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Transparent hard self-cleaning nano-hybrid coating on polymeric substrate
摘要： In this research, GPTMS-silica nano-hybrid coatings were immobilized on polycarbonate (PC) substrates by a sol-gel method. Perfluorooctyl-trichlorosilane (PFTS) was utilized to modify the prepared nano-hybrid coating surface. The modified nano-hybrid coatings were characterized by Field Emission Scanning Electron Microscope (FE-SEM), Energy Dispersive X-ray Spectrometry (EDS), atomic force microscopy (AFM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), UV–vis-NIR spectrophotometer, and water contact angle analyzer methods. In addition, the self-cleaning properties of the nano-hybrid coatings were investigated. The results indicated that the formation of the nano-hybrid film improved the hardness and transmittance of the PC substrate. FE-SEM image indicated the formation of the crack free coating on the PC substrate. In addition, the modified nano-hybrid coating displays hydrophobicity (CA, 110°) and is very efficient at removing dust through water droplets.
关键词： Polycarbonate,Coating,Transparent,Hydrophobic,Self-cleaning,Nano-hybrid
更新于2025-09-23 15:23:52
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Hydrophobic Metal Halide Perovskites for Visible-Light Photoredox C-C Bond Cleavage and Dehydrogenation Catalysis
摘要： Two-dimensional lead and tin halide perovskites were prepared by intercalating the long alkyl group 1-hexadecylammonium (HDA) between the inorganic layers. We observed visible-light absorption, narrow-band photoluminescence, and nanosecond photoexcited lifetimes in these perovskites. Due to their hydrophobicity and stability even in humid air, we applied these perovskites in the decarboxylation and dehydrogenation of indoline acids using (HDA)2PbI4 or (HDA)2SnI4 as photoredox catalysts, with quantitative conversions and high yields for the former. We highlight another original application of the metal halide perovskites.
关键词： photocatalysis,2D metal halide perovskites,decarboxylation,photooxidation,hydrophobic perovskite
更新于2025-09-23 15:23:52
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Fighting aggregation-caused quenching and leakage of dyes in fluorescent polymer nanoparticles: universal role of counterion
摘要： Dye-loaded polymer nanoparticles (NPs) emerge as a powerful tool for bioimaging applications, owing to their exceptional brightness and controlled small size. However, aggregation-caused quenching (ACQ) and leakage of dyes at high loading remain important challenges of these nanomaterials. The use of bulky hydrophobic counterions has been recently proposed as an effective approach to minimize ACQ and dye leakage, but the role of counterion structure is still poorly understood. Here, a systematic study based on ten counterions, ranging from small hydrophilic perchlorate up to large hydrophobic tetraphenylborate derivatives, reveals how counterion nature can control encapsulation and emission of a cationic dye (rhodamine B octadecyl ester) in NPs prepared by nanoprecipitation of a biodegradable polymer, poly-lactide-co-glycolide (PLGA). We found that increase in counterion hydrophobicity enhances dye encapsulation efficiency and prevents dye adsorption at the particle surface. Cellular imaging studies revealed that ≥95% encapsulation efficiency, achieved with most hydrophobic counterions (fluorinated tetraphenylborates), is absolutely required, because non-encapsulated dye species at the NPs surface are the origin of dye leakage and strong background in cells. The size of counterions is found to be essential to prevent ACQ, where the largest species, serving as effective spacer between dyes, provide the highest fluorescence quantum yield. Moreover, we found that the most hydrophobic counterions favor dye-dye coupling inside NPs, leading to ON/OFF fluorescence switching of single particles. By contrast, less hydrophobic counterions tend to disperse dyes in the polymer matrix favoring stable emission of NPs. The obtained structure-property relationships validate the counterion-based approach as a mature concept to fight ACQ and dye leakage in the development of advanced polymeric nanomaterials with controlled optical properties.
关键词： dye-loaded polymer nanoparticles,fluorescent nanoparticles,bulky hydrophobic counterion,aggregation-caused quenching,bioimaging
更新于2025-09-23 15:23:52
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Octadecyltrichlorosilane Capped Au Nanodot Arrays as Hydrophobic Surface Enhanced Raman Scattering Substrate for Biomedical Applications
摘要： Plasmonic nanostructures provide as a highly active-SERS substrate that can potentially achieve biomolecules detection. However, the detection of highly diluted, small volume analyte detection remains an urgent problem, due to the diffuse over the hydrophilic surfaces, which far from the plasmonic sensitive areas and limits the SERS detection sensitivity. In this study, we describe the fabrication and characterization of octadecyltrichlorosilane (OTS) capped gold nanodot (Au ND) arrays, the combination of hydrophobic surfaces and nanoplasmonics, and demonstrates their suitability as hydrophobic SERS active substrate for biomedical application. The activity of OTS capped Au ND arrays as SERS substrate was experimentally verified using Rhodamine B as an analyte. This substrate showed 3-fold signal enhancement compared to the ordinary hydrophilic Au ND arrays due to the hydrophobic condensation effect. It is expected that the OTS capped Au ND arrays can be lead to development of a highly sensitive and selective tool for biomedical applications using SERS detection.
关键词： Gold Nanodot Arrays,Octadecyltrichlorosilane,Surface Enhanced Raman Scattering,Hydrophobic,Plasmonic Structure,Biomedical Application
更新于2025-09-23 15:22:29
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Extremely Hydrophobic Zinc Oxide Micro/nanostructures on Stainless Steel Surfaces with Anti-biofilm Property
摘要： The extremely hydrophobic zinc oxide micro/nanostructures with microscale bundles and nanoscale rods were obtained by sol-gel method and hydrothermal method on stainless steel surfaces. The prepared extremely hydrophobic zinc oxide films were proven to possess excellent anti-biofilm property, which may lead to some new promising applications for inhibiting biofilm formation.
关键词： Hydrophobic surface,Zinc oxide,Anti biofilm
更新于2025-09-23 15:22:29
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Hybrid Laser Ablation and Chemical Modification for Fast Fabrication of Bio-inspired Super-hydrophobic Surface with Excellent Self-cleaning, Stability and Corrosion Resistance
摘要： Although laser ablation is considered as a facile technique to fabricate bio-inspired super-hydrophobic surfaces, the issue is that the initial laser treated metallic surfaces show super-hydrophilic property. It will take a long period to reach super-hydrophobic state under ambient air. It is reported that these super-hydrophobic surfaces could be easily damaged by thermal heating effect or interaction with other liquids, causing uncontrolled loss of super-hydrophobicity. In this study, a stable super-hydrophobic aluminum surface was rapidly fabricated via the hybrid laser ablation and surface chemical modification of (heptadecafluoro-1, 1, 2, 2-tetradecyl) triethoxysilane (AC-FAS). Surface morphology and chemistry were systematically investigated to explore the generation mechanism of super-hydrophobicity. The water contact angle of the treated surfaces can reach up to 160.6? ± 1.5? with rolling angle of 3.0? ± 1.0?, exhibiting perfect self-cleaning capability, long-term stability, and excellent chemical stability in acidic as well as alkaline solutions. The potentiodynamic polarization tests implied that the super-hydrophobic surfaces showed better anti-corrosion performance. This hybrid laser ablation and surface chemical modification are very time-saving and low-cost, which offers a rapid way for quantity production of super-hydrophobic surface on aluminum material.
关键词： nanosecond laser,bioinspiration,corrosion resistance,chemical stability,self-cleaning,super-hydrophobic,long-term stability
更新于2025-09-23 15:22:29
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A Novel Technique to Release Sticking Haptic of a Single-Piece Hydrophobic Acrylic IOL using Irrigation-Aspiration Probe
摘要： Purpose: To describe a novel technique to release sticking haptic of a single-piece hydrophobic acrylic intraocular lens (IOL) using irrigation-aspiration (I/A) probe. Methods: In our technique, the I/A probe is introduced into the anterior chamber on Visco mode. Using the aspiration port of the I/A probe, the sticking haptic is held at its tip and suction force is built up until occlusion is noted. Then the haptic is nudged towards the center of the IOL along its curve. After the haptic is free from optic, the suction is released. results: Several techniques have been described to release the sticking haptic such as squeezing the haptic at the site where it sticks to the IOL or using Sinskey hook for releasing the adhesion. These techniques require extra manipulation of the IOL by introduction of surgical instruments. In our technique, we used the I/A probe itself for separating the sticky haptic successfully. conclusions: This technique allows separation of sticking haptic without any extra instrumentation, thus reducing intraocular maneuvering and total surgery time.
关键词： Hydrophobic acrylic IOL,Sticking haptic,Irrigation and aspiration probe
更新于2025-09-23 15:22:29
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Hydrophobic Metal Halide Perovskites for Visible-Light Photoredox C-C Bond Cleavage and Dehydrogenation Catalysis
摘要： Two-dimensional lead and tin halide perovskites were prepared by intercalating the long alkyl group 1-hexadecylammonium (HDA) between the inorganic layers. We observed visible-light absorption, narrow-band photoluminescence, and nanosecond photoexcited lifetimes in these perovskites. Due to their hydrophobicity and stability even in humid air, we applied these perovskites in the decarboxylation and dehydrogenation of indoline acids using (HDA)2PbI4 or (HDA)2SnI4 as photoredox catalysts, with quantitative conversions and high yields for the former. We highlight another original application of the metal halide perovskites.
关键词： photocatalysis,2D metal halide perovskites,decarboxylation,photooxidation,hydrophobic perovskite
更新于2025-09-23 15:22:29
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Hidden Isolated OH at the Charged Hydrophobic Interface Revealed by Two-Dimensional Heterodyne-Detected VSFG Spectroscopy
摘要： Water around hydrophobic groups mediates hydrophobic interactions that play key roles in many chemical and biological processes. Thus, the molecular-level elucidation of the properties of water in the vicinity of hydrophobic groups is important. We report on the structure and dynamics of water at two oppositely charged hydrophobic ion/water interfaces, the tetraphenylborate-ion (TPB?)/water and tetraphenylarsonium-ion (TPA+)/water interfaces, which are clarified by two-dimensional heterodyne-detected vibrational sum-frequency generation (2D HD-VSFG) spectroscopy. The obtained 2D HD-VSFG spectra of the anionic TPB? interface reveal the existence of distinct π-hydrogen bonded OH groups in addition to the usual hydrogen-bonded OH groups, which are hidden in the steady-state spectrum. In contrast, 2D HD-VSFG spectra of the cationic TPA+ interface only show the presence of usual hydrogen-bonded OH groups. The present study demonstrates that the sign of the interfacial charge governs the structure and dynamics of water molecules that face the hydrophobic region.
关键词： hydrophobic interfaces,sum-frequency generation,ultrafast spectroscopy,interfacial water,vibrational dynamics
更新于2025-09-23 15:21:01
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Fabrication of oila??water separation copper filter by spatial light modulated femtosecond laser
摘要： Surface with oil-water separation performance has attracted more and more attention in the application of oil-containing wastewater purification. Much related work has been done by many researchers. However, there are still many difficulties in rapid manufacturing of filter membranes with special wettability. In this paper, an efficient, flexible method to fabricate microporous arrays by using femtosecond (fs) laser combined with spatial light modulator (SLM) is proposed. The laser treated copper sheet surface shows hydrophobic and superoleophilic properties due to the microstructure. Meanwhile, the array of micro-through-holes on the surface can allow oil to penetrate through holes and prevent water from penetrating. The manufacturing process is not only extremely efficient, 10×10 focus array are used in the ablation, but also it is without chemical method and the filter presents a long-term stable hydrophobic and superoleophilic performance.
关键词： Superoleophilic,Oil-water separation,Hydrophobic,Spatial light modulator,Femtosecond laser
更新于2025-09-23 15:21:01