Article
Engineering, Mechanical
Max Spencer, Xiao Chen
Summary: This study presents an experimental investigation of cracking behavior in thick carbon/glass fiber hybrid composite laminates with manufacturing-induced ply wrinkles. The study shows that despite their higher extension stiffness, the hybrid laminates first crack at a lower stress level than the pure glass ones. A novel image difference analysis method is proposed to accurately and efficiently pinpoint stiffness drops during fatigue loading.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Physics, Multidisciplinary
Tianzi Bai, Rogerio Manica, Bo Liu, Evert Klaseboer, Zhenghe Xu, Qingxia Liu
Summary: This study investigates the thin film drainage between a viscous oil drop and a mica surface, highlighting the effects of Laplace pressure and viscous normal stress. The research indicates that the drop viscosity plays a significant role in the drainage process, and proposes a mathematical model relating drop size and capillary numbers. These findings have implications for industrial systems involving highly viscous liquids.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Alexandre Poirier, Antonio Stocco, Romain Kapel, Martin In, Laurence Ramos, Amelie Banc
Summary: The study investigated the adsorption process of sunflower protein extract at two air-water and oil-water interfaces, revealing a three-step mechanism. Initially, a diffusion-limited adsorption of proteins at interfaces occurs, followed by the formation of a three-dimensional saturated monolayer of proteins, and finally a thick layer expanding in the aqueous phase. The study also found that the adsorption mechanisms of proteins exhibit significant divergences at longer adsorption times.
Article
Engineering, Environmental
Yongjie Liu, Thomas Horseman, Zhangxin Wang, Hassan A. Arafat, Huabing Yin, Shihong Lin, Tao He
Summary: The negative pressure direct contact membrane distillation (NP-DCMD) can effectively reduce mineral scaling and significantly enhance vapor flux by applying negative gauge pressure on the feed stream, achieving prolonged resistance to CaSO4 scaling and up to 62% enhancement in vapor flux.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Carolina van Baalen, Jacopo Vialetto, Lucio Isa
Summary: This study explores the control of crystallization of colloidal particles at oil-water interfaces using oil-soluble electrolytes. The results show that the repulsion among particles can be continuously tuned by introducing nanomolar amounts of an organic salt into the oil.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ksenia Babina, Maria Polyakova, Inna Sokhova, Vladlena Doroshina, Marianna Arakelyan, Alexandr Zaytsev, Nina Novozhilova
Summary: The study found that ultrasonic scaling and air-powder polishing techniques have an impact on the roughness of enamel, nanocomposites, and composite/enamel and composite/cementum interfaces. Air-powder polishing resulted in a more significant increase in surface roughness of composite resin and restoration margins compared to ultrasonic scaling.
Article
Chemistry, Physical
Jotam Bergfreund, Michael Diener, Thomas Geue, Natalie Nussbaum, Nico Kummer, Pascal Bertsch, Gustav Nystrom, Peter Fischer
Summary: The polarity of the oil phase has a significant impact on the formation of globular protein networks at fluid interfaces, including the degree of protein unfolding, protein location, and network strength.
Article
Chemistry, Physical
David P. Rivas, Nathan D. Hedgecock, Kathleen J. Stebe, Robert L. Leheny
Summary: The experimental study on biofilm formation by Pseudomonas Aeruginosa PA14 using particle tracking, active microrheology, and differential dynamic microscopy revealed a transition of the oil-water interface dynamics from an active fluid to an active viscoelastic system as the biofilm ages. The microrheology measurements showed that the biofilm behaves as a viscoelastic solid at late ages, while bacteria motility at the interface evolves from diffusive to quasi-localized motion. Additionally, the mobility of colloidal spheres at the interface decreases significantly with increasing age, showing an anomalous size dependence likely influenced by the biofilm rheology or bacteria activity.
Article
Chemistry, Physical
Qipeng Ma, Weiyao Zhu, Wengang Bu, Zhiyong Song, Hua Li, Yajing Liu
Summary: This study compares the differences in residual oil distribution and oil displacement mechanisms between capillary force-driven and gravity-driven systems through core and pore-scale experiments. The results show significant differences in residual oil treatment and oil displacement between capillary force-driven and gravity-driven systems, and the micro mechanisms behind these differences are revealed through the study of contact angles and solid-liquid interfacial forces.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Timothy T. Duignan
Summary: This study investigates the mechanism of ions preventing bubble coalescence in water, finding that the Gibbs-Marangoni pressure explains this phenomenon, and the distribution of ions and surface potential affect this pressure, thereby impacting the ability of bubble coalescence.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Environmental
Peipei Wang, Pablo R. Brito-Parada
Summary: Experimental research on the dynamics of bubble collision with air-liquid interfaces reveals that particle coverage affects the approach velocity of bubbles. Particle motion and bubble shape pulsation contribute to the dissipation of kinetic energy in approaching bubbles, and a damped oscillation model is proposed to describe the interaction between bubbles and interfaces.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Food Science & Technology
Jing Yang, Dengfeng Peng, Weiping Jin, Fang Geng, Chen Cheng, Lei Wang, Haihui Zhang, Yuqing Duan, Qianchun Deng
Summary: The application of plant proteins in food systems is hindered by their poor foaming or emulsifying properties and low digestibility. However, physical fields and pH shifting can synergistically improve their structure and interfacial layer, thereby enhancing their foaming or emulsifying properties. These improvements involve depolymerizing aggregated plant proteins, adsorbing particles with suitable surface properties to the interfacial layer and generating a tightly packed stiff layer, and exposing more cutting sites for digestive enzymes.
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
(2023)
Article
Chemistry, Physical
Uvinduni I. Premadasa, Ying-Zhong Ma, Robert L. Sacci, Vera Bocharova, Nikki A. Thiele, Benjamin Doughty
Summary: The study found that ligands with branched hydrophobic tails form stable interfaces at lower concentrations compared to those with linear alkyl tails. The lack of an oil phase and associated solvation leads to markedly different interfacial properties. Therefore, interactions in both the polar and nonpolar phases are essential in understanding self-assembly at the oil/liquid interface.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Alesya Mikhailovskaya, Emmanouil Chatzigiannakis, Damian Renggli, Jan Vermant, Cecile Monteux
Summary: This study compares the macroscopic drainage and collapse behavior of aqueous foams stabilized by different stabilizers and investigates the dynamic behavior of individual thin films. The comparison provides significant insight into the effect of surface stresses and intermolecular forces on foam stability. The study observes distinct foam lifetime regimes and reveals unique coalescence behavior in PVA foams.
Article
Chemistry, Physical
Jana L. Butman, Regan J. Thomson, Franz M. Geiger
Summary: The oscillators of C-H and O-H on the surfaces of thin films of human derived skin oil and squalene are studied under ambient conditions, revealing a loss of C-H oscillators and an increase in hydrophobicity of the films after exposure to ozone. The findings suggest the significance of this chemical reaction in indoor environments.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Physics, Applied
E. Ruiz-Gutierrez, P. J. Baker, A. M. J. Edwards, M. Newton, I. C. Sage, R. Ledesma-Aguilar, G. McHale, C. Brown
Summary: This study demonstrates the formation of thin, rectangular shaped films of electrically insulating liquid on curved and flexible liquid repellent substrates using dielectrophoresis forces. The experimental threshold voltage for film formation is found to have a monotonic dependence on the substrate curvature. By considering the balance of stresses acting on the films, the researchers develop an analytical theoretical expression that is in excellent quantitative agreement with the experimental measurements. The results and the demonstrated programmable wettability on curved and flexible substrates provide foundations for various applications such as imaging, displays, and biochemical analysis.
APPLIED PHYSICS LETTERS
(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.
Article
Chemistry, Analytical
Martin Bencsik, Adam McVeigh, Costas Tsakonas, Tarun Kumar, Luke Chamberlain, Michael I. Newton
Summary: NDIR detectors are widely used to measure atmospheric CO2, but their application in honeybee colony health assessment is limited. This study presents a microcontroller-based system that collects data from NDIR sensors in honeybee colonies. The data suggests that colony size can be estimated from changes in CO2 levels, but no correlation with humidity was observed. The study also reveals a decreasing trend of CO2 levels over weeks as colonies die.
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.
Article
Physics, Fluids & Plasmas
Joseph R. L. Cousins, Akhshay S. Bhadwal, Lindsey T. Corson, Brian R. Duffy, Ian C. Sage, Carl V. Brown, Nigel J. Mottram, Stephen K. Wilson
Summary: This study theoretically investigates the weak anchoring effects in a thin two-dimensional pinned static ridge of nematic liquid crystal on a flat solid substrate in a passive gas atmosphere. Numerical investigations reveal five qualitatively different types of energetically preferred solutions, which are supported by experimental results. The study provides insights into the behavior of the director within the ridge and the breaking of anchoring near the contact lines.