{"title":"Influence of carboxymethyl cellulose solutions on rheological properties of Laponite dispersions","authors":"Ingri Julieth Mancilla Corzo, Jéssica Heline Lopes da Fonsêca, Marcos Akira d’Ávila","doi":"10.1007/s00397-023-01401-3","DOIUrl":"10.1007/s00397-023-01401-3","url":null,"abstract":"<div><p>Rheological analysis is an important tool to \u0000investigate the structural characteristics of materials widely used in the biomedical field, such as polymer solutions, colloids, and hydrogels. In this work, we studied the rheological properties of a colloidal system composed of carboxymethyl cellulose (CMC) and Laponite, both biocompatible materials. Rheological properties of CMC/Laponite aqueous dispersions are influenced by electrostatic interactions and hydrogen bonds between the silanol (Si–O) groups of Laponite and hydroxyl (-OH) of CMC. It was found that the effect of Laponite rheological behavior is strongly affected by CMC concentration, resulting in weak or strong gels. Adding CMC reinforces the blended network, increasing the storage <span>(left({G}^{^{prime}}right))</span> and loss <span>(left(G''right))</span> moduli, as well as viscosity. CMC/Laponite gels presented strong shear-thinning and thixotropy due to structural rearrangements when subjected to shear stresses. Moreover, time sweep tests revealed that adding CMC inhibited Laponite aging.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 7-8","pages":"393 - 404"},"PeriodicalIF":2.3,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4618787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rheologica ActaPub Date : 2023-06-12DOI: 10.1007/s00397-023-01399-8
Kimberlee S. M. Keithley, Jacob Palmerio, Hector A. Escobedo IV, Jordyn Bartlett, Henry Huang, Larry A. Villasmil, Michael Cromer
{"title":"Role of shear thinning in the flow of polymer solutions around a sharp bend","authors":"Kimberlee S. M. Keithley, Jacob Palmerio, Hector A. Escobedo IV, Jordyn Bartlett, Henry Huang, Larry A. Villasmil, Michael Cromer","doi":"10.1007/s00397-023-01399-8","DOIUrl":"10.1007/s00397-023-01399-8","url":null,"abstract":"<p>In flows with re-entrant corners, polymeric fluids can exhibit a recirculation region along the wall upstream from the corner. In general, the formation of these vortices is controlled by both the extensional and shear rheology of the material. More importantly, these regions can only form for sufficiently elastic fluids and are often called “lip vortices”. These elastic lip vortices have been observed in the flows of complex fluids in geometries with sharp bends. In this work, we characterize the roles played by elasticity and shear thinning in the formation of the lip vortices. Simulations of the Newtonian, Bird-Carreau, and Oldroyd-B models reveal that elasticity is a necessary element. A systematic study of the White-Metzner, finitely extensible non-linear elastic (FENE-P), Giesekus and Rolie-Poly models shows that the onset and size of the elastic lip vortex is governed by a combination of both the degree of shear thinning and the critical shear rate at which the thinning begins.</p><p>(left) Contour plots of velocity magnitude for the FENE-P model showing the decrease in size of the elastic lip vortex as maximum extensibility decreases. (right) Length of the elastic vortex as a function of a modified Carreau number showing a modelindependent effect of the degree and onset of shear thinning.</p>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 7-8","pages":"377 - 391"},"PeriodicalIF":2.3,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4498994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rheologica ActaPub Date : 2023-06-08DOI: 10.1007/s00397-023-01398-9
Rosalia Ferraro, Sergio Caserta
{"title":"SLE3S-water system: a linear rheological characterisation","authors":"Rosalia Ferraro, Sergio Caserta","doi":"10.1007/s00397-023-01398-9","DOIUrl":"10.1007/s00397-023-01398-9","url":null,"abstract":"<div><p>Surfactant-water mixtures display a complex rheological behaviour, with changes in parameters such as viscosity and moduli of several orders of magnitude as a consequence of phase changes, depending on their concentration and temperature: this criticism heavily affects different industrial processes. In our work, linear rheological behaviour of aqueous mixtures of a commercial anionic surfactant, sodium lauryl ether sulphate, is investigated in a range of temperature (30–60 °C) and surfactant concentration (20–72%wt) of technological relevance. Four phases with different texture are identified by polarised light microscopy: micellar, hexagonal, cubic and lamellar, all showing a shear-thinning behaviour. Rheological parameters of cubic phase show a net jump in a relatively narrow temperature range, suggesting a temperature-induced phase change. The systematic analysis of the rheological behaviour of this widely used surfactant system, reported here for the first time, can be of fundamental support for many industrial applications.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 7-8","pages":"365 - 375"},"PeriodicalIF":2.3,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-023-01398-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4661191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fracture in elongational flow of two low-density polyethylene melts","authors":"Leslie Poh, Qi Wu, Zhengbin Pan, Manfred H. Wagner, Esmaeil Narimissa","doi":"10.1007/s00397-023-01392-1","DOIUrl":"10.1007/s00397-023-01392-1","url":null,"abstract":"<div><p>Samples of two commercial low-density polyethylene melts were investigated with respect to their fracture behavior in controlled uniaxial extensional flow at constant strain rate in a filament stretching rheometer. In order to assess the possible influence of grain boundaries on fracture, the samples were prepared by three different types of pre-treatment: by compression molding of (1) virgin pellets used as received, (2) pellets homogenized in a twin-screw extruder, and (3) pellets that were milled into powder by cryogenic grinding under liquid nitrogen. The elongational stress growth data were analyzed by the Extended Hierarchical Multi-mode Molecular Stress Function (EHMMSF) model developed by Wagner et al. (Rheol. Acta 61, 281-298 (2022)) for long-chain branched (LCB) polymer melts. The EHMMSF model quantifies the elongational stress growth including the maximum in the elongational viscosity of LDPE melts based solely on the linear-viscoelastic relaxation spectrum and two nonlinear material parameters, the dilution modulus <i>G</i><sub><i>D</i></sub> and a characteristic stretch parameter <span>({overline{lambda}}_m)</span>. Within experimental accuracy, model predictions are in excellent agreement with the elongational stress growth data of the two LDPE melts, independent of the preparation method used. At sufficiently high strain rates, the fracture of the polymer filaments was observed and is in general accordance with the entropic fracture criterion implemented in the EHMMSF model. High-speed videography reveals that fracture is preceded by parabolic crack opening, which is characteristic for elastic fracture and which has been observed earlier in filament stretching of monodisperse polystyrene solutions. Here, for the first time, we demonstrate the appearance of a parabolic crack opening in the fracture process of polydisperse long-chain branched polyethylene melts.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 5-6","pages":"317 - 331"},"PeriodicalIF":2.3,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-023-01392-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4261874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rheologica ActaPub Date : 2023-06-02DOI: 10.1007/s00397-023-01394-z
Elisabeth Lemaire, Frédéric Blanc, Cyrille Claudet, Stany Gallier, Laurent Lobry, François Peters
{"title":"Rheology of non-Brownian suspensions: a rough contact story","authors":"Elisabeth Lemaire, Frédéric Blanc, Cyrille Claudet, Stany Gallier, Laurent Lobry, François Peters","doi":"10.1007/s00397-023-01394-z","DOIUrl":"10.1007/s00397-023-01394-z","url":null,"abstract":"<p>This paper presents a compilation of experimental and numerical results that both show that particles in a suspension under shear flow come into contact through surface roughness. Accounting for those frictional contacts captures well the measured viscosity values as well as the shear-thinning observed in many concentrated non-Brownian suspensions. More specifically, the precise analysis of the asymmetric microstructure of the suspension clearly shows the role played by surface asperities in the interparticle contact. Numerical simulation results are then recalled and show the major impact of solid friction between particles on the viscosity. It is then pointed out that shear reversal experiments are a good way to assess this impact and to deduce useful information on the frictional properties of contacts. Finally, when considering together contacts via asperities and the close link between friction and rheology, a natural explanation for the shear-thinning observed in most suspensions can be proposed. According to it, as the shear stress increases, the friction coefficient decreases which leads to a viscosity decrease. This scenario first implemented in numerical simulations is verified experimentally through coupled AFM and rheometry measurements.</p><p>The asymmetry of the shear-induced microstructure of non-Brownian and non-colloidal suspensions reflects the presence of solid contacts between particles, enabled by the surface asperities of the particles. The peculiar characteristics of these asperity contacts open the way to explain the shear-thinning observed for many suspensions by a decrease in the friction coefficient with increasing shear stress. </p>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 5-6","pages":"253 - 268"},"PeriodicalIF":2.3,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4091027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rheologica ActaPub Date : 2023-05-15DOI: 10.1007/s00397-023-01395-y
Abdulwahab S. Almusallam, Isameldeen E. Daffallah, Jiwan S. Sidhu
{"title":"Large amplitude oscillatory shear of doughs, based on different flours, modeled using the fractional K-BKZ framework","authors":"Abdulwahab S. Almusallam, Isameldeen E. Daffallah, Jiwan S. Sidhu","doi":"10.1007/s00397-023-01395-y","DOIUrl":"10.1007/s00397-023-01395-y","url":null,"abstract":"<div><p>In this work, we investigate the large amplitude oscillatory shear (LAOS) behavior of white-wheat, wholegrain-wheat and chickpea flour doughs experimentally and theoretically. In order to accurately model the LAOS behavior of those doughs, it was important to study their linear viscoelastic as well as stress relaxation behaviors. We analyzed the linear viscoelastic behavior theoretically through the single spring-pot model, the fractional Maxwell model (FMM) and the fractional Kelvin-Voigt model. We found that the FMM is best suited to describe the LVE of the doughs we investigated. The damping function form was chosen based on stress relaxation and strain sweep experiments. We found that the Soskey-Winter (SW) equation is suitable for accurately describing the damping behavior of doughs. The LAOS experimental results were obtained at a set of strain amplitude and frequency values to build the Lissajous-Bowditch curves in Pipkin space. We modeled the LAOS stress response using the Kay-Bernstein Kearsley and Zapas (K-BKZ) model coupled with the FMM and SW models. The SW parameters were optimized for each dough by fitting the LAOS Lissajous-Bowditch curves in Pipkin space. The obtained fits to LAOS stress response were very good and illustrate that the FMM-SW-K-BKZ model provides an excellent description of the LAOS behavior of the different variety of doughs examined in this work. Moreover, the study shows that LAOS Lissajous-Bowditch curves provide characteristically different shapes for wheat and chickpea flour doughs.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 5-6","pages":"303 - 316"},"PeriodicalIF":2.3,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4625573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Thixotropic yielding behavior of MLPS colloidal suspension","authors":"Yixuan Hou, Zhao Jin, Xinzhe Que, Dongdong Yuan, Yonggang Lin, Mingquan Yu, Yongchao Zhou, Yiping Zhang","doi":"10.1007/s00397-023-01396-x","DOIUrl":"10.1007/s00397-023-01396-x","url":null,"abstract":"<div><p>The colloidal suspension of magnesium lithium phyllosilicate (MLPS), a synthetic clay that shows complex rheological behaviors, is a promising analogue for natural soft clay. The significant thixotropy of MLPS colloidal suspension controls the solid-liquid transition and affects the application of the material. In this work, the thixotropic yielding behaviors of MLPS with concentrations of 3, 4, 5, and 6 wt% were investigated utilizing rheological testing methods. The static and dynamic yield stresses measured by different methods were analyzed and compared. The flow curves of shear rate ramp tests show inapplicability in determining yield stresses due to shear banding, while the yield stresses obtained by shear stress ramp and oscillatory shear tests exhibit satisfactory consistency. Coupled with a structural kinetics equation, a thixotropic visco-plastic model incorporating static and dynamic yield stress was established to describe the thixotropic yielding behavior of MLPS suspension. The model parameters were conveniently determined via shear ramp tests and step change in shear rate tests with good fitting performance, and the concentration-dependent characteristics of the parameters were also discussed. Based on model prediction and experimental results, the interactions between shear stress, shear rate, and microstructure were analyzed in steady and transient states.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 5-6","pages":"285 - 302"},"PeriodicalIF":2.3,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-023-01396-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4353645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rheologica ActaPub Date : 2023-04-05DOI: 10.1007/s00397-023-01393-0
Valerian Hirschberg, Max G. Schußmann, Marie-Christin Röpert, Manfred Wilhelm, Manfred H. Wagner
{"title":"Modeling elongational viscosity and brittle fracture of 10 polystyrene Pom-Poms by the hierarchical molecular stress function model","authors":"Valerian Hirschberg, Max G. Schußmann, Marie-Christin Röpert, Manfred Wilhelm, Manfred H. Wagner","doi":"10.1007/s00397-023-01393-0","DOIUrl":"10.1007/s00397-023-01393-0","url":null,"abstract":"<div><p>A Pom-Pom polymer with <i>q</i><sub><i>a</i></sub> side chains of molecular weight <i>M</i><sub><i>w,a</i></sub> at both ends of a backbone chain of molecular weight <i>M</i><sub><i>w,b</i></sub> is the simplest branched polymer topology. Ten nearly monodisperse polystyrene Pom-Pom systems synthesized via an optimized anionic polymerization and a grafting-onto method with <i>M</i><sub><i>w,b</i></sub> of 100 to 400 kg/mol, <i>M</i><sub><i>w,a</i></sub> of 9 to 50 kg/mol, and <i>q</i><sub><i>a</i></sub> between 9 and 22 are considered. We analyze the elongational rheology of the Pom-Poms by use of the hierarchical multi-mode molecular stress function (HMMSF) model, which has been shown to predict the elongational viscosity of linear and long-chain branched (LCB) polymer melts based exclusively on the linear-viscoelastic characterization and a single material parameter, the so-called dilution modulus <i>G</i><sub><i>D</i></sub>. For the Pom-Poms considered here, we show that <i>G</i><sub><i>D</i></sub> can be identified with the plateau modulus <span>({G}_{N}^{0}={G}_{D})</span>, and the modeling of the elongational viscosity of the Pom-Poms does therefore not require any fitting parameter but is fully determined by the linear-viscoelastic characterization of the melts. Due to the high strain hardening of the Pom-Poms, brittle fracture is observed at higher strains and strain rates, which is well described by the entropic fracture criterion.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 5-6","pages":"269 - 283"},"PeriodicalIF":2.3,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-023-01393-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4529650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rheologica ActaPub Date : 2023-03-22DOI: 10.1007/s00397-023-01389-w
Elton L. Correia, H. Henning Winter, Sepideh Razavi
{"title":"Two-dimensional glass transition–like behavior of Janus particle–laden interface","authors":"Elton L. Correia, H. Henning Winter, Sepideh Razavi","doi":"10.1007/s00397-023-01389-w","DOIUrl":"10.1007/s00397-023-01389-w","url":null,"abstract":"<div><p>Understanding the interactive behavior of Janus particles (JPs) is a growing field of research. The enhancement in binding energy, in comparison to homogenous particles, and the dual characteristic of JPs open up new possibilities for novel applications. In many such applications, interfacial materials become subjected to flows that produce dilational and shear stresses. Therefore, it is important to understand the impact that the Janus character brings to interfaces. In this work, we study the microstructure of two-dimensional (2D) JP monolayers formed at the air–water interface and examine the shear viscoelasticity with an interface rheometer that was adapted for in situ surface pressure control via a Langmuir trough. We extend concepts from bulk rheology to data obtained from interfacial rheology as a tool to understand and predict the monolayer’s viscoelastic behavior. Finally, by calculating the time relaxation spectrum from the measured 2D dynamic moduli, we conclude that a phenomenon similar to glass transition is taking place by analogy.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 4","pages":"239 - 251"},"PeriodicalIF":2.3,"publicationDate":"2023-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-023-01389-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4867281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rheologica ActaPub Date : 2023-03-20DOI: 10.1007/s00397-023-01391-2
Xiaoyu Cui, Hongjian Wang, Lin Ye, Kunkun Fu
{"title":"Numerical simulation of shear jamming in a shear thickening fluid under impact","authors":"Xiaoyu Cui, Hongjian Wang, Lin Ye, Kunkun Fu","doi":"10.1007/s00397-023-01391-2","DOIUrl":"10.1007/s00397-023-01391-2","url":null,"abstract":"<div><p>Shear thickening fluids (STFs) exhibit a liquid–solid-like transition under impact because of the formation and evolution of shear jamming in the STFs. This study aims to develop a computational fluid dynamics (CFD) model to simulate the shear jamming formation and evolution in a concentrated STF under impact for the optimum design of the STF applications. The STF was defined with a strain rate–dependent viscosity and compressibility. In the CFD model, the interface between air and STF was modelled by the volume of fluid method to solve the multiphase flow problem. In addition, the impact penetration process of an impactor was reproduced by the change of the fluid domain shape with a dynamic mesh method. The shear jamming was demonstrated clearly by a high strain–rate region caused by the impact. The numerical results were comparable to the experimental observations of shear jamming evolution using a high-speed camera. Furthermore, the numerical results showed that the effect of the STF’s dimensions (depth and diameter) on the expansion rate of the shear jamming was insignificant.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"62 4","pages":"225 - 238"},"PeriodicalIF":2.3,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4799623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}