4.6 Article

Droplet Rolling Transport on Hydrophobic Surfaces Under Rotating Electric Fields: A Molecular Dynamics Study

Related references

Note: Only part of the references are listed.
Review Chemistry, Multidisciplinary

Active Synthetic Microrotors: Design Strategies and Applications

Xianglong Lyu et al.

Summary: Microrotors are microscopic objects that convert energy stored in the environment into spontaneous rotation. They have various applications, including drug delivery, minimally invasive surgery, fluid mixing, and sensing. They are also useful as model systems to study collective behaviors among rotating micro-objects.

ACS NANO (2023)

Article Chemistry, Physical

Transforming Droplets into Liquid Films in Nanochannels under Rotating Electric Fields Studied by Molecular Dynamics

Wenchuan Liu et al.

Summary: It is proposed to use a rotating electric field to stretch a droplet into a liquid film pinned to the channel inner wall as an active liquid valve. Molecular dynamics simulations prove that droplets in nanochannels can be stretched and expanded into closed liquid films under the action of rotating electric fields. The formation of the liquid film occurs through gradual expansion and liquid column rotation, with increased electric field strength and angular frequency favoring liquid film closing.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2023)

Article Multidisciplinary Sciences

Tailoring vapor film beneath a Leidenfrost drop

An Li et al.

Summary: The authors demonstrate how to manipulate drops by cutting the Leidenfrost film using chemically heterogeneous surfaces. They show that a segmented film cut by a Z-shaped pattern can spin a drop, with the superhydrophilic region directly contacting the drop and vaporizing the water, while a vapor film is formed on the superhydrophobic surrounding to reduce heat transfer. Furthermore, they reveal the general principle between the pattern symmetry design and the drop dynamics.

NATURE COMMUNICATIONS (2023)

Article Chemistry, Multidisciplinary

Wetting-State-Induced Turning of Water Droplet Moving Direction on the Surface

Shaoqian Hao et al.

Summary: The spontaneous directional movement of water droplets on a wedge-shaped groove has attracted attention, but the complete control of their movement direction and the underlying mechanism are still not fully understood. Molecular dynamics simulations and theoretical analyses reveal that the wetting state of the droplet on the surface determines its movement direction. Water droplets in the Wenzel and Cassie states move towards the diverging and converging ends of the wedge-shaped groove respectively, due to the opposite roles played by the substrate and upper layers. Additionally, the droplet is likely to move faster on a surface with a higher groove, larger opening angle, and stronger hydrophobicity. These findings contribute to a comprehensive understanding of droplet movement and provide insights for regulating the direction of droplet movement on groove surfaces.

ACS NANO (2023)

Article Mechanics

Directional self-motion of nanodroplets driven by controlled surface wetting gradients

Lijun Sun et al.

Summary: In this study, a method is proposed to control the self-propelling dynamics of droplets using a continuous wettability gradient via molecular dynamics simulation. The effects of single gradient, continuous gradient, and nonlinear complex wetting gradient on droplet motion are investigated. The results show that the droplet motion can be driven in a directional way by designing the wetting gradient surface.

PHYSICS OF FLUIDS (2023)

Article Multidisciplinary Sciences

Reconfigurable Vortex-like Paramagnetic Nanoparticle Swarm with Upstream Motility and High Body-length Ratio Velocity

Luyao Wang et al.

Summary: Drug delivery systems with high-targeted doses are important for minimizing side effects and increasing efficacy. The motion control of microrobots in the blood circulation system is different from in vitro and the challenge lies in achieving precise counter-flow motion for targeted drug delivery without vascular blockage and immune rejection.

RESEARCH (2023)

Article Chemistry, Physical

2D colloids in rotating electric fields: A laboratory of strong tunable three-body interactions

Egor V. Yakovlev et al.

Summary: Many-body forces play a crucial role in the structure and dynamics of matter, but their understanding is limited by experimental challenges. A novel experimental system based on rotating electric fields allows precise control over many-body interactions between colloidal silica particles, revealing the critical influence of three-body interactions on phase diagram boundaries and the reversibility of phase transitions controlled by the external electric field magnitude.

JOURNAL OF COLLOID AND INTERFACE SCIENCE (2022)

Article Chemistry, Multidisciplinary

Molecular Dynamics Study on Regimes of Head-on Droplet Collision

Wenchuan Liu et al.

Summary: The study investigated the head-on collision of two water droplets in an atmospheric environment using molecular dynamics simulations. It found gas extrusion and gas molecules being captured between droplets, and proposed a periphery-sucking mechanism to explain certain phenomena. The analysis also showed the significant role of intermolecular hydrogen bonds in the splattering regime of the water droplets.

LANGMUIR (2022)

Article Nanoscience & Nanotechnology

Dielectrophoretic Characterization of Dynamic Microcapsules and Their Magnetophoretic Manipulation

Tom Elkeles et al.

Summary: This work presents the dielectrophoresis and in situ electrorotation characterization of reversible stimuli-responsive dynamic microcapsules that can change their physicochemical properties under varying pH conditions. The study shows that the conductivity of the capsules' shells is most influenced by pH and provides insight into the characteristic time scales of physical processes through transient response measurements. Additionally, the magnetic manipulation of microcapsules with embedded magnetic nanoparticles for lab-on-chip tasks is demonstrated, along with the on-chip determination of their physicochemical state using electrorotation.

ACS APPLIED MATERIALS & INTERFACES (2022)

Article Chemistry, Physical

The performance of OPC water model in prediction of the phase equilibria of methane hydrate

Xiluo Hao et al.

Summary: Molecular dynamics simulations were used to study the three-phase coexistence line of sI methane hydrates. Different water and methane models were employed at various pressures. The results showed that the TIP4P/Ice water model agreed well with experimental data at higher pressures, while the OPC water model showed deviations. The improved OPC model had a better prediction for the hydrate equilibrium temperature at 4 MPa.

JOURNAL OF CHEMICAL PHYSICS (2022)

Article Multidisciplinary Sciences

Triboelectric wetting for continuous droplet transport

Wanghuai Xu et al.

Summary: Liquid manipulation is important, and electrowetting on dielectric (EWOD) is a commonly used method. However, EWOD requires complex circuit control. Here, we develop an unexplored triboelectric wetting (TEW) phenomenon that directly uses triboelectric charges for precise water droplet control, eliminating the need for circuit control.

SCIENCE ADVANCES (2022)

Article Chemistry, Physical

Binary droplet interactions in shear water-in-oil emulsion: A molecular dynamics study

Wenchuan Liu et al.

Summary: This study investigates the shear field and binary droplet interaction regimes of water-in-oil emulsions between parallel gold plates using molecular dynamics (MD) methods. The effects of different pressures on the interactions were compared, and it was found that heptane forms adsorbed layers on the gold plates and creates a no-slip uniform shear field driven by the parallel plates. Three main binary droplet interaction regimes were identified: coalescence, temporary bridge formation, and sliding. The study provides insights into the understanding of binary droplet interactions in shear emulsions.

JOURNAL OF MOLECULAR LIQUIDS (2022)

Article Chemistry, Multidisciplinary

Surface-Mounted Dipolar Molecular Rotors Driven by External Electric Field, As Revealed by Torque Analyses

Yan-Ling Zhao et al.

Summary: By using quantum-mechanical computations in combination with torque analyses, we studied the rotational trend of surface-mounted dipolar rotors. The results showed that the lag angle between the dipolar arm and the E-field sensitively affected the magnitude and direction of torque vectors. Maintaining a specific lag angle was necessary for the unidirectional rotation of the rotors. Additionally, the thermal effect could significantly impact the rotation speed, with more flexible dipolar arms exhibiting a more rigid geometry in the E-field.

ACS OMEGA (2022)

Article Chemistry, Physical

The performance of OPC water model in prediction of the phase equilibria of methane hydrate

Xiluo Hao et al.

Summary: Molecular dynamics simulations were used to determine the three-phase coexistence line of sI methane hydrates at different pressures, showing significant discrepancies in performance between different water models in predicting this process.

JOURNAL OF CHEMICAL PHYSICS (2022)

Article Chemistry, Physical

Dynamic behaviors and self-cleaning property of droplet on superhydrophobic coating in uniform DC electric field

Shuai Ren et al.

Summary: This paper analyzes the self-cleaning property of superhydrophobic coating and the critical motion conditions of droplets in an electric field theoretically. An experimental platform was set up to observe droplet movement under the influence of an electric field, and the critical electric field strength for droplet motion was measured. The results show that the critical electric field strength for positive droplet motion is lower than that for negative droplets, and droplets can remove water-insoluble pollution particles under electric field drive. The theoretical calculation method of the sliding angle of superhydrophobic coating in a uniform DC electric field is in good agreement with experimental results.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2021)

Article Chemistry, Multidisciplinary

Dynamic Behavior of a Nanosized Water Droplet on the Stepped Surface with a Wetting Gradient

Tae Woo Kwon et al.

Summary: The study investigated the dynamic behavior of a nanosized water droplet on flat and stepped surfaces using molecular dynamics simulations. It was found that increasing wetting gradient allowed the water droplet to move smoothly, while increasing step height obstructed the water droplet from climbing. The dynamic behavior was classified into three types based on the variation of step height and adhesion energies between surfaces.

LANGMUIR (2021)

Article Chemistry, Medicinal

Systematic Comparison of the Structural and Dynamic Properties of Commonly Used Water Models for Molecular Dynamics Simulations

Sachini P. Kadaoluwa Pathirannahalage et al.

Summary: Water is a crucial solvent in biology and research, with many models available but none able to accurately reproduce all experimental properties. Careful selection of a water model is essential for specific studies of interest. Machine learning algorithms provide insights into the relationship between water model parameters and bulk properties, highlighting the challenges in developing a comprehensive water model.

JOURNAL OF CHEMICAL INFORMATION AND MODELING (2021)

Article Chemistry, Physical

Core-shell particles in rotating electric and magnetic fields: Designing tunable interactions via particle engineering

Kirill A. Komarov et al.

Summary: This study investigates the tunable interactions between composite particles with core-shell structure in a rotating electric field, showing that engineering the internal structure provides an effective tool for designing interactions. By generalizing an integral theory, the study reveals the main trends in interactions influenced by the structure.

JOURNAL OF CHEMICAL PHYSICS (2021)

Article Nanoscience & Nanotechnology

Furcated droplet motility on crystalline surfaces

Xin Tang et al.

Summary: A study reveals that droplets on piezoelectric crystal planes can self-propel in various directed motions without the need for chemical inhomogeneity or topological anisotropy. This effect is attributed to anisotropic crystalline structures and has broad applications in different fields.

NATURE NANOTECHNOLOGY (2021)

Article Chemistry, Multidisciplinary

Precise Droplet Manipulation Based on Surface Heterogeneity

Huizeng Li et al.

Summary: Researchers have achieved precise manipulation of droplet behavior using heterogeneous wettability surfaces, including strategies for droplet bouncing, dispensing, and adhesion. The nonuniformity of heterogeneous wettability substrates allows for accurate control of droplet position and morphology, and extends to applications in functional materials deposition and device fabrication.

ACCOUNTS OF MATERIALS RESEARCH (2021)

Article Multidisciplinary Sciences

Programmable droplet manipulation by a magnetic-actuated robot

An Li et al.

SCIENCE ADVANCES (2020)

Article Chemistry, Multidisciplinary

Efficiency of Electropumping in Nanochannels

David Ostler et al.

NANO LETTERS (2020)

Article Multidisciplinary Sciences

Capillary condensation under atomic-scale confinement

Qian Yang et al.

NATURE (2020)

Article Multidisciplinary Sciences

Spontaneous droplets gyrating via asymmetric self-splitting on heterogeneous surfaces

Huizeng Li et al.

NATURE COMMUNICATIONS (2019)

Article Nanoscience & Nanotechnology

Unidirectional Self-Driving Liquid Droplet Transport on a Monolayer Graphene-Covered Textured Substrate

Zhongqiang Zhang et al.

ACS APPLIED MATERIALS & INTERFACES (2019)

Article Multidisciplinary Sciences

Ionic-surfactant-mediated electro-dewetting for digital microfluidics

Jia Li et al.

NATURE (2019)

Article Chemistry, Physical

Effects of Radius and Length on the Nanomotor Rotors in Aqueous Solution Driven by the Rotating Electric Field

Zhongyu Fu et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2019)

Article Chemistry, Multidisciplinary

Droplet Microarrays: From Surface Patterning to High-Throughput Applications

Wenqian Feng et al.

ADVANCED MATERIALS (2018)

Article Multidisciplinary Sciences

Electrostatically driven fog collection using space charge injection

Maher Damak et al.

SCIENCE ADVANCES (2018)

Article Chemistry, Physical

Electropumping of Water in Functionalized Carbon Nanotubes Using Rotating Electric Fields

David Ostler et al.

JOURNAL OF PHYSICAL CHEMISTRY C (2017)

Article Multidisciplinary Sciences

Tunable two-dimensional assembly of colloidal particles in rotating electric fields

Egor V. Yakovlev et al.

SCIENTIFIC REPORTS (2017)

Article Nanoscience & Nanotechnology

Biobased High-Performance Rotary Micromotors for Individually Reconfigurable Micromachine Arrays and Microfluidic Applications

Kwanoh Kim et al.

ACS APPLIED MATERIALS & INTERFACES (2017)

Article Chemistry, Physical

Accuracy limit of rigid 3-point water models

Saeed Izadi et al.

JOURNAL OF CHEMICAL PHYSICS (2016)

Article Multidisciplinary Sciences

Combinatorial microfluidic droplet engineering for biomimetic material synthesis

Lukmaan A. Bawazer et al.

SCIENCE ADVANCES (2016)

Article Multidisciplinary Sciences

Robust self-cleaning surfaces that function when exposed to either air or oil

Yao Lu et al.

SCIENCE (2015)

Article Chemistry, Physical

Oscillation, pseudo-rotation and coalescence of sessile droplets in a rotating electric field

Osameh Ghazian et al.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS (2014)

Article Biochemical Research Methods

AC electric field induced dipole-based on-chip 3D cell rotation

Prateek Benhal et al.

LAB ON A CHIP (2014)

Article Multidisciplinary Sciences

Voltage-induced spreading and superspreading of liquids

G. McHale et al.

NATURE COMMUNICATIONS (2013)

Review Engineering, Chemical

Droplet Actuation by Electrowetting-on-Dielectric (EWOD): A Review

Wyatt C. Nelson et al.

JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY (2012)

Article Multidisciplinary Sciences

Micro-chemical synthesis of molecular probes on an electronic microfluidic device

Pei Yuin Keng et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2012)

Article Engineering, Mechanical

Active thermal management of on-chip hot spots using EWOD-driven droplet microfluidics

J. -T. Cheng et al.

EXPERIMENTS IN FLUIDS (2010)

Article Chemistry, Physical

Simple models for two-dimensional tunable colloidal crystals in rotating ac electric fields

Nils Elsner et al.

JOURNAL OF CHEMICAL PHYSICS (2009)

Article Chemistry, Multidisciplinary

PACKMOL: A Package for Building Initial Configurations for Molecular Dynamics Simulations

L. Martinez et al.

JOURNAL OF COMPUTATIONAL CHEMISTRY (2009)

Article Chemistry, Multidisciplinary

Picosecond melting of ice by an infrared laser pulse: A simulation study

Carl Caleman et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2008)

Article Chemistry, Physical

GROMACS 4: Algorithms for highly efficient, load-balanced, and scalable molecular simulation

Berk Hess et al.

JOURNAL OF CHEMICAL THEORY AND COMPUTATION (2008)

Review Biochemical Research Methods

Droplet microfluidics

Shia-Yen Teh et al.

LAB ON A CHIP (2008)

Article Mechanics

Axisymmetric deformation and stability of a viscous drop in a steady electric field

Etienne Lac et al.

JOURNAL OF FLUID MECHANICS (2007)

Article Physics, Multidisciplinary

Self-propelled Leidenfrost droplets

H Linke et al.

PHYSICAL REVIEW LETTERS (2006)

Review Chemistry, Multidisciplinary

GROMACS: Fast, flexible, and free

D Van der Spoel et al.

JOURNAL OF COMPUTATIONAL CHEMISTRY (2005)

Article Chemistry, Multidisciplinary

Molecular dynamics simulation of an electric field driven dipolar molecular rotor attached to a quartz glass surface

D Horinek et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2003)

Article Multidisciplinary Sciences

Molecular dynamics of a grid-mounted molecular dipolar rotor in a rotating electric field

J Vacek et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2001)

Review Biochemistry & Molecular Biology

GROMACS 3.0: a package for molecular simulation and trajectory analysis

E Lindahl et al.

JOURNAL OF MOLECULAR MODELING (2001)