (2015)
    - doi: 10.1063/1.4907224

Publications 2014:

  1. «Elastic Constants, Viscosity and Response Time in Nematic Liquid Crystals Doped with Ferroelectric Nanoparticles»
    N. Podoliak, O. Buchnev, M. Herrington, E. Mavrona, M. Kaczmarek, A. G. Kanaras, E. Stratakis, J–F. Blach, J–F. Henninot, M. Warenghem
    RSC Adv., 2014, 4, 46068–46074
    - doi: 10.1039/C4RA06248E

  2. «A direct novel synthesis of highly uniform dispersed ruthenium nanoparticles over P6mm ordered mesoporous carbon by host/guest complexes»
    N. Gokulakrishnan, G. Peru, S. Rio, J.F. Blach, B. Leger, D. Grosso, E. Monflier, A. Ponchel
    J. Mater. Chem. A, 2014, 2, 6641–6648
    - doi: 10.1039/C4TA00038B
    Voir aussi «Publications marquantes 2014»

Selected publications:

  1. «Combined ellipsometry and refractometry technique for characterisation of Liquid Crystal based nanocomposites»
    M. Warenghem, J-F. Henninot, J-F. Blach, O. Buchnev, M. Kaczmarek, M. Stchakovsky
    Review of Scientific Instruments, 83, pp 035103-1 à 035103-6 (2012)

    doi : http://dx.doi.org/10.1063/1.3690382

  2. «Formation of nanometric HT-LiCoO2 by a precipitation and aging process in alcoholic solution»
    D. Larcher, B. Delobel, L. Dantras-Laffont, E. Simon, J-F. Blach, E. Baudrin
    Inorg. Chem., 2010, 49 (23), pp 10949–10955 -
    doi : 10.1021/ic101324e

  3. «Enhancement of dye fluorescence recovery in nematic liquid crystals using a spatial optical soliton»
    JF. Henninot, JF. Blach and M. Warenghem
    J. Appl. Phys. 107, 113111 (2010)
    - doi : 10.1063/1.3446091

  4. «One-step precipitation of nanometric LiMO2 powders (M=Co, Fe) in alcoholic media»
    B. Delobel, D. Larcher, J.-F. Blach, L. Croguennec, M. Ménétrier, E. Simon, E. Baudrin
    Solid State Ionics, 181, 623–630 (2010)
    - doi :10.1016/j.ssi.2010.03.004

  5. «BaTiO3 ferroelectric nanoparticles dispersed in 5CB nematic liquid crystal : synthesis and electro-optical characterization»
    J.-F. Blach, S. Saitzek, C. Legrand, L. Dupont, J.-F. Henninot, M. Warenghem
    J. Appl. Phys. 107, 074102 (2010)
    - doi : 10.1063/1.3369544

  6. «Enhancement in nanoscale electrical properties of PZT island fabricated by Focused Ion Beam before crystallization»
    R.H. Liang, D. Rémiens, D. Deresmes, D. Troadec, X. L. Dong, L.H.Yang, R. Desfeux, A. Da Costa, J.F. Blach
    Journal of Applied Physics, 105, 044101 2009,
    doi : 10.1063/1.3073892

  7. «the investigation of an electrically stabilized optical spatial soliton induced in nematic liquid crystal»
    JF Henninot, JF Blach, M warenghem
    Journal of Optics A: Pure and Applied Optics 10 085104 (2008)

Scientific work:

  • «Propagation of light confined via Thermo-Optical effect in nematic liquid crystals»
    J-F. Blach, J-F. Henninot, M. Warenghem
    In «Nematicons ; Spatial optical solitons in Nematic Liquid Crystals» (Ed.:Wiley)
    Chapter 9 - pp 233-252. (ISBN: 978-0-470-90724-5)


Selected communications:

  • «A Simple Ray Tracing to Model Spatial Soliton Propagation in 2D Heterogeneous Nematic Liquid Crystal»
    M. Warenghem, J-F Blach, and J.-F. Henninot
    IEEE LEOS Winter Topicals Conférence, Sorrento (Italy), January 2008


  • «First observation and analysis of spatial solitons observed in polymer-stabilized nematic liquid crystal»
    J-F Henninot, J-F Blach, A. Daoudi and M. Warenghem
    XIIth International Topical Meeting on Optics of Liquid Crystals, Puebla (Mexico), october 2007


 

 

 
 

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