Measurement of dynamic rheology during ageing of gelatine–sugar composites

Choi, Yun Hee; Lim, Seung Taik; Yoo, Byoungseung

doi:10.1111/j.1365-2621.2004.00871.x

Cited by 28 publications

(16 citation statements)

References 27 publications

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“…The magnitudes of G 0 and G 00 increased with increase in o. Ln Z* versus ln o plots also showed shear-thinning power law characteristics. This tendency is in good agreement with those found for other macromolecule-sucrose composites, such as corn starchsucrose [16], pectin-sucrose [18] and gelatin-sucrose composites [19]. In the rice starch-sucrose composite systems, the dynamic rheological data of ln (G 0 , G 00 ) versus ln o were also subjected to linear regression and Tab.…”

Section: Time-dependent Flow Behaviorsupporting

confidence: 85%

Rheology of Rice Starch-Sucrose Composites

Yoo

2005

Starch - Stärke

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The effect of sucrose at different concentrations (0, 10, 20 and 30%) on rheological properties of rice starch pastes (5% w/w) was investigated in steady and dynamic shear. The steady shear properties of rice starch-sucrose composites were determined from rheological parameters for power law and Casson flow models. At 257C all the starch-sucrose composites exhibited a shear-thinning flow behavior (n=0.25-0.44). The presence of sucrose resulted in the decrease in consistency index (K), apparent viscosity (Z a,100 ) and yield stress (s oc ). Dynamic frequency sweeps at 257C indicated that starch-sucrose composites exhibited weak gel-like behavior with storage moduli (G 0 ) higher than loss moduli (G 00 ). G 0 and G 00 values decreased with the increase in sucrose concentration. The dynamic (Z*) and steady-shear (Z a ) viscosities at various sucrose concentrations did not follow the Cox-Merz superposition rule. G 0 values as a function of aging time (10 h) at 47C showed a pseudoplateau region at long aging times. In general, the values of G 0 and G 00 in rice starch-sucrose composites were reduced in the presence of sucrose and depended on sucrose concentration.

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Section: Time-dependent Flow Behaviorsupporting

confidence: 85%

Rheology of Rice Starch-Sucrose Composites

Yoo

2005

Starch - Stärke

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“…34 Changing the pH of the gelatin should yield a similar effect, as discussed in Ref. 35, although one that is more difficult to standardize. We have demonstrated for the first time the feasibility of constructing viscoelastic elasticity phantoms from gelatin-sucrose composite as a practical benchmark for evaluating the degree of degradation incurred when linear-elastic MRE reconstruction methods are applied to such mediums.…”

Section: Fig 2 ͑A͒mentioning

confidence: 94%

The performance of steady‐state harmonic magnetic resonance elastography when applied to viscoelastic materials

et al. 2010

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Purpose:The clinical efficacy of breast elastography may be limited when the authors employ the assumption that soft tissues exhibit linear, frequency-independent isotropic mechanical properties during the recovery of shear modulus. Thus, the purpose of this research was to evaluate the degradation in performance incurred when linear-elastic MR reconstruction methods are applied to phantoms that are fabricated using viscoelastic materials. Methods: To develop phantoms with frequency-dependent mechanical properties, the authors measured the complex modulus of two groups of cylindrical-shaped gelatin samples over a wide frequency range ͑up to 1 kHz͒ with the established principles of time-temperature superposition ͑TTS͒. In one group of samples, the authors added varying amounts of agar ͑1%-4%͒; in the other group, the authors added varying amounts of sucrose ͑2.5%-20%͒. To study how viscosity affected the performance of the linear-elastic reconstruction method, the authors constructed an elastically heterogeneous MR phantom to simulate the case where small viscoelastic lesions were surrounded by relatively nonviscous breast tissue. The breast phantom contained four linear, viscoelastic spherical inclusions ͑10 mm diameter͒ that were embedded in normal gelatin. The authors imaged the breast phantom with a clinical prototype of a MRE system and recovered the shear-modulus distribution using the overlapping-subzone-linear-elastic image-reconstruction method. The authors compared the recovered shear modulus to that measured using the TTS method. Results: The authors demonstrated that viscoelastic phantoms could be fabricated by including sucrose in the gelation process and that small viscoelastic inclusions were visible in MR elastograms recovered using a linear-elastic MR reconstruction process; however, artifacts that degraded contrast and spatial resolution were more prominent in highly viscoelastic inclusions. The authors also established that the accuracy of the MR elastograms depended on the degree of viscosity that the inclusion exhibited. Conclusions:The results demonstrated that reconstructing shear modulus from other constitutive laws, such as viscosity, should improve both the accuracy and quality of MR elastograms of the breast.

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“…Oscillatory rheological properties Oscillatory (dynamic) rheological properties were used along with flow tests to provide insight on the structure of the samples (21). Dynamic frequency sweep tests were performed in the linear viscoelastic range to determine the frequency dependence of the storage modulus (G ') and loss modulus (G '') (22).…”

Section: Resultsmentioning

confidence: 99%

Rheological behaviors and microstructure of Oviductus Ranae hydrogels

Liang

Zhang

2012

Food Sci Biotechnol

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The rheological properties of Oviductus Ranae (OR) hydrogels were systematically investigated with shear viscosity, dynamic oscillation, and creep-recovery measurements. The viscosity curves displayed phenomena of shear thinning with increase of shear rate. The flow behaviors of the hydrogels were described using 2 representative rheological models. The lesser water was absorbed by OR, the higher viscosity and greater extent of thixotropy it presents. Dynamic viscoelasticity measurements indicated that the samples exhibit viscoelastic properties as physical gels. Creep curves also revealed that the hydrogels behave as viscoelastic solids. Damped oscillations were observed in the initial stage of creep tests (0-1 s). The viscoelastic moduli obtained from dynamic oscillations and those from damped oscillations agreed with each other. The strong dependence of rheological behaviour on network of OR hydrogels had been confirmed by electron microscopy.

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Measurement of dynamic rheology during ageing of gelatine–sugar composites

Cited by 28 publications

References 27 publications

Rheology of Rice Starch-Sucrose Composites

Rheology of Rice Starch-Sucrose Composites

The performance of steady‐state harmonic magnetic resonance elastography when applied to viscoelastic materials

Rheological behaviors and microstructure of Oviductus Ranae hydrogels

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