Scaling Behaviour of the Viscoelastic Properties of a Biopolymer System Near the Gel Point

1989 ◽  
Vol 177 ◽  
Author(s):  
M. A. V. Axelos ◽  
M. Kolb
Keyword(s):  
Steady State ◽  
Percolation Theory ◽  
Viscoelastic Properties ◽  
Sol Gel ◽  
Oscillatory Shear ◽  
Gel Point ◽  
Rheological Measurements ◽  
Scaling Behaviour ◽  
Sol Gel Transition ◽  
Gel Transition

ABSTRACTRheological measurements have been performed on pectin-calcium systems close to the sol-gel transition. Two different experimental setups - steady state and oscillatory shear measurements - show scaling of the viscoelastic properties. The results of both types of measurements are consistent with each other and with scalar percolation theory.

Role of viscoelasticity in the tube model of airway reopening. II. Non-Newtonian gels and airway simulation

1996 ◽  
Vol 80 (5) ◽  
pp. 1649-1659 ◽  
Author(s):  
S. H. Hsu ◽  
K. P. Strohl ◽  
M. A. Haxhiu ◽  
A. M. Jamieson
Keyword(s):  
Viscoelastic Properties ◽  
Flow Instability ◽  
Sol Gel ◽  
Tube Model ◽  
Airway Reopening ◽  
Pharyngeal Airway ◽  
Airway Tube ◽  
Sol Gel Transition ◽  
Gel Transition

The influence of viscoelastic gels as lining fluids on the pressure-velocity relationships in an airway tube model (Gaver et al. J. Appl. Physiol. 69: 74-85, 1990) was examined. A flow instability was observed due to the occurrence of a sol-gel transition in the viscoelastic properties under flow conditions. We further report measurements of the viscoelastic properties of airway secretions. Airway secretions are gels under small strains and have a yield stress of 4-7 dyn/cm2. Secretions from the pharyngeal airway show lower elasticity than secretions from the trachea. The airway reopening process is simulated using a Weibel lung geometry by incorporating the constitutive equations from the model gel studies and utilizing the rheological data on airway secretions. In these simulations, a "popping-open" phenomenon arises from a flow instability in airway generations 8-14 when the rheological properties of the lining fluids are assumed to be similar to those of pharyngeal secretions. On the basis of these studies, the elasticity of airway secretions plays an important role in airway reopening.

Effect of dimethylsulfoxide on the viscoelastic properties and sol–gel transition of cellulose/ionic liquid solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 8318-8322 ◽  
Author(s):  
H. Saba ◽  
Y. Yongbo ◽  
W. Jianning ◽  
X. Xiaolin ◽  
W. Kaijian ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Viscoelastic Properties ◽  
Sol Gel ◽  
Liquid Solutions ◽  
Sol Gel Transition ◽  
Rheological Experiments ◽  
Gel Transition

Viscoelastic properties of cellulose solutions with 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) and dimethylsulfoxide (DMSO) as solvents were studied by rheological experiments.

Sol-Gel Transition Kinetics of Konjac Glucomannan Dilute Solution by Fluorescence Technique

2011 ◽  
Vol 399-401 ◽  
pp. 1326-1329
Author(s):  
Dong Ying Xu ◽  
Zheng Fu Liao ◽  
Hui Wang
Keyword(s):  
Chemical Engineering ◽  
Drug Carrier ◽  
Sol Gel ◽  
Konjac Glucomannan ◽  
Gel Point ◽  
Pharmaceutical Chemical ◽  
Dilute Solution ◽  
Sol Gel Transition ◽  
Kinetics Of ◽  
Gel Transition

Konjac glucomannan (KGM) has been widely used in pharmaceutical, chemical engineering, food industry, drug carrier delivery, etc. The sol-gel transition kinetics of KGM dilute solution was studied by steady fluorescence spectroscopy in this article. The results showed that the gel point of KGM solutions depend on the concentration of KGM, pH value and temperature. The sol-gel phase transition activation energy, ΔE, was calculated to be 83.1 kJ/mol based on first reaction kinetic model.

scholarly journals Detection of Exhaust Particulate Induced Blood Clotting Anomalies using Rheometric Techniques

2021 ◽  
Author(s):  
◽  
Rebecca Hudson
Keyword(s):  
Blood Clotting ◽  
Sol Gel ◽  
Oscillatory Shear ◽  
Gel Point ◽  
Small Amplitude Oscillatory Shear ◽  
Fibrin Gels ◽  
Blood Clots ◽  
Frequency Independent ◽  
Sol Gel Transition ◽  
The Impact

Characterisation of viscoelastic materials through exploitation of the frequency independent gel point (GP) can be used to study blood clotting anomalies. Information regarding the sol-gel transition can be obtained for gelling systems by employing small amplitude oscillatory shear (SAOS) measurements over a range of oscillatory shear frequencies. Analysis of the fractal dimension, , at the GP has previously been used as a biomarker for pathologies related to thromboembolic disease. This thesis investigates the potential adverse clotting characteristics induced by the presence of exhaust particulates using rheometric techniques. SAOS experiments conducted using a combined motor transducer (CMT) rheometer are susceptible to inertial artefacts at high frequencies, leading to potentially significant error in the reported GP. Herein, the development and evaluation of an enhanced rheometer inertia correction procedure (ERIC) is shown to allow valid GP data to be obtained post-acquisition at previously inaccessible frequencies. The potential impact of soot particulates on coagulation is likely to be small due to the weakly elastic gelling systems being studied, thus necessitating the use of the ERIC procedure to remove the presence of any inertial artefacts causing miscalculation of the GP. Fibrin gels were studied as model blood clots to assess the effects of the inclusion of soot particulates on the GP. The impact of the inclusion of increasing concentrations of soot solution on the GP proved inconclusive after the application of ERIC. However, in whole blood clots, the post-ERIC GP data indicated an increase in the density of the clot formed with increasing soot concentration, suggesting an elevated health risk as a possible result of interruption of the clotting cascade due to soot particulates.

Sol–gel transition in SnO2 colloidal suspensions: viscoelastic properties

1999 ◽  
Vol 247 (1-3) ◽  
pp. 153-157 ◽  
Author(s):  
L.R.B. Santos ◽  
C.V. Santilli ◽  
S.H. Pulcinelli
Keyword(s):  
Viscoelastic Properties ◽  
Sol Gel ◽  
Colloidal Suspensions ◽  
Sol Gel Transition ◽  
Gel Transition

COMPLEX VISCOELASTIC BEHAVIOUR AT THE SOL-GEL TRANSITION

Fractals ◽  
2003 ◽  
Vol 11 (supp01) ◽  
pp. 9-17 ◽  
Author(s):  
LUCILLA DE ARCANGELIS ◽  
EMANUELA DEL GADO ◽  
ANTONIO CONIGLIO
Keyword(s):  
Viscoelastic Properties ◽  
Sol Gel ◽  
Relaxation Behaviour ◽  
Cubic Lattice ◽  
Theoretical Predictions ◽  
Fluctuation Dynamics ◽  
Sol Gel Transition ◽  
Bond Fluctuation ◽  
Good Agreement ◽  
Gel Transition

We present a percolation dynamic model for the study of dynamics at the sol-gel transition. Percolation and bond-fluctuation dynamics result to be suited to study the critical behaviour of the viscoelastic properties and show a complex relaxation behaviour. The results obtained via numerical simulation on the cubic lattice are in good agreement with some theoretical predictions and experimental results.

Rheological characterization of the gel point in sol–gel transition

2006 ◽  
Vol 352 (21-22) ◽  
pp. 2220-2225 ◽  
Author(s):  
E. Rudé Payró ◽  
J. Llorens Llacuna
Keyword(s):  
Sol Gel ◽  
Gel Point ◽  
Rheological Characterization ◽  
Sol Gel Transition ◽  
Gel Transition
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