Beyond the Wenzel and Cassie–Baxter world: Mathematical insight into contact angles

Vigdorowitsch, Michael; Цыганкова, Л. Е.; Остриков, В. В.; Rodionova, Lyudmila D.

doi:10.1002/mma.8462

Cited by 7 publications

(5 citation statements)

References 55 publications

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“…In other words, because the chemical nature and the surface properties of the nanoparticles differ from that of the polymer substrate, both the chemical heterogeneity and surface roughness must be considered in the final state at equilibrium; thus, in the current situation, the final state can be seen as a combination of the Cassie–Baxter and Wenzel states. In fact, it was recently shown [ 24 ] that, indeed, a transition from the Cassie–Baxter state to a Wenzel state transition produces a continuous spectrum of a linear combination between the two basis states. To prove that the main parameter controlling the wettability observed on the nanostructured side is the surface polarity of the nanoparticles, we treat the surface with hexamethyldisilazane (HMDS), a well-known surface hydrophobizing agent.…”

Section: Discussionmentioning

confidence: 99%

Asymmetrically Nanostructured 2D Janus Films Obtained from Pickering Emulsions Polymerized in a Langmuir–Blodgett Trough

Honciuc¹,

Negru²

2023

Micromachines

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Low-dimensional structures, such as two-dimensional (2D) Janus films, can be useful in studying fundamental interactions or in applications at the nanoscale. In this work, we report the fabrication of 2D polymer Janus films consisting of one smooth and another nanostructured facet on which silica nanoparticles (NPs) are self-assembled in a compact monolayer shield. The 2D films are made from Pickering emulsions of monomers in water, stabilized by NPs, which are spread over the surface of the water in a Langmuir–Blodgett trough. Following the spreading of the colloidosomes, oil droplets stabilized by NPs collapse, and the interfaces reorganize such that the NP monolayer is found exclusively at the oil/water interface. Upon compression followed by UV polymerization, a 2D solid film is formed, with one smooth and another nanostructured face. The film can be removed from the surface of the water and handled with tweezers. The 2D films exhibit different surface properties on the two sides, such as differences in water wettability. On the nanostructured side, water wettability can be tuned by tuning the surface energy of the nanoparticles, namely by changing their surface functional groups. Upon removal of NPs, the surface can be patterned with an array of circular traces.

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Section: Discussionmentioning

confidence: 99%

Asymmetrically Nanostructured 2D Janus Films Obtained from Pickering Emulsions Polymerized in a Langmuir–Blodgett Trough

Honciuc¹,

Negru²

2023

Micromachines

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“…This is the case for surface chemical activation and physical surface roughening that, combined, modify the surface wettability. The Wenzel and Cassie-Baxter models are classic theories used to describe the wettability of a surface, especially in the presence of roughness or textures [232,233] . These models, summarized in Table 5, are often invoked to explain the hydrophilic and hydrophobic behaviors of rough surfaces.…”

Section: Surface Wettability: a Property Resulting From Chemical Acti...mentioning

confidence: 99%

From Basics to Frontiers: A Comprehensive Review of Plasma-Modified and Plasma-Synthesized Polymer Films

Dufour

2023

Polymers

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This comprehensive review begins by tracing the historical development and progress of cold plasma technology as an innovative approach to polymer engineering. The study emphasizes the versatility of cold plasma derived from a variety of sources including low-pressure glow discharges (e.g., radiofrequency capacitively coupled plasmas) and atmospheric pressure plasmas (e.g., dielectric barrier devices, piezoelectric plasmas). It critically examines key operational parameters such as reduced electric field, pressure, discharge type, gas type and flow rate, substrate temperature, gap, and how these variables affect the properties of the synthesized or modified polymers. This review also discusses the application of cold plasma in polymer surface modification, underscoring how changes in surface properties (e.g., wettability, adhesion, biocompatibility) can be achieved by controlling various surface processes (etching, roughening, crosslinking, functionalization, crystallinity). A detailed examination of Plasma-Enhanced Chemical Vapor Deposition (PECVD) reveals its efficacy in producing thin polymeric films from an array of precursors. Yasuda’s models, Rapid Step-Growth Polymerization (RSGP) and Competitive Ablation Polymerization (CAP), are explained as fundamental mechanisms underpinning plasma-assisted deposition and polymerization processes. Then, the wide array of applications of cold plasma technology is explored, from the biomedical field, where it is used in creating smart drug delivery systems and biodegradable polymer implants, to its role in enhancing the performance of membrane-based filtration systems crucial for water purification, gas separation, and energy production. It investigates the potential for improving the properties of bioplastics and the exciting prospects for developing self-healing materials using this technology.

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“…This phenomenon was due to the air voids appearing on the film surface, which was commonly witnessed in previous research. 30,31 Based on the WCA results, the surface solid fraction (SSF) can be calculated following the Cassie–Baxter eqn (1): 32,33 cos θ c = f s (cos θ c + 1) − 1where θ c and θ s are defined as the contact angles of convex and smooth surfaces, and f s is the solid fraction on the film surface. In accordance with the attained WCA values, c -TPU_15 film possesses the lowest SSF of 51.9%.…”

Section: Resultsmentioning

confidence: 99%

Section: Empirical Output Performancementioning

confidence: 99%

Ultra-stretchable and shape-memorable ability of an output-boosted triboelectric nanogenerator utilizing highly ordered microdome-crowning thermoplastic polyurethane for a finger-motion detection sensor

Chau,

Tran,

et al. 2023

Mater. Adv.

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Beyond the Wenzel and Cassie–Baxter world: Mathematical insight into contact angles

Abstract: The famous and still being incessantly cited works published in the first half of the last century by Wenzel 1 and by Cassie and Baxter 2 represent an unprecedented case related to quite tangible phenomena around us. These publications

Cited by 7 publications

References 55 publications

Asymmetrically Nanostructured 2D Janus Films Obtained from Pickering Emulsions Polymerized in a Langmuir–Blodgett Trough

Asymmetrically Nanostructured 2D Janus Films Obtained from Pickering Emulsions Polymerized in a Langmuir–Blodgett Trough

From Basics to Frontiers: A Comprehensive Review of Plasma-Modified and Plasma-Synthesized Polymer Films

Ultra-stretchable and shape-memorable ability of an output-boosted triboelectric nanogenerator utilizing highly ordered microdome-crowning thermoplastic polyurethane for a finger-motion detection sensor

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