Publications (5)19.74 Total impact
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Article: Droplet microfluidic preparation of au nanoparticles-coated chitosan microbeads for flow-through surface-enhanced Raman scattering detection
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ABSTRACT: An integrated microfluidic device was fabricated to enable on-chip droplet forming, trapping, fusing, shrinking, reaction and producing functional microbeads for a flow-through single bead-based molecule detection. Dielectrophoresis (DEP) force was used to transport target polymer droplets into different predefined microwells, where the droplets were fused through electrocoalescence to form a new one with a desired diameter. In a continuous water loss process with water diffusion to oil phase, the polymer droplet was shrunken and solidified to form a polymer microbead. For a demonstration, Au nanoparticles-coated chitosan microbeads were in situ fabricated through droplet trapping, fusion and shrinking, followed by synthesis of Au nanoparticles on the microbead surface via a photoreduction process. The produced Au nanoparticle/chitosan microbead embedded in the microwell resulted in a highly sensitive, flow-through surface-enhanced Raman scattering (SERS) detection of Rhodamine 6G (R6G). This work successfully demonstrates an integrated droplet based lab-on-a chip and its application to fabricate an extremely high-throughput single bead based detection platform. KeywordsMicrofluidics-Microdroplet-Microbead-Nanoparticle synthesis-SERS-Lab-on-a-chipMicrofluidics and Nanofluidics 04/2012; 9(6):1175-1183. · 3.37 Impact Factor -
Article: Covalently linked DNA/protein multilayered film for controlled DNA release.
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ABSTRACT: A stable, biocompatible single strand DNA (ssDNA)/bovine serum albumin (BSA) multilayered film for control release of DNA was fabricated on PEI-coated quartz slides, gold-evaporated plates and silicon wafers, respectively through a formaldehyde-induced, covalently linked layer-by-layer (LBL) assembly technique. The constructed film structure was well characterized by using UV-vis spectrometry, surface plasmon resonance (SPR) and atomic force microscopy (AFM). The results showed that the DNA incorporated LBL film was fabricated successfully and the amount of ssDNA and BSA in the film could be tailored simply by controlling the number of the bilayers. The control release of DNA from the film was also monitored in this study. UV-vis spectrometry, SPR and AFM measurements indicated that the release of ssDNA and amino acid was adjustable by changing the proteinase K incubation time. This biocompatible covalently assembled film demonstrates an innovative approach to engineer a DNA/protein based nanostructure for controlled DNA release, which could provide stability, controllability and flexibility superior to that of LBL film assembled by electrostatic attraction. Since the film in this work can be assembled on different substrates, it is very feasible to fabricate nanoparticle-based gene therapy systems with this new approach and to have great potential in biomedical applications.Journal of Colloid and Interface Science 11/2007; 314(1):80-8. · 3.07 Impact Factor -
Article: Synthesis and electrical transport of novel channel-structured beta-AgVO3.
Small 08/2007; 3(7):1174-7. · 8.35 Impact Factor -
Article: Novel porous anatase TiO2 nanorods and their high lithium electroactivity
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ABSTRACT: We demonstrated a simple approach for the synthesis of a kind of novel porous anatase TiO2 nanorods. The method is based on a reaction in composite-hydroxide eutectic system and normal atmosphere without using an organic dispersant or capping agent. The synthesis technique is cost effective, easy to control and is adaptable to mass production. This is the first time TiO2 nanorods with a porous structure are fabricated by using this method. The as-prepared material was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), nitrogen adsorption and desorption experiments and electrochemical measurements. The results showed that the anatase TiO2 nanorods obtained in our experiment have a large specific surface area with a porous structure which makes it have a potential application in catalysts and battery materials, especially in lithium ion batteries. In this study, we mainly tested their electrochemical performance as negative materials for lithium ion batteries. Further research to optimize synthesis conditions, particularly to develop their application in the field of catalysis is currently in progress.Electrochemistry Communications. -
Article: Carbon nanotube/polyaniline composite as anode material for microbial fuel cells
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ABSTRACT: A carbon nanotube (CNT)/polyaniline (PANI) composite is evaluated as an anode material for high-power microbial fuel cells (MFCs). Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) are employed to characterize the chemical composition and morphology of plain PANI and the CNT/PANI composite. The electrocatalytic behaviour of the composite anode is investigated by means of electrochemical impedance spectroscopy (EIS) and discharge experiments. The current generation profile and constant current discharge curves of anodes made from plain PANI, 1 wt.% and 20 wt.% CNT in CNT–PANI composites reveal that the performance of the composite anodes is superior. The 20 wt.% CNT composite anode has the highest electrochemical activity and its maximum power density is 42 mW m−2 with Escherichia coli as the microbial catalyst. In comparison with the reported performance of different anodes used in E. coli-based MFCs, the CNT/PANI composite anode is excellent and is promising for MFC applications.Journal of Power Sources 170(1):79-84. · 4.95 Impact Factor
