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118 results on '"Xiao, Guyu"'

22. The Functional Fe 3 O 4 @SiO 2 @AuNPs SERS Nanomaterials for Rapid Enrichment and Detection of Mercury Ions in Licorice.

Author

Zhu, Jieqiang, Wang, Baoling, Yang, Ping, Li, Junmei, Xiao, Guyu, Yao, Jiangyu, Gong, Xingchu, Yan, Jizhong, and Zhang, Hui

Subjects
IRON oxides, SERS spectroscopy, MERCURY, CHINESE medicine, METAL ions, HEAVY metals, NANOSTRUCTURED materials
Abstract

There has been an increasing demand for rapid and sensitive techniques for the detection of heavy metal ions that are harmful to the human body in traditional Chinese medicine (TCM). However, the complex chemical composition of TCM makes the quantitative detection of heavy metal ions difficult. In this study, the magnetic Fe3O4@SiO2@AuNPs nanoparticles combined with a probe molecule DMcT were used for the specific enrichment and detection of Hg2+ in the complex system of licorice. The core of Fe3O4 was bonded with SiO2 to increase its stability. A layer of AuNPs was deposited to produce a "core–shell" Raman substrate with high surface-enhanced Raman spectroscopy (SERS) activity, which was surface modified by DMcT probe molecules with sulfhydryl groups. In the presence of Hg2+, Hg2+ binds to N on the amino group of DMcT to form N-Hg2+-N complexes, which induces Fe3O4@SiO2@AuNPs-DMcT clustering to enhance SERS signal. The Raman probe molecule DMcT showed an excellent linear relationship (R2 = 0.9709) between the SERS signal at 1416 cm−1 and the Hg2+ concentration (0.5~100 ng/mL). This method achieved a good recovery (89.10~111.00%) for the practical application of detection of Hg2+ in licorice extracts. The results demonstrated that the functional Fe3O4@SiO2@AuNPs-DMcT performed effective enrichment and showed high sensitivity and accurate detection of heavy metal ions from the analytes. [ABSTRACT FROM AUTHOR]

Published
2022
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49. Superior dispersions of reduced graphene oxide synthesized by using gallic acid as a reductant and stabilizerElectronic supplementary information (ESI) available: Synthesis of graphite oxide and determination of the dispersibility of rGO. See DOI: 10.1039/c2ta00638c

Author

Li, Jing, Xiao, Guyu, Chen, Caibao, Li, Run, and Yan, Deyue

Abstract

Graphene oxide was reduced by natural gallic acid at room temperature and upon heating. Gallic acid functioned as both a reductant and stabilizer during the reaction. The reduction of graphene oxide was verified by UV-vis, IR, Raman spectroscopy and XPS. Moreover, the reduced graphene oxide (rGO) exhibited the best dispersibility ever reported both in water and in organic solvents because of the gallic acid stabilizer. For example, the dispersibility of the rGO synthesized at room temperature is up to 1.2 mg ml−1in water and 4 mg ml−1in dimethylsulfoxide, respectively. This study offers a green approach to the mass preparation of rGO with excellent dispersibility.

Published
2012
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50. Sulfonated Poly(arylene ether sulfone)s with Phosphine Oxide Moieties: A Promising Material for Proton Exchange Membranes

Author

Fu, Lingchao, Xiao, Guyu, and Yan, Deyue

Abstract

Sulfonated poly(arylene ether sulfone)s with phosphine oxide moieties (sPESPO) were achieved by polycondensation of bis(4-hydroxyphenyl)phenylphosphine oxide with 3,3′-disulfonate-4,4′-difluorodiphenyl sulfone (SFDPS) and 4-fluorophenyl sulfone (FPSF). Sulfonated poly(arylene ether sulfone)s (sPES) were also synthesized by polymerization of 4,4′-sulfonyldiphenol with SFDPS and FPSF for comparison. The comparative study demonstrates that the sPESPO ionomers exhibit strong intermolecular interactions and high oxidative stability because of the phosphine oxide groups. Furthermore, the sPESPO membrane and the sPES membrane with an equal ion exchange capacity show much different nanophase separation morphology. As a result, the former shows better properties than the latter. The sPESPO membranes exhibit excellent overall properties. For instance, the sPESPO membrane, with a disulfonation degree of 45%, exhibits high thermal and oxidative stability. Moreover, it shows a water uptake of 30.8% and a swelling ratio of 15.8% as well as a proton conductivity of 0.087 S/cm at 80 °C.

Published
2010
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