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Through studying the micropump and microvalve used in microfluidic control chemical analysis from the design of structure, working principle and fabrication process, a novel PZT-driven micropump was developed. The construction and the fabrication process are quite simple. It consists of flexible PDMS pump diaphragm, base plate and piezo-bimorph actuator. Diaphragm, meanwhile, is an active valve whose...
In this study, basing on electrochemistry and MEMS technology we develop a novel biosensor with multi channels to detect three markers (hyaluronic acid (HA), Laminin (LN), type IV collagen (IV-C) ) so as to evaluate the liver disease. With MEMS technology, a chip including a CE, a RE and 6 gold electrodes is fabricated for detection of at most 6 markers simultaneously. Different antibodies of serum...
Various sensing characteristic of carbon nanotube synthesized by low press chemical vapor deposit (LPCVD) method have been studied. The composite sensing film of silicon dioxide and multi-wall nanotubes (SiO 2-MWNTs) is sensitive to methane. The various characteristic such as sensitivity, repeatability, reliability and cross-sensitivity of SiO2-MWNTs composite film gas sensor have been studied. Having...
We have demonstrated multi-walled carbon nanotube (MWCNTs) based sensors, which are capable of detecting alcohol vapor with ultra-low power. We fabricated the Si-substrate sensors using an AC electrophoretic technique so as to form bundled MWCNTs sensing elements between Au microelectrodes. The I-V measurement illustrates that we can activate the sensors at the Ohmic region of the sensors (at 10 muA),...
This paper presents an experimental investigation of a micro dripping mode of electrostatic droplet ejection for the liquid solvents, such as DI water, acetone, dioxane, dioxane+ DI water (10% ,25% ,50% ,66.7%), of different physical properties. Emphasis is given to how the electrical conductivities of liquid solvents affect the stability of a micro dripping mode of drop-on-demand droplet ejection...
In this paper, we have investigated the characteristics of a thermopneumatic-actuated polydimethylsiloxane (PDMS) microfluidic system integrated with a micropump and microvalves on the same structure. A thermopneumatic-actuated PDMS microfluidic system has been fabricated and its properties are characterized. The advantages of proposed microfluidic system are disposable, low cost fabrication process...
(FePt)1-xCux alloy nanoparticles were prepared by chemical-reduction of platinum acetylacetonate, iron acetylacetonate and copper acetylacetonate with 1,2-hexadecanediol as the reducing regent. As prepared, the particles have a disordered fcc structure with an average diameter of ca. 3nm. The addition of 4 % copper promotes the effect that the disordered fcc structure transforms to ordered fct phase,...
A new ionomer of sulfonated ethylene vinyl alcohol copolymer, EVOH-g-SO3H was synthesized and the ionic polymer metal composite (IPMC) based on EVOH-g-SO3H polymer has been produced through electroless deposition of platinum on the bare polymer membranes. The actuation performance for IPMC actuator was tested in order to set up a relationship between the structure and the behavior. The morphology...
The study on small molecular space morphology of nanometer material by a high-resolution Atomic Force Microscopy (AFM) is introduced in this paper. The high-resolution AFM.IPC-208B was developed by Chongqing University, and its precision: lateral resolution is 0.1 nm, vertical resolution is 0.01 nm. Applying AFM.IPC-208B, we obtained the surface structures of five samples (natural white mica, polyimide,...
Significant research and development efforts have been devoted to producing reliable glucose sensors for in vitro or in vivo applications, because of high demand for blood glucose monitoring and other application. The outstanding electrochemical properties of carbon nanotubes, along with their high surface area, can promote electron-transfer and enlarge enzyme loading, which provide the available...
The new gel-immobilization method for preparing a single stranded DNA (ssDNA) template has been described for single nucleotide polymorphisms (SNPs) genotyping by bioluminometric assay based on allele-specfic extension reaction. In this method, PCR products amplified by a primer modified with acrylamide group at the 5'-terminal is copolymerized with acrylamide monomer to form gel. After the ssDNA...
A micro-pillar chip is proposed and developed to separate the amino acids, phenylalanine and tryptophan, through the aqueous two-phase system (ATPS). The surface properties of micro-pillars, specifically hydrophobicity and hydrophilicity for separation are also investigated. Because their isoelectric points (pI values) are similar, these amino acids are difficult to separate by general extraction...
A novel method for constructing an automated cell fractionation system was developed by integrating traveling-wave dielectrophoresis (twDEP) and laminar flow on a single biochip-based device. Novel electrodes designs on indium tin oxide (ITO) glass and pre-molded poly(dimethylsiloxane) (PDMS) microfluidic chamber, as well as an automated cell tracking method based on a computer-assisted image analysis...
Bio-fuel cell (BFC) using baker's yeast was constructed to examine electricity production. Glucose was used as fuel and electricity was produced by the overall redox reaction in the cell. Neoseptareg membrane was used as proton exchange membrane for separating an anodic compartment and a cathodic compartment. As electron mediator, methylene blue was used for transporting electron from yeast to electrode...
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