Impact of Viscous Droplets on Superamphiphobic Surfaces

Zhao, Binyu; Wang, Xiang; Zhang, Kai; Chen, Longquan; Deng, Xu

doi:10.1021/acs.langmuir.6b03862

Cited by 80 publications

(59 citation statements)

References 60 publications

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“…Additionally, we found that the maximum spreading area of glycerin A max−g / A 0−g can also be described by a power law of

A_{max - g} / A_{0 - g} \approx v^{β}

. For a single‐phase glycerin drop, the exponent β ≈ 0.5 is observed in Figure d, which is consistent with the previous report . However, for the glycerin part of the Janus drop, β < 0.5, and

β (μ_{h} / μ_{l} : 1491) \approx 0.25 < β (μ_{h} / μ_{l} : 545) \approx 0.34 < β (μ_{h} / μ_{l} : 112) \approx 0.4

.…”

supporting

confidence: 90%

Prompting Splash Impact on Superamphiphobic Surfaces by Imposing a Viscous Part

Lin

Yang

et al. 2020

Advanced Science

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It is widely acknowledged that splash impact can be suppressed by increasing the viscosity of the impinging drop. In this work, however, by imposing a highly viscous drop to a low‐viscosity drop, it is demonstrated that the splash of the low‐viscosity part of this Janus drop on superamphiphobic surfaces can be significantly promoted. The underlying mechanism is that the viscous stress exerted by the low‐viscosity component drives the viscous component moving in the opposite direction, enhancing the spreading of the low‐viscosity side and thereby its rim instability. The threshold velocity, above which splashing occurs, can be tuned by varying the viscosity ratio of the Janus drop. Moreover, the impact of the Janus drop can be employed to verify the mechanism of splash.

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“…Additionally, we found that the maximum spreading area of glycerin A max−g / A 0−g can also be described by a power law of

A_{max - g} / A_{0 - g} \approx v^{β}

. For a single‐phase glycerin drop, the exponent β ≈ 0.5 is observed in Figure d, which is consistent with the previous report . However, for the glycerin part of the Janus drop, β < 0.5, and

β (μ_{h} / μ_{l} : 1491) \approx 0.25 < β (μ_{h} / μ_{l} : 545) \approx 0.34 < β (μ_{h} / μ_{l} : 112) \approx 0.4

.…”

supporting

confidence: 90%

Prompting Splash Impact on Superamphiphobic Surfaces by Imposing a Viscous Part

Lin

Yang

et al. 2020

Advanced Science

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“…In Figure 10a, there is not much difference between the different models. The model of Zhao et al [21] agrees well with the experimental data for a homogeneous superhydrophobic surface.…”

Section: Of 14supporting

confidence: 72%

“…For distilled water on the silicon surface θ Y = 68 • , the maximum spreading factor can be calculated from the model of Pasandideh-Fard et al [20] and Zhao et al [21]. The resolutions are shown in Table 2.…”

Section: Of 14mentioning

confidence: 99%

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Spreading Dynamics of Droplet Impact on a Wedge-Patterned Biphilic Surface

Yang

Chen²,

Huang³

2019

Applied Sciences

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The influence of apex angle and tilting angle on droplet spreading dynamics after impinging on wedge-patterned biphilic surface has been experimentally investigated. Once the droplet contacts the wedge-patterned biphilic surface, it spreads radially on the surface, with a tendency toward a more hydrophilic area. After reaching the maximum spreading diameter, the droplet contracts back. From the experimental results, the normalized diameter β ( β = D / D 0 ) was found to be related with the Weber number ( W e = ρ D V 2 / γ ) as β max ∼ W e 1 / 5 . during the first spreading process. Below 67.4°, a larger apex angle can help a droplet to spread on the surface more quickly. The maximum spreading diameter has a tendency to increase with the Weber number, and then decrease after the Weber number, beyond 2.7. Approximately, the critical Weber number is about 5, when the droplet lifts off the surface. Considering the effect of apex angle, the maximum normalized spreading diameter has a rough expression as β ∼ α τ

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“…Droplet evaporation characteristics depend on surface wettability, contact angle hysteresis (CAH), [14] and surface roughness [15]. There are many ways to measure the surface wettability on substrates such as contact angle measurements, microscopic examination, glass slide method and nuclear magnetic resonance.…”

Section: Drying Droplets Phenomenon On the Substratementioning

confidence: 99%

Drying Droplets: A Review on its Numerical and Experimental Studies to Remove Coffee Ring Effect

Ying¹,

Ngali²,

Azmi³

et al. 2020

ARFMTS

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It is widely known that significant rejection percentage of substrates in the hard disk manufacturing industry is due to the stain appeared during drying of cleaning solution after platting process. Comparison of the characteristics and the causes of these stains suggested that the study of coffee ring effect (CRE) and droplets analysis are needed before any further analysis is carried out. In this review on CRE and droplets, both numerical and experimental works were critically analyzed. Previous studies have highlighted that the drying process of the water droplets are affected by the properties of the water droplets, substrate and temperature. Manipulation of Constant Contact Angle, Constant Contact Radius, advanced contact angle and receding contact angle by varying the arrangement of the substrates and the position of the drying equipment is required to attain the optimum setup to eliminate CRE. Furthermore, manipulation of the temperature of the substrates can enhance the drying process of the droplets before the formation of CRE but the process must not change the properties of the substrates. CRE formation also depends on the properties of the substrates and water droplets. Changing the chemical properties substrates are not advisable to eliminate CRE due to its complex design of the substrates for data storing. All the numerical tests have to be performed according to correct procedures to ensure accurate and acceptance by the industries. Verified and validated results from the evaluation will help to accurately predict the real consequences for further optimization. Knowing that the formation of CRE is caused by the evaporating of the water droplets, we need to find ways to eliminate the formation of water droplets before the heating process, in order to eliminate CRE.

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Impact of Viscous Droplets on Superamphiphobic Surfaces

Cited by 80 publications

References 60 publications

Prompting Splash Impact on Superamphiphobic Surfaces by Imposing a Viscous Part

Prompting Splash Impact on Superamphiphobic Surfaces by Imposing a Viscous Part

Spreading Dynamics of Droplet Impact on a Wedge-Patterned Biphilic Surface

Drying Droplets: A Review on its Numerical and Experimental Studies to Remove Coffee Ring Effect

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