Transition from superhydrophilic to superhydrophobic state of laser textured stainless steel surface and its effect on corrosion resistance

Trdan, Uroš; Hočevar, Matej; Gregorčič, Peter

doi:10.1016/j.corsci.2017.04.005

Cited by 184 publications

(119 citation statements)

References 39 publications

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“…We performed the boiling experiments one week after texturing; at that time, the static contact angle was less than 39°. However, it was shown [8,[27][28][29] that in the case of surfaces covered by multi-scale -cavities, the boiling performance does not (strongly) depend on wettability because the wettability just shifts the required range of the -cavities' diameters [15]. This was also the primary reason that we decided to produce the active nucleation sites by using the described laser-texturing method.…”

Section: Surface Characterizationmentioning

confidence: 99%

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Voglar

Gregorčič

Zupančič

et al. 2018

International Journal of Heat and Mass Transfer

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This investigation used laser-processed 25-μm-thick stainless steel foils as heaters in pool boiling experiments under subcooled and saturated conditions at atmospheric pressure. Boling surfaces were modified by a nanosecond fiber laser. In most cases, laser-textured parts on boiling surfaces were spaced apart by a capillary length of water (2.5 mm) and had different shapes and arrangements. Multi-scale micro-cavities (with diameters ranging from 0.2 to 10 μm) on the laser-textured areas of the surfaces provided potential active nucleation sites. The highest heat flux measured before the burnout was observed on the fully treated sample; this heat flux was a factor of 3.7 greater than that of the untreated sample. The sample with hexagonally arranged textured circular shapes with a diameter of 2.0 mm provided a more than 4-fold higher heat transfer coefficient compared to the untreated sample. All of the laser-textured boiling surfaces showed enhanced pool boiling heat transfer performance in comparison to the untreated surface. The optimal spacing between the laser-textured regions was experimentally found to be equal to the capillary length of the working fluid. Our results demonstrate that laser texturing has strong potential for producing patterned surfaces for engineering applications of boiling heat transfer.

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Section: Surface Characterizationmentioning

confidence: 99%

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Voglar

Gregorčič

Zupančič

et al. 2018

International Journal of Heat and Mass Transfer

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“…In recent years, superhydrophobic surfaces inspired by lotus leaf have fascinated many scientists because of their special properties such as antiicing, antiadhesion, corrosion resistance, and drag‐reduction. [ 12–18 ] Spherical water droplet phenomenon originated from the balanced surface tension is one of the typical features of superhydrophobic surfaces. If there is a superhydrophilic pore on superhydrophobic plate, the water droplet put on the pore area will bear an unbalanced surface tension, which may extrude a water jet through the pore of the plate on water surface.…”

Section: Introductionmentioning

confidence: 99%

Droplet‐Based Self‐Propelled Miniboat

Song

Guan

Pan

et al. 2020

Adv Funct Materials

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Self-propelled autonomous devices have huge application prospects in the field of environmental protection and energy. Nonetheless, the requirement of special chemicals or external electric and thermal energy limits their practical application. Here, a green self-propelling method based on Laplace pressure originated from water droplets is reported. First, a triangle-shaped miniboat composed of a superhydrophobic plate with an inclined superhydrophilic pore is fabricated. Water droplets put on superhydrophilic pore pass through the pore and form a jellyfishlike jet, which further propels the miniboat to move spontaneously and directionally. The propelling distance, propelling time, and instantaneous propelling velocity of the miniboat is greatly affected by the pore size and the initial water droplet volume. Then, two types of devices are designed and installed on the miniboat to successively provide small water droplets from the reservoir or rain to realize the continuous and long-distance self-propelled motion. Moreover, a spindle-shaped miniboat with two or four symmetrical and inclined pores is designed. Under propelling by the torque, the spontaneous and continuous rotation motion is also achieved. This finding will open a new avenue for a wide range of applications ranging from a detecting minirobot on the water surface to a power generation device from rain.

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“…Their surfaces were modified by (DLT) with a nanosecond fiber laser. Several recent studies [3,4,5] have shown that DLT can be used for surface functionalization, since it influences on surface topography and also on surface wettability -immediately after DLT, the textured surfaces become superhydrophilic and after some time the transition to superhydrophobic state may occurs.…”

Section: Introductionmentioning

confidence: 99%

Cavitation Dynamics on Laser-Textured Surfaces

Petkovšek¹,

Hočevar²,

Gregorčič³

2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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This study examines hydrodynamic cavitation behavior on laser-textured surfaces. Cavitation dynamics was investigated on stainless steel cylinders with 10 mm in diameter. Their surfaces were modified by direct laser texturing (DLT) with a nanosecond fiber laser (wavelength of 1060 nm). A highly-polished cylinder was used as a reference. Cavitation characteristics behind circular cylinders were monitored simultaneously by high-speed visualization and high frequency pressure transducer. Comparison at similar cavitation numbers proves, that cavitation characteristics differ significantly between different micro-structured surfaces. In some cases, cavitation extent decrease in comparison with reference -a highly polished cylinder.

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Transition from superhydrophilic to superhydrophobic state of laser textured stainless steel surface and its effect on corrosion resistance

Cited by 184 publications

References 39 publications

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Droplet‐Based Self‐Propelled Miniboat

Cavitation Dynamics on Laser-Textured Surfaces

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