Article
Thermodynamics
Ellyn Harges, Lorenzo Cremaschi, Burak Adanur
Summary: This study found that hydrophilic surfaces had larger average droplet sizes and wider size distributions due to a coalescence phenomenon. Freezing times were controlled by supersaturation degree and temperature difference for all surface wettability types. Testing without cleaning the surfaces led to a film deposition that delayed freezing and impacted droplet shape.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Lei Ouyang, Nan Wang, Joseph Irudayaraj, Tetsuro Majima
Summary: This article summarizes the current understanding of the interaction between viruses and surfaces from a chemistry perspective. It covers the attachment of viruses to surfaces, the effects of biological, physical, and chemical parameters on virus survival and transfer, and the disinfection strategies for viruses. It also introduces the design principles for virus-repelling surface chemistry.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2023)
Article
Energy & Fuels
Shiquan Shen, Huan Liu, Yi Liu, Xi Liu, Houzheng Hu, Zhiming Hu, Tianyou Wang
Summary: Emulsion fuel technology is widely recognized as a potential alternative fuel to improve engine fuel efficiency and reduce pollutant emissions without modifying the engine. Micro-explosion in fuel spray has been identified as the key factor in enhancing fuel combustion efficiency and reducing harmful emissions. However, there have been limited studies on the micro-dynamic processes inside emulsion droplets before micro-explosion occurs during heating. Understanding these micro-dynamic processes is crucial for explaining micro-explosion.
Article
Chemistry, Physical
Zhiping Yuan, Sihang Gao, ZhiFeng Hu, Liyu Dai, Huimin Hou, Fuqiang Chu, Xiaomin Wu
Summary: The study proposed enhanced jumping methods for droplets on superhydrophobic surfaces, which achieved a nearly theoretical limit of energy transfer efficiency through more orderly flow inside the droplets enabled by a designed structure. The ultimate jumping improved the application of water droplet jumping and enabled other low surface energy fluids to jump.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Liwang Wang, Weihui Yang, Yulong Chang, Bo Yang, Lingyu Xiao, Jiwei Wu, Shijun Huang, Yangfan Li, Hualin Wang, Liang Ma
Summary: In this paper, a micro experimental system and high-speed camera observation system were designed to explore the characteristics of fog droplet adhesion, coalescence and transmission. The study found different structural forms of droplets and their characteristics on fibers, providing a theoretical basis for the optimization and application of gas-liquid fiber coalescence.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Mechanics
Meng Shi, Ratul Das, Sankara Arunachalam, Himanshu Mishra
Summary: By surface engineering and fine-tuning liquid-solid adhesion, it is possible to achieve superhydrophobicity without lowering the Leidenfrost point. Water on superhydrophobic surfaces comprising doubly reentrant pillars (DRPs) can exceed that on hydrophilic and even superhydrophilic surfaces in terms of the Leidenfrost point.
Article
Thermodynamics
Jianqiang Hou, Jianying Gong, Xin Wu
Summary: A numerical model was established to investigate the freezing behavior of ellipsoidal water droplets on cold surfaces. The study focused on the spreading behavior, impact force evolution, and heat transfer behavior. The results showed that reducing the aspect ratio of the droplets reduced the contact time on superhydrophobic surfaces, facilitating rebound. Increasing the aspect ratio increased the spreading range, especially on hydrophilic surfaces. The impact force evolution on superhydrophobic surfaces exhibited a double-peak feature, with the first peak decreasing and the second peak increasing as the aspect ratio increased. The heat transfer between droplets and the cold surface was greater for higher aspect ratios, especially on more hydrophobic surfaces. Increasing aspect ratio seemed to be a good choice for rapid freezing applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Physics, Multidisciplinary
Mathieu Lizee, Alice Marcotte, Baptiste Coquinot, Nikita Kavokine, Karen Sobnath, Clement Barraud, Ankit Bhardwaj, Boya Radha, Antoine Nigues, Lyderic Bocquet, Alessandro Siria
Summary: Solid-liquid interfaces exhibit emerging phenomena at nanometer scales, which are crucial for their technological applications. However, the coupling between liquid flows and the solid's electronic degrees of freedom has been largely overlooked. In this study, we investigate the molecular mechanisms of interfacial liquid-electron coupling and reveal flow-induced current generation at the nanoscale. Our findings demonstrate a momentum transfer mechanism between fluid molecules and graphene charge carriers, mediated by the solid's phonon excitations, and open up new possibilities for controlling nanoscale liquid flows through the solid walls' electronic degrees of freedom.
Article
Chemistry, Physical
Rui Li, Zhixiang Chen, Yi Lu, Hao Wu, Qi Jiang, Guanchen Jiang
Summary: This study experimentally investigated the oblique impact behavior of water droplets on a surface with a liquid-like perfluoropolyether coating. The research found that the impinging water droplets exhibited inelastic collision and continuous sliding on the liquid-like surface. It was suggested that the competition between inertial and capillary forces dominated the spreading process on the liquid-like surface.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Thermodynamics
Dong Niu, Hongtao Gao, Yuying Yan
Summary: This study investigated dropwise condensation on different nanostructured surfaces using molecular dynamics simulation, revealing the significant influence of surface characteristics on droplet growth and state transition. The results showed three typical droplet state transition modes corresponding to the heat flux, providing insights into the mechanisms of dropwise condensation.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Jing Zhao, Zehao Pan, Deborah Snyder, Howard A. Stone, Todd Emrick
Summary: Functional polymer surfactants play a crucial role in the construction and triggered collapse of droplet-based fibers, allowing for reagent compartmentalization. These macroscopic supracolloidal structures offer a strategy to impart chemical reactivity to soft materials structures on demand, benefiting from the interfacial chemistry of the system. The stable cross-linked versions of these fibers direct interdroplet passage of encapsulants along the fiber length, showing potential applications in controlled drug release systems.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Huimin Hou, Xiaomin Wu, Zhifeng Hu, Sihang Gao, Liyu Dai, Zhiping Yuan
Summary: The phenomenon of droplet jumping induced by coalescence has potential applications in water collection, self-cleaning, and thermal management of electronic devices. A numerical simulation was conducted to examine the similarities and differences in droplet jumping on superhydrophobic surfaces with uniform and non-uniform micropillars, as well as the effect of micropillar nonuniformity. The results showed that non-uniform distribution of micropillars affected the shrinkage of the liquid bridge, droplet morphology, and high-pressure region distribution, resulting in changes in droplet jumping velocity.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Thermodynamics
Zhigang Xu, Haicheng Qi, Tianyou Wang, Zhizhao Che
Summary: This study explores the delayed coalescence of hot droplets on a liquid film, which is mediated by the intervening gas layer. The thickness of the gas layer increases with the droplet temperature, explaining the thermal delay of coalescence. The temperature gradient at the bottom of the droplet induces Marangoni flow, which delays the drainage of the intervening gas layer. The residence time of the droplet decreases as the Weber number increases due to the thinner gas layer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
Asif Raiyan, Behrouz Mohammadian, Hossein Sojoudi
Summary: This study investigates the wettability of superhydrophobic nanoporous surfaces in condensation and freezing environments, finding that carbon nanotube microstructured pillars with favorable topological configuration exhibit excellent anti-condensation and anti-icing properties.
Article
Engineering, Chemical
Changyang Li, Xiaohan Liu, Peng Wang, Dun Zhang
Summary: In this study, the influence of composite structured superhydrophobic surfaces on droplet self-jumping behavior was investigated. The results showed that the nano-scale composite structured SHS exhibited better droplet self-jumping performance and corrosion protection performance.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Thermodynamics
Donghyun Seo, Seungtae Oh, Byungyun Moon, Hyunsik Kim, Juhyok Kim, Choongyeop Lee, Youngsuk Nam
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Electrochemistry
Jeonghoon Han, Changwoo Bae, Songhwa Chae, Dukhyun Choi, Sangmin Lee, Youngsuk Nam, Choongyeop Lee
ELECTROCHIMICA ACTA
(2019)
Article
Nanoscience & Nanotechnology
Donghyun Seo, Jaehwan Shim, Byungyun Moon, Kyungjun Lee, Jooyoung Lee, Choongyeop Lee, Youngsuk Nam
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Multidisciplinary Sciences
Donghyun Seo, Jaehwan Shim, Choongyeop Lee, Youngsuk Nam
SCIENTIFIC REPORTS
(2020)
Article
Mechanics
Gregoire Martouzet, Choongyeop Lee, Christophe Pirat, Christophe Ybert, Anne-Laure Biance
JOURNAL OF FLUID MECHANICS
(2020)
Article
Biotechnology & Applied Microbiology
Kyounghwan Song, Jaehwan Shim, Jung-Yeul Jung, Choongyeop Lee, Youngsuk Nam
Article
Chemistry, Multidisciplinary
Young Su Ko, Hyeon Jeong Kim, Chi Wook Ha, Choongyeop Lee
Article
Thermodynamics
Young Su Ko, Jeonghwan Kim, Seunggeol Ryu, Jeonghoon Han, Youngsuk Nam, Choongyeop Lee
Summary: In this study, the influence of pancake-like early bouncing on the change of surface temperature during drop impact was experimentally investigated using metallic superhydrophobic surfaces. The results showed that reducing contact time can reduce heat transfer, but the inevitable increase in contact area caused by early bouncing counterbalances the effect of contact time reduction.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
Hyungyu Sung, Hongseok Choi, Chiwook Ha, Choongyeop Lee, Hyungmin Park
Summary: The combination of bubble injection and superhydrophobic surfaces provides a solution to the challenges of air flow and depletion on the surface. By introducing bubbles over superhydrophobic surfaces with longitudinal grooves, the plastron can be replenished with a small amount of air even after the surface is fully wetted. The effective plastron thickness is related to surface light intensity, which serves as a criterion for successful replenishment.
Article
Mechanics
Ikroh Yoon, Chiwook Ha, Choongyeop Lee, Seungwon Shin
Summary: This study experimentally and numerically investigates the rebounding behavior of a droplet on a spherical particle and the impact of surface curvature. The findings suggest that rebounding can be promoted on smaller particles. The physical mechanism behind this promotion is the reduced energy dissipation on smaller particles during collision, which allows for larger liquid-gas interfacial deformation and promotes rebound.
Article
Engineering, Chemical
Jeonghoon Han, Young-Su Ko, Youngsuk Nam, Choongyeop Lee
Summary: Recently, the thermal condition within the membrane has been explored as a means to enhance power generation in membrane-based energy harvesting from salinity difference. In this work, we experimentally demonstrate that even a negligibly small thermal gradient within a nanoporous membrane can significantly enhance osmotic power generation. Moreover, we propose that the direction of the imposed temperature difference can lead to up to 5.3 times power enhancement by influencing the effective ion concentration across the membrane.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Mechanics
Mi Song Nam, Ha Truong Sang, Hyoung Gwon Choi, Ki Woon Kim, Choongyeop Lee, Yun Jung Heo
Summary: Precise and controlled drug delivery is crucial in continuous infusion systems. This study presents a novel approach to passively control a flow rate even under fluctuating pressure by utilizing a flow regulator consisting of microchannels and a flexible membrane. The concept successfully maintains a steady output flow rate within a target pressure range, offering a promising solution for achieving stable drug delivery.
Article
Physics, Fluids & Plasmas
Christophe Pirat, Cecile Cottin-Bizonne, Choongyeop Lee, Stella M. M. Ramos, Olivier Pierre-Louis
Summary: This study reports a well-controlled experiment of drop breakup, where bubble growth is triggered by a decrease in ambient pressure. The researchers found a transition from top-breakup to triple-line breakup depending on the initial contact angle of the drop. A minimal model based on inertial dynamics and constant bubble pressure is proposed, which accurately captures the growth of the bubble and the distinction between top or triple-line breakup.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Chemistry, Physical
Changwoo Bae, Seungtae Oh, Jeonghoon Han, Youngsuk Nam, Choongyeop Lee
Article
Physics, Fluids & Plasmas
Jeonghoon Han, Wonjung Kim, Changwoo Bae, Dongwook Lee, Seungwon Shin, Youngsuk Nam, Choongyeop Lee
Article
Chemistry, Physical
Yiping Yin, Zhe Wang, Hua Zou
Summary: This study presents a novel method for preparing dimpled polymer-silica nanocomposite particles using interfacial swelling-based seeded polymerization. The optimized conditions allow for a relatively high percentage of dimpled particles to be achieved.
Article
Chemistry, Physical
Brenden D. Hoehn, Elizabeth A. Kellstedt, Marc A. Hillmyer
Summary: Porous materials with nanometer-scale pores have important applications as nanoporous membranes. In this study, ABA triblock copolymers were used as precursors to produce nanoporous polymeric membranes (NPMs) in thin film form by degrading the end blocks. Polycyclooctene (PCOE) NPMs with tunable pore sizes were successfully prepared using solvent casting technique. Oxygen plasma etching was employed to improve the surface porosity and hydrophilicity of the membranes. This study provides a straightforward method to produce tough NPMs with high porosity and hydrophilic surface properties.
Article
Chemistry, Physical
Vladislav S. Petrovskii, Stepan I. Zholudev, Igor I. Potemkin
Summary: This article investigates the behavior of linear and ring polypeptide chains in aqueous solution and explores the properties of the complexes formed by these chains with oppositely charged surfactants. The results demonstrate that the complexes of linear supercharged unfolded polypeptides and the corresponding surfactants exhibit impressive adhesive properties.
Article
Chemistry, Physical
Merve Cevik, Serkan Dikici
Summary: Cardiovascular diseases are a leading cause of death globally, and vascular grafts are a promising treatment option. This study focuses on tissue-engineered vascular grafts (TEVGs) using decellularized parsley stems as a potential biomaterial. The decellularized parsley stems showed suitable properties for TEVGs, providing a suitable environment for human endothelial cells to form a pseudo endothelium. This study showcases the potential of using parsley stems for TEVGs.
Article
Chemistry, Physical
Gustavo A. Vasquez-Montoya, Tadej Emersic, Noe Atzin, Antonio Tavera-Vazquez, Ali Mozaffari, Rui Zhang, Orlando Guzman, Alexey Snezhko, Paul F. Nealey, Juan J. de Pablo
Summary: The optical properties of liquid crystals are typically controlled by electric fields. In this study, we investigate the effects of microfluidic flows and acoustic fields on the molecular orientation and optical response of nematic liquid crystals. We identify several previously unknown structures and explain them through calculations and simulations. These findings hold promise for the development of new systems combining sound, flow, and confinement.
Article
Chemistry, Physical
Xinjun Wu, Xin Guan, Shushu Chen, Jiangpeng Jia, Chongyi Chen, Jiawei Zhang, Chuanzhuang Zhao
Summary: This research presents a novel shape memory hydrogel with a remodelable permanent shape and programmable cold-induced shape recovery behavior. The hydrogel is prepared using specific treatment methods to achieve shape fixation by heating and shape recovery by cooling. Additionally, deformable devices can be obtained by assembling hydrogel blocks with different concentrations.
Article
Chemistry, Physical
Rebecca Hengsbach, Gerhard Fink, Ulrich Simon
Summary: This study examines the properties of DNA functionalized pNipmam microgels and pure pNipmam microgels at different concentrations of sodium chloride and in PBS solutions using temperature dependent H-1-NMR measurements. The results show that DNA modification affects the volume phase transition temperature and the addition of salt and PBS further enhances this effect.
Article
Chemistry, Physical
Ningyi Li, Junhong Li, Lijingting Qing, Shicheng Ma, Yao Li, Baohui Li
Summary: This paper investigates the self-assembly behavior of colloids with competing interactions under spherical confinement and finds that different ordered structures can be formed under different sized spherical confinements. Moreover, more perforated structures are formed in smaller spheres.