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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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Antireflective Transparent Oleophobic Surface by Non-Interacting Cavities
摘要： Oleophobic surfaces have been so far realized using complex micro-scale and nano-scale re-entrant geometries where primary and secondary structures or overhang geometries are typically required. Here we propose a new design to create them with non-interacting cavities. The suspension of liquid droplets relies on the mechanism of compression of air under the meniscus leading to stable composite oil-air-solid interfaces. To demonstrate the concept, we make oleophobic surfaces, with contact angle for oleic acid of about 130o (and Hexadecane about 110o), using both micro-holes in silicon and nano-holes in glass. Thanks to the subwavelength dimensions and antireflection effect of the nano-holes, the glass substrate also shows a high degree of optical transparency with optical transmission exceeding that of the initial bare substrate. Crockmeter tests without any significant change of morphology, optical and wetting properties after more than 500 passes also confirm the high mechanical durability of the nano-hole surface. The results indicate the possibility of using the proposed oleophobic surfaces for a wide range of applications, including self-cleaning transparent windows, windshields for automobiles and aircrafts.
关键词： Antireflective,cavities,Transparent surface,nanostructured optical surfaces,Oleophobic,self-cleaning,Micro-Nano manufacturing,surface wetting
更新于2025-09-23 15:21:01
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Influence of laser texturing on the wettability of PTFE
摘要： Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer showing excellent thermal and electrical insulation properties and a low coefficient of friction. Due to its large stability, and hydrophobic nature, the wettability of PTFE surfaces can be reduced to transform them into superhydrophobic. In this regard, laser texturing is a fast, simple and versatile method to produce superhydrophobic PTFE surfaces in one-step, and over large areas. In this work, we used a CO2 laser to modify the surface of PTFE samples. We studied the effect of the processing parameters (laser power or irradiance, scanning speed, and spacing -overlapping- between scan lines) on the wettability of textured surfaces using water, mineral oil and ethanol/water solutions as test fluids. Laser-treated surfaces showed a hierarchical micro- and nanotopography with a cotton-like appearance. The higher roughness and large quantity of air pockets make these laser-treated surfaces superhydrophobic, and highly oleophobic. Furthermore, they remain unaltered after being in contact with strong alkali and acid solutions or after slight friction. The self-cleaning performance of these surfaces was also demonstrated. The present findings suggest that CO2 laser texturing of PTFE is suitable for the large-scale preparation of surfaces with low-wettability to different liquids.
关键词： Polytetrafluoroethylene (PTFE),self-cleaning,wettability,laser texturing
更新于2025-09-23 15:19:57
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Handbook of Smart Photocatalytic Materials || Sustainable photocatalytic porcelain gr??s slabs active under LED light for indoor depollution and bacteria reduction
摘要： The photocatalytic performances of TiO2-based and doped Ag-TiO2-based porcelain grés ceramic tiles as self-cleaning materials developed by digital printing process were investigated. The photoactive tiles coated with doped Ag-TiO2 K1077 showed better photocatalytic efficiency than tiles coated with TiO2 K1077 for the degradation of NOx and ethanol due to the better light absorption and higher electron–hole pairs separation caused by Ag nanoparticles. The total mineralization of EtOH to CO2 was proved. The photoactive tiles also exhibited an excellent efficiency for the densification of E. coli and S. aureus. These experimental data manifested the efficient and durable water and air treatment/densification using Ag-TiO2-based porcelain grés ceramic tiles, which may be significant to future use as self-cleaning materials.
关键词： LED light,bacteria reduction,porcelain grés ceramic tiles,photocatalytic,depollution,Ag-TiO2,TiO2,self-cleaning
更新于2025-09-23 15:19:57
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[IEEE 2018 7th Electronic System-Integration Technology Conference (ESTC) - Dresden, Germany (2018.9.18-2018.9.21)] 2018 7th Electronic System-Integration Technology Conference (ESTC) - Hybrid (PI-PDMS) Superhydrophobic Wearable Dry-Patching Flexible and Transparent Substrate
摘要： The hybrid thin film is fabricated by using polyimide (PI) and Polydimethylsiloxane (PDMS) to take combined advantages of their transparency, thermal stability and stretchability. Furthermore, another importance of such subtract is superhydrophobicity, having highly water repellent, dustproof and self-cleaning effect which is beneficial for its long-term performance. The demand for dry patching has been increased as compared with wet patching films due to optical transmittance and long term optimization, the patching devices mechanism for those devices can be mechanical deformation experienced with bending, pressing, twisting and pressing, without any compromise on the comfort of the user, those mechanical characteristics leads towards the adhesion of the substrate via van der Waals force without using any wet adhesion. The actively explored field of flexible and wearable applications are in healthcare and artificial electronic skins which are interestingly capable of detecting stress, strain, pain and temperature in real-time health monitoring. Since superhydrophobic properties combine with dry patching techniques provide a wide range of practical applications for the platform of the wearable dry patching substrate, it is expected that such works have an impact on flexible hybrid electronic (FHE) devices which can be rolled, stretched patching superhydrophobic substrate utilizing a polymer casting method showing a static CA and CAH angle of 179° and 10°, respectively, by creating the air pocket between the micro pillars (30μm) which counterbalances the water droplet on the surface. Such hybrid in microelectronics applications; it provides more desirable properties in many fields of application (mechanical, thermal, optical and chemical). In this article, we discussed the fabrication of a dry-patching substrate using hybrid film that has a superhydrophobic surface substrates are widely used bent. The fabricated and dry.
关键词： Wearable Devices,Dry Patching,Flexible,Self-Cleaning,Superhydrophobic,Low Hysteresis
更新于2025-09-23 15:19:57
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Wettability, Photoactivity, and Antimicrobial Activity of Glazed Ceramic Tiles Coated with Titania Films Containing Tungsten
摘要： Self-cleaning coatings are advanced materials for the removal of pollutants and microorganisms by combining wettability, photocatalytic degradation, and antimicrobial activity. In this work, we propose a rational design of self-cleaning films based on TiO2 synthesized by sol?gel on commercial glazed ceramic tiles for building’s indoor applications. The synthesis strategy is based on hydrolysis and condensation of Ti-isopropoxide in the presence of W(VI) precursors to tune defects and crystallinity of the resulting W?TiO2 thin film. From the microstructure and surface composition analysis for different tungsten contents and annealing temperatures, we conclude that the film is composed by sintered TiO2 particles with adsorbed polytungstates (WOx) that inhibit anatase/rutile transformation. Polytungstates on TiO2 also induce surface defects that enhance water contact angle and inactivation of Escherichia coli under visible light. The presence of W(VI) has a negligible effect toward crystal violet degradation either under visible or under UV light. These results provide evidence on the existence of at least two different types of defects: (i) intrinsic defect from a sol?gel route and (ii) induced defect by tungsten species on the surface. Understanding the correlation between composition, structure, and self-cleaning properties provides a base for an efficient design of low-cost self-cleaning ceramic tiles that can be fully manufactured in an industrial plant.
关键词： photocatalytic degradation,sol?gel,W?TiO2,TiO2,antimicrobial activity,self-cleaning coatings
更新于2025-09-23 15:19:57
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Improved Self-Cleaning Properties of Photocatalytic Gypsum Plaster Enriched with Glass Fiber
摘要： In the study the self-cleaning properties of photoactive gypsum plasters are presented. The modified gypsum plasters were obtained by addition of 1 and 3 wt.% of nitrogen-modified titanium dioxide (TiO2/N) and 0.1, 0.3, and 0.5 wt.% of glass fiber. The self-cleaning ability of the obtained materials was tested during two dyes decomposition: Methylene Blue (MB) and Reactive Orange (RO). It was found that presence of glass fiber increased photocatalytic activity of modified gypsum plasters, which may be due to the fact glass fiber may act as ducts for light and transport it to sites screened by TiO2 or glass fiber can retard charge recombination. Moreover, unexpectedly the addition of glass fiber did not increase the mechanical properties of modified gypsum plasters, which may be because gypsum does not strongly adhere to the surface of glass fibers.
关键词： glass fiber,photocatalysis,self-cleaning,gypsum plaster
更新于2025-09-19 17:15:36
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Multi-functional MnO <sub/>2</sub> nanomaterials for photo-activated applications by a plasma-assisted fabrication route
摘要： Supported MnO2-based nanomaterials were fabricated on fluorine-doped tin oxide substrates using plasma enhanced-chemical vapor deposition (PE-CVD) between 100 °C and 400 °C, starting from a fluorinated Mn(II) diamine diketonate precursor. Growth experiments yielded β-MnO2 with a hierarchical morphology tuneable from dendritic structures to quasi-1D nanosystems as a function of growth temperature, whose variation also enabled a concomitant tailoring of the system fluorine content, and of the optical absorption and band gap. Preliminary photocatalytic tests were aimed at the investigation of photoinduced hydrophilic (PH) and solid phase photocatalytic (PC) performances of the present nanomaterials, as well as at the photodegradation of Plasmocorinth B azo-dye aqueous solutions. The obtained findings highlighted an attractive system photoactivity even under visible light, finely tailored by fluorine content, morphological organization and optical properties of the prepared nanostructures. The results indicate that the synthesized MnO2 nanosystems have potential applications as advanced smart materials for anti-fogging/self-cleaning end uses and water purification.
关键词： anti-fogging,photoactivated applications,fluorine doping,photocatalysis,water purification,self-cleaning,plasma-assisted fabrication,MnO2 nanomaterials
更新于2025-09-19 17:15:36
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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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Plasmonic hybrid platinum-titania nanocomposites as highly active photocatalysts: self-cleaning of cotton fiber under solar light
摘要： In the present paper, a one-step, simple, efficient and low-cost strategy was demonstrated for preparing of highly stable hybrid platinum-titania (Pt@TiO2) photocatalyst by solvothermal wet chemical process. Platinum (Pt) in the metallic form combined with titania (TiO2) in the crystallographic anatase form has been manufactured using Dimethyl Sulfoxide (DMSO) as a solvent and surfactant using titanium (IV) butoxide and hydrogen hexachloroplatinate(IV) precursors. Full characterization of the hybrid nanomaterials including their morphology, crystalline structure and optical properties was determinate using different experimental techniques such as XRD, TEM and UV–vis spectroscopy. TEM images showed spherically shaped Pt nanoparticles (NPs) of the diameter 5–10 nm with good particle size distribution. The EDXRF data revealed that Pt NPs are in metallic form. Optical investigation show that Pt@TiO2 NPs exhibits a good optical response under UV–vis light excitation compared to bare-TiO2. Furthermore, photocatalytic investigation of Pt@TiO2 colloids photocatalyst towards the photodegradation of diuron, as a model organic pesticide was reported. The hybrid Pt@TiO2 photocatalyst prove high-performance on the photodecomposition of the pesticide under solar light within only 60 min. In the other hand, the plasmonic hybrid Pt@TiO2 was incorporated into the cotton fabric to attain a modified fiber with high self-cleaning activity.
关键词： Self-cleaning,Semiconductors,Heterogenous catalysis,Cotton fiber,Solvothermal method,Nanocomposites
更新于2025-09-16 10:30:52