Rheologica Acta最新文献

The complex rheological behavior of a simple yield stress fluid 简单屈服应力流体的复杂流变行为

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-09-23 DOI: 10.1007/s00397-024-01468-6

Francesco Accetta, David C. Venerus

引用次数: 0

Orthogonal superposition rheometry of soft core–shell microgels 软核壳微凝胶的正交叠加流变仪

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-09-17 DOI: 10.1007/s00397-024-01469-5

Panagiota Bogri, Gabriele Pagani, Jan Vermant, Joris Sprakel, George Petekidis

{"title":"Orthogonal superposition rheometry of soft core–shell microgels","authors":"Panagiota Bogri, Gabriele Pagani, Jan Vermant, Joris Sprakel, George Petekidis","doi":"10.1007/s00397-024-01469-5","DOIUrl":"10.1007/s00397-024-01469-5","url":null,"abstract":"<div><p>The mechanisms of flow in suspensions of soft particles above the glass-transition volume fraction and in the jammed state were probed using orthogonal superposition rheometry (OSR). A small amplitude oscillatory shear flow is superimposed orthogonally onto a steady shear flow, which allows monitoring the viscoelastic spectra of sheared jammed core–shell microgels during flow. The characteristic crossover frequency <i>ω</i><sub>c</sub>, deduced from the viscoelastic spectrum, provides information about the shear-induced structural relaxation time, which is connected to the microscopic yielding mechanism of cage breaking. The shear rate evolution of the crossover frequency is used to achieve a superposition of all spectra and get a better insight of the flow mechanism. Despite their inherent softness, the hybrid core–shell microgels exhibit similarities with hard sphere-like flow behavior, with the main difference that for the microgels, the transition from a glassy to a jammed state introduces a volume fraction dependence of the scaling of <i>ω</i><sub>c</sub> with shear rate. We further check the application of the Kramers–Kronig relations on the experimental low strain amplitude OSR data finding a good agreement. Finally, the low frequency response at high strain rates was investigated with open bottom cell geometry, and instrumental limits were identified. Based on these limits, we discuss previous OSR data and findings in repulsive and attractive colloidal glasses and compare them with the current soft particle gels.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 9-10","pages":"705 - 717"},"PeriodicalIF":2.3,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258523","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}

引用次数: 0

Effect of urea on the linear and nonlinear rheological properties of human serum albumin hydrogels 尿素对人血清白蛋白水凝胶线性和非线性流变特性的影响

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-08-16 DOI: 10.1007/s00397-024-01467-7

Tochukwu Olunna Nnyigide, Osita Sunday Nnyigide, Kyu Hyun

{"title":"Effect of urea on the linear and nonlinear rheological properties of human serum albumin hydrogels","authors":"Tochukwu Olunna Nnyigide, Osita Sunday Nnyigide, Kyu Hyun","doi":"10.1007/s00397-024-01467-7","DOIUrl":"10.1007/s00397-024-01467-7","url":null,"abstract":"<div><p>We report the linear and nonlinear rheological properties of human serum albumin (HSA) hydrogels with and without urea using small (SAOS) and large (LAOS) amplitude oscillatory shear tests. In SAOS tests, pure HSA and HSA-urea hydrogels exhibited a predominantly solid-like behavior (G' ≫ G''), with viscoelastic properties proportional to HSA concentrations. As urea concentration increased, the viscoelastic properties of the hydrogels decreased and the frequency dependence declined, indicating a sparser cross-linking network. Under LAOS flow, both pure HSA and HSA-urea hydrogels exhibited intra- and inter-cycle strain-stiffening, which became more pronounced with increasing urea concentration. The presence of urea delayed the onset of the nonlinear behavior in HSA-urea hydrogels, in proportion to the urea concentration, decreasing the hydrogel strength. The degree of nonlinearity, quantified by the intrinsic nonlinear parameter Q<sub>0</sub> from Fourier-transform rheology, decreased with increasing urea concentration. Additionally, critical strain amplitudes obtained from LAOS tests indicated that the yield strain of the HSA-urea hydrogels increased with urea concentration. The intracycle behavior was analyzed by sequence of physical processes methods. Molecular dynamics simulations were performed to analyze the hydrogels behavior at the atomic level. Significant changes in the hydrogel network were attributed to the efficient insertion of urea into the HSA hydrogen bond network, which forms the cross-linking network. Thus, the hydrogen bonding between urea and HSA, as well as urea’s contribution to HSA denaturation, affects the gelation, linear, and nonlinear viscoelastic properties of the HSA hydrogels.</p></div>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 9-10","pages":"689 - 704"},"PeriodicalIF":2.3,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225587","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}

引用次数: 0

Swimming in viscoplastic fluids 在粘性流体中游泳

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-08-06 DOI: 10.1007/s00397-024-01466-8

Duncan R. Hewitt

引用次数: 0

Discrepancies in dynamic yield stress measurements of cement pastes 水泥浆动态屈服应力测量中的差异

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-08-01 DOI: 10.1007/s00397-024-01465-9

Subhransu Dhar, Teresa Liberto, Catherine Barentin, Thibaut Divoux, Agathe Robisson

{"title":"Discrepancies in dynamic yield stress measurements of cement pastes","authors":"Subhransu Dhar, Teresa Liberto, Catherine Barentin, Thibaut Divoux, Agathe Robisson","doi":"10.1007/s00397-024-01465-9","DOIUrl":"10.1007/s00397-024-01465-9","url":null,"abstract":"<p>The dynamic yield stress associated with the flow cessation of cement pastes is measured using a rheometer equipped with various shear geometries such as vane, helical, sandblasted co-axial cylinders, and serrated parallel plates, as well as with the mini-cone spread test. Discrepancies in yield stress values are observed for cement pastes at various volume fractions, with one to two orders of magnitude difference between vane, helical and mini-cone spread measurements on the one hand, and co-axial cylinder and parallel plate measurements on the other hand. To understand this discrepancy, the flow profile of a cement paste in the parallel-plate geometry is investigated with a high-speed camera, revealing the rapid formation of an un-sheared band near the static bottom plate. The width of this band depends upon the rotational velocity of the top plate, and upon the shear time. Recalculation of shear stress shows that the reduced sheared gap alone cannot explain the low measured yield stress. Further exploration suggests the formation of zones with lower particle content, possibly linked to cement particle sedimentation. Here, we argue that the complex nature of cement pastes, composed of negatively buoyant non-Brownian particles with attractive interactions due to highly charged nano-size hydration products, accounts for their complex rheological behavior.</p>","PeriodicalId":755,"journal":{"name":"Rheologica Acta","volume":"63 9-10","pages":"657 - 672"},"PeriodicalIF":2.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-024-01465-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141886856","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}

引用次数: 0

The effect of rotationality on nonlinear shear flow of polymer melts and solutions 旋转性对聚合物熔体和溶液非线性剪切流动的影响

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-07-25 DOI: 10.1007/s00397-024-01463-x

Manfred H. Wagner, Shuang Liu, Qian Huang

{"title":"The effect of rotationality on nonlinear shear flow of polymer melts and solutions","authors":"Manfred H. Wagner, Shuang Liu, Qian Huang","doi":"10.1007/s00397-024-01463-x","DOIUrl":"10.1007/s00397-024-01463-x","url":null,"abstract":"<div><p>By considering the rotationality of shear flow, we distinguish between tube segments created by reptation before the inception of shear flow and those created during flow. Tube segments created before inception of shear flow experience both stretch and orientation, while tube segments created after inception of flow are not stretched, but are only aligned in the flow direction. Based on this idea, the Rotation Zero Stretch (RZS) model allows for a quantitative description of the start-up of shear flow and stress relaxation after step-shear strain experiments, in agreement with data of polystyrene long/short blends and corresponding polystyrene 3-arm star polymers investigated by Liu et al. (Polymer 2023, 281:126125), as well as the shear viscosity data of poly(propylene carbonate) melts reported by Yang et al. (Nihon Reoroji Gakkaishi 2022, 50:127–135). In the limit of steady-state shear flow, the RZS model converges to the Doi-Edwards IA model, which quantitatively describes the steady-state shear viscosity of linear polymer melts and long/short blends. The assumption of “non-stretching” of tube segments created during rotational flow is therefore in agreement with the available experimental evidence. Three-arm star polymers behave in a similar way as corresponding blends of long and short polymers confirming the solution effect of the short arm in asymmetric stars. The analysis of step-shear strain experiments reveals that stress relaxation is at first dominated by stretch relaxation, followed at times larger than the Rouse stretch relaxation time by relaxation of orientation as described by the damping function of the Doi-Edwards IA model. The RZS model does not require any nonlinear-viscoelastic parameter, but relies solely on the linear-viscoelastic relaxation modulus and the Rouse stretch relaxation time.</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":"573 - 584"},"PeriodicalIF":2.3,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00397-024-01463-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141780995","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}

引用次数: 0

Investigating the interactions between Carbopol® and zinc particles within the context of a zinc-air redox flow batteries application 在锌-空气氧化还原流动电池应用中研究Carbopol®与锌颗粒之间的相互作用

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-06-28 DOI: 10.1007/s00397-024-01464-w

Diego Milian, Yahya Rharbi, Nadia El Kissi

{"title":"Investigating the interactions between Carbopol® and zinc particles within the context of a zinc-air redox flow batteries application","authors":"Diego Milian, Yahya Rharbi, 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}

引用次数: 0

Elastic and shear-thinning effects in contraction flows: a comparison 收缩流中的弹性和剪切稀化效应：比较

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-06-27 DOI: 10.1007/s00397-024-01462-y

Karen Y. Pérez-Salas, Erika. L. García-Romero, Alexa A. Barrientos-Cruz, Salvador Sánchez, Gabriel Ascanio, Juan P. Aguayo

引用次数: 0

Coupling slip and thixotropy to model the transient rheological behaviour of kaolinite suspensions 耦合滑移和触变性来模拟高岭石悬浮液的瞬态流变行为

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-06-19 DOI: 10.1007/s00397-024-01461-z

Jourdain H. Piette, Xiaohan Jia, Savvas G. Hatzikiriakos

引用次数: 0

Rheological properties and the intrinsic mechanisms of fly ash/silicon-based shear thickening fluid 粉煤灰/硅基剪切增稠流体的流变特性和内在机理

IF 2.3 3区工程技术

Rheologica Acta Pub Date : 2024-06-18 DOI: 10.1007/s00397-024-01459-7

Li Sun, Geng Wang, Chunwei Zhang, Tianqi Liang

引用次数: 0