Article
Chemistry, Physical
Gomathi Rajalakshmi Seetharaman, Jitendra S. Sangwai
Summary: The interaction between salts (such as NaCl and CaCl2) and alkali (such as NaOH and Na2CO3) on the interfacial tension (IFT) and wettability of the quartz substrate is investigated. It is observed that the lowsal (NaCl)-alkali (NaOH, Na2CO3) formulation effectively reduces the IFT of basic model oil-water and aliphatic-water system than the individual effect of alkali and salts. The lowsal (NaCl)-alkali formulation completely sweeps the hydrocarbon from the quartz substrate by imparting Marangoni force, resulting in the visual removal of crude oil droplets for the first time using this system.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Mechanics
Henry Rodriguez-Broadbent, Darren G. Crowdy
Summary: At high surface Peclet numbers, the presence of surfactants can lead to surface immobilization, but a different mechanism is proposed for longitudinal shear flow along a unidirectional trench at high Marangoni numbers, where the meniscus becomes a constant-shear-stress surface due to contamination by surfactant. Experimental observations support the presence of recirculating interfacial flows on the meniscus. By calculating slip lengths, it is shown that the effective immobilization of the surfaces with vortical flows on the meniscus highlights the caution needed when comparing theory and experiments based on effective slip properties alone.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Samuel D. Tomlinson, Frederic Gibou, Paolo Luzzatto-Fegiz, Fernando Temprano-Coleto, Oliver. E. E. Jensen, Julien. R. R. Landel
Summary: This study investigates the effect of soluble surfactant on the performance of superhydrophobic surfaces (SHSs) in drag reduction applications. By analyzing the transport of surfactant in a three-dimensional laminar channel flow, a one-dimensional model is derived to predict drag reduction and surfactant distribution. The importance of this study lies in providing insights into the underlying physics of the drag reduction effect through analysis of velocity field and surfactant concentrations.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Thermodynamics
Shubha Agrawal, Prasanta K. Das, Purbarun Dhar
Summary: This study demonstrates the interaction between substrate topology, temperature stimulus, and wall slip in generating thermo-capillarity in thin liquid films. Analytical solutions for the thermal and hydrodynamic fields are obtained. The significance of different parameters on the thermo-fluid dynamics is also explored.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Multidisciplinary
Danting Xue, Ruigang Zhang, Quansheng Liu, Zhaodong Ding
Summary: The effect of odd viscosity on the instability of liquid film along a wavy inclined bottom with linear temperature variation is investigated in this study. The non-linear evolution equation of the free surface is derived using the long-wave approximation. The linear and weakly non-linear instability of thin film flow are investigated using the normal mode method and multi-scale analysis methods, respectively. The results demonstrate that the Marangoni effect caused by non-uniform temperature distribution enhances the instability of the liquid film, while the odd viscosity has a stabilizing effect. Furthermore, the local inclination angle and bottom steepness also impact the instability of the liquid film flow. The results are validated through numerical simulations of the non-linear evolution equations.
Article
Mechanics
Berin Seta, Diana Dubert, Josefa Gavalda, Jaume Massons, Mounir M. M. Bou-Ali, Xavier Ruiz, Valentina Shevtsova
Summary: Thermocapillary convection enhances heat transfer of phase change materials (PCMs) in microgravity. A numerical investigation is conducted to study the nonlinear dynamics of melting PCM in a cylindrical container filled with n-octadecane and surrounded by passive air. The effect of thermocapillary convection on heat transfer and melting front topology is examined by varying the applied temperature difference and heat transfer through the interface. A new mathematical approach is proposed to analyze the emerging hydrothermal waves (HTWs) and explore their coupling with heat gain/loss through the interface over time.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Nanoscience & Nanotechnology
Min-Yeong Choi, Chang-Won Choi, Seong-Jun Yang, Hojeong Lee, Shinyoung Choi, Jun-Ho Park, Jong Heo, Si-Young Choi, Cheol-Joo Kim
Summary: Controlling the growth mode of MoS2 on different substrates allows for efficient control over the domain structures, resulting in either large-crystalline or nanocrystalline domains. The MoS2 films with nanocrystalline domains exhibit efficient hydrogen evolution reactions, while the films with large domains have better electron conductivity.
ACS APPLIED NANO MATERIALS
(2022)
Article
Thermodynamics
A. H. Saifi, M. K. Tripathi
Summary: This study investigates the heat transfer and circulation patterns of a liquid bridge constrained between two insulated discs and surrounded by another immiscible liquid. The position of the heating or cooling ring is found to affect the heat transfer rate, with an increase observed when the ring is placed near the bottom or top disc. However, the net heat transferred is not a monotonic function of the ring position. The results provide insights into the heat transfer characteristics of such systems and have implications for various applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Biophysics
Elizabeth Anne Pumford, Shekh Mojibur Rahman, Vladimir Hlady
Summary: This study investigates platelet translocation on platelet-binding proteins and found that upstream exposure to specific proteins increases downstream platelet-protein interactions, leading to increased adhesion. This upstream priming also reduces average platelet velocity and affects the duration of transient platelet arrests on the protein-coated surface, demonstrating the importance of priming in regulating platelet behavior.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2021)
Article
Engineering, Chemical
Ioannis Kiratzis, Nina M. Kovalchuk, Mark J. H. Simmons, Daniele Vigolo
Summary: The study investigated droplet formation in a flow focusing microfluidic device for capillary numbers between 10^(-4) and 10^(-1). Results showed that droplet size decreased with an increase of the capillary number, and the neck thinning rate during necking depended on surfactant concentration. During necking, velocities along the neck interface were smaller for surfactant laden cases due to Marangoni phenomena.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
R. Egorov, S. Y. Misyura, V. S. Morozov, A. S. Zaitsev
Summary: This experimental study investigates the aggregation of TiO2 microparticles and the self-organization of clusters in a thin layer of water. The complex behavior of the cluster, with periodic changes in particle sizes and cell numbers, is observed under local heating. Furthermore, it is shown that stability of convective cells is lost and the cluster disintegrates partially when particle and coagulated particle diameters reach their maximum.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Analytical
Todd A. Duncombe, Aaron Ponti, Florian P. Seebeck, Petra S. Dittrich
Summary: The UV-vis spectra-activated droplet sorter (UVADS) is a new tool for high-throughput label-free chemical identification and enzyme screening. It collects full UV-vis spectra, processes data quickly, and sorts droplets for analysis. This technology can distinguish different chemicals and measure enzyme activity.
ANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Chemical
S. Y. Misyura, R. Egorov, V. S. Morozov, A. S. Zaitsev
Summary: Local laser heating of the liquid film leads to simultaneous self-organization of cellular convective structures and micron-scale particles, forming hexagonal clusters. The liquid film, which is ten times the diameter of the convective cells, does not form toroidal structures, with convective cells only forming near the heating center.
Article
Thermodynamics
Zhe Huang, Deqiang Li, Jing Zhao, Qifei Jian
Summary: In this paper, a 3D transient numerical model of ultra-thin vapor chamber (UTVC) is established to study its performance. The influence of the Marangoni effect on the evaporation process is discussed. The numerical analysis shows that the UTVC has rapid transient thermal response time. Comparing different copper column models, suggestions for improving the thermal performance of UTVC are provided.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Gbocho Gilles Soboh, Quy-Dong To, Irina Graur, Frederic Topin, Vincent Monchiet, Celine Leonard
Summary: In this paper, the Molecular Dynamics method was used to simulate the equilibrium vapor-liquid methane and investigate the condensation process and momentum exchange at the atomic level. By analyzing various parameters, the mass and velocity accommodation coefficients can be determined. The results are influenced by temperature, film thickness, and collision rate.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Chemistry, Physical
Zhenkun Gu, Ying Wang, Shiheng Wang, Ting Zhang, Rudai Zhao, Xiaotian Hu, Zhandong Huang, Meng Su, Qun Xu, Lihong Li, Yiqiang Zhang, Yanlin Song
Summary: A facile method to print large-scale perovskite films with high quality for flexible photodetectors is reported in this study, by introducing a soluble polyethylene oxide (PEO) layer during the inkjet printing process to control the nucleation and crystal growth of perovskite. The printed perovskite films show excellent mechanical performance and high quality, opening up new opportunities for the fabrication of diverse wearable optoelectronic devices.
Article
Nanoscience & Nanotechnology
Jiangkun Wei, Yingqi Liang, Xingdi Chen, Stanislav N. Gorb, Zhigang Wu, Huizeng Li, Jianing Wu
Summary: Honey bee tongues have stiff and hydrophobic hairs which enhance their flexibility and adaptability to different environments. This finding could provide new insights for designing flexible fiber systems for transporting viscous liquids.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Multidisciplinary Sciences
An Li, Huizeng Li, Zhipeng Zhao, Luanluan Xue, Zheng Li, Kaixuan Li, Mingzhu Li, Yanlin Song
Summary: The floating states of objects are important in various fields, but real-time regulation of these states is challenging. By analyzing the floating states of fruits, it is found that these states are caused by three-segment three-phase contact line dynamics. A buoyancy hysteresis loop is proposed for the transformation of floating states. The transformation of floating states has potential applications in water evaporation and interface catalysis.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Chang Li, Yafeng Yu, Huizeng Li, Haisong Lin, Huanqing Cui, Yi Pan, Ruotong Zhang, Yanlin Song, Ho Cheung Shum
Summary: The heterogeneous self-assembly of a single type of nanoparticle is achieved by quickly evaporating a colloid-poly(ethylene glycol) (PEG) droplet, facilitated by the spatial confinement induced by a skin layer. This approach allows for the formation of face-centered-cubic (FCC) lattices with different plane orientations, generating binary bandgaps and structural colors. The self-assembly of nanoparticles can be regulated by adjusting the PEG concentration, and the method is applicable to various droplet shapes, substrates, and nanoparticle types.
Article
Physics, Applied
Ping Han, Zhan-Dong Huang, Hao-Wen Dong, Sheng-Dong Zhao
Summary: We developed a reflective broadband acoustic coding metasurface utilizing bubble units. The reflected phase difference between the cube bubble unit and pure water unit is approximately pi across a wide range of frequencies. The broadband phenomenon is explained by the reflection theory between the soft water-air interface and the hard water-rigid interface. The relative bandwidth achieved is 187%, close to the theoretical limit of 200%. By reconstructing the 0/1 sequence, we conducted numerical simulations on broadband acoustic focusing and diffusing reflection. The research in this work has potential applications in enhancing underwater communication and cloaking.
APPLIED PHYSICS EXPRESS
(2023)
Article
Chemistry, Physical
Zhenkun Gu, Yingjie Zhao, Yiqiang Zhang, Zhandong Huang, Zhonghao Zhou, Kang Wang, Lihong Li, Yong Sheng Zhao, Qun Xu, Yanlin Song
Summary: In this study, a facile printing strategy was reported to controllably fabricate perovskite single-crystal arrays with well-defined morphology and location. By modulating perovskite precursor ion aggregation in microdroplets through controlling the temperature of substrates, perovskite single-crystal arrays with controlled morphologies are fabricated and selectively integrated on silicon for high-performance tailored laser arrays. Additionally, integrated perovskite single-crystal microstructures were printed, showing efficient coupling property with well-maintained intrinsic characters of the original signals. This strategy enables fully inkjet-printed morphology-controllable perovskite single-crystal arrays and functional coupling-structure arrays, which offers new opportunities for integrated photonic and optoelectronic devices.
CHEMISTRY OF MATERIALS
(2023)
Article
Multidisciplinary Sciences
An Li, Huizeng Li, Sijia Lyu, Zhipeng Zhao, Luanluan Xue, Zheng Li, Kaixuan Li, Mingzhu Li, Chao Sun, Yanlin Song
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, Physical
Zhipeng Zhao, Huizeng Li, An Li, Lu Liu, Luanluan Xue, Zheren Cai, Renxuan Yuan, Xinye Yu, Yanlin Song
Summary: In recent years, there has been significant progress in the collection and utilization of water power as clean energy, particularly in the field of droplet-based triboelectric power generation. However, the low power output in the droplet-based single-electrode triboelectric generation mode limits its practical applications. This study demonstrates that the droplet-based bi-electrode freestanding TENG (DBE-TENG) shows great potential for enhancing the output, and proposes an asymmetrical-capacitance-induced charge transfer mechanism that explains the current output enhancement and sinusoidal-like variation. The findings deepen our understanding of bi-electrode triboelectric nanogenerators and have implications for improving the efficiency of sustainable energy harvesting.
Article
Multidisciplinary Sciences
Zhiyuan Qu, Peng Zhou, Fanyi Min, Shengnan Chen, Mengmeng Guo, Zhandong Huang, Shiyang Ji, Yongli Yan, Xiaodong Yin, Hanqiu Jiang, Yubin Ke, Yong Sheng Zhao, Xuehai Yan, Yali Qiao, Yanlin Song
Summary: We propose a bubble-template molecular printing concept that utilizes ultrathin liquid films to confine the self-assembly of molecules, achieving high-precision assembly at the molecular scale.
Article
Physics, Applied
Xiaobing Cai, Chunguang Wang, Zhandong Huang, Peipei Jia, Jun Yang, Liwen Zhang
Summary: Voice acquisition and recognition are important for seamless and hands-free human-machine interaction. A method to enhance the signal to noise ratio is demonstrated by using an acoustic metamaterial in front of a microphone, amplifying the evanescent portion of human voice. This passive and physical means provides an alternative to traditional active and algorithmic methods for improving voice sound acquisition.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Zhiyuan Sun, Chao Dong, Bingda Chen, Wenbo Li, Huiyuan Hu, Jinsheng Zhou, Chong Li, Zhandong Huang
Summary: A strong and tough conductive polymer hydrogel with excellent anti-swelling properties is developed by incorporating hydrogen, coordination bonds, and cation-π interactions between a rigid conducting polymer and a soft hydrogel matrix. The obtained supramolecular hydrogel has remarkable tensile strength (1.63 MPa), superior elongation at break (453%), and remarkable toughness (5.5 MJ m(-3)). As a strain sensor, the hydrogel possesses high electrical conductivity (2.16 S m(-1)), a wide strain linear detection range (0-400%), and excellent sensitivity (gauge factor = 4.1), sufficient to monitor human activities with different strain windows. Furthermore, this hydrogel with high swelling resistance has been successfully applied to underwater sensors for monitoring frog swimming and underwater communication.
Review
Chemistry, Multidisciplinary
Yan Zhan, Chang Li, Zhigang Che, Ho Cheung Shum, Xiaotian Hu, Huizeng Li
Summary: Benefiting from their superior photophysical properties and low-cost crystalline substances, perovskites have emerged as competitive photoactive semiconductors for optoelectronic devices. Photon management is crucial for perovskites due to their direct band gap and high refractive index. Photonic structures with periodic features offer efficient means to manage light through the interaction between media and photons. This review discusses strategies of photon management in perovskite optoelectronics and summarizes the design and implementation progress of photonic elements for high-index perovskites. Proposals and guidelines for high-performance multifunctional perovskite optoelectronics are also provided.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Acoustics
Xiaobing Cai, Zhandong Huang, Chunguang Wang, Peipei Jia, Jun Yang, Liwen Zhang
Summary: In this study, we propose an ultrathin and holeless metasurface composed of simply a pair of membranes, which supports duo unity transmissions with completely conjugate phase shifts occurring at two extremely close frequencies. This metasurface enables giant phase delay and high refractive index (n = 18) for acoustic waves, allowing for wavefront control and applications such as planar lens focusing, negative refraction, negative reflection, and directional emission. The design principle of acoustic metasurface opens up promising avenues for acoustic wave manipulation with extensive applications in beam steering, acoustic imaging, energy harvesting, and surface waves.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2023)