Enduring liquid repellency through slippery ionic liquid-infused organogels

Salbaum, Tobias; Galvan, Yaraset; Haumann, Marco; Wasserscheid, Peter; Zárraga, Ramón; Vogel, Nicolas

doi:10.1039/d0ta10237g

Cited by 11 publications

(10 citation statements)

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“…53−55 In all cases, trimethylamine as an organic base was added to have free amines both on the PDA surface and the reactive lubricant. For silicone oil and [TBMP][NTf 2 ], only amino-functionalized components (MAP-PDMS and aminopropyl tributylphosphosphonium bis(trifluoromethylsulfonyl)imide [APTBP][NTf 2 ], 73 respectively) were available, while for the hydrocarbon oil lubricants, reactive lubricant molecules with all possible functional groups were explored (Figure 3, Table S1). In addition, we compared PDA base layers without (Figure 3a Similarly, amine-containing dodecane conferred slipperiness and repellency on both types of substrates, indicated by low CAH values below 5°(Figure 3b,f).…”

Section: Resultsmentioning

confidence: 99%

“…As lubricants, beside silicone oil, we chose hexadecane, olive oil, and a phosphonium-based ionic liquid, tributylmethylphosphosphonium bis(trifluoromethylsulfonyl)imide [TBMP][NTf 2 ], as representative examples of conventional hydrocarbon oils, natural oils, and ionic liquids (Figure ). The latter can be important for the design of repellent surfaces with long-term stability at elevated temperatures, and in the context of supported ionic liquid catalysis (SILP). − The structural formula of olive oil, which is composed of multiple fatty acids, is simplified to oleic acid in Figure . As reactive species, we chose available molecules with a chemical structure matching that of the lubricant, but containing amino, thiol, or acid chloride groups.…”

Section: Resultsmentioning

confidence: 99%

“…The nucleophilic moieties can undergo reactions via Michael addition (or Schiff-base formation in the case of amines), , while the electrophilic acid chlorides can react with remaining hydroxyl or amino groups in the PDA. − In all cases, trimethylamine as an organic base was added to have free amines both on the PDA surface and the reactive lubricant. For silicone oil and [TBMP][NTf 2 ], only amino-functionalized components (MAP-PDMS and aminopropyl tributylphosphosphonium bis(trifluoromethylsulfonyl)imide [APTBP][NTf 2 ], respectively) were available, while for the hydrocarbon oil lubricants, reactive lubricant molecules with all possible functional groups were explored (Figure , Table S1). In addition, we compared PDA base layers without (Figure a–d) and with thermal heat treatment (130 °C, 1 h) in air (Figure e–h).…”

Section: Resultsmentioning

confidence: 99%

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From Sticky to Slippery: Self-Functionalizing Lubricants for In Situ Fabrication of Liquid-Infused Surfaces

Chiera

Koch

Bleyer

et al. 2022

ACS Appl. Mater. Interfaces

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Liquid-infused surfaces offer a versatile approach to create self-cleaning coatings. In such coatings, a thin film of a fluid lubricant homogeneously coats the substrate and thus prevents direct contact with a second, contaminating liquid. For stable repellency, the interfacial energies need to be controlled to ensure that the lubricant is not replaced by the contaminating liquid. Here, we introduce the concept of self-functionalizing lubricants. Functional molecular species that chemically match the lubricant but possess selective anchor groups are dissolved in the lubricant and self-adhere to the surface, forming the required surface chemistry in situ from within the applied lubricant layer. To add flexibility to the self-functionalizing concept, the substrate is first primed with a thin polydopamine base layer, which can be deposited to nearly any substrate material from aqueous solutions and retains reactivity toward electron-donating groups such as amines. The temporal progression of the in situ functionalization is investigated by ellipsometry and quartz crystal microbalance and correlated to macroscopic changes in contact angle and contact angle hysteresis. The flexibility of the approach is underlined by creating repellent coatings with various substrate/lubricant combinations. The prepared liquid-infused surfaces significantly reduce cement adhesion and provide easy-to-clean systems under real-world conditions on shoe soles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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From Sticky to Slippery: Self-Functionalizing Lubricants for In Situ Fabrication of Liquid-Infused Surfaces

Chiera

Koch

Bleyer

et al. 2022

ACS Appl. Mater. Interfaces

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“…However, the volatilization or the migration along with the moving droplets of liquid lubrications shortens the application durability of SLIPS. Replacing the traditional liquid lubricants with nonvolatile ionic liquids, or enhancing the binding between liquid lubricants with substrate, or exploring solid lubricants are considered effective in decreasing the depletion of lubricant layer [56][57][58]. In this text, our group fabricated a robust and temperature stable SLIPS by infusing unpolymerized ionic liquids into polyionogel modified porous aluminum oxide [59].…”

Section: Superslipperymentioning

confidence: 99%

Low friction of superslippery and superlubricity: A review

et al. 2022

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The issues regarding energy dissipation and component damage caused by the interface friction between a friction pair attract enormous attention to friction reduction. The key-enabling technique to realize friction reduction is the use of lubricants. The lubricants smooth the contact interfaces, achieving an ultralow friction contact, which is called superslippery or superlubricity. At present, superslippery and superlubricity are two isolated research topics. There is a lack of unified definition on superslippery and superlubricity from the viewpoint of tribology. Herein, this review aims at exploring the differences and relations between superslippery and superlubricity from their origin and application scenarios. Meanwhile, the challenges for developing superslippery surface and superlubricity surface are discussed. In addition, perspectives on the interactive development of these two surfaces are presented. We hope that our discussion can provide guidance for designing superslippery or superlubricity surfaces by using varies drag-reduction technologies.

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“…The OIGs stabilize the lubricating liquid by reserving it within the polymer network. Moreover, even if the surface lubricate layer is lost, the liquid held in the polymer network will diffuse from the matrix to the surface for replenishment 18,19 . However, it also restricts the liquid flow across the gel surface, and the fluidity of surface liquid is the underlying mechanism of self‐healing capacity of conventional SLIPSs.…”

Section: Introductionmentioning

confidence: 99%

Self‐repairing oil‐impregnated gel coatings based on reversible physical cross‐linking for anti‐fouling and anti‐corrosion

Deng

Zeng

et al. 2021

J of Applied Polymer Sci

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Corrosion and biofouling are the most severe threats to the security of engineering equipment and materials. Oil‐impregnated gel (OIG) is a promising coating material for both corrosion protection and biofouling prevention. Unfortunately, OIGs are prone to damage due to their weak mechanical strength, and most of the reported OIGs are irreversibly cross‐linked through covalent bonds. To meet the great demand of self‐repairable OIGs for their durable applications, we develop a self‐repairable OIG coating based on the reversible sol‐gel process of styrene‐isoprene‐styrene triblock copolymer (SIS) and n‐hexadecane in the current work. The rheological properties of SIS/hexadecane were investigated by a rotary rheometer, which revealed the reversible sol‐gel transition during the cooling process as well as the gelation temperature with the SIS concentration above 2%. Owing to the dynamic hexadecane liquid layer and low‐modulus gel surface, the coating displays outstanding sliding properties to various fluids as well as impressive repellence to bacteria. The water sliding angles on OIGs are below 5° as measured by a water contact angle system. Moreover, it can serve as a barrier against corrosion medium and can be in situ repaired by the laser irradiation based on photothermal effect once damaged. The electrochemical impedance spectroscopy indicated the impedance modulus at 0.01 Hz (|Z|0.01Hz) of the OIG coatings on Q235 substrate is 6.34 × 109 Ω cm2, and the repairing process was monitored by the scanning Kelvin probe microscope. This research proposes a novel strategy to prepare the self‐repairing coatings for anti‐adhesion and anti‐corrosion based on the physically cross‐linked oil‐impregnated gel.

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Enduring liquid repellency through slippery ionic liquid-infused organogels

Abstract: Ionic liquid-infused organogel coatings increase temperature- and long-term stabiity of lubricant-infused repellent coatings.

Cited by 11 publications

References 59 publications

From Sticky to Slippery: Self-Functionalizing Lubricants for In Situ Fabrication of Liquid-Infused Surfaces

From Sticky to Slippery: Self-Functionalizing Lubricants for In Situ Fabrication of Liquid-Infused Surfaces

Low friction of superslippery and superlubricity: A review

Self‐repairing oil‐impregnated gel coatings based on reversible physical cross‐linking for anti‐fouling and anti‐corrosion

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