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26 results on '"Luo, Xiao-gang"'

23. A novel chemical detector using colorimetric sensor array and pattern recognition methods for the concentration analysis of NH3.

Author

Luo, Xiao-gang, Liu, Ping, Hou, Chang-jun, Huo, Dan-qun, Dong, Jia-le, Fa, Huan-bao, and Yang, Mei

Subjects
*CHEMICAL detectors, *COLORIMETRIC analysis, *PATTERN perception, *DYES & dyeing, *AMMONIA, *RADIAL basis functions, *ARTIFICIAL neural networks
Abstract

With a colorimetric sensor array comprising chemoresponsive dyes, a simple, rapid, and cost-effective integrated system for differentiating low-concentration gases was described. The system could be used to identify gases by detecting the color change information of the chemoresponsive dyes based on porphyrins before and after reaction with the target gas; the colorimetric sensor array images were collected by a charge coupled device and processed with image analysis to get the color changes of the dyes in the array. Temperature, humidity, and flux of the chamber could be detected and displayed on the personal computer screen. A low-concentration [30-210 ppb (parts per 109)] NH3 was detected by the system. This prototype successfully differentiated four concentration levels of NH3 in less than 1 min. Pattern recognition methods, such as the backpropagation neural network and the radial basis function neural network, validated the effect of the developed sensor system both with 100% classification with feature vectors at single time point as inputs. [ABSTRACT FROM AUTHOR]

Published
2010
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24. A novel chemical detector using colorimetric sensor array and pattern recognition methods for the concentration analysis of NH3.

Author

Luo, Xiao-gang, Liu, Ping, Hou, Chang-jun, Huo, Dan-qun, Dong, Jia-le, Fa, Huan-bao, and Yang, Mei

Subjects
CHEMICAL detectors, COLORIMETRIC analysis, PATTERN perception, DYES & dyeing, AMMONIA, RADIAL basis functions, ARTIFICIAL neural networks
Abstract

With a colorimetric sensor array comprising chemoresponsive dyes, a simple, rapid, and cost-effective integrated system for differentiating low-concentration gases was described. The system could be used to identify gases by detecting the color change information of the chemoresponsive dyes based on porphyrins before and after reaction with the target gas; the colorimetric sensor array images were collected by a charge coupled device and processed with image analysis to get the color changes of the dyes in the array. Temperature, humidity, and flux of the chamber could be detected and displayed on the personal computer screen. A low-concentration [30-210 ppb (parts per 109)] NH3 was detected by the system. This prototype successfully differentiated four concentration levels of NH3 in less than 1 min. Pattern recognition methods, such as the backpropagation neural network and the radial basis function neural network, validated the effect of the developed sensor system both with 100% classification with feature vectors at single time point as inputs. [ABSTRACT FROM AUTHOR]

Published
2010
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25. The Rapid Fabrication of Hydrogel Microfluidic Chip for Cell Capture Culture and Metabolites Detection

Author

Fang, Ke Jing, Hou, Chang Jun, Huang, Cheng Hong, Luo, Xiao Gang, Zhang, Su Yi, Shen, Cai Hong, and Huo, Dan Qun

Abstract

The microfluidic chip with well-defined structure is an important platform for cell research. The existing techniques for chip fabrication especially in cell biology and tissue engineering have many defects, for example, poor processing precision, high processing cost, as well as sophisticated manufacturing procedure. Thus, fabrication of simple and practicable microfluidic chip with highly efficient cell control ability and low-cost is turned to be the main target for bioengineering application. Poly(ethylene glycol) (PEG) is a hydrophilic polymer. Substituting terminal hydroxyl groups with acrylates, forming poly(ethylene glycol) diacrylate (PEGDA), allows the polymer to be cross-linked to form a three-dimensional polymer network. Meanwhile the use of photopolymerization can realize precise and temporal control of polymerization for formation of complex shapes. Herein, we utilize PEGDA hydrogel’s highly tunable characteristic, using photopolymerization method to obtain desirable micro-structure. Each chip has four of uniform micro-structures, which can carry multiple parallel experiments at the same time. We also add 2-Hydroxyethyl Methacrylate (HEMA) to the PEGDA prepolymer in order to increase the cell adhesion capacity of the microchip surface for cell culture. The experimental results showed that this method can achieve double-layer cell culture with short time treatment. Cells can be well captured and cultured in the hydrogel microfluidic chip with excellent activity. The hydrogel microfluidic chip has the potential of practicable application once large-scale preparation is accomplished.

Published
2013
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26. Coordination Reaction between Series Hydroxyl-Porphyrins and Pb2+ Studied by Spectroscopic Method

Author

Fa, Huan Bao, Chen, Sheng Fang, Zhang, Ming, Huo, Dan Qun, Yin, Wei, Luo, Xiao Gang, Lu, Zhong Ming, and Hou, Chang Jun

Abstract

Reaction conditions and spectroscopy properties of series hydroxyl-porphyrins for bonding with Pb2+ were described. A stable complex was formed with molar ratio 1:1 in the solution of N,N-dimethylformamide (DMF) with 0.6ml tween-80 as surfactant, when the pH was controlled at 6.5. The hydroxyl group on the benzene ring resulted in Soret band red shift of Pb-porphyrin complexes from 415.8 to 422.7nm, and isosbestic point of the axial coordination reaction appeared at 419.5nm. The study of thermodynamics predicted that the monohydroxyl-porphyrin had the optimal identification effects for Pb2+.

Published
2011
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