In situ investigation of ice formation on surfaces with representative wettability

Yin, Longwei; Xia, Qiang; Xue, Jian; Yang, Shuqing; Wang, Qingjun; Chen, Qingmin

doi:10.1016/j.apsusc.2010.04.086

Cited by 129 publications

(89 citation statements)

References 26 publications

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“…Under high humidity conditions (RH>80%) and as shown in Figure 3.3c and 3.3d, These trends are substantially different than those of Yin et al, 42 Karmouch et al, 43 He et al 48 and Yin et al 49 who found marked reductions in CA and CAH angles as surface temperature was reduced for both low and high humidity environments.…”

Section: Resultscontrasting

confidence: 50%

“…To understand the differences between the present high humidity results from the cooling cycle and those of Yin et al, 42 Karmouch et al, 43 He et al 48 and Yin et al, 49 an additional experiment was performed. A Peltier cooling stage was set up to investigate the effect of homogeneous versus non-homogeneous thermal conditions on superhydrophobicity.…”

Section: Resultsmentioning

confidence: 99%

“…These experiments generally demonstrated a decrease in CA and CAH as surface temperature decreases. [42][43][44] It has been hypothesized that this effect is due to water condensation on the superhydrophobic surface driven by differences between surface and air temperatures. In particular, it was suggested that condensed microdroplets penetrate into the gaps of the micro and nano-structures, triggering a local transition from Cassie to Wenzel wetting state.…”

Section: Introductionmentioning

confidence: 99%

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Impinging Drops on Superhydrophobic Surfaces at Icing Conditions

Yeong

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Due to their excellent water repellent characteristics, superhydrophobic surfaces have been hypothesized to be icephobic. This is based on the premise that water droplets will be repelled from the surface before ice nucleation can occur. The icephobic nature of these surfaces provides an attractive solution to current icing problems that can occur in aerospace applications. However, significant challenges remain before anti-wetting coatings could be implemented as an effective ice mitigation tool. For example, the majority of current synthetic superhydrophobic surfaces are fragile and unable to withstand the harsh environmental conditions that are encountered by aerospace applications. In addition, their static and dynamic wettability at varying temperatures and humidity, as well as their ice-shedding performance under the impact of a super-cooled icing cloud, are not well understood.Therefore, in this dissertation, fabrication techniques for a previously developed nanocomposite surface were improved so that coatings of consistent antiwetting performance and durability could be produced. The icephobicity of this nanocomposite coating was then systematically investigated. First, an experiment was conducted to study the wettability of a water drop on the coating for a full temperature cycle (20 -3The investigation was then extended to study the impact and rebound dynamics of a iv drop on an inclined coating, at different fluid viscosities and at various temperatures (50°C to -8°C). This was followed by a study of ice adhesion strength of the coatings -cooled water droplets. The receding contact angle was discovered from these experiments to be a key parameter in controlling superhydrophobic wettability and ice adhesion. Therefore, the receding angle depinning dynamics from a superhydrophobic surface were also studied in detail at micron length scales and at microsecond temporal scales. In summary, results from this dissertation revealed the crucial parameters that govern the icing performance of a nanocomposite superhydrophobic surface.

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Section: Resultscontrasting

confidence: 50%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impinging Drops on Superhydrophobic Surfaces at Icing Conditions

Yeong

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“…However, the decrease was more pronounced for superhydrophobic surfaces with higher CAH (Table 2). In fact, when the rough surfaces are exposed to temperatures lower than zero, condensed water penetrates into the porosities of the coating and the water vapour condensation leads to a so-called Cassie-Wenzel regime transition resulting in lower contact angles [21]. This phenomenon seems be more important for surfaces with higher CAH because of the higher water penetration in the rough surface cavities which can increase the surface contact with the supercooled surface.…”

Section: Resultsmentioning

confidence: 97%

“…The clear distinction between the CAH values for the stearic acid coatings alone as compared to those with incorporated CaCO 3 or SiO 2 nanoparticles can be explained in terms of a transition between the Wenzel state (droplet supported on the asperities of the rough surface with air trapped underneath) and the Cassie-Baxter state (liquid penetrates the asperities of the substrate) [20]. The study of the wettability of superhydrophobic surfaces at supercooled temperature is of prime importance for the development of icephobic coatings [21,22]. So, the contact angle measurements of samples were carried out at low temperatures.…”

Section: Resultsmentioning

confidence: 99%

A Simple Method to Create Superhydrophobic Aluminium Surfaces

Jafari

Farzaneh

2012

MSF

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Superhydrophobic surfaces were prepared using a very simple and low-cost method by spray coating. A high static water contact angle of about 154° was obtained by deposition of stearic acid on an aluminium alloy. However, this coating demonstrated a high contact angle hysteresis (~ 30º). On the other hand, superhydrophobic surfaces with a static contact angle of about 162º and 158º, and a low contact angle hysteresis of about 3º and 5º were respectively obtained by incorporating nanoparticles of SiO 2 and CaCO 3 in stearic acid. The excellent resulting hydrophobicity is attributed to the synergistic effects of micro/nanoroughness and low surface energy. A study of the wettability of these surfaces at temperatures ranging from 20 to -10 ºC showed that the superhydrophobic surface becomes rather hydrophobic at supercool temperatures.

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