Projects per year
Abstract / Description of output
Wetting plays a major role in the close interactions between liquids and solid surfaces, which can be tailored by modifying the chemistry as well as the structures of the surface outermost layer. Several methodologies such as chemical vapor deposition, physical vapor deposition, electroplating and chemical reactions, amongst others have been adopted for the alteration/modification of such interactions suitable for various applications. However, the fabrication of low contact line pinning hydrophobic surfaces via simple and easy methods remains an open challenge. In this work, we exploit one-step and multiple-step silicone oil (5 cSt – 100 cSt) grafting on smooth silicon substrates (although the technique is suitable to other substrates) looking closely at the effect of viscosity, as well as the volume fucntion of the deposition method and layers (1 – 5) of the oil grafted. Remarkably, the optimisation grafting of silicone oil fabrication results in non-wetting surfaces with extremely low contact angle hysteresis below 1o and high contact angles of ~108o after a single grafting step, which is an order of magnitude smaller than earlier previous works reporting on silicone oil grafted surfaces. Moreover, the different droplet-surface interactions and pinning behaviour can be additionally tailored to the specific application with contact angle hysteresis ranging from 1o to 20o and sliding angles between 1.5o and 60o (for droplet volumes of 3 μL) depending on the fabrication parameters adopted. In terms of roughness, all the samples (independent of the grafting parameters) showed small changes in root mean square roughness below 20 nm. Last, stability analysis of the grafting method reported here under various conditions shows that the coating is quite stable under mechanical vibrations (ultrasonic bath sonication) and harsh chemical environment (ultrasonication in bath of ethanol); but looses their low pinning characteristics when exposed to a high temperature humid environment (saturated steam at T ~99 oC). Findings presented here provide a basis for selecting the most appropriate and suitable method and parameters for silicone oil grafting aimed at low hysteresis for specific applications.
Original language | English |
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Pages (from-to) | 11281-11295 |
Journal | ACS Applied Materials & Interfaces |
Volume | 15 |
Issue number | 8 |
Early online date | 15 Feb 2023 |
DOIs | |
Publication status | Published - 1 Mar 2023 |
Keywords / Materials (for Non-textual outputs)
- Hydrophobicity
- Silicon Oil Grafting
- Low Contact Angle Hysteresis
- Small/No Contact Line Pinning
- Wettability Tuning
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Dive into the research topics of 'Silicone Oil Grafted Low Hysteresis Water Repellent Surfaces'. Together they form a unique fingerprint.Projects
- 3 Finished
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Convection and Interfacial Mass Exchange
Sefiane, K. & Orejon Mantecon, D.
1/01/20 → 15/09/23
Project: Research
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Convection and Interfacial Mass Exchange (EVAPORATION)
Christy, J., Krueger, T., Reese, J., Sefiane, K. & Valluri, P.
1/10/16 → 30/09/19
Project: Research