4.6 Article

Magnetic Control of Water Droplet Impact onto Ferrofluid Lubricated Surfaces

Related references

Note: Only part of the references are listed.
Article Chemistry, Physical

Impact dynamics of ferrofluid droplet on a PDMS substrate under the influence of magnetic field

Sudip Shyam et al.

Summary: We investigated the impact dynamics of a ferrofluid droplet on a PDMS substrate in the presence of a non-uniform magnetic field. Through high-speed imaging, we uncovered the different characteristic behaviors of the droplet under the influence of a vertically applied magnetic field. The combined effects of magnetic, viscous, inertial, and interfacial energies determine the equilibrium shape of the droplet, which can be classified into three types: no spike, single spike, and multiple spike assemblies. We also observed the chain-like clustering of magnetic nanoparticles inside the ferrofluid flow domain, which contributes to the formation of spike assemblies and increases the viscous force of the droplet in the presence of a magnetic field. The findings of this study could have implications for the design of applications requiring controlled droplet spreading, such as ink-jet printing or 3D printing.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2023)

Article Chemistry, Physical

Vertical magnetic field aided droplet-impact- magnetohydrodynamics of ferrofluids

Nilamani Sahoo et al.

Summary: This article investigates the magnetohydrodynamics of ferrofluid droplets impacting on different wettability surfaces in the presence of vertical magnetic field and discusses the effects of magnetic field on droplet dynamics. The study reveals that magnetic field can delay droplet pinch-off, suppress rebound, and a theoretical formulation based on energy conservation principle is proposed. The research shows that in high Bom conditions, the capillary waves and motion of the contact line of droplets are inhibited.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2022)

Article Physics, Multidisciplinary

Reversible transition from ferrofluid drop to spikes due to an approaching magnet

S. K. Jain et al.

Summary: In this experiment, we observed a reversible transition from a ferrofluid droplet to spike structures, driven by normal field instability. The critical magnetization and characteristic wavelength of the ferrofluid were found to control this reversible transition. We also extended the theory of magnetic instability to include non-uniformity in the magnetic field in all directions, and the predicted critical condition for transition was in good agreement with the experimental results.
Article Chemistry, Multidisciplinary

Maximum Spreading of Impacting Ferrofluid Droplets under the Effect of Nonuniform Magnetic Field

Qian-Ping Li et al.

Summary: This study investigates the maximum spreading of ferrofluid droplets on a hydrophobic surface under nonuniform magnetic fields, emphasizing the effects of magnetic field strength. A dimensionless parameter is introduced to rescale experimental data, making it applicable to a wide range of impact velocities and magnetic field strengths.

LANGMUIR (2022)

Article Chemistry, Multidisciplinary

Magnetic Field-Assisted Fission of a Ferrofluid Droplet for Large-Scale Droplet Generation

Haibo Zhao et al.

Summary: In this study, the behavior of a ferrofluid droplet impacting on a liquid-repellent surface under the influence of an external magnetic field is systematically investigated. The maximum spreading diameter and fission phenomenon of the droplet are predicted based on a scaling relation involving the Weber and magnetic Bond numbers. Two types of fission are identified and a semiempirical formula is proposed to estimate the number of daughter droplets.

LANGMUIR (2022)

Article Chemistry, Multidisciplinary

Electrically Induced Liquid Metal Droplet Bouncing

Shubhi Bansal et al.

Summary: This study explores the three-dimensional bouncing phenomenon of liquid metal droplets and compares the bouncing trajectories under different driving parameters. The results show that the jumping height of the droplets increases with the decrease in voltage frequency and the increase in amplitude, offering new opportunities for applications such as energy harvesting, heat transfer, and radio frequency switching utilizing liquid metal droplet operations.

LANGMUIR (2022)

Review Chemistry, Multidisciplinary

Droplet Bouncing: Fundamentals, Regulations, and Applications

Xing Han et al.

Summary: Droplet impact is a common phenomenon in nature, daily life, and industrial processes, and it is crucial to control the outcomes for different applications. Droplet bouncing, as a special outcome, preserves the droplet shape and minimizes energy loss, making it beneficial in various applications. This review provides a comprehensive understanding of millimeter-sized droplet bouncing on solid surfaces and liquid pools, summarizing regulation methods, current applications, and proposing potential directions for future research.

SMALL (2022)

Article Chemistry, Multidisciplinary

Liquid-Liquid Encapsulation of Ferrofluid Using Magnetic Field

Utsab Banerjee et al.

Summary: Encapsulated magnetic microdroplets have great significance in drug targeting and therapeutic applications. This study presents a simple magnet-assisted framework to wrap ferrofluid droplets inside PDMS. Based on experimental observations, three regimes of encapsulation are identified, depending on the magnetic Bond number and the thickness of the PDMS layer. Furthermore, the versatility of the technique is demonstrated by stable wrapping of multiple droplets and successful underwater manipulation.

ADVANCED MATERIALS INTERFACES (2022)

Article Chemistry, Multidisciplinary

Coalescence-Induced Droplet Jumping on Honeycomb Bionic Superhydrophobic Surfaces

Yan Gao et al.

Summary: By developing a class of honeycomb bionic superhydrophobic surfaces (HBSS), reliable and efficient droplet jumping on a large scale was achieved for the first time, ensuring the uniformity of droplet diameter. The shape and geometric parameters of the surface significantly impact the efficiency of droplet jumping, with the experimentally measured maximum dimensionless jumping velocity reaching 0.747, corresponding to an efficiency of about 45.25%.

LANGMUIR (2022)

Article Chemistry, Multidisciplinary

Drop Impact on a Superhydrophilic Spot Surrounded by a Superhydrophobic Surface

Niladri Sekhar Satpathi et al.

Summary: The study investigates the behavior of a liquid drop impacting a composite surface with superhydrophilic and superhydrophobic regions, finding different regimes based on spot size and Weber number. Increasing the spot size can avoid splashing and jetting regimes, leading to a stable regime even at higher Weber numbers. The developed analytical model accurately predicts the maximum spreading diameter on the composite surface, highlighting the importance of the parameter K in the model for predicting experimentally measured outcomes.

LANGMUIR (2021)

Article Mechanics

Magnetofluidic mixing of a ferrofluid droplet under the influence of a time-dependent external field

Sudip Shyam et al.

Summary: Experimental investigations were conducted on the mixing of a ferrofluid droplet with a non-magnetic miscible fluid in the presence of a time-dependent magnetic field on an open surface microfluidic platform. It was found that the movement of magnetic nanoparticles inside the ferrofluid droplet domain strengthens flow instability and promotes mixing efficiency.

JOURNAL OF FLUID MECHANICS (2021)

Article Nanoscience & Nanotechnology

Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces

Mehdi H. Biroun et al.

Summary: This study introduces a new method to actively control the droplet impact onto superhydrophobic and SLIPS surfaces using surface acoustic waves (SAWs). The results show that SAWs can effectively modify the impact dynamics of droplets on the surfaces by altering the oil lubricant thickness, reducing contact time, and changing rebound angles.

ACS APPLIED MATERIALS & INTERFACES (2021)

Article Physics, Applied

Impingement-assisted self-assembly of ferrofluid droplets under magnetic field

Zhaoyi Wang et al.

Summary: The unique liquid nature and strong magnetic response of ferrofluid droplets enable them to split and self-assemble into reconfigurable three-dimensional structures. This study explores the impingement-assisted self-assembly of ferrofluids on superhydrophobic surfaces, reducing the required magnetic field and allowing for precise regulation of post-impact dynamics. The findings suggest potential applications in multifunctional analytical and fluidic devices.

APPLIED PHYSICS LETTERS (2021)

Article Chemistry, Multidisciplinary

Drop Bouncing Dynamics on Ultrathin Films

Ziwen He et al.

Summary: Experimental results and observations reveal the dynamics of drops contacting thin films and the factors that influence the process. Within specific thickness and drop size ratio ranges, the possibility of drop contact bouncing is established.

LANGMUIR (2021)

Article Chemistry, Multidisciplinary

Magneto-Elastic Effect in Non-Newtonian Ferrofluid Droplets Impacting Superhydrophobic Surfaces

Gudlavalleti V. V. S. Vara Prasad et al.

Summary: This study demonstrates the existence of magneto-elastic effects in the impact hydrodynamics of non-Newtonian ferrofluid droplets on superhydrophobic surfaces in the presence of a magnetic field. The addition of polymers causes rebound suppression of the droplets, while increasing magnetic nanoparticle concentration triggers earlier rebound suppression. Non-Newtonian droplets without magnetic nanoparticles do not show rebound suppression, highlighting the interplay of elastic effects of polymer chains and magnetic nanoparticles.

LANGMUIR (2021)

Article Chemistry, Multidisciplinary

Cloaked Droplets on Lubricant-Infused Surfaces: Union of Constant Mean Curvature Interfaces Dictated by Thin-Film Tension

Madhu Ranjan Gunjan et al.

Summary: A mean curvature-based framework is presented for modeling cloaked droplets on lubricant-infused surfaces, considering the cloaking film tension and disjoining pressure. The shape of small droplets on LIS obeys a fundamental mean curvature relation that changes depending on lubrication regimes and cloak status. The study validates the framework with experimental data on droplet profiles, as well as demonstrates the modeling of floating droplets on LISs and the quantification of the effect of disjoining pressure on interfacial profiles.

LANGMUIR (2021)

Article Mechanics

Drop impact onto polarized dielectric surface for controlled coating

A. Sankaran et al.

Summary: This study experimentally investigates the electrohydrodynamics of drop impact onto a dielectric surface with embedded electrodes, demonstrating that the application of electric field can significantly enhance drop spreading on non-wettable surfaces, suppress water drop rebound, and partially suppress splash phenomena. Comparisons with simulations show close agreement for water drops, suggesting that electrowetting-on-dielectric holds great promise for coating and spraying technologies.

PHYSICS OF FLUIDS (2021)

Article Thermodynamics

Dynamic behaviors of droplets impacting on ultrasonically vibrating surfaces

Haixiang Zhang et al.

EXPERIMENTAL THERMAL AND FLUID SCIENCE (2020)

Article Chemistry, Multidisciplinary

Trapping and Coalescence of Diamagnetic Aqueous Droplets Using Negative Magnetophoresis

S. K. Jain et al.

LANGMUIR (2020)

Article Physics, Applied

Acoustic Waves for Active Reduction of Contact Time in Droplet Impact

Mehdi H. Biroun et al.

PHYSICAL REVIEW APPLIED (2020)

Article Chemistry, Multidisciplinary

Dynamic Behavior of Droplet Impact on Inclined Surfaces with Acoustic Waves

Mehdi H. Biroun et al.

LANGMUIR (2020)

Article Mechanics

Bouncing drop on liquid film: Dynamics of interfacial gas layer

Xiaoyu Tang et al.

PHYSICS OF FLUIDS (2019)

Article Chemistry, Multidisciplinary

Bouncing-to-Merging Transition in Drop Impact on Liquid Film: Role of Liquid Viscosity

Xiaoyu Tang et al.

LANGMUIR (2018)

Article Chemistry, Physical

Effects of magnetic field on the spreading dynamics of an impinging ferrofluid droplet

Abrar Ahmed et al.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2018)

Article Thermodynamics

Impact dynamics and deposition of pristine and graphene-doped PEDOT:PSS polymeric droplets on stationary and vibrating substrates

Firuze Soltani-Kordshuli et al.

EXPERIMENTAL THERMAL AND FLUID SCIENCE (2017)

Article Chemistry, Multidisciplinary

Impact of Droplets on Liquid Films in the Presence of Surfactant

Zhizhao Che et al.

LANGMUIR (2017)

Article Mechanics

High-speed oblique drop impact on thin liquid films

Yisen Guo et al.

PHYSICS OF FLUIDS (2017)

Article Mechanics

Morphology of drop impact on a superhydrophobic surface with macro-structures

Kartik Regulagadda et al.

PHYSICS OF FLUIDS (2017)

Article Physics, Fluids & Plasmas

Droplet impact on vibrating superhydrophobic surfaces

Patricia B. Weisensee et al.

PHYSICAL REVIEW FLUIDS (2017)

Article Mechanics

Droplet impact on a thin liquid film: anatomy of the splash

Christophe Josserand et al.

JOURNAL OF FLUID MECHANICS (2016)

Article Mechanics

On the spreading of impacting drops under the influence of a vertical magnetic field

Jie Zhang et al.

JOURNAL OF FLUID MECHANICS (2016)

Article Multidisciplinary Sciences

Superhydrophobic-like tunable droplet bouncing on slippery liquid interfaces

Chonglei Hao et al.

NATURE COMMUNICATIONS (2015)

Article Thermodynamics

Simulation of droplet impact on liquid film with CLSVOF

Yali Guo et al.

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER (2014)

Article Chemistry, Analytical

Circulating Tumor Cell Microseparator Based on Lateral Magnetophoresis and Immunomagnetic Nanobeads

Seonyoung Kim et al.

ANALYTICAL CHEMISTRY (2013)

Review Nanoscience & Nanotechnology

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

Nam-Trung Nguyen

MICROFLUIDICS AND NANOFLUIDICS (2012)

Article Engineering, Mechanical

Normal droplet impact on horizontal moving films: an investigation of impact behaviour and regimes

Samah K. Alghoul et al.

EXPERIMENTS IN FLUIDS (2011)

Article Mechanics

Insights on the impact of a plane drop on a thin liquid film

Gennaro Coppola et al.

PHYSICS OF FLUIDS (2011)

Article Chemistry, Physical

Dynamics of the cavity and the surface film for impingements of single drops on liquid films of various thicknesses

Nils Paul van Hinsberg et al.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2010)

Article Multidisciplinary Sciences

Label-free cellular manipulation and sorting via biocompatible ferrofluids

Ayse R. Kose et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2009)

Article Mechanics

High-Speed Imaging of Drops and Bubbles

S.T. Thoroddsen et al.

Annual Review of Fluid Mechanics (2008)

Article Mechanics

An experimental study on Rosensweig instability of a ferrofluid droplet

Ching-Yao Chen et al.

PHYSICS OF FLUIDS (2008)

Article Physics, Condensed Matter

Investigation of the microscopic reason for the magnetoviscous effect in ferrofluids studied by small angle neutron scattering

Loredana Mirela Pop et al.

JOURNAL OF PHYSICS-CONDENSED MATTER (2006)

Article Mechanics

Droplet impact on a thin fluid layer

SD Howison et al.

JOURNAL OF FLUID MECHANICS (2005)

Review Physics, Condensed Matter

Recent progress in magnetic fluid research

S Odenbach

JOURNAL OF PHYSICS-CONDENSED MATTER (2004)

Article Physics, Applied

Continuous microfluidic immunomagnetic cell separation

DW Inglis et al.

APPLIED PHYSICS LETTERS (2004)

Article Mechanics

Droplet splashing on a thin liquid film

C Josserand et al.

PHYSICS OF FLUIDS (2003)

Article Mechanics

Splashing impact of a single drop onto very thin liquid films

AB Wang et al.

PHYSICS OF FLUIDS (2000)