scholarly journals Low-Cost Laser Micromachining Super Hydrophilic–Super Hydrophobic Microgrooves for Robotic Capillary Micromanipulation of Microfibers

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 854
Author(s):  
Bo Chang ◽  
Yuhang Feng ◽  
Jialong Jin ◽  
Quan Zhou
Keyword(s):  
Low Cost ◽  
Scanning Speed ◽  
Laser Micromachining ◽  
Liquid Droplets ◽  
Material Development ◽  
Wetting Properties ◽  
Receptor Sites ◽  
Alignment Technique ◽  
Manufacturing Parameters ◽  
Microsecond Pulse

Capillary self-alignment technique can achieve highly accurate and fast alignment of micro components. Capillary self-alignment technique relies on the confinement of liquid droplets at receptor sites where hydrophobic–hydrophilic patterns are widely used. This paper reports a low-cost microsecond pulse laser micromachining method for fabrication of super hydrophilic–super hydrophobic grooves as receptor sites for capillary self-alignment of microfibers. We investigated the influence of major manufacturing parameters on groove sizes and wetting properties. The effects of the width (20 µm–100 µm) and depth (8 µm–36 µm) of the groove on the volume of water droplet contained inside the groove were also investigated. We show that by altering scanning speed, using a de-focused laser beam, we can modify the wetting properties of the microgrooves from 10° to 120° in terms of the contact angle. We demonstrated that different types of microfibers including natural and artificial microfibers can self-align to the size matching super hydrophilic–super hydrophobic microgrooves. The results show that super hydrophilic–super hydrophobic microgrooves have great potential in microfiber micromanipulation applications such as natural microfiber categorization, fiber-based microsensor construction, and fiber-enforced material development.

scholarly journals Effect of Process Parameters and Material Properties on Laser Micromachining of Microchannels

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 123 ◽  
Author(s):  
Matthew Benton ◽  
Mohammad Hossan ◽  
Prashanth Konari ◽  
Sanjeewa Gamagedara
Keyword(s):  
Process Parameters ◽  
Laser System ◽  
Three Dimensional ◽  
Microfluidic Devices ◽  
Scanning Speed ◽  
Transient Heat Conduction ◽  
Laser Micromachining ◽  
Rapid Phase ◽  
Widespread Application ◽  
Optimization Of Process Parameters

Laser micromachining has emerged as a promising technique for mass production of microfluidic devices. However, control and optimization of process parameters, and design of substrate materials are still ongoing challenges for the widespread application of laser micromachining. This article reports a systematic study on the effect of laser system parameters and thermo-physical properties of substrate materials on laser micromachining. Three dimensional transient heat conduction equation with a Gaussian laser heat source was solved using finite element based Multiphysics software COMSOL 5.2a. Large heat convection coefficients were used to consider the rapid phase transition of the material during the laser treatment. The depth of the laser cut was measured by removing material at a pre-set temperature. The grid independent analysis was performed for ensuring the accuracy of the model. The results show that laser power and scanning speed have a strong effect on the channel depth, while the level of focus of the laser beam contributes in determining both the depth and width of the channel. Higher thermal conductivity results deeper in cuts, in contrast the higher specific heat produces shallower channels for a given condition. These findings can help in designing and optimizing process parameters for laser micromachining of microfluidic devices.

Microstructure and Characteristic of Biomedical Titanium Alloy Based on Picosecond Laser Micromachining

2018 ◽  
Vol 939 ◽  
pp. 104-109
Author(s):  
Zhou Yu ◽  
Jun Hu
Keyword(s):  
Titanium Alloy ◽  
Specific Surface ◽  
Picosecond Laser ◽  
Scanning Speed ◽  
Laser Micromachining ◽  
Endothelial Cell Culture ◽  
Surface Textures ◽  
Tc4 Titanium Alloy ◽  
Biomedical Titanium Alloy ◽  
Cell Adhesion And Proliferation

Laser micromachining has become a hotspot in recent years due to its high precision, non-contact and adjustable parameter. In this paper, TC4 titanium alloy implant samples were conducted to obtain specific surface textures through picosecond laser. The laser parameters which directly influenced the microstructure and characteristic of surface textures were optimized within the context of laser power, scanning speed and scanning number via response surface methodology. The microstructure was evaluated using scanning electron microscope (SEM) while the feature size of the surface textures was measured through surface 3D profiler. In addition, endothelial cell culture was conducted to investigate the biofunctionalization of samples with specific surface textures. It demonstrated that well-structured textures played an important role in promoting cell adhesion and proliferation for titanium alloy implants.

scholarly journals The wetting properties of frosted glass

2021 ◽  
Vol 13 ◽  
pp. 130006
Author(s):  
Stéphane Dorbolo
Keyword(s):  
Contact Angle ◽  
Optical Properties ◽  
Silicone Oil ◽  
Low Cost ◽  
Contact Angle Hysteresis ◽  
Water Droplets ◽  
Capillary Length ◽  
Wetting Properties ◽  
Travel Distances ◽  
Frosted Glass

Frosted glass is a common, low cost material. Its roughness can be used to control how it is wet by water. In this paper, the wetting properties of silicone oil and water are investigated. For the oil, wetting is total since the oleophilic character of the glass is enhanced by its roughness. Due to the remarkable optical properties of frosted glass, the spreading of oil droplets on its surface was recorded over three months. Frosted glass is a parahydrophilic surface because of its large contact angle hysteresis (up to 80° ). The behaviour of oil and water droplets was compared on a long piece of inclined frosted glass. The trajectories (and the spreading) of the droplets were studied and phenomenological laws were deduced to describe the dependence of the droplet speed on the initial volume of the droplet and the angle of inclination. Such dependences of speed at long travel distances (100 times the capillary length) were deduced and rationalised with a simple model that takes into account the thickness of the wake. Moreover, we analysed the flow inside the wake of water droplets sliding on inclined frosted glass. Suggestions are given on how to exploit drainage of the water droplet wake and the high hysteresis of water within the framework of open microfluidics.

Biodegradation or simple adsorption to the support material? Development of a simple, fast and low-cost technique

2013 ◽  
Vol 185 (12) ◽  
pp. 10085-10089
Author(s):  
R. Maurício ◽  
L. Amaral ◽  
P. Santos Coelho ◽  
F. Santana
Keyword(s):  
Low Cost ◽  
Support Material ◽  
Material Development

Low-cost 10-gb/s optical receiver module using a novel plastic package and a passive alignment technique

2005 ◽  
Vol 23 (12) ◽  
pp. 4257-4264 ◽  
Author(s):  
T. Kurosaki ◽  
Y. Shuto ◽  
T. Tadokoro ◽  
K. Yokoyama ◽  
Jun Endo ◽  
...  
Keyword(s):  
Low Cost ◽  
Optical Receiver ◽  
Plastic Package ◽  
Alignment Technique ◽  
Receiver Module ◽  
Passive Alignment

scholarly journals Superhydrophobic paper with mussel-inspired polydimethylsiloxane–silica nanoparticle coatings for effective oil/water separation

RSC Advances ◽  
2020 ◽  
Vol 10 (14) ◽  
pp. 8008-8015 ◽  
Author(s):  
Xuewei Ruan ◽  
Tiancheng Xu ◽  
Dingjiang Chen ◽  
Ziwen Ruan ◽  
Haitu Hu
Keyword(s):  
Low Cost ◽  
Silica Nanoparticle ◽  
Water Separation ◽  
Wetting Properties ◽  
Oil Water Separation ◽  
Oil Water ◽  
Nanoparticle Coatings ◽  
Superhydrophobic Paper

Although various filtration materials with (super)wetting properties have been fabricated for effective oil/water separation, eco-friendly and low-cost materials are still highly desired.

scholarly journals PVP-Assisted Shellac Nanofiber Membrane as Highly Efficient, Eco-Friendly, Translucent Air Filter

2021 ◽  
Vol 11 (23) ◽  
pp. 11094
Author(s):  
Shanshuai Lu ◽  
Congling Li ◽  
Rui Liu ◽  
Aifeng Lv
Keyword(s):  
Mechanical Properties ◽  
Low Cost ◽  
Light Transmittance ◽  
Liquid Droplets ◽  
Air Filtration ◽  
Nanofiber Membrane ◽  
Air Filters ◽  
Air Filter ◽  
Highly Efficient ◽  
Pm2.5 And Pm10

Particulate matter (PM), composed of tiny solids and liquid droplets in polluted air, poses a serious threat to human health. Traditional air filters usually cause secondary pollution due to their poor degradability. Here, shellac, as an environmentally friendly natural organic material, was successfully applied to fabricate biodegradable air filters. Since pure shellac fiber shows poor mechanical properties and bad light transmittance, we then introduced a small amount of polyvinylpyrrolidone (PVP) in the shellac solution to prepare highly efficient air filter membranes by the electrospinning method. The prepared PVP-assisted shellac nanofiber membrane (P-Shellac FME) demonstrated improved filtration efficiencies as high as 95% and 98% for PM2.5 and PM10, respectively. The P-Shellac FME also showed good stability, with filtration efficiencies still above 90% and 95% for PM2.5 and PM10 even after six hours of air filtering under high PM concentrations. The pressure drop going through the filter was only 101 Pa, which is also comparable to the value of 76 Pa obtained using commercial polypropylene nanofibers (PP nanofibers, peeled off from the surgical mask), indicating good air permeability of P-Shellac FME. Additionally, P-Shellac FME also showed the advantages of translucence, biodegradability, improved mechanical properties, and low cost. We believe that the P-Shellac FME will make a significant contribution in the application of air filtration.

scholarly journals Effects of various processing parameters on the mechanical properties of sisal fiber/PES composites produced via selective laser sintering

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5710-5724
Author(s):  
Aboubaker I. B. Idriss ◽  
Jian Li ◽  
Yangwei Wang ◽  
Yanling Guo ◽  
Elkhawad A. Elfaki
Keyword(s):  
Mechanical Strength ◽  
Laser Power ◽  
Low Cost ◽  
Selective Laser Sintering ◽  
Scanning Speed ◽  
Processing Parameters ◽  
Laser Sintering ◽  
Sisal Fiber ◽  
Preheating Temperature ◽  
Scan Speed

A new type of sustainable material, i.e., a sisal fiber/poly-ether sulfone composite (SFPC), which is energy-efficient, environmentally friendly, and has a low cost, was developed for laser sintering additive manufacturing. This study was performed to explore the effects of the processing parameters on the SFPC composite parts produced via selective laser sintering (SLS). The effects of the laser sintering processing parameters, i.e., the preheating temperature, laser power, and scan speed, were studied. Bending and tensile testing of the SFPC specimens was successfully performed via SLS. The effect of the processing parameters on the SLS in terms of the mechanical strength of the laser-sintered parts was investigated. The results determined that the processing parameters had a significant effect on the mechanical strength of the sintered SFPC parts. When the preheating temperature and laser power were increased in the processing SLS system, the mechanical strength of the sintered SFPC parts was significantly increased. However, the scanning speed had an inverse proportional relationship to the mechanical strength of the SFPC SLS parts.

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