NDLI: Dynamic study of gelatin gels by creep measurements

Content Provider	Springer Nature Link
Author	rmand, Valéry Ravey, Jean Claude
Copyright Year	1997
Abstract	We have investigated the dynamical properties of gelatin gels using creep measurements. A commercial apparatus (Carrimed CSL500) was modified in order to increase the deformation of the gel and to take advantage of the inertia of the system. When a step stress is applied, the very first response of these materials is an oscillating strain owing to a coupling of the high elasticity of the gelatin gels and the inertia of the apparatus. From these damped oscillations, we have extracted the elastic and loss moduli as a function of frequency, which allows us to widen the frequency range (toward high frequencies) of measurement. After subtraction of the oscillations, we have obtained the compliance funtion from which, using Ferry's formalism, we can calculate the relaxation time distribution function over a very large time range (10−3–104 s). We show that the dynamics of gelatin gels is governed by two very different characteristic times. We interpret the faster relaxation time as relaxation at the scale of the gel network mesh-size, while the slower time we assign to relaxations involving the lifetime of the gelatin gel cross-links. It is now possible to use creep measurements as an alternative to the forced oscillatory function determination, as the same data can be obtained but, more quickly, and over a large frequency range. This gives us more indication of the gel's structure (gel network behaviour, kinetics of ageing) than all the laborious methods previously necessary.
Starting Page	610
Ending Page	617
Page Count	8
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	36
Issue Number	6
e-ISSN	14351528
Language	English
Publisher	Steinkopff-Verlag
Publisher Date	1997-01-01
Publisher Place	Darmstadt
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gelatin gels creep measurements free oscillations continuous spectrum of characteristic times gel structure Polymer Sciences Condensed Matter and Material Sciences Materials Processing, Characterization, and Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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