Korea-Australia Rheology Journal最新文献_第4页

Reptation theory-similar deep learning model for polymer characterization from rheological measurement 根据流变测量建立用于聚合物表征的重演理论--类似深度学习模型

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2024-04-10 DOI: 10.1007/s13367-024-00091-4

Javad Rahmannezhad, Heon Sang Lee

{"title":"Reptation theory-similar deep learning model for polymer characterization from rheological measurement","authors":"Javad Rahmannezhad, Heon Sang Lee","doi":"10.1007/s13367-024-00091-4","DOIUrl":"10.1007/s13367-024-00091-4","url":null,"abstract":"<div>The use of machine learning to predict rheological properties of polymers has great potential to facilitate the characterization of novel materials. Here, we have suggested the analogy between the double reptation (DR) and the deep neural network model. The double reptation model itself can be the special case of the deep learning method; linear activation function, and identical sets of weights for the two hidden layers are the characteristics of the double reptation model. The identical sets of weights in the double reptation model are related with the molecular weight distribution (MWD). We first generated ground truth data based on double reptation model. Then, we analyzed the dataset with reptation-guided deep neural network (RGDNN). We showed that the RGDNN model is available to determine entanglement molecular weight (plateau modulus), and monomeric friction factors from the simulated experimental rheological data (prepared using DR model) without any additional information. Overall, a noteworthy conceptual improvement in the determination of major factors that determine the rheological behavior of ultrahigh molecular weight polyethylene (UHMWPE) gels has been achieved.</div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 2","pages":"145 - 153"},"PeriodicalIF":2.2,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140588954","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

Deformation capacity of fresh cement pastes 新拌水泥浆的变形能力

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2024-04-09 DOI: 10.1007/s13367-024-00090-5

Y. El Bitouri

引用次数: 0

All-biomass-based strong nanocomposite fibers of agar and cellulose nanocrystals and their dye removal applications 基于全生物质的琼脂和纤维素纳米晶体强纳米复合纤维及其染料去除应用

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2024-03-27 DOI: 10.1007/s13367-024-00089-y

Youngeun Lee, Hyo Jeong Kim, Min Woo Kim, Jin Miyawaki, Han Gi Chae, Youngho Eom

{"title":"All-biomass-based strong nanocomposite fibers of agar and cellulose nanocrystals and their dye removal applications","authors":"Youngeun Lee, Hyo Jeong Kim, Min Woo Kim, Jin Miyawaki, Han Gi Chae, Youngho Eom","doi":"10.1007/s13367-024-00089-y","DOIUrl":"10.1007/s13367-024-00089-y","url":null,"abstract":"<div>Fiber-based commodities represent a substantial fraction of plastic waste, leading to environmental harm. Discarded sanitary masks and fishing equipment undergo degradation, generating microfiber plastics, thereby presenting a notable hazard to both human health and the ecosystem. In this study, mechanically strong and environmentally friendly nanocomposite fibers were prepared by dry-jet wet spinning. The all-biomass-based fibers comprised agar and cellulose nanocrystals (CNC) as the matrix and nanofiller, respectively, and were highly miscible in deionized water as a cosolvent. Based on rheological characterization, the optimal spinning concentration and temperature were set to 13% (w/v) and 95 °C, respectively. The dry-jet wet-spun agar-based fibers exhibited remarkable mechanical performance compared with previously reported agar-based materials. In particular, the 1 wt% CNC (with respect to the agar amount) simultaneously improved the Young’s modulus, strength, and toughness by 8.3, 4.8, and 16.4% (2.6 GPa, 93.5 MPa, and 7.8 MJ m−3), respectively, compared to those of the control agar fibers (2.4 GPa, 89.2 MPa, and 6.7 MJ m−3), overcoming the trade-off of stiffness-toughness for conventional nanocomposite systems. In addition, the agar/CNC nanocomposite fibers rapidly adsorbed Methylene blue within 90 min, which is significantly faster than that of the film-type agar adsorbent. Therefore, all-biomass-based agar/CNC fibers are a promising remedy for alleviating water pollution.</div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 2","pages":"109 - 118"},"PeriodicalIF":2.2,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140315977","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

Simulation of drop deformation and breakup in simple shear flow 模拟简单剪切流中液滴的变形和破裂

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2024-03-09 DOI: 10.1007/s13367-023-00085-8

Saeed Derakhshan, Ata Allah Kamyabi, Ali Mohebbi

{"title":"Simulation of drop deformation and breakup in simple shear flow","authors":"Saeed Derakhshan, Ata Allah Kamyabi, Ali Mohebbi","doi":"10.1007/s13367-023-00085-8","DOIUrl":"10.1007/s13367-023-00085-8","url":null,"abstract":"<div>The behavior of drops in the emulsion is significant in transport phenomena and the oil and the petrochemical industry. In this study, the behavior of drops that are close to each other was investigated. These drops were studied at two viscosity ratios (0.5 and 0.9, which are the viscosity ratio of drops to fluid) and six capillary numbers (0.05, 0.11, 0.17, 0.42, 0.28, and 0.36). The results demonstrate the effect of drops on each other at a range of volume fractions. Also, at capillary numbers of 0.42, 0.82, and 0.36, there were volume fractions at which drops stuck to each other and broke after combining. In contrast, the single drop at these new capillary numbers after merging was not broken. At the capillary number of 0.84, and volume fraction of 0.001495, the drops did not stick to each other, but they were broken under the influence of each other. For each capillary number, a specified volume fraction was achieved, at which the drops behave as a single drop. Therefore, in each capillary number, a volume fraction can be found so that in volume fractions less than that, drops behave individually and do not interact with each other.</div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 2","pages":"119 - 130"},"PeriodicalIF":2.2,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140099208","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

Rheological study on lower critical solution temperature behavior of organo-soluble cyano-substituted p-aramid in isotropic phase 各向同性相中有机可溶氰基取代对芳纶低临界溶液温度行为的流变学研究

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2024-03-08 DOI: 10.1007/s13367-024-00088-z

Hyo Jeong Kim, Yeamsuksawat Thanakorn, Dae Eon Jung, Youngho Eom

{"title":"Rheological study on lower critical solution temperature behavior of organo-soluble cyano-substituted p-aramid in isotropic phase","authors":"Hyo Jeong Kim, Yeamsuksawat Thanakorn, Dae Eon Jung, Youngho Eom","doi":"10.1007/s13367-024-00088-z","DOIUrl":"10.1007/s13367-024-00088-z","url":null,"abstract":"<div>Poly(2-cyano-p-phenylene terephthalamide) (CY-PPTA) has garnered significant interest as a promising precursor for super p-aramid fibers because of its organosolubility in N,N-dimethyl acetamide/lithium chloride (DMAc/LiCl) while conserving the superior properties of the resultant fibers. However, CY-PPTA has been reported to exhibit abnormal phase behavior owing to the strong dipole–dipole interactions induced by the cyano groups. Herein, we rheologically study the isotropic phases of CY-PPTA/DMAc solutions with respect to the concentration and temperature and compare them with those of CY-PPTA/sulfuric acid (H2SO4) solutions. In the isotropic region, the CY-PPTA solutions yield a higher power-law exponent of the dynamic viscosity (η') versus concentration of 6.0 (ηʹ ~ c6.0) in the DMAc system than that in H2SO4 (ηʹ ~ c3.2). Moreover, the CY-PPTA/DMAc solutions exhibit a lower critical solution temperature (LCST) behavior with increasing temperature, in contrast with the upper critical solution temperature in H2SO4. Consequently, the viscosity and exponent of the CY-PPTA/DMAc solutions increase at elevated temperatures. As shown by the Cole–Cole plot, the heterogeneity in the DMAc system becomes worse. The LCST of the CY-PPTA solution is ascribed to the intermolecular interactions between the highly polar cyano groups, which are negligible in H2SO4.</div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 2","pages":"89 - 97"},"PeriodicalIF":2.2,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140075096","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

A low-Reynolds-number k–ε model for polymer drag-reduction prediction in turbulent pipe flow 用于预测湍流管道流动中聚合物阻力降低情况的低雷诺数 k-ε 模型

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2024-02-17 DOI: 10.1007/s13367-024-00087-0

Yang Chen, Meiyu Zhang, A. R. Valeev, Changjun Li, A. M. Nechval, Peng Yang

{"title":"A low-Reynolds-number k–ε model for polymer drag-reduction prediction in turbulent pipe flow","authors":"Yang Chen, Meiyu Zhang, A. R. Valeev, Changjun Li, A. M. Nechval, Peng Yang","doi":"10.1007/s13367-024-00087-0","DOIUrl":"10.1007/s13367-024-00087-0","url":null,"abstract":"<div>Pipeline transport at high Reynolds number can result in significant turbulent losses. One of the most effective methods for turbulent drag reduction is adding a very small amount of polymer drag-reducing agent to the pipeline. However, due to the complex interaction between polymers and turbulence, turbulence models incorporating polymer additives remain to be studied and developed. In the present work, we investigated the turbulence model using Reynolds averaged numerical simulation (RANS) to describe polyacrylamide drag reduction flow. A low-Reynolds-number k–ε model in turbulent flow has been developed by considering the concentration and type of polymers, which can be applied for polymer drag reduction prediction in the pipe. Mean velocity profile Uf, turbulent intensity, turbulent kinetic energy k, and turbulent dissipation rate ε in the regions of viscous sublayer, buffer layer and logarithmic layer have been predicted with various concentration θ, Reynolds number Re, degradation degrees, and changing laws of these factors have been revealed with wall distance. The developed turbulence model showed a good capability to qualitatively forecast mean velocity profile, turbulent intensity, turbulent kinetic energy, and turbulent dissipation rate, and the prediction error between the experimental and simulated values falls along the y = x curve, which can be used for the investigation and prediction of varies water-soluble, oil-soluble polymers in turbulent drag reduction flow in pipes with other parameters such as pipe diameter, pipe length, and the Reynolds number.</div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 2","pages":"131 - 143"},"PeriodicalIF":2.2,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903902","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

Application of Post–Widder inversion formula to the calculation of relaxation spectrum from relaxation modulus 应用后维德反演公式从松弛模量计算松弛谱

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2024-02-02 DOI: 10.1007/s13367-023-00086-7

Gyuhyeon Cho, Jehyeok Choi, Junghaeng Lee, Kwang Soo Cho

引用次数: 0

Synthesis of bioadhesive PHEA hydrogels without crosslinkers through in situ polymerization and sustained mechanical mixing 通过原位聚合和持续机械混合合成不含交联剂的生物粘性 PHEA 水凝胶

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2024-01-16 DOI: 10.1007/s13367-023-00084-9

Seo Yoon Kim, Ji-Won Kang, Eun Hui Jeong, Taeho Kim, Ha Lim Jung, Jang-Ung Park, Jinhan Cho, Jun Dong Park, Byoung Soo Kim

{"title":"Synthesis of bioadhesive PHEA hydrogels without crosslinkers through in situ polymerization and sustained mechanical mixing","authors":"Seo Yoon Kim, Ji-Won Kang, Eun Hui Jeong, Taeho Kim, Ha Lim Jung, Jang-Ung Park, Jinhan Cho, Jun Dong Park, Byoung Soo Kim","doi":"10.1007/s13367-023-00084-9","DOIUrl":"10.1007/s13367-023-00084-9","url":null,"abstract":"This study presents a novel methodology for the fabrication of bioadhesives composed of poly(2-hydroxyethyl acrylate) (PHEA), which demonstrate superior mechanical properties. Hydrogels based on PHEA were effectively synthesized through a strategy that obviates the need for crosslinkers, utilizing in situ polymerization of high-concentration 2-hydroxyethyl acrylate (HEA) monomers under persistent agitation. Optimal operational conditions, such as polymerization duration and HEA monomer concentration, were screened through rheological evaluations. In addition, the introduction of glycerol to the PHEA hydrogels yielded improvements in water-retention capacity, thus resolving limitations frequently observed in conventional aqueous-based hydrogels. Tests assessing adhesive properties indicated that the PHEA hydrogels, synthesized without crosslinkers, exhibited exceptional adhesion capabilities that exceeded those of commercially available tissue sealants. This economically viable and readily scalable fabrication technique provides a compelling pathway for the creation of robust, biocompatible bioadhesives well-suited for biomedical utilization.","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 1","pages":"71 - 78"},"PeriodicalIF":2.2,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139476708","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

On the use of viscous micropumps for the transport of thixotropic fluids 利用粘性微型泵输送触变性流体

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-12-30 DOI: 10.1007/s13367-023-00083-w

M. Pourjafar-Chelikdani, M. Y. Heidari, A. Vakili, A. Abdollahi, A. Mahdavi Nejad, K. Sadeghy

{"title":"On the use of viscous micropumps for the transport of thixotropic fluids","authors":"M. Pourjafar-Chelikdani, M. Y. Heidari, A. Vakili, A. Abdollahi, A. Mahdavi Nejad, K. Sadeghy","doi":"10.1007/s13367-023-00083-w","DOIUrl":"10.1007/s13367-023-00083-w","url":null,"abstract":"<div>A cylinder rotating in an off-center position across a microchannel is known to generate a net flow for highly viscous Newtonian fluids. The mechanism is also known to be a viable option for the transport of viscoelastic or viscoplastic fluids albeit with a slight drop in performance. In the present work, the applicability of this mechanism is numerically investigated for the transport of (inelastic) time-dependent fluids obeying the structural-based Quemada model. By numerically solving the equations of motion, it is predicted that viscous micropumps can be used for the transport of thixotropic fluids although the obtained numerical results suggest that there exists a critical thixotropy number (a dimensionless number related to the fluid’s natural time) at which the flow rate is at its lowest value. It is shown that the critical thixotropy number can be avoided from the response of the fluid by properly choosing the geometrical parameters of the device. The general conclusion is that viscous micropumps can be deemed as an efficient mechanism for the transport of thixotropic fluids in microfluidic systems provided that the thixotropy number is sufficiently small, i.e., the fluid is strongly thixotropic. The device is predicted to be more suitable for anti-thixotropic fluids.</div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 1","pages":"55 - 69"},"PeriodicalIF":2.2,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139070421","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

Development and evaluation of dipalmitoyl phosphatidylcholine (DPPC) liposomal gel: rheology and in vitro drug release properties 二棕榈酰基磷脂酰胆碱（DPPC）脂质体凝胶的开发与评估：流变学和体外药物释放特性

IF 2.2 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-12-30 DOI: 10.1007/s13367-023-00082-x

Premanarayani Menon, Yin Yin Teo, Misni Misran

{"title":"Development and evaluation of dipalmitoyl phosphatidylcholine (DPPC) liposomal gel: rheology and in vitro drug release properties","authors":"Premanarayani Menon, Yin Yin Teo, Misni Misran","doi":"10.1007/s13367-023-00082-x","DOIUrl":"10.1007/s13367-023-00082-x","url":null,"abstract":"<div>Liposomes have emerged as pivotal entities in the field of therapeutics, particularly in the domain of protein and vaccine administration. Hence, the development of novel liposomal formulations has garnered considerable interest. Liposomal delivery systems are considered advantageous as medication carriers, especially in the field of dermatology, owing to their moisturizing and restorative characteristics. Nevertheless, a significant drawback in the utilization of liposomes in topical applications is the inherent fluidity of the formulation, which might result in leakage following delivery to the skin surface. The use of liposomes inside the gel matrix, while maintaining the integrity of the vesicles, presents a potentially appealing method for topical administration. The primary objective of this work is to develop a liposomal-loaded gel formulation and assess its in vitro release characteristics as well as its rheological profile, including viscoelastic properties and flow behaviour. This study incorporated two different types of drugs, namely hydrophilic (specifically diphenhydramine hydrochloride) and hydrophobic (namely curcumin), inside its formulations. A liposome, composed of a long alkyl chain lipid such as DPPC with a chain length of 16, was synthesized using the thin film hydration process and subsequently integrated into a carbopol gel. It is noteworthy that the introduction of diphenhydramine hydrochloride (DPH) resulted in a substantial decrease in the elastic modulus and cohesiveness of the liposomal gel. Conversely, the incorporation of curcumin-loaded liposomal gel led to an increase in critical strain and cohesiveness when compared to the plain liposomal gel. In contrast, the liposomal gel containing DPH and curcumin demonstrated a reduced release rate compared to the plain liposomal gel, spanning a duration of 48 h. The in vitro release studies offer the potential for the utilization of liposomal gels as a sustained delivery system.</div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"36 1","pages":"45 - 54"},"PeriodicalIF":2.2,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139069814","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