Review
Biotechnology & Applied Microbiology
Yating Mao, Paige Nielsen, Jamel Ali
Summary: Microrheology is a method for measuring the mechanical properties of soft materials by characterizing the motion of microscopic particles. It extends the range of conventional bulk rheology and has advantages such as eliminating the need for large sample sizes and obtaining spatiotemporal information. It has significant applications in understanding structurally complex fluids in biomedical systems.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Austin Hopkins, Michael Chiang, Benjamin Loewe, Davide Marenduzzo, M. Cristina Marchetti
Summary: The rheology of biological tissue is important in various processes, and this study uses a multiphase field model to simulate the microrheology within a tissue monolayer. The results show that the tissue undergoes a transition between solid and fluid states when perturbed, and the onset of motion varies with deformability.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mechanics
Pouria Nourian, Rafikul Islam, Rajesh Khare
Summary: The study identified eight conditions for the successful implementation of probe rheology technique in molecular simulations, with the two most important being that the peak in the probe displacement should occur at the same frequency as the applied force, and that the magnitude of the external force driving the probe motion should be comparable to the hydrodynamic friction force experienced by the probe particle. The validity of the procedure was demonstrated by applying it to determine the viscoelastic properties of a weakly entangled polymer melt system.
JOURNAL OF RHEOLOGY
(2021)
Article
Chemistry, Physical
F. Orts, M. Maier, M. Fuchs, G. Ortega, E. M. Garzon, A. M. Puertas
Summary: The dynamics of a tracer particle in a bath of quasi-hard colloidal spheres is investigated using Langevin dynamics simulations and mode coupling theory. The study reveals that the size of the tracer particle has a significant impact on its motion, as well as on the dynamics of the bath particles.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Acoustics
Dae Hyuck Kim, Gil Ho Yoon
Summary: This research explores the application of additive manufacturing technology in active acoustic absorption device, aiming to test and utilize the anisotropic absorption coefficients of AM device caused by its anisotropic stiffness characteristics. The concept of an active acoustic device is proposed, and experiments are conducted to validate its effectiveness.
Article
Multidisciplinary Sciences
Simone Bello, Giusy Lavecchia, Carlo Andrenacci, Maurizio Ercoli, Daniele Cirillo, Filippo Carboni, Massimiliano R. Barchi, Francesco Brozzetti
Summary: Studying faults capable of releasing moderate-to-strong earthquakes is essential for understanding seismic hazard. A recent study in Italy's Campania-Lucania area discovered a 65 km-long, south-southwest dipping fault that may be responsible for the 1857 earthquake. The study also found similarities in the stress field direction with the neighboring Irpinia area, suggesting a deviation from the regional trend. This research demonstrates the importance of fieldwork and innovative data analysis techniques in uncovering unknown faults and providing valuable insights into earthquake activity.
SCIENTIFIC REPORTS
(2022)
Article
Polymer Science
Hugo A. Castillo-Sanchez, Leandro F. de Souza, Antonio Castelo
Summary: In this study, complex rheological behavior is described using models implemented in the HiGTree/HiGFlow system. The models are successfully compared with two other methodologies, and the mesh convergence analysis shows the excellent performance of the HiGFlow software. Importantly, the implemented methodology reproduces rheological behavior of high interest in the rheology community.
Article
Engineering, Electrical & Electronic
Vincent Gauthier, Emmanuel Caplain, Stephane Serfaty, Magalie Michiel, Pascal Griesmar, Nicolas Wilkie-Chancellier
Summary: This paper presents a multifrequency technique to investigate the evolution of soft matter at mesoscopic scale and its relationships with other scales. A TMS resonator is used as an ultrasonic microrheometer to measure mechanical impedance and monitor the effective viscosity and internal structure simultaneously. The technique is validated with different complex materials, and the extracted structural parameter can be linked to fractal dimension.
IEEE SENSORS JOURNAL
(2022)
Article
Multidisciplinary Sciences
Christopher Gorski, Yuval Mazor
Summary: This protocol describes a method to isolate and study Photosystem I (PSI) and its antenna complex, Light Harvesting Complex I (LHCI), from plants. PSI-LHCI is a large membrane protein complex that plays a crucial role in light harvesting and electron transport in photosynthesis. The protocol involves homogenization of plant tissue, separation of chloroplasts, lysis of chloroplasts to recover thylakoid membranes, solubilization of thylakoid membranes, and purification of chlorophyll-containing complexes using anion exchange and sucrose gradient centrifugation. The resulting fractions are characterized to identify and study the PSI-LHCI complex. This protocol is based on previous methods developed in the lab of Nathan Nelson and provides a simplified approach for isolating and studying PSI-LHCI.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2023)
Article
Chemistry, Physical
Diemo Renz, Marvin Cronau, Bernhard Roling
Summary: A novel AFM-based technique was presented for determining the Li diffusion coefficient of single active material particles in composite electrodes. The results showed a Li ambipolar diffusion coefficient of 8 X 10(-13) cm(2)/s for a single LiCoO2 particle inside a composite electrode, in good agreement with results obtained from other measurement methods.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Electrical & Electronic
Osama M. Hebala, Ahmed A. Aboushady, Khaled H. Ahmed, Ibrahim Abdelsalam, Samuel J. Burgess
Summary: This article introduces a new controller for power regulation in dual active bridge (DAB) dc-dc converter that tracks minimum RMS current for minimum losses. The controller is based on perturb and observe (P&O) tracking method, embedded in a closed-loop control scheme to regulate active power in DAB converter. The proposed controller does not require complex nonlinear converter modeling and is not circuit parameter dependent.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Mathematics, Applied
Mohammad Sajid, Harindri Chaudhary, Santosh Kaushik
Summary: This paper primarily investigates the methodology for hybrid complex projective synchronization (HCPS) scheme in non-identical complex fractional order chaotic systems using an active complex synchronization technique (ACST). Nonlinear type controllers are designed based on the master-slave composition and Lyapunov's stability criterion (LSC). HCPS is an extended version of the previously designed projective synchronization scheme. In the HCPS scheme, a complex scale matrix is used to asymptotically synchronize the system taken as the slave system with another system taken as the master system. The use of a complex scale matrix increases the unpredictability and security of communication along with image encryption. An efficient computational method is employed to validate and visualize the efficacy of the HCPS method through numerical simulation outcomes in MATLAB (version 2021).
Article
Automation & Control Systems
Quanshun Luo
Summary: This paper proposes a new approach to simultaneously measure residual normal and shear stresses. The new method shows significantly increased precision compared to the conventional method.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Review
Mechanics
O. Maklad, R. J. Poole
Summary: Shear flow is a common type of deformation that significantly affects the rheological properties of complex fluids. While the rheological properties of complex fluids can be fully characterized by three material functions, the characterization often focuses only on shear viscosity and may overlook the importance of the second normal-stress difference N-2 in various flows.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2021)
Article
Thermodynamics
Sivani Baskaran, Ying Duan Lei, Frank Wania
Summary: Bioaccumulation modeling has identified a lower limit for the log KOA values of chemicals that potentially bioaccumulate in air-breathing organisms. We adjusted the generator column method to determine KOA values of volatile compounds and successfully obtained reliable data. These findings have implications in assessing the bioaccumulation potential of different chemicals.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2023)
Article
Mechanics
Harishankar Manikantan, Todd M. Squires
JOURNAL OF FLUID MECHANICS
(2020)
Article
Chemistry, Physical
J. M. Barakat, T. M. Squires
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Physics, Fluids & Plasmas
Anirudha Banerjee, Huanshu Tan, Todd M. Squires
PHYSICAL REVIEW FLUIDS
(2020)
Article
Chemistry, Physical
Alexandra Bayles, Julia M. Fisher, Connor S. Valentine, Arash Nowbahar, Matthew E. Helgeson, Todd M. Squires
Summary: Polymeric ionogels are helpful for the release and storage of molecular solutes in various applications. A study showed that water diffuses through these ionogels by hopping between relatively immobile cations, and the activation energy barrier can be determined from H-1 NMR chemical shift measurements to predict water's diffusivity quantitatively. This predictive model could accelerate IL-material screening and suggest targets for rational design based on the strong connection between solute mobility and hydrogen bonding.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Multidisciplinary Sciences
Huanshu Tan, Anirudha Banerjee, Nan Shi, Xiaoyu Tang, Amr Abdel-Fattah, Todd M. Squires
Summary: The study proposes a two-step strategy to deliver suspended colloids to hidden targets in closed porous media by converting hidden targets into soluto-inertial beacons and introducing deliverable objects designed to autonomously migrate against solute fluxes emitted by the targets. Experimental and theoretical demonstrations show the design elements required for delivering colloidal objects to hidden targets in various environments and technologies.
Article
Chemistry, Multidisciplinary
Joseph M. Barakat, Todd M. Squires
Summary: This study investigates the behavior of elastic inclusions embedded in curved fluid interfaces. The results show that the behavior of the inclusions depends on their size and stiffness. Small, stiff inclusions are limited by bending, while larger and softer inclusions are limited by stretching.
Article
Multidisciplinary Sciences
Varun H. Hegde, Michael F. Doherty, Todd M. Squires
Summary: The article introduces two models to describe solvent transport through swollen nonporous membranes, and demonstrates through a fluid-solid model that both models are valid and make identical predictions. The model research provides explanations for reverse osmosis measurements and a basis for high-pressure limiting flux phenomena, while also offering a framework for treating mechanically heterogeneous nonporous membrane materials.
Article
Physics, Fluids & Plasmas
Joseph M. Barakat, Todd M. Squires
Summary: The importance of understanding the mechanics of curved, heterogeneous, surfactant-laden surfaces and interfaces in engineering and biological applications is highlighted in this paper. Previous models have mainly focused on homogeneous systems with planar or fixed curvature. The authors investigate a dynamic model involving a two-phase surface fluid on a curved interface, with the aim of understanding how changes in surface curvature affect the flow inside the domain. The results show that the surface curvature relaxes diffusively and that there is a critical surface capillary number above which shape instability occurs.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Chemistry, Multidisciplinary
Junchi Ma, Olivia M. Haider, Chih-Cheng Chang, Kathryn A. Grzesiak, Todd M. Squires, Lynn M. Walker
Summary: The formation of highly stable water-in-oil emulsions poses challenges in upstream and downstream processing. The adsorption of surface-active asphaltenes at the oil/water interface is found to result in the formation of rigid films. The interfacial properties differ under good and poor solvent conditions. This study provides insights into the impact of the aggregation state of asphaltenes on the stability and mechanics at the oil/water interface.
Article
Multidisciplinary Sciences
Omar A. Saleh, Sam Wilken, Todd M. Squires, Tim Liedl
Summary: This study investigates the dynamics of dilute internal inclusions, called vacuoles, within liquid droplets of DNA nanostar particles. The researchers observe appearance, growth, and bursting of the vacuoles, and find that their growth follows a linear relationship with time. The vacuoles burst when they reach the droplet interface, causing droplet motion due to osmotic pressure. A diffusion-based model is developed to explain these behaviors quantitatively.
NATURE COMMUNICATIONS
(2023)
Article
Biochemical Research Methods
Parth R. Shah, Huanshu Tan, David Taylor, Xiaoyu Tang, Nan Shi, Afnan Mashat, Amr Abdel-Fattah, Todd M. Squires
Summary: The temperature dependence of diffusiophoretic mobility (D-DP) has been investigated experimentally and compared with theoretical predictions. A new microfluidic approach has been developed to enable steady state gradients and precise measurements of diffusiophoretic migration. The measured results show that D-DP values increase with temperature and agree with theoretical predictions based on electrophoretically-measured zeta potentials. These findings demonstrate the accuracy of existing diffusiophoresis theories and the potential of the new microfluidic approach.
Article
Chemistry, Physical
Joseph M. Barakat, Todd M. Squires
Summary: This research explores the interaction of inert colloids in curved interfaces, demonstrating that a curvature gradient can induce capillary force on inert colloids. Through 2D Laplace problems, the study explains the factors to consider when calculating particle forces in detail. By clarifying some nuances in capillary statics and electrostatics, the research extends previous findings in the field.
Article
Engineering, Chemical
Patrick T. Spicer, Marco Caggioni, Todd M. Squires
CHEMICAL ENGINEERING PROGRESS
(2020)
Article
Chemistry, Physical
Ian Williams, Joseph A. Zasadzinski, Todd M. Squires
Article
Physics, Fluids & Plasmas
Anirudha Banerjee, Douglas R. Vogus, Todd M. Squires