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1. Shear-Induced Transformation of Polymer-Rich Lamellar Phases to Micron-Sized Vesicles

Author:
Großkopf, Sören; Tiersch, Brigitte; Koetz, Joachim; Mix, Andreas; Hellweg, Thomas
Source:
Langmuir 2019 v.35 no.8 pp. 3048-3057
ISSN:
1520-5827
Subject:
rheology,   etc   ; microscopy; surfactants;     Show all 3 Subjects
Abstract:
... In the present work, we study the shear-induced transformation of polymer-rich lamellar phases into vesicles. The evolution of vesicle size is studied by different scattering techniques, rheology, and microscopy methods. The lamellar phase found in the system D₂O/o-xylene/Pluronic PE9400/C₈TAB can be fully transformed to multilamellar vesicles (MLVs) by applying shear. The size of the MLVs is prop ...
DOI:
10.1021/acs.langmuir.8b02786

2. Microrheology with optical tweezers: peaks & troughs

Author:
Tassieri, Manlio
Source:
Current opinion in colloid & interface science 2019 v.43 pp. 39-51
ISSN:
1359-0294
Subject:
rheology,   etc   ; optical traps; sensors (equipment);     Show all 3 Subjects
Abstract:
... Since their first appearance in the 1970s, optical tweezers have been successfully exploited for a variety of applications throughout the natural sciences, revolutionising the field of microsensing. However, when adopted for microrheology studies, there exist some peaks and troughs on their modus operandi and data analysis that I wish to address and possibly iron out, providing a guide to future r ...
DOI:
10.1016/j.cocis.2019.02.006

3. Effect of vibrations on granular material flows down an inclined plane using DEM simulations

Author:
Gaudel, Naïma; Kiesgen De Richter, Sébastien
Source:
Powder technology 2019 v.346 pp. 256-264
ISSN:
0032-5910
Subject:
rheology,   etc   ; powders; temperature profiles; vibration;     Show all 4 Subjects
Abstract:
... The influence of transverse mechanical vibrations on dense flows of granular material down inclines with a rough bed is analyzed using 3D DEM simulations and compared with experimental results. The vibrations make appear two distinct behaviors: a gravity-driven regime and a vibration-driven regime. In the gravity-driven regime, our results are consistent with previous studies from the literature. ...
DOI:
10.1016/j.powtec.2019.01.080

4. Numerical simulation of debris-flow behavior based on the SPH method incorporating the Herschel-Bulkley-Papanastasiou rheology model

Author:
Han, Zheng; Su, Bin; Li, Yange; Wang, Wei; Wang, Weidong; Huang, Jianling; Chen, Guangqi
Source:
Engineering geology 2019 v.255 pp. 26-36
ISSN:
0013-7952
Subject:
rheology,   etc   ; case studies; hydrodynamics; mathematical models; Japan;     Show all 5 Subjects
Abstract:
... A rational rheology model is critical for the numerical simulation of debris-flow behavior. The Bingham model commonly used in many current studies has failed to simulate the shear thickening and thinning phenomenon in experiments. We report an alternative solution by incorporating the Herschel-Bulkley-Papanastasiou (HBP) model with the smoothed particle hydrodynamic (SPH) method. The SPH simulati ...
DOI:
10.1016/j.enggeo.2019.04.013

5. Instrumented test tube for rapid rheological behaviour of liquids estimation

Author:
Mograne, Med Abderrahmane; Ferrandis, Jean-Yves; Laux, Didier
Source:
Journal of food engineering 2019 v.247 pp. 126-129
ISSN:
0260-8774
Subject:
rheology,   etc   ; elasticity (mechanics); shear stress; ultrasonics; viscosity;     Show all 5 Subjects
Abstract:
... For very small shear rates, many liquids are Newtonian and one of the simplest method to evaluate their viscosity is the so-called “falling-ball method”. Classically, a ball falling in a large tube, is optically observed and evaluation of its fall time enables simple deduction of the velocity, leading to shear viscosity estimation. In this communication, the tracking of a falling ball was made in ...
DOI:
10.1016/j.jfoodeng.2018.12.007

6. Shear and extensional rheological characterization of thickened fluid for dysphagia management

Author:
Hadde, E.K.; Chen, J.
Source:
Journal of food engineering 2019 v.245 pp. 18-23
ISSN:
0260-8774
Subject:
rheology,   etc   ; cohesion; deformation; deglutition; dysphagia; thickeners; viscosity;     Show all 7 Subjects
Abstract:
... Thickened fluids are used in the medical management of individuals who suffer from swallowing difficulties (known as dysphagia). Recent studies show that understanding the rheological properties of thickened fluids is advantageous in designing better-controlled fluids. Whilst the rheological behavior of thickened fluids in shear deformation has been studied by several authors, studies on their ext ...
DOI:
10.1016/j.jfoodeng.2018.10.007

7. Dynamic Surface Properties of Fullerenol Solutions

Author:
Noskov, Boris A.; Timoshen, Kirill A.; Akentiev, Alexander V.; Chirkov, Nikolay S.; Dubovsky, Ignat M.; Lebedev, Vasyli T.; Lin, Shi-Yow; Loglio, Giuseppe; Miller, Reinhard; Sedov, Victor P.; Borisenkova, Alina A.
Source:
Langmuir 2019 v.35 no.10 pp. 3773-3779
ISSN:
1520-5827
Subject:
rheology,   etc   ; adsorption; dispersions; moieties; nanoparticles; surfactants;     Show all 6 Subjects
Abstract:
... Application of dilational surface rheology, surface tensiometry, ellipsometry, Brewster angle, and transmission electron and atomic force microscopies allowed the estimation of the structure of the adsorption layer of a fullerenol with a large number of hydroxyl groups, C₆₀(OH)X (X = 30 ± 2). The surface properties of fullerenol solutions proved to be similar to the properties of dispersions of so ...
DOI:
10.1021/acs.langmuir.8b04152

8. Determining the Dilution Exponent for Entangled 1,4-Polybutadienes Using Blends of Near-Monodisperse Star with Unentangled, Low Molecular Weight Linear Polymers

Author:
Hall, Ryan; Kang, Beom-Goo; Lee, Sanghoon; Chang, Taihyun; Venerus, David C.; Hadjichristidis, Nikos; Mays, Jimmy; Larson, Ronald G.
Source:
Macromolecules 2019 v.52 no.4 pp. 1757-1771
ISSN:
1520-5835
Subject:
rheology,   etc   ; melting; models; molecular weight; polymers;     Show all 5 Subjects
Abstract:
... We determine experimentally the “dilution exponent” α for entangled polymers from the scaling of terminal crossover frequency with entanglement density from the linear rheology of three 1,4-polybutadiene star polymers that are blended with low-molecular-weight, unentangled linear 1,4-polybutadiene at various star volume fractions, ϕₛ. Assuming that the rheology of monodisperse stars depends solely ...
DOI:
10.1021/acs.macromol.8b01828

9. Influence of topographic data uncertainties and model resolution on the numerical simulation of lava flows

Author:
Bilotta, Giuseppe; Cappello, Annalisa; Hérault, Alexis; Del Negro, Ciro
Source:
Environmental modelling & software 2019 v.112 pp. 1-15
ISSN:
1364-8152
Subject:
rheology,   etc   ; lava; simulation models; topography; uncertainty;     Show all 5 Subjects
Abstract:
... The emplacement of lava flows is mainly controlled by the topography, which is an essential input parameter to all numerical simulation models. The sensitivity of these models to the uncertainties in topographic data, and the consequent error propagation, may have non-negligible effects on the accuracy and reliability of the modelling of the lava flow hazard. Quantified analysis of the model sensi ...
DOI:
10.1016/j.envsoft.2018.11.001

10. Shear banding in semidilute entangled polymer solutions

Author:
Germann, Natalie
Source:
Current opinion in colloid & interface science 2019 v.39 pp. 1-10
ISSN:
1359-0294
Subject:
rheology,   etc   ; mathematical models; polymers; rheological properties;     Show all 4 Subjects
Abstract:
... Shear banding in semidilute polymer solutions and other soft materials is one of the most intensely debated topics in current rheology. By means of rheo-optical experiments, physical modeling, and numerical simulations, researchers have started to develop a more thorough understanding of this flow instability within the past few years. Nevertheless, much effort is still required to identify the ex ...
DOI:
10.1016/j.cocis.2018.12.006

11. Explaining food texture through rheology

Author:
Joyner (Melito), Helen S
Source:
Current opinion in food science 2018 v.21 pp. 7-14
ISSN:
2214-7993
Subject:
rheology,   etc   ; food science; texture;     Show all 3 Subjects
Abstract:
... Building food rheology–sensory relationships allows food scientists to predict textural attributes from instrumental measurements. However, these relationships can be difficult to determine due to the complex composition, structure of the food, as well as the difficulties in accounting for the changes to the food during oral processing. Novel rheological and sensorial analyses are working toward a ...
DOI:
10.1016/j.cofs.2018.04.003

12. Shear rheology of fluid interfaces: Closing the gap between macro- and micro-rheology

Author:
Guzmán, Eduardo; Tajuelo, Javier; Pastor, Juan Manuel; Rubio, Miguel Ángel; Ortega, Francisco; Rubio, Ramón G.
Source:
Current opinion in colloid & interface science 2018
ISSN:
1359-0294
Subject:
rheology,   etc   ; hydrodynamics; viscosity;     Show all 3 Subjects
Abstract:
... For many years the determination of the shear viscosity of interfacial layers has been source of strong controversy. This is mainly because different techniques provided different values of such parameter, which leads in many cases to a puzzling interpretation of the experimental results. One possible explanation of this is the non-correct analysis of the hydrodynamic conditions of the measurement ...
DOI:
10.1016/j.cocis.2018.05.004

13. Rheology of common uncharged exopolysaccharides for food applications

Author:
Hundschell, Christoph Simon; Wagemans, Anja Maria
Source:
Current opinion in food science 2019 v.27 pp. 1-7
ISSN:
2214-7993
Subject:
rheology,   etc   ; additives; curdlan; dextran; exopolysaccharides; health promotion; hydrocolloids; levan; viscoelasticity;     Show all 9 Subjects
Abstract:
... Uncharged exopolysaccharides (EPS) are a promising source of functional hydrocolloids with unique techno-functional properties and health promoting effects. EPS can be used as additives or formed in situ in food to enhance the rheological properties. This article gives a review of the rheological characterisation of EPS in terms of macromolecular conformation and viscoelastic behaviour. The proper ...
DOI:
10.1016/j.cofs.2019.02.011

14. Investigating the shear rheology of molten instant coffee at elevated pressures using the Cambridge multipass rheometer

Author:
Sargent, Michael J.; Hallmark, B.
Source:
Food and bioproducts processing 2019 v.115 pp. 17-25
ISSN:
0960-3085
Subject:
rheology,   etc   ; air; instant coffee; melting; models; rheometers; temperature; water content;     Show all 8 Subjects
Abstract:
... The processing of instant coffee may involve pumping the material in a melt phase through operations at elevated pressures. The shear rheology of this material was investigated using the Cambridge multipass rheometer, which allows for shear rheometric testing under conditions of independently controlled temperature and pressure. In this work the back pressure was set to dissolve any air that was p ...
DOI:
10.1016/j.fbp.2019.02.008

15. Carbonaceous micro-filler for cement: Effect of particle size and dosage of biochar on fresh and hardened properties of cement mortar

Author:
Gupta, Souradeep; Kua, Harn Wei
Source:
The Science of the total environment 2019 v.662 pp. 952-962
ISSN:
0048-9697
Subject:
rheology,   etc   ; absorption; biochar; cement; particle size; permeability; quartz; viscosity;     Show all 8 Subjects
Abstract:
... This study explores influence of biochar particle size and surface morphology on rheology, strength development and permeability of cement mortar, under moist and dry curing condition. Experimental results show that the flowability and viscosity of cement paste is more affected by macro-porous coarser (or ‘normal’) biochar particles of size 2–100 μm (NBC) compared to fine (or ‘ground’ biochar), wh ...
DOI:
10.1016/j.scitotenv.2019.01.269

16. Colloidal dynamics and elasticity of dense wax particle suspensions over a wide range of volume fractions when tuning the softness by temperature.

Author:
Yoon, Jiwon; Scheffold, Frank; Ahn, Kyung Hyun
Source:
Colloids and surfaces 2019
ISSN:
0927-7757
Subject:
rheology,   etc   ; droplets; emulsions; hardness; liquids; rheometry; spectroscopy; storage modulus; temperature;     Show all 9 Subjects
Abstract:
... We report on the colloidal dynamics and rheology of liquid droplet emulsions and solid particle suspensions over a wide range of volume fractions. Diffusing wave spectroscopy and rheometry were utilized to study the micro/macroscale properties of 1-eicosene wax particles dispersed in water. By changing the temperature, the wax droplets change their properties from soft to hard or vice versa, which ...
DOI:
10.1016/j.colsurfa.2019.04.030

17. Interaction of process parameters and material properties with regard to prepreg tack in automated lay-up and draping processes

Author:
Budelmann, D.; Detampel, H.; Schmidt, C.; Meiners, D.
Source:
Composites 2019 v.117 pp. 308-316
ISSN:
1359-835X
Subject:
rheology,   etc   ; automation; carbon fibers; composite materials; epoxides; rheometers; temperature;     Show all 7 Subjects
Abstract:
... Selectively adjusting the tackiness of epoxy pre-impregnated carbon fibers is considered mandatory in terms of process stability of automated lay-up and draping. This experimental study investigates the influence of crucial process and material parameters such as temperature, compaction force, debonding rate and ageing on prepreg tack using a rheometer as a test apparatus. Accompanying material ch ...
DOI:
10.1016/j.compositesa.2018.12.001

18. Rheological investigations of beta glucan functionality: Interactions with mucin

Author:
Yuan, Bo; Ritzoulis, Christos; Chen, Jianshe
Source:
Food hydrocolloids 2019 v.87 pp. 180-186
ISSN:
0268-005X
Subject:
rheology,   etc   ; beta-glucans; digestion; gastric juice; hydrocolloids; mucins; viscosity;     Show all 7 Subjects
Abstract:
... The shear and extensional rheology of β-glucan and mucin mixtures have been studied as to probe the functionality-related thickening effects of consumed β-glucan during food digestion. Mucins, the main viscosity-inducing components of oral and gastrointestinal fluids, can increase the shear viscosity of β-glucan solutions, e.g. when 3% mucin is added into 1% β-glucan, the shear viscosity increases ...
DOI:
10.1016/j.foodhyd.2018.07.049

19. Effect of Finite Extensibility on Nonlinear Extensional Rheology of Polymer Melts

Author:
Morelly, Samantha L.; Palmese, Luisa; Watanabe, Hiroshi; Alvarez, Nicolas J.
Source:
Macromolecules 2019 v.52 no.3 pp. 915-922
ISSN:
1520-5835
Subject:
rheology,   etc   ; deformation; extensibility; friction; hydrodynamics; melting; polymethylmethacrylate; polystyrenes; viscoelasticity;     Show all 9 Subjects
Abstract:
... We recently showed that two systems have the same nonlinear flow dynamics if they have (1) the same number of entanglements, Z, (2) the same number of Kuhn segments between entanglements, Nₑ, and (3) a single monomeric friction reduction between all species. Because differences in polymer chemistry result in different values of (1)–(3), these results show that the likelihood of two melts having th ...
DOI:
10.1021/acs.macromol.8b02319

20. Rheology of a colloidal suspension of carbon nanotube particles in a water-based drilling fluid

Author:
Anoop, Kanjirakat; Sadr, Reza; Yrac, Rommel; Amani, Mahmood
Source:
Powder technology 2019 v.342 pp. 585-593
ISSN:
0032-5910
Subject:
rheology,   etc   ; carbon nanotubes; colloids; drilling; nanoparticles; powders; temperature; viscosity;     Show all 8 Subjects
Abstract:
... High-pressure and high-temperature rheology of a nanomud suspension is studied. The nanomud is prepared by dispersing a water-based drilling mud suspension with multi-walled carbon nanotubes (MWCNT). Effect of nanoparticle concentration, shear rate, pressure, and temperature are investigated. The pressure and temperature are independently varied from ambient conditions to 170 MPa and 180 °C respec ...
DOI:
10.1016/j.powtec.2018.10.016