(Downloads - 0)
For more info about our services contact : help@bestpfe.com
Table of contents
Acknowledgements
Abstract
Résumé
List of publications
General introduction
1 State of the art: dynamics and synthesis of microcapsules
1.1 Introduction
1.2 Basic concepts of microcapsules
1.2.1 Scales, configuration and properties
1.2.2 Applications
1.3 Modelling of capsule membrane
1.3.1 2D membrane
1.3.2 3D membrane
1.4 Capsules in flows
1.4.1 Deformation
1.4.2 Dynamics
1.5 Capsule wrinkling in flows
1.5.1 A brief review
1.5.2 Wrinkling energies
1.6 Capsule membrane breakup
1.7 Synthesis of microcapsules
1.7.1 Liquid cores formation
1.7.2 Membrane formation
1.7.3 Rheological properties
1.7.4 Morphology
1.7.5 Stability
1.8 Conclusion
2 Materials and methods
2.1 Introduction
2.2 Chemicals and solutions
2.3 Microcapsules synthesis
2.3.1 Decoupling interface emulsion
Drop-templates generation
Membrane assembly
2.3.2 Stability of capsules during membrane assembly
2.3.3 Control route of physical properties
2.4 Stability of capsules in suspending fluids
2.4.1 Qualitative observation of capsules stability in common oils
2.4.2 Pre-stress control on membrane
2.5 Planar extensional flow
2.5.1 Visualization
Photography of capsules
Cross-slot chamber
2.5.2 Flow field and validation
2.6 Determination of membrane elasticity
2.7 Atomic force microscopy
2.8 Scanning electron microscopy
2.9 Discussion and conclusion
3 Interfacial rheology of microcapsules
3.1 Introduction
3.2 Membrane shear elasticity
3.2.1 Effect of capsule size
3.2.2 Effect of reaction time
3.2.3 Effect of concentrations
3.2.4 Effect of pre-stress
3.3 Membrane thickness and elasticity
3.3.1 Membrane thickness
3.3.2 Shear modulus
3.4 Yield stress and plasticity
3.4.1 Yield deformation
3.4.2 Relaxation
3.5 Discussion and conclusion
4 Microcapsules breakup
4.1 Introduction
4.2 Parameters definition
4.3 Comparison of drops and capsules
4.3.1 Overall observation
4.3.2 Interfaces deformation
4.3.3 Steady-state and time-dependent deformation
4.3.4 Critical breakup in various viscosity ratios
4.4 Breakup phase diagrams
4.5 Mechanism of breakup
4.5.1 Low Gs (< 0.1 N/m)
4.5.2 High Gs (> 0.1 N/m)
4.6 Post breakup
4.7 Discussion and conclusion
5 Wrinkling instability in the Near-Threshold regime
5.1 Introduction
5.2 Wrinkling induced by flow
5.3 Wrinkling at threshold
5.3.1 Critical wrinkling stress
5.3.2 Onset and development
5.4 Phase diagram
5.5 Wavelength and wave number in NT
5.6 Discussion and conclusion
6 Wrinkling instability in the Far-from-Threshold regime
6.1 Introduction
6.2 Relaxation of compression
6.3 Wrinkling length development
6.4 Wavelength
6.4.1 In the NT regime
6.4.2 In the FT regime
6.5 Phase diagram
6.6 Discussion and conclusion
7 Conclusions and perspectives
7.1 General conclusions
7.2 Perspectives
7.2.1 Interfacial rheology
7.2.2 Relaxation of elastic capsules
7.2.3 Wrinkles-to-folds transition
A Protocol of solutions preparation
A.1 Chitosan solution (CHT)
A.2 Phosphatidic fatty acids solution (PFacidYN)
A.3 Human serum albumin solution (HSA)
A.4 Terephthaloyl chloride solution (TC)
A.5 Suspending fluids
A.6 Physico-chemical properties of the chemicals
A.7 Treatment of silicone oil
B Microfluidics system
B.1 Configuration of T-junction chip
B.2 Flow rate controlled system
C Models of flow chambers
C.1 Design of the flow chamber
D Dry membrane preparation
D.1 Drying process
D.2 Membrane tailoring for SEM
D.2.1 Flat membrane
D.2.2 Capsule membrane
E Capsules breakup preparation
E.1 Viscosity ratio adjustment
E.2 Particles decoration at water-oil interface
E.3 Capsules and droplets preparation
E.4 Fluorescent capsules preparation
E.5 Interfacial tension measurement
E.6 Interfacial rheology measurement
E.7 Fluorescent capsule Gs > 0.1 N/m during rupture
F Wrinkling instability of CHT/PFacidYN capsules
F.1 Estimation of wrinkles arc length
F.2 Estimation of wavelength w
Bibliography
