Rheologica Acta最新文献

{"title":"Investigating the interactions between Carbopol® and zinc particles within the context of a zinc-air redox flow batteries application","authors":"Diego Milian,&nbsp;Yahya Rharbi,&nbsp;Nadia El Kissi","doi":"10.1007/s00397-024-01464-w","DOIUrl":"10.1007/s00397-024-01464-w","url":null,"abstract":"<div><p>This research investigates the interactions between Carbopol® and zinc microparticles and their role in the stabilization of zinc within the framework of zinc slurry–air redox flow batteries (Zn-air RFBs). The study explores the potential of yield stress fluids, particularly PAA (Carbopol®) microgels, as stabilizers for zinc particles during battery operation, and regarding sedimentation in particular. Two effects that can limit the effectiveness of PAA yield stress in stabilizing the suspension are examined in this study. First is the ionic strength and pH that can evolve during the slurry formulation. The second effect is associated to zinc polymer interactions that can develop during the suspension preparation. Using methodologies based on rheometry and UV–Vis spectroscopy, the research identifies that the primary stabilization challenge is the adsorption of Carbopol<b>®</b> microgels onto zinc surfaces, which significantly influences the gel’s yield stress. These insights contribute to an enhanced understanding of the physical chemistry of the suspending fluid, facilitating the development of more efficient and stable Zn-Air RFBs.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 8","pages":"645 - 656"},"PeriodicalIF":2.3,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500915","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":"Elastic and shear-thinning effects in contraction flows: a comparison","authors":"Karen Y. Pérez-Salas,&nbsp;Erika. L. García-Romero,&nbsp;Alexa A. Barrientos-Cruz,&nbsp;Salvador Sánchez,&nbsp;Gabriel Ascanio,&nbsp;Juan P. Aguayo","doi":"10.1007/s00397-024-01462-y","DOIUrl":"10.1007/s00397-024-01462-y","url":null,"abstract":"<div><p>The flow through a 4:1 planar contraction has  been investigated using different rheological models having the same shear viscosity, namely, the inelastic Carreau-Yasuda model (CY), the enhanced Bautista-Manero-Puig (eBMP), and the exponential version of the Phan-Thien/Tanner (PTT). Noticeable discrepancies were observed with the CY model and the eBMP in terms of the velocity profiles along the centerline and in the exit channel (near the end of the geometry) normal to the flow direction. Transient planar extensional viscosity shows a large effect on vortex dynamics although the effect of transient and steady elongation on pressure drop seems negligible. Simulation results allowed gathering that pressure drop is largely influenced by the shear-thinning behavior of the fluid, noticeably affected by elasticity, and less by extensional viscosity.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 8","pages":"585 - 601"},"PeriodicalIF":2.3,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-024-01462-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500914","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":"Coupling slip and thixotropy to model the transient rheological behaviour of kaolinite suspensions","authors":"Jourdain H. Piette,&nbsp;Xiaohan Jia,&nbsp;Savvas G. Hatzikiriakos","doi":"10.1007/s00397-024-01461-z","DOIUrl":"10.1007/s00397-024-01461-z","url":null,"abstract":"<div><p>The transient rheological behaviour of semi-dilute kaolinite clay suspensions is investigated. Specifically, the flow curve hysteresis and step shear rate tests are used to investigate the shear behaviour of kaolinite suspensions. We found that there is a coupling effect between thixotropy and slip that dominates this transient rheological behaviour. It appears that the onset of solid-like slip in the system is a function of wall roughness and interfacial phenomena between the particles of the suspension and the wall. The coupled phenomena of slip and thixotropy are investigated using the application of sandpaper, varying the gap, and using different geometries. To illustrate the importance of slip in this system, we propose a Coupled Thixotropy and Slip (CTS) model that couples a thixotropic Structure Parameter Model (SPM) to an existing slip model.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 8","pages":"615 - 628"},"PeriodicalIF":2.3,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500917","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":"Rheological properties and the intrinsic mechanisms of fly ash/silicon-based shear thickening fluid","authors":"Li Sun,&nbsp;Geng Wang,&nbsp;Chunwei Zhang,&nbsp;Tianqi Liang","doi":"10.1007/s00397-024-01459-7","DOIUrl":"10.1007/s00397-024-01459-7","url":null,"abstract":"<div><p>We have found that the unique particle properties of fly ash can be applied to the modification of shear thickening fluid. In this paper, rheological properties and microscopic thickening mechanism of fly ash/silicon-based shear thickening fluid (subsequently abbreviated as FA/SiO₂-STF) are studied. Ultrasonic technology and mechanical stirring method were used to prepare FA/SiO₂-STF with different mass fractions of fly ash, and then rheometer was used to carry out steady-state rheological testing for FA/SiO₂-STF, and 4%FA/SiO₂-STF dynamic rheological test and temperature sensitivity testing, respectively. The thickening mechanism of FA/SiO₂-STF was analyzed by scanning electron microscope. The rheological test results show that the FA/SiO₂-STF with 4% fly ash content exhibits remarkable shear thickening effect. Finally, the relationship between the viscosity and shear rate of FA/SiO₂-STF is numerically described by a mathematical model, which can accurately reflect the viscosity thickening effect.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 8","pages":"603 - 613"},"PeriodicalIF":2.3,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500916","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":"Entangled linear polymers in fast shear: evaluation of differential tube-based modeling including flow-induced disentanglement and chain tumbling","authors":"Christina Pyromali,&nbsp;Hamid Taghipour,&nbsp;Laurence G. D. Hawke","doi":"10.1007/s00397-024-01450-2","DOIUrl":"10.1007/s00397-024-01450-2","url":null,"abstract":"<div><p>Flow-induced disentanglement (FID or CCR-D) and chain tumbling are two molecular mechanisms typically observed in non-equilibrium molecular dynamics simulations of entangled polymer melts under fast shear. As regards quantitative performance, classical tube models exhibit limitations at fast rates presumably due to the negligence of the aforementioned mechanisms. CCR-D or tumbling inclusion is reported in some revised tube models. For example, in Desai–Larson’s (DL) work (J Rheol 58:255–279, 2014), which focuses on uniaxial elongation, FID is coupled to the alignment and stretch status of the chains. In Costanzo et al. (Macromolecules 49:3925–3935, 2016), tumbling is accounted for via incorporation of a semi-empirical tumbling function in the stretch equation. Nevertheless, CCR-D is neglected. Here, we include tumbling in the DL differential constitutive set and we assess its performance at shear and relaxation following shear. Model predictions are compared against data on various polystyrene melts as obtained by a cone-partitioned-plate fixture.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 7","pages":"541 - 572"},"PeriodicalIF":2.3,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141257931","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":"A novel interpretation of pH-dependent microstructure and rheology evolution in silica suspension based on interparticle interactions","authors":"Hyo-Jeong Lee,&nbsp;Jun Dong Park","doi":"10.1007/s00397-024-01460-0","DOIUrl":"10.1007/s00397-024-01460-0","url":null,"abstract":"<div><p>We suggest a new interpretation for pH-dependent temporal evolution in the microstructure and rheology of silica suspensions based on interparticle interactions, which differs from the conventional explanation including the catalytic effect of hydroxyl ions and charges. The temporal evolution of silica suspensions under various pH conditions was investigated through rheometry and diffusing wave spectroscopy (DWS) analysis. The transition from liquid to solid was observed to be the most rapid at pH 5 compared to other pH conditions (pH 3, 7, 9). This phenomenon could not be adequately explained by the conventional Derjaguin-Landau-Verwey-Overbeek (DLVO) theory that predicts the liquid-to-solid transition occurs more rapidly at the lower pH condition due to the lower surface charge. As an alternative, we employed an elaborated DLVO theory that additionally considers the hydration force, arising from the hydrophilic nature of the silica surface. The pH dependency was interpreted using the elaborated DLVO theory, which showed that the strong short-range nature of the hydration force significantly reduced the attraction range at pH 3, leading to the retardation and decline in structural and rheological development. The impact of pH and resulting alterations in interparticle interaction on the microstructure were further investigated using rheological scaling theory.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 8","pages":"629 - 643"},"PeriodicalIF":2.3,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141382499","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":"Effect of fiber orientation on spinning dynamics for liquid crystalline polymer solutions using mesoscopic theory","authors":"Jihun Gil,&nbsp;Geunyeop Park,&nbsp;Heon Sang Lee,&nbsp;Hyun Wook Jung","doi":"10.1007/s00397-024-01456-w","DOIUrl":"10.1007/s00397-024-01456-w","url":null,"abstract":"<div><p>Liquid crystalline polymer (LCP) solutions undergo uniaxial elongation in fiber spinning, yielding highly oriented fibril-structured fibers with enhanced orientation and mechanical properties. This study explores how initial fiber orientation and Frank elasticity influence the dynamics and stability of the isothermal spinning process for LCP solutions. The simplified Larson-Doi mesoscopic model is employed, capable of capturing elastic stress emerging from domain structure evolution. Two main factors, inlet orientation and the Ericksen number as a parameter representing Frank elasticity, significantly affect steady-state fiber orientation profiles and the onset of draw resonance instability, as determined through linear stability analysis. The sensitivity of spinline flow to a sinusoidal disturbance is assessed using the frequency response method. Changes in stability onset concerning these two main factors are reasonably correlated with the extensional behavior of the LCP solution in the spinline and the results of the frequency response.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 7","pages":"529 - 539"},"PeriodicalIF":2.3,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141257867","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":"Limits for safe viscosity measurement of non-colloidal suspensions in rotational rheometry—a numerical simulation-based approach","authors":"Nezia de Rosso,&nbsp;Cezar O. R. Negrão","doi":"10.1007/s00397-024-01458-8","DOIUrl":"10.1007/s00397-024-01458-8","url":null,"abstract":"<div><p>This work investigates transient non-colloidal suspension flows in cone-and-plate, plate-plate, and cylindrical geometries to assess particle motion’s impact on viscosity measurement. Mass and momentum conservation equations model the two-phase liquid–solid flow, with both phases treated as continuous in an Euler-Euler approach. Findings demonstrate rheometric flow induces particle motion, affecting suspension homogeneity and viscosity measurement over time. Both buoyancy and inertia effects drive particle motion, with buoyancy dominating at low shear rates and inertia at high shear rates. Particle volume fractions, shear rates, and liquid viscosity notably influence viscosity measurements. Measurements with concentric cylinders are the least affected by particle motion. Additionally, we propose a time limit and a critical Reynolds number in which particle motion does not affect the measurement of the suspension viscosity.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 7","pages":"513 - 528"},"PeriodicalIF":2.3,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141189300","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":"Magnetic field-dependent rheological behavior of thermoresponsive poly(N-isopropylacrylamide) solutions","authors":"Christopher A. P. Neal,&nbsp;Abhishek M. Shetty,&nbsp;Jason D. Linn,&nbsp;Michelle C. Quan,&nbsp;Joseph D. Casas,&nbsp;Michelle A. Calabrese","doi":"10.1007/s00397-024-01454-y","DOIUrl":"10.1007/s00397-024-01454-y","url":null,"abstract":"<p>Magnetic (<b>B</b>) fields are an intriguing route for manipulating soft materials. While most research on <b>B</b> field manipulation of diamagnetic polymers has focused on alignment of ordered structures or anisotropic domains, our recent work uncovered a previously unrecognized effect: <b>B</b> fields alter hydration and hydrogen bonding in thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) solutions. Despite the well-known thermoreversible coil-to-globule transition and hydrogel formation upon heating, the impact of magnetic fields on these structural and rheological transitions has been largely unexplored. In this study, we thoroughly examined the temperature-dependent magnetorheology of PNIPAM solutions, varying <b>B</b> field strength, polymer content, and molecular weight. Linear magnetorheology reveals that increasing the <b>B</b> field intensity decreases the dynamic moduli of the resulting physical hydrogel, across polymer concentrations (5–20% wt) and molecular weights (30–108 kDa), by up to an order of magnitude. Conversely, the gelation onset temperature does not change substantially. This weakening effect is more pronounced at longer magnetization times and slower temperature ramp rates. Nonlinear magnetorheology following hydrogel formation reveals a two-step yielding process characteristic of attractive-driven glasses, suggesting that magnetization decreases both the stress and length scales associated with mesoglobule cage breaking. We propose that <b>B</b> fields impact the hydrogel rheology by altering the mesoglobule size and water content. This work uncovers essential understanding of how <b>B</b> fields alter hydrogel formation in PNIPAM solutions, broadening the scope of magnetic field manipulation of diamagnetic polymer solutions.</p>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 7","pages":"493 - 512"},"PeriodicalIF":2.3,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141189361","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":"Stress relaxation of critically fractionated entangled polybutadiene ring melts","authors":"Samruddhi Kamble,&nbsp;Daniele Parisi,&nbsp;Youncheol Jeong,&nbsp;Taihyun Chang,&nbsp;Dimitris Vlassopoulos","doi":"10.1007/s00397-024-01457-9","DOIUrl":"10.1007/s00397-024-01457-9","url":null,"abstract":"<div><p>We present linear viscoelastic data with anionically synthesized and critically fractionated polybutadiene (rich in vinyl content) rings having about <i>Z</i> = 22 entanglements. These rings are experimentally as pure as currently possible. They exhibit a power-law stress relaxation G(t) that is well-described by the state-of-the-art fractal loopy globule (FLG) model (power-law exponent of − 3/7). Previously reported data with polystyrene rings, prepared by anionic synthesis in dilute solution and purified by liquid chromatography at the critical condition, having <i>Z</i> = 14 entanglements, showed a power-law <i>G</i>(t) as well. Recent developments with different synthetic methods yielding not so well-characterized rings with a very large number of entanglements (up to 300), suggest that a rubbery plateau emerges in the linear viscoelastic response for <i>Z</i> &gt; 15. Our work confirms the power-law <i>G</i>(t) with the FLG exponent with another chemistry and contributes to the current discussion about different regimes of rheological behavior, indicating that a possible deviation from the power-law FLG type of behavior toward rubbery plateau may occur for Z &gt; 22. To fully capture the experimental <i>G</i>(t) data, the FLG model is complemented by two additional relaxation modes which are attributed to ring-ring (RR) and ring-linear (RL) threading, in accordance with recent reports in the literature. The faster RR mode likely reflects a new mechanism of stress relaxation not described by FLG, and the slower RL mode is attributed to synthetic and material handling imperfections (for example, due to thermal treatment). However, it does not change the punchline of the work: no rubbery plateau for entangled rings with up to 22 entanglements.</p><h3>Graphical Abstract</h3><p>Stress relaxation modulus for entangled ring polybutadiene (exhibiting power-law decay) and its linear precursor (exhibiting rubbery plateau), along with fits to the data: tube model for linear chains, and fractal loopy globule (FLG) with slow modes (RR and Tsalikis et al.) for the ring.</p>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 7","pages":"483 - 491"},"PeriodicalIF":2.3,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141166085","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}