Concentration dependence of the critical viscoelastic properties of gelatin at the gel point

Michon, Camille; Cuvelier, Gérard; Launay, B.

doi:10.1007/bf00396681

Cited by 206 publications

(130 citation statements)

References 25 publications

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“…The temperature dependences (Fig. 4) melting temperature of the samples with 3 and 5 wt% gelatin: 28.5 and 30°C, respectively, which is in good agreement with published data [20]. Using linear ranges (in a semi-logarithmic scale) the apparent activation energies of viscous flow were estimated according to Eq.…”

Section: Macroviscosity Of the Media With Biopolymerssupporting

confidence: 87%

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Contrasting relationship between macro- and microviscosity of the gelatin- and starch-based suspensions and gels

2016

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The problem of correlation between rheological properties in macroand micro-scales of media with biopolymers of polypeptide (gelatin) and polysaccharide (starch) nature is investigated. The viscosity of the biopolymer solutions with concentrations 0.5-5 wt% was estimated by standard rotational rheometry technique and with fluorescent molecular rotor at 15-50°C. Opposite trends were observed for relationship between microviscosity g m and macroviscosity g for two biopolymers: g m \ \ g for gelatin and g m [ [ g for starch solutions. The temperature dependence of g m followed the monoexponential decay law in all samples over the whole temperature range indicating insensitivity of microviscosity to gel mesh melting under heating. The dissimilarity of macro-and micro-rheological properties of gelatin and starch-containing media is discussed in terms of difference in architecture of the gels.

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Section: Macroviscosity Of the Media With Biopolymerssupporting

confidence: 87%

“…For the gelatin gels (3 and 5 wt%) storage and loss moduli G 0 and G 00 were measured in dynamic mode (frequency-10 Hz, amplitude-0.5 %) as function of temperature in the range of 15-50°C. The gel melting point, also called critical temperature, was defined as the temperature where G 0 = G 00 [20].…”

Section: Rheologymentioning

confidence: 99%

Contrasting relationship between macro- and microviscosity of the gelatin- and starch-based suspensions and gels

2016

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“…The solution was then placed in a waterbath at 60 C for 45 min with further agitation every 10 min to ensure complete dissolution of the gelatin powder [47]. The gelatin solution was then aliquoted and stored at 5 C for a maximum of 2 days.…”

Section: Methodsmentioning

confidence: 99%

i-Rheo: Measuring the materials' linear viscoelastic properties “in a step”!

Tassieri

Laurati

Curtis

et al. 2016

Journal of Rheology

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We present a simple new analytical method for educing the materials' linear viscoelastic properties, over the widest range of experimentally accessible frequencies, from a simple step-strain measurement, without the need of preconceived models nor the idealization of real measurements. This is achieved by evaluating the Fourier transforms of raw experimental data describing both the time-dependent stress and strain functions. The novel method has been implemented into an open access executable "i-Rheo," enabling its use to a broad scientific community. The effectiveness of the new rheological tool has been corroborated by direct comparison with conventional linear oscillatory measurements for a series of complex materials as diverse as a monodisperse linear polymer melt, a bimodal blend of linear polymer melts, an industrial styrene-butadiene rubber, an aqueous gelatin solution at the gel point and a highly concentrated suspension of colloidal particles. a)

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“…The measurement of α is often challenging and is limited by sample mutation (Mours and Winter, 1994) and, as demonstrated in the present work, instrument inertia artefacts (when using CMT rheometers). Examples of the utility of GP data are widespread in terms of physical and chemical gels (Djabourov et al, 1988a;Hawkins et al, 2008;Hsu and Jamieson, 1993;Djabourov et al, 1988b;and Michon et al, 1993). Recently, GP characterisation of coagulating blood has been shown to provide a novel biomarker for healthy coagulation and a predictor of clot microstructure (Curtis et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

An enhanced rheometer inertia correction procedure (ERIC) for the study of gelling systems using combined motor-transducer rheometers

et al. 2017

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The rheological characterisation of viscoelastic materials undergoing a sol-gel transition at the Gel Point (GP) has important applications in a wide range of industrial, biological, and clinical environments and can provide information regarding both kinetic and microstructural aspects of gelation. The most rigorous basis for identifying the GP involves exploiting the frequency dependence of the real and imaginary parts of the complex shear modulus of the critical gel (the system at the GP) measured under small amplitude oscillatory shear conditions. This approach to GP identification requires that rheological data be obtained over a range of oscillatory shear frequencies. Such measurements are limited by sample mutation considerations (at low frequencies) and, when experiments are conducted using combined motor-transducer (CMT) rheometers, by instrument inertia considerations (at high frequencies). Together, sample mutation and inertia induced artefacts can lead to significant errors in the determination of the GP. Overcoming such artefacts is important, however, as the extension of the range of frequencies available to the experimentalist promises both more accurate GP determination and the ability to study rapidly gelling samples. Herein, we exploit the frequency independent viscoelastic properties of the critical gel to develop and evaluate an enhanced rheometer inertia correction procedure. The procedure allows acquisition of valid GP data at previously inaccessible frequencies (using CMT rheometers) and is applied in a study of the concentration dependence of bovine gelatin gelation GP parameters. A previously unreported concentration dependence of the stress relaxation exponent (α) for critical gelatin gels has been identified, which approaches a limiting value (α = 0.7) at low gelatin concentrations, this being in agreement with previous studies and theoretical predictions for percolating systems at the GP.

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Concentration dependence of the critical viscoelastic properties of gelatin at the gel point

Cited by 206 publications

References 25 publications

Contrasting relationship between macro- and microviscosity of the gelatin- and starch-based suspensions and gels

Contrasting relationship between macro- and microviscosity of the gelatin- and starch-based suspensions and gels

i-Rheo: Measuring the materials' linear viscoelastic properties “in a step”!

An enhanced rheometer inertia correction procedure (ERIC) for the study of gelling systems using combined motor-transducer rheometers

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