APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 10
·1-8
·
IF 1.81
Guo Tong,Li Changgeng,Wang Yue,Wang Yi,Yue Jianling,Tang Xiu-Zhi
There is usually a tough trade-off between the mechanical property and the shielding performance in electromagnetic interference shielding (EMI) materials, especially for those ultrathin and porous film-based devices. Herein, we report an ultrathin and flexible RGO/CNF@Ag–Fe 3 O 4 (RGCF) porous film for EMI shielding application by a vacuum-assisted filtration method and a hydrazine-induced foaming process. The RGCF-3 porous film exhibits outstanding mechanical properties with a tensile strength of 175.5 MPa. As expected, the EMI shielding effectiveness of the lightweight RGCF-3 porous film (21.0 dB) is much higher than that of the compact film (10.4 dB), due to the improved efficient wave attenuation within the cellular space. Therefore, the flexible and lightweight RGCF porous film with applicable EMI shielding and superior mechanical strength is highly promising for applications in wearable electronics.
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高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 11
·9717-9740
·
IF 2.87
Wu Guangfeng,Song Xin,Yang Zhihui,Li Yingchun,Zhang Huixuan
Waterborne polyurethane (WPU) prepolymer with acrylate terminal was prepared by using hydroxyethyl acrylate as an end-capping agent. Modified gelatin (mGH) was prepared by grafting vinyl groups which were obtained from hydrolysis and condensation of vinyl trimethoxysilane onto the renewable natural polymer material cold-water fish skin gelatin. Due to the excellent biodegradability and mechanical properties of cold-water fish skin gelatin, mGH was introduced into the WPU backbone by covalent bonding to improve WPU comprehensive property. The vinyl groups in mGH and the acrylate ends in the WPU prepolymer were connected by UV curing to prepare biodegradable and renewable mGH/WPU chemical hybrid materials. The test results showed that the film-forming properties, the water resistance and thermal stability of WPU were improved by covalent bonding. Water contact angle increased from79.6° to 96.5°, and the maximum thermal degradation rate temperature increased from 340 to 400 °C. In addition, incorporation of mGH with high modulus improved the moduli and yield strength of WPU, in which the yield strength increased from 11.3 to 18.2 MPa. The degradation performance of mGH/WPU chemical hybrid materials was also evaluated that the degradation rate reached 68% in 0.6% lipase PBS solution and 56% in soil after 60 days. The study provides a novel polymerization method for preparing high biodegradable decorative coatings and prints of specialty metals, polymer plastics and certain types of woodware as well as medical scaffold materials. Graphical abstract
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CHEMICAL PAPERS
·
2022
·Vol. 76
·期 6
·3627-3638
·
IF 2.146
Li Guo-Wei,Lan Yu-wei,Peng Yi-qin,Bao Wen-bin,Zhou Li-ya
Green-fluorescent nitrogen-doped carbon quantum dots (g-CQDs) were synthesized via a simple and convenient one-step hydrothermal method using Passiflora edulis sims shell as a carbon source and m-phenylenediamine as a nitrogen source and applied to the detection of uric acid. Unlike most reported blue fluorescent probes, the obtained g-CQDs showed bright-green fluorescence under ultraviolet light with a high quantum yield of 37.6%. Moreover, the g-CQDs exhibit outstanding photostability and high sensitivity, an excellent linearity ranging from 1 to 17 µM, and a great limit of detection of 0.94 µM, which renders them suitable for the determination of uric acid in human urine with remarkable selectivity.
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CELLULOSE
·
2020
·Vol. 27
·期 7
·4133-4144
·
IF 4.21
Yang Huiyu,Li Ke,Liu Weiqiang,Liu Xin,Xu Weilin,Deng Bo
SiO 2 nanoparticles were synthesized by the Stober method. Their diameters were finely tuned from 250 to 580 nm by varying the NH 3 ·H 2 O and tetraethyl orthosilicate (TEOS) concentrations. SiO 2 particles with different diameters were assembled onto the surface of cotton fabric via the layer-by-layer electrostatic self-assembling method to achieve structural colored fabrics. The surface morphologies of the synthesized SiO 2 particles and structural colored cotton fabrics were analyzed by scanning electron microscopy. The chemical composition of SiO 2 particles was analyzed by Fourier transform infrared spectroscopy and X-ray diffraction. The thermal properties and color properties of structural color fabrics were analyzed by thermogravimetric analysis, UV reflectance spectroscopy and spectrophotometer.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 7
·2471-2480
·
IF 4.478
Zhang Hanqiang,Li Yufei,Lu Haixin,Gan Feng
A new dual-mode ratiometric fluorescence and colorimetric probe for selective determination of Cu 2+ was developed based on blue-emission sulfur quantum dots (SQDs) and yellow-emission carbon quantum dots (CQDs). The fluorescence and absorbance of CQDs increased in the presence of Cu 2+ due to the Cu 2+ -oxidized o-phenylenediamine group on the surface of the CQDs. Because of the inner filter effect between SQDs and CQDs-Cu 2+ , the fluorescence response of SQDs decreased following the introduction of Cu 2+ . Furthermore, in the presence of Cu 2+ , the dual-mode SQD–CQD probe showed visible color changes under both ultraviolet light and sunlight. Under optimal conditions, the dual-mode probe was used to quantitatively detect Cu 2+ with a linear range of 0.1–5.0 μM for ratiometric fluorescence and colorimetry, with a limit of detection of about 31 nM and 47 nM, respectively. Finally, the dual-mode probe was used for the determination of Cu 2+ in practical samples to expand the practical application, and the difference between ratiometric fluorescence and colorimetric methods was compared. The recovery results confirmed the high accuracy of the dual-mode probe, showing that it has immense potential for sensitive and selective detection of Cu 2+ in practical samples. Graphical abstract
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PubMed
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-8
·
IF 14.919
Wan Quan,Yang Mei,Hu Jiaqi,Lei Fang,Shuai Yajun,Wang Jie,Holland Chris,Rodenburg Cornelia,Yang Mingying
Silk fibre mechanical properties are attributed to the development of a multi-scale hierarchical structure during spinning. By careful ex vivo processing of a B. mori silkworm silk solution we arrest the spinning process, freezing-in mesoscale structures corresponding to three distinctive structure development stages; gelation, fibrilization and the consolidation phase identified in this work, a process highlighted by the emergence and extinction of ‘water pockets’. These transient water pockets are a manifestation of the interplay between protein dehydration, phase separation and nanofibril assembly, with their removal due to nanofibril coalescence during consolidation. We modeled and validated how post-draw improves mechanical properties and refines a silk’s hierarchical structure as a result of consolidation. These insights enable a better understanding of the sequence of events that occur during spinning, ultimately leading us to propose a robust definition of when a silkworm silk is actually ‘spun’.
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PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 10
·1-9
·
IF 2.584
Meng Ke,Li Wenhua,Tang Xingui,Guo Xiaobin,Liu Qiuxiang,Jiang Yanping
Ferroelectric materials with the typical perovskite structure are widely used in capacitors, ultrasonic devices, oil drilling, transducers, and other fields. Lead-lanthanum-zirconium-titanate ceramics co-doped with Sn and Ba , have been widely investigated. However, there is little attention has been focused on the dielectric properties of barium-lanthanum-zirconium-titanate. Thus, in this work, Sn doped Ba 0.955 La 0.03 Zr 0.02 Ti 0.98 O 3 ferroelectric ceramics were prepared via a classical high-temperature solid state reaction. Scanning Electron Microscopy (SEM) was used to observe the surface appearance of ceramics. The X-ray diffraction (XRD) patterns at room temperature, indicate that the ceramics are well crystallized. Impedance properties and dielectric properties reflect the characteristic of typical high temperature dielectric relaxation behavior. The conductive activation energy and the relaxation activation energy are obtained through the calculation of the Arrhenius law. The fitting results show that the dielectric relaxation behavior at high-temperature, was related to the oxygen defect. The electrical modulus verified the partial short-range carrier migration, also contribute to the high-temperature dielectric properties.
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高影响因子
Biochar
·
2022
·Vol. 4
·期 1
·1-17
·
IF 11.452
Che Naiju,Liu Na,Li Yinhui,Li Chao,Liu Yanli,Li Chengliang
Graphene-based composite aerogel doped with other low-cost materials can reduce the cost and promote the use in water treatment. This work prepared ball-milled biochar/reduced graphene oxide aerogel (BC/rGA) using GO and low-cost ball-milled biochar (BC) in a certain proportion with the freeze-thawing technique and sol–gel method, and applied BC/rGA on the Cr(VI) removal from aquatic environments. The characterization results showed that aerogel had a honeycomb briquette three-dimension (3D) and mesoporous structure with interconnected pores, and proved the preparation progress of aerogel in principle. Compared with GO, rGA and BC/rGA had better adsorption performance with 3D structure and well-developed pores, and BC/rGA with the mixture ratio of BC and GO of 1:4 was more appropriate. The adsorption kinetics data of rGA and BC/rGA (1:4) were fitting well with the pseudo-second-order model ( R 2 > 0.951), and the isotherm adsorption results were fitting the Langmuir model well ( R 2 > 0.974). The results demonstrated that the adsorption process was monolayer and endothermic adsorption involving chemisorption. Additionally, the adsorption capacities of rGA and BC/rGA (1:4) at solution pH 2 were 3.71 and 3.89 times greater than those at solution pH 8, respectively. High background ion strength and low temperature slightly inhibited the adsorption of Cr(VI) by both rGA and BC/rGA (1:4) . The adsorption mechanisms of Cr(VI) on rGA and BC/rGA (1:4) were electrostatic interaction, reduction and ion exchange. The use of BC/rGA could reduce the cost and promote the green reuse of agricultural waste. Overall, BC/rGA could be used as a promising green adsorbent alternative for the feasible treatment of heavy metal contaminated water. Graphical Abstract
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高影响因子
RARE METALS
·
2023
·
IF 8.8
Zhang Lei,Meng Qian-Kun,Feng Xiang-Ping,Shen Ming,Zhang Yu-Qing,Zhuang Quan-Chao,Zheng Run-Guo,Wang Zhi-Yuan,Cui Yan-Hua,Sun Hong-Yu,Liu Yan-Guo
The high energy density and stability of solid-state lithium metal batteries (SSLMBs) have garnered great attention. Garnet-type oxides, especially Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO), with high ionic conductivity, wide electrochemical window, and stability to Li metal anode, are promising solid-state electrolyte (SSEs) materials for SSLMBs. However, Li/LLZTO interface issues including high interface resistance, inhomogeneous Li deposition, and Li dendrite growth have hindered the practical application of SSLMBs. Herein, a multi-functional Li–SnF 2 composite anode with Li, LiF, and Li-Sn alloy was specifically designed and prepared. The composite anode improves the wettability to LLZTO, constructing an intimate contact interface between it and LLZTO. Meanwhile, ionic/electronic conductive paths in situ formed at the interface can effectively uniform Li deposition and suppress Li dendrite. The solid-state symmetric cell exhibits low interface resistance (11 Ω·cm 2 ) and high critical current density (1.3 mA·cm −2 ) at 25 °C. The full SSLMB based on LiFePO 4 or LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode also shows stable cycling performance and high rate capability. This work provides a new composite anode strategy for achieving high-energy density and high-safety SSLMBs. Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 19
·8845-8853
·
IF 4.682
Shu Ling,Liu Wei,Deng Hong-Bin
Integrating energetic materials with microelectromechanical systems (MEMS) to realize miniaturized energetic chips has shown broad application prospects in micro-spacecraft, micro-satellites, ballistic correction munitions, and smart munitions. In this work, a new type of MEMS compatible Cu/ICM-101 energetic film was successfully fabricated on copper substrates by in-situ electrochemical synthesis, the morphology and ignition property of which can be effectively controlled by adjusting the voltage and electrochemical deposition time. The morphology, composition, thermal properties, and ignition performance of as-prepared Cu/ICM-101 films were characterized by scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, and pulsed laser. The results show that the as-prepared Cu/ICM-101 films possesses nano porous framework structure with an exothermic heat of 1800.9 J·g −1 and a thermal decomposition peak temperature of 256.4 °C. In addition, the flame height and ignition duration of which reach 10 mm and 300 μs, respectively. This work provides a reference for the integration and application of energetic materials in MEMS systems.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 94
·期 2
·393-405
·
IF 2.008
Zhao Ruoxi,Xu Huifang,Zhong Zhengxiang,Xu Hao,Zhang Haijiao
Resorcinol–formaldehyde (RF) aerogels are widely used as thermal insulation materials. The present investigation of RF aerogels emphases on improving hydrophobic property and high-temperature residual yields. In this study, polysiloxane-modified RF composite xerogel monoliths were prepared by gelation of poly(methylphenylsiloxane) prepolymer with RF in cosolvent and ambient pressure drying. The influence of phenyl content on structure and thermal property of xerogels was investigated. The as-prepared RF composite monoliths were lightweight and hydrophobic with density lower than 0.300 g/cm 3 and water contact angles approaching 130°. Morphology analyses indicated that polysiloxane grew and formed a continuous layer on RF porous skeleton with controlled reaction parameter. Thermogravimetry analyses (TGA) certified that the controlled incorporation of polysiloxane in composite xerogels enhanced the thermal degradation temperature at which the weight loss of RF xerogels reaches 5% ( T 5% ) and increased the residual yields at 1000 °C. The carbonized derivatives were obtained for further enhancing the thermal stability by removal of small molecules during carbonization. Xerogel monoliths preserved hydrophobic property till 500 °C carbonization due to the thermal stability of poly(methylphenylsiloxane). The heat-resistant composite xerogels remained monolith structure after 800 °C treatment under nitrogen condition.
The prepared composite xerogels were lightweight, hydrophobic, and thermal resistant. The hydrophobic property was preserved for 500 °C-carbonized derivatives. The heat-resistant composite xerogels remained monolith structure after 800 °C carbonized treatment under nitrogen condition.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Zhang Jinmeng,Yan Jianlong,Zhao Yanan,Zhou Qiang,Ma Yinxing,Zi Yaxian,Zhou Anan,Lin Shumin,Liao Longhui,Hu Xiaolan,Bai Hua
Load bearing/energy storage integrated devices (LEIDs) allow using structural parts to store energy, and thus become a promising solution to boost the overall energy density of mobile energy storage systems, such as electric cars and drones. Herein, with a new high-strength solid electrolyte, we prepare a practical high-performance load-bearing/energy storage integrated electrochemical capacitors with excellent mechanical strength (flexural modulus: 18.1 GPa, flexural strength: 160.0 MPa) and high energy storage ability (specific capacitance: 32.4 mF cm −2 , energy density: 0.13 Wh m −2 , maximum power density: 1.3 W m −2 ). We design and compare two basic types of multilayered structures for LEID, which significantly enhance the practical bearing ability and working flexibility of the device. Besides, we also demonstrate the excellent processability of the LEID, by forming them into curved shapes, and secondarily machining and assembling them into complex structures without affecting their energy storage ability.
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高影响因子
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