ADVANCED MATERIALS
·
2024
·Vol. 36
·期 36
·2401733
·
IF 27.4
Xin Wang,Xiaoming Chen,Qingyuan He,Yaozu Hui,Chaofan Xu,Baichuan Wang,Feihu Shan,Jie Zhang,Jinyou Shao
To obtain high-performance electromagnetic microwave (EM) absorption materials with broad effective absorption bandwidth ( EAB ) and reduced thickness, designing structures has proved to be a promising way. Herein, ultra-broadband multilayer bidirectional MXene/polyimide EM absorption aerogels containing multi-structures on scales ranging from the micro- to the macroscale are produced with the aid of electric and temperature fields. On the microscale, under the action of electric force and temperature gradient, the ordered structures made of aligned Ti 3 C 2 T x MXene nanosheets and the microscale layered aerogel walls enable the bidirectional aerogel to achieve a wide EAB of 8.58 GHz at a thickness of 2.1 mm. This is ascribed to the numerous aligned nanosheets and layered aerogel walls perpendicular to the incident EMs, facilitating the conversion of electromagnetic energy into electrical energy. Furthermore, on the macroscale, the multilayer bidirectional aerogel with non-gradient structures effectively resolves the conflict between impedance matching and energy loss, resulting in an ultrawide EAB of 9.41 GHz at a thickness of 3 mm. This innovative design of electric-field-assisted multilayer bidirectional aerogels with multiscale structural coupling may provide feasible and effective pathways for the development of advanced EM absorption materials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yangyang Gong,Pengtao Zhang,Shuang Fan,Minghui Cai,Jiangtao Hu,Zhaoyan Luo,Hongwei Mi,Xiantao Jiang,Qianling Zhang,Xiangzhong Ren
Ammonium vanadate with stable bi-layered structure and superior mass-specific capacity have emerged as competitive cathode materials for aqueous rechargeable zinc-ion batteries (AZIBs). Nevertheless, fragile N H…O bonds and too strong electrostatic interaction by virtue of excessive NH 4 + will lead to sluggish Zn 2+ ion mobility, further largely affects the electro-chemical performance of ammonium vanadate in AZIBs. The present work incorporates polypyrrole (PPy) to partially replace NH 4 + in NH 4 V 4 O 10 (NVO), resulting in the significantly enlarged interlayers (from 10.1 to 11.9 Å), remarkable electronic conductivity, increased oxygen vacancies and reinforced layered structure. The partial removal of NH 4 + will alleviate the irreversible deammoniation to protect the laminate structures from collapse during ion insertion/extraction. The expanded interlayer spacing and the increased oxygen vacancies by the virtue of the introduction of polypyrrole improve the ionic diffusion, enabling exceptional rate performance of NH 4 V 4 O 10 . As expected, the resulting polypyrrole intercalated ammonium vanadate (NVOY) presents a superior discharge capacity of 431.9 mAh g −1 at 0.5 A g −1 and remarkable cycling stability of 219.1 mAh g −1 at 20 A g −1 with 78 % capacity retention after 1500 cycles. The in-situ electrochemical impedance spectroscopy (EIS), in-situ X-ray diffraction (XRD), ex-situ X-ray photoelectron spectroscopy (XPS) and ex-situ high resolution transmission electron microscopy (HR-TEM) analysis investigate a highly reversible intercalation Zn-storage mechanism, and the enhanced the redox kinetics are related to the combined effect of interlayer regulation, high electronic conductivity and oxygen defect engineering by partial substitution NH 4 + of PPy incorporation.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 13
·期 1
·111
·
IF 2.972
Xia Zhao,Shuai Yuan,Zuquan Jin,Binbin Zhang,Nazhen Liu,Shibo Chen,Shuan Liu,Xiaolin Sun,Jizhou Duan
Given their outstanding versatile properties, multilayered anticorrosion coatings have drawn great interest from researchers in the academic and engineering fields. However, the application of multilayered coatings is restricted by some limitations such as low interlayer compatibilities, the harsh preparation process, etc. This work introduced a composite film fabricated on a 2A12 aluminum alloy surface, including an anodic oxide film, a sol–gel film, and a layer-by-layer (LBL) self-assembling film from bottom to top. The microstructure and elemental characterization indicated that the finish of the coating with the LBL film resulted in a closely connected multilayered coating with a smoother surface. The anticorrosion performance was systematically evaluated in the simulated corrosive medium and neutral salt spray environment. The integrated coating with the LBL film presented an excellent anticorrosion ability with system impedance over 108Ω·cm2and a self-corrosion current density two orders of magnitude lower than that of the other coatings. After the acceleration test in a salt spray environment, the multilayered coatings could still show a good protective performance with almost no cracks and no penetration of chloride ions. It is believed that the as-constructed multilayered coating with high corrosive properties and a fine surface state will have promising applications in the field of anticorrosion engineering.Keywords:multilayer;corrosion;impedance;layer-by-layer
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 28
·2302882
·
IF 15.1
Yanan Huang,Jibing Shen,Shuai Lin,Wenhai Song,Xuebin Zhu,Yuping Sun
High-quality few-layer M 4 C 3 T x (M = V, Nb, Ta) MXenes are very important for applications and are necessary for clarifying their physicochemical properties. However, the difficulty in etching for themselves and the existence of MC/MC 1−δ and M-Al alloy impurities in their M 4 AlC 3 precursors seriously hinder the achievement of defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) MXenes nanosheets. Herein, three different defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) nanosheets are obtained by using a universal synthesis strategy of calcination, selective etching, intercalation, and exfoliation. Comprehensive characterizations confirm their defect-free few-layer structure feature, large interlayer spacing (1.702–1.955 nm), types of functional groups (–OH, –F, –O), and abundant valance states (M 5+ , M 4+ , M 3+ , M 2+ , M 0 ). M 4 C 3 T x (M = V, Nb, Ta) free-standing films obtained by vacuum filtration of few-layer M 4 C 3 T x inks show good hydrophilia, high thermostability, and conductivity. A roadmap on synthesis of defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) nanosheets are proposed and three key points are summarized. This work provides detailed guidelines for the synthesis of other defect-free few-layer MXenes nanosheets, but also will stimulate extensive functional explorations for M 4 C 3 T x (M = V, Nb, Ta) MXenes nanosheets in the future.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xinxin Li,Min Yang,Wenjing Qin,Changshun Gu,Lei Feng,Zhenhao Tian,Hanying Qiao,Junji Chen,Jianxing Chen,Shougen Yin
With the development of wearable intelligent devices, flexible textiles integrate high-performance sensing, electromagnetic shielding and Joule heating show broad application prospects. However, it is still difficult to improve all the performance simultaneously through simple methods. Here, we have prepared MXene/PU composite fiber film with multilayer porous network structure by using the electrospinning spraying alternate operation process. This film has ultra-high sensitivity (GF= 77,751), super large detection range (400%) and ultra-low detection limit (0.05%). Secondly, the multilayer fiber film has excellent EMI shielding performance (EMI SE=38 dB), and the EMI shielding capacity of the multilayer film can still exceed the commercial standard when it is stretched to 20%. Finally, the multilayer fiber film shows better Joule heating performance, including lower voltage drive (2 V) and faster thermal response (12 s). The excellent performance of the composite come from the synergistic effect of MXene and the unique multi-layer porous network structure. Among them, MXene provides excellent conductivity, electrothermal and electromagnetic shielding performance. The layered porous network structure can store the strain in advance and form a parallel circuit, which improves the sensing range, increases the transmission path of electromagnetic waves , and realizes the homogeneity of Joule heating. In addition, the outer PU slows down the invasion of oxygen, thus slows down the oxidation of MXene, and ensures the performance of materials in a long time. The multilayer fiber film has been proved to be suitable for sensing at low temperature, and has broad application prospects in wearability.
研究领域:
材料科学
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电子工程
·
纺织科学
✓ 已验证
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Xinliang Li,Xiaowei Yin,Shuang Liang,Minghang Li,Laifei Cheng,Litong Zhang
High electrical conductivity and the layered structure features are desired for high-performance electromagnetic interference (EMI) shielding materials. Although 2D graphene has proven to be a promising EMI shielding material, the complex preparation, including the necessary reduction process accompanied by the sacrifice of functional groups, and subsequent structural design inevitably limit its practical application. Herein, conductive 2D Ti 2 CT X MXene with native sandwich-like structure and abundant surface functional groups is synthesized via a simple chemical etching process. The Ti 2 CT X MXene exhibits excellent EMI shielding performance which exceeds 70 dB at only 0.8 mm in X-band, surpassing most of reported graphene-based EMI shielding composites. The multilayered structure obviously strengthens the internal EM attenuation and greatly improves the absorption effectiveness, while the high electrical conductivity ensures sufficient EM reflection on the surface. In addition, the high conductivity, unique structure, and abundant surface functional groups make Ti 2 CT X MXene a promising candidate in energy storage and multifunctional composites application beyond EMI shielding.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2012
·Vol. 45
·期 3
·698-704
·
IF 1.18
Junfei Ou,Weihua Hu,Ying Wang,Fajun Wang,Mingshan Xue,Wen Li
A novel bilayer superhydrophobic film was constructed on Cu substrate by a simple multi-step process. First, (3-mercaptopropyl) trimethoxysilane (MPTMS) molecules were self-assembled onto the pre-etched Cu surface via covalent bonding followed by hydrolysis and condensation, then 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (PFDTS) were grafted onto the resultant hydroxyl terminated surface via the Si-O-Si bonding. The so-prepared sample was defined as Cu-MPTMS-PFDTS. The structure and morphology of the samples were characterized by means of contact angle measurement, X-ray photoelectron spectroscopy and scanning electron microscopy. The corrosion behaviors of the films were evaluated by Tafel plot and electrochemical impedance spectroscopy on an electrochemical work station. The results indicated that the bilayer superhydrophobic film possessed better corrosion protection as compared with the control samples. The superiority of the corrosion protection was mainly ascribed to the following two aspects: the superhydrophobicity and polysiloxane micro-structures of the Cu-MPTMS-PFDTS. Copyright © 2012 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Mengzhu Liu,Yongpeng Wang,Pengchong Li,Zhiqiang Cheng,Yongqiang Zhang,Mingyue Zhang,Meijuan Hu,Junfeng Li
NiO with multilayer structure was prepared by impregnating electrospun polylactic acid (PLA) nanofibrous webs with nickel acetate solution and subsequent calcination. From SEM images, it can be observed that the structures of NiO products from surface to center were nanogrooves inlaid film, hollow pores and honeycomb-like nanofibers with nanogrooves, successively. The formation mechanisms were studied in detail by TGA and DSC. FT-IR and XRD measurements demonstrated that the product was highly pure NiO with cubic structure. The sensitivity of the NiO products to formaldehyde was investigated. As a result, the multilayer NiO exhibited much higher sensing signal than NiO powders. This indicated that the prepared multilayer NiO could be used as a candidate to fabricate formaldehyde sensors.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Miao Liu,Ruizhe Huang,Yongqian Shi,Peihui Xu,Shiwei Xie,Libi Fu,Jiefeng Gao,Longcheng Tang,Pingan Song
Rigid polyurethane foam (RPUF) shows great application potential in the fields of architecture, household, and transportation due to its lightweight, durability, and excellent heat insulation. However, it remains challenging to construct flame-retardant and impact-resistant RPUF composites with good thermal insulation through a facile approach. Herein, multifunctional hierarchical RPUF composites were prepared by simple one-pot foaming and brush-coating methods. Due to the hierarchical structure and multifunctional polyborosiloxane/phytic acid/polyethylenimine (PBS/PAP) coating, the as-created foams displayed excellent fire safety and impact resistance. For instance, the peak of heat release rate and total heat release of the RPUF composite with the PBS/PAP coating decreased by 70.1 and 57.0%, respectively, relative to those of pure RPUF. Furthermore, the composite showed good heat insulation and improved thermal stability performance. This work offers a paradigm for the design of multifunctional RPUF composites with outstanding fire resistance, impact resistance, and heat insulation properties, which represent prospective potential in safety protective materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Ying Shang,Youxin Ji,Jingwen Dong,Gui Yang,Xiaodong Zhang,Fengmei Su,Yuezhan Feng,Chuntai Liu
The rapid development of electronic devices has led to widespread demand and research on electronic packaging materials with electromagnetic shielding and thermal conductivity (TC) properties due to the inevitable issues of the electromagnetic radiation and thermal accumulation. However, there exists a huge challenge to simultaneously achieve high electromagnetic shielding and TC as well as the electrical insulation requirement as electromagnetic shielding predominantly relies on electrical conductivity of materials. Multilayer structure can endow composite materials with a variety of properties. Therefore, in this work, we fabricated sandwiched cellulose nanofiber/boron nitride nanosheet/Ti 3 C 2 T x MXene films by using a simple and effective alternating vacuum filtration method, and as a result, the special sandwich structure endows the film with excellent electromagnetic shielding, insulation and TC performance. The composite film has an extremely high electromagnetic shielding effectiveness up to 60.7 dB at 8.2 GHz as well as still maintains good electrical insulation properties due to the presence of the CNF/BNNS layer on the surface. Moreover, when the content of BNNS in the CNF/BNNS layer reaches 70 wt%, the sandwiched film has excellent in-plane TC of 19.97 W m −1 K −1 . The sandwiched film with excellent electromagnetic shielding and high TC yet insulation performance has great application value in highly integrated electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2022
·Vol. 12
·期 2
·845-853
·
IF 3.074
Jian Wang,Jian Wang,YanBo Pei,Hongyan Shi,Bo Gao,Suhua Luo
We reveal that polymerization degree is a significant factor that affects the holographic properties of glass-like photopolymer. By modulating polymerization degree, as well as changing the photosensitizer concentration, we fabricate multilayer PQ/PMMA photopolymer, exhibiting excellent performances in storage fidelity and reproduction resolution. A reflection geometry holographic disk system is established using the multilayer sample, in which a high storage density of 40.5GB/cm3 is realized. The reproduced images exhibit high quality with an average diffraction efficiency of 7.4 × 10−4 and average peak SNR of 27.4. This study provides a paradigm for the fabrication and holographic application of other photopolymers.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yali Zhang,Hongwei Zhang,Fei Xiao
Active aluminum composites are ideal choices for portable hydrogen sources and are playing an increasingly important role in the field of emergency response. The hydrogen production rate from their reaction with water is a key factor determining the practical application effectiveness of these materials. This study thoroughly investigates the catalytic effects of four ammonium salts on the hydrogen production rate of active aluminum composites in water reactions. By incorporating four types of ammonium salts (Al/Bi/NH 4 Cl, Al/Bi/(NH 4 ) 2 C 2 O 4 , Al/Bi/(NH 4 ) 2 CO 3 , and Al/Bi/NH 4 H 2 PO 4 ) along with bismuth into aluminum powder and preparing them through ball milling, four types of active aluminum composites were obtained. A detailed analysis was conducted on the microstructures of these composites and their hydrogen production performance in water reactions. The results show that NH 4 Cl can form a multilayer structure on the surface of Al/Bi/NH 4 Cl, allowing this composite to exhibit the best hydrogen production performance, reaching a maximum hydrogen production rate of 14.4 mL g −1 s −1 and a maximum hydrogen volume of 948 mL g −1 at 45 °C. Additionally, the mechanisms by which different ammonium salts influence the hydrogen production rate of active aluminum composites in water reactions were discussed in detail. The unique multilayer structure of Al/Bi/NH 4 Cl and the excellent solubility of NH 4 Cl contribute to accelerating particle rupture and enhancing the reaction rate. More importantly, H + ions released from the hydrolysis of NH 4 Cl can neutralize OH − produced during the reaction, effectively controlling the pH value of the reaction medium, preventing the deposition of aluminum hydroxide on the aluminum surface, and thus maintaining a larger reaction surface area and continuous reaction activity. The study shows that adjusting the types of ammonium salts can effectively regulate the water reaction kinetics of active aluminum composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）