Article
Mechanics
Gesse Roure, Alexander Z. Zinchenko, Robert H. Davis
Summary: In this paper, a boundary-integral method is developed to simulate the motion of drops in microchannels with arbitrary geometries. The results show that scaling with maximum vs average velocities can accelerate the convergence of the simulation. Non-regular geometries can affect drop partitioning and introduce challenges when comparing results for different depths. Inertial effects on undisturbed flow are small for moderate Reynolds numbers.
Article
Chemistry, Physical
Chaolumen Wu, Zhenda Lu, Zhiwei Li, Yadong Yin
Summary: Template-mediated self-assembly of colloidal nanoparticles into secondary structures is an important method for exploring new materials with unique collective properties. A general method to prepare submicron hollow superstructures by self-assembling hydrophobic colloidal nanoparticles together with polymeric additives within oil-in-water emulsion droplets is reported. The resulting hollow superstructures of nanoparticles show potential for diverse applications.
Article
Acoustics
Idowu Adeyemi, Mahmoud Meribout, Lyes Khezzar, Nabil Kharoua, Khalid AlHammadi
Summary: This study conducted a numerical assessment of binary water droplet coalescence in water-in-oil emulsion and investigated the effects of various parameters on the acoustic pressure and coalescence time. The results showed that the implementation of ultrasound enhanced the coalescence of water droplets, while lower interfacial tension and higher dynamic viscosity reduced the coalescence time.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Mechanics
Saroj Ray, Yicheng Chi, Peng Zhang, Song Cheng
Summary: The impacts of liquid droplets with stationary droplets on a surface have significant importance in various applications. In this study, we experimentally and theoretically investigated head-on collisions of unequal-size droplets of the same liquid on wetting surfaces, analyzing collision outcomes and characterizing the bouncing process. An analytical model based on energy balance was developed to calculate key parameters, showing good agreement with experimental data. The results indicate that the maximum spread diameter of falling droplets weakly depends on the impact Weber number and is smaller for higher size ratios.
Article
Chemistry, Physical
Kai Guo, Xiaoya Liu, Ling Du, Yuling Lu, Xiaoming Luo, Xiao Ling
Summary: Electromagnetic synergy is a more effective method than single AC electric field (ACEF) for enhancing oil-water separation. However, the electrocoalescence behavior of droplets dispersed with salt ions in oil under synergistic electromagnetic field (EMSF) is not yet well-researched. This study compared the evolution coefficient of liquid bridge diameter (C(1)) in Na2CO3-dispersed droplets under ACEF and EMSF and found that C(1) under ACEF was larger. The study also proposed the theory of ion enrichment to explain the influence of salt ions on zeta potential and total surface potential in EMSF. This research provides guidance for designing high-performance devices for water-in-oil emulsion treatment by introducing electromagnetic synergy.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Engineering, Chemical
Xu Zhu, Lei Zhu, Hui Li, Chunyu Zhang, Jinwei Xue, Ran Wang, Xurong Qiao, Qingzhong Xue
Summary: The PVA hydrogel nanofibrous membrane achieves sustained separation capability in oil-water emulsion separation through the SCD method, indicating great potential for practical applications.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Physics, Multidisciplinary
Noah Ziethen, Jan Kirschbaum, David Zwicker
Summary: Driven chemical reactions can control the macroscopic properties of droplets, like their size, which is critical for structuring the interior of biological cells. Numerical simulations and an equilibrium surrogate model show that reactions suppress droplet nucleation by increasing the energy barrier. The model also allows the construction of a phase diagram, providing accurate predictions of how driven reactions delay nucleation, which is relevant for understanding droplets in biological cells and chemical engineering.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Manojkumar Lokanathan, Sarith Wimalarathne, Vaibhav Bahadur
Summary: This study investigates the influence of surfactant on the electrowetting-induced surface electrocoalescence of micron-scale water droplets. The research shows that with the presence of surfactant, electrocoalescence weakens, but there is still a substantial increase in droplet radius. The study also characterizes the droplet generation process and identifies the parameter space for surface-electrocoalescence-based fluidic separation and droplet generation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Review
Chemistry, Physical
Thao Minh Ho, Aysan Razzaghi, Arun Ramachandran, Kirsi S. Mikkonen
Summary: Emulsions play a significant role in various industries and the understanding of factors affecting their generation, such as properties of dispersed and continuous phases, system conditions, and emulsifier behavior, is crucial for their design and optimization of processing conditions.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Mechanics
Nang X. Ho, Truong V. Vu
Summary: The present study numerically investigates the dynamics of on-axis collisions of compound droplets using an axisymmetric front-tracking method. The effects of various parameters (such as Reynolds number, Weber number, size of inner droplets, interfacial tension ratio, and eccentricity) on the collision outcomes are examined. Three primary outcomes, namely complete coalescence, outer coalescence, and rebound, are observed. The regime diagrams related to these collision patterns are also presented.
Article
Engineering, Chemical
Yhan O'Neil Williams, Mara Wensveen, Meinou Corstens, Karin Schroe
Summary: This study quantitatively investigates the coalescence mechanisms of protein-stabilized high internal phase emulsions (HIPEs) using a purposely designed microfluidic chip. The observations provide new insights into the evolution of droplet interactions as a function of volume fraction and the destabilization mechanisms of protein-stabilized HIPEs.
JOURNAL OF FOOD ENGINEERING
(2024)
Article
Engineering, Chemical
Hannan Nadeem, R. Dennis Vigil, Amanda Samuel, Aaik Sarkar, Thean Yeoh, Michael G. Olsen
Summary: Phase separation behavior in an oil-in-water emulsion was investigated. The onset of phase separation was found to be dependent on shear strain rate and temperature, with earlier onset observed at higher shear strain rates or temperatures.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Chemistry, Physical
Lauren P. McCarthy, Peter Knapp, Jim S. Walker, Justice Archer, Rachael E. H. Miles, Marc E. J. Stettler, Jonathan P. Reid
Summary: This study experimentally investigates the dynamics of binary collisions of equi-diameter droplets with different impact speeds and angles, and compares the results with collision outcome prediction models. The experimental results show that different impact speeds and angles lead to different collision outcomes. This study provides reference for predicting collision outcomes of droplets.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Zhen Zhang, Yu-Hang Nie, Jun-Hui Zheng, Tao Yang
Summary: In this paper, we investigate the collisional dynamics of two-dimensional quantum droplets with a vortex. By adjusting various parameters, we identify three different mechanisms - splitting, no-splitting, and their crossover - based on the post-collision states, which are distinctly different from the collisional dynamics of vortex-free droplets. The initial phase difference between the droplets affects interference fringes and the splitting behavior. Furthermore, we demonstrate that three-body atom loss has no impact on the results.
Article
Optics
K. Mukherjee, S. M. Reimann
Summary: We investigate the classicality of linear dipolar droplet arrays through normal mode analysis and compare it with the supersolid regime. The vibrational patterns of isolated droplet crystals evolving over time after a small initial kick closely resemble those of a linear droplet chain. However, for larger kick velocities, droplets may coalesce and separate again, showing significant deviations from classicality. In the supersolid regime, the normal modes are eliminated by a counterflow of mass between the droplets, resulting in a reduction of the center-of-mass motion. Our study effectively captures the vibrational patterns of isolated droplets in the presence of three-body loss and can be extended to systems with a larger number of droplet arrays.
Article
Agricultural Engineering
Xi Gao, Bo Kong, R. Dennis Vigil
BIORESOURCE TECHNOLOGY
(2015)
Article
Engineering, Environmental
Xi Gao, Bo Kong, R. Dennis Vigil
CHEMICAL ENGINEERING JOURNAL
(2015)
Article
Engineering, Chemical
Xi Gao, Bo Kong, R. Dennis Vigil
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2016)
Article
Biotechnology & Applied Microbiology
Xi Gao, Bo Kong, R. Dennis Vigil
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2017)
Article
Biotechnology & Applied Microbiology
Paul Rudnicki, Xi Gao, Bo Kong, R. Dennis Vigil
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2017)
Article
Agricultural Engineering
Xi Gao, Bo Kong, R. Dennis Vigil
BIORESOURCE TECHNOLOGY
(2018)
Review
Biotechnology & Applied Microbiology
Xi Gao, Bo Kong, R. Dennis Vigil
BIOTECHNOLOGY LETTERS
(2018)
Article
Engineering, Mechanical
Charlton Campbell, Michael G. Olsen, R. Dennis Vigil
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2019)
Article
Engineering, Chemical
Mahdi Ramezani, Arya Haghighat, Meesha J. Legg, R. Dennis Vigil, Michael G. Olsen
Article
Nanoscience & Nanotechnology
Charlton Campbell, Michael G. Olsen, R. Dennis Vigil
Article
Mechanics
Charlton Campbell, Michael G. Olsen, R. Dennis Vigil
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2020)
Article
Mechanics
Krishnamurthy Ravichandar, R. Dennis Vigil, Rodney O. Fox, Stephanie Nachtigall, Andreas Daiss, Michal Vonka, Michael G. Olsen
Summary: Droplet dispersion in liquid-liquid systems is a crucial step in various industries. This study investigates droplet breakup using a novel method and finds that breakage time and breakage probability increase with increasing parent droplet size, while the shape of the child drop size distribution depends on the size of the parent droplet.
Article
Engineering, Environmental
Mandi Ramezani, Meesha J. Legg, Arya Haghighat, Zhiyi Li, R. Dennis Vigil, Michael G. Olsen
CHEMICAL ENGINEERING JOURNAL
(2017)
Article
Agricultural Engineering
Xi Gao, Bo Kong, R. Dennis Vigil
BIORESOURCE TECHNOLOGY
(2017)
Article
Pharmacology & Pharmacy
Greta Camilla Magnano, Marika Quadri, Elisabetta Palazzo, Roberta Lotti, Francesca Loschi, Stefano Dall'Acqua, Michela Abrami, Francesca Larese Filon, Alessandra Marconi, Dritan Hasa
Summary: This study aimed to investigate the loading of sildenafil citrate in three commercial transdermal vehicles using 3D full-thickness skin equivalent and compare the results with permeability experiments using porcine skin. The results showed that the results obtained using the 3D skin equivalent were comparable to those obtained using porcine skin, suggesting that the 3D skin model can be a valid alternative for ex-vivo skin absorption experiments.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2024)
Article
Pharmacology & Pharmacy
James W. Mckeage, Andrew Z. H. Tan, Andrew J. Taberner
Summary: Needle-free jet injection is a promising alternative drug delivery technique that offers rapid, non-invasive, and large-volume injections. The study presents a prototype multi-orifice nozzle and a computational fluid dynamic model to demonstrate the feasibility and effectiveness of this technology.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2024)