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Αρχική    Effects of shear on the microstructure and mechanical properties of colloidal gels  

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Τίτλος Effects of shear on the microstructure and mechanical properties of colloidal gels
Συγγραφέας Χρυσουλάκη, Βασιλική
Σύμβουλος διατριβής Πετεκίδης, Γεώργιος
Περίληψη The last few years, the ability to tune structural and mechanical properties of soft matter through processing has great interest at industries related to food, personal care products or ceramics etc. A suspension of colloidal hard spheres is a model soft matter system that can be used to investigate such structural changes occurring during processing. In particular, the system we study here, is a depletion gel of nearly monodisperse Poly-methyl methacrylate (PMMA) particles at large volume fraction (44%). We use rheology in combination with confocal microscopy to probe the changes in the mechanical properties and the structure under oscillatory shear at various strain amplitudes and frequencies for different durations of pre-shear. We find that such colloidal gels exhibit a drop in their elastic modulus, after shearing, that depends on the applied strain amplitude (𝛾0), the shearing time and the frequency (𝜔) and it seems to be related with the crystallization of the gel and possibly with their approach to phase separation
Γλώσσα Αγγλικά
Ημερομηνία έκδοσης 2023-07-28
Συλλογή   Σχολή/Τμήμα--Σχολή Θετικών και Τεχνολογικών Επιστημών--Τμήμα Φυσικής--Πτυχιακές εργασίες
  Τύπος Εργασίας--Πτυχιακές εργασίες
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