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- 摘要
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- 实验方案
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Slippery Surface Based on Photoelectric Responsive Nanoporous Composites with Optimal Wettability Region for Droplets' Multifunctional Manipulation
摘要： The development of responsive slippery surfaces is important because of the high demand for such materials in the fields of liquid manipulation on biochips, microfluidics, microreactions, and liquid-harvesting devices. Although great progress has been achieved, the effect of substrate wettability on slippery surfaces stability is overlooked by scientists. In addition, current responsive slippery surfaces generally function utilizing single external stimuli just for imprecisely controlling liquid motion, while advanced intelligences are always expected to be integrated into one smart interface material for widespread multifunctional applications. Therefore, designing slippery surfaces that collaboratively respond to complex external stimuli and possess sophisticated composite function for expanding applications from controlling droplets motion to patterned writing is urgently needed but remains a challenge. Here, a photoelectric cooperative-responsive slippery surface based on ZnO nanoporous composites is demonstrated. First, the effect of composite surface wettability on slippery surface stability is systematically researched and the optimum wettability region for fabricating stable slippery surfaces is determined. Furthermore, controllable droplet motion and patterned writing are realized on the same slippery surfaces under photoelectric cooperative stimuli, and the related response mechanism is also deeply studied. This kind of material has potential applications in biochips, microfluidics, in situ patterning, and water-harvesting systems.
关键词： droplet motion,slippery surfaces,wettability region,photoelectric cooperative,patterned writing
更新于2025-09-10 09:29:36
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[Ceramic Transactions Series] Ceramics for Environmental Systems (Ceramic Transactions, Volume 257) || Development of Microtextured Titanium Dioxide Surface by Using Microcutting Techniques
摘要： TiO2 possesses photocatalytic functions, even though they are relatively weak and required further enhancements for wider practical usages. On the other hand, improving materials surface functions by introducing surface textures is of great interest in various fields. This study aims to develop a high-functional photocatalytic surface by increasing the real surface area with the support of microcutting techniques. In this work, pure Ti plates, which was covered with numerous fine grooves fabricated by the microcutting and vibration-assisted microcutting techiniques, were anodized to obtain various regularly microtextured TiO2 film surfaces. Their wettabilties were examined to evaluate their photocatalitic potential. As a result, it is found that the wettability of the TiO2 film surfaces of regularly textured are superior to that of the mirror finished one under an ultraviolet rays irradiation environment.
关键词： anodic oxidation,microcutting,vibration-assisted microcutting,TiO2,wettability,photocatalytic
更新于2025-09-10 09:29:36
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Numerical Demonstration of In-Tube Liquid-Column Migration Driven by Photoisomerization
摘要： Droplet manipulation by light-induced isomerization was numerically demonstrated and investigated regarding the driving mechanism. Such a non-invasive manipulation of a droplet in a microchannel can be realized, for example, by the use of watery solution of photoresponsive surfactant that exhibits the isomerization. Due to variable fluid properties between the cis and trans isomers, one-side light irradiation on a liquid column in a tube would lead to some kind of imbalance between the two ends of the liquid column and then drive droplet migration. The present numerical simulations of air–liquid two-phase flow and its scalar transport of the isomer, considering the variable static contact angle, agreed quantitatively with the experimental results in terms of the migration speed. This fact supports the contention that the droplet migration is more likely to be driven by an imbalance in the wettability, or the contact angle. The migration speed was found to be less dependent on the liquid-column length, but proportional to the tube diameter.
关键词： photochemical reaction,non-invasive control,wettability,surface tension,microfluidics,computational fluid dynamics,lab-on-a-chip,droplet manipulation,two-phase flow,photoresponsible surfactant
更新于2025-09-09 09:28:46
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Photo-control of poly(N-[4-[(4-Nitrophenyl)azo]phenyl]acrylamide) brushes on graphene oxide coated silicon surface
摘要： Poly(N-[4-[(4-Nitrophenyl)azo]phenyl]acrylamide [poly(NPAPAA)] brushes were obtained via interface-mediated reversible addition–fragmentation chain transfer polymerization to design new photoresponsive surface on the graphene oxide coated silicon substrate. Switchable surface wettability was controlled successfully by these densely packed polymer brushes using light as the exterior stimulation. The relatively nonpolar trans azobenzene polymer brushes were converted to a polar cis form (with a larger dipole moment) utilizing light of the suitable wavelength. This conversion is reversible and can be switched back by employing visible light. Cis–trans photo-induced isomerization provided a reversible contact angle change (~ 9o) with UV and visible light for the poly(NPAPAA) brushes under successive irradiation cycles. This study may be promised to control cell culture surface without leaving any residual in terms of alternative medicine.
关键词： Interface-mediated RAFT polymerization,Photoresponsive polymer brushes,Switchable surface wettability
更新于2025-09-09 09:28:46
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Graphene-Oxide and Hydrogel Coated FBG-Based pH Sensor for Biomedical Applications
摘要： A hydrogel coated fibre grating-based pH sensor for biomedical applications has been realised, where Graphene Oxide (GO) had been used to enhance the bonding between the coating and the fibre. Two methods of deposition of GO were analysed i.e., evaporation and co-electroplating. The paper concludes that the system of GO evaporated on the fibre + the hydrogel has a sensitivity much higher, (6.1 ± 0.5) pm/pH, than the system of Cu and GO co-electroplated + the hydrogel, (1.9 ± 0.1) pm/pH, for a pH range between 2 to 10. The other conclusion is that the first system has a less coating bonding energy with the optical fibre whereas the second system has a stronger bonding energy, with better durability.
关键词： FBG,surface functionalisation,pH,sensing,fibre optic,biomedical application,roughness,graphene oxide,wettability,GO
更新于2025-09-04 15:30:14
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Influence of indium addition on wetting characteristics of Sn-3Ag-0.5Cu solder alloy on Cu substrate
摘要： This work investigates the effect of Indium (In) addition, 0.5 wt.% In, on the wettability of the Sn–3Ag–0.5Cu (SAC305) ternary pb-free solder alloy. Adding In to SAC305 decreased the contact angles (θ) of the Sn-2.5Ag-0.5Cu-0.5In quaternary pb-free solder alloy decreased which were measured by using of the sessile drop method at various temperatures (250, 280 and 310 °C) on Cu substrate in Ar atmosphere. Microstructures, inter-metallic phases, and melting temperatures of alloys were characterized by optic microscope and scanning electron microscope and energy dispersive X-ray spectroscopy, X-ray diffraction, and differential scanning calorimeter, and effects of the amount of In on microstructure were investigated. The results indicated that when the addition of In was 0.5 wt.%, the change in melting temperature of Sn–2.5Ag-0.5Cu–0.5In solder was negligible, but the contact angles (θ) of the solder alloy decreased which were measured by using of the sessile drop method at various temperatures. The lowest θ was obtained as 45.22° for Sn–2.5Ag-0.5Cu– 0.5In alloy at 310 °C. The formation of intermetallic compounds (IMC) between the Pb-free solder alloys and the Cu substrate was observed. Thus, If the amounts of indium and silver are optimized, the Sn-2Ag-0.5Cu-0.5In quaternary solder alloy may be a suitable potential candidate to replace conventional Sn-3.0Ag-0.5Cu solder to provide economic gain in solder alloy production.
关键词： Indium addition,Sn-3Ag-0.5Cu solder alloy,Cu substrate,wettability,intermetallic compounds
更新于2025-09-04 15:30:14
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[Micro/Nano Technologies] Micro and Nano Fabrication Technology Volume 1 || Micro Milling for Functional Surface
摘要： Micro manufacturing has recently increased in the several ?elds that include optics, electronics, medicine, biotechnology, and communications. Then, drastic progresses have been seen in the micro milling with the technologies in micro/nano-scale measurement, control, and tooling. This chapter describes the micro milling for manufacturing of the functional surfaces, which control material behavior with the surface topography. In the introduction, the current technical status in the functional surfaces is reviewed with the micro fabrication processes, and some issues in the micro milling are described to achieve high qualities of the micro elements and structures on the surfaces. Then, the typical micro milling process is discussed in terms of the operations and the removal process. Regarding material behavior, the effect of crystal grain size and orientation on the removal process becomes relatively large. When the grain size reduces, the dynamic components in the cutting force, burr formation, and affected layer can be controlled in micro cutting. Micro milling is applied to manufacture the functional surfaces with the micro dimples at high machining rates. The micro dimples are machined in milling with the inclined spindle at 45(cid:1). The milling with the cutter axis inclination is also applied to machine the micro dimples on the cylinder surfaces. A mechanistic model is applied to control the dimple shape for the cutting parameters, the feed direction, and the tool geometry. The surfaces with the micro dimples are applied to control the surface functions such as optical re?ection and wettability.
关键词： Surface function,Micro milling,Micro dimple,Wettability,Mechanistic model,Fine grained steel,Optical control
更新于2025-09-04 15:30:14
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Creation of Superhydrophobic and Superhydrophilic Surfaces on ABS Employing a Nanosecond Laser
摘要： A nanosecond green laser was employed to obtain both superhydrophobic and superhydrophilic surfaces on a white commercial acrylonitrile-butadiene-styrene copolymer (ABS). These wetting behaviors were directly related to a laser-induced superficial modification. A predefined pattern was not produced by the laser, rather, the entire surface was covered with laser pulses at 1200 DPI by placing the sample at different positions along the focal axis. The changes were related to the laser fluence used in each case. The highest fluence, on the focal position, induced a drastic heating of the material surface, and this enabled the melted material to flow, thus leading to an almost flat superhydrophilic surface. By contrast, the use of a lower fluence by placing the sample 0.8 μm out of the focal position led to a poor material flow and a fast cooling that froze in a rugged superhydrophobic surface. Contact angles higher than 150? and roll angles of less than 10? were obtained. These wetting behaviors were stable over time.
关键词： superhydrophilic,superhydrophobic,surface wettability,nanosecond laser surface modification,ABS (Acrylonitrile-Butadiene-Styrene)
更新于2025-09-04 15:30:14