Multifunctional microcellular PVDF/Ni-chains composite foams with enhanced electromagnetic interference shielding and superior thermal insulation performance

Zhang, Hongming; Zhang, Guangcheng; Gao, Qiang; Meng, Tao; Ma, Zhonglei; Qin, Jianbin; Wang, Mingyue; Kim, Jang Kyo

doi:10.1016/j.cej.2019.122304

Cited by 208 publications

(76 citation statements)

References 73 publications

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“…The results showed that the foams outperformed the solid samples, presenting higher conductivities and lower percolation threshold, 0.4 vol % compared to 0.9 vol %. This obtained percolation threshold is in a suitable range compared to other conductive nanocomposite foams [7,9,33,44]. This behavior has previously been ascribed to a decrease in the interparticle distances between the MWCNTs and to an increase of the MWCNT contacts and orientation due to the biaxial extensional stretching during the cells' growth [9,10,19].…”

Section: Resultssupporting

confidence: 54%

“…Stationary measurements showed thermal conductivity variations from 0.185 W/(m•K) to 0.267 W/(m•K) for the unfilled and 10 phr MWCNTs in the solid materials, respectively, and from 0.069 to 0.206 W/(m•K) for their foamed counterparts, respectively ( Figure S5). The obtained value is higher compared to the reported values for most of the foamed nanocomposites prepared for EMI application [11,14,32,33]. Hence, MWCNTs increased the thermal conductivity of the EPDM up to nearly 45% and 200% for the solid and foamed samples, respectively.…”

Section: Resultsmentioning

confidence: 54%

“…It is worth mentioning that, above the percolation threshold (≥ 4 phr), foamed samples exhibited higher SE A compared to their solid counterparts (Figure 6a). Meanwhile, below the percolation threshold, no significant differences were observed between the solid and foam samples [33]. Thus, although the key factor governing the EMI SE is the conductive network, the observed change of the cellular structure, i.e., decreased cell size and increased cell density, should also affect it.…”

Section: Resultsmentioning

confidence: 92%

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Highly Deformable Porous Electromagnetic Wave Absorber Based on Ethylene–Propylene–Diene Monomer/Multiwall Carbon Nanotube Nanocomposites

et al. 2020

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The need for electromagnetic interference (EMI) shields has risen over the years as the result of our digitally and highly connected lifestyle. This work reports on the development of one such shield based on vulcanized rubber foams. Nanocomposites of ethylene–propylene–diene monomer (EPDM) rubber and multiwall carbon nanotubes (MWCNTs) were prepared via hot compression molding using a chemical blowing agent as foaming agent. MWCNTs accelerated the cure and led to high shear-thinning behavior, indicative of the formation of a 3D interconnected physical network. Foamed nanocomposites exhibited lower electrical percolation threshold than their solid counterparts. Above percolation, foamed nanocomposites displayed EMI absorption values of 28–45 dB in the frequency range of the X-band. The total EMI shielding efficiency of the foams was insignificantly affected by repeated bending with high recovery behavior. Our results highlight the potential of cross-linked EPDM/MWCNT foams as a lightweight EM wave absorber with high flexibility and deformability.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 92%

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Highly Deformable Porous Electromagnetic Wave Absorber Based on Ethylene–Propylene–Diene Monomer/Multiwall Carbon Nanotube Nanocomposites

et al. 2020

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“…The crystallinity and bond states of the as‐prepared samples are confirmed by XRD and XPS measurement. From the overall spectrum of ZnFe 2 O 4 @MnO 2 (Figure 3B), the presence elements of Zn (3d, 3s, 2p), Fe (3s, 2p), Mn (2p), O (1s, KLL), and C (1s) could be easily pointed out, demonstrating its high‐sample purity . The O 1s XPS spectra from ZnFe 2 O 4 and MnO 2 given in Figure 3F show three distinguishable peaks centered at 529.9, 531.5, and 533.2 eV, assigning to metal‐O and O–H bonds from TMD and C–O and CO bonds from the substrate, respectively .…”

Section: Resultsmentioning

confidence: 93%

“…From the overall spectrum of ZnFe 2 O 4 @MnO 2 ( Figure 3B), the presence elements of Zn (3d, 3s, 2p), Fe (3s, 2p), Mn (2p), O (1s, KLL), and C (1s) could be easily pointed out, demonstrating its high-sample purity. [24][25][26] The O 1s XPS spectra from ZnFe 2 O 4 and MnO 2 given in Figure 3F show three distinguishable peaks centered at 529.9, 531.5, and 533.2 eV, assigning to metal-O and O-H bonds from TMD and C-O and C O bonds from the substrate, respectively. 27,28 Meanwhile, the N 2 adsorption/ desorption measurements are also used to determine porous structures and the specific area of as-prepared materials, which indicates that the large specific surface area can accelerate the electrochemical reaction rate, and the uneven pore size can provide numerous transport channels for Li + ions and electrons.…”

Section: Resultsmentioning

confidence: 99%

A novel flower‐like metal‐based oxides with cross‐linked networks for rapid lithium‐ion storage

et al. 2020

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Summary A cross‐linked MnO2 coated ZnFe2O4 hollow nanosphere composite is synthesized and controlled via a facial and handy route. The connected MnO2 nanoplates form a cross‐linked network, which is conducive to the rapid transfer of Li ions. The composite with unique architecture can not only release the strain and stress caused by the insertion and desertion of lithium ions but also greatly improve the electrical conductivity and lithium ion diffusivity. Consequently, when used as a lithium‐ion battery anode material, the electrode shows an excellent initial reversible capacity of 933.5 mAh/g with an initial coulombic efficiency of 62.5%. After 100 cycles, the reversible capacity stabilized at 605.6 mAh/g with a high capacity retention of 91% from the 20th cycle to the 100th cycle. At a high current density of 3 A/g, an excellent capacity of 390.6 mAh/g can be retained. In this case, the electrode shows broad application prospects for novel power storage systems.

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3D‐Printed Polyurethane Tissue‐Engineering Scaffold with Hierarchical Microcellular Foam Structure and Antibacterial Properties

et al. 2022

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This work proposes a facile fabrication strategy of polyurethane (TPU) tissue‐engineering scaffold with hierarchical structure, designed by combination of the fused deposition modeling (FDM) 3D printing and supercritical microcellular foaming by carbon dioxide (CO2). Further surface modification of TPU scaffold with graphene oxide (GO) was carried out by in situ polymerization of polydopamine (PDA) to ensure stable loading of GO with antibacterial properties. The influence of 3D‐printing temperature and speed on the microcellular cell morphology of TPU scaffold was investigated and optimized. The microcellular foaming and expansion process was indicated to compensate mechanical loss because of the gaps of stacking layers by FDM printing, and the reported tensile strength of 28 MPa matched well with that of natural cartilage tissue constructs. More interesting, the formation of interconnected open pores on the surface of foamed TPU scaffold shows much more enhanced cell adhesion because of the bigger specific surface area of microcellular structure. Similarly, the foamed TPU scaffold exhibits good absorption of GO nanosheets by the synthesized PDA on the surface and antibacterial properties, compared with the unfoamed TPU scaffold. This work offers a strategy for designing and manufacturing polymer tissue‐engineering scaffold with hierarchical structure and good antibacterial property.

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Multifunctional microcellular PVDF/Ni-chains composite foams with enhanced electromagnetic interference shielding and superior thermal insulation performance

Cited by 208 publications

References 73 publications

Highly Deformable Porous Electromagnetic Wave Absorber Based on Ethylene–Propylene–Diene Monomer/Multiwall Carbon Nanotube Nanocomposites

Highly Deformable Porous Electromagnetic Wave Absorber Based on Ethylene–Propylene–Diene Monomer/Multiwall Carbon Nanotube Nanocomposites

A novel flower‐like metal‐based oxides with cross‐linked networks for rapid lithium‐ion storage

3D‐Printed Polyurethane Tissue‐Engineering Scaffold with Hierarchical Microcellular Foam Structure and Antibacterial Properties

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