Article
Mechanics
Rodrigo S. Mitishita, Jordan A. MacKenzie, Gwynn J. Elfring, Ian A. Frigaard
Summary: Research on turbulent flows of high Reynolds number viscoplastic fluids has been conducted, and an experimental study was carried out to investigate the effect of different concentrations of Carbopol on the rheology and turbulence statistics of the fluid.To increase Reynolds number with a Carbopol solution, streamwise Reynolds stresses approach Newtonian values in the core, suggesting diminishing effects of shear-thinning. The addition of Carbopol enhances turbulence anisotropy and alters energy content at different scales in comparison to water.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2021)
Article
Mechanics
A. Pourzahedi, M. Zare, I. A. Frigaard
Summary: Bubbles rising steadily in Carbopol often have an inverted teardrop shape with a pointed tail, which may be caused by viscoelasticity or fluid memory effects. Even after eliminating all possibilities of memory effects, the pointed tail still exists in steady bubble propagation. This suggests that the tail shape results from a combination of rheology and steady fluid deformation around the rising bubble.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2021)
Article
Physics, Fluids & Plasmas
Dmytro Kushnir, Celine Ruscher, Eckhard Bartsch, Fabrice Thalmann, Pascal Hebraud
Summary: The mechanical nonlinear response of dense Brownian suspensions of polymer gel particles is investigated experimentally and through numerical simulations. The response of the suspension depends on its previous history, including flow starting from a static state and flow reversal. Numerical simulations reveal a delay between the anisotropy of the local microstructure and the macroscopic stress.
Article
Polymer Science
N'dri Arthur Konan, Eilis Rosenbaum, Mehrdad Massoudi
Summary: In this study, the boundary-layer flow of a Herschel-Bulkley fluid due to a moving plate is investigated. Computational fluid dynamics and regularization methods are used to solve the governing equations numerically. The results show good agreement between simulations and experimental data, with accurate prediction of boundary layer thicknesses and strong sensitivities to the rheological properties of the fluid.
Article
Chemistry, Multidisciplinary
Nicola Antonio Di Spirito, Shadi Mirzaagha, Ernesto Di Maio, Nino Grizzuti, Rossana Pasquino
Summary: This study investigates the dynamics of bubble rupture and hole opening in a non-Newtonian fluid by analyzing the retraction process of thin films after inflation. A new mathematical model is proposed to understand the opening velocity, taking into account various forces such as viscous, elastic, surface, and inertial forces. Experimental results show good agreement between the predicted opening velocity using the proposed model and the actual measurements.
Article
Polymer Science
Cuong Mai Bui, Anh-Ngoc Tran Ho, Xuan Bao Nguyen
Summary: This study numerically investigates the flow behavior of polymers in a lid-driven cavity, inspired by the coating process, over a wide range of Oldroyd numbers (0 <= Od <= 50). The results show that the flow characteristics of polymers, such as velocity, viscosity, and vortex distributions, are significantly influenced by viscoplastic behaviors. Additionally, solid-like regions are observed in the flow patterns, and their size increases and tends to merge together as Od increases. The cavity width/aspect ratio and skewed angle also have significant impacts on the vortex structures and the formation of solid-like regions.
Article
Mechanics
Eliane Younes, Michal Himl, Zdenek Stary, Teodor Burghelea
Summary: This study presents an in-situ visualization of the microstructure of a Carbopol gel flowing in a micro-channel using a novel chemical protocol to stain solid material units. By accurately identifying the solid/fluid material units advected by confined microscopic flow, the study reports a full statistical description of their distributions in terms of space and time averages, probability density functions, and space-time correlations for the first time.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2021)
Article
Construction & Building Technology
Kousalya Ramachandran, Ponmalar Vijayan
Summary: This study investigates the synergistic impact of a ternary binder composed of beta-hemihydrate, clinkers, and slag. The results show that the incorporation of slag and clinkers significantly improves the rheological performance and compressive strength of the binder, and leads to the formation of various hydration products.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Mechanics
Jayesha S. Jayaratne, Sarah L. Codd, Rehab N. Al-Kaby, Josephine Maley, Timothy I. Brox, Petrik Galvosas, Joseph D. Seymour
Summary: This study utilizes Rheo-NMR velocimetry to measure the spatial velocity distribution during large amplitude oscillatory shear (LAOS). The measurement provides time dependent spatially resolved local velocity time series, which show distinct features dependent on material response.
Article
Engineering, Chemical
Fan Liu, Jin Wang, He Zhang, Xiaohu Yao
Summary: This paper employed an elastic-plastic constitutive model to predict and analyze the stress relaxation of a glassy polymer. It was found that the model accurately predicted pre-yield stress relaxation but underestimated post-yield stress relaxation. To address this issue, the model was extended to incorporate an additional structural relaxation mechanism originating from the dissociation of weak linkages in the chain network. The extended model successfully explained both the yield/flow and stress relaxation behaviors throughout the deformation region, and the reasons behind it were analyzed. The knowledge revealed in this paper is instructive and may provide new insights into understanding the structural relaxation and mechanical behavior of glassy polymers.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Weijian Hua, Kellen Mitchell, Lasith S. Kariyawasam, Changwoo Do, Jihua Chen, Lily Raymond, Naima Valentin, Ryan Coulter, Ying Yang, Yifei Jin
Summary: This study proposes a concept of stimuli-responsive yield-stress fluids with an interactive dual microstructure for use as support bath materials in 3D printing. By utilizing a yield-stress additive and stimuli-responsive polymers, the fluids are able to switch between different states at varying stresses and exhibit regulable rheological properties when exposed to external stimuli. The printing capability of these fluids is validated through the successful fabrication of various complex structures, demonstrating their potential for manufacturing arbitrary architectures.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Weijian Hua, Kellen Mitchell, Lasith S. Kariyawasam, Changwoo Do, Jihua Chen, Lily Raymond, Naima Valentin, Ryan Coulter, Ying Yang, Yifei Jin
Summary: This study proposes the concept of stimuli-responsive yield-stress fluids with an interactive dual microstructure as support bath materials. The fluid can switch states at different stresses and regulate its rheological properties based on external stimuli, enabling the addition and removal of support bath materials during printing. By studying a nanoclay-Pluronic F127 nanocomposite, the interactions and microstructure evolutions at different stresses are investigated. Three representative 3D structures are successfully printed to validate the printing capability of the fluid.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Biotechnology & Applied Microbiology
Nesrine Bouhrira, Brandon J. DeOre, Peter A. Galie
Summary: This study aims to mimic physiological flow using a low-cost method and investigate the impact of flow separation on velocity and shear stress profiles in a three-dimensional structure. Experimental and computational simulations reveal periodic changes in shear stress and flow separation zones in the flow dynamics.
BIOTECHNOLOGY AND BIOENGINEERING
(2021)
Article
Physics, Fluids & Plasmas
Han Zhang, Phong Pham, Bloen Metzger, Dmitry I. Kopelevich, Jason E. Butler
Summary: The diffusivity of non-Brownian and neutrally buoyant spheres in a viscous fluid was measured under shear. Roughened particles were compared to original particles, and contrary to expectations, the rougher particles had lower diffusivity for volume fractions over 0.25. Simulations revealed that increased roughness can lead to particle organization in layered structures at high volume fractions, resulting in fewer collisions and decreased diffusivity. The effect of roughness on diffusivity was disrupted by using a polydisperse distribution of particle sizes.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Mechanics
Santosh Kumar Jena, Tushar Srivastava, Supreet Singh Bahga, Sasidhar Kondaraju
Summary: In a T-junction microchannel, the channel width has a significant impact on droplet generation, affecting both droplet size and frequency. This study extends a previous model to account for the varying width ratio between the dispersed and continuous phase channels. Experimental results validate the proposed scaling law and show that an increase in the width of the continuous phase channel leads to an increase in droplet length but a decrease in droplet production frequency. Similar behavior is observed with variations in the width of the dispersed phase channel. Overall, this research provides new insights into the effect of channel width on droplet length and frequency.
Article
Chemistry, Physical
Panpan Zhang, Xu Wang, Yangyang Yang, Haifeng Yang, Chunsheng Lu, Mingru Su, Yu Zhou, Aichun Dou, Xiaowei Li, Xiaochuan Hou, Yunjian Liu
Summary: In this study, the influence of transition metal doping on the electronic and mechanical properties and electrochemical performance of 2HMoS2/NC was investigated using Cobalt (Co) as an example. Co doping was found to effectively improve the electronic conductivity and active site areas of 2H-MoS2/NC at different positions, optimizing the adsorption and diffusion capability of potassium ions. Furthermore, the study revealed the optimal roles of different types of nitrogen atoms in kinetic adsorption, diffusion, and interfacial stability of potassium ions. These findings provide guidance for the experimental design of high rate 2H-MoS2/NC electrode materials and the optimal design of other functional composite materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zeeshan Ajmal, Mahmood Ul Haq, Shahid Zaman, M. K. Al-Muhanna, Anuj Kumar, Mohammed M. Fadhali, Siwar Ben Hadj Hassine, Muhammas Qasim, K. F. Alshammari, Ghulam Abbas Ashraf, Abdul Qadeer, Adil Murtaza, Sulaiman Al-Sulaimi, Huaqiang Zeng
Summary: This study presents a novel heterojunction structure (SrTiO3/CN-TAL10.0) for enhanced photocatalytic water splitting (PWS). The incorporation of thiophenedicarboxaldehyde (TAL) through copolymerization significantly improves the photocatalytic activity of carbon nitride (CN) while maintaining its photostability performance. The optimized composition allows efficient isolation of photoinduced charge carriers and enhanced charge transport, resulting in a remarkable increase in overall photocatalytic efficiency.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Angela Arnosa-Prieto, Patricia Diaz-Rodriguez, Manuel A. Gonzalez-Gomez, Pelayo Garcia-Acevedo, Lisandra de Castro-Alves, Yolanda Pineiro, Jose Rivas
Summary: Macrophages can exhibit different phenotypes depending on the microenvironment and the characteristics of magnetic iron oxide nanoparticles (MNPs). This study demonstrates that the concentration and morphology of MNPs can influence the polarization of macrophages. The findings have implications for therapeutics targeting tissue regeneration and tumor progression.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yu Fang, Cheng-Ye Zhu, Hao-Cheng Yang, Chao Zhang, Zhi-Kang Xu
Summary: This study demonstrates the advantages of vacuum-assisted interfacial polymerization (VAIP) in fabricating polyimide nanofiltration membranes. By using vacuum filtration, aqueous solutions of PIP can be evenly distributed on different microfiltration substrates, leading to the fabrication of uniform and ultra-thin polyamide layers with excellent performance. The membranes exhibit high rejection rates and water permeance, as well as satisfactory long-term stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Isaac J. Gresham, Edwin C. Johnson, Hayden Robertson, Joshua D. Willott, Grant B. Webber, Erica J. Wanless, Andrew R. J. Nelson, Stuart W. Prescott
Summary: Understanding the interactions between polymers and surfactants is crucial for optimizing commercial systems. This study tested the behavior of polymer-surfactant systems, revealing that they do not behave like polyelectrolytes in the presence of salt. Additionally, the structure of polymer-surfactant complexes under confinement differs from that of polyelectrolytes.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yunxiao Xie, Cui Liu, Jie Zhang, Yan Li, Bin Li, Shilin Liu
Summary: This study aimed to improve the microstructure and rheological properties of W/W Pickering emulsions by crosslinking sodium alginate at the water-water interface, thereby enhancing the activity of encapsulated probiotics in simulated gastrointestinal digestion.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Sang Ho Lee, Yige Sun, Patrick S. Grant
Summary: This research developed an effective approach to enhance the charging rates of lithium ion batteries (LIBs) by strategically incorporating carbon nanotube (CNT) conductivity boosters into Li4Ti5O12 (LTO) electrodes. Multi-layer architectures comprising CNT-rich and CNT-free LTO electrode layers were manufactured using a layer-by-layer spray coating method to promote charge transfer kinetics of high mass loading electrodes. The best performing multi-layer was paired with a spray-coated LiFePO4 (LFP) positive electrode, resulting in attractive power performance that outperformed conventional LTO || LFP combinations.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jingwei Liang, Shaobin Li, Fengbo Li, Li Zhang, Yufeng Jiang, Huiyuan Ma, Kun Cheng, Liang Qing
Summary: A molybdenum-regulated self-supporting electrode material with rich vacancy defects has been successfully synthesized and shows exceptional catalytic activities and stability for electrocatalytic overall water splitting. This study provides a new perspective for the design and synthesis of non-precious metal bifunctional electrocatalysts.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Jonas Blahnik, Jennifer Schuster, Rainer Mueller, Eva Mueller, Werner Kunz
Summary: This study investigates the relationship between the morphology of PMMA monopolymers and PMMA-PHEMA copolymers with the expected nature of surfactant-free microemulsions (SFMEs) before polymerization. It is found that previously mesostructured, surfactant-free mixtures can produce porous polymers of different morphologies, while unstructured, oil-rich regions lead to solid, transparent polymers without nanostructured morphologies. Additionally, a surfactant-based reference system shows similar phase behavior and polymer morphologies as the comparable surfactant-free system, indicating the importance of the hydrotropic behavior of HEMA in this system.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Zheng-Fen Pu, Wen-Zhi She, Rong Sheng Li, Qiu-Lin Wen, Bi-Chao Wu, Chun-Hua Li, Jian Ling, Qiue Cao
Summary: This study synthesized two framework-isomeric covalent organic frameworks (COFs) and discovered that the light scattering signal of COFs can be used for the analytical detection of lead ions. By controlling synthesis conditions and introducing regulators, the morphology of COFs could be controlled and framework-isomeric COFs could be precisely synthesized.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Yuchen Weng, Ying Hong, Jingyu Deng, Sicheng Cao, Li-Juan Fan
Summary: This paper reports the preparation of dynamic color-changing fluorescent polymer nanoparticles (PNPs) by constructing a fluorescence resonance energy transfer (FRET) pair. The PNPs show excellent anti-counterfeiting effects and reproducibility. The study demonstrates a promising encryption strategy that can achieve multiple outputs with simple operation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Guodong Liu, Zijian Wang, Jianing Wang, Hanbin Liu, Zhijian Li
Summary: This study investigates the combination of multicolor switchable polyaniline (PANI) electrode and 1-methyl-4,4'-bipyridyl iodide (MBI), which demonstrates superior optical properties in visible and near-infrared light modulation, as well as excellent electrochemical performances. This combination can be used to develop novel electrochromic devices for applications in smart packaging, smart labels, and flexible smart windows.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Huying Yan, Yang Guo, Xingzhi Bai, Jiawei Qi, Haipeng Lu
Summary: By modifying Ti3C2Tx through heterogeneous interface engineering, optimized impedance matching is achieved, leading to enhanced electromagnetic wave absorption performance.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Kehu Zhang, Yang Zhou, Silvia Moreno, Simona Schwarz, Susanne Boye, Brigitte Voit, Dietmar Appelhans
Summary: This article presents an advanced crosslinking strategy to fabricate clustered polymersomes using host-guest interactions. By controlling the input of crosslinker and environmental conditions, reversible aggregation and disassembly of these polymersomes can be achieved. The size and structure of these clustered polymersomes can be regulated and visualized through a fluorescent enzymatic cascade reaction.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Chemistry, Physical
Junjie Xu, Weixiong Huang, Ruiling Li, Li Li, Jinjin Ma, Jiaou Qi, Haiyan Ma, Min Ruan, Lilin Lu
Summary: In this study, a potassium doped palladium catalyst was developed for acetylene hydrogenation, showing excellent catalytic performance and durability. The doping of potassium effectively weakened the adsorption of ethylene, improved ethylene selectivity, and lowered the barriers of hydrogen activation and transfer reactions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)