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1. Stability of 3D printing using a mixture of pea protein and alginate: Precision and application of additive layer manufacturing simulation approach for stress distribution

Author:
Oyinloye, Timilehin Martins; Yoon, Won Byong
Source:
Journal of food engineering 2021 v.288 pp. 110127
ISSN:
0260-8774
Subject:
rheology,   etc   ; alginates; deformation; enthalpy; geometry; hardness; manufacturing; models; pea protein; storage modulus; texture; three-dimensional printing;     Show all 12 Subjects
Abstract:
... Printability of materials is the foundation for extrusion-based 3D printing, with residual stress being a major challenge towards the printing of complex geometry. In this report, the analysis of five blend ratios of alginate and pea protein solutions were investigated for an optimum 3D printing material mixture ratio by probing its rheology, thermal, and textural properties. The thermal (enthalpy ...
DOI:
10.1016/j.jfoodeng.2020.110127

2. Origin of Tank-Treading and Breathing Dynamics of Star Polymers in Shear Flow

Author:
Peláez, Raúl P.; Delgado-Buscalioni, Rafael
Source:
Macromolecules 2020 v.53 no.7 pp. 2634-2648
ISSN:
1520-5835
Subject:
rheology,   etc   ; breathing; hydrodynamics; polymers;     Show all 4 Subjects
Abstract:
... We investigate tank-treading and breathing dynamics of individual star molecules under shear flow and their relation with the macromolecule architecture. Tank-treading consists of the rotation of the arms of the star around a molecule’s center, whereas breathing consists in expansions and contractions of the whole molecule at a certain characteristic frequency. We derive scaling arguments for the ...
DOI:
10.1021/acs.macromol.9b01968

3. Improved nonlinear Burgers shear creep model based on the time-dependent shear strength for rock

Author:
Lin, Hang; Zhang, Xing; Cao, Rihong; Wen, Zhijie
Source:
Environmental earth sciences 2020 v.79 no.6 pp. 149
ISSN:
1866-6280
Subject:
rheology,   etc   ; models; shear strength;     Show all 3 Subjects
Abstract:
... Shear strength is an important mechanical index of rock. The adjustment and reorganization of rock structure can be reflected by the variation of shear strength. During rock rheology, the shear strength decreases with time due to rock damage. Therefore, from the point of difference of shear strength, the mechanical properties of rock can be effectively studied. In this paper, for the state of dire ...
DOI:
10.1007/s12665-020-8896-6

4. Biosurfactants: Formulations, properties, and applications

Author:
Drakontis, Constantina Eleni; Amin, Samiul
Source:
Current opinion in colloid & interface science 2020 v.48 pp. 77-90
ISSN:
1359-0294
Subject:
rheology,   etc   ; biochemical compounds; biosurfactants; microorganisms; physicochemical properties;     Show all 5 Subjects
Abstract:
... In this review, we attempt to give an overview on the recent progress made on biosurfactants, surface-active biomolecules produced by microorganisms, which are a sustainable alternative to synthetic surfactants. Different biosurfactants, their production techniques, and their physical and chemical properties are discussed. There is a focus on recent studies related to surface properties and rheolo ...
DOI:
10.1016/j.cocis.2020.03.013

5. Effect of high-pressure homogenization on rheological properties of citrus fiber

Author:
Su, Dianbin; Zhu, Xindi; Wang, Yong; Li, Dong; Wang, Lijun
Source:
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2020 v.127 pp. 109366
ISSN:
0023-6438
Subject:
rheology,   etc   ; Citrus; chemical interactions; homogenization; viscoelasticity; viscosity;     Show all 6 Subjects
Abstract:
... The effect of high-pressure homogenization (0, 90, and 160 MPa) on the nonlinear rheological of citrus fiber with different concentrations was studied via large amplitude oscillatory shear tests. The strain-stress data obtained from the tests were processed by the Fourier transform rheology and Chebyshev stress decomposition methods to investigate the viscoelastic behavior of citrus fiber in the n ...
DOI:
10.1016/j.lwt.2020.109366

6. Shear and extensional rheology of selected polysaccharides

Author:
Evageliou, Vasiliki
Source:
International journal of food science & technology 2020 v.55 no.5 pp. 1853-1861
ISSN:
0950-5423
Subject:
rheology,   etc   ; alginates; cellulose; galactomannans; rheometers; xanthan gum;     Show all 6 Subjects
Abstract:
... Rheology is used for the elucidation of the flow properties of polysaccharide solutions. For a given polysaccharide, both shear and extensional rheological experiments should be performed for the full characterisation of its flow properties. The provided information will facilitate the efficient exploitation of a polysaccharide in various applications. Although shear rheology is widely used in pol ...
DOI:
10.1111/ijfs.14545

7. Unexpected microphase transitions in flow towards nematic order of cellulose nanocrystals

Author:
Kádár, Roland; Fazilati, Mina; Nypelö, Tiina
Source:
Cellulose 2020 v.27 no.4 pp. 2003-2014
ISSN:
0969-0239
Subject:
rheology,   etc   ; cellulose; gels; liquid crystals; nanocrystals; nanoparticles;     Show all 6 Subjects
Abstract:
... Organization of nanoparticles is essential in order to control their light-matter interactions. We present cellulose nanocrystal suspension organization in flow towards a unidirectional state. Visualization of evolving polarization patterns of the cellulose nanocrystal suspensions is combined with steady and oscillatory shear rheology. Elucidation of the chiral nematic mesophase in a continuous pr ...
DOI:
10.1007/s10570-019-02888-x

8. Towards reliable optimization of metal powder—Lubricant mixing for high die filling performance: Exploring a rheology based approach

Author:
Nijikovsky, Boris; Aguirre Perales, Lydia; Brika, Salah Eddine; Brailovski, Vladimir
Source:
Powder technology 2020 v.362 pp. 168-176
ISSN:
0032-5910
Subject:
rheology,   etc   ; filling (processing); industry; lithium; lubricants; mixing;     Show all 6 Subjects
Abstract:
... A previously unreported approach to optimize the time of an industry scale mixing operation for best filling performance, while ensuring premix uniformity, is tested. Mixing a base metal powder with a lubricant facilitates compacting and ejecting of powder compacts. However, the quality of lubricant admixing directly influences premix flowability and, therefore, the die filling performance of the ...
DOI:
10.1016/j.powtec.2019.12.003

9. A novel framework for a rational, fully-automatised calibration routine for DEM models of cohesive powders

Author:
Orefice, Luca; Khinast, Johannes G.
Source:
Powder technology 2020 v.361 pp. 687-703
ISSN:
0032-5910
Subject:
rheology,   etc   ; data collection; laboratory experimentation; models; powders;     Show all 5 Subjects
Abstract:
... A new framework for calibration of DEM models of cohesive materials is presented. DEM simulations are a widespread numerical tool for modelling granular assemblies and related processes, but require careful calibration to give realistic predictive results. To this aim routine small-scale laboratory tests are used to investigate powders rheology while limiting resource investment, in conjunction wi ...
DOI:
10.1016/j.powtec.2019.11.054

10. A Critical Approach to Polymer Dynamics in Supramolecular Polymers

Author:
Golkaram, Milad; Loos, Katja
Source:
Macromolecules 2019 v.52 no.24 pp. 9427-9444
ISSN:
1520-5835
Subject:
rheology,   etc   ; mathematical models; polymers;     Show all 3 Subjects
Abstract:
... Over the past few years, the concurrent (1) development of polymer synthesis and (2) introduction of new mathematical models for polymer dynamics have evolved the classical framework for polymer dynamics once established by Doi–Edwards/de Gennes. Although the analysis of supramolecular polymer dynamics based on linear rheology has improved a lot recently, there are a large number of insecurities b ...
DOI:
10.1021/acs.macromol.9b02085
PubMed:
31894159
PubMed Central:
PMC6933822

11. Mechanochemical Feedback Loops in Development and Disease

Author:
Hannezo, Edouard; Heisenberg, Carl-Philipp
Source:
Cell 2019 v.178 no.1 pp. 12-25
ISSN:
0092-8674
Subject:
rheology,   etc   ; geometry; mechanochemistry;     Show all 3 Subjects
Abstract:
... There is increasing evidence that both mechanical and biochemical signals play important roles in development and disease. The development of complex organisms, in particular, has been proposed to rely on the feedback between mechanical and biochemical patterning events. This feedback occurs at the molecular level via mechanosensation but can also arise as an emergent property of the system at the ...
DOI:
10.1016/j.cell.2019.05.052

12. 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

13. Heterochromatin-Driven Nuclear Softening Protects the Genome against Mechanical Stress-Induced Damage

Author:
Nava, Michele M.; Miroshnikova, Yekaterina A.; Biggs, Leah C.; Whitefield, Daniel B.; Metge, Franziska; Boucas, Jorge; Vihinen, Helena; Jokitalo, Eija; Li, Xinping; García Arcos, Juan Manuel; Hoffmann, Bernd; Merkel, Rudolf; Niessen, Carien M.; Dahl, Kris Noel; Wickström, Sara A.
Source:
Cell 2020 v.181 no.4 pp. 800-817.e22
ISSN:
0092-8674
Subject:
rheology,   etc   ; DNA damage; deformation; energy; forces; genome; heterochromatin; homeostasis; mechanotransduction;     Show all 9 Subjects
Abstract:
... Tissue homeostasis requires maintenance of functional integrity under stress. A central source of stress is mechanical force that acts on cells, their nuclei, and chromatin, but how the genome is protected against mechanical stress is unclear. We show that mechanical stretch deforms the nucleus, which cells initially counteract via a calcium-dependent nuclear softening driven by loss of H3K9me3-ma ...
DOI:
10.1016/j.cell.2020.03.052

14. Molecular Dynamics Reveals a Dramatic Drop of the Friction Coefficient in Fast Flows of Polymer Melts

Author:
Ianniruberto, Giovanni; Marrucci, Giuseppe
Source:
Macromolecules 2020 v.53 no.7 pp. 2627-2633
ISSN:
1520-5835
Subject:
rheology,   etc   ; friction; melting; molecular dynamics; polymers; simulation models;     Show all 6 Subjects
Abstract:
... We here revisit existing results of Kremer–Grest molecular dynamics simulations of polymer melts that provide values of the friction coefficient ζ of the Kremer–Grest bead for the coarse-grained Fraenkel chain model, both at equilibrium, and in very fast uniaxial extensional flows. The Fraenkel chain model is chosen because it can guarantee chain inextensibility in the flow-induced fully aligned c ...
DOI:
10.1021/acs.macromol.0c00230

15. Exploring the gel phase of cationic glycylalanylglycine in ethanol/water. I. Rheology and microscopy studies

Author:
Thursch, Lavenia J.; DiGuiseppi, David; Lewis, Todd R.; Schweitzer-Stenner, Reinhard; Alvarez, Nicolas J.
Source:
Journal of colloid and interface science 2020 v.564 pp. 499-509
ISSN:
0021-9797
Subject:
rheology,   etc   ; ethanol; hydrogels; microscopy; microstructure; solubility; temperature; thermal stability; tripeptides;     Show all 9 Subjects
Abstract:
... The cationic tripeptide glycylalanylglycine (GAG) self-assembles into long, thick crystalline fibrils in an ethanol/water solution. At sufficiently high concentrations, the fibrils form a volume spanning hydrogel network. We report an extensive rheology and microscopy-based study regarding the self-assembly of GAG in ethanol/water solutions to understand the conditions for fibril formation as well ...
DOI:
10.1016/j.jcis.2019.10.029

16. Sticky-probe active microrheology: Part 2. The influence of attractions on non-Newtonian flow

Author:
Huang, Derek E.; Zia, Roseanna N.
Source:
Journal of colloid and interface science 2020 v.562 pp. 293-306
ISSN:
0021-9797
Subject:
rheology,   etc   ; Peclet number; advection; equations; microstructure; models; thermal energy; viscosity;     Show all 8 Subjects
Abstract:
... We derive a theoretical framework for the non-Newtonian viscosity of a sticky, attractive colloidal dispersion via active microrheology by modeling detailed microscopic attractive and Brownian forces between particles. Actively forcing a probe distorts the surrounding arrangement of particles from equilibrium; the degree of this distortion is characterized by the Péclet number, Pe≡Fext/(2kT/a), wh ...
DOI:
10.1016/j.jcis.2019.11.057

17. The effect of consistency on the shear rheology of aqueous suspensions of cellulose micro- and nanofibrils: a review

Author:
Koponen, Antti I.
Source:
Cellulose 2020 v.27 no.4 pp. 1879-1897
ISSN:
0969-0239
Subject:
rheology,   etc   ; cellulose; hydrodynamics; nanofibers; raw materials; rheological properties; uncertainty;     Show all 7 Subjects
Abstract:
... While the raw material type and the production method of cellulose micro- and nanofibrils (CMNFs) strongly affect the absolute values of the rheological parameters of their aqueous suspensions, the dependence of these parameters on consistency, c, is found to be uniform. The consistency index and yield stress of CMNF suspensions follow generally the scaling laws [Formula: see text] and [Formula: s ...
DOI:
10.1007/s10570-019-02908-w

18. Linear Viscoelasticity and Flow of Self-Assembled Vitrimers: The Case of a Polyethylene/Dioxaborolane System

Author:
Ricarte, Ralm G.; Tournilhac, François; Cloître, Michel; Leibler, Ludwik
Source:
Macromolecules 2020 v.53 no.5 pp. 1852-1866
ISSN:
1520-5835
Subject:
rheology,   etc   ; crosslinking; lubricants; melting; nanomaterials; polyethylene; separation; viscoelasticity;     Show all 8 Subjects
Abstract:
... For vitrimer systems obtained by dynamic cross-linking of polymer chains, incompatibility effects between the cross-links and polymer backbone can lead to microphase separation, resulting in a network made of cross-linked aggregates. Additionally, when there is a wide distribution of the number of cross-links per chain, macrophase separation can occur, mostly due to entropic effects. Here, we inve ...
DOI:
10.1021/acs.macromol.9b02415

19. Alignment of worm-like micelles at intermediate and high shear rates

Author:
Arenas-Gómez, Brisa; Garza, Cristina; Liu, Yun; Castillo, Rolando
Source:
Journal of colloid and interface science 2020 v.560 pp. 618-625
ISSN:
0021-9797
Subject:
rheology,   etc   ; geometry; micelles; neutron diffraction; sodium dodecyl sulfate; sulfonates; viscosity;     Show all 7 Subjects
Abstract:
... Rheology combined with Small-Angle Neutron Scattering (Rheo-SANS) can determine the local structural order in Worm-Like Micelle (WLM) solutions when the shear rate increases beyond the ending of the gradient shear banding. There, micelles are supposedly aligned, but viscosity reveals a transition regime as the shear rate increases.The mixture of 3-[dimethyl(tetradecyl)azaniumyl]propane-1-sulfonate ...
DOI:
10.1016/j.jcis.2019.10.052

20. Effect of bulk nanobubbles on the entrainment of kaolinite particles in flotation

Author:
Lei, Wang; Zhang, Ming; Zhang, Zhenxin; Zhan, Ning; Fan, Rong
Source:
Powder technology 2020 v.362 pp. 84-89
ISSN:
0032-5910
Subject:
rheology,   etc   ; blood platelets; clay; kaolinite; nanobubbles; tap water;     Show all 6 Subjects
Abstract:
... Understanding the entrainment behaviour of gangue minerals in the presence of nanobubbles is necessary for the application of nanobubble technology in froth flotation. In this study, the entrainment of kaolinite particles in flotation with nanobubble water produced by decompression, and tap water, was investigated. Compared to tap water, nanobubble water enhanced the entrainment of kaolinite parti ...
DOI:
10.1016/j.powtec.2019.12.015