NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 14
·5287-5296
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IF 3.069
Xueshan Jing,Zhiguang Guo
Fabricating conductive materials based on sponges is applicable to many fields due to their outstanding performance. However, superhydrophobic conductive sponges are not only easily damaged by water but also have a complicated production process, which severely limit their working conditions and large-scale preparation. In this work, conductive sponges involving multiple superior characteristics of superhydrophobicity, excellent electrical conductivity, thermo-stability, and mechanical and chemical durability are fabricated based on WS2 nanosheets and modified Ag nanoparticles (M-AgNPs) via a one-step method. More importantly, when immersed in water, the resistance of the WS2&M-AgNPs superhydrophobic conductive sponge remained unchanged which is beneficial for adaptations in working conditions. In addition, in order to ensure the normal use of various sensors in the natural environment, WS2&M-AgNPs conductive sponges possessed the important ability of thermo-stability and the resistance had little change in the temperature range 0 °C to 40 °C. Even after suffering 2400 compressions, the superhydrophobic sponges recovered their original shape and retained outstanding hydrophobicity, which highly prolonged the lifetime of the pedometer. The conductive sponges retained excellent hydrophobicity in the pH range 1 to 14. It was noted that the superhydrophobic conductive sponges showed a linear relationship between resistance and compressed distance. According to this linear relation, a pressure sensor fabricated using this sponge can measure multiple parameters such as weight and depth of water. Herein, a simple preparation method is provided to fabricate superhydrophobic conductive sponges, which expands the working conditions and may be a breakthrough for traditional sensor preparation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 1
·759-773
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IF 2.599
Liu Ping,Chang Xing,Lin Jingjing,Yan Song,Yao Lu,Lian Jun,Lin Hualin,Han Sheng
Poly( m -phenylenediamine)-coated hexagonal Co 9 S 8 was firstly synthesized by the polymerization with self-prepared hexagonal Co(OH) 2 used as cobalt source, and the calcination with sulfur powder providing sulfur source. By adjusting the concentration of m -phenylenediamine in the polymerization process, the coating was achieved with the different coated results, further affecting their supercapacitor behaviors by improving diffusion path for fast electron transfer. The resulting Co 9 S 8 /PmPD electrodes demonstrate excellent electrochemical performance with high specific capacitance of 950.1 F g −1 at a current density of 0.5 Å g −1 , good rate performance of 81.1% capacitance retention as the current density grows from 0.5 to 20 Å g −1 , and almost no capacitance loss after 1000 cycles. Moreover, as asymmetric positive electrode material, the Co 9 S 8 /PmPD-1 shows high specific capacitance of 115.3 F g −1 at 0.5 Å g −1 , outstanding rate performance of 78.2% capacitance retention even increased to 20 Å g −1 , superior cycle stability of 87.9% capacitance retention after 5000 cycles at 2 Å g −1 and largest energy density of 36.0 W h kg −1 at power density of 374.67 W kg −1 . This novel Co 9 S 8 /PmPD composite suggests a bright prospect for supercapacitor applications.
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高影响因子
POLYMER SCIENCE SERIES B
·
2021
·Vol. 63
·期 3
·239-244
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IF 1.049
Huanhuan Zhu,Niu Mingkang,Feng Zhongtai,Li Chengjie,Li Yonghao,Jiao Qingze,Wang Shanshan,Feng Caihong,Zhao Yun,Lv Yuzhen
Abstract To obtain aromatic polyamides with reduced dielectric constant, a series of aromatic polyamide copolymers derived from the reaction between m -phenylenediamine to trans -1,2-cyclohexanediamine and isophthaloyl chloride were synthesized using the low-temperature solution polymerization in the presence of 2-methylpyridine. The influence of the content of trans -1,2-cyclohexanediamine on the structure and properties of aromatic copolyamides was evaluated. With increasing the content of trans -1,2-cyclohexanediamine, the inherent viscosities of copolymers decrease from 1.95 to 1.14 dL/g. The copolymer with 25 mol % of trans -1,2-cyclohexanediamine has a reduced dielectric constant ε r of 4.61 at 1 MHz, which is 26% lower than homopolyamide. Meanwhile, as-synthesized aromatic polyamides and copolyamides show good thermal stability and mechanical properties.
研究领域:
材料科学
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高分子化学
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高影响因子
POLYMER
·
2024
·
IF 4.1
Xiang Dong,Zhiyu Sun,De-long Li,Qiancheng Duan,Yan Ma,Song Liu
As epoxy resin (EP) is widely used in the microelectronic field, it is essential to improve its electromagnetic wave (EMW) absorption and flame retardancy simultaneously. In this work, we synthesized a novel nanohybrid, RMN (Fe 3 O 4 /NHS@M(OH)(OCH 3 )@rGO (M = Co, Ni)), with petal-shaped anisotropic interfaces, by using graphene oxide as the core and the 2D nanosheets M(OH)(OCH 3 ) (M = Co, Ni) as the petal, with nickel hydroxystannate and ferrite as further modifications. The RMN combines carbon-based materials, ferrites and conductors, and represents the petal-like structure with rich nondirectional interfaces. The results show that EP composite containing 25 wt% RMN represented excellent EMW absorption, with a minimum reflection loss of −55.79 dB (with 7.4 mm thickness at 3.1 GHz). Moreover, the EP composite with 15 wt% RMN (EP/RMN700-3) had the lowest peak heat release rate of 470.9 kW m −2 , which was 69.7 % lower than pure EP, showing a significantly improving in flame retardant. The thermal conductivity efficiency of EP/RMN700-3 increased to 128.4 % compared with the pure EP, which effectively reduces fire risk caused by heat accumulation. This study provides a valuable solution to overcome the challenges of EMW absorption and flame retardant for EP in the microelectronic materials field.
研究领域:
材料科学
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电子工程
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Microbiome
·
2025
·Vol. 13
·期 1
·250
·
IF 12.7
Zhao Feng,Wang Jiao,Liang Weijuan,Sun Fanwei,Liu Zhaoyi,Wu Yuehua,Khan Ahmad,Wang Chunsong,Zhou Ruiqi,Feng Huaili,You Ting,Duan Xinhao,Zhang Hongyang,Qiu Jingfu,Chen Chengzhi
Background The contribution of dietary interventions, particularly lysine-restricted diets (LRD), to ameliorating obesity-associated anxiety-like behaviors remains elusive, with limited evidence clarifying microbiota-metabolite-brain axis pathways involved. Results Herein, our results demonstrated that LRD attenuated high-fat diet (HFD)-induced anxiety-like behaviors while concomitantly reducing body weight and improving glucose metabolism. Furthermore, LRD significantly remodeled gut microbiota composition, most notably enriching the abundance of Oscillibacter. We then screened and identified that both viable and encapsulated Oscillibacter ruminantium alleviated obesity- and chronic restraint stress-induced anxiety-like behaviors, with microencapsulated formulations conferring superior anxiolytic efficacy. Notably, the obtained data revealed that LRD reversed HFD-induced the depletion of tryptophol, which was established as the metabolite of Oscillibacter ruminantium, and LRD could also alleviate the intestinal barrier impairment caused by HFD. Mechanistic results further demonstrated that tryptophol supplementation ameliorated HFD-driven anxiety-like phenotypes by inhibiting FTO-mediated reader protein IGF2BP1, and thereby reducing m⁶A modification of Lgr6 mRNA. Conclusion LRD attenuates obesity-associated anxiety-like behaviors by enriching Oscillibacter ruminantium and modulating tryptophol production, thereby activating the FTO-IGF2BP1-LGR6 signaling axis. These findings would indicate LRD as a microbiota-directed therapeutic strategy for neurobehavioral comorbidities of metabolic stress. Graphical
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yichi Chen,Wenxin Xu,Huimin Tian,Junbin Gao,Yicheng Ye,Hanfeng Qin,Hong Wang,Yanzhen Song,Chuxiao Shao,Fei Peng,Yingfeng Tu
Light-propelled nanomotors, which can convert external light into mechanical motion, have shown considerable potential in the construction of a new generation of drug delivery systems. However, the therapeutic efficacy of light-driven nanomotors is always unsatisfactory due to the limited penetration depth of near-infrared-I (NIR-I) light and the inherent biocompatibility of the motor itself. Herein, an asymmetric nanomotor (Pd@ZIF-8/R848@M JNMs) with efficient motion capability is successfully constructed for enhanced photoimmunotherapy toward hepatocellular carcinoma. Under near-infrared-II (NIR-II) irradiation, Pd@ZIF-8/R848@M JNMs convert light energy into heat energy, exhibiting self-thermophoretic locomotion to penetrate deeper into tumor tissues to achieve photothermal therapy. At the same time, functionalized with an immune-activated agent Resiquimod (R848), our nanomotors could convert a “cold tumor” into a “hot tumor”, transforming the immunosuppressive microenvironment into an immune-activated state, thus achieving immunotherapy. Dual photoimmunotherapy of the as-developed NIR-II light-driven Pd@ZIF-8/R848@M JNMs demonstrates considerable tumor inhibition effects, offering a promising therapeutic approach in the field of anticancer therapy.
研究领域:
纳米技术
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癌症治疗
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生物医学工程
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光化学
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DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Fang Cao,Xu Chang,Zhang Wei,Zhou Meng,Tan Dong,Qian Lixia,Hu Daqiao,Jin Shan,Zhu Manzhou
Dual emission (DE) in nanoclusters (NCs) is considerably significant in the research and application of ratiometric sensing, bioimaging, and novel optoelectronic devices. Exploring the DE mechanism in open-shell NCs with doublet or quartet emissions remains challenging because synthesizing open-shell NCs is difficult due to their inherent instability. Here, we synthesize two dual-emissive M 1 Ag 13 (PFBT) 6 (TPP) 7 (M = Pt, Pd; PFBT = pentafluorobenzenethiol; TPP = triphenylphosphine) NCs with a 7-electron open-shell configuration to reveal the DE mechanism. Both NCs comprise a crown-like M 1 Ag 11 kernel with Pt or Pd in the center surrounded by five PPh 3 ligands and two Ag(SR) 3 (PPh 3 ) motifs. The combined experimental and theoretical studies revealed the origin of DE in Pt 1 Ag 13 and Pd 1 Ag 13 . Specifically, the high-energy visible emission and the low-energy near-infrared emission arise from two distinct quartet excited states: the core-shell charge transfer and core-based states, respectively. Moreover, PFBT ligands are found to play an important role in the existence of DE, as its low-lying π * levels result in energetically accessible core-shell transitions. This novel report on the dual-quartet phosphorescent emission in NCs with an open-shell electronic configuration advances insights into the origin of dual-emissive NCs and promotes their potential application in magnetoluminescence and novel optoelectronic devices.
研究领域:
纳米技术
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材料科学
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光电技术
·
化学
·
物理
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高影响因子
Science China-Materials
·
2024
·
IF 6.8
Zha Xinlin,Zuo Mengjuan,You Haining,Yan Zhong,Xiong Yi,Liu Ying,Liu Liu,Wu Yi,Liu Ke,Li Mufang,Zhao Tao,Wang Dong
Chiral conjugated polymers with controlled mesoscopic helicity are gaining attention for enantioseparation and asymmetric catalysis. However, achieving on-demand chirality and processability remain challenging. Herein, we exploit supramolecular coordination polymers formed by Mn 2+ and chiral phenylglycine derivatives (L-/D-16PhgCOOH) as templates, using m -phenylenediamine as the monomer to synthesize chiral poly( m -phenylenediamine) (PMPD). In the Mn 2+ -templated system, the PMPD’s handedness is opposite to the molecular chirality of L-/D-16PhgCOOH, while in the Mn 2+ -free system, the PMPD handedness aligns with that of the template molecule. This method allows for helicity switching of chiral polymers within a single chirality template system. The introduction of Mn 2+ is demonstrated to disrupt and reconstitute the supramolecular interactions in the co-assembly, influencing subsequent supramolecular stacking patterns. Carbonizing the resulting PMPDs directly produces chiroptical active nitrogen-doped carbonaceous nanomaterials that inherit the original helicity. Moreover, incorporating F-127 into the polymerization system enhances the aspect ratio of PMPDs, facilitating their delicate processing into chiral self-supporting two-dimensional films and three-dimensional foams. With abundant Lewis basic sites, these chiral polymers offer versatile platforms for novel chiral host-guest interactions.
研究领域:
高分子化学
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超分子化学
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材料科学
·
不对称催化
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高影响因子
Nanoscale Advances
·
2020
·Vol. 2
·期 3
·1084-1089
·
IF 0
Shuli Yin,Ziqiang Wang,Chunjie Li,Hongjie Yu,Kai Deng,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Rational design of Pt-based nanostructures with a controllable morphology and composition is vital for electrocatalysis. Herein, we demonstrate a dual-template strategy to fabricate well-defined cage-bell nanostructures including a Pt core and a mesoporous PtM (M = Co, Ni) bimetallic shell (Pt@mPtM (M = Co, Ni) CBs). Owing to their unique nanostructure and bimetallic properties, Pt@mPtM (M = Co, Ni) CBs show higher catalytic activity, better durability and stronger CO tolerance for the methanol oxidation reaction than commercial Pt/C. This work provides a general method for convenient preparation of cage-bell nanostructures with a mesoporous bimetallic shell, which have high promising potential for application in electrocatalytic fields.
研究领域:
材料科学
·
电化学
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PubMed
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Qizhao Wang,Jijuan He,Yanbiao Shi,Shuling Zhang,Tengjiao Niu,Houde She,Yingpu Bi,Ziqiang Lei
The leaf-like structure BiVO 4 electrode and MFe 2 O 4 /BiVO 4 (M = Ni, Co) composite photoelectrodes were prepared by electrochemical deposition, ensuing heating treatment and electrophoretic deposition technology. The characterizations of SEM, XRD and DRS indicated that the BiVO 4 derivatives mainly existed in small nanoparticles with monoclinic phase and exhibited stronger light absorption capability than that of pure BiVO 4 . Hereon, the respective photoelectrochemical (PEC) activities of BiVO 4 and its derived composites were systematically studied. The results suggested that the NiFe 2 O 4 /BiVO 4 and CoFe 2 O 4 /BiVO 4 not only showed higher photocurrent response values at 1.23 V vs. NHE than pure BiVO 4 electrode under visible light illumination, but also played a superior PEC hydrogen evolution performance, which was considered owing to their strong absorption to light, reduction combination of carriers and effective separation of electrons and holes.
研究领域:
材料科学
·
能源科学
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Xue-dong Wang,Ya Li,Tao-tao Dai,Xue-mei He,Ming-shun Chen,Cheng-mei Liu,Rui-hong Liang,Jun Chen
Novel pectin/poly(m-phenylenediamine) (P/PmPDA) microspheres with different content of PmPDA were prepared by assembling PmPDA on the surface of pectin microsphere. The successful preparation was confirmed by the results of Fourier Transform Infrared spectra (FTIR), scanning electron microscopy (SEM) and elemental analysis. Compared with pectin microsphere, the Pb 2+ adsorption performance of P/PmPDA microspheres was significantly improved. The results of batch adsorption experiments were in good agreement with the Langmuir isotherm model for Pb 2+ adsorption, indicating the adsorption was monolayer. The maximum adsorption capacity of Pb 2+ was found to be 390.9 mg/g. The kinetic adsorption process was well described by the pseudo-second-order model and chemical adsorption dominated the adsorption process. The potential mechanisms of Pb 2+ adsorption were speculated as ion exchange and chelation, which were supported by X-ray photoelectron spectroscopy (XPS). The P/PmPDA microspheres showed good recyclability after five adsorption/desorption cycles. All these results indicated the potential of P/PmPDA microspheres for removing Pb 2+ .
研究领域:
环境科学
·
材料科学
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高影响因子
Nanomedicine-Nanotechnology Biology and Medicine
·
2020
·
IF 5.182
Xin Huang,Chenyu Lin,Cici Luo,Yuhan Guo,Jun Li,Yiping Wang,Jiahong Xu,Yuwen Zhang,He Wang,Zhongmin Liu,Bingdi Chen
Atherosclerosis can lead to most cardiovascular diseases. Although some biomimetic nanomaterials coated by macrophage membranes have been reported in previous studies of atherosclerosis, to our knowledge, no studies regarding the detection of early lesions of atherosclerosis (foam cells) using such a strategy have yet been reported. In the present study, Fe 3 O 4 biomimetic nanoparticles coated with a macrophage membrane (Fe 3 O 4 @M) were prepared to investigate the imaging effect on the early lesions of atherosclerosis (foam cells). The results showed that the Fe 3 O 4 @M particles are spheres with average diameters of approximately 300 nm . T1 and T2 relaxation values showed that the ratio of r2 to r1 was 26.09. The protein content accounted for approximately 27% of the total weight in Fe 3 O 4 @M, and Fe 3 O 4 @M nanoparticles exhibited high biosafety. Further testing showed that Fe 3 O 4 @M effectively targets early atherosclerotic lesions by the specific recognition of integrin α4β1 to VCAM-1. Taken together, Fe 3 O 4 @M is a promising contrast agent for the diagnosis of early stage atherosclerosis.
研究领域:
纳米技术
·
医学成像
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心血管疾病
·
生物材料
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PubMed
高影响因子
危险品化学品经营许可证（带存储）