Constructing Fluorine-Free and Cost-Effective Superhydrophobic Surface with Normal-Alcohol-Modified Hydrophobic SiO2 Nanoparticles

2016 ◽  
Vol 9 (1) ◽  
pp. 858-867 ◽  
Author(s):  
Hui Ye ◽  
Liqun Zhu ◽  
Weiping Li ◽  
Huicong Liu ◽  
Haining Chen
Keyword(s):  
Superhydrophobic Surface ◽  
Cost Effective ◽  
Sio2 Nanoparticles ◽  
Normal Alcohol ◽  
Hydrophobic Sio2

scholarly journals Effective Harmful Organism Management I: Fabrication of Facile and Robust Superhydrophobic Coating on Fabric

2020 ◽  
Vol 12 (15) ◽  
pp. 5876
Author(s):  
Chang-Ho Choi ◽  
Yeongwon Kwak ◽  
Min Kyung Kim ◽  
Dong Gun Kim
Keyword(s):  
Epoxy Resin ◽  
Superhydrophobic Surface ◽  
Coating Layer ◽  
Sio2 Nanoparticles ◽  
Research Subject ◽  
Superhydrophobic Coating ◽  
Promising Alternative ◽  
Salty Water ◽  
Slide Angle ◽  
Conventional Coating

Advances in harmful organism management are highly demanding due to the toxicity of conventional coating approaches. Exploiting biomimetic superhydrophobicity could be a promising alternative on account of its cost-effectiveness and eco-friendliness. Here, we introduce a facile method to fabricate a robust superhydrophobic coating on a fabric substrate. This is achieved by sequentially spraying TiO2-epoxy resin nanocomposite material and fluorocarbon-silane modified SiO2 nanoparticles (FC-silane SiO2 NPs). The superhydrophobicity is attributed to the nanoparticles constituting a micro/nano hierarchical structure and the fluorocarbon of the modified SiO2 NPs lowering the surface energy. The epoxy resin embedded in the coating layer plays an important role in improving the robustness. The robustness of the superhydrophobic surface is demonstrated by measuring the water slide angle of surfaces that are subject to salty water at 500 rpm stirring condition for up to 13 days. This study focuses on ensuring the superhydrophobicity and robustness of the coating surface, which is preliminary work for the practical management of macrofoulers. Based on this work, we will perform practical harmful organism management in seawater as a second research subject.

scholarly journals Magnetic Control of an Electrochemical Microfluidic Device with an Arrayed Immunosensor for Simultaneous Multiple Immunoassays

2007 ◽  
Vol 53 (7) ◽  
pp. 1323-1329 ◽  
Author(s):  
Dianping Tang ◽  
Ruo Yuan ◽  
Yaqin Chai
Keyword(s):  
Tumor Markers ◽  
Microfluidic Device ◽  
Simultaneous Detection ◽  
Reference Electrode ◽  
Cost Effective ◽  
Sio2 Nanoparticles ◽  
Magnetic Bead ◽  
Label Free ◽  
Specific Tumor ◽  
Protein Diagnostics

Abstract Background: Methods based on magnetic bead probes have been developed for immunoassay, but most involve complicated labeling or stripping procedures and are unsuitable for routine use. Methods: We synthesized magnet core/shell NiFe2O4/SiO2 nanoparticles and fabricated an electrochemical magnetic controlled microfluidic device for the detection of 4 tumor markers. The immunoassay system consisted of 5 working electrodes and an Ag/AgCl reference electrode integrated on a glass substrate. Each working electrode contained a different antibody immobilized on the NiFe2O4/SiO2 nanoparticle surface and was capable of measuring a specific tumor marker using noncompetitive electrochemical immunoassay. Results: Under optimal conditions, the multiplex immunoassay enabled the simultaneous detection of 4 tumor markers. The sensor detection limit was <0.5 μg/L (or <0.5 kunits/L) for most analytes. Intra- and interassay imprecisions (CVs) were <4.5% and 8.7% for analyte concentrations >5 μg/L (or >5 kunits/L), respectively. No nonspecific adsorption was observed during a series of procedures to detect target proteins, and electrochemical cross-talk (CV) between neighboring sites was <10%. Conclusion: This immunoassay system offers promise for label-free, rapid, simple, cost-effective analysis of biological samples. Importantly, the chip-based immunosensor could be suitable for use in the mass production of miniaturized lab-on-a-chip devices and open new opportunities for protein diagnostics and biosecurity.

Toward Easily Enlarged Superhydrophobic Copper Surfaces with Enhanced Corrosion Resistance, Excellent Self-Cleaning and Anti-Icing Performance by a Facile Method

2020 ◽  
Vol 20 (10) ◽  
pp. 6317-6325 ◽  
Author(s):  
Xueting Shi ◽  
Libin Zhao ◽  
Jing Wang ◽  
Libang Feng
Keyword(s):  
Corrosion Resistance ◽  
Superhydrophobic Surface ◽  
Cost Effective ◽  
Copper Plate ◽  
Plate Surface ◽  
Water Contact ◽  
Copper Surfaces ◽  
Self Cleaning ◽  
Water Repellence

This work reports a facile method for fabricating superhydrophobic surface on copper plate by AgNO3 treatment and dodecyl mercaptan modification. The as-prepared superhydrophobic copper plate presents hierarchical and rough morphology composed of nanosheets and nanoparticleformed matrix. Meanwhile, long alkyl chains are assembled onto the rough surface successfully. Consequently, the copper plate is endowed with excellent superhydrophobic performance with a water contact angle of 156.8° and a rolling angle of ca. 3°. Moreover, the superhydrophobicity has long-term durability and excellent stability. Grounded on the strong water repellence, the resultant superhydrophobic copper plate surface exhibits multi-functions. The excellent performance can be well explained by “Cushion effect” and Capillary phenomena. As a result, water and corrosive species can be prevented from contacting with the copper plate surface, and contaminants can be taken away easily by the rolling water droplets. Meanwhile, the icing process of water is delayed on the superhydrophobic surface. Therefore, the superhydrophobic copper is endued with enhanced corrosion resistance, excellent self-cleaning and anti-icing performance. We believe that this facile method provides a simple and cost-effective process to improve the properties of copper plate, and which may see practical application of the superhydrophobic materials.

scholarly journals Superhydrophobic Surface with Gamma Irradiation Resistance and Self-Cleaning Effect in Air and Oil

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 106 ◽  
Author(s):  
Yan Zhang ◽  
Jing Zhang ◽  
Yujian Liu
Keyword(s):  
Superhydrophobic Surface ◽  
Water Repellency ◽  
Sio2 Nanoparticles ◽  
Superior Performance ◽  
Sliding Angle ◽  
Water Contact ◽  
Composite Surface ◽  
Static Water Contact Angle ◽  
Static Water ◽  
Dirt Removal

A superhydrophobic surface was synthesized by a combination of an epoxy/polymethylphenylsiloxane matrix and dual-scale morphology of silica (SiO2) nanoparticles. When the amount of SiO2 reached 30 wt.%, the as-prepared surface showed a high static water contact angle (WCA) of 154° and a low sliding angle (SA) of 5°, excellent water repellency, and dirt-removal effects both in air and oil (hexamethylene). Even after exposure to as high as a 12.30 Mrad dose of gamma-rays, the composite surface still maintained its superior performance.

scholarly journals Improving the Hydrophobicity of ZnO by PTFE Incorporation

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Meenu Srivastava ◽  
Bharathi Bai J. Basu ◽  
K. S. Rajam
Keyword(s):  
Thermal Treatment ◽  
Stearic Acid ◽  
Superhydrophobic Surface ◽  
Cost Effective ◽  
Electrical Energy ◽  
High Water ◽  
Superhydrophobic Coating ◽  
Water Contact ◽  
Low Surface Energy ◽  
Effective Manner

The objective of the present study is to obtain a zinc oxide- (ZnO-) based superhydrophobic surface in a simple and cost-effective manner. Chemical immersion deposition being simple and economical has been adopted to develop modified ZnO coating on glass substrate. Several modifications of ZnO like treatment with alkanoic acid (stearic acid) and fluoroalkylsilane to tune the surface wettability (hydrophobicity) were attempted. The effect of thermal treatment on the hydrophobic performance was also studied. It was observed that thermal treatment at 70°C for 16 hrs followed by immersion in stearic acid resulted in high water contact angle (WCA), that is, a superhydrophobic surface. Thus, a modified ZnO superhydrophobic surface involves the consumption of large amount of electrical energy and time. Hence, the alternate involved the incorporation of low surface energy fluoropolymer polytetrafluoroethylene (PTFE) in the ZnO coating. The immersion deposited ZnO-PTFE composite coating on modification with either stearic acid or fluoroalkylsilane resulted in a better superhydrophobic surface. The coatings were characterized using Scanning Electron Microscope (SEM) for the surface morphology. It was found that microstructure of the coating was influenced by the additives employed. A flower-like morphology comprising of needle-like structure arranged in a radial manner was exhibited by the superhydrophobic coating.

scholarly journals Исследование влияния добавки наночастиц гидрофобного оксида кремния на коллоидную устойчивость обратных эмульсий

2021 ◽  
Vol 47 (15) ◽  
pp. 11
Author(s):  
Е.И. Михиенкова ◽  
А.В. Минаков ◽  
С.В. Лысаков ◽  
А.Л. Неверов ◽  
М.И. Пряжников
Keyword(s):  
Silicon Oxide ◽  
Experimental Studies ◽  
Sio2 Nanoparticles ◽  
Oxide Nanoparticles ◽  
Volume Fractions ◽  
Mineral Oils ◽  
Low Concentrations ◽  
Silicon Oxide Nanoparticles ◽  
The Stability ◽  
Hydrophobic Sio2

The results of experimental studies of the effect of the addition of silicon oxide nanoparticles on the stability of inverse emulsions based on mineral oils are presented. The concentration of nanoparticles in the emulsion was varied from 0.25 to 2 wt%. The following ratios of the volume fractions of the hydrocarbon phase and water were investigated: 70/30, 80/20, 90/10. Several types of emulsifiers have been considered. It has been shown that, even at low concentrations, hydrophobic SiO2 nanoparticles significantly improve the stability of inverse emulsions. Destabilization rate of the emulsion upon addition of 2 wt%. of nanoparticles decreases 1.7 times.

Impact of Hydrophobicity of SiO2 Nanoparticles on Enhancing Properties of Colloidal Gas Aphron Fluids: An Experimental Study

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Amir Hossein Hassani ◽  
Mohammad Hossein Ghazanfari
Keyword(s):  
Surface Active Agent ◽  
Sodium Dodecyl ◽  
Active Agent ◽  
Silica Nanoparticle ◽  
Sio2 Nanoparticles ◽  
Colloidal Gas Aphron ◽  
Infill Drilling ◽  
Pore Blockage ◽  
Surface Active ◽  
Hydrophobic Sio2

In recent years, colloidal gas aphron (CGA) fluids have been much attended by researchers for their possible application in infill drilling, due to their pore blockage ability. In this study, the possible synergistic effect of silica nanoparticle hydrophobicity in the presence of sodium dodecyl sulfate (SDS), as a surface active agent, on enhancement of properties of CGA fluids was experimentally investigated. Results revealed that the hydrophobicity of nanoparticles, adsorbed at the bubble interface, plays an important role in improving stability and blockage ability at low as well as high pressure/temperature conditions, low shear rate viscosity (LSRV), and return permeability ability of CGA dispersion measured in a special radial sand pack apparatus at different levels of surfactant concentration. It was observed that partially hydrophobic SiO2 nanoparticles (nanosilica coated with KH550-Silane) yield a better performance than both strongly hydrophilic and hydrophobic nanoparticles (silicon dioxide nanopowder coated with 2 wt. % Silane) which confirms what is expected from the particle detachment theory. Optimal SDS concentrations equal to 0.25 wt. % for strongly hydrophilic, and 0.33 wt. % for both strongly hydrophobic and partially hydrophobic SiO2 nanoparticles were also found, which maximize the improving effect of CGA fluids. The superiority of the aphronized fluid improved by partially hydrophobic nanoparticles of SiO2 to CGA fluid stabilized only by surfactant makes the CGA fluids attractive for some industrial and drilling applications.

scholarly journals Fabrication and Characterization of Superhydrophobic Graphene/Titanium Dioxide Nanoparticles Composite

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 122
Author(s):  
Xun Hui Wu ◽  
Yoon Yee Then
Keyword(s):  
Contact Angle ◽  
Titanium Dioxide ◽  
Water Contact Angle ◽  
Medical Devices ◽  
Superhydrophobic Surface ◽  
Cost Effective ◽  
Tio2 Coating ◽  
Hybrid Nanoparticles ◽  
Poly Lactic Acid ◽  
Water Contact

Materials with superhydrophobic surfaces have received vast attention in various industries due to their valuable properties, such as their self-cleaning and antifouling effects. These promising superhydrophobic properties are taken into high priority, particularly for medical devices and applications. The development of an ideal superhydrophobic surface is a challenging task and is constantly progressing. Various strategies have been introduced; however, a minority of them are cost-effective. This work presents a facile fabrication of the superhydrophobic surface by using graphene and titanium dioxide (TiO2) nanoparticles. The graphene and TiO2 hybrid nanoparticles are dip-coated on a biodegradable thermoplastic poly(lactic acid) (PLA) substrate. The thermoplastic PLA is approved by the Food and Drug Administration (FDA), and is widely utilized in medical devices. The graphene/TiO2 coating is substantiated to transform the hydrophilic PLA film into superhydrophobic biomaterials that can help to reduce hazardous medical-device complications. The surface wettability of the graphene/TiO2 nanoparticle-coated PLA surface was evaluated by measuring the apparent water contact angle. The surface chemical composition and surface morphology were analyzed via Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The graphene/TiO2-coated PLA film achieved superhydrophobic properties by demonstrating a water contact angle greater than 150°. The water contact angle of the graphene/TiO2 coating increased along with the concentration of the nanoparticles and the ratio of TiO2 to graphene. Moreover, the graphene/TiO2 coating exhibited excellent durability, whereby the contact angle of the coated surface remained unchanged after water immersion for 24 h. The duration of the effectiveness of the superhydrophobic coating suggests its suitability for medical devices, for which a short duration of administration is involved. This study reports an easy-to-replicate and cost-effective method for fabricating superhydrophobic graphene/TiO2-coated surfaces, which additionally substantiates a potential solution for the manufacturing of biomaterials in the future.

Preparation of SiO2 nanoparticles with adjustable size for fabrication of SiO2/PMHS ORMOSIL superhydrophobic surface on cellulose-based substrates

2020 ◽  
Vol 138 ◽  
pp. 105384 ◽  
Author(s):  
Xinxiang Zhang ◽  
Fuchuan Xiao ◽  
Qifan Feng ◽  
Jiaxian Zheng ◽  
Cuixia Chen ◽  
...  
Keyword(s):  
Superhydrophobic Surface ◽  
Sio2 Nanoparticles
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