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Zhang W, Xu Y, Ma J, He J, Ye H, Song J, Chen Y, Xu L. Efficient, Robust, and Flame-Retardant Electrothermal Coatings Based on a Polyhedral Oligomeric Silsesquioxane-Functionalized Graphene/Multiwalled Carbon Nanotube Hybrid with a Dually Cross-Linking Structure. ACS APPLIED MATERIALS & INTERFACES 2023; 15:4430-4440. [PMID: 36629289 DOI: 10.1021/acsami.2c18040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Graphene electrothermal coatings have attracted considerable attention in recent years due to their important application prospects in a broad range of areas. So far, lots of strategies have been explored for producing them. However, these strategies usually involve a complicated process with sophisticated conditions, limiting their scalable applications. Herein, we demonstrate a facile strategy for preparing efficient, robust, and flame-retardant electrothermal coatings from liquid-phase exfoliated graphene, by combining with multiwalled carbon nanotubes (MWCNTs) and polyhedral oligomeric silsesquioxane (POSS) nanoparticles. This relies on the use of a hyperbranched polyethylene copolymer that simultaneously bears UV-reactive moieties and POSS terminal groups. As a stabilizer, the copolymer can effectively promote the exfoliation of both graphite and MWCNTs in common organic solvents under sonication, rendering the POSS-functionalized graphene and MWCNTs well dispersible in the solvent. From their dispersions, POSS-functionalized graphene/MWCNT hybrid electrothermal coatings have been successfully prepared simply by vacuum filtration and UV irradiation under mild conditions. It has been confirmed that a dually cross-linking structure can be formed in the hybrid system. This significantly improves the thermal resistance of resultant coatings, which remain exhibiting a stable work state even at a temperature high as 280 °C without the occurrence of flammation. Meanwhile, this also endows them with excellent electrothermal performance and service stability. At a relatively low voltage, 15 V, the steady temperature can reach 188.4 °C, with a response time < 30 s; after being alternately folded for 2700 cycles or scraped 200 times, the coating still maintains a stable state. In particular, the process involved is relatively simple with mild conditions. With these features, the coatings obtained herein may find their important applications in the area of wearable devices and household heating systems.
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Affiliation(s)
- Wenbin Zhang
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou310014, China
- Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu314200, China
| | - Yuanjie Xu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou310014, China
- Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu314200, China
| | - Junjie Ma
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou310014, China
- Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu314200, China
| | - Jie He
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou310014, China
- Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu314200, China
| | - Huijian Ye
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou310014, China
- Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu314200, China
| | - Jinwei Song
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou310014, China
- Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu314200, China
| | - Yulong Chen
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou310014, China
| | - Lixin Xu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou310014, China
- Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu314200, China
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Lv XQ, Li XY. Melting at Mg/Al interface in Mg-Al-Mg nanolayer by molecular dynamics simulations. NANOTECHNOLOGY 2022; 33:145701. [PMID: 34937008 DOI: 10.1088/1361-6528/ac45c1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 12/22/2021] [Indexed: 06/14/2023]
Abstract
The melting at the magnesium/aluminum (Mg/Al) interface is an essential step during the fabrications of Mg-Al structural materials and biomaterials. We carried out molecular dynamics simulations on the melting at the Mg/Al interface in a Mg-Al-Mg nanolayer via analyzing the changes of average atomic potential energy, Lindemann index, heat capacity, atomic density distribution and radial distribution function with temperature. The melting temperatures (Tm) of the nanolayer and the slabs near the interface are significantly sensitive to the heating rate (vh) over the range ofvh ≤ 4.0 K ps-1. The distance (d) range in which the interface affects the melting of the slabs is predicted to be (-98.2, 89.9) Å atvh→0,if the interface is put atd = 0 and Mg (Al) is located at the left (right) side of the interface. TheTmof the Mg (Al) slab just near the interface (e.g.d=4.0Å) is predicted to be 926.8 K (926.6 K) atvh→0,with 36.9 K (37.1 K) below 963.7 K for the nanolayer. These results highlight the importance of regional research on the melting at an interface in the nanolayers consisting of two different metals.
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Affiliation(s)
- Xue-Qi Lv
- School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, People's Republic of China
- Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, People's Republic of China
| | - Xiong-Ying Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, People's Republic of China
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Hu T, Ye H, Luo Z, Ma J, Zhang B, Zhang X, Song J, Wang Q, Xu L. Efficient exfoliation of UV-curable, high-quality graphene from graphite in common low-boiling-point organic solvents with a designer hyperbranched polyethylene copolymer and their applications in electrothermal heaters. J Colloid Interface Sci 2020; 569:114-127. [PMID: 32105899 DOI: 10.1016/j.jcis.2020.02.068] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/11/2020] [Accepted: 02/16/2020] [Indexed: 10/25/2022]
Abstract
The use of stabilizer with designer structures can effectively promote graphite exfoliation in common solvents to render functionalized graphene desirable for their various applications. Herein, a hyperbranched polyethylene copolymer, HBPE@Py@Acryl, simultaneously bearing multiple pyrene terminal groups and pendant acryloyl moieties has been successfully synthesized from ethylene with a Pd-diimine catalyst based on unique chain walking mechanism. The unique structural design of the HBPE@Py@Acryl makes it capable of effectively promote graphite exfoliation in a series of common, low-boiling-point organic solvents, e.g. CHCl3, to render stable graphene dispersions with concentrations effectively adjustable by changing feed concentrations of graphite and polymer or sonication time. Meanwhile, it can be irreversibly adsorbed on the exfoliated graphene surface based on the π-π interactions between them to concurrently render acryloyl-functionalized graphene free of structural defects, with majority (92.7%) of them having a thickness of 2-3 layers. This allows us to obtain graphene electrothermal films simply by filtration and UV irradiation, which exhibit outstanding stability in use. The action mechanism of the HBPE@Py@Acryl as stabilizer for promoting graphite exfoliation and the role of UV irradiation on improving the stability in use of resulting graphene films have been elucidated.
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Affiliation(s)
- Te Hu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Huijian Ye
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu 314212, China.
| | - Zhenggang Luo
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Junjie Ma
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Boyuan Zhang
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xuanhe Zhang
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Jinwei Song
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Qingping Wang
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Lixin Xu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Pinghu Institute of Advanced Materials, Zhejiang University of Technology, Pinghu 314212, China.
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