Article
Crystallography
Chengzhi Huang, Yugang Zhao, Tian Gu
Summary: This study experimentally investigated the dynamics of condensation frosting, focusing on the growth of ice dendrites and the properties of fully-developed frost layers. The results showed that surface orientations have a significant impact on the growth rate and spatial variations of ice dendrites. These findings are valuable for optimizing defrosting technologies and heat exchanger design.
Article
Engineering, Chemical
C. W. Extrand
Summary: In this study, the spreading of a small sessile drop on a smooth, flat surface is analyzed and a comprehensive energy balance model is developed. It is found that the wettability of the solid surface has a significant impact on the net change in various energies during the spreading process. The spreading of the drop is driven in different ways on surfaces with different wettability. Overall, the model suggests that the spreading of the drop is an exothermic process.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2023)
Review
Chemistry, Physical
Ilia V. Roisman, Cameron Tropea
Summary: Forced or spontaneous wetting of a solid surface in an isothermal case is determined by outer flow and substrate wetting properties, which are influenced by wettability and morphology. Wetting and subsequent or simultaneous icing of surfaces are also affected by microscopic processes associated with phase change near the contact angle and in the outer region.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2021)
Review
Chemistry, Physical
Nathan Blanken, Muhammad Saeed Saleem, Marie-Jean Thoraval, Carlo Antonini
Summary: Researchers are increasingly focusing on the interaction of droplets with solid surfaces, paying more attention to 'complex' surfaces and droplets. A recent trend in research is the investigation of compound drop impact, which consists of two or more distinct continuous phases sharing common interfaces, surrounded by a third phase. This review addresses the fundamental aspects of compound drop impact and discusses challenges in experimental testing and numerical simulation of multiphase fluid systems.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Junmiao Shi, Qian Wang, Fuqiang Tian, Lixia Zhang, Xiancheng Zhang
Summary: The study investigated the wetting and spreading behaviors of molten Ag-Zr filler on ZrC-SiC ceramic surface, showing that the wetting process was controlled by interfacial reaction due to Zr activity difference, leading to the promotion of wetting and spreading on the ZrC-SiC surface.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Abrar Ahmed, Raymond Sanedrin, Thomas Willers, Prashant R. Waghmare
Summary: The study suggests that drop deposition techniques can impact contact angle measurements, mainly due to drop pinch-off and dynamic wetting pressure. Experimental comparison of parameters in pendant drop and liquid-needle techniques reveals a pronounced drop volume dependency for the former but not the latter. This highlights the importance of well-controlled drop deposition to ensure accurate contact angle data independent of deposition effects.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Review
Chemistry, Physical
Qiaoli Lin, Kaibin Xie, Ran Sui, Dekui Mu, Rui Cao, Jinghuan Chang, Feng Qiu
Summary: This study reviews the current status of wetting dynamic models, highlighting the challenges in understanding high-temperature interface kinetic processes for composite materials. Common analysis errors in metal-ceramic and metal-metal systems are identified in describing wetting dynamics.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Thermodynamics
A. Dourari, R. Lankri, S. Chikh, S. Khalfallah, L. Tadrist
Summary: An experimental study investigates the evaporation phenomenon of a highly volatile methanol drop. The study uses optical techniques to observe the drop's shape evolution and determine its geometric parameters. The results show three distinct stages of evaporation: fast evaporation, formation of a thin liquid film and subsequent retraction of the drop, and slow evaporation accompanied by changes in contact angle and wetting area.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
Yigui Lao, Guangqiang Li, Yunming Gao, Cheng Yuan
Summary: The interactions between molten iron and three different magnesia aggregates were studied, and it was found that the oxygen partial pressures had minimal effect on the interaction mechanism. No. 2 substrate had the largest interacted area with molten iron, while No. 1 substrate exhibited better resistance to FeO corrosion. The larger bulk density and grain size of No. 3 substrate could reduce the FeO penetration.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Yigui Lao, Guangqiang Li, Yunming Gao, Cheng Yuan
Summary: The wetting and corrosion characteristics of refractory by molten slag are important for understanding the corrosion mechanism and slag resistance. The study found that microporous magnesia aggregate has better slag resistance compared to fused magnesia. Slags with higher CaO/SiO2 value and MgO content have a greater ability to slow down the dissolution of refractory substrate. Surface tension and viscosity have a more significant impact on slag penetration than contact angle.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Bekir Sami Yilbas, Abba Abdulhamid Abubakar, Ghassan Hassan, Hussain Al-Qahtani, Abdullah Al-Sharafi, Mahmood Kassas, Abdullah A. Alzahran, Anwaruddin Siddiqui Mohammed
Summary: Manipulating ferro-liquid droplets on hydrophobic surfaces is important for various applications. This study investigates the magnetic influence of ferro-liquid droplets on hydrophobic surfaces and explores the mechanisms of newborn droplet formation under magnetic force. The mode of droplet motion changes from sliding to rolling as the magnetic Bond number increases, and the translational velocity of the droplet under rolling mode increases with higher ferro-particle concentration.
Article
Chemistry, Physical
Mohammad Bagher Asadi, Damon G. K. Aboud, Michael J. Wood, Gianluca Zeppetelli, Anne-Marie Kietzig
Summary: This article introduces a novel method for measuring the contact angle of a drop, which utilizes a smoothing splines approach to eliminate image noise, identify the contact point, and calculate the contact angle. The accuracy of this technique is demonstrated through synthetic drop images and real surface tests, showing higher accuracy than traditional methods.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Thermodynamics
Sumaiya Farzana, Ryan Baily, Prashant R. Waghmare
Summary: The study investigates the initial spreading phenomena of oil droplets on a partially wettable surface under various surrounding pressures, revealing that the spreading process is fast and the spreading radius evolves according to a power law, with the spreading exponent decreasing with increasing pressure.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2021)
Article
Chemistry, Physical
Wenwu Ding, Carlos Alberto Dorao, Maria Fernandino
Summary: This study investigates the phenomenon of droplet impact on superhydrophobic structured surfaces, where droplets can either bounce off or pin on the surface depending on the impact velocity. The researchers propose that multi-layer re-entrant like roughness can enhance the anti-wetting properties of the surface, even for low surface tension droplets. Experimental results demonstrate that conical microstructures with lateral roughness mimicking tree-branches prevent droplets from pinning on the surface at higher impact velocities. This study contributes to the understanding of liquid interaction mechanisms during the impact process and provides insights for surface design considerations.
JOURNAL OF COLLOID AND INTERFACE 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
Karthik Nuthalapati, Yu-Jane Sheng, Heng-Kwong Tsao
Summary: The wetting behavior of binary mixtures containing both partial and total wetting liquids on substrates is studied. The contact angle of the binary liquid on different solid surfaces varies with its composition. Four different regimes are identified in the contact angle-composition plot for self-propelled droplets, while the contact angle monotonously increases with the concentration of the partial wetting liquid for non self-propelled droplets. The leak-out phenomenon in the plateau regime, where the droplet is surrounded by the precursor film, is examined by observing the encounter of two miscible droplets using optical microscopy.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Physical
Hsin-Yu Chang, Heng-Kwong Tsao, Yu -Jane Sheng
Summary: Concentrated emulsions with volume fractions exceeding the critical value display solid-like behavior and have diverse applications. However, it is challenging to study the mechanical properties of monodisperse concentrated emulsions due to thermodynamic instability and droplet coalescence. A mesoscopic simulation method is employed to investigate the effects of volume fraction, droplet diameter, and interfacial tension on Young's modulus and bulk modulus.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Polymer Science
Ming-Chang Hsieh, Yu-Hao Tsao, Yu-Jane Sheng, Heng-Kwong Tsao
Summary: This work investigates the evolution of radial size distributions of linear polymers during stretching processes through dissipative particle dynamics simulations. In uniaxial extensional flow, it is observed that the mean radius of gyration and standard deviation remain unchanged until the onset of strain hardening, corresponding to linear viscoelasticity. Both parameters rise rapidly in the non-linear regime, and bimodal size distribution can emerge. Moreover, the onset of strain hardening is found to be insensitive to the Hencky strain and chain length.
Article
Chemistry, Physical
Karthik Nuthalapati, Yu-Jane Sheng, Heng-Kwong Tsao
Summary: Manipulating and guiding droplet movement on a substrate using vapor-mediated actuation is a novel approach for microfluidic devices. This study demonstrates the self-propulsion of droplets such as N,N-dimethylacetamide and N-methylformamide on glass through evaporation-driven mechanisms. By adding Silwet surfactant, the wetting behavior of the liquids changes and two-component droplets are formed on the glass. The random walk behavior of the droplets can be directed by hydrophobic runways on the substrate, and the long-range transport of the droplets is observed. The effect of Silwet concentration on self-propelled velocity is examined, and the evaporation-driven mechanism is investigated in open and closed environments.
SURFACES AND INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Trung Hieu Vo, Phuc Khanh Lam, Yu-Jane Sheng, Heng-Kwong Tsao
Summary: This research developed a simple two-step mixing approach to prepare a 3D printing ink using green, low-cost, and low-toxicity materials. The ink showed desired rheological properties and significantly enhanced the stretchability of eutectogels. The 3D-printed structure exhibited negative Poisson's ratio, high stretchability, high sensitivity, good moisture resistance, and sufficient transparency, making it suitable for detecting human motion.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Chemical
Hsin-Wei Hu, Heng-Kwong Tsao, Yu-Jane Sheng
Summary: In this study, dissipative particle dynamics simulations were used to investigate the solidification dynamics of polymer solutions for membrane formation. The shrinkage of the symmetric film of polymer solution was monitored, and the concentration profiles of polymer, solvent, and nonsolvent were analyzed. The demixing process associated with liquid-solid separation was found to be caused by the extraction of solvent and concentration of polymers. Valuable insights into directional solidification and spontaneous stratification of the membrane, driven by solvent loss and oversaturation, were provided.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Physical
Shu-Yu Chang, Yu-Jane Sheng, Heng-Kwong Tsao
Summary: The supercooled liquid state of a deep eutectic solvent (DES) composed of a mixture of choline chloride and citric acid monohydrate (CA) was studied. The viscosity of the supercooled DESs, which increased with higher CA content, could be described by an Arrhenius equation. Surface tensions were considerably high, comparable to that of water, and slightly decreased with higher CA concentration. The wetting behavior of supercooled DESs on glass was characterized by an unusually slow spreading process, and the equilibrium contact angle increased with higher CA content.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Guan-Lin Chen, Guan-Yu He, Yu-Jane Sheng, Heng-Kwong Tsao
Summary: Investigation of imbibition dynamics in a U-groove connected to a sudden enlargement and complicated by the presence of CF filaments is conducted using many-body dissipative particle dynamics. Four different flow types are identified depending on the contact angle θ(y), the critical angle θ(f), and the critical angle θ(c). The flow dynamics is greatly influenced by the length of the large U-groove (l(e)).
Editorial Material
Chemistry, Multidisciplinary
Hendrik Heinz, Yogesh M. Joshi, Hongbo Zeng, Heng-Kwong Tsao, Sissi J. A. de Beer, Erin Koos, Atsushi Takahara, Gilbert C. Walker