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295 results on '"Guo, Meiling"'

10. High strength, anti-freezing, and conductive poly(vinyl alcohol)/urea ionic hydrogels as soft sensor

Author

Ye, Wenhao, Guo, Meiling, Li, Qing, Wang, Li, Zhao, Chuanxia, Xiang, Dong, Lai, Jingjuan, Li, Hui, Li, Zhenyu, and Wu, Yuanpeng

Subjects
Urea -- Usage, Polyvinyl alcohol -- Usage, Chemical detectors -- Materials, Engineering and manufacturing industries, Science and technology
Abstract

Hydrogel-based sensors with excellent flexibility and stretchability have received extensive attention. However, fabricating anti-freezing, high-strength, and conductive hydrogel-based sensors remains a significant challenge. A stretchable sensor with high strength and anti-freezing herein is constructed using poly(vinyl alcohol)/urea (PVA/urea) ionic hydrogels. The PVA/urea ionic hydrogels were prepared by a simple strategy of soaking the freeze-thawed PVA hydrogels in sodium citrate ([Na.sub.3]Cit) water/urea aqueous solutions. The presence of [Na.sub.3]Cit in the hydrogel produces hydrophobic aggregation, endowing the PVA/urea ionic hydrogel with high mechanical properties (-1.51 MPa) and makes the hydrogel have high strain gauge factors (GF = 1.94). The synergistic effect of [Na.sub.3]Cit and urea endows the PVA/urea ionic hydrogel with anti-freezing properties (~-20[degrees]C). The obtained sensors have excellent stability (100 cycles at [epsilon] = 85%) and could detect various human activities even at -20[degrees]C. More importantly, joint motion can be monitored wirelessly via Bluetooth at -20[degrees]C. This work provides a feasible method to construct anti-freezing, high-strength, and conductive hydrogel. It paves the way for versatile applications in human-motion detection, intelligence device, and biomimetic skin. KEYWORDS anti-freezing, poly (vinyl alcohol), sensors, sodium citrate, urea, 1 | INTRODUCTION Hydrogels with a three-dimensional network structure can maintain a specific shape in water without dissolving. [1-4] They can act as appropriate carriers or frameworks for functional soft [...]

Published
2022
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25. Nondissociative Activated Dihydrogen Binding on CeO2Revealed by High-Pressure Operando Solid-State NMR Spectroscopy

Author

Yao, Xinlong, Ji, Yi, Huang, Zheng-Qing, Zhao, Zhenchao, Gao, Pan, Guo, Meiling, Liu, Xuebin, Meng, Caixia, Fu, Qiang, Chang, Chun-Ran, Bao, Xinhe, and Hou, Guangjin

Abstract

Dihydrogen complexes, which retain the H–H bond, have been extensively studied in molecular science and found to be prevalent in homogeneous and enzymatic catalysis. However, their counterparts in heterogeneous catalysis, specifically nondissociative chemisorbed dihydrogen binding on the catalyst surface, are rarely reported experimentally. This scarcity is due to the complexity of typical material surfaces and the lack of effective characterization techniques to prove and distinguish various dihydrogen binding modes. Herein, using high-pressure operando solid-state NMR technology, we report the first unambiguous experimental observation of activated dihydrogen binding on a reduced ceria catalyst through interactions with surface oxygen vacancies. By employing versatile NMR structural and dynamical analysis methods, we establish a proportional relationship between the degree of ceria surface reduction and dihydrogen binding, as evidenced by NMR observations of H-D through-bond coupling (JHD), T1relaxation, and proton isotropic chemical shifts. In situNMR analysis further reveals the participation of bound dihydrogen species in a room-temperature ethylene hydrogenation reaction. The remarkable similarities between surface-activated dihydrogen in heterogeneous catalysis and dihydrogen model molecular complexes can provide valuable insights into the hydrogenation mechanism for many other solid catalysts, potentially enhancing hydrogen utilization.

Published
2024
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36. The Sihailongwan Maar Lake, northeastern China as a candidate Global boundary Stratotype Section and Point for the Anthropocene series

Author

Han, Yongming, primary, Zhisheng, An, additional, Lei, Dewen, additional, Zhou, Weijian, additional, Zhang, Luyuan, additional, Zhao, Xue, additional, Yan, Dongna, additional, Arimoto, Richard, additional, Rose, Neil L, additional, Roberts, Sarah L, additional, Li, Li, additional, Tang, Yalan, additional, Liu, Xingqi, additional, Fu, Xuewu, additional, Schneider, Tobias, additional, Hou, Xiaolin, additional, Lan, Jianghu, additional, Tan, Liangcheng, additional, Liu, Xingxing, additional, Hu, Jing, additional, Cao, Yunning, additional, Liu, Weiguo, additional, Wu, Feng, additional, Wang, Tianli, additional, Qiang, Xiaoke, additional, Chen, Ning, additional, Cheng, Peng, additional, Hao, Yifei, additional, Wang, Qiyuan, additional, Chu, Guoqiang, additional, Guo, Meiling, additional, Han, Mei, additional, Tan, Zhihai, additional, Wei, Chong, additional, and Dusek, Ulrike, additional

Published
2023
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44. sj-docx-1-anr-10.1177_20530196231167019 – Supplemental material for The Sihailongwan Maar Lake, northeastern China as a candidate Global Boundary Stratotype Section and Point for the Anthropocene Series

Author

Han, Yongming, Zhisheng, An, Lei, Dewen, Zhou, Weijian, Zhang, Luyuan, Zhao, Xue, Yan, Dongna, Arimoto, Richard, Rose, Neil L, Roberts, Sarah L, Li, Li, Tang, Yalan, Liu, Xingqi, Fu, Xuewu, Schneider, Tobias, Hou, Xiaolin, Lan, Jianghu, Tan, Liangcheng, Liu, Xingxing, Hu, Jing, Cao, Yunning, Liu, Weiguo, Wu, Feng, Wang, Tianli, Qiang, Xiaoke, Chen, Ning, Cheng, Peng, Hao, Yifei, Wang, Qiyuan, Chu, Guoqiang, Guo, Meiling, Han, Mei, Tan, Zhihai, Wei, Chong, and Dusek, Ulrike

Subjects
Geography
Abstract

Supplemental material, sj-docx-1-anr-10.1177_20530196231167019 for The Sihailongwan Maar Lake, northeastern China as a candidate Global Boundary Stratotype Section and Point for the Anthropocene Series by Yongming Han, An Zhisheng, Dewen Lei, Weijian Zhou, Luyuan Zhang, Xue Zhao, Dongna Yan, Richard Arimoto, Neil L Rose, Sarah L Roberts, Li Li, Yalan Tang, Xingqi Liu, Xuewu Fu, Tobias Schneider, Xiaolin Hou, Jianghu Lan, Liangcheng Tan, Xingxing Liu, Jing Hu, Yunning Cao, Weiguo Liu, Feng Wu, Tianli Wang, Xiaoke Qiang, Ning Chen, Peng Cheng, Yifei Hao, Qiyuan Wang, Guoqiang Chu, Meiling Guo, Mei Han, Zhihai Tan, Chong Wei and Ulrike Dusek in The Anthropocene Review

Published
2023
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46. Bottom-up synthesis of a pyramid-type (Pt/4nmCeO2)/SiO2 catalyst via a surface reduction strategy.

Author

Han, Jianyu, Zhang, Zhixin, Xu, Zhuoran, He, Lunhua, Shen, Feiran, Wang, Yehong, Liu, Xuebin, Guo, Meiling, Guan, Zaihong, and Wang, Feng

Abstract

The interfaces in heterogeneous catalysts play an important role in their performances by either directly providing active sites through the synergistic effects from different catalyst compositions or indirectly modulating the state of active sites. However, constructing abundant interfaces in heterogeneous catalysts is a key scientific challenge since it requires the high dispersion of all catalyst compositions involved in substrate activation. A surface reduction strategy is proposed as the solution for this challenge, which creates a pyramid-type catalyst, (Pt/4nmCeO2)/SiO2, with maximized interfacial Pt–CeO2 sites as an example. Pt is chemically bound in surface reductive centers of 4 nm CeO2 nano-islands, generating stable Pt2+ sites with moderate hydrogenation capacity compared to Pt0 sites on bulk CeO2 and SiO2. This work facilitates the development of heterogeneous catalysts by presenting a high level of controlling the local chemical environment within nanomaterials. [ABSTRACT FROM AUTHOR]

Published
2023
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