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Rapid laser fabrication of long-term stable superhydrophilic aluminum surface
摘要： A simple method for fabricating stable superhydrophilic aluminum surface is reported in this paper. Controllable micro-nanostructures were prepared on the surface of aluminum plate by nanosecond laser and then soaked in boiled 45% ethanol solution for 2 h as the post-treatment. It is demonstrated that the laser-ablated aluminum plate surface is hydrophilic and then switch to superhydrophilic after a 45% ethanol solution post-treatment. The treated superhydrophilic structure has good hydrophilic stability in a certain period of time. The mechanism of superhydrophilic behavior of aluminum surface treated with laser and ethanol solution was discussed. A new method for preparing stable superhydrophilic surface is proposed in this paper, which is of great significance for the preparation of superhydrophilic surface and the application of superhydrophilic surface in industrial production.
关键词： Superhydrophilic surface,Ethanol solution,Nanosecond laser,Aluminum,Contact angle
更新于2025-09-23 15:21:01
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Development of Thick Superhydrophilic TiO <sub/>2</sub> –ZrO <sub/>2</sub> Transparent Coatings Realized through the Inclusion of Poly(methyl methacrylate) and Pluronic-F127
摘要： A thick coating of hierarchically porous double-templated TiO2?ZrO2?PMMA?PF127 with excellent self-cleaning properties and high transmittance has been developed for the first time on glass substrates using a simple dip-coating technique. Comparative studies of this sample with a thick and transparent coating of single-templated TiO2?ZrO2?PMMA have been performed to probe the origin of its exceptional properties. The formation of the composites, successful incorporation of the polymer into the matrix, and the porous nature of the films have been studied. The presence of Ti2+ in the double-templated samples has been confirmed, which suggest the chemisorption of water on the surface of the film. The variation in the self-cleaning properties of the samples on UV-illumination has also been studied. The double-templated film is found to possess the capability of good hydrophilic retention even 2 days after UV-irradiation.
关键词： PF127,self-cleaning,PMMA,transparent coatings,dip-coating,UV-irradiation,TiO2?ZrO2,superhydrophilic
更新于2025-09-23 15:21:01
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Laser induced graphene printing of spatially controlled super-hydrophobic/hydrophilic surfaces
摘要： Spatial control over the wetting properties of graphene surfaces is a desired feature in numerous applications. Traditionally, this is achieved using time consuming chemical treatment processes that lack spatial tuning. Here, we demonstrate the use of laser induced graphene for the direct, spatial printing of surfaces with either superhydrophilic or superhydrophobic character through simple and convenient control over graphene array morphology, and without the need for chemical surface modification. The wetting properties of the graphene surfaces range from superhydrophilic (0°) for sheet-like structures, to superhydrophobic (>150°) for micro-pillar and hemispherical structures. By varying the induction parameters of the CO2 laser, we demonstrate the ability to write patterns with spatially tailored wettability to enable liquid micro-patterning and channeling of flow. Furthermore, we study solid-liquid interactions for such surfaces using viscosity measurements, where a “petal effect” is observed in the graphene material, thus revealing the parahydrophobicity of the surface.
关键词： Superhydrophobic,Superhydrophilic,Petal effect,Laser induced graphene,Wettability
更新于2025-09-23 15:19:57
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Superhydrophilic Graphdiyne Accelerates Interfacial Mass/Electron Transportation to Boost Electrocatalytic and Photoelectrocatalytic Water Oxidation Activity
摘要： Graphdiyne (GDY), with a highly π-conjugated structure of sp2- and sp-hybridized carbon, has triggered a huge interest in water splitting. However, all of the systems perform with no consideration of the surface wettability of GDY. Herein, for the first time, the fabrication of superhydrophilic GDY electrode via air-plasma for oxygen evolution is described. As a representative catalyst, ultrathin CoAl-LDH (CO3 2?) nanosheets have been successfully assembled onto the superhydrophilic GDY electrostatically. The resulting superhydrophilic CoAl-LDH/GDY electrode exhibites superior activity with an overpotential of ≈258 mV to reach 10 mA cm?2. The turnover frequency (TOF) is calculated to be ≈0.60 s?1 at η = 300 mV, which is the best record in both CoAl-based and GDY-based layered double hydroxides (LDH) electrocatalysts for oxygen evolution. Density functional theory (DFT) calculations reveal that superhydrophilic GDY has stronger interactions with catalysts and attracts H2O molecules around catalysts, thus facilitating interfacial mass/electron transportation. Further, the fabrication is capable of improving the photoelectrochemical oxygen evolution activity remarkably. The results show the great potential of superhydrophilic GDY to boost water oxidation activity by promoting interfacial mass/electron transportation.
关键词： superhydrophilic graphdiyne,water oxidation,electrocatalysis,photoelectrocatalysis
更新于2025-09-19 17:15:36
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Under-oil self-driven and directional transport of water on femtosecond laser-processed superhydrophilic geometry-gradient structure
摘要： Self-driven and continuous directional transport of water droplets in the oil environment has great potential applications in microfluidics, oil-water separation, etc. Nevertheless, most current studies exploit water behaviors occurring in air, and the directional regulation of water under a viscous oil medium remains a challenge. In this work, a superhydrophilic geometry-gradient stainless-steel platform with nanoparticles-covered nanoripples structure is proposed using femtosecond laser direct writing technology. The as-prepared sample spontaneously and directionally transported water droplets in the oil environment from the minor side to the large side of the trapezoidal platform surface, but not in the opposite direction. The transport velocity of water droplets as a function of trapezoid angle and tilt angle of the as-prepared platform was investigated in detail. In addition, the pumpless under-oil water transport platform was successfully prepared on other substrates including Ti and Ni sheets, polyimide film, and C cloth, and exhibited transport capabilities when the platform was flexed and combined into various shapes. This work offers insights for simple fabrication of a flexible and substrate-independent pumpless under-oil directional transport device for water.
关键词： femtosecond laser,superhydrophilic,under-oil,water droplets,directional transport
更新于2025-09-19 17:13:59
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Heterostructured PPy/ZnO layer assembled PAN nanofibrous membrane with robust visible-light-induced self-cleaning for high efficient water purification with fast separation flux
摘要： Developing superhydrophilic/underwater superoleophobic surface to restrict oil pollution from oil/water separation process has been an effective method. However, inevitable adsorption and aggregation of organic contaminants onto membrane surface from complex oily sewage usually caused irreversibly decrease of flux, injurie of anti-oilfouling and shorten lifespan for separation membrane. Thus, a neoteric antifouling and renewable membrane is high desired. Herein, based on stabilized PAN nanofibers and followed assembled heterostructured PPy/ZnO layer with hierarchical structures onto the nanofibers surface, we reported a robust visible-light-induced self-repairable oil/water separation membrane. The SPAN-PPy/ZnO membrane displays superhydrophilicity (≈0°) and underwater superoleophobicity (>150°) for different oils, robust mechanical strength (≈408 MPa of Young’s modulus) and underwater high oil intrusion pressure (>120 kPa). Importantly, the as-prepared membrane not exhibits ultrafast permeation flux and high separation efficiency for oil/dyes/water emulsion, but also displays robust recovery ability (96%) after organic-polluted after 20 min light irradiation. We anticipate this composite membrane with outstanding separation capablity and robust flux recovery capable can provide a novel method for treation the large volume of wastewater purification.
关键词： heterostructured PPy/ZnO,visible-light-induced self-cleaning,superhydrophilic,underwater superoleophobic,oil/water separation
更新于2025-09-19 17:13:59
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Generation of microcones on reaction-bonded silicon carbide by nanosecond pulsed laser irradiation
摘要： Silicon carbide (SiC) is heavily used in the industry due to its resistance to chemical wear and excellent mechanical properties such as high hardness and high stiffness. However, these properties make it difficult to produce micro and nanostructures on the surface of SiC by conventional methods. In this study, high-density microcones that protrude ~ 10 μm above the initial surface have been fabricated by nanosecond pulsed Nd:YAG laser irradiation (λ = 532 nm) on reaction-bonded SiC. Geometrically aligned cones were also fabricated by modifying the laser scanning path, and effect of different parameters such as pulse frequency, laser fluence was studied. It was observed that the surface morphology of microcones was affected by the pulse width and beam overlap. X-ray spectroscopy and Raman spectroscopy showed that the microcones were mainly composed of silicon. Formation of these cone structures made the surface highly superhydrophilic with a contact angle of ~ 0°.
关键词： Laser irradiation,Microcone,Surface texturing,Reaction-bonded silicon carbide,Superhydrophilic surface
更新于2025-09-12 10:27:22
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Facile Fabrication of Multifunctional ZnO Urchins on Surfaces
摘要： Functional ZnO nanostructured surfaces are important in a wide range of applications. Here we report the simple fabrication of ZnO surface structures at near room temperature with morphology resembling that of sea urchins, with densely packed, μm-long, tapered nanoneedles radiating from the urchin center. The ZnO urchin structures were successfully formed on several different substrates with high surface density and coverage, including silicon (Si), glass, polydimethylsiloxane (PDMS), and copper (Cu) sheets, as well as Si seeded with ZnO nanocrystals. Time-resolved SEM revealed growth kinetics of the ZnO nanostructures on Si, capturing the emergence of 'infant' urchins at the early growth stage and subsequent progressive increases in the urchin nanoneedle length and density, whilst the spiky nanoneedle morphology was retained throughout the growth. ε-Zn(OH)2 orthorhombic crystals were also observed alongside the urchins. The crystal structures of the nanostructures at different growth times were confirmed by synchrotron X-ray diffraction measurements. On seeded Si substrates, a two-stage growth mechanism was identified, with a primary growth step of vertically aligned ZnO nanoneedle arrays preceding the secondary growth of the urchins atop the nanoneedle array. The antibacterial, anti-reflective, and wetting functionality of the ZnO urchins—with spiky nanoneedles and at high surface density—on Si substrates was demonstrated. First, bacteria colonization was found to be suppressed on the surface after 24 h incubation in gram-negative Escherichia coli (E. coli) culture, in contrast to control substrates (bare Si and Si sputtered with a 20 nm ZnO thin film). Secondly, the ZnO urchin surface, exhibiting superhydrophilic property with a water contact angle ～ 0°, could be rendered superhydrophobic with a simple silanization step, characterized by an apparent water contact angle θ of 159° ± 1.4° and contact angle hysteresis ?θ < 7°. The dynamic superhydrophobicity of the surface was demonstrated by the bouncing-off of a falling 10 μL water droplet, with a contact time of 15.3 milliseconds (ms), captured using a high-speed camera. Thirdly, it was shown that the presence of dense spiky ZnO nanoneedles and urchins on the seeded Si substrate exhibited a reflectance R < 1% over the wavelength range λ = 200–800 nm. The ZnO urchins with a unique morphology fabricated via a simple route at room temperature, and readily implementable on different substrates, may be further exploited for multifunctional surfaces and product formulations.
关键词： superhydrophilic,superhydrophobic,anti-reflective surfaces,ZnO urchins,E. coli,nanostructured surfaces
更新于2025-09-04 15:30:14
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Creation of Superhydrophobic and Superhydrophilic Surfaces on ABS Employing a Nanosecond Laser
摘要： A nanosecond green laser was employed to obtain both superhydrophobic and superhydrophilic surfaces on a white commercial acrylonitrile-butadiene-styrene copolymer (ABS). These wetting behaviors were directly related to a laser-induced superficial modification. A predefined pattern was not produced by the laser, rather, the entire surface was covered with laser pulses at 1200 DPI by placing the sample at different positions along the focal axis. The changes were related to the laser fluence used in each case. The highest fluence, on the focal position, induced a drastic heating of the material surface, and this enabled the melted material to flow, thus leading to an almost flat superhydrophilic surface. By contrast, the use of a lower fluence by placing the sample 0.8 μm out of the focal position led to a poor material flow and a fast cooling that froze in a rugged superhydrophobic surface. Contact angles higher than 150? and roll angles of less than 10? were obtained. These wetting behaviors were stable over time.
关键词： superhydrophilic,superhydrophobic,surface wettability,nanosecond laser surface modification,ABS (Acrylonitrile-Butadiene-Styrene)
更新于2025-09-04 15:30:14