Fabrication of polymer electronic boards by ultrasonic embossing and welding

A method has been developed allowing fabrication of electronic boards from flexible polymer film by ultrasonic embossing and welding within seconds. A commercially available ultrasonic welding machine and micro patterned tools from aluminum are employed first to generate conductor paths on a flexible polymer film, in a further step, surface mounted devices are assembled and fixed on the flexible polymer film by a lid, and meanwhile electrical connected via a z axis conductive tape, both the molding of the lid and the bonding between the lid and electronic boards are implemented on an ultrasonic welding machine. Finally, the effectiveness of electrical interconnection is investigated at elevated temperature, humidity and bending load, exemplified by three simple circuit boards assembled with light-emitting diodes and resistors and capacitor separately, and the experimental results show that the electrical interconnection is effective, stable, and durable

Experimental and modeling means for analysis and replication periodical microstructures

Precise microstructures find their application in various areas: laser industry; electronic, microfluidic devices. There are several processes for production of precise periodic microstructures. One of these processes is hot imprint, on the other hand there are many challenges, related with quality of microstructure. One of the solutions for the quality issues is exploitation of ultrasonic excitation during the process of mechanical hot imprint. In the paper analytical measures and analysis algorithms for the measurement of quality parameters of already created microstructure, as well for dynamic analysis of created vibroactive pad are presented. In the end of the paper vibroactive pads are experimentally analysed using already discussed equipment and measuring algorithms, in order to find out their operating frequencies

Experimental and modeling means for analysis and replication periodical microstructures

Precise microstructures find their application in various areas: laser industry; electronic, microfluidic devices. There are several processes for production of precise periodic microstructures. One of these processes is hot imprint, on the other hand there are many challenges, related with quality of microstructure. One of the solutions for the quality issues is exploitation of ultrasonic excitation during the process of mechanical hot imprint. In the paper analytical measures and analysis algorithms for the measurement of quality parameters of already created microstructure, as well for dynamic analysis of created vibroactive pad are presented. In the end of the paper vibroactive pads are experimentally analysed using already discussed equipment and measuring algorithms, in order to find out their operating frequencies

Experimental and modeling means for analysis and replication periodical microstructures

Precise microstructures find their application in various areas: laser industry; electronic, microfluidic devices. There are several processes for production of precise periodic microstructures. One of these processes is hot imprint, on the other hand there are many challenges, related with quality of microstructure. One of the solutions for the quality issues is exploitation of ultrasonic excitation during the process of mechanical hot imprint. In the paper analytical measures and analysis algorithms for the measurement of quality parameters of already created microstructure, as well for dynamic analysis of created vibroactive pad are presented. In the end of the paper vibroactive pads are experimentally analysed using already discussed equipment and measuring algorithms, in order to find out their operating frequencies

Acoustic and Elastic Waves: Recent Trends in Science and Engineering

The present Special Issue intends to explore new directions in the field of acoustics and ultrasonics. The interest includes, but is not limited to, the use of acoustic technology for condition monitoring of materials and structures. Topics of interest (among others): • Acoustic emission in materials and structures (without material limitation) • Innovative cases of ultrasonic inspection • Wave dispersion and waveguides • Monitoring of innovative materials • Seismic waves • Vibrations, damping and noise control • Combination of mechanical wave techniques with other types for structural health monitoring purposes. Experimental and numerical studies are welcome

Low-Cost Light Trapping Layer via Melting Gel and Hot Embossing Technique

Light trapping plays a phenomenal role in enhancing light confinement and light absorption within the solar cells, thus increasing the optical efficiency of the cell. Different strategies are employed for trapping light photons within the cell. Methods used include a substrate or single layer texturing, light trapping coating, plasmonic gratings, nano and microwires, Nano domes, photonic crystals, and aggregates nanocrystalline. Nowadays, a hybrid glass coating made by melting gel through the so-gel process attracts people's attention. Melting gels are a kind of organic-inorganic hybrids silica gel, which are rigid at room temperature and become soft around 110℃. One can soften the melting gel many times until the gel is heat up to its consolidation temperature, at which the gel is permanently solidified. The study is focused on using 50 mol % MTES-50 mol % DMDES melting gel to produce a textured gel coating via wet-etched silicon mold and hot embossing technique, and then characterize the coating layer by using Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), FT-IR Spectroscopy (FT-IR), Ultra-Violet Visible and Near-Infrared (UV-Vis-NIR) Spectrophotometry with an Integrating Sphere. The results show that the textured gel coating might be used as a light-trapping layer to be applied on halide perovskite solar cells as a protection layer