Article
Chemistry, Multidisciplinary
Guangyu Ou, Jun Li, Yang Jin, Ming Chen, Yujing Ma, Kaige Gao
Summary: This paper investigates the behavior evolution of two single droplets suspended in castor oil under an alternating current electric field using a high-speed camera. Six distinct behavior evolution modes are observed and summarized, including coalescence, bounce, partial coalescence, partial rupture, coalescence-rupture, and rupture. The behavior mode is influenced by the initial separation distance and the electric field strength. The mechanisms of behavior evolution are revealed by investigating the confrontation between electric force and capillary force and the pressure difference from the surrounding fluid and electric force. Additionally, a cone-dimple mode of water droplets in castor oil is found.
Article
Energy & Fuels
Yi Shi, Jiaqing Chen, Hao Meng
Summary: This study investigates the demulsification performance of W/O emulsion in an electric field-enhanced separator with insulated electrode assembly. Real-time measurements of water droplet sizes are done using Focused Beam Reflectance Measurement (FBRM). The results show that a high frequency AC electric field can promote the growth of small water droplets and improve demulsification. However, increasing inlet water content or flowrate deteriorates the dehydration performance.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Harry Collini, Matthew D. Jackson
Summary: Despite the wide range of interest and applications, the controls on surface charge of crude oil in aqueous solution are not well understood. This study collates and reviews previous measurements of zeta potential on crude oil, compares and contrasts the results, and reports new measurements of zeta potential on crude oil wetting films and layers. The results show that the zeta potential depends on electrolyte pH and the concentration of divalent ions Ca2+ and Mg2+. Lower pH and higher concentration of these divalent ions lead to more positive zeta potential. The findings have important implications for engineering and industrial activities involving crude oil.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Chemical
Zhenbo Wang, Ning Li, Zhiqian Sun, Xiaolei Wang, Qi Chen, Wenchuan Liu, Zhuang Qi, Luchen Wei, Bin Li
Summary: This study used molecular dynamics simulations to investigate the electrocoalescence behavior of water droplets in a water-in-oil emulsion under a uniform electric field. The results showed that the coalescence process of water droplets can be divided into three stages based on solvent accessible surface area, and that electrostatic attraction between water molecules played a dominant role in the coalescence. The study also indicated that oil-phase molecules can be used as a substitute for nitrogen in studying droplet coalescence behaviors.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Mechanics
Joy Mandal, Deep Chatterjee, Sandip Sarkar
Summary: We numerically investigated the effect of electrohydrodynamics on a non-Newtonian droplet pair suspended in a Newtonian medium. The leaky dielectric model was used to study the response of emulsion drops in an externally applied electric field. The study found that the droplet deformation and net motion varied depending on the electrical permittivity ratios and different fluid behaviors of the drops. The results provide insights into the behavior of nonlinear fluids under an electric field.
Article
Chemistry, Physical
Wangqing Li, Zhiqian Sun, Ning Li, Zhuang Qi, Shuo Weng, Shuhe Peng, Tianhao Liu, Zhenbo Wang
Summary: In this study, the movement and coalescence mechanism of non-centric droplets in hexane under the influence of an electric field were investigated using molecular dynamics simulation. The results revealed three different droplet behaviors based on the Weber number. The analysis of interaction energy and hydrogen bond revealed that the coalescence of droplets is promoted by increasing the Weber number. However, there is a threshold Weber number beyond which droplet coalescence does not occur. This study provides fundamental insights into the mechanism of droplet coalescence under the coupling effect of electric and flow fields.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
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
Biophysics
Sneha Daradmare, Chang -Soo Lee
Summary: An aqueous two-phase system (ATPS) is a liquid-liquid phase separation system that shows great potential for various applications in the extraction and separation of biomolecules. Water-in-water emulsions have promising applications in the biomedical field. However, the low interfacial tension between the two phases makes it challenging to generate water-in-water emulsion droplets. Microfluidic platforms offer a solution by providing monodisperse emulsion droplets with a spherical shape, small volumes, and short reaction times.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Review
Chemistry, Multidisciplinary
Sebastien Sart, Gustave Ronteix, Shreyansh Jain, Gabriel Amselem, Charles N. Baroud
Summary: The manipulation of cells in droplets using microfluidic technologies has shown great success, particularly in single-cell screening. It has also been used to study interactions between different cells and their environment. The quantitative aspects, biological constraints, and measurement methods of this technology have been reviewed, with a focus on applications in cancer studies, immunology, and stem cells, emphasizing the biological relevance of the cellular assays and providing guidelines for improvement.
Article
Mechanics
Callum Cuttle, Alice B. Thompson, Draga Pihler-Puzovic, Anne Juel
Summary: Experiments showed that the process of droplet engulfment involves rapid submersion driven by capillary forces on the oil surface, followed by a slower peeling of the droplet from the interface. Both geometric constraints and gravity play essential roles in the completion of droplet engulfment. The longest engulfment times are observed for droplets of intermediate size due to the opposing effects of geometry and gravity.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Environmental Sciences
Francis Letendre, Paloma Arena Serrano Ramos, Christopher B. Cameron
Summary: This study examines the effects of a surfactant on the size distribution of oil droplets in water and in the gut of Daphnia magna. It also investigates the impact of surfactants on the detachment conditions of chemically and mechanically dispersed oil droplets. The results show that the addition of solubilized dioctyl sulfosuccinate sodium salt produces smaller and more evenly distributed droplets in the water. Furthermore, surfactant-coated droplets detach at a slower velocity than mechanically dispersed droplets due to lower oil/water interfacial tension.
MARINE POLLUTION BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Juan Sebastian Marin Quintero, Butunath Majhy, Markus Caesar, Prashant R. Waghmare
Summary: Manipulating the coalescence of microdroplets using electrowetting has gained significant attention recently. The study investigates the electrocoalescence dynamics by considering various operating parameters. A revised characteristic time scale is introduced to account for driving and resisting forces, enabling a universal bridge growth between the merging droplets. Additionally, a geometric analysis is conducted to determine the initial separation distance for precise control of droplet coalescence.
Review
Engineering, Environmental
Ebuka Chizitere Emenike, Joy Adeleke, Kingsley O. Iwuozor, Samuel Ogunniyi, Comfort A. Adeyanju, Victor Temitope Amusa, Hussein Kehinde Okoro, Adewale George Adeniyi
Summary: Crude oil plays a significant role in a country's economy, but it negatively affects global water resources. This study reviews recent advancements in crude oil sorption techniques, particularly through adsorption, and categorizes adsorbents into different classes. Biosorbents are found to be the most commonly used and most effective adsorbent class. Other adsorption processes and factors are also discussed, along with recommendations for future studies.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Physical
Yu Han, Joel Koplik, Charles Maldarelli
Summary: The study found that high elasticity of droplets at high surface concentrations resists deformation, while dilatational viscosity scales with the ratio kappa* and can extend deformation time.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Environmental Sciences
Vincent Hickl, Gabriel Juarez
Summary: This study investigated the effects of dispersants on the attachment and growth of marine bacteria on different sizes of crude oil droplets using microfluidics and time-lapse microscopy. The results showed that dispersants do not affect these biophysical processes.
MARINE POLLUTION BULLETIN
(2022)
Article
Chemistry, Physical
Thomas F. Leary, Arun Ramachandran
Article
Nanoscience & Nanotechnology
Ankit D. Kanthe, Mary Krause, Songyan Zheng, Andrew Ilott, Jinjiang Li, Wei Bu, Mrinal K. Bera, Binhua Lin, Charles Maldarelli, Raymond S. Tu
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Engineering, Electrical & Electronic
Alexander M. Watson, Thomas F. Leary, Kareem S. Elassy, Aji G. Mattamana, M. Arifur Rahman, Wayne A. Shiroma, Aaron T. Ohta, Christopher E. Tabor
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2019)
Article
Physics, Fluids & Plasmas
M. Houssais, Charles Maldarelli, Jeffrey F. Morris
Summary: The dynamics of sediment creep under the stress of porous flow remains a relatively unexplored field. Experimental results show that the deformation rate of sediment increases with the control parameters, and a new dimensionless parameter P* allows for a collapse of all deformation results onto a single curve. Two distinct creep regimes are identified, corresponding to a systematic change in mean void size as P* increases.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Mechanics
Subhabrata Das, Joel Koplik, Ponisseril Somasundaran, Charles Maldarelli
Summary: This study examines the hydrodynamic interaction between identical spherical colloids on a planar gas/liquid interface, calculating drag coefficients based on separation distance and immersion depth. The results show that normalized coefficients increase with a decrease in separation, but remain bounded at contact, while coefficients for in-tandem motion decrease with decreasing separation, eventually collapsing to match the drag coefficient for two particles moving in tandem in an infinite medium.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Multidisciplinary Sciences
Ankit Kanthe, Andrew Ilott, Mary Krause, Songyan Zheng, Jinjiang Li, Wei Bu, Mrinal K. Bera, Binhua Lin, Charles Maldarelli, Raymond S. Tu
Summary: The interaction of monoclonal antibodies with air/water interfaces is crucial for their stability in solution, which can be studied using pendant bubble measurements and x-ray reflectivity to obtain electron density profiles at the surface. By comparing simulations and experimental data, it is shown that mAbs transition from flat-on Y-shape configurations to side-on or end-on configurations at the interface, with the presence of β sheets. This understanding can lead to new strategies for the manufacture and storage of antibody-based therapeutics.
Article
Multidisciplinary Sciences
Mohsen S. Yeganeh, Arben Jusufi, Shane P. Deighton, Matthew S. Ide, Michael Siskin, Aditya Jaishankar, Charles Maldarelli, Pedro Bertolini, Bharath Natarajan, Jessica L. Vreeland, Mark A. King, Andrew R. Konicek
Summary: Economical CO2 capture can be achieved with the liquid-infused surface (LIS) approach, which immobilizes reactive liquids on a textured solid substrate to overcome mass transport resistance. This new method, called SWIRL, does not require dilution or costly mixing, and exhibits stable and high capture capacities.
Proceedings Paper
Engineering, Electrical & Electronic
Alexander M. Watson, Thomas F. Leary, Jonathan Itokazu, Aji G. Mattamana, Tony Quach, Aaron T. Ohta, Wayne A. Shiroma, Christopher E. Tabor
Summary: Room-temperature liquid metals like EGaIn alloys have potential for physically reconfigurable microwave components. By integrating microfluidic control of liquid conductors with standard microwave circuits, a new paradigm of tunability is achieved. Using a microfluidic-integrated microwave inductor device, precise volumes of liquid metal can be dispensed and confined to reconfigure the total length of the narrow trace, providing an effective method to tune the component's inductance.
2021 IEEE TEXAS SYMPOSIUM ON WIRELESS AND MICROWAVE CIRCUITS AND SYSTEMS (WMCS)
(2021)
Article
Chemistry, Analytical
Christiana Oh, Bumjun Park, Chunyan Li, Charles Maldarelli, Jennifer L. L. Schaefer, Timir Datta-Chaudhuri, Paul W. W. Bohn
Summary: The label-free electrochemical immunosensor developed in this work showed high sensitivity and selectivity for detecting IL-6 in human cerebrospinal fluid and serum. Its performance in quantifying IL-6 and distinguishing it from other common cytokines makes it a promising tool for rapid diagnostics and monitoring of cytokine-related illnesses.
ACS MEASUREMENT SCIENCE AU
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Alexander M. Watson, Kareem Elassy, Thomas Leary, M. Arifur Rahman, Aaron Ohta, Wayne Shiroma, Christopher E. Tabor
2019 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS)
(2019)
Article
Chemistry, Physical
Ghata M. Nirmal, Thomas F. Leary, Arun Ramachandran
Article
Biochemical Research Methods
Morgane Houssais, Charles Maldarelli, Jeffrey F. Morris
Article
Biochemical Research Methods
Xiaoxiao Chen, Thomas F. Leary, Charles Maldarelli