IONICS
·
2021
·Vol. 27
·期 4
·1385-1392
·
IF 2.817
Chen Zhi,Xiang Tong,Xiong Qingming,Chen Li,Yang Huiyong,Feng Zhijun,Li Xibao,Shen Xing,Huang Juntong
SiO 2 -based anodes for lithium ion batteries (LIBs) suffer from low conductivity and volume change in charge/discharge processes. It is reported that reasonable amorphous and nanometric characteristics can effectively improve the activity of SiO 2 for Li + storage. So, highly active SiO 2 @C nanofibers were prepared by electrospinning. Using X-ray diffraction (XRD), its amorphous characteristics were revealed. The results from scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that it was a nanofiber structure. As an anode for LIBs, the SiO 2 @C nanofibrous electrode showed the discharge capacities of 675 and 188 mAh g −1 at 1 A g −1 (1000the cycle) and 10 A g −1 (5000th cycle), respectively. Even at 50 A g −1 , it still maintained 88 mA h g −1 at 60,000 cycles, showing excellent stability and high rate.
✓ 已验证
产品关联
DOI
高影响因子
HEAT AND MASS TRANSFER
·
2021
·
IF 2.464
Liu Changhui,Jiang Pan,Huo Yixuan,Zhang Tianjian,Rao Zhonghao
With the continuing development in the electric industry, highly efficient heat dissipation is of great significance due to the shrinkage of electric elements and increase in energy input. Working fluid, acting as a heat transfer medium, plays a core role in the thermal management. While, traditionally used working fluids suffer from either low thermal conductivity or relatively narrow liquid range that are unable to meet the growing demands for highly efficient thermal management. In this work, a silica decorated graphene (SDG) was fabricated using a sol-gel method and dispersed in a deep eutectic solvent (DES) system with the aim at addressing the poor thermal conductivity, stability and narrow working temperature range simultaneously. It is verified that the stability of nanofluids can be significantly improved since it could be kept for one week without obvious precipitation and aggregation due to the presence of silica coating on the layer of graphene. On the other hand, an 11.26% thermal conductivity enhancement was obtained by filling only 3.0 wt. % of the SDG. Moreover, viscosity study reveals that the presence of SDG has a slight influence on the rheological property of the nanofluids.
✓ 已验证
DOI
高影响因子
Nano Research
·
2020
·Vol. 14
·期 8
·2574-2583
·
IF 8.183
Zhao Xiaojuan,Wan Houzhao,Liang Pei,Wang Nengze,Wang Cong,Gan Yi,Chen Xu,Tan Qiuyang,Liu Xiang,Zhang Jun,Wang Yi,Wang Hanbin,Wang Hao
High-rate battery-type cathode materials have attracted wide attention for advanced battery-supercapacitor hybrid (BSH) devices. Herein, a core-shell structure of the hollow mesoporous carbon spheres (HMCS) supported NiSe 2 nanosheets (HMCS/NiSe 2 ) is constructed through two-step reactions. The HMCS/NiSe 2 shows a max specific capacity of 1,153.5 C·g −1 at the current density of 1 A·g −1 , and can remain at 774.5 C·g −1 even at 40 A·g −1 (the retention rate as high as 67.1%) and then the HMCS/NiSe 2 electrode can keep 80.5% specific capacity after 5,000 cycles at a current density of 10 A·g −1 . Moreover, the density functional theory (DFT) calculation confirmed that the introduction HMCS into NiSe 2 made adsorption/desorption of OH − easier, which can achieve higher rate capability. The HMCS/NiSe 2 //6 M KOH//HMCS hybrid device has energy density of 47.15 Wh·kg −1 and power density of 801.8 W·kg −1 . This work provides a feasible electrode material with a high rate and its preparation method for high energy density and power density energy storage devices.
✓ 已验证
产品关联
DOI
高影响因子
Microsystems & Nanoengineering
·
2020
·Vol. 6
·期 1
·1-10
·
IF 5.048
Lu Qifeng,Sun Fuqin,Liu Lin,Li Lianhui,Wang Yingyi,Hao Mingming,Wang Zihao,Wang Shuqi,Zhang Ting
The memristor has been regarded as a promising candidate for constructing a neuromorphic computing platform that is capable of confronting the bottleneck of the traditional von Neumann architecture. Here, inspired by the working mechanism of the G-protein-linked receptor of biological cells, a novel double-layer memristive device with reduced graphene oxide (rGO) nanosheets covered by chitosan (an ionic conductive polymer) as the channel material is constructed. The protons in chitosan and the functional groups in rGO nanosheets imitate the functions of the ligands and receptors of biological cells, respectively. Smooth changes in the response current depending on the historical applied voltages are observed, offering a promising pathway toward biorealistic synaptic emulation. The memristive behavior is mainly a result of the interaction between protons provided by chitosan and the defects and functional groups in the rGO nanosheets. The channel current is due to the hopping of protons through functional groups and is limited by the traps in the rGO nanosheets. The transition from short-term to long-term potentiation is achieved, and learning-forgetting behaviors of the memristor mimicking those of the human brain are demonstrated. Overall, the bioinspired memristor-type artificial synaptic device shows great potential in neuromorphic networks.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
·
IF 12.264
Zhang Songtao,Jin Longhai,Liu Jianhua,Liu Yang,Zhang Tianqi,Zhao Ying,Yin Na,Niu Rui,Li Xiaoqing,Xue Dongzhi,Song Shuyan,Wang Yinghui,Zhang Hongjie
The MoS 2 nanosheets served as co-catalyst could reduce Fe 3+ ions with lower Fenton reaction activity into the highly reactive Fe 2+ ions, thereby boosting the production of hydroxyl radical (•OH) for high efficiency chemodynamic therapy (CDT).
The photothermal effect of MoS 2 nanosheets motivated by second near-infrared light could further improve the treatment effectiveness by synergetic photothermal-enhanced CDT and photothermal therapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 4
·1-8
·
IF 6.232
Zhang Qiao,Zhang Fengxia,Yu Lei,Kang Qi,Chen Yuqin,Shen Dazhong
A differential photoelectrochemical (PEC) method for glucose determination is reported using a nanocomposite with double mimic enzymes of glucose oxidase (GOx) and peroxidase. The nanocomposite was prepared by soaking zeolite imidazole framework-67 (ZIF-67) in 0.1 M NaOH solution at room temperature for 30 min, abbreviated as Co x O y H z @ZIF-67. The Michaelis–Menten constant of Co x O y H z @ZIF-67 to H 2 O 2 and glucose is 121 μM and 3.95 mM, respectively. Using the photoelectrode of Co x O y H z @ZIF-67/TiO 2 nanotubes (NTs), glucose was oxidized firstly by dissolved oxygen to generate H 2 O 2 under the catalysis of Co x O y H z film as the mimics of GOx. The product of H 2 O 2 enhanced the photocurrent of TiO 2 NTs under the catalysis of ZIF-67 as the mimics of peroxidase. The molecular sieve effect of ZIF-67 frameworks reduces the interferences from molecules with size larger than the apertures in ZIF-67. Under the excitation of a 150 W xenon lamp with full spectrum, the photocurrent was measured in a two-electrode system without external additional potential. By using the photocurrent difference between two photocells, i.e Co x O y H z @ZIF-67/TiO 2 NTs and Pt electrode, ZIF-67/TiO 2 NTs and Pt electrode, as the signal, the selectivity for glucose determination is improved further. The differential PEC method was applied to the determination of glucose with a linear range 0.1 μM~1 mM and a detection limit of 0.03 μM.
Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 14
·期 6
·1087-1099
·
IF 3.552
Zhang Weihong,Wang Dan,Wang Jie-Xin,Pu Yuan,Chen Jian-Feng
In this work, we developed a continuous preparation strategy for the production of high-solidscontent waterborne polyurethane (WPU) emulsions via high-gravity-assisted emulsification in a rotating packed bed (RPB) reactor. By adjusting the experimental parameters and formula, WPU emulsions with a high solids content of 55% and a low viscosity were prepared. Preliminary applications of the high-solids-content WPU as a thermally insulating material were demonstrated. RPB emulsification is an economical and environmentally friendly production strategy because of the low energy consumption, short emulsification time, and effective devolatilization. This study demonstrated an effective method for preparation of high-solids-content WPU, moving toward commercialization and industrialization.
✓ 已验证
产品关联
DOI
高影响因子
Pharmacological Reports
·
2020
·Vol. 72
·期 2
·400-417
·
IF 2.754
Li Yingxue,Jiang Bo,Wang Ruiyin,Wang Jingyun,Li Yachen,Bao Yongming
Background Tanshinone IIA (Tan IIA) and andrographolide (Andro) are natural compounds that are reported to exhibit anticancer activities against various types of cancers. The aim of this study is to evaluate the synergistic anticancer effects of the combination of Tan IIA and Andro, and to investigate the mechanisms of pharmacological effect and their potential applications as an anticancer therapy in clinics.
Methods The anticancer effects of the combination of Tan IIA and Andro on MCF7, SMMC7721, and BGC823 cells were explored. The apoptosis of the cancer cells was determined by MTT and AV-PI dual stain assays. The intracellular GSH level was measured by DTNB assay, and the intracellular levels of reactive oxygen species (ROS) were examined by flow cytometry. The expression of the proteins in the apoptosis pathway was determined by immunobloting. Results The combination of Tan IIA and Andro exhibited significant synergistic anticancer effects against cancer cells, especially at low concentrations. Andro reacted with the thiol group of intracellular GSH, thus disrupting the GSH redox cycle and eventually increasing the level of intracellular ROS. Tan IIA triggered p53 responses and apoptosis by binding to the DNA of cancer cells. The crosstalk between ROS and p53 exhibited a synergistic effect on the apoptosis of cancer cells. Conclusion The combination of Tan IIA and Andro showed significant synergistic effects on cancer cell apoptosis by promoting crosstalk between ROS and p53, providing a novel and effective combination that has the potential to be applied in clinical anticancer therapy. Graphic abstract
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 3
·1-10
·
IF 2.426
Liang Kuan,Zhao Jingbo,Zhang Ganggang,Zhang Zhiyuan,Shi Ling,Zhang Junying
A simple method is established to synthesize bio-based cross-linked polyitaconamides (cPITAs) through a Michael ene-amine addition and bulk polycondensation. A tetraester, i.e. tetramethyl piperazine-N,N′-bis(2-methylene butanedioate) (TMPB), was synthesized through a Michael addition of dimethyl itaconate and piperazine at 90 °C. Bulk polycondensation of TMPB with butanediamine or hexamethylenediamine was conducted at 130–170 °C under atmospheric pressure, and several cPITAs with tunable properties were prepared. The Michael addition and the polycondensation were monitored by FT-IR and 1 H NMR spectra. The cPITA films were characterized by DSC, WAXS, TGA, dynamic mechanical analysis, and tensile test. cPITAs exhibited T g ranging from 58 to 72 °C, tensile strength up to 85 MPa, and strain at break from 9% to 17%.
✓ 已验证
产品关联
DOI
高影响因子
MOLECULAR BIOTECHNOLOGY
·
2020
·Vol. 62
·期 3
·192-199
·
IF 2.022
Wang Zhen,Hu Jinhua,Yu Jiakang,Chen Daquan
The purpose of this study was to construct a biomimetic urethral repair substitute. The nano-Laponite/polylactic acid–glycolic acid copolymer (PLGA) fiber scaffolds were produced to replicate the natural human urethra tissue microenvironment. PLGA (molar ratio 50:50) and Laponite were used in this study as raw materials. The nano-Laponite/PLGA scaffolds were fabricated via electrospinning technology. After preparing the material, the microstructural and mechanical properties of the nano-Laponite/PLGA scaffold were tested via scanning electron microscopy and electronic universal testing. The effects of different amounts of Laponite on the degradation of the nano-Laponite/PLGA scaffold were studied. Human umbilical vein endothelial cells (HUVECs) were co-cultured with PLGA and nano-Laponite/PLGA scaffolds for 24, 48, or 72 h. Scanning electron microscopy results illustrated that the microstructure of the scaffold fabricated by electrospinning was similar to that of the natural extracellular matrix. When the electrospinning liquid contained 10% Laponite, the nano-Laponite/PLGA stress–strain curve illustrated that the scaffold has strong elastic deformation ability. HUVECs exhibited good growth on the nano-Laponite/PLGA scaffold. When the scaffold contained 1% Laponite, the cell proliferation rate in the CCK-8 test was significantly better than that for the other three materials, displaying good cell culture characteristics. The 1% nano-Laponite/PLGA composite scaffold can be used as a suitable urethral repair material, but its performance requires further development and research.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2020
·Vol. 26
·期 4
·1617-1627
·
IF 2.394
Ren Xiaoying,Du Junlin,Pu Zhaohui,Wang Runbo,Gan Liao,Wu Zhu
High-temperature lithium battery system operated between 150 and 300 °C is highly desirable to be applied in oil/gas and geothermal explorations. However, the development of cathode material for high-temperature lithium batteries is relatively sluggish. In this study, LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM) is coated with Li 2 MoO 4 by a facile solid-state reaction between MoO 3 and surface lithium residue and the resulting composite is applied in high-temperature lithium batteries as a novel cathode material. Such a strategy can not only remove lithium residue components, but also facilitate lithium-ion transport in NCM through the resulting Li 2 MoO 4 coating layer. At 200 °C, the discharge capacity and rate capacity of Li 2 MoO 4 coated NCM are dramatically improved compared to the pristine one. At 300 °C, the electrochemical performance of 4m-NCM is better than other samples, and each sample exhibits better electrochemical performances than it is at 200 °C due to the enhanced kinetics in high temperature.
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-10
·
IF 12.121
Wang Xiuyun,Peng Xuanbei,Chen Wei,Liu Guangyong,Zheng Anmin,Zheng Lirong,Ni Jun,Au Chak-tong,Jiang Lilong
The industrial synthesis of ammonia (NH 3 ) using iron-based Haber-Bosch catalyst requires harsh reaction conditions. Developing advanced catalysts that perform well at mild conditions (<400 °C, <2 MPa) for industrial application is a long-term goal. Here we report a Co-N-C catalyst with high NH 3 synthesis rate that simultaneously exhibits dynamic and steady-state active sites. Our studies demonstrate that the atomically dispersed cobalt weakly coordinated with pyridine N reacts with surface H 2 to produce NH 3 via a chemical looping pathway. Pyrrolic N serves as an anchor to stabilize the single cobalt atom in the form of Co 1 -N 3.5 that facilitates N 2 adsorption and step-by-step hydrogenation of N 2 to *HNNH, *NH-NH 3 and *NH 2 -NH 4 . Finally, NH 3 is facilely generated via the breaking of the *NH 2 -NH 4 bond. With the co-existence of dynamic and steady-state single atom active sites, the Co-N-C catalyst circumvents the bottleneck of N 2 dissociation, making the synthesis of NH 3 at mild conditions possible.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）