Πτυχιακές εργασίες
Τρέχουσα Εγγραφή: 39 από 197
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Τίτλος |
Effects of shear on the microstructure and mechanical properties of colloidal gels |
Συγγραφέας
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Χρυσουλάκη, Βασιλική
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Σύμβουλος διατριβής
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Πετεκίδης, Γεώργιος
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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
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Γλώσσα |
Αγγλικά |
Ημερομηνία έκδοσης |
2023-07-28 |
Συλλογή
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Σχολή/Τμήμα--Σχολή Θετικών και Τεχνολογικών Επιστημών--Τμήμα Φυσικής--Πτυχιακές εργασίες
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Τύπος Εργασίας--Πτυχιακές εργασίες
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Μόνιμη Σύνδεση |
https://elocus.lib.uoc.gr//dlib/8/e/e/metadata-dlib-1687503032-307586-7049.tkl
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Εμφανίσεις |
245 |