Rheological characterization of mammalian lung mucus

RSC Advances ◽  
2014 ◽  
Vol 4 (66) ◽  
pp. 34780-34783 ◽  
Author(s):  
Erick S. Vasquez ◽  
Jacquelyn Bowser ◽  
Cyprianna Swiderski ◽  
Keisha B. Walters ◽  
Santanu Kundu
Keyword(s):  
Strain Softening ◽  
Large Strain ◽  
Rheological Characterization ◽  
Non Linear ◽  
Linear Viscoelastic ◽  
Mammalian Lung ◽  
Complex Fluid

Mammalian lung mucus is a complex fluid that displays non-linear viscoelastic responses, strain-stiffening at low-strain and strain-softening at large strain values.

The rheologically-complex fluid beauty of nail lacquer formulations

Soft Matter ◽  
2021 ◽  
Author(s):  
Leidy Nallely Jimenez ◽  
Carina D. V. Martínez Narváez ◽  
Chenxian Xu ◽  
Samantha Bacchi ◽  
Vivek Sharma
Keyword(s):  
Fluid Mechanics ◽  
Rheological Characterization ◽  
Nail Lacquer ◽  
Complex Fluid

We focus on conceptual and experimental challenges underlying the rheological characterization of commercial nail lacquer formulations, and the fluid mechanics quests relevant to the problem of painting nails or getting them painted.

S0501-1-4 Characterization of non-linear viscoelastic Bingham fluid flow in tube

2010 ◽  
Vol 2010.2 (0) ◽  
pp. 43-44
Author(s):  
Masato Nakamura ◽  
Hiroshi Yamaguchi ◽  
Munehiro Maeda
Keyword(s):  
Fluid Flow ◽  
Bingham Fluid ◽  
Non Linear ◽  
Linear Viscoelastic

scholarly journals Analysis of the complex rheological properties of highly concentrated proteins with a closed cavity rheometer

2020 ◽  
Vol 30 (1) ◽  
pp. 64-76 ◽  
Author(s):  
Patrick Wittek ◽  
Nicole Zeiler ◽  
Heike P. Karbstein ◽  
M. Azad Emin
Keyword(s):  
Rheological Properties ◽  
Protein A ◽  
Linear Range ◽  
Material Behavior ◽  
Elastic Behavior ◽  
Process Conditions ◽  
Rheological Characterization ◽  
Closed Cavity ◽  
Non Linear ◽  
Linear Viscoelastic

AbstractHighly concentrated biopolymers are used in food extrusion processing. It is well known that rheo-logical properties of biopolymers influence considerably both process conditions and product properties. Therefore, characterization of rheological properties under extrusion-relevant conditions is crucial to process and product design. Since conventional rheological methods are still lacking for this purpose, a novel approach is presented. A closed cavity rheometer known in the rubber industry was used to systematically characterize a highly concentrated soy protein, a very relevant protein in extruded meat analogues. Rheological properties were first determined and discussed in the linear viscoelastic range (SAOS). Rheo-logical analysis was then carried out in the non-linear viscoelastic range (LAOS), as high deformations in extrusion demand for measurements at process-relevant high strains. The protein showed gel behavior in the linear range, while liquid behavior was observed in the nonlinear range. An expected increase in elasticity through addition of methylcellulose was detected. The measurements in the non-linear range reveal significant changes of material behavior with increasing strain. As another tool for rheological characterization, a stress relaxation test was carried out which confirmed the increase of elastic behavior after methylcellulose addition.

Study on Rheological Characterization of Uncured Natural Rubber with Different Initial Moisture Contents Dried by Microwave

2014 ◽  
Vol 998-999 ◽  
pp. 383-386
Author(s):  
Fu Quan Zhang ◽  
Yong Zhou Wang ◽  
Mei Chen ◽  
Mao Fang Huang ◽  
Ri Zhong Zeng
Keyword(s):  
Natural Rubber ◽  
Viscoelastic Behavior ◽  
Sweep Frequency ◽  
Rheological Characterization ◽  
Moisture Contents ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Strain Sweep ◽  
Viscous Torque

In this work, the rheological behavior of uncured natural rubber with different initial moisture contents dried by microwave was studied using RPA under frequency sweep and strain sweep modes. It can be seen from the results that the variation trend of viscous torque S`` versus sweep frequency kept with the trend of elastic torque S` versus sweep frequency. Moreover, the viscous torque S`` values were lower than those for elastic torque S`, a good linear relation curve was obtained by plotting elastic torque S` versus sweep frequency. The curve of storage shear modulus G` versus sweep strain presented a linear relationship, showed a linear viscoelastic behavior of uncured natural rubber with different initial moisture contents. This may be explained by the degradation of molecular chains of natural rubber and the van der waals forces between them.

Characterization of non-linear viscoelastic rheological properties of bioelastomers

1982 ◽  
Vol 15 (10) ◽  
pp. 804
Author(s):  
D. Trevisan ◽  
D. Geiger ◽  
P. Flaud ◽  
M. Bercovy ◽  
D. Goutallier ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Non Linear ◽  
Linear Viscoelastic

scholarly journals Milligram Size Rheology of Molten Polymers

Fluids ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 28 ◽  
Author(s):  
Salvatore Costanzo ◽  
Rossana Pasquino ◽  
Jörg Läuger ◽  
Nino Grizzuti
Keyword(s):  
Good Accuracy ◽  
Rheological Characterization ◽  
Rheological Measurements ◽  
Start Up ◽  
Molten Polymers ◽  
Linear Viscoelastic ◽  
Linear And Nonlinear ◽  
Living Organisms ◽  
Nonlinear Regimes

During laboratory practice, it is often necessary to perform rheological measurements with small specimens, mainly due to the limited availability of the investigated systems. Such a restriction occurs, for example, because the laboratory synthesis of new materials is performed on small scales, or can concern biological samples that are notoriously difficult to be extracted from living organisms. A complete rheological characterization of a viscoelastic material involves both linear and nonlinear measurements. The latter are more challenging and generally require more mass, as flow instabilities often cause material losses during the experiments. In such situations, it is crucial to perform rheological tests carefully in order to avoid experimental artifacts caused by the use of small geometries. In this paper, we indicate the drawbacks of performing linear and nonlinear rheological measurements with very small amounts of samples, and by using a well-characterized linear polystyrene, we attempt to address the challenge of obtaining reliable measurements with sample masses of the order of a milligram, in both linear and nonlinear regimes. We demonstrate that, when suitable protocols and careful running conditions are chosen, linear viscoelastic mastercurves can be obtained with good accuracy and reproducibility, working with plates as small as 3 mm in diameter and sample thickness of less than 0.2 mm. This is equivalent to polymer masses of less than 2 mg. We show also that the nonlinear start-up shear fingerprint of polymer melts can be reliably obtained with samples as small as 10 mg.

Non-linear Viscoelastic Model for Behaviour Characterization of Temporomandibular Joint Discs

2011 ◽  
Vol 51 (8) ◽  
pp. 1435-1440 ◽  
Author(s):  
M. J. Lamela ◽  
Y. Prado ◽  
P. Fernández ◽  
A. Fernández-Canteli ◽  
E. Tanaka
Keyword(s):  
Temporomandibular Joint ◽  
Viscoelastic Model ◽  
Non Linear ◽  
Linear Viscoelastic ◽  
Joint Discs ◽  
Linear Viscoelastic Model
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