Article
Engineering, Chemical
Jianping Zhang, Jiaqi Wang, Peng Che, Youqi Wang, Zhiyao Lu, Zibing Qu
Summary: This study established a theoretical model with mechanics-electric-magnetic coupling to simulate the collection efficiency of magnetic confinement electrostatic cyclone precipitator (ECP) under different working voltages and explored the influence of magnetic flux intensity on the removal performance of submicron particles. The results showed that the introduction of magnetic field and electric field greatly reduced the number of particles escaped from the cyclone, indicating that charging effect and magnetic confinement are conducive to trap submicron particles in the internal vortex ECP. The research results can provide a practical new idea for the innovative design of ECP.
Article
Engineering, Chemical
Jianping Zhang, Jiaqi Wang, Peng Che, Youqi Wang, Zhiyao Lu, Zibing Qu
Summary: A theoretical model with mechanics-electric-magnetic coupling was established to improve the capture performance of internal vortex electrostatic cyclone precipitator (ECP). The simulation results showed that magnetic confinement and charging effect contributed to trapping submicron particles in the ECP. The research provides a practical new idea for the innovative design of ECP.
Article
Chemistry, Multidisciplinary
Tongtao Li, Angang Dong, Siyu Wan, Xiangyun Xi, Heyang Zhang, Jing Ning, Ziyue Zheng, Zhebin Zhang, Ying Long, Yuwei Deng, Pengshuo Fan, Dong Yang
Summary: This contribution describes the self-assembly of colloidal nanodumbbells (NDs) with tunable shapes within cylindrical channels. The intrinsic concave geometry of NDs endows them with peculiar packing and interlocking behaviors, leading to a variety of super-structures. A mechanistic investigation reveals that the phase behavior of NDs under strong confinement can be rationalized by the entropy-driven maximization of the packing efficiency. An empirical phase diagram is generated based on the experimental results, which could provide general guidance in the design of intended superstructures from NDs. This study provides essential insight into how the interplay between the particle shape and confinement conditions can be exploited to direct the orientationally ordered assembly of concave nanoparticles into unusual superlattices.
Article
Engineering, Civil
Javad Shayanfar, Joaquim A. O. Barros, Mohammadali Rezazadeh
Summary: This paper develops a new analysis-oriented model for fully and partially confined RC columns under compression. The model takes into consideration the influence of concrete expansion distribution and combines FRP strips and steel transverse reinforcements for confinement. The model considers the influence of partially imposed confinement strategy on the axial and dilation behavior of RC columns and is validated through experimental simulations.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
I. A. Tijani, Cheng Jiang, C. W. Lim, Yu-Fei Wu
Summary: The study extends a theoretical model for the mechanical behavior of eccentrically loaded concrete under nonuniform confinement, verifying and developing its applicability and modification through test results. The results show good accuracy and agreement between theoretical predictions and actual tests.
JOURNAL OF STRUCTURAL ENGINEERING
(2022)
Article
Polymer Science
Jinseong Kim, Jun Mo Kim, Chunggi Baig
Summary: The study resolves the controversial issue regarding the structures of confined polymer systems through atomistic and coarse-grained molecular dynamics simulations. The findings provide basic guidelines for future theoretical and experimental analyses of two-dimensional or narrowly confined polymeric systems.
Article
Chemistry, Physical
C. K. Sarika, Sayantan Majumdar, A. K. Sood
Summary: This study investigates the flow behavior of ultra-dilute fractal suspensions and reveals a direct transition from flowing to a shear jammed state. The research uncovers the fragility and contact dynamics unique to fractal suspensions and proposes a generic phase diagram to describe this transition.
Article
Biochemical Research Methods
Yang Bu, Sheng Ni, Levent Yobas
Summary: Ordered surface crack patterns were discovered in microfluidic channels/chambers in PDMS, formed in situ under compression after an oxygen plasma step in soft lithography. The crack patterns are visible only after fluorescent labeling, and vary with fluidic layout and material compliance.
Article
Construction & Building Technology
Julian Thamboo, Satheeskumar Navaratnam, Keerthan Poologanathan, Marco Corradi
Summary: Timber is re-emerging in construction due to its sustainability and aesthetic features. An experimental campaign was carried out to characterize the confined behavior of timber under triaxial stress state. The results demonstrate that confinement pressure improves the strength and ductility of timber.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Bao Jin, Guangyan Chen, Yongyong He, Chenhui Zhang, Jianbin Luo
Summary: This review extensively explores and summarizes the lubrication properties of graphene materials under harsh working conditions, as well as its effect on the behavior of boundary tribofilm. The lubrication mechanisms of graphene are summarized, and the future prospects and challenges for its application as next-generation lubrication materials are discussed.
MATERIALS TODAY ADVANCES
(2023)
Article
Construction & Building Technology
S. Adafer, Y. Si Youcef, S. Amziane
Summary: This research investigates the cyclic behaviour of externally strengthened concrete with carbon fibre reinforced polymer composites (CFRP) through experimental tests. The results show that confinement has a positive effect on strength and deformability, especially in cylindrical specimens. The residual strain and stiffness degradation are independent of the confinement rate, while the dissipated and restored energies are significantly affected by increasing number of CFRP layers. Furthermore, the variation of the dissipated energy, restored energy, and damage capacity consists of two successive phases.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Environmental
Haoran Song, Daoyuan Zu, Changping Li, Rui Zhou, Yuwei Wang, Wei Zhang, Shiting Pan, Yang Cai, Zhuo Li, Yongming Shen, Jun Ma
Summary: This study achieved ultrafast activation of peroxymonosulfate by reduction of trace Fe3+ at the μg L-1 level using eco-friendly Ti3C2 MXene under neutral and alkaline conditions. Complete removal of the model pollutant sulfamethoxazole was accomplished within minutes, with hydroxyl and sulfate radicals identified as the primary reactive species. The strong reducibility of Ti3C2 MXene played a key role in triggering the Fe(III)/Fe (II) cycle and accelerating PMS activation, leading to excellent performance in the Fenton-like process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Multidisciplinary Sciences
Jiamin Yuan, Zhiqiang Liu, Yimo Wu, Jingfeng Han, Xiaomin Tang, Chengbin Li, Wei Chen, Xianfeng Yi, Jian Zhou, Rajamani Krishna, German Sastre, Anmin Zheng
Summary: Contrary to the general trend, the movement of long-chain molecules slows at higher temperatures under confinement due to the thermal resistance effect. This phenomenon limits molecular transportation in nanoscale channels, as confirmed by zero length column experiments. This study contributes to our understanding of anomalous diffusion and its mechanisms in confined systems.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Engineering, Geological
Ashkan Rastegarmanesh, Ali Mirzaghorbanali, Kevin McDougall, Naj Aziz, Sina Anzanpour, Hadi Nourizadeh, Mahdi Moosavi
Summary: This research study experimentally investigated the axial load transfer mechanisms of six cable bolts. The results showed that the radial stiffness of the samples significantly affected the overall load of the system, while rotation had limited influence on the load behavior of the tested samples.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Polymer Science
Sanchayan Pal, Rajiv K. Srivastava, Bhanu Nandan
Summary: This study investigates the confined crystallization behavior of poly(ethylene oxide) (PEO) and poly (butylene adipate) (PBA) in electrospun nanofibers. The results show that despite the close melting temperature of PEO and PBA, faster crystallization kinetics of PEO leads to the entrapment of PBA in the intra-spherultic regions of PEO, resulting in further crystallization under hierarchical confinement.
Article
Multidisciplinary Sciences
Javier Diaz, Marco Pinna, Andrei Zvelindovsky, Ignacio Pagonabarraga
Summary: This study uses 2D and 3D mesoscopic simulations to explore the phase behavior of block copolymer/nanoparticle systems, finding that the anisotropic ordered nanoparticles can enhance the lamellar phase of block copolymers and induce a phase transition. Anisotropic nanoparticles within circular-forming block copolymers lead to a competition between nematic colloidal ordering and hexagonally ordered mesophases.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Mechanics
Elfego Ruiz-Gutierrez, Steven Armstrong, Simon Leveque, Celestin Michel, Ignacio Pagonabarraga, Gary G. Wells, Aurora Hernandez-Machado, Rodrigo Ledesma-Aguilar
Summary: In this study, we investigate the duration of the cross-over between the initial linear growth and the diffusive-like growth in spontaneous capillary imbibition. We find that local-resistance sources, such as inertial resistance and friction caused by the advancing meniscus, always limit the motion of the imbibing front. Our results show that this cross-over is much longer than previously thought, even longer than the time it takes for the liquid to fill the porous medium. This slowly slowing-down dynamics is likely to cause similar long cross-over phenomena in processes governed by wetting.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Physics, Multidisciplinary
Matteo Paoluzzi, Demian Levis, Ignacio Pagonabarraga
Summary: This study investigates the transition between glassy and fluid states in dense active materials, revealing that the mechanisms leading to fluidization in active systems do not have an equilibrium counterpart.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Physical
Shan Chen, Zhenjiang Guo, Hongguang Zhang, Ignacio Pagonabarraga, Xianren Zhang
Summary: In this study, molecular dynamics simulations are used to reveal the characteristics and changes induced by plug flow at the nanoscale. The flow behavior of the liquid shows different friction intensity and liquid/solid interaction compared to macroscopic situations.
EUROPEAN PHYSICAL JOURNAL E
(2022)
Article
Chemistry, Physical
Lucas S. Palacios, Andrea Scagliarini, Ignacio Pagonabarraga
Summary: We introduce a novel mesoscopic computational model based on a multiphase-multicomponent lattice Boltzmann method for the simulation of self-phoretic particles in the presence of liquid-liquid interfaces. Our model features fully resolved solvent hydrodynamics and can handle important aspects of the multiphysics of the problem.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Sergi G. Leyva, Ralph L. Stoop, Ignacio Pagonabarraga, Pietro Tierno
Summary: In this study, we demonstrate the significant impact of the dispersing medium on the collective dynamics of interacting Brownian particles in a ratchet transport system. The long-range hydrodynamic interactions (His) result in a speed-up effect, leading to a higher translational speed and the formation and growth of clusters perpendicular to the driving direction. This research sheds light on the role of the dispersing medium in the dynamics of driven colloidal matter and the morphology of clusters.
Article
Chemistry, Physical
Marco De Corato, Ignacio Pagonabarraga
Summary: This paper investigates the self-propulsion mechanism of chemically active colloids and their coupling relationship with chemical reactions and momentum transport. By studying Onsager reciprocal relations, it is found that if a chemical reaction drives the motion of the colloid, an external force generates a reaction rate. The validity of reciprocal relations is verified through numerical simulations, and the key role of solute advection in maintaining the symmetry of the Onsager matrix is highlighted. Furthermore, it is discovered that Onsager reciprocal relations break down under nonequilibrium steady states, which has implications for the thermal fluctuations of active colloids used in experiments.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Elena Sese-Sansa, Demian Levis, Ignacio Pagonabarraga
Summary: This article discusses a dynamical field theory for self-propelled particles subjected to generic torques and forces. By coarse-graining their microscopic dynamics, the study investigates the instabilities of macroscopic and finite structures, and the influence of intrinsic torques on phase separation and non-equilibrium patterns.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
C. Rorai, F. Toschi, I. Pagonabarraga
Summary: In active nematic liquid crystals, activity can drive chaotic flows known as active turbulence. Experimental and theoretical studies have characterized active turbulence as a low Reynolds number phenomenon. In two dimensions, it has been shown that active forcing alone can trigger hydrodynamic turbulence, resulting in the coexistence of active and inertial turbulence.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Paolo Malgaretti, Jens Harting
Summary: In the past decade, the Fick-Jacobs approximation has been used to study transport across constrictions. This paper reviews the derivation of the Fick-Jacobs equation with a focus on its linear response regime. It is found that for fore-aft symmetric channels, the flux of noninteracting systems can be fully captured by the linear response regime. A simple formula is derived for this case, which accurately captures the trends and can be used as a tool for experiment design and simulations. Furthermore, it is shown that higher-order corrections in the flux may arise for nonsymmetric channels.
Article
Chemistry, Physical
Joan Codina, Helena Massana-Cid, Pietro Tierno, Ignacio Pagonabarraga
Summary: Investigated the directed motion in clusters composed of passive and catalytically active particles and explained the reversal in transport direction using a theoretical model. Further built complex architectures capable of rapid assembly and disassembly under light control.
Article
Chemistry, Physical
Elena Sese-Sansa, Guo-Jun Liao, Demian Levis, Ignacio Pagonabarraga, Sabine H. L. Klapp
Summary: We present a hydrodynamic theory for systems of dipolar active Brownian particles and verify the theory's predictions of motility-induced phase separation (MIPS) with Brownian dynamics simulations. The simulations show that dipolar interactions hinder MIPS, and the analysis of angle-dependent correlation functions reveals the microscopic mechanisms behind the destabilization of the homogeneous phase.
Review
Polymer Science
Javier Diaz, Marco Pinna, Andrei V. Zvelindovsky, Ignacio Pagonabarraga
Summary: Block copolymer melts are excellent for positioning colloidal nanoparticles at the nanoscale and have wide applications in lithography. They can self-assemble into ordered structures where nanoparticles segregate based on polymer-particle interactions, size, and shape. The combination of the time-dependent Ginzburg-Landau model and Brownian dynamics provides an efficient mesoscopic model for studying block copolymer nanocomposites. This review focuses on recent developments and applications of this model.
Article
Chemistry, Physical
Javier Diaz, Marco Pinna, Andrei Zvelindovsky, Ignacio Pagonabarraga
Summary: Block copolymer nanocomposites with anisotropic nanoparticles can form complex structures with aligned nanoparticles. These anisotropic nanoparticles can induce a phase transition from sphere to cylinder by modifying the morphology of the block copolymer. Additionally, controlling the orientation of the nanoparticles can further control the global orientation of the block copolymer.
Article
Chemistry, Physical
Javier Diaz, Marko Soltau, Martin Lisal, Paola Carbone, Ignacio Pagonabarraga
Summary: The homogeneous covering of amphiphilic polymer molecules on metallic surfaces plays a crucial role in corrosion inhibitor applications. Sorption and conformation behavior of amphiphilic grafted polymers for corrosion inhibition are studied using coarse-grained simulations. The solubility of the backbone is found to be a key factor in determining the sorption and conformation behavior, with moderate solubility achieving optimal surface coverage.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
