APPLIED PHYSICS LETTERS
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2021
·Vol. 118
·期 18
·
IF 3.791
Yin Feng,Yan Kelan,Shen Liming,Bao Ningzhong
Random metamaterial with negative electric permittivity ( ε < 0) and negative magnetic permeability ( μ < 0) is a group of attractive alternatives to ordered double negative metamaterials (DNMs) with periodic unit cells; however, the preparation of random DNMs with a relatively convenient preparation process and their electromagnetic property adjustment are of challenge. Here, we report the preparation of metallic ferromagnetic selenospinel composites, x CdCr 2 Se 4 ·(1− x )CuCr 2 Se 4 , from metallic powders by using a simple solid-state reaction process, and double negative ε and μ have been observed in the frequency range of 120–650 MHz for 0.2CdCr 2 Se 4 ·0.8CuCr 2 Se 4 and 73–520 MHz for 0.4CdCr 2 Se 4 ·0.6CuCr 2 Se 4 . The negative ε is owing to the plasmonic state of delocalized carriers in the metallic ferromagnetic CuCr 2 Se 4 , which can be described with the Drude model. The suppression of the magnetic resonance induced by the eddy current has been alleviated by the proper addition of the paramagnetic semiconductor CdCr 2 Se 4 . A theoretical model deduced from Maxwell's equation has been constructed based on the skin effect to elucidate the magnetic resonance-dependent negative permeability. Our work introduces the metallic ferromagnetic chalcospinels into the field of random DNMs and sheds light on the theoretical understanding and tuning mechanism on the double negative properties.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Xin Liu,Peng Xu,Qi Fu,Runhan Li,Chenxi He,Wenxuan Yao,Lei Wang,Shiqi Xie,Zhiyi Xie,Jingwei Ma,Qiulai He,John C. Crittenden
Zero-valent copper activated peroxymonosulfate (ZVC/PMS) system was widely used to degrade refractory contaminants due to being highly effective. However, the low reactivity and easy dismutation of cuprous species (Cu(I)) in acid condition limited its efficiency. In our study, ZVC coupled with ferrous ion (Fe(II)) promoted PMS to degrade orange II. Multiple oxidants including Cu(III), OH and SO 4 − made main contribution on orange II degradation in the Fe(II)/ZVC/PMS system. In the Fe(II)/ZVC/PMS system, ZVC generated Cu(I) by H + corrosion and PMS oxidation, and Cu(I) reacted with oxygen producing hydrogen peroxide. Then, Fe(II) and Cu(I) catalyzed hydrogen peroxide and PMS to generate Cu(III), OH and SO 4 − , and thereinto Fe(III) was reduced to Fe(II) by ZVC and Cu(I). In the Fe(II)/ZVC/PMS system, water matrix including humic acid, sulfate and nitrate had no significant impact on orange II degradation, while chloride restrained the degradation of orange II. The Fe(II)/ZVC/PMS system exhibited great degradation for orange II in tap water, lake water and well water. Additionally, the Fe(II)/ZVC/PMS system degraded more than 90% of methyl orange, rhodamine B, acetaminophen, ibuprofen, propranolol and diclofenac. Through adjusting the final reaction solution to pH 8.5 and subsiding, the discharge of total copper met the II-level environmental quality standards for surface water in China (1 mg/L). Hence, the study provided a promising method to induce PMS for enhanced degradation of contaminants.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2021
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IF 6.291
Min Kang,Jie Luo,Ling Zhao,Fei Shi,Gang Ye,Xiaoli He,Suqi Hao,Dan Yang,Helin Chen,Hongrui Guo,Yinglun Li,Huaqiao Tang
Nano-copper (nano-Cu) is widely used in the pharmaceutical field as well as a feed additive for animals owing to its unique physicochemical characteristics and bioactivities. In our previous study, nano-Cu was found to hamper fetal development; however, the toxicity of nano-Cu and its effects in placental function have not been elucidated. Therefore, we investigated the toxic effects of nano-Cu using rat placenta. Pregnant Sprague-Dawley rats were orally exposed to different copper sources from the third day of gestation (GD 3) to GD 18. We found that nano-Cu (180 mg/kg) and CuCl 2 .2 H 2 O increased the accumulation of copper. Besides, nano-Cu and CuCl 2 .2 H 2 O disrupted the placental morphology and induced oxidative stress. Micro-copper (micro-Cu) caused similar toxicity in the placenta, but its effects were weaker than that of nano-Cu and CuCl 2 .2 H 2 O. In addition, exposure to nano-Cu (180 mg/kg) and CuCl 2 .2 H 2 O induced inflammation in the rat placenta. Furthermore, nano-Cu, micro-Cu, and CuCl 2 .2 H 2 O upregulated the expression of the autophagy-related proteins, Beclin-1 and LC3 II/ LC3 I, and downregulated that of p62. Moreover, nano-Cu, micro-Cu, and CuCl 2 .2 H 2 O downregulated the protein expression of PI3K, p-AKT/AKT, and p-mTOR/mTOR in rat placentas, whereas the protein expression of p-AMPK/AMPK was upregulated. Taken together, our data indicated that prenatal exposure to nano-Cu induced autophagy via the PI3K/AKT/mTOR and AMPK/mTOR pathways, which associated with oxidative stress and inflammation in rat placenta.
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 10
·2009869
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IF 18.808
Wu Bin Ying,Guyue Wang,Zhengyang Kong,Chen Kai Yao,Yubin Wang,Han Hu,Fenglong Li,Chao Chen,Ying Tian,Jiawei Zhang,Ruoyu Zhang,Jin Zhu
Polymeric elastomers play an increasingly important role in the development of stretchable electronics. A highly demanded elastic matrix is preferred to own not only excellent mechanical properties, but also additional features like high toughness and fast self-healing. Here, a polyurethane (DA-PU) is synthesized with donor and acceptor groups alternately distributed along the main chain to achieve both intra-chain and inter-chain donor-acceptor self-assembly, which endow the polyurethane with toughness, self-healing, and, more interestingly, thermal repair, like human muscle. In detail, DA-PU exhibits an amazing mechanical performance with elongation at break of 1900% and toughness of 175.9 MJ m −3 . Moreover, it shows remarkable anti-fatigue and anti-stress relaxation properties as manifested by cyclic tensile and stress relaxation tests, respectively. Even in case of large strain deformation or long-time stretch, it can almost completely restore to original length by thermal repair at 60 °C in 60 s. The self-healing speed of DA-PU is gradually enhanced with the increasing temperature, and can be 1.0–6.15 µm min −1 from 60 to 80 °C. At last, a stretchable and self-healable capacitive sensor is constructed and evaluated to prove that DA-PU matrix can ensure the stability of electronics even after critical deformation and cut off.
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CORROSION SCIENCE
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2020
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IF 6.479
Xiaobang Liu,Ting Yue,Kai Qi,Bao Yu Xia,Zhenyu Chen,Yubing Qiu,Xingpeng Guo
Metal-organic framework (MOF) membranes as anticorrosion coatings are fabricated onto diverse metal surfaces via a versatile approach based on utilization of polydopamine layer, whose strong adhesion and metal-chelating capabilities promote heterogeneous nucleation and growth of MOF membranes. The anticorrosion property of MOF membranes has been achieved owing to characters of well-intergrown crystals, compact structure, hydrophobicity and effective rejection of corrosive ions of MOF membranes, and would be affected by MOF crystal size, membrane thickness and metal substrate. This study may shed some valuable light on the construction of MOF-based protective coatings as qualified and important candidates for high-performance anticorrosion applications.
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COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Guichen Song,Qihuang Deng,Bo Wang,Zhiduo Liu,Chen Ye,Xianzhe Wei,Dan Dai,Zhongbin Pan,Wei Li,Shulin Song,Li Fu,Cheng-Te Lin,Nan Jiang,Jinhong Yu
In virtue of its excellent performance and abundant surface terminations, MXenes, a newly emerged 2D materials , greatly exhibit promising applications in many fields of energy storage and electromagnetic shielding. Ti 3 C 2 , a member of MXenes, is widely investigated in recent years. However, lack for attention in thermal property and corrosion behavior. Here, Copper matrix composites were prepared by Spark Plasma Sintering , in which TiC and few-layer Ti 3 C 2 nanosheets as filler. The results exhibit corrosion resistance of the Ti 3 C 2 /Cu composites were improved compared to TiC/Cu composites, benefiting from outstanding electrical conductivity and easily oxidized property of Ti 3 C 2 . However, the thermal conductivity of Ti 3 C 2 /Cu composite with the content of 2 wt% Ti 3 C 2 improves about 15% compared to TiC/Cu composites with same content, resulting from the low inherent thermal conductivity of filler and lattice mismatch between copper and filler. Moreover, the electrical resistance of Ti 3 C 2 /Cu composites increases about 100% with the content of 2 wt% Ti 3 C 2 at interfacial contact resistance measurement compared with pure Cu. Meanwhile, the anti-corrosion performance of the Ti 3 C 2 /Cu composites was improved over pure Cu. This work will broaden appliance field of Ti 3 C 2 and lay the foundation for the future research.
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ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Ling Zhang,Hongjun Ji,Houbing Huang,Ning Yi,Xiaoming Shi,Senpei Xie,Yaoyin Li,Ziheng Ye,Pengdong Feng,Tiesong Lin,Xiangli Liu,Xuesong Leng,Mingyu Li,Jiaheng Zhang,Xing Ma,Peng He,Weiwei Zhao,Huanyu Cheng
A soft body area sensor network presents a promising direction in wearable devices to integrate on-body sensors for physiological signal monitoring and flexible printed circuit boards (FPCBs) for signal conditioning/readout and wireless transmission. However, its realization currently relies on various sophisticated fabrication approaches such as lithography or direct printing on a carrier substrate before attaching to the body. Here, we report a universal fabrication scheme to enable printing and room-temperature sintering of the metal nanoparticle on paper/fabric for FPCBs and directly on the human skin for on-body sensors with a novel sintering aid layer. Consisting of polyvinyl alcohol (PVA) paste and nanoadditives in the water, the sintering aid layer reduces the sintering temperature. Together with the significantly decreased surface roughness, it allows for the integration of a submicron-thick conductive pattern with enhanced electromechanical performance. Various on-body sensors integrated with an FPCB to detect health conditions illustrate a system-level example.
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Nanoscale
·
2020
·Vol. 12
·期 39
·20536-20542
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IF 6.895
Jie Chen,Taoyi Liu,Deyu Bao,Bin Zhang,Guang Han,Can Liu,Jun Tang,Dali Zhou,Lei Yang,Zhi-Gang Chen
Searching for new-type, eco-friendly, and Earth-abundant thermoelectric materials, which can be used as an alternative to the high-cost bismuth telluride, is important for near-room-temperature applications. In this work, nanostructured monoclinic Cu2Se with a low carrier concentration has been synthesized by a wet mechanical alloying process combined with spark plasma sintering. Such a low carrier concentration, which originates from the effectively suppressed Cu deficiencies during the fabrication process, induces a relatively low electrical conductivity and carrier thermal conductivity. Besides, the nanostructured grains combined with point defects and phonon resonance enhance the phonon scattering to induce a low lattice thermal conductivity without sacrificing the electrical transport properties. As a result, our nanostructured monoclinic Cu2Se obtains a figure of merit of 0.72 at 380 K with good thermal stability. This work indicates that nanostructured monoclinic Cu2Se is a promising near-room-temperature thermoelectric material.
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Polymer Chemistry
·
2020
·Vol. 11
·期 40
·6529-6538
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IF 5.342
Xiaoqiang Xue,Yangjing Chen,Kang Liang,Wenyan Huang,Hongjun Yang,Li Jiang,QiMin Jiang,Bibiao Jiang,Hongting Pu
The ring-forming behavior of polymers with an odd number of arms in highly dilute solutions has been studied using tri-arm polystyrene (PSt3) as a model through combining atom transfer radical polymerization (ATRP) and atom transfer radical coupling (ATRC) technologies. The star polymer, PSt3, with three arms and a central core was obtained by ATRP of styrene using a designed initiator with three active Br terminals and ester groups, followed by the Br terminal–Br terminal radical coupling of PSt3, which was implemented via intramolecular ATRC under high dilution conditions. A tadpole-shaped cyclic polymer (tadpole-PSt) was successfully prepared, proving that there no intermolecular side reactions that occur during the intramolecular ATRC of PSt3. Interestingly, the tadpole-PSt not only possesses a cyclic topology, but also contains a living chain, in contrast to other cyclic analogues that have been previously reported. Finally, the tadpole-PSt was used as a building block to construct a type of barbell polymer (barbell-PSt) by removing most of the solvent via vacuum distillation at the end of the intramolecular ATRC of PSt3. Size exclusion chromatography, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, 1H nuclear magnetic resonance spectroscopy and hydrolysis experiments proved that high-purity cyclic polymers (tadpole-PSt and barbell-PSt) were successfully prepared. The thermal properties of the cyclic and star polymers were analyzed using differential scanning calorimetry and thermogravimetric analysis. The results demonstrated that the formation of a cyclic topology makes a huge contribution to the increase in the glass transition temperature (Tg) and thermal stability of the polymer.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fenglong Li,Zifa Xu,Han Hu,Zhengyang Kong,Chao Chen,Ying Tian,Wenwu Zhang,Wu Bin Ying,Ruoyu Zhang,Jin Zhu
Two of the very important demands for the elastic matrix of electronic skin (E-skin) are durability and degradability, which ensure the stable performance in daily life and green end of the E-skin. Unfortunately, these two requirements are usually incompatible. Here, we proposed the idea of controlled degradation and synthesized a polyurethane, AL-PU-4, to solve such challenge. High crystalline hydroxy-terminated poly (1,4-butylene adipate) (HTPBA) and low crystalline polycaprolactone diol (PCL diol) were mixed and used as the degradable soft segment. The dynamic disulfide bond was chosen as the chain extender, which could simultaneously endow the polyurethane with anti-aging and self-healing properties. The AL-PU-4 didn’t show significant loss in mechanical and molecular weight after 12 days of accelerated aging experiment, which equaled to 12 months of daily use, and it owned a fast room temperature self-healing speed of 1.31 μm/min. With the steric protection of the hard segment, the degradation of ester bonds in HTPBA and PCL diol segments was seriously retarded under enzymatic and low pH conditions. Only when the pH reached 14, the ‘lock’ on degradation was opened. The above functionalities were also verified in an E-skin demo, which could response the external pressure quickly and show high stability in cyclic test.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lanlan Gan,Qian Su,Zhangbao Chen,Xiaoming Yang
Detections of carcinogen and vitamins are generally recognized to be meaningful, especially for nitrites (NO 2 − ) and ascorbic acid (AA). Here blue-fluorescence carbon dots (CDs) with the quantum yield of 11.83% were successfully synthesized by using folic acid and nicotinic acid, and their surfaces were identified to be abundant in the functional groups of amide, carboxyl and hydroxyl. Importantly, the amide on the surfaces of CDs showed the interactions with the nitrites and formed the complex, thus resulting in their quenched fluorescence. To be specific, the fluorescence intensity of CDs proportionally decreased by adding the increased amounts of NO 2 − from 8 to 800 μM, and achieved the detection of NO 2 − at a detection limit of 21.2 µM. Moreover, further introducing ascorbic acid could prevent CDs with NO 2 − to form the complex and recover their fluorescence, and thus providing the new avenue of assaying AA with the generally favorable linear range of 0.1–800 μM, while its related detection limit was 50 µM. In addition, the synthesized CDs exhibited the satisfactory sensitivity toward different pH values, demonstrating their potential of sensing pH. Consequently, the proposed CDs here may provide a new way of monitoring NO 2 − and AA in the target samples.
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SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
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2020
·
IF 3.086
Zhe Ye,Zhenghao Zhu,Ning Ma,Xiaohua Wang,Dingxin Liu,Aijun Yang,Huan Yuan,Mingzhe Rong
The deterioration of transformer oil caused by particle contamination, especially copper particle, seriously affects the safe operation of oil-immersed transformers. Therefore, it is very important for the detection of metal particles in transformer oil. A new method based on laser-induced breakdown spectroscopy (LIBS) was first applied in the transformer oil diagnosis field. By screening out effective spots, the correlation between Cu particle concentration and LIBS signal was obtained after testing a set of oil samples with concentration range from 0.54 to 12.4 μg/g; the calibration curves of Cu I 324.75 nm /CN 358.6 nm and Cu I 327.39 nm /CN 358.6 nm were therefore established. The results shown high linearity, and the determination coefficient R 2 of the two calibration curves in range from 0.54 to 3.1 μg/g were superior to 0.99. The limit of detection (LOD) inferred from Cu I 324.75 nm /CN 358.6 nm fitting curve was 0.77 μg/g and met the critical value specified by industry standards. Due to its flexibility, it can be used as a new-type of particle concentration detection method for transformer oil.
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危险品化学品经营许可证（带存储）