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Ag release from sputtered Ag/a:C nanocomposite films after immersion in pure water and NaCl solution
摘要： Diamond-like carbon (DLC) coatings doped with Ag nanoparticles are promising materials for several application, as, for example, a biomaterial. In addition to their numerous properties, when doped with silver, DLCs can acquire antibacterial properties. In this study, Ag/a:C films were deposited by unbalanced magnetron sputtering. The dimension and distribution of silver nanoparticles in the carbon matrix were characterized before and after immersion in different liquid environments, ultra-pure water and NaCl (0.9%). Inductively coupled plasma-optical emission spectroscopy was used to quantify the Ag ions released from the film. Based on the aspect of Ag nanoparticles on the films surface, suggested by atomic force microscopy analysis, scanning electron microscopy was performed to access the dimension and the distribution of the nanoparticles at the surface and, then, to calculate the mass of Ag in the film, before and after exposure to both liquids. Agglomeration and coalescence of the nanoparticles in the film surface were studied and information about the segregation from the bulk to the surface was achieved, also confirmed by X-ray photoelectron spectroscopy analysis.
关键词： Coalescence,Sputtering,Ions released,Silver,Particles,Segregation,Amorphous carbon
更新于2025-09-04 15:30:14
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Light-actuated droplets coalescence and ion detection on the CAHTs-assisted superhydrophobic surface
摘要： Coalescence and mixing of the complex chemical reagents on the droplet-based open micro?uidics are considered to be critical steps for the sample processing and the follow-up reactions and chromogenic/?uorescence analyses. Recently, using the light to actuate the droplets coalescence has been demonstrated to be able to create the ?exible, precise and high-throughput optical droplet-based reaction/analysis platforms. Particularly, the photothermal e?ect, which is one of the ?uid-light interactions, is promising in the droplets coalescence by the light-induced phase change. In present study, a contact angle hypothesis traps (CAHTs)-assisted optical droplet-based reaction/analysis platform was developed. With the triple-phase contact line extension caused by the light-heating induced wetting transition, the coalescence of two neighboring droplets on the CAHTs was induced to facilitate the rapid mixing and detection. It was also con?rmed that with the o?-center light heating, the orientable extension of the irradiated droplet was realized, which could increase the critical CAHTs gap required for the occurrence of the droplets coalescence. With the developed platform, an ion detection by processing a chromogenic reaction was presented as a proof of concept. It is believed that this concept has the signi?cant potential in many applications, including biomedicine, pharmacy, clinical diagnosis and chemosynthesis.
关键词： Ion detection,Superhydrophobic surface,Contact angle hypothesis traps,Photothermal e?ect,Droplets coalescence,Orientable extension
更新于2025-09-04 15:30:14
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Controlling shedding characteristics of condensate drops using electrowetting
摘要： We show here that ac electrowetting (ac-EW) with structured electrodes can be used to control the gravity-driven shedding of drops condensing onto ?at hydrophobic surfaces. Under ac-EW with straight interdigitated electrodes, the condensate drops shed with relatively small radii due to the ac-EW-induced reduction of contact angle hysteresis. The smaller shedding radius, coupled with the enhanced growth due to coalescence under EW, results in an increased shedding rate. We also show that the condensate droplet pattern under EW can be controlled, and the coalescence can be further enhanced, using interdigitated electrodes with zigzag edges. Such enhanced coalescence in conjunction with the electrically induced trapping effect due to the electrode geometry results in a larger shedding radius, but a lower shedding rate. However, the shedding characteristics can be further optimized by applying the electrical voltage intermittently. We ?nally provide an estimate of the condensate volume removed per unit time in order to highlight how it is enhanced using ac-EW-controlled dropwise condensation.
关键词： condensate drops,coalescence,shedding characteristics,hydrophobic surfaces,electrowetting
更新于2025-09-04 15:30:14