Article
Chemistry, Physical
Zhixiang Chen, Yi Lu, Orlando J. Rojas, Fan Yang, Zhiqing Zhang, Qingxia Liu
Summary: In this research, a new slippery covalently attached liquids (SCAL) surface is developed to address the challenges of lubricant loss and dust fouling on slippery lubricant-infused porous surfaces (SLIPs). The SCALs exhibit long-lasting anti-fouling, hydrophobic and slippery effects, with ultra-low contact angle hysteresis for a wide range of fluids. The SCALs also show resistance to contamination, mechanical integrity, and light transmission, making them suitable for applications in bioengineering, power generation and water harvesting.
APPLIED SURFACE SCIENCE
(2022)
Review
Engineering, Multidisciplinary
Melika Farzam, Mohamadreza Beitollahpoor, Samuel. E. E. Solomon, Henry. S. S. Ashbaugh, Noshir. S. S. Pesika
Summary: This review discusses the fundamental science behind superhydrophobic surfaces developed by living organisms in nature, as well as the technologies and challenges associated with the fabrication and characterization of these surfaces.
Review
Polymer Science
Jasmine Buddingh, Atsushi Hozumi, Guojun Liu
Summary: Recent studies have shown that liquid and liquid-like surfaces offer excellent sliding properties for various liquids regardless of their surface tensions. These technologies are primarily evaluated based on their dynamic dewetting characteristics, preparation techniques, durability, and applicable functionalities. Future efforts should focus on balancing the durability of slippery properties with the simplicity/scalability and environmental impact of the design.
PROGRESS IN POLYMER SCIENCE
(2021)
Article
Thermodynamics
B. B. Kazemian, P. Cheng
Summary: A variable solid-fluid interaction strength scheme compatible with the lattice Boltzmann method is introduced to investigate contact angle hysteresis phenomena numerically. The method is demonstrated to accurately reproduce the observed behaviors during droplet sliding and evaporation processes, and the results are in agreement with previous experimental investigations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Chemical
Shungo Natsui, Kazui Tonya, Daiki Nakajima, Tatsuya Kikuchi, Hiroshi Nogami
Summary: This study investigated the dynamic contact angle and interaction between solid-liquid-gas phases as water droplets moved on a superhydrophobic surface, modeling the droplets using a friction model and momentum attenuation to reveal pinning/unpinning behavior. The research contributes to understanding the slippery/sticky contact line characteristics at the macroscopic continuum fluid scale.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Zheng Gong, Zhenpeng Su, Xiaofeng Liu, Di Pan, Jie Liu, Huai Zheng, Sang Woo Joo
Summary: This study demonstrates a method for controlling high-speed droplet transport on lubricated surfaces, with the induced lubrication film flow by charge deposition being the dominating factor. This new method opens a new path for high-performance manipulation of liquid droplets by controlling the lubrication liquid film flow with charge deposition.
Article
Nuclear Science & Technology
Jiejin Cai, Facheng Chen, Nikolaos T. Chamakos, Athanasios G. Papathanasiou, Bing Tan, Qiong Li
Summary: In this study, a computational model based on disjoining pressure is developed to investigate the asymmetric evaporation of droplets on an inclined substrate. The model combines the disjoining pressure with the arbitrary Lagrange-Euler method to describe the solid-liquid interaction and study the contact angle hysteresis during evaporation. The results show good agreement with experimental data, and the model can simulate different droplet evaporation modes.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Yajie Song, Qi Wang, Yushan Ying, Zhuo You, Songbai Wang, Jiang Chun, Xuehu Ma, Rongfu Wen
Summary: This paper investigates the dynamic interactions of droplets impacting on solid surfaces and specifically explores the factors influencing the spreading characteristics of droplets on ultra-slippery hydrophilic surfaces. The results show that the contact angle and We have a significant impact on the maximum spreading factor of droplets; low contact angle hysteresis can decrease the time required to reach the maximum spreading diameter and the time interval at which it is maintained; an increase in inclination angle and We leads to longer gliding distance of the impacting droplet, and ultra-low contact angle hysteresis allows the droplet to continuously slip on the ultra-slippery hydrophilic surface.
Article
Nanoscience & Nanotechnology
Deepak Monga, Zongqi Guo, Li Shan, Seyed Adib Taba, Jyotirmoy Sarma, Xianming Dai
Summary: This study introduces a method for sustainable high-performance dropwise condensation on durable quasi-liquid surfaces. By chemically bonding quasi-liquid polymer molecules on solid substrates, the heat-transfer coefficient is significantly improved with ultra-low contact angle hysteresis and extraordinary durability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Alvin C. M. Shek, Ciro Semprebon, Jack R. Panter, Halim Kusumaatmaja
Summary: A study on two-component capillary bridges formed between liquid-infused surfaces (LIS) reveals various morphologies depending on contact with the droplet; capillary force and adhesion strength are influenced by lubricant ridge shape and size; tuning parameters like lubricant pressure and contact angles can enhance effective capillary adhesion strength.
Editorial Material
Chemistry, Multidisciplinary
Shuai Li, Hans-Juergen Butt
Summary: Fast removal of water drops from solid surfaces is important in many applications. The reduction in lateral adhesion of water drops on PDMS brush surfaces after exposure to various organic vapors was reported and attributed to the physisorption of vapor and swelling of the PDMS brushes. Contact angles of water drops on three hydrophobic surfaces in different vapors are measured to determine the contribution of vapor adsorption and change in interfacial tensions on drop adhesion. The findings show that vapor-induced change in interfacial tensions can explain the decrease in contact angles, while vapor adsorption into PDMS surfaces forms a lubricating layer, reducing contact angle hysteresis.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Satoshi Nakamura, Hiroshi Kakiuchida, Masahisa Okada, Atsushi Hozumi
Summary: This article reports a facile method for preparing surfaces that are statically very hydrophilic but dynamically hydrophobic, and exhibit excellent water sliding performance using a sol-gel method and alkali-treatment.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Mechanics
Ahmed Islam, Yongsheng Lian
Summary: In this study, we numerically investigate the cloaking of water drops by lubricants during drop impact on slippery surfaces at various speeds. Our findings reveal that cloaking occurs when interfacial tensions between lubricant and water are low and impact speeds are low. We also observe that the thickness of the lubricant layer surrounding the drop changes over time. At moderate impact speeds (0.25 and 0.5 m/s), a significant amount of lubricant is displaced, creating a lubricant-water jet. At high impact speeds (5 and 30 m/s), a secondary impingement occurs, revealing the underlying substrate. Additionally, we examine the impact of drops on lubricant-infused micro-wells with different spacing. We find that small spacing between the walls of the micro-wells limits lubricant drainage and displacement, leading to reduced splashing compared to substrates without micro-wells. Furthermore, micro-wells are better at preserving lubricants.
Article
Multidisciplinary Sciences
Fang Wang, Meijin Liu, Cong Liu, Qilong Zhao, Ting Wang, Zuankai Wang, Xuemin Du
Summary: Slippery lubricant-infused porous (SLIPS) and superhydrophobic surfaces have emerged as promising interfacial materials. We developed a class of slippery material that harnesses the dual advantages of both solid and lubricant by constructing a photothermal-responsive composite matrix with real-time light-induced surface charge regeneration capability. The resulting light-induced charged slippery surface (LICS) allows for photocontrol of droplets with fast speed, long distance, antigravity motion, and directionally collective motion. The LICS is further extended to biomedical domains for specific morphological hydrogel bead formation and biological diagnosis and analysis.
Article
Engineering, Environmental
Xing Han, Xin Tang, Rifei Chen, Wei Li, Pingan Zhu, Liqiu Wang
Summary: A citrus-peel-like micro-cavity structure was proposed for designing durable SLIPS, demonstrating enhanced durability and precise droplet manipulation. The structure is beneficial for various applications in need of loss-free, contamination-free, and programmable droplet manipulation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Yufeng Zhu, Glen McHale, Jack Dawson, Steven Armstrong, Gary Wells, Rui Han, Hongzhong Liu, Waldemar Vollmer, Paul Stoodley, Nicholas Jakubovics, Jinju Chen
Summary: Biofilms are a major concern in various fields and the development of effective anti-biofilm strategies is crucial. This study presents the use of slippery omniphobic covalently attached liquid (SOCAL) surfaces as a stable antibiofilm strategy under shear stress. The SOCAL surface significantly reduces biofilm formation of key pathogens, offering a promising solution to biofilm-related issues in medical devices and other applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Glen McHale, Nan Gao, Gary G. Wells, Hernan Barrio-Zhang, Rodrigo Ledesma-Aguilar
Summary: This study investigates the friction characteristics of liquid on solid surfaces, defines friction coefficients for droplets and contact lines, and analogizes them with Amontons' laws. By utilizing surface free energy considerations, it is found that the frictional force is directly proportional to the surface tension force. These findings have important implications for the design of superhydrophobic surfaces and the control of droplet motion.
Article
Materials Science, Coatings & Films
Hua-Feng Pang, Ran Tao, Jingting Luo, Xiaosong Zhou, Jian Zhou, Glen McHale, Julien Reboud, Hamdi Torun, Desmond Gibson, Kai Tao, Honglong Chang, Yong-Qing Fu
Summary: In this study, large-area and uniformly inclined piezoelectric ZnO films were successfully fabricated using a glancing angle deposition method. The films exhibited dual-mode surface acoustic waves, including Rayleigh waves and shear-horizontal waves. The Rayleigh waves enabled efficient acoustofluidic functions, while the shear-horizontal waves were utilized for biosensing. These findings are significant for lab-on-a-chip applications.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Glen McHale, Nasser Afify, Steven Armstrong, Gary G. Wells, Rodrigo Ledesma-Aguilar
Summary: Liquid-liquid interfacial tensions can be deduced from the apparent contact angles on SLIPS, providing valuable insight into liquid-liquid interactions and the wetting of a liquid surface by another liquid.
Article
Chemistry, Multidisciplinary
Deyu Yang, Luke Haworth, Prashant Agrawal, Ran Tao, Glen McHale, Hamdi Torun, James Martin, Jingting Luo, Xianghui Hou, YongQing Fu
Summary: This study systematically investigated the accretion and removal of porous rime ice from structural surfaces activated by surface acoustic waves (SAWs). The results showed that the icing and de-icing processes are closely linked with the dynamic interfacial phase and structure changes of rime ice under SAW activation and the acousto-thermally induced localized heating that facilitates ice melting. The interaction of SAWs with the thin water layer formed at the ice/structure interface resulted in significant streaming effects, leading to further damage and melting of ice.
Article
Nanoscience & Nanotechnology
Anam Abbas, Gary G. Wells, Glen McHale, Khellil Sefiane, Daniel Orejon
Summary: Wetting is crucial in the interactions between liquids and solid surfaces, and can be controlled by modifying the chemistry and structures of the surface. This study investigates the grafting of silicone oil with different viscosities and layers on smooth silicon substrates, and demonstrates the fabrication of low-contact line-pinning hydrophobic surfaces with high contact angles and low contact angle hysteresis. The findings provide a basis for selecting appropriate silicone oil grafting methods and parameters for specific applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Alex Jenkins, Gary G. G. Wells, Rodrigo Ledesma-Aguilar, Daniel Orejon, Steven Armstrong, Glen McHale
Summary: The evaporation of sessile droplets on a surface is affected by factors such as surface wettability, environment, contact angle hysteresis, and surface roughness. The presence of constituents and impurities in non-pure liquids complicates the evaporation characteristics of droplets. This study demonstrates that by using smooth surfaces with low contact angle hysteresis, the crystallization of saline droplets can be suppressed, leading to stable droplets above the saturation concentration. These findings have implications for heat and mass transfer in low humidity environments.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Mehdi H. Biroun, Luke Haworth, Hossein Abdolnezhad, Arash Khosravi, Prashant Agrawal, Glen McHale, Hamdi Torun, Ciro Semprebon, Masoud Jabbari, Yong-Qing Fu
Summary: Droplet impact behavior on solid surfaces is crucial for industrial applications such as spray coating, food production, printing, and agriculture. The challenge lies in modifying and controlling the impact regime and contact time of the droplets, which becomes more critical for non-Newtonian liquids. This study explores the impact dynamics of non-Newtonian liquids on superhydrophobic surfaces and shows that the addition of Xanthan alters the shape and reduces the contact time of the droplets.
Review
Physics, Applied
Jian Zhou, Yihao Guo, Yong Wang, Zhangbin Ji, Qian Zhang, Fenglin Zhuo, Jingting Luo, Ran Tao, Jin Xie, Julien Reboud, Glen McHale, Shurong Dong, Jikui Luo, Huigao Duan, Yongqing Fu
Summary: Flexible and wearable acoustic wave technology has gained tremendous attention due to its wide applications in wearable electronics, sensing, acoustofluidics, and lab-on-a-chip. This review provides an overview of the advances in fundamental principles, design, fabrication, and applications of flexible and wearable acoustic wave devices. The challenges in material selections and structural designs for high-performance devices are discussed, along with recent advances in fabrication strategies and performance evaluation. Key applications in wearable sensors, acoustofluidics, and lab-on-a-chip systems are highlighted, and future perspectives in this field are discussed.
APPLIED PHYSICS REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Luke Haworth, Deyu Yang, Prashant Agrawal, Hamdi Torun, Xianghui Hou, Glen McHale, Yongqing Fu
Summary: Ice nucleation and accretion on structural surfaces are major safety and operational concerns. Various methods are used to tackle this issue, and in this study, the ice adhesion properties of different coated substrates were explored. Among the studied surfaces, the SOCAL coating with flexible polymer brushes and liquid-like structure significantly reduced ice adhesion. This reduction is attributed to the flexible nature of the brush-like structures, allowing ice to detach easily.
NANOTECHNOLOGY AND PRECISION ENGINEERING
(2023)
Article
Physics, Applied
H. Y. Erbil, G. McHale
Summary: In recent years, there has been extensive research on synthetic superhydrophobic surfaces, which possess unique anti-wetting properties. Apart from their stay-dry and self-cleaning properties, the evaporation process of water droplets has also attracted significant interest. Studies on surface contamination and droplet evaporation during the Covid-19 pandemic have gained attention. Superhydrophobic surfaces alter the contact between droplets and the substrate/environment, and affect the diffusion of vapor.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Glen McHale, Rodrigo Ledesma-Aguilar, Chiara Neto
Summary: In 1948, Cassie proposed an equation for the wetting of a smooth, heterogeneous surface. This equation uses weighted averages based on the fractional surface areas and cosines of contact angles to predict the contact angle of a droplet on a composite surface. The equation has proven fundamental in understanding the wetting of superhydrophobic and superoleophobic surfaces. However, little attention has been given to the complete wetting of one surface component.
Article
Chemistry, Multidisciplinary
Michele Pelizzari, Glen McHale, Steven Armstrong, Hongyu Zhao, Rodrigo Ledesma-Aguilar, Gary G. Wells, Halim Kusumaatmaja
Summary: This study presents a new method to create patterned liquid lubricant surfaces, demonstrates low-friction droplet self-propulsion on such surfaces, and sheds light on the interactions between liquid droplets and liquid surfaces.