Search

Your search keyword '"Luo, Heming"' showing total 145 results
Start Over Author "Luo, Heming"
145 results on '"Luo, Heming"'

10. Strengthening‐Durable Trade‐Off and Self‐Healing, Recyclable Shape Memory Polyurethanes Enabled by Dynamic Boron–Urethane Bonds.

Author

Zhang, Qingxiang, Yang, Jing, Cao, Pengrui, Gong, Junhui, Tang, Zhangzhang, Zhou, Kai, Luo, Heming, Zhang, Xinrui, Wang, Tingmei, Chen, Shoubing, Pei, Xianqiang, Wang, Qihua, and Zhang, Yaoming

Subjects
SHAPE memory polymers, DYNAMIC mechanical analysis, WASTE recycling, COVALENT bonds, REINFORCEMENT (Psychology)
Abstract

Addressing the demand for integrating strength and durability reinforcement in shape memory polyurethane (SMPU) for diverse applications remains a significant challenge. Here a series of SMPUs with ultra‐high strength, self‐healing and recyclability, and excellent shape memory properties through introducing dynamic boron–urethane bonds are synthesized. The introducing of boric acid (BA) to polyurethane leading to the formation of dynamic covalent bonds (DCB) boron–urethane, that confer a robust cross‐linking structure on the SMPUs led to the formation of ordered stable hydrogen‐bonding network within the SMPUs. The flexible crosslinking with DCB represents a novel strategy for balancing the trade‐off between strength and durability, with their strengths reaching up to 82.2 MPa while also addressing the issue of durability in prolonged usage through the provision of self‐healing and recyclability. The self‐healing and recyclability of SMPU are demonstrated through rapid dynamic exchange reaction of boron–urethane bonds, systematically investigated by dynamic mechanical analysis (DMA). This study sheds light on the essential role of such PU with self‐healing and recyclability, contributing to the extension of the PU's service life. The findings of this work provide a general strategy for overcoming traditional trade‐offs in preparing SMPUs with both high strength and good durability. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

24. Preparation and electrochemical properties of self-doped nitrogen porous carbon derived from Zn-MOFs

Author

Zhang, Dongqiang, Zhang, Chi, Wang, Qian, Li, Shuai, Zhao, Xia, and Luo, Heming

Abstract

Metal–organic frameworks (MOFs) are network-like frameworks composed of transition metals and organic ligands containing oxygen or nitrogen. Because of its highly controllable composition and ordered porous structure, it has broad application prospects in the field of material synthesis. In this work, Zn4(PYDC)4(DMF)2∙3DMF (ZPD) was synthesized via a hydrothermal method. Self-doped nitrogen porous carbon ZPDC-T was then prepared by one-step carbonization. The results show that the self-doped nitrogen porous carbon ZPDC-850 has a micro/mesoporous structure with a specific surface area of 1520 m2g−1and a nitrogen content of 6.47%. When a current density is 1.0 A g−1, its specific capacitance is 265.1 F g−1. After 5000 times of constant current charging and discharging, the capacitance retention rate was 79.2%. Thus, self-doped nitrogen porous carbon ZPDC-850 exhibits excellent electrochemical properties and good cyclic stability. Therefore, the self-doped nitrogen porous carbon derived from MOFs can be a promising electrode material for supercapacitors.

Published
2024
Full Text
View/download PDF

33. Preparation and electrochemical characteristics of metal–organic framework [Zn (NH2-bdc) (4,4′-bpy)]-derived porous carbon.

Author

Chen, Xinguo, Wang, Pitao, Chen, Xiaoyi, Zhang, Qingxiang, Zhang, Jianqiang, and Luo, Heming

Abstract

Porous carbon is one of the favorable materials for electrodes in supercapacitors owing to its huge particular area of the surface, high intensity, and stable characteristics of chemistry. The metal–organic framework [Zn (NH2-bdc) (4,4′-bpy)] was synthesized using the hydrothermal method. The porous carbon ZNBC-T-A was synthesized through the chemical activation of ZnCl2. Further, whether the micromorphology and electrochemical characteristics of porous carbon ZNBC-T-A are related to the carbonization temperature and ZnCl2 activator ratio was investigated. The results showed that the porous carbon ZNBC-700-1:3 had a hive-like architecture with a particular area of the surface of 2078 m2 g−1. The activator ZnCl2 entered the pores of the precursor as a template, which prevented the pores from collapsing. This template served as a template agent. When the current density was 1.0 A g−1, the porous carbon ZNBC-700-1:3 exhibited a specific capacitance of 210.6 F g−1. The retention of capacitance was 90.5% after 5000 repetitions, while coulomb efficiency was kept at nearly 100%. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

46. Removal Of Methylene Blue From Aqueous Solution Using Expanded Perlite

Author

Luo Heming, Li Xiang, Zhao Xia, Zhang Hang, and Yabin Li

Subjects
Aqueous solution, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Adsorption, Wastewater, chemistry, Perlite, 0210 nano-technology, Methylene blue, Nuclear chemistry
Published
2017

Catalog

Books, media, physical & digital resources
See catalog results