Article
Chemistry, Multidisciplinary
Xifan Fu, Qinpeng Zhu, Denghui Liu, Binghan Liu, Lintao Kuang, Yanhui Feng, Fuqiang Chu, Zhi Huang
Summary: A study on moisture condensation on hybrid superhydrophobic-hydrophilic surfaces revealed the significant impact of wettability difference and microstructure size on condensation efficiency, leading to a 90% enhancement in condensation rate. Detailed analysis of the condensation process provided insights into the enhanced condensation mechanism, proposing effective methods for controlling and optimizing moisture condensation.
Article
Chemistry, Multidisciplinary
Hamed Esmaeilzadeh, Keqin Zheng, Carol Barry, Joey Mead, Majid Charmchi, Hongwei Sun
Summary: This study evaluated the performance of hydrophobic surfaces under external hydrostatic pressures using an acoustic wave device (QCM), finding that the wetting state of hydrophobic surfaces transitions at a critical hydrostatic pressure and the drag reduction induced by the surfaces decreases with increasing pressure.
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
Henry Rodriguez-Broadbent, Darren G. Crowdy
Summary: At high surface Peclet numbers, the presence of surfactants can lead to surface immobilization, but a different mechanism is proposed for longitudinal shear flow along a unidirectional trench at high Marangoni numbers, where the meniscus becomes a constant-shear-stress surface due to contamination by surfactant. Experimental observations support the presence of recirculating interfacial flows on the meniscus. By calculating slip lengths, it is shown that the effective immobilization of the surfaces with vortical flows on the meniscus highlights the caution needed when comparing theory and experiments based on effective slip properties alone.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Engineering, Mechanical
Mengzhuo Zhang, Haibao Hu, Jun Wen, Liuzhen Ren, Luo Xie
Summary: Experiments were conducted to control the morphology of the air-water interface on superhydrophobic surfaces (SHS) by regulating the internal pressure of the air film. Different microstructures were achieved on SHS by spraying fluorinated silica particles with varying diameters on perforated substrates. The regulation of internal pressure was done through micro-holes on the substrate, allowing the plastron to sustain under hydrostatic pressure. The results showed that the shape of the meniscus changed from concave to flat as the air film internal pressure increased.
EXPERIMENTS IN FLUIDS
(2023)
Article
Chemistry, Physical
Stephan Milles, Johannes Dahms, Marcos Soldera, Andres F. Lasagni
Summary: This study explored the fabrication methods of laser-microtextured surfaces and their impact on the characteristics of aluminum. Experimental analysis revealed the influence of different laser processing parameters on the surface topography. The results demonstrated that laser-textured surfaces exhibit excellent superhydrophobic properties and provide protection for smaller features under tribological conditions.
Article
Chemistry, Physical
Wanting Rong, Haifeng Zhang, Zhigang Mao, Liang Chen, Xiaowei Liu
Summary: The study introduces an asymmetric anisotropic superhydrophobic/hydrophilic surface technology inspired by bionic fish scales to improve drag reduction ratios. ASHS can maintain a stable and improved anisotropic drag reduction effect under high speed impact.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Mechanics
Ning Yu, Zhaohui Ray Li, Alexander McClelland, Francisco Jose del Campo Melchor, Sun Youb Lee, Jae Hwa Lee, Chang-Jin C. J. Kim
Summary: This paper investigates the sustainability of plastrons on superhydrophobic surfaces and their impact on hydrodynamic friction drag reduction in high-speed flows. The study combines existing theories and revises the shear-driven drainage model to account for air diffusion on the superhydrophobic surfaces. Experimental results are in agreement with theoretical estimations, supporting the design of superhydrophobic surfaces for field applications.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Linsheng Zhang, Yasmin A. . Mehanna, Colin R. Crick, Robert J. Poole
Summary: This study systematically evaluated the slip length on an irregularly structured superhydrophobic surface and found that decreasing surface tension leads to a decrease in slip length while increasing viscosity results in an increase in slip length when the surface tension of the liquids is matched to isolate effects.
Article
Mechanics
Tongtong Tao, Zhaochang Wang, Jiawei Ji, Yuhang Guo, Yongqing Zhu, Xidong Hu, Kun Liu, Yunlong Jiao
Summary: In this study, a deflecting air cavity generation strategy utilizing superhydrophobic area occupancy and impact angle control is reported. The influence of these factors on water entry dynamics and drag reduction characteristics of spheres is investigated through experimental and theoretical analysis. The results show that the deflection displacement of a hemispherically coated sphere reaches its maximum when the impact angle is 90 degrees. The SHB region-modulated sphere exhibits different air cavity morphologies and achieves faster movement with reduced drag.
Article
Chemistry, Physical
Mahmut Camalan, Hsan Arol
Summary: This study investigates the separation efficiency of minerals with superhydrophobic surfaces in water pulsating jigs, and finds that spray-coated particles exhibit drag reduction and promote separation. Selective coating of minerals is effective in slow water pulsation jigging, but excessive coatings hinder separation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Applied
Liangpei Zhang, Zhaohui Huang, Wenfu Cai, Xiao Xue, Xin Min, Hui Zhang, Zhong Zhang
Summary: Inspired by the structures of fine hairs and cilia in nature, this study successfully prepared hairy surfaces with superhydrophobicity, abrasion resistance, and drag-reducing effect. The optimal surfaces exhibited excellent underwater stability, high drag reduction efficiency at low shearing rates, and could be easily manufactured on a large scale.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Mechanics
Darren G. Crowdy
Summary: This study presents analytical solutions for longitudinal flow in an annular superhydrophobic pipe with one side being a fully no-slip wall and the other side decorated with longitudinally striped no-shear pattern. It shows how these solutions generalize previous solutions to mixed boundary value problems, providing insights into the hydrodynamic slip enhancement in superhydrophobic surfaces. The study also highlights the importance of maximizing uninterrupted no-shear regions for optimal slip performance in designing slippery pipes.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Liuzhen Ren, Haibao Hu, Luyao Bao, Mengzhuo Zhang, Jun Wen, Luo Xie
Summary: The gas-liquid interface (GLI) over superhydrophobic surfaces (SHSs), where the flow slips, is crucial for reducing frictional drag in underwater applications. A new hybrid slip boundary condition has been proposed to explain inconsistent slip conditions reported in the literature under different groove length scales and unify existing exclusive slip assumptions.
Article
Chemistry, Physical
Qinghui Chen, Chuanqi Zhang, Yukui Cai, Xichun Luo, Bing Wang, Qinghua Song, Zhanqiang Liu
Summary: This paper proposes a nanosecond pulse laser ablation-chemical etching (LACE) process to prepare a patterned superhydrophobic surface on 316L stainless steel, which has controllable microstructures in terms of direction, period, and height. The experimental results indicate that the laser scanning speed is a prerequisite for the formation of microstructures, and the average laser power and scanning interval are important factors affecting the period and height of microstructures. The superhydrophobic surface achieves a rebound coefficient of 82.85% for water droplets with a contact angle of 154.7 degrees (+/- 0.6 degrees), demonstrating exceptional water repellency. Drag reduction tests show that it effectively reduces flow resistance in microchannels, with a maximum drag reduction rate of 29.83%. This work demonstrates the reliable application of the LACE process in drag reduction and water repellency, utilizing superhydrophobic surfaces with controllable microstructures and structural parameters.
APPLIED SURFACE SCIENCE
(2023)
Article
Optics
K. M. Tanvir Ahmmed, Edwin Jee Yang Ling, Phillip Servio, Anne-Marie Kietzig
OPTICS AND LASERS IN ENGINEERING
(2015)
Article
Nanoscience & Nanotechnology
K. M. Tanvir Ahmmed, Christian Patience, Anne-Marie Kietzig
ACS APPLIED MATERIALS & INTERFACES
(2016)
Article
Engineering, Chemical
K. M. Tanvir Ahmmed, Roozbeh Mafi, Anne-Marie Kietzig
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2018)
Article
Engineering, Environmental
Sultana R. Syeda, Shammi A. Ferdousi, K. M. Tanvir Ahmmed
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
(2012)
Review
Chemistry, Analytical
K. M. Tanvir Ahmmed, Colin Grambow, Anne-Marie Kietzig
Article
Mechanics
Sara Moghtadernejad, Mehdi Jadidi, K. M. Tanvir Ahmmed, Christian Lee, Ali Dolatabadi, Anne-Marie Kietzig
Article
Infectious Diseases
Sahra Fonseca, Marie-Pierre Cayer, K. M. Tanvir Ahmmed, Nima Khadem-Mohtaram, Steve J. Charette, Danny Brouard
Summary: Technological innovations and quality control processes in blood supply organizations have improved blood safety, but the risk of transfusion-transmitted infection remains. Applying an antibacterial coating on medical devices is a promising strategy to prevent infection spread. This study characterized the antibacterial activity of an SiO2 nanoparticular coating on polymeric materials used in the biomedical field and found that it significantly reduced bacterial growth. However, further improvements are needed for more complex matrices.
Article
Engineering, Chemical
K. M. Tanvir Ahmmed, Julian Montagut, Anne-Marie Kietzig
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2017)
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.