DÃ©formation photoinduite dans les films minces contenant des ...

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Chapter 2. Experimental setup and sample preparation 46The DR1 functionalization is achieved via a nucleophile addiction reaction of the DR1molecule on a (3-isocyanatopropyl)triethoxysilane (ICPTEOS) which leads to the formationof the molecule shown in Figure 2.16 that we will name Si-DR1.pastel-00527388, version 1 - 19 Oct 2010Figure 2.16: Si-DR1 preparation.The spacer has been chosen following the results reported in [6], where the role ofa carbazole molecule bearing an alkoxysilane group, that we will call Si-K, has beenstudied in the synthesis of photoactive materials constituted by linear and non linearmolecules. In this case, the absence of Si-K lead to the aggregation of DR1 molecules.2.4. Préparation de films mincesThe Si-K molecule is obtained with the reaction shown in Figure 2.17.FIG. 2.28: Fonctionnalisation de la molécules de carbazole par réaction de l’aminopropyl triéthoxysilane (A2.4.1.4 Préparation du solFigure 2.17: Si-K preparation.The synthesis of the sol-gel matrix bearing the DR1 molecules proceeds as explainedabove, starting from the three precursors: TEOS, Si-DR1 and Si-K. These are mixed inthe following molar ratio: Si-K/Si-DR1/TEOS = 4/2/1 in THF. This solvent has beenchosen for its miscibility with water and for its good solvent power towards the threeLa figure 2.29 precursors. représente les trois précurseurs moléculaires utilisés pour la synthèsA pH = 1 HCl solution is used to favor hydrolysis, with a ratio of 4 H2O molecules foréchantillons. Le TEOS est un agent réticulant tétrafonctionnel dont rôle est d’accroîevery Si, order to convert the most of the ethoxy groups in sylanol groups.rigidité de la structure finale du matériau.
Chapter 2. Experimental setup and sample preparation 47hydrolysis(2 hours)condensationTable 2.1: Sol-gel Si-DR1 preparation: experimental procedure.pastel-00527388, version 1 - 19 Oct 2010The solution is left 2 hours with a beater, at room temperature and in the darkness, inorder to protect the DR1 dyes [7]. Once the hydrolysis completed a small quantity ofTHF is added to adjust the viscosity of the sol. Then, the compound is filtered (0.2µm).The whole experimental procedure is reported in Table 2.1.
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Thèse de doctorat de l’Ecole Pol
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AcknowledgementsAt the beginning it
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vpastel-00527388, version 1 - 19 Oc
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ContentsAbstractiAcknowledgementsii
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List of Figures1.1 The trans/cis ph
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Page 18 and 19: Introduction 2In this work, we stud
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Page 22 and 23: Introduction 6azobenzene-containing
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Chapter 3. Microscopic mechanisms a
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pmmaChapter 3. Microscopic mechanis
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Chapter 4. Photomechanical response
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sg+goldChapter 4. Photomechanical r
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P-250s-4VChapter 4. Photomechanical
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P-250s-4VChapter 4. Photomechanical
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Chapter 5Nanostructured hybrid syst
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Chapter 5. Nanostructured hybrid sy
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Bibliography[1] A. Natansohn, P. Ro
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Conclusionspastel-00527388, version
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Bibliography[1] Chi-Ming Che et Al.
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Appendix A 156⎛ ⎞ ⎛n g sinθ
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Appendix A 158hence for each compon
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Appendix BPhotoisomerization dynami
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Appendix B 162( 1Since λ 2 = −(
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Appendix C 164L = 5000 nmu = 1 nmL!
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Appendix D 166n. light power densit
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Bibliography[1] A. Natansohn, P. Ro
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Bibliography 170azobenzene-containi
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Bibliography 172as estimated from a
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Bibliography 174[53] C. Barrett, A.
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