Durable superhydrophilic coatings formed for anti-biofouling and oil–water separation

Lin, Xiangde; Yang, Miso; Jeong, Hyejoong; Chang, Minwook; Hong, Jinkee

doi:10.1016/j.memsci.2016.01.035

Cited by 73 publications

(23 citation statements)

References 40 publications

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“…Numerous studies have focused on the control of wettability of real surfaces, which can be divided into hydrophilicity and hydrophobicity according to the contact angle (CA) [ 19 ]. Surfaces that are superhydrophobic or superhydrophilic may act as self-cleaning surfaces or be employed as antibiofouling surfaces in biomedical applications, respectively [ 20 , 21 ]. Therefore, the wettability of substrate’s surface was important to the biomedical chip application.…”

Section: Introductionmentioning

confidence: 99%

Surface Wettability and Electrical Resistance Analysis of Droplets on Indium-Tin-Oxide Glass Fabricated Using an Ultraviolet Laser System

Tsai

Hsu

et al. 2021

Micromachines

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Indium tin oxide (ITO) is widely used as a substrate for fabricating chips because of its optical transparency, favorable chemical stability, and high electrical conductivity. However, the wettability of ITO surface is neutral (the contact angle was approximately 90°) or hydrophilic. For reagent transporting and manipulation in biochip application, the surface wettability of ITO-based chips was modified to the hydrophobic or nearly hydrophobic surface to enable their use with droplets. Due to the above demand, this study used a 355-nm ultraviolet laser to fabricate a comb microstructure on ITO glass to modify the surface wettability characteristics. All of the fabrication patterns with various line width and pitch, depth, and surface roughness were employed. Subsequently, the contact angle (CA) of droplets on the ITO glass was analyzed to examine wettability and electrical performance by using the different voltages applied to the electrode. The proposed approach can succeed in the fabrication of a biochip with suitable comb-microstructure by using the optimal operating voltage and time functions for the catch droplets on ITO glass for precision medicine application. The experiment results indicated that the CA of droplets under a volume of 20 μL on flat ITO substrate was approximately 92° ± 2°; furthermore, due to its lowest surface roughness, the pattern line width and pitch of 110 μm exhibited a smaller CA variation and more favorable spherical droplet morphology, with a side and front view CA of 83° ± 1° and 78.5° ± 2.5°, respectively, while a laser scanning speed of 750 mm/s was employed. Other line width and pitch, as well as scanning speed parameters, increased the surface roughness and resulted in the surface becoming hydrophilic. In addition, to prevent droplet morphology collapse, the droplet’s electric operation voltage and driving time did not exceed 5 V and 20 s, respectively. With this method, the surface modification process can be employed to control the droplet’s CA by adjusting the line width and pitch and the laser scanning speed, especially in the neutral or nearly hydrophobic surface for droplet transporting. This enables the production of a microfluidic chip with a surface that is both light transmittance and has favorable electrical conductivity. In addition, the shape of the microfluidic chip can be directly designed and fabricated using a laser direct writing system on ITO glass, obviating the use of a mask and complicated production processes in biosensing and biomanipulation applications.

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Section: Introductionmentioning

confidence: 99%

Surface Wettability and Electrical Resistance Analysis of Droplets on Indium-Tin-Oxide Glass Fabricated Using an Ultraviolet Laser System

Tsai

Hsu

et al. 2021

Micromachines

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“…Among many other oil-water separation techniques, membrane base separation technology is becoming much more versatile due to its simplicity, high operational efficiency, and environmental friendliness [8,9]. Different methods such as phase inversion [10,11,12], coating [13,14,15], sol-gel [16], and electrospinning [17,18,19,20,21] are being used to produce these membranes. Among all methods, electrospinning is a simple and efficient process used to produce highly porous polymer-based membranes with desirable surface chemistry and high permeation rate [22,23].…”

Section: Introductionmentioning

confidence: 99%

A Novel PAN-GO-SiO2 Hybrid Membrane for Separating Oil and Water from Emulsified Mixture

et al. 2019

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In this article, we report the development of a polyacrylonitrile-graphene oxide-silicon dioxide (PAN-GO-SiO2) hybrid membrane for separation of oil and water from their emulsified mixture. The membrane was successfully fabricated using a one-step electrospinning process. GO and SiO2 nanofillers were added in PAN in different concentrations to determine the optimized composition for the PAN-GO-SiO2 hybrid membrane. A scanning electron microscopy (SEM) examination showed that the nanofillers were uniformly embedded in the nanofibrous structure of the electrospun hybrid membrane. The GO was mainly embedded inside the PAN nanofibers, causing knots while SiO2 nanoparticles were found embedded on the nanofiber surface, resulting in the formation of micro-nano protrusions on the fiber surface. The formation of these hierarchical structures, together with enhanced hydrophilicity due to oxygen containing groups on both SiO2 and GO, resulted in a high rejection (>99%) of oil from oil-water emulsion. Membrane performance evaluation under gravity separation tests showed that the separation flux and phase rejection was enhanced with the incorporation of nanofillers. The inclusion of nanofillers also enhanced the mechanical properties of the membrane. The best flux and phase separation performance was obtained for an optimized concentration of 7.5 wt % SiO2 and 1.5 wt % GO in PAN. The flux of separated water was enhanced from 2600 L m−2 h−1 for pristine PAN to 3151 L m−2 h−1 for PAN-GO-SiO2. The hybrid membrane also showed good mechanical and chemical stability, and antifouling propensity.

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“…Thus, highly hydrophilic coatings provide a simple method to repel bacteria; consequently, different coatings of this kind have been explored in the last few years. Examples that can be cited are the development of superhydrophilic zeolites that were prepared as coating on titanium alloy surface and were revealed as an effective method to avoid bacteria attachment with a potential application in orthopedic implants [42], or superhydrophilic coatings constructed as a multilayer assembled by H-bonding between hydrophilic branched poly(ethylenimine) and poly(urethane acrylate) mixed with silica nanoparticles [43].…”

Section: Hydrophylic Surfacesmentioning

confidence: 99%

Antibacterial Coatings for Improving the Performance of Biomaterials

et al. 2020

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Biomedical devices have become essential in the health care. Every day, an enormous number of these devices are used or implanted in humans. In this context, the bacterial contamination that could be developed in implanted devices is critical since it is estimated that infections kill more people than other medical causes. Commonly, these infections are treated with antibiotics, but the biofilm formation on implant surfaces could significantly reduce the effectiveness of these antibiotics since bacteria inside the biofilm is protected from the drug. In some cases, a complete removal of the implant is necessary in order to overcome the infection. In this context, antibacterial coatings are considered an excellent strategy to avoid biofilm formation and, therefore, mitigate the derived complications. In this review, the main biomaterials used in biomedical devices, the mechanism of biofilm formation, and the main strategies for the development of antibacterial coatings, are reviewed. Finally, the main polymer-based strategies to develop antibacterial coatings are summarized, with the aim of these coatings being to avoid the bacteria proliferation by controlling the antibacterial mechanisms involved and enhancing long-term stability.

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Durable superhydrophilic coatings formed for anti-biofouling and oil–water separation

Cited by 73 publications

References 40 publications

Surface Wettability and Electrical Resistance Analysis of Droplets on Indium-Tin-Oxide Glass Fabricated Using an Ultraviolet Laser System

Surface Wettability and Electrical Resistance Analysis of Droplets on Indium-Tin-Oxide Glass Fabricated Using an Ultraviolet Laser System

A Novel PAN-GO-SiO2 Hybrid Membrane for Separating Oil and Water from Emulsified Mixture

Antibacterial Coatings for Improving the Performance of Biomaterials

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