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Microwave absorbing characteristics of composites filled with carbon nanotubes (CNTs), including the laminar composite with different thickness, is investigated in detail. The filler used for the absorbent is CNTs and the matrix is polyester. The absorbing curves display obvious absorbability, which measuring frequency-band extend from 8~18 GHz. But comparative experiments show that the absorbing...
Aluminum isopropoxide (AIP) is an important precursor in preparing high-purity and nano-alumina. The iron impurity in AIP has bad effect on the application of nano-alumina. In order to prepare the iron-free AIP, chelate organic ligand is added to this reaction system together with Al and isopropanol to form the high boiling point complex of the iron impurity in AIP by chelation. It has been revealed...
The SrAl2O4: Eu2+, Dy3+ phosphor nanoscale powders with high brightness were prepared by a nano-coating process. The resulted SrCO3@ Al2O3 core-shell precursors were characterized by transmission electron microscope (TEM), which indicates that the precursor particles have narrow size distribution. The structure and optical properties of the phosphor powders were investigated systematically by means...
There are serial structuring methods invented or used for the fabrication of nano structures. However, there is an urgent need for innovative processing technologies, including hybrid methods across multiple energetic domains, and three-dimensional imaging and fabrication technologies such as ultrasonics. This paper shows a novel method of nano island lithography to shape hemispherically islands of...
This paper presents the fabrication of a micro droplet ejector for the application of digital printing system. The ejector makes the ink droplets of approximately 80 squaremum diameter on demand. The ejecting system is the type of face-shooter. The method of actuating membrane is bending mode using d31 of PZT. The size of ejector is 27.6 mm x 27.75 mm x 1.1 mm, and the pitch between nozzles is 2.54...
The standard application of atomic force microscope (AFM) is observation with subnanometer resolution. As development of nano-tech, AFM has also become popular as a simple manipulation tool. We have proved that developing a haptic user interface (HUI) can significantly improve these functions of AFM. When going on observation, under the assistance of HUI, the user can not only observe surface characters...
The theory, design, fabrication and measurements of a novel structure for measuring the power of microwave signals are presented based on MEMS technology. The advantage of this sensor is that it measures the microwave power coupled from the CPW line by the MEMS membrane. In this method the signal is available during the power detection. The fabrication of the novel power sensor is fully compatible...
The reduction in dimensions of biochip arrays is of interest only if the size of the spots containing DNA or proteins is kept uniform. This condition is necessary to properly compare fluorescence signals from the different spots and thus to validate the results. Toward this aim, we propose a fully automated MEMS-based spotter enabling the spatial positioning of the depositing cantilever array and...
5SPE (Solid phase extraction) method, which is compatible with MEMS (micro-electro-mechanical system) technology, has proven efficient and amenable to microfluidic chips. An SPE microfluidic chip for DNA extraction by using porous silicon dioxide as the solid phase matrix has been developed. Porous matrix coated on the wall of the channel in the microfluidic chip to provide a surface-enlarging matrix,...
A novel room temperature synthesis of carbon nanotubes (CNTs) by liquid phase deposition of methanol is firstly reported. Nanotube samples were characterized with field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and Raman spectroscopy. FESEM micrographs revealed that nanotubes with diameter in the range of 20-200 nm were grown at room temperature. HR-TEM...
Nanoparticles are difficult to remove because it is much more difficult to deliver the necessary force to smaller dimensions. We investigate in this paper a new method using micro-droplet spray to remove nanoparticles from solid flat surface. With a droplet diameter between 50 and 100 mum, we evaluate the lift force and drag force acting on spherical particles. The particle diameter is less than 100...
The current real-time PCR (polymerase chain reaction) platforms, which can detect and quantify several target DNA simultaneously, are equipped with discrete optics and detectors for different fluorescence wavelengths. However, the optical loss, due to the different lengths of the channels for several dyes, lowers the performance of fluorescence detection. Especially on the PCR platforms of lab-on-a-chip...
Electrospinning is a straightforward and effective technique to produce nanofiber nonwovens. In this paper, a comb ionomer of poly(ethylene covinyl alcohol) end-capped with sulfonic acid (EVOH-g-SO 3H) was synthesized by two-step synthesis process and electrospun into nonwoven membranes. The effect of processing parameters on the fibrous and beads morphology was investigated by scanning electron microscopy...
Using single-crystal Bi2S3 nanowires, we successfully fabricate nanodevices on Si substrate by e-beam lithography. Field-effect as well as novel optoelectronic properties have been obtained from the devices. Under visible or UV light illumination, the conductivity of Bi2S3 nanowire raises several to several orders times within milliseconds due to the generation of electron-hole pairs. Illuminating...
Gecko has elaborate adhesive structure which allows it to move along vertical walls and ceilings quickly. There is strong evidence that the adhesion ability is due to van der Waals forces. Synthetic dry adhesive hairs inspired by gecko foot-hairs have been microfabricated by several groups. To obtain re-attachable dry adhesive hairs with mass production potential, ICP technique is employed to fabricate...
In recent years, high resolution metrology up to nano-scale has attracted substantial attention due to the increasing need of ultra precision measurement systems for MEMS and NEMS calibration. In this paper, an analytical and numerical investigation for the proposed design of a 6-degree-of-freedom (6-dof) universal ultra precision metrology system using relatively simple and inexpensive but highly...
A novel microsensor combining piezoresistive and thermal resistive components is designed and fabricated. A 50mum thick silicon diaphragm (500mumtimes500mum) is used, thicker than that of the conventional piezoresistive pressure sensor, which extends the high stress distribution in the bulk silicon, and increases the operating range as well as the burst pressure. Novel meander shape piezoresistors...
Two step acid-base catalyzed silica xerogels which had integrated structure were prepared through sol-gel and ambient pressure drying. Silica xerogels powder, TiO2 powder and short fibers were added as the additives in order to improve the properties of silica xerogels. The porous structure was estimated by the means of nitrogen adsorption method and mercury intrusion porosimetry (MIP). According...
We present the successful design and fabrication of push-and-pull micro-valve and micro mixer chips that driven by a kind of nanoparticle based giant electrorheological fluid (GER fluid). Our multilayer chips are fabricated by polydimethylsiloxane (PDMS)-based soft lithography techniques. Fast response time of the GER fluid and the push-and-pull valve design adopted assure fast switching time of the...
The physical quantity which is acquired from biological electrical impedance spectroscopy (EIS) can reflect the plentiful biological electrical characteristics. A microfabricated chip and related measurement system, which could be used for electrical impedance spectroscopy analysis, were introduced in this paper. A novel EIS measurement method is emerging. Based on the preliminary experimental results,...
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