Anisotropic wetting characteristics versus roughness on machined surfaces of hydrophilic and hydrophobic materials

Liang, Yande; Shu, Liming; Natsu, Wataru; He, Fang

doi:10.1016/j.apsusc.2014.12.071

Cited by 48 publications

(34 citation statements)

References 39 publications

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“…Equation (14) has been compared with both numerical and experimental results 7,18 showing reasonable agreement. However the simplified model is affected by significant shortcomings: firstly Eqn.…”

Section: Accuracy Of Chemical Stripe Modelmentioning

confidence: 85%

Shape Evolution of Droplets Growing on Linear Microgrooves

et al. 2018

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Anisotropic spreading of liquids and elongated droplet shapes are often encountered on surfaces decorated with a periodic micropattern of linear surface topographies. Numerical calculations and wetting experiments show that the shape evolution of droplets that are slowly growing on a surface with parallel grooves can be grouped into two distinct morphological regimes. In the first regime, the liquid of the growing droplet spreads only into the direction parallel to the grooves. In the second regime, the three-phase contact line advances also perpendicular to the grooves, whereas the growing droplets approach a scale-invariant shape. Here, we demonstrate that shapes of droplets in contact with a large number of linear grooves are identical to the shapes of droplets confined to a plane chemical stripe, where this mapping of shapes is solely based on the knowledge of the cross section of the linear grooves and the material contact angle. The spectrum of interfacial shapes on the chemical stripe can be exploited to predict the particular growth mode and the asymptotic value of the base eccentricity in the limit of droplets covering a large number of grooves. The proposed model shows an excellent agreement with experimentally observed base eccentricities for droplets on grooves of various cross sections. The universality of the model is underlined by the accurate match with available literature data for droplet eccentricities on parallel chemical stripes.

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Section: Accuracy Of Chemical Stripe Modelmentioning

confidence: 85%

Shape Evolution of Droplets Growing on Linear Microgrooves

et al. 2018

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“…Laser texturing techniques can be used to induce a large variety of topographies in terms of the distribution and geometry of the irradiated pattern being the most common linear, circular and pulses array distributions [13,16,19,21]. Due to this fact, it is known that the geometrical and dimensional characteristics of the generated structures have a direct influence with the contact angle between the liquid and solid phases, resulting in higher or lower water retention capability [13,19,[22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Assessment the Sliding Wear Behavior of Laser Microtexturing Ti6Al4V under Wet Conditions

et al. 2019

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Laser micro-texturing processes, compared to untreated surfaces, can improve the friction, wear and wettability behavior of sliding parts. This improvement is related to the micro-geometry and the dimensions of the texture which is also dependent on the processing parameters. This research studied the effect of laser textured surfaces on the tribological behavior of titanium alloy Ti6Al4V. The influence of processing parameters was analyzed by changing the scanning speed of the beam and the energy density of pulse. First, the characterization of dimensional and geometrical features of the texturized tracks was carried out. Later, their influence on the wetting behavior was also evaluated through contact angle measurements using water as a contact fluid. Then, the tribological performance of these surfaces was analyzed using a ball-on-flat reciprocating tribometer under wet and dry conditions. Finally, wear mechanisms were identified employing electronic and optical microscopy techniques capable to evaluate the wear tracks on Ti surfaces and WC–Co spheres. These analyses had determined a strong dependence between the wear behavior and the laser patterning parameters. Wear friction effects were reduced by up to a 70% replacing conventional untreated surfaces of Ti6Al4V alloy with laser textured surfaces.

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“…In the aeronautical and aerospace industry, the decrease of microdroplets on the surface of assembled components can reduce corrosive effects in environments associated with high relative humidity. On the other hand, the liquid absorption capacity allows adaptations to the wear properties of a surface under friction conditions when lubricants or cooling products are used [1,3,[7][8][9][10]. Furthermore, the ability to maintain control over the wetting properties of a surface can produce benefits regarding the biocompatibility and biomechanical behavior of materials in relation to its cellular adhesion, or improving the sliding features under biological fluids situations in medical prostheses [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of Laser Microtexturing on the Wetting Behavior of Ti6Al4V Alloy

Salguero

Mayuet³

et al. 2018

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Surface modification procedures by laser techniques allow the generation of specific topographies and microstructures that enable the adaptation of the external layers of materials for specific applications. In laser texturing processes, it is possible to maintain control over the microgeometry and dimensions of the surface pattern through varying the processing parameters. One of the main areas of interest in the field of surface modification treatments is the ability to generate topographies that are associated with specific surface finishes, in terms of roughness, that can improve the manufactured part's functional capabilities. In this aspect, several types of phenomena have been detected, such as the friction and sliding wear behavior or wetting capacity, which maintain a high dependence on surface roughness. In this research, surface texturing treatments have been developed by laser techniques through using the scanning speed of the beam (V s) as a control parameter in order to generate samples that have topographies with different natures. Through assessments of surface finish using specialized techniques, the dimensional and geometrical features of the texturized tracks have been characterized, analyzing their influence on the wetting behavior of the irradiated layer. In this way, more defined texturing grooves has been developed by increasing the V s , which also improves the hydrophobic characteristics of the treated surface. However, due to the lack of uniformity in the solidification process of the irradiated area, some deviations from the expected trends and singular points can be observed. Using the contact angle method to evaluate the wetting behavior of the applied treatments found increases in the contact angle values for high texturing speeds, finding a maximum value of 65.59 • for V s = 200 mm/s.

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Anisotropic wetting characteristics versus roughness on machined surfaces of hydrophilic and hydrophobic materials

Cited by 48 publications

References 39 publications

Shape Evolution of Droplets Growing on Linear Microgrooves

Shape Evolution of Droplets Growing on Linear Microgrooves

Assessment the Sliding Wear Behavior of Laser Microtexturing Ti6Al4V under Wet Conditions

Effects of Laser Microtexturing on the Wetting Behavior of Ti6Al4V Alloy

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