Article
Mechanics
Shi-Zheng Wang, Xianfu Huang, Longquan Chen, Ying-Song Yu
Summary: Water droplets impinging on micro-grooved polydimethylsiloxane surfaces were investigated, and various phenomena including no bouncing, complete rebound, bouncing occurring with droplet breakup, partial rebound, and sticky state were observed depending on the impact velocity and surface roughness. The lower limit of impact velocity for bouncing droplets was determined by balancing the droplet's kinetic energy with the energy barrier caused by contact angle hysteresis. The upper limit of impact velocity was predicted by recording droplet impact at an ultrahigh speed and correlating the transition from complete rebound to bouncing with the wetting state transition. A theoretical model was developed to predict the upper limit of impact velocity by considering the liquid penetration into the micro-grooves. Additionally, the contact time of bouncing droplets decreased with decreasing Weber number, while surface roughness had a minor influence on the contact time in the experiments.
Article
Chemistry, Physical
Jinming Zhang, Wei Ding, Uwe Hampel
Summary: This study deconstructs a complex surface defect into three primary surface defects and uses large-scale Molecular Dynamics simulations to investigate the mechanisms of droplet-solid static friction forces induced by these defects. Three element-wise static friction forces related to the primary surface defects are revealed, and it is found that the static friction force induced by chemical heterogeneity is contact line length dependent while the static friction force induced by atomic structure and topographical defect is contact area dependent. The latter causes energy dissipation and leads to a wiggle movement of the droplet during the static-kinetic friction transition.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Thermodynamics
Datta Prasad, Susmita Dash
Summary: In this study, a theoretical model is proposed to determine the total heat transfer to a Leidenfrost droplet on microtextured substrates, considering the curved shape of the liquid-vapor interface. The results show that the vapor gap and flow field beneath the Leidenfrost droplet on a microtextured substrate depend on the substrate morphology, and the shape of the liquid-vapor interface influences the evaporation rate on the substrate.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Chemistry, Physical
P. Xu, J. R. Bai, P. Zhou, L. L. Wang, X. N. Sun, L. Wei, Q. F. Zhou
Summary: A physical model was proposed to investigate the wettability of various microtextured surfaces, particularly superhydrophobicity. It was found that the sidewall angle restricted the contact angle of the microstructures, and re-entrant structures played a crucial role in the transition from hydrophilicity to superhydrophobicity.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Physics, Multidisciplinary
Jing Lou, SongLin Shi, Chen Ma, CunJing Lv, QuanShui Zheng
Summary: In this study, a new wetting state called the suspended penetration wetting state was identified, where the droplet can penetrate the micropillars on textured surfaces without touching the base. Experimental results showed that the droplet can spontaneously recover to the initial wetting state when the external pressure is removed.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Multidisciplinary Sciences
Dieter A. Baumgartner, Samira Shiri, Shayandev Sinha, Stefan Karpitschka, Nate J. Cira
Summary: This study explores the rich dynamics of fully miscible, three-component droplets composed of water, ethanol, and propylene glycol on completely wetting glass substrates. The research finds that evaporation changes the composition and shape of the droplet, altering its spreading behavior. This research has practical significance in the collection, aggregation, and removal of contaminants.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Review
Engineering, Multidisciplinary
Peng Xu, Yurong Zhang, Lijun Li, Zhen Lin, Bo Zhu, Wenhui Chen, Gang Li, Hongtao Liu, Kangjian Xiao, Yunhe Xiong, Sixing Yang, Yifeng Lei, Longjian Xue
Summary: This review provides an overview of the research progress on the adhesion behaviors of droplets on surfaces. It covers the construction of bioinspired superhydrophobic surfaces with different adhesion states, the fundamental theories of droplet adhesion, techniques to characterize droplet adhesion, wetting behaviors and the switching between different adhesion states, applications of bioinspired surfaces, and future research challenges and applications.
BIOINSPIRATION & BIOMIMETICS
(2022)
Article
Chemistry, Physical
Xiang Zhang, Azhen Du, Yongsheng Luo, Cunjing Lv, Yu Shrike Zhang, Shujie Yan, Yuanda Wu, Jingjiang Qiu, Yong He, Lixia Wang, Qian Li
Summary: Controlling the morphology and spreading behavior of liquids on solid surfaces can be achieved by designing hydrophilic micropillar arrays. The arrangement and shape of the micropillars play a crucial role in determining the shape of the liquid droplet and the spreading pattern. Surface energy barriers caused by micropillar edges were found to be key factors influencing the anisotropic spreading of the liquid.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Chemical
Himanshu Pathak, Tibin M. Thomas, Pallab Sinha Mahapatra
Summary: This study investigated the condensation processes of liquid droplets on soft surfaces and found that lower shear modulus of the soft surface led to higher droplet coverage and larger condensate droplet size. Regardless of the shear moduli of the substrates, the relaxation time of coalescing droplets followed a linear trend with the drop equilibrium size, with softer substrates exhibiting higher relaxation time.
CHEMICAL ENGINEERING SCIENCE
(2022)
Review
Engineering, Environmental
Yue Fan, Yao Tan, Yingying Dou, Shilin Huang, Xuelin Tian
Summary: This review systematically summarizes the research progress in reducing the contact time of impacting droplets on superhydrophobic surfaces, including droplet impact theory, classification of strategies to reduce contact time, and representative applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Mattia Carneri, Davide Ferraro, Afshin Azarpour, Alessio Meggiolaro, Sebastian Cremaschini, Daniele Filippi, Matteo Pierno, Giuliano Zanchetta, Giampaolo Mistura
Summary: The use of highly slippery lubricated surfaces can facilitate the movement of high-viscosity YSF droplets. The droplets slide on the lubricated surfaces and roll down when their descending speed increases, especially at high inclinations and low concentrations.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Mechanics
Yujuan Chen, Xianmin Xu
Summary: Theoretical study on the self-propulsion dynamics of a small droplet on general curved surfaces leads to a new reduced model that quantitatively describes the motion of droplets. The model includes a scaling law for droplet displacement with respect to time on the outside surface of a cone. The theoretical results are in good agreement with experimental data without adjusting the friction coefficient in the model.
Article
Chemistry, Physical
Georg Schnell, Christian Polley, Robert Thomas, Stephan Bartling, Johannes Wagner, Armin Springer, Hermann Seitz
Summary: In this study, the researchers used a customized instrument to investigate the lateral adhesion forces on femtosecond laser-structured surfaces. They found that the droplet motion was significantly influenced by the chemical and topographical surface features. The droplet mobility was classified into static, transfer, and kinetic regimes, which is crucial for designing surfaces with extreme wetting characteristics.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Caroline McCue, Adel Atari, Sean Parks, Yuen-Yi Tseng, Kripa K. K. Varanasi
Summary: Trypsin has been the primary method of cell dissociation for a century, but there has been little change to the process. Enzymatic cell detachment strategies can be labor-intensive and generate waste, so researchers have developed microtextured polystyrene surfaces to lower cell adhesion strength. These surfaces enable decreased cell adhesion strength while maintaining cell viability and proliferation.
Article
Engineering, Environmental
Hanpeng Gao, Siyu Chang, Yan Liu, Zong Meng, Zhiwu Han, Luquan Ren
Summary: By utilizing switchable wettability and reasonable alternating wetting, biomimetic surfaces for manipulating underwater oil droplets were successfully fabricated. These surfaces have cross-contamination resistance, stable wettability, and rewritability, which expand their application field and improve their potential value.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Xifeng Chen, Junjie Luo, Sara Khan, Ruiping Shi, Pengyang Li, Songlin Shi, Jianglei Hu, Fengwei Shi
Summary: In this study, a synthetic medium and active ingredient, phosphomolybdic acid (HPMo) solution, was used to prepare a thick porous wall silicon composite based on HPMo (HPMo@OMS) using the one-step co-condensation method. The composite material exhibited an ordered 2D hexagonal mesoporous structure similar to SBA-15. Compared to HPMo@SBA-15 synthesized in hydrochloric acid solution, HPMo@OMS had a pore wall thickness approximately 2 nm thicker. The catalyst showed high desulfurization activity under mild experimental conditions, achieving a 100% removal rate for sulfur-containing substrate. After 10 desulfurization cycles, the recovered Mo content of HPMo@OMS was only 1.67% by ICP-AES, and the removal rate of DBT remained at 93.5%.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Wei Tong, Kai An, Jiasheng Zhang, Ning Du, Chen Ma, Dangsheng Xiong
Summary: A unique approach for embedding nanoparticles into epoxy resins using hydrogen bonding adsorption has been developed for corrosion prevention. A super-anticorrosive epoxy-based Teflon (MEP-PTFE) coating was successfully created through one-step dip coating, showing promising applications in engineering and public sectors.
Article
Chemistry, Physical
Chenlei Chu, Yinggang Zhao, Pengfei Hao, Cunjing Lv
Summary: By varying the contact angle and geometry of the pillared textures, the wetting transition of individual droplets during condensation has been quantified. Four different wetting state transition modes have been identified and classified in a phase diagram. Simple theories correlating the critical conditions of the wetting state transition to the wettability and geometry of the textures have been constructed and experimentally verified.
Article
Biochemistry & Molecular Biology
Mingyan Xu, Junling Zhang, Xuemei Lu, Fan Liu, Songlin Shi, Xiaoling Deng
Summary: SMARCA4 is highly upregulated in oral squamous cell carcinoma (OSCC) tissues, promoting cell invasion and tumor growth. Mechanistic studies reveal that miR-199a-5p-regulated SMARCA4 promotes tumor cell invasion and metastasis through epithelial-mesenchymal transition (EMT). These findings provide insights into the role of SMARCA4 in OSCC and have important implications for therapy.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Mechanics
Donovan Chaffart, Songlin Shi, Chen Ma, Cunjing Lv, Luis A. Ricardez-Sandoval
Summary: This study develops a semi-empirical force balance-based moving front kinetic Monte Carlo (FB-MFkMC) model to describe droplet spreading. The model captures molecular-level events accurately and efficiently by depicting the state-by-state evolution of a sessile droplet in a stochastic manner. The movement of the droplet triple contact line is depicted using rate expressions derived based on force balance and the viscous damping force is represented using a new semi-empirical expression. The proposed approach is validated using experimental and literature data and provides insights into the behavior of the sessile droplet system.
Article
Multidisciplinary Sciences
Xiaojuan Zhang, Guoyan Wang, Peihao Peng, Yongxiu Zhou, Zhuo Chen, Yu Feng, Yanru Wang, Songlin Shi, Jingji Li
Summary: With economic and social globalization, invasive alien species have become a significant threat to local ecological security. This study analyzed the invasive mechanisms of Ageratina adenophora in southwest China and found that environmental factors played a major role in its invasion, while human activity and climate factors had a lesser influence. The study highlights the importance of optimizing community structure to control and mitigate the invasion of A. adenophora.
Article
Nanoscience & Nanotechnology
Nitong Bu, Lin Wang, Di Zhang, Huimin Xiao, Xiaoman Liu, Xianrui Chen, Jie Pang, Chen Ma, Ruojun Mu
Summary: In this study, a highly hydrophobic and versatile G nanocomposite film was successfully prepared using (3-aminopropyl) triethoxysilane (APS) as an interfacial bridging agent. The film exhibited excellent mechanical properties, water resistance, UV shielding, degradability, antioxidant activity, and antimicrobial properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Biomedical
Yun-Ping Chen, Yue Shao, Peng-Cheng Chen, Kun Li, Jing-Yi Li, Jie Meng, Cheng-Lin Lv, Hao-Yu Liu, Cunjing Lv, Xi-Qiao Feng, Bo Li
Summary: This study reveals that human pluripotent stem cells can self-organize into cysts resembling human epiblast sac on soft elastic substrates without the need for a three-dimensional extracellular matrix overlay. The formation of these cysts is facilitated by the nesting of the soft substrate and requires the activation of the ROCK-Myosin II pathway. These findings highlight the interplay between the mechanical microenvironment and cells in tissue morphogenesis, offering a mechanics-based strategy for generating models of early human embryogenesis using stem cells.
ACTA BIOMATERIALIA
(2023)
Article
Biochemistry & Molecular Biology
Ruojun Mu, Nitong Bu, Yi Yuan, Jie Pang, Chen Ma, Lin Wang
Summary: Constructing biodegradable food packaging with good mechanics, gas barrier and antibacterial properties remains a challenge. This study used a mussel-inspired bio-interface to construct a functional multilayer film. The film demonstrated excellent mechanical properties, UV-shielding, thermal stability, water and oxygen barrier, as well as advanced degradability and antimicrobial functions, which makes it potentially suitable for dry food packaging.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Multidisciplinary
Zhaoyun Sun, Lei Ding, Wei Tong, Chen Ma, Dinglin Yang, Xiang Guan, Yangfan Xiao, Kailun Xu, Qingguo Li, Cunjing Lv
Summary: In this study, a cardiopulmonary bypass tube with good superhydrophobicity and blood repellency was created. The superhydrophobic-treated tube showed a clotting time increase of 157% compared to the bare PVC tube, and a decrease of 32% and 74% in protein and platelet adsorption, respectively. The study also provided an explanation for the anti-platelet adsorption mechanism of superhydrophobic coatings.
MATERIALS & DESIGN
(2023)
Article
Forestry
Mengyue Huang, Guoyan Wang, Xiaojuan Bie, Yunqing Jiang, Xiyue Huang, Jing-Ji Li, Songlin Shi, Tingbin Zhang, Pei-Hao Peng
Summary: This study reveals that seasonal snow cover patterns play a crucial role in determining treeline elevation in the eastern Himalayas. The research finds that treeline elevation increases with summer temperature and snowline elevation, but decreases with snow cover days and spring temperature. Spring snowline elevation and seasonal snow cover days have the greatest impact on treeline elevation, suggesting that the effects of temperature and moisture on treeline elevation are strongly mediated by seasonal snow cover.
Article
Physics, Fluids & Plasmas
Kun Li, Cunjing Lv, Xi-Qiao Feng
Summary: The morphology and motion behavior of a cell are influenced by external stimuli and geometric confinement. The adhesion of vesicles is significantly influenced by the mean curvature of the substrate. The configuration of vesicles adhered to curved substrates is obtained theoretically and numerically simulated, and the role of curvature in adhesion and potential biological significances are discussed.
Article
Thermodynamics
Chen Ma, Zhiping Yuan, Wei Tong, Lin Wang, Cunjing Lv, Quanshui Zheng
Summary: The coalescence-induced jumping detachment of droplets on superhydrophobic surfaces is a promising strategy in phase-change related applications. This study presents a unified model for accurately predicting droplet jumping and investigates the coupling physics involved in this process. The model is validated and applied to improve the design of droplet-jumping-based vapor chambers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)