4(%3)3 - Ecole nationale supÃ©rieure de chimie de Montpellier

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Figure – 1.30: The repair and go strategy, a) Optical image of a cracked, b) PCOE–g–PC polymer used for dropletstabilization and nanoparticle (NP) encapsulation, c) Frame from a simulation depicting nanoparticle deposition(blue particles) into a crack, followed by rolling of the capsule to the next crack (red arrow), d) Fluorescencemicrograph of a substrate following nanoparticle deposition into the cracks 164 .Stable droplets mimicking the microspheres were prepared by sonicating an aqueous solution ofpoly(cyclooctene)–g–poly(phosphorylcholine) with trichlorobenzene containing fluorescent CdSenanoparticles, to give polydisperse droplet samples (60±30 µm in diameter). This droplet solution waspassed along an oxidized surface of poly(dimethyl siloxane) substrate at a flow rate of 0.5 ml/s, in 50pulsed intervals, with 4 s of flow and 10 s of rest. It was noted that the ‘rest’ period was vitally significantfor the desired deposition of nanoparticles with reduced deposition into the cracks was observed in caseof short rest times whereas long rest periods resulted in more extensive particle deposition both in thecracks and surrounding areas. The substrate was rinsed thoroughly with pure water at the end of theexperiment and analyzed with fluorescence microscopy. The observed fluorescence on the surface waslargely confined to the crack planes indicating the presence of deposited CdSe nanoparticles.The larger size of the droplets relative to cracks and the antifouling propertiesimparted to them by the hydrophilic PC-substituents of the PCOE–graft–PC polymer were noted to becontributing factors for their reversible deposition over the surface thus promoting the “repair and go”process. Further, the very thin polymer layer between the hydrophobic CdSe nanoparticles and cracksurface enabled an easy translocation within the time frame in which the droplets are in contact with the37
cracks. The recovered droplets after rinsing were found to be stable thus strengthening the fact thatselective deposition of nanoparticles takes place without bursting the droplets via translocation acrossthe thin polymer membrane.38
Page 1: THESISPRESENTED ATNATIONAL GRADUATE
Page 4 and 5: As the human civilization progress
Page 6 and 7: CHAPTER - 1 SELF-HEALING POLYMERIC
Page 8: 8.1.5 Atomic Force Microscopy …
Page 11 and 12: Synthetic engineering materials in
Page 13 and 14: esponse to a specific external stim
Page 15 and 16: The first work based on this approa
Page 17 and 18: een prepared from urea-formaldehyde
Page 19 and 20: monomer systems. The addition of EN
Page 21 and 22: Figure - 1.10: Self-healing process
Page 23 and 24: was required to reach healing effic
Page 25 and 26: In addition to above works, some ot
Page 27 and 28: that have been identified to be tak
Page 29 and 30: part of the chapter, these material
Page 31 and 32: Figure - 1.17: Self-healing of the
Page 33 and 34: commercialized under tradenames; Nu
Page 35 and 36: joined together at temperature high
Page 37 and 38: Inspired by these findings, the fir
Page 39 and 40: temperature greater than 80 o C in
Page 41 and 42: Figure - 1.27: Sulfur chemistry bas
Page 43 and 44: A different kind of sulfur chemistr
Page 45: Figure - 1.29: Dynamic covalent che
Page 49 and 50: 23 White, S. R. et al. Autonomic he
Page 51 and 52: 65 Taber, D. F. & Frankowski, K. J.
Page 53 and 54: 107 Kushner, A. M., Vossler, J. D.,
Page 55: 148 Park, J. S., Kim, H. S. & Hahn,
Page 58 and 59: The value of subscripts “n”,
Page 60 and 61: The formation of spherical micelles
Page 62 and 63: the micelle assembly showed the pre
Page 64 and 65: gain onto the electrodes by buildin
Page 66 and 67: The resistance R can be further exp
Page 68 and 69: empty-tower velocity U only depends
Page 70 and 71: This apparent morphological switchi
Page 72 and 73: In a further qualitative analysis,
Page 74 and 75: noteworthy and though its feasibili
Page 76 and 77: Furthermore within this range, lowe
Page 78 and 79: Figure - 2.22: Scanning Electron Mi
Page 80 and 81: While the resistance measurements g
Page 82 and 83: In conclusion, a self-healing membr
Page 84 and 85: 23 Giacomelli, F. C., Riegel, I. C.
Page 86 and 87: micelles enabled the membrane to se
Page 88 and 89: The second class is represented by
Page 90 and 91: To avoid the probable clogging of t
Page 92 and 93: 181614SP2 - iNumber of Particles121
Page 94 and 95: 1000900800y = 3E+06xR² = 0,9911y =
Page 96 and 97:
very high value of 1.5 g.l -1 . Thi
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Since the only change in the membra
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100Retention (%)8060400,100,20,40,6
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Figure - 3.18: Scanning Electron Mi
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(Figure - 3.20). A cursory look at
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When compared to poly(styrene) NPs,
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Figure - 3.24: Scanning Electron Mi
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REFERENCES1 Metzler, R. & Klafter,
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46 Bemporad, D., Luttmann, C. & Ess
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In this chapter, preparation of 3D
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obtain complex macromolecular archi
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The polymerization was conducted at
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proceeds, lesser monomer is availab
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mg/ml),the micelles’ hydrodynamic
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Figure - 4.15: The monolayer and mu
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monolayer of micelles and topmost l
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The presence of the dispersed micel
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Heating the multilayer micelle asse
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stable zipping of the micelles. Mul
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24 Moad, G., Rizzardo, E. & Thang,
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The concept of nano-gel based self-
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Figure - 5.4: Size distribution of
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In a typical process, the two compo
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Figure - 5.10: 1HNMR spectra obtain
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The 1 HNMR spectrum obtained for th
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REFERENCES1 White, S. R. et al. Aut
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healing ability shown by the membra
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7. PERSPECTIVESBeing the first such
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8. MATERIALS & METHODSThis chapter
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8.1.3 PEG Filtration MeasurementsTh
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addition of TEOS due to formation o
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solution was ultrasonicated for 15
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Triethylamine (TEA) (Sigma-Aldrich
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To prepare the monolayer assembly o
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was added followed by addition of 0
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ELABORATION OF SELF-HEALING POLYMER
Page 170 and 171:
ELABORATION DES MEMBRANES POLYMERES
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4(%3)3 - Ecole nationale supÃ©rieure de chimie de Montpellier

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