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257 results on '"Nie, Yijing"'

12. Hierarchical two‐dimensional Ti‐MOF derived from MXene for hybrid supercapacitor electrodes.

Author

Li, Sumin, Cheng, Qiang, Ye, Pingwei, Zhang, Yang, Zhang, Limin, Liu, Feng, Qiu, Han, Qu, Xiaokun, and Nie, Yijing

Subjects
ENERGY density, POWER density, DISCONTINUOUS precipitation, ACTIVATED carbon, METAL-organic frameworks, SUPERCAPACITOR electrodes, SUPERCAPACITORS
Abstract

Presently, two‐dimensional (2D) metal–organic framework (MOF) are drawing increasing attention in energy‐storage areas. However, more and complexed factors would affect the nucleation and growth of 2D MOFs, and subsequently affect the final performance. Particularly, it is important to control the coordination rate between ions and ligands. In this paper, MXene was directly used as titanium source to coordinate with an organic ligand to form Ti‐MOF sheets. To further boost the performance, mesopores were introduced in preparing 2D Ti‐MOF, constructing hierarchical porous Ti‐MOF@Ti3C2TX hybrids. Results showed that diffusion‐controlled behaviors play a dominant role over surface capacitive behaviors during the charge storage process of the hierarchical porous hybrids. A hybrid supercapacitor (HSC) assembled with the obtained HP‐Ti‐MOF@Ti3C2TX and activated carbon (AC) exhibited an energy density of 22.9 Wh kg−1 at a power density of 850 W kg−1 (1 A g−1), and a power density of 4.25 kW kg−1 at an energy density of 15.3 Wh kg−1 (5 A g−1). The present strategy is expected to provide design ideas for novel energy‐storage electrode materials. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Combing experimental methods and molecular simulations to study self-healing behaviors of polyurethane elastomers containing multiple hydrogen bond networks and flexible blocks.

Author

Wen, Jianlong, Xu, Guangwei, Liang, Zhaopeng, Li, Sumin, Wang, Yinmao, Yang, Juan, and Nie, Yijing

Abstract

The preparation of polymers with high self-healing ability is conducive to environmental protection and resource conservation. In the present work, two kinds of polyurethane (PU) elastomers were prepared: the one containing flexible end blocks (polypropylene glycol) and the other containing flexible end blocks and 2-ureido-4[1H]-pyrimidinone (UPy) groups that can form reversible quadruple hydrogen bonds. Both of the two PU elastomers have self-healing ability. At low temperatures the PU without UPy groups exhibits stronger self-healing ability, while at high temperatures the PU with UPy groups has better self-healing function. The difference can be attributed to the combined effect of segmental mobility and reversible network strength. Based on molecular simulations, we further observed that the self-healing behaviors are affected by four factors: healing temperature, reversible interaction strength, reversible interaction site density and segment diffusion ability. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Local segmental miscibility dominating stereocomplex crystallization in polymer blends.

Author

Zhu, Qian, Wen, Jianlong, Ma, Mingyang, and Nie, Yijing

Subjects
POLYMER blends, MISCIBILITY, CRYSTALLIZATION
Abstract

In this simulation study, based on the control of simulation time during diffusion step, polymer blend systems with different initial mixing parameters (that is, segmental miscibility) can be obtained. Then, the formation of stereocomplex crystals (SCs) in those systems with different segmental miscibility was investigated. In this case, we can reveal the impact of segmental miscibility on the SC formation ability while excluding the influence of other factors, such as chain segment mobility and nucleation mode. It was observed that the systems with higher initial mixing parameters have stronger stereocomplexation ability. It was demonstrated that the local segment diffusion can also affect the SC formation. Enhanced chain segment diffusion in the polymer blend system can result in an increase in the local segmental miscibility, thus promoting the SC formation. [ABSTRACT FROM AUTHOR]

Published
2023
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