2,903 research outputs found
Electrospun scaffolds with a controlled distribution of pores enabled by a micro-rod array collector
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Low-impedance Tetrodes using Carbon Nanotube-Polypyrrole Composite Deposition
No full textA tetrode is one of the neural electrodes, and it is widely used to record neural signals in the brain of a freely moving animal. The impedance of a neural electrode is an important parameter because it determines the signal-to-noise ratio of the recorded neuralsignals. Here, we developed a modification technique using carbon nanotube-polypyrrole composite nanostructures to decrease theimpedances of tetrodes. The synthesis of the carbon nanotube and polypyrrole nanostructures was performed in two steps. In the first step, randomly dispersed carbon nanotubes and pyrrole monomers were gathered and aligned on the tetrode electrode. Next, they were electro-polymerized on the electrode surface. As the applied time (step-1 and step-2) and the offset voltage increased, the impedances of the tetrodes decreased. The modification technique is, therefore, an important and useful of lowering the impedances of tetrodes.22kc
Fabrication of Optical Switching Patterns with Structural Colored Microfibers
No full textStructural color was generated using electrospinning and hydrothermal growth of zinc oxide (ZnO). An aligned seed layer was prepared by electrospinning, and the hydrothermal growth time control was adjusted to generate various structural colors. The structural color changed according to the angle of the incident light. When the light was parallel to the direction of the aligned nanofibers, no pattern was observed. This pattern is referred to as an "optical switching pattern." Replication using polydimethylsiloxane (PDMS) also enabled the generation of structural colors; this is an attractive approach for mass production. Additionally, the process is quite tunable because additional syntheses and etching can be performed after the patterns have been fabricated.11Ysciescopu
Bio-inspired structural colors fabricated with ZnO quasi-ordered nanostructures
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Electrical force-based continuous cell lysis and sample separation techniques for development of integrated microfluidic cell analysis system: A review
No full textCell lysis and the separation of intracellular components are key steps in the analysis of intracellular components. Advances in micro-electro-mechanical system (MEMS) technologies have prompted a number of investigations into the potential applications of microfluidics to the development of cell lysis and sample separation methods. The electrical force is considered to have excellent potential for parallelizing and automating cell lysis and sample separation methods. In this review, we focus on research works related to electrical force based continuous cell lysis and sample separation techniques. We provide brief explanations of the major developed techniques and summarize their advantages and limitations with respect to their applicability as a part of integrated microfluidic cell analysis system.11Nsciescopu
Design, Analysis, and Experimental Results of Micromachined Single-structure Triaxis Vibratory Gyroscope with Advanced Coupling Mechanism
No full textIn this work, a novel micromachined monolithic triaxis gyroscope with an advanced anchor mechanism is designed and its structural characteristics are analyzed. Micromachined gyroscopes are usually packed in small packages, causing a high squeeze film damping effect that reduces the quality factor of out-of-plane vibration, resulting in lowered out-of-plane sensitivity. The proposed gyroscope has a four-mass single structure wherein the opposing masses vibrate in the opposite direction perpendicular to the direction they face, with the help of 'tree-shaped' coupling springs. The simulated driving and x-, y-, and z-axis sensing resonant frequencies are 19946, 20227, 20294, and 20361 Hz, respectively. Also, the prototype of the gyroscope was fabricated and tested. It showed a driving Q-factor of 106 and a scale factor of 7 mV/deg/s.11Ysciescopu
Fabrication of stretchable micro/nano core-shell fibers with near field electrospinning
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Junction-free Flat Copper Nanofiber Network-based Transparent Heater with High Transparency, High Conductivity, and High Temperature
No full textTransparent conducting electrodes (TCE) are widely used in a variety of applications including displays, light-emitting diodes (LEDS), and solar cells. An important factor in TCE design is active control of the sheet resistance and transparency; as these are inversely proportional, it is essential to develop a technology that can maintain high transparency, while actively controlling sheet resistance, for a range of applications. Here, a nanofiber network was fabricated based on direct electrospinning onto a three-dimensional (3-D) complex substrate; flat metal electrodes without junction resistance were produced using heat treatment and electroless deposition. The fabricated transparent electrode exhibited a transparency of over 90% over the entire visible light range and a sheet resistance of 4.9 ohms/sq. Adhesion between the electrode and substrate was superior to other electrospinning-based transparent electrodes. The performance of the transparent electrode was verified by measurements taken while using the electrode as a heater; a maximum temperature of 210 degrees C was achieved. The proposed copper nanofiber-based heater electrode offers the advantages of transparency as well as application to complex 3-D surfaces.11Ysciescopu
A three-dimensional scaffold for enhanced cell distribution and infiltration using elastic deformation
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