Extreme Antiscaling Performance of Slippery Omniphobic Covalently Attached Liquids

Zhao, Hanyang; Deshpande, Chirag Anand; Li, Longnan; Yan, Xiao; Hoque, Muhammad Jahidul; Kuntumalla, Gowtham; Rajagopal, Manjunath C.; Chang, Ho Chan; Meng, Yuquan; Sundar, Sreenath; Ferreira, Placid M.; Shao, Chenhui; Salapaka, Srinivasa M.; Sinha, Sanjiv; Miljkovic, Nenad

doi:10.1021/acsami.9b22145

Cited by 61 publications

(56 citation statements)

References 72 publications

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“…21,[25][26] The detailed process of SOCAL development is explained elsewhere. 21,24 Briefly, we started by making a 100:10:1 wt% mixture of isopropanol: Dimethyldimethoxysilane (DMDMS, CAS#:…”

Section: Socal Coatingmentioning

confidence: 99%

Scalable Corrosion-Resistant Coatings for Thermal Applications

Khodakarami

Zhao

Rabbi

et al. 2021

ACS Appl. Mater. Interfaces

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Corrosion of metallic substrates is a problem for a variety of applications. Corrosion can be mitigated with the use of an electrically insulating coating protecting the substrate. Thick millimetric coatings, such as paints, are generally more corrosion-resistant when compared to nanoscale coatings. However, for thermal systems, thick coatings are undesirable due to the resulting decrease in the overall heat transfer stemming from the added coating thermal resistance. Hence, the development of ultrathin (<10 μm) coatings is of great interest. Ultrathin inorganic silicon dioxide (SiO2) coatings applied by sol–gel chemistries or chemical vapor deposition, as well as organic coatings such as Parylene C, have great anticorrosion performance due to their high dielectric breakdown and low moisture permeability. However, their application to arbitrarily shaped metals is difficult or expensive. Here, we develop a sol–gel solution capable of facile and controllable dip coating on arbitrary metals, resulting in a very smooth (<5 nm roughness), thin (∼3 μm), and conformal coating of dense SiO2. To benchmark our material, we compared the corrosion performance with in-house synthesized superhydrophobic aluminum and copper samples, Parylene C-coated substrates, and smooth hydrophobic surfaces functionalized with a hydrophobic self-assembled monolayer. For comparison with state-of-the-art commercial coatings, copper substrates were coated with an organo-ceramic SiO2 layer created by an elevated temperature and atmospheric pressure metal organic chemical vapor deposition process. To characterize corrosion performance, we electrochemically investigated the corrosion resistance of all samples through potentiodynamic polarization studies and electrochemical impedance spectroscopy. To benchmark the coating durability and to demonstrate scalability, we tested internally coated copper tubes in a custom-built corrosion flow loop to simulate realistic working conditions with shear and particulate saltwater flow. The sol–gel and Parylene C coatings demonstrated a 95% decrease in corrosion rate during electrochemical tests. Copper tube weight loss was reduced by 75% for the sol–gel SiO2-coated tubes when seawater was used as the corrosive fluid in the test loop. This work not only demonstrates scalable coating methodologies for applying ultrathin anticorrosion coatings but also develops mechanistic understanding of corrosion mechanisms on a variety of functional surfaces and substrates.

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Section: Socal Coatingmentioning

confidence: 99%

Scalable Corrosion-Resistant Coatings for Thermal Applications

Khodakarami

Zhao

Rabbi

et al. 2021

ACS Appl. Mater. Interfaces

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“…Slippery liquid-infused porous surfaces (SLIPSs) have attracted enormous interest in anti-adhesion applications such as antiicing, [1][2][3][4] anti-fouling, [5][6][7][8] anti-scaling, [9,10] etc. since first reported by Aizenberg's group in 2011.…”

Section: Introductionmentioning

confidence: 99%

Endogenous Ionic‐Liquid‐Infused Coatings by Phase Separation for Anti‐Icing and Anti‐Bacterial Applications

Wang

Liang

et al. 2022

Adv Materials Inter

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Slippery liquid‐infused porous surfaces have received great attention in anti‐adhesion applications, and ionic liquids are selected as the infiltrated liquid in recent research due to their non‐volatility. Beyond the complicated steps, infiltrating the viscous ionic liquid within a porous structure is challenging during the conventional fabrication process. Herein, a facile method is proposed to fabricate polyurethane‐based slippery ionic‐liquid‐infused coatings in one step through a phase separation process. The solid structure grows from the ionic liquid through a liquid–liquid phases separation process. The coatings perform excellent anti‐bacterial and anti‐icing properties owing to the biocide nature, lubricity, and low freezing point of ionic liquids.

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“…Past methods to reduce fouling have mostly focused on precipitation fouling of single salts. , However, complexities arise in the fouling mechanisms when the solution contains a variety of ions. In contrast, past research utilizing complex solutions has mainly focused on static fluids .…”

Section: Introductionmentioning

confidence: 99%

Scalable Slippery Omniphobic Covalently Attached Liquid Coatings for Flow Fouling Reduction

Zhao

Khodakarami

Deshpande

et al. 2021

ACS Appl. Mater. Interfaces

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Fouling and accretion have negative impacts on a plethora of processes. To mitigate heterogeneous nucleation of a foulant, lowering the surface energy and reducing surface roughness are desired. Here, we develop a multilayer coating to mitigate solution-based heterogeneous fouling for internal flows. The first layer is a sol–gel silicon dioxide (SiO2) coating, which acts as a corrosion barrier, creates the surface chemistry needed for covalent bonding of the slippery omniphobic covalently attached liquid (SOCAL), and ensures an atomically smooth (<1 nm) interface. The second layer bonded to SiO2 is SOCAL, which further reduces the nucleation rate due to its low surface energy (<12 mJ/m2). The presence of a consistent sol–gel SiO2 base coating to bind to the SOCAL enables application to various metallic substrates. The coating is solid, making it more durable when compared to alternative slippery liquid-infused surfaces (LIS) that suffer from lubricant loss. To demonstrate performance and scalability, we apply our coating to the internal walls of aluminum (Al) tubing and test its fouling performance in a flow-fouling setup with single-phase flow of synthetic seawater. The seawater consists of saturated calcium sulfide (CaSO4), and fouling is characterized in both laminar and turbulent flow regimes (Reynolds numbers 1030 to 9300). Our coating demonstrated a reduction in salt scale fouling by 95% when compared to uncoated Al tubes. Furthermore, we show our coating to withstand turbulent flow conditions, mechanical abrasion loading, and corrosive environments for durations much longer than LIS. Our work demonstrates a coating methodology applicable to a variety of metal substrates and internal passages to achieve antifouling in single-phase flows.

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Extreme Antiscaling Performance of Slippery Omniphobic Covalently Attached Liquids

Cited by 61 publications

References 72 publications

Scalable Corrosion-Resistant Coatings for Thermal Applications

Scalable Corrosion-Resistant Coatings for Thermal Applications

Endogenous Ionic‐Liquid‐Infused Coatings by Phase Separation for Anti‐Icing and Anti‐Bacterial Applications

Scalable Slippery Omniphobic Covalently Attached Liquid Coatings for Flow Fouling Reduction

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