Designing non-textured, all-solid, slippery hydrophilic surfaces

Vahabi, Hamed; Vallabhuneni, Sravanthi; Hedayati, Mohammadhasan; Wang, Wei; Krapf, Diego; Kipper, Matt J.; Miljkovic, Nenad; Kota, Arun K.

doi:10.1016/j.matt.2022.09.024

Cited by 23 publications

(10 citation statements)

References 47 publications

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“…However, this concept has not been central to contemporary understanding of SCALS behaviour. Recently, Σ has been reinvented and applied to a PEO SCALS system by Vahabi et al., [41] who term it the “nondimensional slipperiness factor”. Our recent neutron reflectometry characterization of these PEO SCALS found their structure to be consistent with that of true monolayers (i.e., no silane cross‐linking) [42] .…”

Section: Resultsmentioning

confidence: 99%

Nanostructure Explains the Behavior of Slippery Covalently Attached Liquid Surfaces

Gresham,

Lilley,

Nelson

et al. 2023

Angew Chem Int Ed

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Slippery covalently‐attached liquid surfaces (SCALS) with low contact angle hysteresis (CAH, <5◦) and nanoscale thickness display impressive anti‐adhesive properties, similar to lubricant‐infused surfaces. Their efficacy is generally attributed to the liquid‐like mobility of the constituent tethered chains. However, the precise physico‐chemical properties that facilitate this mobility are unknown, hindering rational design. This work quantifies the chain length, grafting density, and microviscosity of a range of polydimethylsiloxane (PDMS) SCALS, elucidating the nanostructure responsible for their properties. Three prominent methods are used to produce SCALS, with characterization carried out via single‐molecule force measurements, neutron reflectometry, and fluorescence correlation spectroscopy. CO2 snow‐jet cleaning was also shown to reduce the CAH of SCALS via a modification of their grafting density. SCALS behavior can be predicted by reduced grafting density, Σ, with the lowest water CAH achieved at Σ ≈ 2. This study provides the first direct examination of SCALS grafting density, chain length, and microviscosity and supports the hypothesis that SCALS properties stem from a balance of layer uniformity and mobility.

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Section: Resultsmentioning

confidence: 99%

Nanostructure Explains the Behavior of Slippery Covalently Attached Liquid Surfaces

Gresham,

Lilley,

Nelson

et al. 2023

Angew Chem Int Ed

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“…To begin with, we chose silicon wafers (R rms = 1.4 ± 0.5 nm) as our non-textured substrates because they display low surface roughness, and they can be easily modified via silanization to impart non-polar surface chemistry. 24 We modified the surface chemistry of silicon wafers by covalently attaching hydrocarbon brushes (with octadecyltrichlorosilane, OTS, thickness ≈ 1 nm) or fluorocarbon brushes (with heptadecafluoro-1,1,2,2-tetrahydrodecyl trichlorosilane, FDTS, thickness ≈ 1 nm) via liquid phase silanization; the surface roughness R rms of silicon wafers did not change significantly upon surface modification with OTS or FDTS (see Supporting Information, Section S1). We chose two different non-polar surface chemistries to investigate because we anticipate that the differences in chain flexibility of hydrocarbon and fluorocarbon brushes will influence the mobility of droplets, 22,25 which plays a critical role in designing our fuel adulteration detection device.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…To systematically design a fuel adulteration detection device, we first studied the mobility of droplets on non-textured (i.e., smooth) substrates with different non-polar (hydrocarbon and fluorocarbon) chemistries. To begin with, we chose silicon wafers ( R rms = 1.4 ± 0.5 nm) as our non-textured substrates because they display low surface roughness, and they can be easily modified via silanization to impart non-polar surface chemistry . We modified the surface chemistry of silicon wafers by covalently attaching hydrocarbon brushes (with octadecyltrichlorosilane, OTS, thickness ≈ 1 nm) or fluorocarbon brushes (with heptadecafluoro-1,1,2,2-tetrahydrodecyl trichlorosilane, FDTS, thickness ≈ 1 nm) via liquid phase silanization; the surface roughness R rms of silicon wafers did not change significantly upon surface modification with OTS or FDTS (see Supporting Information, Section S1).…”

Section: Resultsmentioning

confidence: 99%

Rapid and Onsite Detection of Fuel Adulteration

et al. 2023

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In numerous developing countries, the lower cost of subsidized liquid fuels such as kerosene compared to market-rate fuels often results in fuel adulteration. Such misuse of kerosene is hard to detect with conventional detection technologies because they are either time consuming, expensive, not sensitive enough or require well-equipped analytical laboratories. In this work, we developed an inexpensive and easy-to-use device for rapid and onsite detection of fuel adulteration. The working principle of our fuel adulteration detection is sensing changes in the mobility of fuel droplets on non-textured (i.e., smooth) and non-polar solid surfaces. Using our device, we demonstrated rapid detection of diesel (market-rate fuel) adulterated with kerosene (subsidized fuel) at concentrations an order of magnitude below typical adulteration concentrations. We envision that our inexpensive, easy-to-use, and field-deployable device as well as the design strategy will pave the way for novel fuel quality sensors.

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“…Herein, we report an ice-inspired polymeric slippery surface (II-PSS) on the basis of densely surface-grafted polymer chains (i.e., brush-like polymer matrix), − which could serve as a supporting layer to stabilize the lubricating molecules via dynamic dipole–dipole interactions . The strong and dynamic interactions between polymer chains and lubricating molecules have been demonstrated by molecular dynamics simulations, which generate a superlubricated Q-LL on solid substrates and, thus, nicely mimic the functions of the ice surface.…”

Section: Introductionmentioning

confidence: 99%

Ice-Inspired Polymeric Slippery Surface with Excellent Smoothness, Stability, and Antifouling Properties

Tan

Hao

et al. 2023

ACS Appl. Mater. Interfaces

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Ice is omnipresent in our daily life and possesses intrinsic slipperiness as a result of the formation of a quasi-liquid layer. Thus, the functional surfaces inspired by ice show great prospects in widespread fields from surface lubrication to antifouling coatings. Herein, we report an ice-inspired polymeric slippery surface (II-PSS) constructed by a self-lubricating liquid layer and a densely surface-grafted polymer brush. The polymer brush layer could act as a homogeneous matrix to capture lubricant molecules via strong and dynamic dipole−dipole interactions to form a stable quasi-liquid layer that resembles the ice surface. The II-PSS can be easily fabricated on various solid substrates (e.g., silicon, glass, aluminum oxide, plastics, etc.) with excellent smoothness (roughness of ∼0.4 nm), optical transmittance (∼94.5%), as well as repellence toward diverse liquids with different surface tensions (22.3−72.8 mN m −1 ), pH values (1−14), salinity, and organic pollutants. Further investigation shows that the II-PSS exhibits extremely low attachment for proteins and marine organisms (e.g., algae and mussels) for over one month. These results demonstrate a robust and promising strategy for high-performance antifouling coatings.

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Designing non-textured, all-solid, slippery hydrophilic surfaces

Cited by 23 publications

References 47 publications

Nanostructure Explains the Behavior of Slippery Covalently Attached Liquid Surfaces

Nanostructure Explains the Behavior of Slippery Covalently Attached Liquid Surfaces

Rapid and Onsite Detection of Fuel Adulteration

Ice-Inspired Polymeric Slippery Surface with Excellent Smoothness, Stability, and Antifouling Properties

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