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Atomic force microscopy 1

CFD 1

Droplet interactions 1

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aggregation kinetics 1

colloids and interfaces 1

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Gold modified microelectrode for direct tetracycline detection

Hongtao WANG, Huimin ZHAO, Xie QUAN

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 3,   Pages 313-319 doi: 10.1007/s11783-011-0323-5

Abstract: determination of tetracycline (TC) by the microelectrode, which was fabricated by electrodeposited gold colloids

Keywords： microelectrode     tungsten tip     gold colloids     tetracycline    

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A CFD study of the transport and fate of airborne droplets in a ventilated office: The role of droplet−droplet interactions

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 3, doi: 10.1007/s11783-021-1465-8

Abstract:

• Coulomb and Lennard−Jones forces were considered for droplet interactions.

Keywords： Droplet interactions     Aerosols     Colloids     CFD     Transport     Fate    

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Influence of surface modified mixed metal oxide nanoparticles on the electrochemical and mechanical properties of polyurethane matrix

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1,   Pages 1-14 doi: 10.1007/s11705-022-2176-9

Abstract: Newly synthesized functional nanoparticles, 3-amino-1,2,4-triazole (ATA)/SiO2–TiO2 were introduced to the polyurethane (PU) matrix. Electrochemical techniques were used to investigate the barrier properties of the synthesized PU–ATA/SiO2–TiO2 nanocomposite coated steel specimen. In natural seawater, electrochemical impedance spectroscopy experiments indicated outstanding protective behaviour for the PU–ATA/SiO2–TiO2 coated steel. The coating resistance (Rcoat) of PU–ATA/SiO2–TiO2 was determined to be 2956.90 kΩ·cm–2. The Rcoat of the PU–ATA/SiO2–TiO2 nanocomposite coating was found to be over 50% higher than the PU coating. The current measured along the scratched surface of the PU–ATA/SiO2–TiO2 coating was found to be very low (1.65 nA). The enhanced ATA/SiO2–TiO2 nanoparticles inhibited the entry of electrolytes into the coating interface, as revealed by scanning electron microscopy/energy dispersive X-ray spectroscopy and X-ray diffraction analysis of the degradation products. Water contact angle testing validated the hydrophobic nature of the PU–ATA/SiO2–TiO2 coating (θ = 115.4°). When the concentration of ATA/SiO2−TiO2 nanoparticles was 2 wt %, dynamic mechanical analysis revealed better mechanical properties. Therefore, the newly synthesised PU–ATA/SiO2–TiO2 nanocomposite provided excellent barrier and mechanical properties due to the addition of ATA/SiO2–TiO2 nanoparticles to the polyurethane, which inhibited material degradation and aided in the prolongation of the coated steel’s life.

Keywords： nanoparticle     nanocomposite coatings     dynamic mechanical analysis     electrochemical techniques     corrosion     colloids    

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Effects of humic acid and surfactants on the aggregation kinetics of manganese dioxide colloids

Xiaoliu HUANGFU,Yaan WANG,Yongze LIU,Xixin LU,Xiang ZHANG,Haijun CHENG,Jin JIANG,Jun MA

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 1,   Pages 105-111 doi: 10.1007/s11783-014-0726-1

Abstract: The aggregation of common manganese dioxide (MnO ) colloids has great impact on their surface reactivityNevertheless, little is known about the aggregation kinetics of MnO colloids and the effect of humicIn the presence of HA, MnO colloids were significantly stabilized with a critical coagulation concentration

Keywords： humic acid     surfactant     aggregation kinetics     drinking water     manganese dioxide colloids    

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Intermolecular and Surface Interactions in Engineering Processes Review

Jiawen Zhang, Hongbo Zeng

Engineering 2021, Volume 7, Issue 1,   Pages 63-83 doi: 10.1016/j.eng.2020.08.017

Abstract:

Interactions involving chemical reagents, solid particles, gas bubbles, liquid droplets, and solid surfaces in complex fluids play a vital role in many engineering processes, such as froth flotation, emulsion and foam formation, adsorption, and fouling and anti-fouling phenomena. These interactions at the molecular, nano-, and micro scale significantly influence and determine the macroscopic performance and efficiency of related engineering processes. Understanding the intermolecular and surface interactions in engineering processes is of both fundamental and practical importance, which not only improves production technologies, but also provides valuable insights into the development of new materials. In this review, the typical intermolecular and surface interactions involved in various engineering processes, including Derjaguin–Landau–Verwey–Overbeek (DLVO) interactions (i.e., van der Waals and electrical doublelayer interactions) and non-DLVO interactions, such as steric and hydrophobic interactions, are first introduced. Nanomechanical techniques such as atomic force microscopy and surface forces apparatus for quantifying the interaction forces of molecules and surfaces in complex fluids are briefly introduced. Our recent progress on characterizing the intermolecular and surface interactions in several engineering systems are reviewed, including mineral flotation, petroleum engineering, wastewater treatment, and energy storage materials. The correlation of these fundamental interaction mechanisms with practical applications in resolving engineering challenges and the perspectives of the research field have also been discussed.

Keywords： Intermolecular and surface interactions     Colloids     Emulsions     Interface science     Engineering processes    

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Probing the Interfacial Forces and Surface Interaction Mechanisms in Petroleum Production Processes Review

Diling Yang,Xuwen Peng,Qiongyao Peng,Tao Wang,Chenyu Qiao,Ziqian Zhao,Lu Gong,Yueliang Liu,Hao Zhang,Hongbo Zeng,

Engineering 2022, Volume 18, Issue 11,   Pages 49-61 doi: 10.1016/j.eng.2022.06.012

Abstract:

Despite the advances that have been made in renewable energy over the past decade, crude oil or petroleum remains one of the most important energy resources to the world. Petroleum production presents many challenging issues, such as the destabilization of complex oil–water emulsions, fouling phenomena on pipelines and other facilities, and water treatment. These problems are influenced by the molecular forces at the oil/water/solid/gas interfaces involved in relevant processes. Herein, we present an overview of recent advances on probing the interfacial forces in several petroleum production processes (e.g., bitumen extraction, emulsion stabilization and destabilization, fouling and antifouling phenomena, and water treatment) by applying nanomechanical measurement technologies such as a surface forces apparatus (SFA) and an atomic force microscope (AFM). The interaction forces between bitumen and mineral solids or air bubbles in the surrounding fluid media determine the bitumen liberation and flotation efficiency in oil sands production. The stability of complex oil/water emulsions is governed by the forces between emulsion drops and particularly between interface-active species (e.g., asphaltenes). Various oil components (e.g., asphaltenes) and emulsion drops interact with different substrate surfaces (e.g., pipelines or membranes), influencing fouling phenomena, oil–water separation, and wastewater treatment. Quantifying these intermolecular and interfacial forces has advanced the mechanistic understanding of these interfacial interactions, facilitating the development of advanced materials and technologies to solve relevant challenging issues and improve petroleum production processes. Remaining challenges and suggestions on future research directions in the field are also presented.

Keywords： Intermolecular and surface forces     Interface     Emulsion     Colloids     Fouling and antifouling     Water treatment    

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Title Author Date Type Operation

Gold modified microelectrode for direct tetracycline detection

Hongtao WANG, Huimin ZHAO, Xie QUAN

Journal Article

A CFD study of the transport and fate of airborne droplets in a ventilated office: The role of droplet−droplet interactions

Journal Article

Influence of surface modified mixed metal oxide nanoparticles on the electrochemical and mechanical properties of polyurethane matrix

Journal Article

Effects of humic acid and surfactants on the aggregation kinetics of manganese dioxide colloids

Xiaoliu HUANGFU,Yaan WANG,Yongze LIU,Xixin LU,Xiang ZHANG,Haijun CHENG,Jin JIANG,Jun MA

Journal Article

Intermolecular and Surface Interactions in Engineering Processes

Jiawen Zhang, Hongbo Zeng

Journal Article

Probing the Interfacial Forces and Surface Interaction Mechanisms in Petroleum Production Processes

Diling Yang,Xuwen Peng,Qiongyao Peng,Tao Wang,Chenyu Qiao,Ziqian Zhao,Lu Gong,Yueliang Liu,Hao Zhang,Hongbo Zeng,

Journal Article