Korea-Australia Rheology Journal最新文献

{"title":"Design and fabrication of nanolayered colorless polyimide/Si3N4 optical film","authors":"Jae Seung Lee,&nbsp;Zheng Min Huang,&nbsp;Young Seok Song","doi":"10.1007/s13367-024-00113-1","DOIUrl":"10.1007/s13367-024-00113-1","url":null,"abstract":"<div><p>In this study, low-reflective multilayer films (LRMFs) and high-reflective multilayer films (HRMFs) were designed and manufactured using colorless polyimide (CPI) as a low refractive index layer and Si₃N₄ as a high refractive index layer. A numerical simulation was conducted to design a nanolayered structure with different reflectivity characteristics at specific wavelengths. Rheological analysis was performed to determine a solution concentration needed for coating CPI at the nanoscale via the wet process. A layer of 89 nm was found to be formed stably using a 5wt% CPI solution at 5000 rpm. The results revealed that LRMFs exhibited less than 1% reflectivity at the central wavelength, while HRMFs showed more than 40% reflectivity at the central wavelength. Morphological analysis confirmed that the designed nanostructures were successfully fabricated. This research has provided a new way to fabricate optical film through the wet process.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"37 1","pages":"57 - 66"},"PeriodicalIF":2.2,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513183","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}

{"title":"Solute dispersion in a permeable capillary with wall exchange: Darcy flow model","authors":"Ashis Kumar Roy,&nbsp;O. Anwar Bég,&nbsp;Sachin Shaw,&nbsp;Lazaro Revocatus Mashiku,&nbsp;Tasveer A. Bég","doi":"10.1007/s13367-024-00116-y","DOIUrl":"10.1007/s13367-024-00116-y","url":null,"abstract":"<div><p>Complex chemical reactions and hydrodynamic dispersion feature in many aspects of hemodynamics. Motivated by examining the reactive phase change dispersion in perfusion, a mathematical study is presented for solute dispersion in incompressible laminar blood flow through a straight circular capillary with a permeable wall (enabling lateral movement across the vessel fenestrations in perfusion and associated with the presence of the endothelial layer). The boundary condition at the vessel wall is considered a reversible phase exchange process based on first-order chemical kinetics. Darcy’s law is deployed to feature the permeability nature of the capillary. A multiple-scale asymptotic analysis is developed, and a non-dimensional transverse averaged “macro-transport” equation for convective diffusion–dispersion is derived. Expressions are then presented for the advection coefficient and Taylor dispersion coefficient. Numerical evaluation of the impact of key control parameters i.e., permeability parameter, pressure parameter, retention parameter (α), Damköhler number (Da) on dispersion coefficient, advection coefficient and leading order concentration of the solute is conducted, and solutions are visualized graphically both for small and large times. The novelty of the present work is, therefore, the collective consideration of complex wall permeability and pressure difference in addition to boundary reaction and Darcian body force effects. The analysis shows that the dispersion coefficient is initially enhanced gradually with an increment in the retention parameter with its initial small value and thereafter exhibits a smooth decay. The hydrodynamic dispersion coefficient markedly decreases with higher values of the permeable parameter. A higher magnitude of dispersion coefficient is computed at the vessel inlet and then decreases towards the outlet. A boost in the leading order concentration of the solute is computed at small times but is stabilized and eventually remains invariant with time. The axial velocity is found to depend strongly on the axial position in the capillary. A displacement in concentration peaks is also observed which is attributable to advection along the axial direction, and the decreasing peaks with respect to time are due to the diffusion of the solute from the fluid phase to the vessel wall. Generally, it is also observed that retention enhances the chemical reaction effect, leading to a greater loss of solute over time. The simulations are relevant to chemo-hemodynamics and also may find applications in drug delivery (pharmacodynamics).</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"37 1","pages":"1 - 18"},"PeriodicalIF":2.2,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513288","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}

{"title":"Solution rheology of poly(ionic liquid)s: current understanding and open questions","authors":"Atsushi Matsumoto","doi":"10.1007/s13367-024-00115-z","DOIUrl":"10.1007/s13367-024-00115-z","url":null,"abstract":"<div><p>Poly(ionic liquid)s are ion-containing polymers possessing ionic liquid structures on their repeating units. Owing to the unique physicochemical properties of ionic liquids, many existing studies have found that the properties of poly(ionic liquid)s are distinct from those of conventional ion-containing polymers, such as poly(sodium styrene sulfonate). A lot of scientific efforts have been made to understand the relationship between the chemical structure and the material properties of poly(ionic liquid)s, and several good review papers are available in the literature. The aim of this short review is to summarize key results on the viscoelastic properties of poly(ionic liquid)s in solution. We discuss in detail the counterion condensation and the charge screening in poly(ionic liquid) solutions.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 4","pages":"319 - 328"},"PeriodicalIF":2.2,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-024-00115-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875233","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}

{"title":"Flow-induced demixing of polyisoprene/poly(4-tert butyl styrene) with high dynamic contrast","authors":"Zonghao Hong,&nbsp;Shilong Wu,&nbsp;Quan Chen","doi":"10.1007/s13367-024-00114-0","DOIUrl":"10.1007/s13367-024-00114-0","url":null,"abstract":"<div><p>This study places a focus on flow-induced demixing of polyisoprene (PI) and poly(4-tert butyl styrene) (PtBS) polymer blends with high dynamic contrast. The rheological response is governed by the more immobilized PtBS chains. In contrast, the dielectric response at low frequency reflects exclusively the normal mode of PI chains having type-A dipole parallel along the chain backbone. These features enable selective detection of the component dynamics of PtBS or PI chains under either the small amplitude oscillatory shear or the nonlinear steady shear through a combination of rheological and dielectric techniques. We find the Cox–Merz rule fails significantly for the PtBS/PI blends, which is attributed to flow-induced demixing when the shear rate is higher than the relaxation rate of PtBS chains and lower than that of PI chains. The flow-induced demixing is further supported by varying the molecular parameters of PtBS, copolymerizing PtBS with polystyrene, as well as by the rheo-dielectric measurements that show a broadening of the PI relaxation mode distribution. This demixing could be partly driven by the increased conformational entropy of the PI chains after segregation from the surrounding restrictive PtBS chains.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"37 1","pages":"19 - 28"},"PeriodicalIF":2.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513133","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}

{"title":"Recent developments on multiscale simulations for rheology and complex flow of polymers","authors":"Takeshi Sato,&nbsp;Kenji Yoshimoto","doi":"10.1007/s13367-024-00112-2","DOIUrl":"10.1007/s13367-024-00112-2","url":null,"abstract":"<div><p>This review summarized the multiscale simulation (MSS) methods for polymeric liquids. Since polymeric liquids have multiscale characteristics of monomeric, mesoscopic, and macroscopic flow scales, MSSs that relate different hierarchical levels are adequate to reproduce flow properties accurately. Our review includes pioneering studies to the most advanced MSS studies on rheology predictions and flow simulations of polymeric liquids. We discuss two major types of MSS methods: the bottom-up and model-embedded MSS methods. The former method mainly connects all-atom molecular dynamics models and mesoscopic models to predict rheological properties. In contrast, the latter method, where a microscopic or mesoscopic model is embedded in a macroscopic computational domain, is designed to predict macroscopic flow properties. Finally, we also discuss MSS methods using machine learning techniques.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 4","pages":"253 - 269"},"PeriodicalIF":2.2,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-024-00112-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875297","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}

{"title":"A review on rheological approaches as a perfect tool to monitor thermal degradation of biodegradable polymers","authors":"Reza Salehiyan,&nbsp;Sanaz Soleymani Eil Bakhtiari","doi":"10.1007/s13367-024-00111-3","DOIUrl":"10.1007/s13367-024-00111-3","url":null,"abstract":"<div><p>This review provides an in-depth analysis of the thermal degradation of biodegradable polymers through rheological methods. Focusing on key techniques such as time sweep tests, frequency sweep tests, and nonlinear rheological analyses gained at higher shear tests, the review highlights how these approaches offer critical insights into polymer stability and degradation kinetics. It entails an understanding of how molecular weight reduction, a common degradation mechanism, significantly impacts the performance of biodegradable polymers, and how the use of appropriate fillers can enhance thermal stability by mitigating chain scission. The review also discusses the application of the Arrhenius equation in modelling thermal degradation, helping predict degradation rates and optimize processing conditions. Time sweep tests are particularly emphasized for their ability to monitor polymer stability under various environmental conditions, while frequency sweep tests provide insights into the effects of processing/thermal history on material degradation. Tests at higher shear rates, which simulate real-world processing conditions such as extrusion and injection moulding, are explored for their role in understanding how processing-induced shear forces accelerate polymer degradation. Various biodegradable polymers are considered in this review, with polylactic acid (PLA) being the dominant polymer studied across most research, providing a clear picture of its degradation behaviour and strategies for enhancing its thermal stability. Therefore, it is expected that this review will be a comprehensive guide for researchers and engineers looking to optimize the thermal stability and performance of biodegradable polymers in various industrial applications.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 4","pages":"295 - 317"},"PeriodicalIF":2.2,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-024-00111-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875234","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}

{"title":"Comparison of methodologies for the application of the Onsager variational principle","authors":"Kwang Soo Cho","doi":"10.1007/s13367-024-00109-x","DOIUrl":"10.1007/s13367-024-00109-x","url":null,"abstract":"<p>Doi suggested a way to apply the Onsager variational principle to various complex fluids. However, since the Onsager principle is constructed by a daring generalization of classical irreversible thermodynamics (linear theory of fluxes and forces) in an inductive manner, it is questionable whether it can be applied to complex fluids which need non-classical state variables, which may called internal variables, and may require nonlinear relations between fluxes and forces. Since Doi’s approach is based on isothermal process and the stress formula which is defined from an analogy to an approximate equation for creeping flow, it is restricted to incompressible fluid. Our variational thermodynamics derives the Onsager variational principle in a deductive manner and removes the demerits of the Doi’s application of the Onsager variational principle. Our theory allows that regardless of the user's expertise, simply selecting state variables can automatically determine the arguments of the dissipation function and find the desired constitutive equations.</p>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"37 1","pages":"43 - 55"},"PeriodicalIF":2.2,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513244","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}

{"title":"The role of rheology in cosmetics research: a review","authors":"Juri Kim,&nbsp;Eun Hui Jeong,&nbsp;Joon Hyun Baik,&nbsp;Jun Dong Park","doi":"10.1007/s13367-024-00108-y","DOIUrl":"10.1007/s13367-024-00108-y","url":null,"abstract":"<div><p>Since the dawn of human civilization, cosmetics have been an important part of life for various reasons, including aesthetic purposes, skin protection, and representing social status and ideology for social and political reasons. Nowadays, due to advances in science and technology, cosmetics comes in countless distinctive formulations, each tailored to specific purposes and preferences. Rheology has been an essential tool in designing and analyzing complex cosmetic formulations, because of inherent characteristics of their usage, which inevitably involves processes of flow and deformation. Typically, the sensory texture of cosmetic formulations has been correlated with rheological measurements. Furthermore, because the physical and chemical properties, as well as the microstructural status of cosmetic formulations, are well reflected in their rheological behavior, rheology has proven to be an effective metric for assessing stability. This review aims to provide a structured overview of how rheology has been utilized in the cosmetics field and highlight its advancements. We specifically focus on the role of rheology in analyzing the sensory texture and stability in cosmetic formulations, emphasizing a variety of previous studies. In the last part, we present latest applications of rheological analysis combined with other modern techniques, including artificial intelligence and eco-friendly technologies.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 4","pages":"271 - 282"},"PeriodicalIF":2.2,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875301","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}

{"title":"A review of rheology for ring polymers and polymers with internal loops: comparison of recent experimental and theoretical studies","authors":"Yuya Doi","doi":"10.1007/s13367-024-00110-4","DOIUrl":"10.1007/s13367-024-00110-4","url":null,"abstract":"<div><p>Polymer architecture (i.e., chain connecting manner) and properties are closely correlate, and strongly influence rheological properties that reflect microscopic molecular dynamics. This review summarizes the rheological properties of ring polymers and polymers containing intramolecular loops, which are currently being studied actively in terms of sample synthesis and physical property. The ring polymers, which have a well-defined molecular architecture and free of impurities, exhibit rheological properties that differ significantly from those of their linear counterparts. Notably, even minor contamination with linear chain impurities is known to substantially alter the rheological properties of ring polymers. Theoretical molecular modeling studies are being pursed to elucidate these behaviors. The ring polymer analogues consisting of multiple ring chains or intramolecular linkages between ring and linear chains exhibit either unentangled or intermolecular penetration behavior, depending on their molecular architectures. The polymers featuring intrinsically random intramolecular loops, such as single-chain polymeric nanoparticles (SCNPs) and polymeric nanosheets, are also under active investigation in terms of both their synthesis and properties. A deeper understanding of the molecular dynamics and rheological properties of these unique architectural polymers can contribute to the further development of polymer science and industry as well as to the creation of new polymeric nano-materials.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 4","pages":"283 - 294"},"PeriodicalIF":2.2,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875298","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}

{"title":"Nonlinear damping of associative polymers","authors":"Yuxuan Pei,&nbsp;Yanjie Zhang,&nbsp;Chengzhi Zheng,&nbsp;Jian Tang,&nbsp;Quan Chen","doi":"10.1007/s13367-024-00107-z","DOIUrl":"10.1007/s13367-024-00107-z","url":null,"abstract":"<div><p>Stress relaxation measurements under step strain γ are frequently utilized to characterize the nonlinear stress responses of polymeric materials. The reduction degree of the stress amplitude with increasing step strain is quantified by the so-called damping function, <i>h</i>(γ). In this review, we summarize a recent progress in molecular understanding of the damping behavior of associative polymers from both the experimental and theoretical perspectives. The damping is related to the rupture and reconstruction of associative network after applying step strain and before the terminal stress relaxation. Incorporation of this mechanism into the classic sticky Rouse model through the conformation pre-averaging protocol enables quantitative prediction of the damping behavior of randomly associating linear polymers as well as end-associative star polymers, both in the unentangled state.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 4","pages":"243 - 252"},"PeriodicalIF":2.2,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875246","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}