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
Physics, Applied
Hwi-Chan Ham, Jack. J. Yoh
Summary: This study proposes a method to reduce liquid spark breakdown without being affected by electrode wear, successfully extending the possible breakdown gap distance and enhancing shockwave intensity.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Dorsa Sadat Rabizadeh, Majid Abbasalizadeh
Summary: This study aims to investigate the acting mechanism of superhydrophobic surfaces and the factors affecting their performance and efficiency in a three-dimensional flow field. The hydrodynamic performance of a conventional microchannel is numerically assessed with smooth walls and superhydrophobic surfaces at different flow rates. The results show that superhydrophobic surfaces slightly increase the pressure drop in the microchannel, but the increase is not significant. The overall acting mechanism of superhydrophobic surfaces in microchannels is determined by factors such as vortices, periodicity of cavities, and pressure difference.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Jesse F. Collis, Selim Olcum, Debadi Chakraborty, Scott R. Manalis, John E. Sader
Summary: The Navier slip condition describes the motion of a liquid relative to a neighboring solid surface, with its characteristic Navier slip length being a constitutive property of the solid-liquid interface. Measurement of this slip length is complicated due to its small magnitude, but experimental technique that interrogates the Navier slip length on individual nanoparticles immersed in liquid has been developed with subnanometer precision. Proof-of-principle experiments show a constant slip length of 2.7 +/- 0.6 nm (95% C.I.) on individual, citrate-stabilized, gold nanoparticles in water, independent of particle size, motivating further studies to validate existing molecular simulation data on slip.
Article
Thermodynamics
Geng Di Sia, Chang Sheng Lim, Ming Kwang Tan, Gooi Mee Chen, Yew Mun Hung
Summary: A study investigates subcooled flow boiling in a microchannel heat sink with superhydrophilic and superhydrophobic graphene nanoplatelets (GNPs) composite coatings. The superhydrophobic coating significantly enhances the flow boiling performance, with improved critical heat flux and heat transfer coefficient.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Environmental
Jing Lin, Shenglin Yan, Qing Hu, Zhihang Wei, Zhenmin Cheng
Summary: Hydrophobic electrode enhances CO2 mass transfer for carbon dioxide electroreduction reaction (CO2ER) in microchannel reactor. Effective control of catalyst surface wettability is crucial to achieve efficient CO2ER performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Ali Heidarian, Roohollah Rafee, Mohammad Sadegh Valipour
Summary: This study investigated the hydrodynamic features of nanofluids flowing in straight microchannels with walls of varying hydrophobicities using the finite volume method. The results indicated that nanofluids increase pumping power, with superhydrophobic walls and nanofluids significantly reducing pressure drop.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Physical
T. P. Rasitha, John Philip
Summary: This paper presents a simple, cost-effective, fast, scalable, and sustainable method for fabricating mechanically durable superhydrophobic surfaces on titanium. By utilizing rapid breakdown anodization and molten stearic acid chemical modification, the preparation time is reduced to just one minute. The optimized process results in a highly hierarchical micro-nanostructure with excellent superhydrophobic properties and abrasion resistance.
APPLIED SURFACE SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Yunren Sui, Zengguang Sui, Guangda Liang, Wei Wu
Summary: This study proposes a solution to the energy consumption limitation of electric vehicle heating systems by introducing a microchannel heat exchanger with superhydrophobic surface treatment as a heat pump evaporator. The performance of the system is greatly improved, resulting in an extended single-charge driving distance.
Article
Materials Science, Multidisciplinary
Kai Liao, Wenjun Wang, Xuesong Mei, Wanqin Zhao, Hai Yuan, Mingqiong Wang, Bozhe Wang
Summary: This paper proposes an integrated design and preparation method for drag reduction microchannels on the silica glass surface, which can reduce flow resistance. The drag-reducing superhydrophobic silica glass surface is successfully prepared using femtosecond laser technology combined with the plasma deposition process. The prepared surface shows good stability under different test conditions. Microfluidic devices with drag reduction microchannels significantly reduce flow resistance.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Jingjing Chen, Zhongfan Luo, Peishi Dong, Shanshan Wang, Xiaoyan Ji, Jiahua Zhu, Xiaohua Lu, Liwen Mu
Summary: A new strategy for high-efficient heat transfer in non-Newtonian fluids using a superhydrophobic coating is presented in this study. The slip behavior and heat transfer processes of a typical non-Newtonian fluid on the coating are investigated, and a novel porous spherical superhydrophobic coating is obtained. The results show that the shear stress in electrodeposition is a key parameter to control the morphology and wetting ability of the coating. A new parameter, Re/l(s)*, is proposed for guiding heat transfer enhancement with slippage.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Thermodynamics
Umair Aziz, Muhammad Nadeem, Feng Xin, Mustafa Kilic, Atta Ullah
Summary: In this study, the slug flow in a superhydrophobic microchannel was computationally investigated. The results showed that the slug flow performed much better in terms of heat transfer enhancement compared to single-phase flows.
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Zhe Ying, Shuai Zhang, Bo Chen, Bin Jia, Fucong Fei, Minhao Zhang, Haijun Zhang, Xuefeng Wang, Fengqi Song
Summary: In this study, we investigate the dissipationless transport properties of chiral edge state (CES) in the Chern insulator MnBi2Te4 devices. We observe a near-zero longitudinal resistance and a quantized Hall plateau similar to 0.97h/e(2) up to 22 K. The CES shows different temperature dependencies, with well-preserved dissipationless transport below 6 K, variable range hopping from 6 to 22 K, and thermal activation above 22 K. We also find that a current of over 1.4 mu A at 2 K can break the dissipationless transport. Additionally, a p-n junction has almost no influence on the CES of the Chern insulator MnBi2Te4.
Article
Virology
Davaajargal Igori, Hye Sun Cho, Hyun-Soon Kim, Jeong Mee Park, Hyo-Jun Lee, Suk-Yoon Kwon, Jae Sun Moon
Summary: The complete genomic sequence of Scorzonera virus A (SCoVA) from a plant in South Korea was determined, showing close relationship with other potyviruses, suggesting that it may be a novel member of the genus Potyvirus.
ARCHIVES OF VIROLOGY
(2021)
Article
Thermodynamics
Allison J. Mahvi, Kalyan Boyina, Andy Musser, Stefan Elbel, Nenad Miljkovic
Summary: The study focuses on improving the efficiency of cabin heating in electric vehicles by replacing resistive heating elements with an air-source heat pump system. Surface wettability modification of aluminum heat pump evaporators showed that superhydrophobic outer surface could delay frost formation and maintain higher heat transfer rates. This research has the potential to increase the efficiency of automotive heat pumps and reduce energy consumption of electric vehicles.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Physics, Fluids & Plasmas
Clement Gouiller, Florence Raynal, Laurent Maquet, Mickael Bourgoin, Cecile Cottin-Bizonne, Romain Volk, Christophe Ybert
Summary: In this experimental study, the mixing properties of interfacial colloidal floaters were influenced by chemical and hydrodynamical currents generated by self-propelled camphor disks swimming at the air-water interface. Despite reaching a statistically stationary state, the floaters remained only partially mixed, resulting from a competition between mixing and unmixing processes. Additionally, the system developed turbulent-like concentration spectra with various regions characterized by different flow effects.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Multidisciplinary Sciences
Shaobin Zhang, Claudia Contini, James W. Hindley, Guido Bolognesi, Yuval Elani, Oscar Ces
Summary: The authors have reported a biocompatible all aqueous emulsion system with motion induced by the Marangoni effect, showing negative chemotaxis. This system offers new possibilities for research in motion-related biological processes with its biocompatibility, motility, and partitioning abilities.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Fluids & Plasmas
Dolachai Boniface, Cecile Cottin-Bizonne, Francois Detcheverry, Christophe Ybert
Summary: The research focuses on interfacial swimmers that propel themselves by releasing surfactants, with a key role played by Marangoni effects. Low Pe* regime shows bistability with threshold Marangoni number, while high Pe* regime features a robust scaling law with exponent close to 3/4.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Chemistry, Physical
Natsuda Klongvessa, Christophe Ybert, Cecile Cottin-Bizonne, Takeshi Kawasaki, Mathieu Leocmach
Summary: In this study, the researchers investigate the behavior of active glasses, which are defined by relaxation times longer than the observation time. They demonstrate that there is a nonmonotonic response in the dynamics of active glass, and attribute it to activity enhanced aging.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Latinka Slavkovic-Beskoski, Ljubisa Ignjatovic, Guido Bolognesi, Danijela Maksin, Aleksandra Savic, Goran Vladisavljevic, Antonije Onjia
Summary: A new DSPME sorbent was synthesized using microfluidic emulsification/photopolymerization. This sorbent was applied for simple, fast, and sensitive vortex-assisted DSPME of rare earth elements in coal fly ash leachate, prior to their quantification by ICP-MS.
Article
Biochemistry & Molecular Biology
Minjun Chen, Ruqaiya Aluunmani, Guido Bolognesi, Goran T. Vladisavljevic
Summary: Poly(ethylene glycol) diacrylate (PEGDA) microgels with tuneable size and porosity have various applications. The microgels were produced using modular droplet microfluidics and their properties were studied.
Article
Chemistry, Physical
Naval Singh, Adnan Chakra, Goran T. Vladisavljevic, Cecile Cottin-Bizonne, Christophe Pirat, Guido Bolognesi
Summary: This study presents an optimized protocol for the manufacturing of composite flow focusing devices and demonstrates three different applications of these devices. The devices enable particle spreading, accumulation, and synthesis of liposomes through diffusiophoresis transport induced by salt concentration gradients. The effects of particle properties and device structure on particle dynamics were investigated, and controlled narrow size distributions of liposomes could be achieved. Composite NOA/silicon flow junction devices offer a competitive alternative to conventional PDMS chips and support a wide range of microfluidic applications.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Naval Singh, Goran T. Vladisavljevic, Francois Nadal, Cecile Cottin-Bizonne, Christophe Pirat, Guido Bolognesi
Summary: The study investigates the effects of salt contrast and groove depth on the accumulation process of colloidal particles in microgrooves, and determines the experimental conditions that lead to high particle concentration peaks. The sufficient and necessary conditions for particle accumulation are derived. The controlled and enhanced accumulation of colloidal particles in dead-end structures by solute concentration gradients has potential applications in soft matter and living systems.
Article
Nanoscience & Nanotechnology
Sumit Parvate, Goran T. Vladisavljevic, Nico Leister, Alexandros Spyrou, Guido Bolognesi, Daniele Baiocco, Zhibing Zhang, Sujay Chattopadhyay
Summary: We developed a Lego-inspired microfluidic device that can encapsulate both organic and aqueous phase change materials (PCMs) with high reproducibility. The device produces monodisperse double emulsion droplets that encapsulate hexadecane (HD) and salt hydrate SP21EK in a UV-curable polymeric shell. These microcapsules exhibit high encapsulation efficiencies and thermal stability, and can sustain over 100 melting-crystallization cycles. Furthermore, when titanium dioxide nanoparticles (TiO2 NPs) are added, the microcapsules show remarkable photocatalytic activity and improved mechanical properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Adnan Chakra, Naval Singh, Goran T. Vladisavljevic, Francois Nadal, Cecile Cottin-Bizonne, Christophe Pirat, Guido Bolognesi
Summary: The authors reveal a physical mechanism for the preconcentration, sorting, and characterization of charged polystyrene nanobeads and liposomes in a straight micron-sized channel. By creating a salt concentration gradient perpendicular to the flow, fluorescent nanobeads accumulate into symmetric regions, appearing as distinct stripes. Diffusio-osmosis along the channel walls plays a crucial role in particle dynamics. Additionally, a double Ψ-junction microfluidic device is developed for size-based separation and characterization of nanobeads, as well as for measuring zeta potential and lipid composition of liposomes. This strategy has potential applications in microfluidic bioanalytical testing.
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
Polymer Science
Minjun Chen, Conner Thacker, Ksenija R. Kumric, Radivoje Prodanovic, Guido Bolognesi, Goran T. Vladisavljevic
Summary: Monodispersed PEGDA/AA microgels with a controllable negative charge and macroporous internal structure were produced using a Lego-inspired droplet microfluidic device. The microgels exhibited tunable surface charge and macroporosity, thereby showing improved adsorption properties towards organic dyes and high removal capacity of Cu(II) ions.
Article
Nanoscience & Nanotechnology
Zilin Zhang, Ekanem E. Ekanem, Mitsutoshi Nakajima, Guido Bolognesi, Goran T. Vladisavljevic
Summary: Monodispersed sirolimus-loaded poly(lactic-co-glycolic acid) microspheres were successfully produced using high-throughput microfluidic technology. As the drug loading increased, the morphology of the particles evolved from homogeneous microspheres to patchy particles and eventually to Janus particles with fully segregated drug and polymer regions.
ACS APPLIED BIO MATERIALS
(2022)
Article
Physics, Fluids & Plasmas
Clement Gouiller, Christophe Ybert, Cecile Cottin-Bizonne, Florence Raynal, Mickael Bourgoin, Romain Volk
Summary: The study focuses on the dynamics of a group of Marangoni surfers in a two-dimensional and unconfined space, ranging from single swimmer behavior to the interaction of multiple particles. The model successfully reproduces the transition observed in experiments from dispersion to crystallization at different swimmer densities.
