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A simple volatile organic compound (VOC) sensor based on a tapered small core singlemode fiber (SCSMF) structure is reported. The tapered SCSMF fiber structure with a waist diameter of 7.0 μm is fabricated using a customized microheater brushing technique. Silica based material containing immobilized Nile red was prepared by a sol-gel method and was used as a coating applied to the surface of the...
The spherical beads were first systhesized by cellulose 4-methylbenzoate with partial hydroxyl groups, which was then crosslinked in the beads with 4, 4'-diphenylmethane dissocyanate. The obtained crosslinked beads were packed into an HPLC column and used as chiral stationary phase (CSP) for chiral separation of some racemates by high performance liquid chromatography (HPLC) using mobile phases contained...
Transesterification of canola oil with methanol was investigated under a heterogeneous catalysts system. Various γ-Al2O3-, hydrotalcite-, SiO2-supported Na, Ca oxides prepared via an impregnation method were applied as solid catalyst. The influence of supports (γ-Al2O3, hydrotalcite, SiO2) structure on the activity and adsorption behavior of Na, Ca-based catalysts for transesterification was comparatively...
Supercritical CO2 extraction was employed to separate simulated and real bio-oil. Effects of adsorbents on enrichment were investigated for a simulated bio-oil, which is composed of acetic acid (AC), propanoic acid (PA), furfural (FR), acetylacetone (AA) and 2-methoxyphenol (MP). Extraction of spiked bio-oil shows adsorbents are able to influence extraction efficiency and selectivity. Appropriate...
Soybean saponin has a lot of physiological activities and pharmacological action and has been extensively used in health food and medicine. In this paper, an adsorption chromatographic method with a resin column was developed to obtain crude soybean saponins. After that, a silica column was used to separate crude soybean saponins and prepare group B soybean saponins which consist of soybean saponin...
We demonstrate spectral broadening in tapered optical fibres embedded in silica aerogel. The aerogel provides protection to the taper without noticeably affecting the refractive and dispersive properties or power handling.
Hydrated nanopores offer a unique environment for studying biological molecules under controlled conditions and fabricating sensors using fluorescence. Silica nanopores for example are non-toxic, biologically and optically compatible with protein, and can be easily synthesized to entrap protein and exclude potentially interfering macromolecules, while transmitting analytes of interest. A well known...
We use controlled hole collapse in photonic crystal fibres to reduce the splice loss between dissimilar fibres. We also describe a hollow-core PCF as a support for a waveguide core made from silica aerogel.
Hydrogenated silicon nitride (SiNx:H) is used as an anti-reflection coating and passivating medium in crystalline silicon photovoltaic technology. In these studies, we deposited SiNx:H on a variety of silicon wafers by both the PBS?? remote plasma enhanced chemical vapor deposition process and the direct plasma enhanced chemical vapor deposition process. After deposition, the minority-carrier lifetime...
We filled the core of hollow-core photonic crystal fibre with silica aerogel. The filled fibre exhibits a shifted bandgap and a region of broadband guidance in good agreement with simulation.
We present a MEMS nanoreactor that for the first time enables transmission electron microscopy (TEM) of nanomaterials at the atomic scale during exposure to reactive gases at ambient pressure. This pressure exceeds that of existing in-situ TEM systems by a factor of one hundred. The reactor integrates a shallow flow channel (35 mum high) with a microheater and an array of robust electron-transparent...
In this paper we present a study on the integration of the hydraulic circuit of the thermal cooling system of a portable power electronic device (like laptops) with the one which reforms a direct methanol fuel cell DMFC that is supplying power to this portable electronic system. This integration is done via a porous electroosmotic (EO) pump. The theory of the EO pumping, the analytical study and a...
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