Droplet condensation on polymer surfaces: A review

UÇAR, İKRİME ORKAN

doi:10.3906/kim-1303-26

Cited by 9 publications

(5 citation statements)

References 149 publications

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“…This value is comparable to that measured on an LDPE surface (151 • ) at a solvent evaporation temperature of 30 • C, 24 but slightly lower than that reported on isotactile polypropylene (155 • , drying temperature of 30 • C) 27 and higher than on HDPE/xylene dried at 20 • C (142 • ) . 25 Intercalation of organoclay in the polymer matrix led to an increase in the contact angle to about 160 • with a decrease in the hysteresis to 7 • .…”

Section: Introductionsupporting

confidence: 75%

The multiple effects of organoclay and solvent evaporation on hydrophobicity of composite surfaces

Yolcu¹,

Gürses²,

Boukherroub³

2017

Turk J Chem

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Abstract:A superhydrophobic high-density polyethylene (HDPE)/organoclay composite material with a water-static contact angle of ∼ 162• and low hysteresis (7 • ) was prepared by a simple solution-intercalation technique. This onestep method consists of the insertion of organoclay, produced through cation exchange with cetyltrimethylammonium bromide (CTAB), in the polymer matrix at 120• C in xylene. In this process, evaporation of the solvent and organoclay amount are key factors for the achievement of superhydrophobicity. We characterized composite material with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and contact angle measurements. The characterizations showed that the organoclay provides a place for the formation of small polymer aggregates and facilitates the evaporation of the organic solvent. The technique described here is simple and does not require any complicated process.

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Section: Introductionsupporting

confidence: 75%

The multiple effects of organoclay and solvent evaporation on hydrophobicity of composite surfaces

Yolcu¹,

Gürses²,

Boukherroub³

2017

Turk J Chem

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“…After DH exposure of the coatings, round features associated with blisters, surface damage, and material loss were observed (Figure 13a,b). These might be related to the continuous condensation and evaporation of water drops from the surface, by interacting with the porous coating resulting in solvolitic or hydrolytic degradation [24]. thickness of a spray-coated hydrophobic coating B, reduced from 3.7 µm for the as-deposited material, to 2 µm after 1000 h of DH exposure.…”

Section: Degradation Mode: Thinning Of the Coatingmentioning

confidence: 99%

Degradation of Hydrophobic, Anti-Soiling Coatings for Solar Module Cover Glass

et al. 2020

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Soiling of solar module cover glass is a serious problem for solar asset managers. It causes a reduction in power output due to attenuation of the incident light, and reduces the return on investment. Regular cleaning is required to mitigate the effect but this is a costly procedure. The application of transparent hydrophobic, anti-soiling coatings to the cover glass is a promising solution. These coatings have low surface energy and contaminants do not adhere well. Even if soiling does remain on the coated surface, it is much more easily removed during cleaning. The performance of the coatings is determined using the water contact angle and roll-off angle measurements. However, although hydrophobic coatings hold out great promise, outdoor testing revealed degradation that occurs surprisingly quickly. In this study, we report on results using laboratory-based damp heat and UV exposure environmental tests. We used SEM surface imaging and XPS surface chemical analysis to study the mechanisms that lead to coating degradation. Loss of surface fluorine from the coatings was observed and this appeared to be a major issue. Loss of nanoparticles was also observed. Blistering of surfaces also occurs, leading to loss of coating material. This was probably due to the movement of retained solvents and was caused by insufficient curing. This mechanism is avoidable if care is taken for providing and carrying out carefully specified curing conditions. All these symptoms correlate well with observations taken from parallel outdoor testing. Identification of the mechanisms involved will inform the development of more durable anti-soiling, hydrophobic coatings for solar application.

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“…For example, antifouling biomaterials require less hydrophobic surfaces, biomimetic self-cleaning surfaces require more hydrophobic surfaces, and water harvesting may use materials that have specific hydrophilic–hydrophobic patterned surfaces . In these and other applications, polymeric materials are an attractive platform for potentially tailoring surface hydrophobicity, owing to a large chemical space, amenability to a variety of surface treatments, and biointerfacing or biomimetic potential. ,,, Methods to predict, characterize, and understand the hydrophobic behavior of polymers would thus have broad utility.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Investigation of Nanoscale Hydrophobicity of Polymer Surfaces: What Makes Water Wet?

2023

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The wettability of a polymer surface�related to its hydrophobicity or tendency to repel water�can be crucial for determining its utility, such as for a coating or a purification membrane. While wettability is commonly associated with the macroscopic measurement of a contact angle between surface, water, and air, the molecular physics that underlie these macroscopic observations are not fully known, and anticipating the relative behavior of different polymers is challenging. To address this gap in molecular-level understanding, we use molecular dynamics simulations to investigate and contrast interactions of water with six chemically distinct polymers: polytetrafluoroethylene, polyethylene, polyvinyl chloride, poly(methyl methacrylate), Nylon-66, and poly(vinyl alcohol). We show that several prospective quantitative metrics for hydrophobicity agree well with experimental contact angles. Moreover, the behavior of water in proximity to these polymer surfaces can be distinguished with analysis of interfacial water dynamics, extent of hydrogen bonding, and molecular orientation�even when macroscopic measures of hydrophobicity are similar. The predominant factor dictating wettability is found to be the extent of hydrogen bonding between polymer and water, but the precise manifestation of hydrogen bonding and its impact on surface water structure varies. In the absence of hydrogen bonding, other molecular interactions and polymer mechanics control hydrophobic ordering. These results provide new insights into how polymer chemistry specifically impacts water−polymer interactions and translates to surface hydrophobicity. Such factors may facilitate the design or processing of polymer surfaces to achieve targeted wetting behavior, and presented analyses can be useful in studying the interfacial physics of other systems.

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Droplet condensation on polymer surfaces: A review

Cited by 9 publications

References 149 publications

The multiple effects of organoclay and solvent evaporation on hydrophobicity of composite surfaces

The multiple effects of organoclay and solvent evaporation on hydrophobicity of composite surfaces

Degradation of Hydrophobic, Anti-Soiling Coatings for Solar Module Cover Glass

Molecular Dynamics Investigation of Nanoscale Hydrophobicity of Polymer Surfaces: What Makes Water Wet?

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