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619 results on '"Jiang, Yonggang"'

155. Flexible smart sensing skin for “Fly-by-Feel” morphing aircraft

Author

Huang, YongAn, primary, Zhu, Chen, additional, Xiong, WenNan, additional, Wang, Yu, additional, Jiang, YongGang, additional, Qiu, Lei, additional, Guo, DongLiang, additional, Hou, Chao, additional, Jiang, Shan, additional, Yang, ZhaoXi, additional, Wang, Bo, additional, Wang, Lu, additional, and Yin, ZhouPing, additional

Published
2021
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169. Enhanced Oxygen Vacancies in Ce-Doped SnO 2 Nanofibers for Highly Efficient Soot Catalytic Combustion.

Author

Zhu, Silun, Shi, Shuying, Zheng, Xinhua, Wang, Xinqiang, Yu, Gang, Jiang, Yonggang, Feng, Jian, Zhu, Luyi, and Zhang, Guanghui

Subjects
SOOT, FIBERS, NANOFIBERS, CATALYTIC activity, COMBUSTION, CRYSTAL lattices, SOL-gel processes, CATALYTIC oxidation
Abstract

In this paper, cerium was incorporated into polyhydroxyltriacetictin (PHTES) using the sol-gel method combined with electrospinning technology to prepare a series of composite oxide fiber catalysts SnxCe1−xO2 in different proportions. The structures and soot catalytic activities of SnxCe1−xO2 fibers were studied under loose contact conditions. When Ce entered the crystal lattice of SnO2, the structural symmetry of the SnO2 was destroyed, which inhibited the crystallization and grain growth of the fiber, and fiber catalysts with a larger specific surface area were obtained. Moreover, the introduction of Ce improved the number of oxygen vacancies and redox ability of the catalyst, thus promoting the catalytic activity of the catalyst for soot particles. In particular, among them, the Sn0.7Ce0.3O2 fiber catalysts had the strongest catalytic oxidation ability regarding soot particles and could oxidize soot particles at a lower temperature and faster catalytic rate. The results of the temperature-programmed oxidation of Sn0.7Ce0.3O2 fiber catalyst, conducted three times under the same conditions, were basically consistent, indicating that the experimental results are reliable and repeatable. In addition, the Sn0.7Ce0.3O2 fiber catalyst showed good cycle stability. [ABSTRACT FROM AUTHOR]

Published
2022
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171. Metal-Free Synthesis of Phenol-Aryl Selenides via Dehydrogenative C-Se Coupling of Aryl Selenoxides with Phenols

Author

Zhengfen Liu, Linlin Zhang, Chunxiang Liu, Xiao-Dong Yang, Hongbin Zhang, Jiang Yonggang, Jing Wang, Minyan Li, and Tiantian Li

Subjects
Reaction mechanism, 010405 organic chemistry, Aryl, Organic Chemistry, 010402 general chemistry, 01 natural sciences, Medicinal chemistry, 0104 chemical sciences, Coupling (electronics), chemistry.chemical_compound, Metal free, chemistry, Functional group, Phenol, Phenols
Abstract

Herein, we disclose the synthesis of diaryl selenides through an unexpected C-Se coupling between aryl benzyl selenoxides and phenols. The synthetic significance of the method is that it provides a mild, rapid, and metal-free access to organoselenides in high yields with excellent functional group tolerance. This coupling of aryl benzyl selenoxides reveals a completely new reaction possibility compared with aryl sulfoxides. We also probed the reaction mechanism of this unexpected transformation through experimental studies and revealed a special Se(IV)-Se(III)-Se(II) reaction pathway.

Published
2020

172. Enhanced flow sensing with interfacial microstructures

Author

Zhiqiang Ma, Deyuan Zhang, Gongchao Liu, Peng Zhao, Jiang Yonggang, and Dawei Shen

Subjects
biological flow receptors, Materials science, lcsh:Biotechnology, 0206 medical engineering, Biomedical Engineering, Biophysics, Nanotechnology, 02 engineering and technology, Flow measurement, biomechanics, Biomaterials, lcsh:Biochemistry, Functional importance, interfacial microstructures, biomechanical principles, lcsh:TP248.13-248.65, lcsh:QD415-436, Mechanical Engineering, enhanced flow sensing, biological techniques, 021001 nanoscience & nanotechnology, flow measurement, 020601 biomedical engineering, Surfaces, Coatings and Films, Flow (mathematics), bioinspired flow sensors, 0210 nano-technology, flow sensors
Abstract

Biological flow receptors show astonishing performance and are used as models for the design of novel flow sensors. However, the functional importance of interfacial microstructures is seldom discussed in previous review papers. Herein, this review summarises the underlying biomechanical principles in the biological flow receptors and describes the recent progress in bio-inspired flow sensors, in which the underlying sensing-enhancement mechanisms are emphasised.

Published
2020

179. Foreign element doping and thermal stability of alumina aerogels.

Author

Peng, Fei, Jiang, Yonggang, Feng, Jian, Feng, Junzong, and Li, Liangjun

Subjects
*THERMAL stability, *AEROGELS, *ALUMINUM oxide, *THERMAL insulation, *THERMAL conductivity, *HIGH temperatures
Abstract

The addition of foreign elements is considered as an effective method to improve the thermal stability of alumina aerogels at a higher temperature. However, the location and stabilizing mechanism of the foreign elements in the alumina aerogel have not been carefully studied. In this work, Si or La was introduced into the network of alumina aerogels through a sol‐gel strategy. The Si‐doped alumina aerogel maintained high surface area (92 m2/g) and pore volume (0.572 cm3/g) even at 1300°C. The dopants prevented α‐Al2O3 transformation at elevated temperatures (1200°C–1300°C). The distribution of foreign ions and their stabilizing mechanism were discussed in detail. The doped alumina aerogels reinforced by mullite fiber felt, with quite low density and thermal conductivity, can be used as high‐temperature thermal insulations. [ABSTRACT FROM AUTHOR]

Published
2022
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195. Accessible mesoporous carbon aerogel preparation and its application as ultra-low pt support for oxygen reduction reaction with high catalytic activity.

Author

Luo, Yi, Feng, Junzong, Jiang, Yonggang, Li, Liangjun, and Feng, Jian

Abstract

Carbon supported Pt and its alloys (Pt/C) are the most practical catalysts for oxygen reduction reaction (ORR). To further reduce scare Pt content in the Pt/C is of great importance for its widely application. Carbon substrate plays a critical role in decreasing Pt proportion. In this research, accessible pores carbon aerogel is prepared to be support for Pt nanoparticles by sol–gel method. A mild reduction agent H2 is choose to produce ultra-small Pt nanoparticles with only 1.5 nm diameter. The carbon aerogel could lower Pt to be ultra-low content of 4.2% mass percentage. Ultra-small Pt nanoparticles are uniformly dispersed on the carbon aerogel, which is significant for improving Pt utilization and catalytic performance. The Pt/carbon aerogel, is of high ORR catalytic activity with electrochemical surface area 188 m2 g−1Pt, mass activity 107 mA mg−1Pt and low Tafel slope 47.87 mV dec−1, which could be ascribed to carbon aerogel support with high mesoporous surface area of 500 m2/g. Pt/carbon aerogel were comprehensively studied by N2 adsorption/desorption, SEM, TEM, XPS and XRD to reveal relations between properties and structures. Based on the research results, the Pt/carbon aerogel is a kind of promising low Pt catalyst for ORR. [ABSTRACT FROM AUTHOR]

Published
2021
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196. On-chip rotational manipulation of microbeads and oocytes using acoustic microstreaming generated by oscillating asymmetrical microstructures

Author

Feng, Lin, primary, Song, Bin, additional, Chen, Yuanyuan, additional, Liang, Shuzhang, additional, Dai, Yuguo, additional, Zhou, Qiang, additional, Chen, Dixiao, additional, Bai, Xue, additional, Feng, Yanmin, additional, Jiang, Yonggang, additional, Zhang, Deyuan, additional, and Arai, Fumihito, additional

Published
2019
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