CHEMOSPHERE
·
2021
·
IF 7.086
Limei Xu,Zhilin Zhao,Zhen Yan,Gaoxiang Zhou,Wenming Zhang,Yong Wang,Xiaochen Li
Numerous studies have been investigated the toxic effects of silver nanoparticle (Ag-NPs) on algae; however, little attention has been paid to the defense pathways of algae cells to Ag-NPs. In the study, Chlamydomonas reinhardtii ( C. reinhardtii ) was selected as a model organism to investigate the defense mechanisms to Ag-NPs exposure. The results showed that exopolysaccharide and protein in bound-extracellular polymeric substances significantly increased under Ag-NPs stress. These metal-binding groups including C–O–C (exopolysaccharide), CH 3 /CH 2 (proteins), O–H/N–H (hydroxyl group) and C–H (alkyl groups) played a key role in extracellular biosorption. The internalized or strongly bound Ag (1.90%–17.45% of total contents) was higher than the loosely surface biosorption (0.31%–1.79%). The accumulation of glutathione disulfide (GSSG), together with the decline of reduced glutathione/GSSG (GSH/GSSG) ratio in C. reinhardtii cells, indicated a significant oxidative stress caused by exposure of Ag-NPs. The increasing phytochelatin accompanied with the decreasing GSH level indicated a critical role to intracellular detoxification of Ag. Furthermore, upregulation of antioxidant genes ( MSOD , QTOX2 , CAT1 , GPX2 , APX and VTE3 ) can cope with oxidative stress of Ag-NPs or Ag + . The up-regulation of ascorbate peroxidase ( APX ) and glutathione peroxidase ( GPX2 ) genes and the reduction in GSH contents showed that the toxicity of Ag-NPs could be mediated by an intracellular ascorbate-GSH defense pathway. These findings can provide valuable information on ecotoxicity of Ag-NPs, potential bioremediation and adaptation capabilities of algal cells to Ag-NPs.
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PubMed
高影响因子
Crystals
·
2021
·Vol. 11
·期 12
·1573
·
IF 2.589
Xiaoqing Si,Xiaoyang Wang,Chun Li,Tong Lin,Junlei Qi,Jian Cao
Reactive air brazing has been widely used in fabricating solid oxide fuel/electrolysis cell (SOFC/SOEC) stacks. However, the conventional Ag–CuO braze can lead to (I) over oxidation at the steel interconnect interface caused by its adverse reactions with the CuO and (II) many voids caused by the hydrogen-induced decomposition of CuO. The present work demonstrates that the Ag particle interlayer can be used to join yttria-stabilized zirconia (YSZ) electrolytes to AISI 441 interconnect in air instead of Ag–CuO braze. Reliable joining between YSZ and AISI 441 can be realized at 920 °C. A dense and thin oxide layer (~2 μm) is formed at the AISI 441 interface. Additionally, an interatomic joining at the YSZ/Ag interface was observed by TEM. Obtained joints displayed a shear strength of ~86.1 MPa, 161% higher than that of the joints brazed by Ag–CuO braze (~33 MPa). After aging in reducing and oxidizing atmospheres (800 °C/300 h), joints remained tight and dense, indicating a better aging performance. This technique eliminates the CuO-induced issues, which may extend lifetimes for SOFC/SOEC stacks and other ceramic/metal joining applications.Keywords:solid oxide fuel/electrolysis cells;sintering;YSZ;Ag particle interlayer;aging
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高影响因子
Small
·
2021
·Vol. 18
·期 5
·2104368
·
IF 13.281
Xin Yang,Changqing Zhang,Dawei Deng,Yueqing Gu,Huan Wang,Qifeng Zhong
Chronic wound healing is an important and basic issue in medical and healthcare fields. Recently, stimuli-responsive hydrogel systems have emerged as promising drug delivery carriers for wound management. However, given to the limited therapeutic outcomes, new hydrogel systems for efficient wound treatment are urgently needed. Here, the development of a 2D MXene-based hydrogel system for highly efficient photo- and magnetic-responsive drug delivery oriented to deep chronic wounds repair is presented. The intelligent responsive MXene-based hydrogel drug delivery system is composed of MXene-wrapped magnetic colloids and poly( N -isopropyl acrylamide)-alginate dual-network hydrogels. It is demonstrated that the MXene-based hydrogel system exhibits multiple response capability and controllable drug delivery ability, which can reduce the toxic side effects of drugs and promote the wound healing process as well. Notably, the practical performance of the MXene-based hydrogel drug delivery system is demonstrated by applying it to the treatment of the full-thickness cutaneous wound and subcutaneous infected wound of the rat model, which indicates the great prospect in clinical wound healing and other related biomedical fields.
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PubMed
高影响因子
DESALINATION
·
2023
·
IF 9.9
Chuqing Cao,Fengnan Liu,Fangqing Li,Onyeagoro Robinson Uzochukwu,Lin Chen
Membrane distillation (MD) is a promising desalination technology that combines traditional distillation processes with membrane separation technology , but when the feed solution contains amphiphilic substances such as surfactant, the hydrophobic membrane is prone to being wetting, which hinders its widespread application. In this study, a novel Janus membrane was developed by embedding Zr-MOF and silver nanowires into the modified graphene oxide composite membrane to improve its separation performance, and the effect of high-concentration SDS on the membrane performance was studied. The experimental results showed that the conductive membrane exhibited excellent performance when powered on for 5 min every 2.5 h under 2 V voltage. The flux stabilized at 19.6 L/(m 2 h) with a desalination rate up to 99.9 % and no obvious signs of membrane wetting. It was found that the effect of electric field caused a negative charge on the membrane surface , forming a charge repulsion force with the SDS. Simultaneously, intermittent electrical flotation can effectively remove SDS that has accumulated on the membrane surface, thus achieving efficient and stable operation of MD system. Moreover, a machine learning approach with Catboost was applied to predict and unveil the complex effects on membrane performance, providing a deep insight to treat wastewater containing surfactant.
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高影响因子
Nano Energy
·
2023
·
IF 17.6
Xingyi Dai,Qihua Liang,Zi-Han Zhao,Yinghui Wu,Jingkun Yang,Jiaxin Han,Yajun Cao,Yiping Wang,Cheng-Hui Li,Aihua Zhong,Long-Biao Huang
With the advancements in electronic skins (E-skins) and communication technologies, the applicability of sensors in extreme environments poses significant challenges. While various sensors have been reported, maintaining electrical output performance without external power source and self-healing capability across multiple extreme environments remains a hurdle. Herein, we present flexible, self-healing, and harsh environment-resistant self-powered sensors for E-skins, the self-healing capabilities of which are virtually invulnerable in diverse extreme environments, including underwater, saline, oxidized, alkali, and acid conditions, as well as low and high temperatures. The self-powered sensors are composed of self-healing polyurea (SH-PUrea) and Ag nanowires (AgNWs). Since physical entanglements that are less susceptible to environmental influences are introduced in SH-PUrea, the self-powered sensors exhibit exceptional self-healing performance without degradation of the output signals, regardless of the ambient conditions or extreme environments encountered. Specifically designed in a 3 × 3 pixel array structure, the self-powered sensors are ideal for E-skins that can adapt to sweaty and underwater environments. The detection of pressure position and underwater communication can be achieved by analyzing the electrical signals from the sensor array. This work introduces a novel strategy for enhancing the extreme environment-resistance and durability of flexible devices.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Qing Liu,Jie Zhou,Qi Zeng,Dexin Sun,Bin Yu,Liangtao Yang,Zhilin Zhang,Jinglong Wu,Yi Zhang
Electrodes or sensors based on silver nanowires (AgNWs) are gaining increasing value in diverse fields such as health monitoring, smart devices, body movement monitoring, and biomedical applications. However, pure AgNWs tend to degrade over time when exposed to an ambient atmosphere, severely limiting the mechanical and electrical performances of AgNW-based electrodes. Here, we take AgNWs and poly(dimethylsiloxane) (PDMS) as the basic research materials and employ a simple displacement reaction and spin-coating process to prepare one-dimensional platinum-coated AgNWs/PDMS (Pt-AgNWs/PDMS) flexible electrodes. The as-prepared electrodes display comparable electrical conductivity (∼1.65 S/cm), stability (40 min of continuous ultrasound), and flexibility (2500 repetitions of cyclic stretching) compared to pure AgNWs/PDMS electrodes. The resistance even remains consistent at the initial state after 12000 s in a H2SO4 etching medium, indicating that the anticorrosive property of Pt can further enhance the durability and stability of the electrodes. Moreover, the low contact impedance (33.1 kΩ at 1 kHz) of Pt-AgNWs/PDMS electrodes facilitates the capture of various physiological signals, including electrooculogram (EOG), electrocardiogram (ECG), and electromyogram (EMG), which is suitable for applications requiring stable long-term recording. Thus, the proposed strategy shows potential, and Pt-AgNWs are expected to be an ideal material for the fabrication of next-generation high-performance epidermal electrophysiological electrodes.
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高影响因子
RARE METALS
·
2023
·Vol. 42
·期 11
·3741-3754
·
IF 8.8
Jiang Zhao-Yi,Pan Ming,Ren Fu-Meng,Chen Rui,Sun Zhen-Xing,Yang Zhi-Chun,Liu Zong-Hao,Chen Wei
Perovskite solar cells (PSCs) have attracted widespread attention because of their remarkable efficiency, low cost, and ease of fabrication. However, the operational stability of the PSCs still suffers from the corrosion of metal electrodes induced by metal-halide reactions. Herein, we propose a feasible strategy for improving the stability of inverted PSCs by using magnetron-sputtered Mo rear electrodes. Coupled with a bismuth (Bi) buffer layer prepared by thermal evaporation, the damage from the magnetron sputtering process toward the underlayers can be effectively relieved. Consequently, based on the Bi + Mo bilayer electrode, the inverted PSCs with a NiMgLiO hole transport layer exhibited a power conversion efficiency (PCE) of 18.82%. In addition to their excellent stability at high temperatures, compact Mo films can inhibit the decomposition of Perovskite (Pvk) films in the devices. The PSCs with the Bi/Mo bilayer electrode maintained 97.9% of its initial efficiency, showing better stability than PSCs with the traditional Ag electrode after aging for 3000 h under continuous light illumination. Graphic abstract
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Abubakar Yakubu Haruna,Yubo Luo,Zheng Ma,Wang Li,Haiqiang Liu,Xin Li,Qinghui Jiang,Junyou Yang
The thermoelectric performance of n-type Bi2Te3 needs further enhancement to match that of its p-type Bi2Te3 counterpart and should be considered for competitive applications. Combining Cu/Cl and multiscale additives (AgBiSe2) presents a suitable route for such enhancement. This is evidence of the enhanced thermoelectric performance of Bi1.995Cu0.005Te2.69Se0.33Cl0.03. Moreover, by incorporating 0.65 wt % AgBiSe2 (ABS) into Bi1.995Cu0.005Te2.69Se0.33Cl0.03, we further reduce its lattice thermal conductivity to ∼0.28 W m–1 K–1 at 353 K owing to the extra phonon scattering of multiscale ABS. Additionally, the Seebeck coefficient enhances (−183.89 μV K–1 at 353 K) owing to the matrix’s reduced carrier concentration caused by ABS. As a result, we achieve a high ZT of ∼1.25 (at 353 K) and a high ZTave of ∼1.12 at 300–433 K for Bi1.995Cu0.005Te2.69Se0.33Cl0.03 + 0.65 wt % ABS. This work provides a promising strategy for enhancing the thermoelectric performance of n-type Bi2Te3 through Cu/Cl doping and ABS incorporation.
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高影响因子
Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-20
·
IF 26.6
He Hualing,Qin Yi,Zhu Zhenyu,Jiang Qing,Ouyang Shengnan,Wan Yuhang,Qu Xueru,Xu Jie,Yu Zhicai
The p – n segment thermoelectric aerogel fiber was fabricated through an alternating coaxial wet-spinning strategy.
Resultant alternating p – n segment thermoelectric fiber was electrically connected in series (two p – n pairs with a length of 3 cm) with an outstanding electrical conductivity of 23.76 S m −1 .
Thermoelectric textile-based self-powered fire warning electronics exhibited sensitivity (trigger time within 1.43 s) and repeatable temperature sensing performance for firefighting clothing.
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高影响因子
Environmental Science-Nano
·
2023
·Vol. 10
·期 11
·3072-3083
·
IF 7.3
Chuanqi Pan,Biluan Zhang,Tingyu Pan,Hui Huang,Siyi Song,Xitong Cai,Yuhang Wang,Hongwei Sun,Zhu Luo,Lizhi Zhang,Yanbing Guo
The dual activation mechanism of molecular oxygen (O2) and water (H2O) in the local structure of catalysts has not been elucidated yet. Herein, we report a strategy for manufacturing fully exposed Ag4 sites in nano silver/graphdiyne (Ag/GDY) composites for activating O2 and H2O. The synthesized nano Ag was uniformly anchored on the surface of GDY without any surfactant added, with an average particle size of 2.5 nm. The unique sp-hybrid C and triangular pore structure of GDY not only regulate the stable geometric structure of nano Ag, but also enhance the adsorption ability of Ag4 sites for O2 and H2O molecules in nano Ag/GDY. Electron spin resonance spectroscopy and density functional theory calculation results proved that O2 is more favorable to synergistically promote the activation of H2O to generate reactive ·O2− and ·OH radicals on the nano Ag/GDY surfaces, leading to outstanding antibacterial activity. This work provides a simple strategy for the preparation of stable nano Ag and proposes to improve the catalytic oxidation activity by adjusting the local electronic structure of catalysts to activate O2 and H2O.
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高影响因子
Nano Energy
·
2023
·
IF 17.6
Ya Cheng,Jing Wang,Xiaofeng Lu,Ce Wang
Due to the increased demand for health monitoring and disease alarm, the self-powered epidermal electric sensors have attracted extensive attention, such as triboelectric nanogenerator (TENG)-based electric skin (e-skin). However, the humidity accumulation at the interface between e-skin and skin will threaten the stability and reliability of the monitoring signals. Moisture absorptivity and perspiration are still great challenges that need to be addressed. Here, inspired by the internal structure of plants used to transport water, we fabricated an all-nanofiber Janus textile via a continuous electrospinning/electrospray technology, presenting a double gradient variations in the pore size and wettability along the thickness direction. Janus textile was constructed from the hydrolyzed polyacrylonitrile (HPAN)/hexagonal boron nitride nanosheets (BNNS) fibrous membrane with small pores and hydrophilicity , conducting Ag nanowire (NW)layer, and polyurethane (TPU) nanofibrous membrane with large pores and hydrophobicity . By utilizing the wicking effect of external HPAN/BNNS layer, the sweat droplet could be transported from the interface between the skin and Janus textile to the external environment, meanwhile, the returned sweat will be blocked by interior TPU layer to keep the dry state of the skin. Therefore, the directional moisture transportation was realized. As the near-skin side, TPU was used as the other triboelectric layer, the optimal triboelectrification output reached 78.10 V, 0.16 μA, and 3.31 W m −2 . Moreover, the damped Janus textile also exhibited an open-circuit voltage of 30 V, a short-circuit current of 0.051 μA, and a power density of 0.14 W m −2 . With the assistance of an adhesive layer , Janus textile e-skin could easily adhere to the skin surface, generating stable movement and physiological sensing signals. In short, this work presents a noval way to construct Janus e-skin patch with directional sweating and breathability for monitoring long-term real-physiological signals.
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高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Qi Han,Yan Li,Xiaopeng Lu,Di Mei,Qianqian Chen,Tao Zhang,Fuhui Wang
Antibacterial plasma electrolytic oxidation (PEO) coatings have been fabricated by in-situ incorporation of Ag particles on pure Mg. It was found that the Ag particles have been partly oxidized and incorporated into the layer during coating formation process. Ag containing PEO coatings can strongly inhibit the growth of S. aureus and the antibacterial efficiency of the coatings is mainly associated with the Ag concentration in the layer. The antibacterial rate of the coating reaches 99% and is maintained to be stable when sufficient Ag particles (above 1 wt%) are incorporated into the layer.
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高影响因子
危险品化学品经营许可证（带存储）