Exceptional Mineral Scaling Resistance from the Surface Gas Layer: Impacts of Surface Wetting Properties and the Gas Layer Charging Mechanism

IF 6.7 Q1 ENGINEERING, ENVIRONMENTAL ACS Environmental Au Pub Date : 2022-05-31 DOI:10.1021/acsenvironau.2c00011
Thomas Horseman,  and , Shihong Lin*, 
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引用次数: 1

Abstract

Mineral scaling is a phenomenon that occurs on submerged surfaces in contact with saline solutions. In membrane desalination, heat exchangers, and marine structures, mineral scaling reduces process efficiency and eventually leads to process failure. Therefore, achieving long-term scaling resistance is beneficial to enhancing process performance and reducing operating and maintenance costs. While evidence shows that superhydrophobic surfaces may reduce mineral scaling kinetics, prolonged scaling resistance is limited due to the finite stability of the entrained gas layer present in a Cassie–Baxter wetting state. Additionally, superhydrophobic surfaces are not always feasible for all applications, but strategies for long-term scaling resistance with smooth or even hydrophilic surfaces are often overlooked. In this study, we elucidate the role of interfacial nanobubbles on the scaling kinetics of submerged surfaces of varied wetting properties, including those that do not entrain a gas layer. We show that both solution conditions and surface wetting properties that promote interfacial bubble formation enhances scaling resistance. In the absence of interfacial bubbles, scaling kinetics decrease as surface energy decreases, while the presence of bulk nanobubbles enhances the scaling resistance of the surface with any wetting property. The findings in this study allude to scaling mitigation strategies that are enabled by solution and surface properties that promote the formation and stability of interfacial gas layers and provide insights to surface and process design for greater scaling resistance.

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来自表面气层的特殊矿物抗结垢性:表面润湿特性和气层充注机制的影响
矿物结垢是一种发生在与盐溶液接触的浸没表面上的现象。在膜脱盐、热交换器和海洋结构中,矿物结垢会降低工艺效率并最终导致工艺失败。因此,实现长期抗结垢有利于提高工艺性能,降低操作和维护成本。虽然有证据表明,超疏水表面可能会降低矿物结垢动力学,但由于在Cassie-Baxter润湿状态下携带的气层的有限稳定性,延长的结垢阻力是有限的。此外,超疏水表面并不总是适用于所有应用,但光滑甚至亲水表面的长期抗结垢策略经常被忽视。在这项研究中,我们阐明了界面纳米气泡在不同润湿特性的浸没表面的结垢动力学中的作用,包括那些不携带气体层的表面。我们发现促进界面气泡形成的溶液条件和表面润湿特性都增强了抗结垢性。在没有界面气泡的情况下,随着表面能的降低,结垢动力学降低,而体纳米气泡的存在增强了具有任何润湿性能的表面的结垢阻力。本研究的发现暗示了通过溶液和表面特性促进界面气层形成和稳定性的结垢缓解策略,并为表面和工艺设计提供了更大的抗结垢性。
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ACS Environmental Au
ACS Environmental Au 环境科学-
CiteScore
7.10
自引率
0.00%
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0
期刊介绍: ACS Environmental Au is an open access journal which publishes experimental research and theoretical results in all aspects of environmental science and technology both pure and applied. Short letters comprehensive articles reviews and perspectives are welcome in the following areas:Alternative EnergyAnthropogenic Impacts on Atmosphere Soil or WaterBiogeochemical CyclingBiomass or Wastes as ResourcesContaminants in Aquatic and Terrestrial EnvironmentsEnvironmental Data ScienceEcotoxicology and Public HealthEnergy and ClimateEnvironmental Modeling Processes and Measurement Methods and TechnologiesEnvironmental Nanotechnology and BiotechnologyGreen ChemistryGreen Manufacturing and EngineeringRisk assessment Regulatory Frameworks and Life-Cycle AssessmentsTreatment and Resource Recovery and Waste Management
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