Nanosecond laser micro- and nanotexturing for the design of a superhydrophobic coating robust against long-term contact with water, cavitation, and abrasion

Aim: To study the short-and long-term results of 2RT nanosecond laser treatment for CSC. To compare clinical results with those with AntiVEGF. Methods: Nanosecond laser (2RT, Ellex) was used. Patients were followed by BCVA, FAF, OCT, Angio-OCT. Results: 90% of the patient treated with 2RT had improvement of visual acuity and contrast sensitivity. 19 % [1] patients showed no improvement. 81% of the 2RT treated patients had total resorbtion of subretinal fluid against 60% treated with AntiVEGF. Functional results correlated with the atrophy of RPE in the macula. 46% (19 patients) had resolution on the first month, 23% [2]-on the third and 12% [3]-on the sixth month. The time of resolution shows no relation to the baseline pigment epithelial atrophy. Four patients presented with a recurrency of the disease in the follow-up period. 19% [1] were non responders. 60% of AntiVEGF treated eyes were responders and 40% were non responders. Those who responded to treatment needed between 3 and 10 injections. Conclusion: 2 RT is a non-invasive treatment modality with no adverse effects and high success rates.

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Long-Term Influence of Laser-Processing Parameters on (Super)hydrophobicity Development and Stability of Stainless-Steel Surfaces

Materials ◽

10.3390/ma11112240 ◽

2018 ◽

Vol 11 (11) ◽

pp. 2240 ◽

Cited By ~ 23

Author(s):

Peter Gregorčič ◽

Marjetka Conradi ◽

Luka Hribar ◽

Matej Hočevar

Keyword(s):

Contact Angle ◽

Stainless Steel ◽

Processing Parameters ◽

Nanosecond Laser ◽

Stainless Steel Surface ◽

Textured Surfaces ◽

Laser Texturing ◽

Important Challenge ◽

Faster Development

Controlling the surface wettability represents an important challenge in the field of surface functionalization. Here, the wettability of a stainless-steel surface is modified by 30-ns pulses of a Nd:YAG marking laser (λ = 1064 nm) with peak fluences within the range 3.3–25.1 J cm−2. The short- (40 days), intermediate- (100 days) and long-term (1 year) superhydrophilic-to-(super)hydrophobic transition of the laser-textured surfaces exposed to the atmospheric air is examined by evaluating its wettability in the context of the following parameters: (i) pulse fluence; (ii) scan line separation; (iii) focal position and (iv) wetting period due to contact angle measurements. The results show that using solely a short-term evaluation can lead to wrong conclusions and that the faster development of the hydrophobicity immediately after laser texturing usually leads to lower final contact angle and vice versa, the slower this transition is, the more superhydrophobic the surface is expected to become (possibly even with self-cleaning ability). Depending on laser fluence, the laser-textured surfaces can develop stable or unstable hydrophobicity. Stable hydrophobicity is achieved, if the threshold fluence of 12 J cm−2 is exceeded. We show that by nanosecond-laser texturing a lotus-leaf-like surface with a contact angle above 150° and roll-off angle below 5° can be achieved.

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Environmental stimuli-responsive self-repairing waterbased superhydrophobic coatings

RSC Advances ◽

10.1039/c6ra25135h ◽

2017 ◽

Vol 7 (1) ◽

pp. 543-550 ◽

Cited By ~ 25

Author(s):

Kunlin Chen ◽

Kun Gu ◽

Siyu Qiang ◽

Chaoxia Wang

Keyword(s):

Mechanical Damage ◽

Superhydrophobic Coating ◽

Stimuli Responsive ◽

Environmental Stimuli ◽

Superhydrophobic Coatings

A waterbased self-repairing superhydrophobic coating shows a self-repairing ability after mechanical damage or contamination with organics, and thus long-term outdoor durability.

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Synthesis of ceria based superhydrophobic coating on Ni20Cr substrate via cathodic electrodeposition

Physical Chemistry Chemical Physics ◽

10.1039/c5cp04723d ◽

2015 ◽

Vol 17 (47) ◽

pp. 31750-31757 ◽

Cited By ~ 20

Author(s):

F. Pedraza ◽

S. A. Mahadik ◽

B. Bouchaud

Keyword(s):

Surface Relaxation ◽

Superhydrophobic Coating ◽

Cathodic Electrodeposition

In this woks, we present designing strategy for superhydrophobic ceria coating on a Ni20Cr substrate is obtained by combination of electropolishing process, cathodic electrodeposition and subsequent long-term UVH surface relaxation.

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