Abstract: The tensile elastic modulus, bend elastic modulus and tensile strength of the composite materials hose were determined by uniaxial tension test and three point bending test. The specimen was first destroyed from the inner or outer layer rubber, and then the spiraled cords threads was pulled out and the specimen destroyed with irregular fracture shape. According to the test results, the flexible hose can be considered as linear elastic material because the deformation showed a linear relationship with the external load in uniaxial tension test and three point bending test. The bend elastic modulus EB is much smaller than the tensile elastic modulus ET. The calculation results used EB show a good consistency with the test result and the EB should be selected as design parameters and the design system would be more secure.
Abstract: Research on preparation of nanoporous silica aerogels that using cheap silica sol as silica source, undering atmospheric drying. Using orthogonal test method study the different components how to influence the gel time and the aerogel density and obtaining the best ratio. Also study the different PH value how to influence the gel time, aerogel density and the micro-structure. The results showed that: in Silica Sol, ethanol and water system, the ratio of silica sol and alcohol has significantly affected on gel time and aerogel density, the best volume ratio is 1:3, PH from 2 to 5 aerogel density is about 0.32g/cm3, but the gel time decreases rapidly, PH from 5 to 7 aerogel density increases to 0.4g/cm3 quickly, and gel time changes a little, SEM showed that the micro-structure of aerogel is the best when the PH is 5. The non-critical drying method of cheap preparation comes true.
Abstract: The current paper deals with the fractal effective thermal conductivity model for fibrous porous media containing unsaturated water moisture. The model is based on the thermal-electrical analogy and statistical self-similarity of porous media. The fractal effective thermal conductivity model can be expressed as a function of the pore structure (fractal dimension) and architectural parameters of porous media. It is expected that the model will be helpful in the evaluation of thermal comfort for textiles in the whole range of porosity.
Abstract: Glucose oxidase sensor is one of the best methods for measuring small amounts of glucose; this sensor can be modified using colloidal gold nanoparticles as complementary substance in the electrode structure with the aim of increasing efficiency. In this article, the colloidal gold nanoparticles (24 nm) were used to construct the two electrodes. The first electrode (Au/CP) was constructed of 100 mg carbon graphite powder, 36 µl paraffin oil and 300 µl colloidal gold nanoparticles. The second electrode (Au/CILE) was constructed of 100 mg carbon graphite powder, 36 µl paraffin oil, 300 µl colloidal gold and 50 mg ionic liquid oppf6. To evaluate the performance of each electrode and to prepare of bio sensor, these were covered by solution of 10 mg glucose oxidase and 1 ml phosphate buffer. The bio sensors were test with 0.8 mM glucose solution. By comparing the amount of AMP and the transfer time for both, the according results, the effect of colloidal gold nanoparticles on the increasing conductivity, sensitivity and stability biosensor, was determined.
Abstract: Because nanocrystalline alloy material has some good soft magnetic properties, so it has been already widely uses in many kinds of the sensor. The stress measurement method based on nanocrystalline alloy is one of its lot of the application in the sensor. This kind of stress measuring technique was analyzed theoretically, then a measurement experiment was made in one-way stress and two-way stress using the Fe-base nanocrystalline alloy strip in the laboratory. The results of the test have showed that this stress measurement method is higher measurement sensitiveness and precision.
Abstract: This paper emphasis have researched the effect of Ni/TiO2 group particles modifier with Urea by properties and microstructure，it has showed that ER activity of the particles were closely associated with urea content. When the mass ratio of urea/Ti is 30%, The microstructure observation of the ER fluids under DC electric field showed that the particles aggregated to form thicker and dense column structure when the mass ratio of Urea/Ti is 30%, while the column structure were broken when excessive urea (>30%) was added. A thin and loose column structure was formed in non-urea added ER fluid.
Abstract: The durability of sealing materials for road joint plays an important role in service of roads. The durability of silicone rubber sealant was studied by way of the testing its properties of liquid resistance, chemical resistance, alternate freezing and thawing stability and adhesion at various temperatures. The results evident that silicone rubbers have good thermal characteristics, chemical resistance, and environmental stability, which make this class of materials very attractive selection for use in the outdoor applications.
Abstract: Silica fillers are well known to improve the mechanical properties of elastomers.Nevertheless, the silica filler particles tend to aggregate and affect the properties of the elastomer. In the present study, the silica filler was modified by silane coupling agent (A-151) in order to improve the dispersion of the filler in silicone rubber. The composites samples added with surface treated silica filler was characterized by FT-IR, bound rubber, and fluorescent microscope with that reinforced by the unmodified filler as a comparison. FT-IR results evidences the successful surface modified by silane coupling agent. Bound rubber contents of the origin silica filler are much lower than that of the silica filler with the silane coupling agent treatment. The modified silica-filled shows a better dispersion than that of the origin silica filler and the agglomeration of filler occurs in the unmodified silica-filler compounds.
Abstract: A light emitting material 2-phenylimidazo [4,5-f]-(1,10)-phenanthroline zinc complex has been synthesized. Its structure, energy band, photoluminescent and thermal properties were charaterized by elemental analysis,1H-NMR, Uv-vis absorption, photoluminescent spectra and thermogravimetric technique．The experimental results showed that the complex had a good thermal stability.UV-vis absorption bands of the complex were located at about 207,276,297nm. Its optical gap was 3.08eV. The maximum emitting wavelength was 490nm, which indicates that this complex is an excellent blue-emitting material.