Surface modification of carbonyl iron particles using dopamine and silane coupling agent for high-performance magnetorheological elastomers

Zhao, Jun; Li, Dongliang; Sun, Baojie; Jiang, Liang; Zhou, Yanfen; Wen, Shipeng; Jerrams, Stephen; Ma, Jing; Chen, Shaojuan

doi:10.1016/j.polymertesting.2023.107935

Cited by 11 publications

(5 citation statements)

References 36 publications

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“…To address these issues, we proposed a facile synthetic strategy to prepare gradient hydrophobic MPLs. In our previous work, we found that superhydrophobicity of MPL can be achieved via a chemical modification. , In this study, dodecyltrimethoxysilane (DTMS), a compound with long-chain molecular structure and low surface energy, is employed as a hydrophobic agent. , After the hydrolysis of silane, dehydration and condensation reactions occur, forming long-chain groups. The hydroxyl groups on the long chain undergo a covalent cross-linking reaction with the hydroxyl groups on the surface of conductive carbon black, grafting hydrophobic groups onto the surface of carbon black.…”

Section: Introductionmentioning

confidence: 99%

Gradient Hydrophobic Microporous Layer for High-Performance Proton-Exchange Membrane Fuel Cells

Wang,

Guo,

et al. 2024

Energy Fuels

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The hydrophobicity of microporous layers (MPLs) plays an important role in water management and performance enhancement of proton-exchange membrane fuel cells (PEMFCs). In this study, we demonstrate a facile synthetic strategy for preparing a gradient hydrophobic MPL. The superhydrophobicity of the MPL is achieved by chemically grafting carbon black with dodecyltrimethoxysilane (DTMS). The MPL with gradient hydrophobicity is constructed with hydrophobic DTMS-functionalized carbon black integrated with a fine proportion of hydrophilic carbon black, demonstrating advanced water drainage capability. As employed in a PEMFC, the as-fabricated gradient hydrophobic MPL shows a significantly improved performance compared to a single hydrophobic MPL. The PEMFC loaded with the optimum gradient hydrophobic MPL delivers maximum power densities of 860.7 and 733.5 mW cm −2 at relative humidities (RHs) of 30 and 60%, respectively. The results presented herein provide a new strategy for the construction of gradient hydrophobic MPLs for adaptable PEMFCs.

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Section: Introductionmentioning

confidence: 99%

Gradient Hydrophobic Microporous Layer for High-Performance Proton-Exchange Membrane Fuel Cells

Wang,

Guo,

et al. 2024

Energy Fuels

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“…Non-magnetic fillers commonly consist of reinforcing agents, [13][14][15] plasticizers, 16 and crosslinking agents. 17 In a related study, Zhao et al 18 Polydopamine (PDA) deposition and dodecyltrimethoxysilane (DTMS) grafting techniques were utilized to modify the surface of CI particles. 19 After the surface modification of CI particles, the study demonstrated a notable 31.5% increase in the tensile strength of anisotropic MREs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the performance of dopamine‐modified carbon fiber‐reinforced natural rubber‐based magneto‐rheological elastomers

Yue,

Liang,

et al. 2024

Polymer Composites

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Five types of magneto‐rheological elastomers (MREs) based on natural rubber were synthesized by incorporating carbonyl iron particles (CIP) as the primary filler. The objective was to investigate the influence of carbon fiber and magnetic particle content on the mechanical and magneto‐rheological properties of the MREs. Carbon fibers (CF) were further added as secondary reinforcement pre‐modified with polydopamine. The composite's microstructure was examined through scanning electron microscopy (SEM), while the mechanical and magnetodynamic properties were assessed using an electronic universal testing machine and an advanced rotational rheometer. The addition of appropriate amounts of CIP and CF resulted in increased rubber modulus, indicating the formation of a filler‐rubber network and the synergistic effect between carbon fibers as a supporting structure and CIP. Compared to the unfilled MREs, the mechanical and magnetodynamic properties were further improved by adding 2 and 4 wt% CF. These findings demonstrate that employing carbon fibers as reinforcing fillers and incorporating suitable magnetic fillers can enhance the magnetic and mechanical properties of the materials, providing a theoretical basis for the study of MREs' performance.Highlights CF and CIP synergistically enhance the strength of the rubber matrix. The MR effect is gradually enhanced with the increase of CIP content. Modified CF has a promoting effect on the magnetic responsivity. Magnetic responsivity increases with increasing modified CF content. Improved mechanical and magnetodynamic properties of composites.

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“…However, lack of noncovalent interactions between the filler and the rubber matrix was the main reason that limited further mechanical enhancement in rubber composites. − Therefore, surface treatment of fillers was an important strategy to optimize the interfacial connection of the composite. Taking carbon black as an example, it is the most common filler used in rubber reinforcement and has been consumed for a large amount per year. , Due to the porous and fractal structure of carbon black, significant physical entanglement of rubber molecule chains always occurs with a carbon black filler with receptible interfacial combination. − With increasing demands in the field of rubber composites, it was gradually found that simple physical entanglement was not enough to meet further optimization of rubber products; hence, surface treatment of carbon black is also needed to induce stronger interfacial combination of the composite, like chemical grafting, − etching, , and surface coating. , However, due to the high proportion in the formula of the rubber product, surface treatment of carbon black needs rapidity; thus, complex chemical processing is not suitable in industrial application. In addition, strategies like etching and surface coating still stay in the stage of enhancing interfacial wettability between carbon black and the rubber matrix; hence, an efficient surface treatment strategy is still needed in carbon black pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Covulcanizing of Fluorinated Carbon Black Ability with Styrene Butadiene Rubber Combining Enhanced Low- and Wide-Frequency Microwave Absorption

Lv,

Wang,

Yang

et al. 2023

Ind. Eng. Chem. Res.

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A high-performance soft microwave absorption composite with excellent mechanical strength is needed at advanced equipment manufacturing. In this article, fluorinated carbon black (FCB) was demonstrated to generate active radicals at high temperature via in situ electron paramagnetic spectroscopy (in situ EPR), which could spontaneously vulcanize styrene butadiene rubber (SBR) as confirmed by differential scanning calorimetry (DSC) and Mooney viscosity. An SBR composite containing a single FCB filler without any other additives exhibited good mechanics as the tensile strength reached 10.15 MPa. Utilizing the excellent interfacial properties of FCB, it was found that an FCB-enhanced SBR composite with all necessary additives could further obtain a higher tensile strength of 14.76 MPa, which was increased by 43.02% compared with pristine carbon black-filled composite. Due to the improved impedance matching and richer loss mechanism, the FCB-enhanced SBR composite also exhibited better microwave absorption properties as the effective bandwidth (reflection loss ← 10 dB) could reach 6.43 GHz at maximum since multipeak absorption contains S, X, and Ku bands, which is much better than the signal and narrow absorption of pristine carbon blackenhanced composites. Herein, it was suggested that utilizing direct fluorination to simultaneously couple mechanic and electromagnetic fields would be an effective strategy to fabricate excellent structural-functional composites.

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Surface modification of carbonyl iron particles using dopamine and silane coupling agent for high-performance magnetorheological elastomers

Cited by 11 publications

References 36 publications

Gradient Hydrophobic Microporous Layer for High-Performance Proton-Exchange Membrane Fuel Cells

Gradient Hydrophobic Microporous Layer for High-Performance Proton-Exchange Membrane Fuel Cells

Investigation of the performance of dopamine‐modified carbon fiber‐reinforced natural rubber‐based magneto‐rheological elastomers

Covulcanizing of Fluorinated Carbon Black Ability with Styrene Butadiene Rubber Combining Enhanced Low- and Wide-Frequency Microwave Absorption

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