Korea-Australia Rheology Journal最新文献_第10页

Rheological behavior and microstructure formation of Si/C anode slurries for Li-ion batteries 锂离子电池用硅/碳负极浆料流变行为及微观结构形成

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-09-11 DOI: 10.1007/s13367-023-00067-w

Jeong Hoon Park, Chan Hyeok Ahn, Kyung Hyun Ahn

{"title":"Rheological behavior and microstructure formation of Si/C anode slurries for Li-ion batteries","authors":"Jeong Hoon Park, Chan Hyeok Ahn, Kyung Hyun Ahn","doi":"10.1007/s13367-023-00067-w","DOIUrl":"10.1007/s13367-023-00067-w","url":null,"abstract":"<div><p>In this study, we systematically investigate the rheological behavior and microstructure formation of the anode slurries containing silicon (Si), carbon black (CB), and carboxymethyl cellulose (CMC) from the perspective of interactions between the constituent components, aiming to provide a fundamental understanding of the dispersion characteristics of Si-based anode slurries. The CMC adsorbs onto both particles (CB/Si) but has different effects on the inter-particle interactions (CB–CB and Si–Si). It stabilizes the CB particles through electro-steric interactions, whereas it agglomerates the Si particles through bridging interactions, in aqueous medium. In the meanwhile, the CMC selectively adsorbs onto CB particles among the two particles. Therefore, at a CMC content lower than the optimum graft density where CB particles are adsorbed and saturated by CMC, it acts as a dispersant in the slurries. However, at a higher content, the CMC that remains after adsorption on CB particles adsorbs onto Si particles and acts as a flocculant for the particles in the slurries. The origin of selective adsorption is understood in terms of the driving forces for adsorption and the surface energy analysis. We anticipate our findings provide a useful guideline for the Si slurry design in terms of its dispersion and contribute to the development of Si anode technology.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 4","pages":"335 - 347"},"PeriodicalIF":1.3,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135936323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

The conflicting role of shear thinning and extensional thickening on corner vertex within entry flow for branched and filled polymer melts 支化填充聚合物熔体入口流动角点剪切减薄与拉伸增厚的冲突作用

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-08-31 DOI: 10.1007/s13367-023-00068-9

Huan-Chang Tseng

引用次数: 0

Research on the rheological properties of a silicone oil-based ferrofluid 硅油基铁磁流体流变特性研究

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-08-21 DOI: 10.1007/s13367-023-00065-y

Jiajia Zhang, Hongchao Cui, Shida Han, Zhenkun Li, Jingjing Lu

{"title":"Research on the rheological properties of a silicone oil-based ferrofluid","authors":"Jiajia Zhang, Hongchao Cui, Shida Han, Zhenkun Li, Jingjing Lu","doi":"10.1007/s13367-023-00065-y","DOIUrl":"10.1007/s13367-023-00065-y","url":null,"abstract":"<div><p>To study the overall rheological characteristics of the silicone oil-based ferrofluid, a chemical co-precipitation method was adopted for preparation, and transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) were used for characterization. The average size of Fe<sub>3</sub>O<sub>4</sub> magnetic particles was 10.4 nm and the saturation magnetization of the ferrofluid was 5.98 emu/g. Then, the fluidity, magnetoviscous effect and viscoelasticity of the ferrofluid were studied using a rotational rheometer. The results showed obvious shear thinning of the silicone oil-based ferrofluid under an external magnetic field, and the yield stress of the ferrofluid could not be accurately obtained by fitting the flow curve with an H–B model at a continuous shear rate. A strong magnetoviscous effect could be observed at different shear rates and temperatures. The magnetoviscous parameter <i>R</i> increased with the increase of temperature and its variation decreased with the increase of shear rate. Moreover, based on the magnetic particle chain model and the viscosity–temperature characteristics of the base carrier liquid, different mechanisms of temperature influence on the magnetoviscous effect were analyzed. Finally, a discussion of the microstructure evolution mechanism of the ferrofluid in the modulus changing with frequency was presented through the viscoelastic analysis of the silicone oil-based ferrofluid.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"179 - 190"},"PeriodicalIF":1.3,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-023-00065-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Pulsatile flow of thixotropic blood in artery under external body acceleration and uniform magnetic field: Biomedical Application 体外加速度和均匀磁场作用下动脉触变性血的脉动流动:生物医学应用

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-08-19 DOI: 10.1007/s13367-023-00066-x

Louiza Cheffar, Abdelhakim Benslimane, Karim Bekkour, Djamel Sadaoui, Adel Benchabane

{"title":"Pulsatile flow of thixotropic blood in artery under external body acceleration and uniform magnetic field: Biomedical Application","authors":"Louiza Cheffar, Abdelhakim Benslimane, Karim Bekkour, Djamel Sadaoui, Adel Benchabane","doi":"10.1007/s13367-023-00066-x","DOIUrl":"10.1007/s13367-023-00066-x","url":null,"abstract":"<div><p>In this work, a numerical model is carried out to investigate the magneto-hemodynamics of blood driven by an oscillating pressure gradient and exposed to a uniform magnetic field and an external body acceleration. The non-Newtonian nature of blood was taken into account using a time-dependent thixotropic model. Incompressible, axisymmetric, and laminar flow assumptions were used to simplify the non-linear partial differential equations. The velocity field and wall shear stress distribution are numerically solved using the finite difference method. The analytical solution of the velocity distribution of a fully developed pulsatile flow of a Newtonian fluid is used to validate the numerical solution. Further research is done into how structural traits, the average of the pressure gradient, body acceleration, and the magnetic field affect the magneto-hemodynamic properties of blood. The findings indicate how the various characteristics taken into account affected the blood's magneto-hemodynamic behavior in arteries.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 4","pages":"361 - 372"},"PeriodicalIF":1.3,"publicationDate":"2023-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84751988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Temperature-dependent rheological behavior of cathode slurry for lithium-ion battery under steady and dynamic tests 锂离子电池正极浆料在稳态和动态试验下的温度依赖性流变行为

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-07-11 DOI: 10.1007/s13367-023-00064-z

Bin Zhao, Deshun Yin, Yunfei Gao, Jiangtao Ren

{"title":"Temperature-dependent rheological behavior of cathode slurry for lithium-ion battery under steady and dynamic tests","authors":"Bin Zhao, Deshun Yin, Yunfei Gao, Jiangtao Ren","doi":"10.1007/s13367-023-00064-z","DOIUrl":"10.1007/s13367-023-00064-z","url":null,"abstract":"<div><p>The rheological property of cathode slurry is commonly influenced by coating speed and mixing temperature, thereby leading to its storage stability and coating uniformity. In this study, the effect of the temperature of slurry on the rheological behaviors is investigated under various shear rates and temperatures based on steady and dynamic tests as well as theoretical models. In the flow experiments, the thixotropic behavior of the slurry is observed at all temperatures tested, and it is reduced with the increase in temperature. The experimental data is captured well by rheological models, and the model parameters are evaluated under the combined effects of shearing and temperature, resulting in two generalized state equations for the description of the flow properties of the slurry. In addition, microstructural rearrangement and polymeric entanglement at high temperatures cause viscosity and modulus to change, giving rise to complex rheological behavior in creep and oscillatory shear. Compared with slurry at 25 and 40 °C, both storage and loss moduli are dependent on oscillatory strain in the range of 0.1–1000% at 65 °C. The difference in characteristic strain corresponding to yielding and strain stiffening behavior is only observed at high temperatures, whereas relaxation times were independent of temperature in the oscillatory shear test. Understanding the effect of the temperature of slurry on rheological behaviors will be useful for improving the manufacturing efficiency of electrodes.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"191 - 201"},"PeriodicalIF":1.3,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Combined effect of hybrid carbon fillers on the physical and rheological properties of polyvinylidene fluoride composites 杂化碳填料对聚偏氟乙烯复合材料物理流变性能的综合影响

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-07-08 DOI: 10.1007/s13367-023-00062-1

Wonjun Kim, Yuna Oh, Jong-Young Jeon, Bong-Seob Shin, Youngho Eom, Dong Wook Chae

{"title":"Combined effect of hybrid carbon fillers on the physical and rheological properties of polyvinylidene fluoride composites","authors":"Wonjun Kim, Yuna Oh, Jong-Young Jeon, Bong-Seob Shin, Youngho Eom, Dong Wook Chae","doi":"10.1007/s13367-023-00062-1","DOIUrl":"10.1007/s13367-023-00062-1","url":null,"abstract":"<div><p>Three different types of carbon materials [carbon nanotubes (CNTs), carbon black (CB), and carbon fibers (CFs)] were incorporated into polyvinylidene fluoride (PVDF) as single fillers or hybrid fillers (CNT/CB and CNT/CF) via solution blending. The physical properties of the hybrid filler systems such as the electrical, thermal, morphological, and rheological properties were compared to those of the single filler systems. Images of the PVDF composites containing hybrid fillers obtained by a field-emission scanning electron microscope showed that CB appeared to be embedded between highly entangled nanotubes, promoting their debundling in the PVDF matrix. The hybrid filler systems of CB and CF with 0.5 wt% nanotubes were electrically conductive from the corresponding content of 1 wt%, showing maximum values from 5 wt% CB and 10 wt% CF. In the hybrid filler systems, the extent of the increase in crystallization temperature (Tc) in the presence of CB or CF was more prominent at a lower CNT content of 0.5 wt%. In the hybrid systems of CB with 0.5 wt% nanotubes, the melting peak for the β phase was generated from 1 wt% CB and its intensity increased with CB content. On the contrary, the hybrid filler systems of CF with nanotubes did not provide a new peak. Regarding the rheological properties, the complex viscosity (<i>η</i>*) of PVDF/CNT0.5/CB increased with CB content, a pattern similar to that of the single filler system of CB. On the contrary, the presence of CF with 0.5 wt% nanotubes slightly increased <i>η</i>* with CF content, while that with 1 wt% nanotubes notably increased <i>η</i>*, exhibiting a sharp increase at 10 wt%.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"137 - 155"},"PeriodicalIF":1.3,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 electro-osmosis on lubrication of fresh cement paste-based material in contact with a metal wall 电渗透对接触金属壁的新鲜水泥浆基材料润滑的影响

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-07-03 DOI: 10.1007/s13367-023-00063-0

Viet Hai Hoang, Tu Anh Do, Anh Tuan Tran, Christophe Lanos, Yannick Mélinge

引用次数: 0

Surface characteristics of metal-like composites fabricated with aliphatic polyketone 脂肪族聚酮制备的类金属复合材料的表面特性

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-06-27 DOI: 10.1007/s13367-023-00061-2

Ji Won Jeong, Young Seok Song

引用次数: 0

Thixotropic behavior and particulate aggregation in a suspension of carbon nanotubes 碳纳米管悬浮液中的触变行为和微粒聚集

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-06-14 DOI: 10.1007/s13367-023-00060-3

Daeun Lee, Sangkyun Koo

{"title":"Thixotropic behavior and particulate aggregation in a suspension of carbon nanotubes","authors":"Daeun Lee, Sangkyun Koo","doi":"10.1007/s13367-023-00060-3","DOIUrl":"10.1007/s13367-023-00060-3","url":null,"abstract":"<div><p>The present study dealt with the evaluation of the particulate aggregation in a suspension of multi-walled carbon nanotubes using fractal theory and rheological properties including thixotropy. The multi-walled carbon nanotubes are dispersed in Newtonian glycerol in the concentration range between 0.2 and 0.45 wt%. Rheological measurement was performed for the suspension at various dispersion times up to 300 min. The suspension showed thixotropy, shear-thinning behavior, and yield stress. It also exhibited plateaus of storage modulus in frequency and strain sweep tests. As the dispersion time increases, thixotropy, low-shear viscosities, and yield stress increase, and then their increasing rates slow down. Suspension’s electrical conductivity also showed similar behavior as that of thixotropy with the dispersion time. Viscoelastic behavior was combined with a fractal concept to provide the fractal dimensions of the flocs in the suspension at various dispersion times. The fractal dimension tends to decrease with the dispersion time. Conclusively it is interpreted that as the dispersion proceeds flocs become smaller and chain-like, then the reduced and thinned flocs build the wider range of network structures at rest state.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"127 - 135"},"PeriodicalIF":1.3,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-023-00060-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Mechanical degradation of poly(ethylene terephthalate) and its structural modification by chain extender 聚对苯二甲酸乙酯的机械降解及其扩链剂的结构改性

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-05-30 DOI: 10.1007/s13367-023-00059-w

Samuel Muobom Saabome, Jae Eun Lee, Joung Sook Hong, Dong Hak Kim, Kyung Hyun Ahn

{"title":"Mechanical degradation of poly(ethylene terephthalate) and its structural modification by chain extender","authors":"Samuel Muobom Saabome, Jae Eun Lee, Joung Sook Hong, Dong Hak Kim, Kyung Hyun Ahn","doi":"10.1007/s13367-023-00059-w","DOIUrl":"10.1007/s13367-023-00059-w","url":null,"abstract":"<div><p>Characterized by high strength to unit weight, poly(ethylene terephthalate) (PET) remains one of the most widely used engineering plastics, hence the attention to its associated waste and recycling technology development has been paid from academic and industrial perspectives. Herein, we investigate the mechanical degradation of PET through degradative compounding process cycles and the effect of chain extender (Joncryl<sup>®</sup> ADR 4468) to prevent molecular degradation of PET during melt processing. They are characterized based on rheological and mechanical measurements. Characterization of the bottle-grade PET samples reveals low viscosity and crystallinity owing to isophthalic acid units within the PET copolymer structure over PET homopolymer. Mechanical shear and thermal impact by virtue of the increase in rotor speed and temperature are employed to study the degradation of the PET samples. Both samples respond to degradation in successive processing cycles with as much as 70% decrease in their complex viscosity and moduli. The molecular weight of PET copolymer accordingly decreases from 23,400 to 8010 g/mol. Chain scission arising from thermo-mechanical degradation results in high crystallinity by more than five folds in the processed PETs. Attributed to recoupling of the degraded short chains, the chain extender compensates with the increase in viscosity and moduli up to 20% whilst serving to increase crystallinity but almost ineffective in appreciating mechanical performance with barely any significant variation in tensile strength and elongation at break. This study shows that mechanical shear is verified to impact a pronounced degradation on PET more than thermal action on the samples.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"203 - 212"},"PeriodicalIF":1.3,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-023-00059-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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