COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Yan Yang,Chengxiao Sun,Hua Deng,Qiang Fu
Dielectric capacitors with high dielectric constant and energy density are of great importance for electronic devices. Barium titanate(BaTiO 3 ) have been widely explored for polymer-based dielectric composites owning to its ultrahigh dielectric constant and commercial availability. However, due to the large difference of dielectric constant between BaTiO 3 and polymer matrix , the interface becomes fragile under electric field, which is not conducive for the improvement in breakdown strength and energy storage density . Herein, a flower like barium titanate/nickel hydroxide(BTO/Ni(OH) 2 ) core-shell structured filler has been fabricated to provide a novel approach to modify the interface between BTO and P(VDF-HFP) matrix for dielectric polymer composites . Ni(OH) 2 nanoflakes have grown in-situ on the surface of hydroxylated BaTiO 3 particles to form the flower like core-shell assemblies via hydrothermal reaction . Then, these synthetic BTO/Ni(OH) 2 particles with specific flower-like core-shell structure can be uniformly dispersed in P(VDF-HFP) without any additional surface modification due to their surface –OH groups. Meanwhile, Ni(OH) 2 shell triggered beta phase of P(VDF-HFP) near core-shell filler based on the interfacial interaction between Ni(OH) 2 and P(VDF-HFP). Thus, the intensity of the local electric field can be gradually reduced due to the formation of a dielectric constant gradient. Besides, these Ni(OH) 2 nanoflakes shell are able to cut down the local electric field and prevent the growth of electrical trees on the surface of BaTiO 3 during breakdown process. When the composite filler content is 10 wt%, the dielectric constant and breakdown strength increases to 14.8 and 330 kV/mm from 11 to 260 kV/mm, respectively. And the calculated energy density is 7.13 J/cm 3 , which is 1.5 times that of 10 wt% BTO/P(VDF-HFP) composite film . This study provides a novel shell material Ni(OH) 2 for the preparation of BTO core-shell structure filler, which has good compatibility with polymer substrates .
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NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 5
·4761-4768
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IF 3.277
Lei Li,Beibei Lu,Jianning Wu,Qikui Fan,Xuhong Guo,Zhiyong Liu
In this work, we report that well-defined amphiphilic star-shaped polyhedral oligomeric silsesquioxane (POSS)-based inorganic/organic hybrid block copolymers of poly(ε-caprolactone)–poly(2-(2-methoxyethoxy)ethyl methacrylate)-co-poly(ethylene glycol) methacrylate (POSS–(PCL–P(MEO2MA-co-PEGMA))16) were synthesized via click chemistry, ring opening polymerization (ROP) and atom transfer radical polymerization (ATRP), and their synthesis was confirmed by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (1H NMR), gel permeation chromatography (GPC) and X-ray photoelectron spectroscopy (XPS). The obtained polymers could self-assemble into ellipsoidal aggregates with a moderately uniform size, owing to the amphiphilic properties of the hydrophobic inorganic POSS and PCL cores and the hydrophilic P(MEO2MA-co-PEGMA) segments. These thermo-responsive organic/inorganic hybrid polymeric micelles exhibited critical phase transition temperatures in water, which could be finely tuned by changing the feed ratios of PEGMA and MEO2MA. The lower critical solution temperature (LCST) of star-shaped POSS–(PCL–P(MEO2MA-co-PEGMA))16 increased from 34 to 57 °C with the increase of PEGMA content. The results were investigated by ultraviolet-visible (UV-vis) spectroscopy, dynamic light scattering (DLS), and transmission electron microscopy (TEM). When the temperature was higher than the corresponding LCSTs, the micelles started to associate and form spherical nanoparticles. Therefore, POSS–(PCL–P(MEO2MA-co-PEGMA))16 block copolymers, a class of novel organic/inorganic hybrid materials with advantageous properties, are amphiphilic hybrid polymers with potential applications as nano-carriers, nano-reactors, and smart materials and in the biomedical field.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yiling He,Jingcheng Wu,Xianmin Gong,Peichuan Mo,Tianmi Zhang,Quangang Chen,Yi He
Graphene oxide (GO)-based membranes have been widely used in the field of wastewater treatment by virtue of their unique separation mechanism, but their practical applications are severely constrained by the problems of selectivity, permeability and membrane contamination. In this study, a novel nanofiltration membrane structure was innovatively designed using a dual strategy of cross-linking and intercalation, with a view to enhancing the membrane separation performance and service life. Modification of GO nanosheets with PEI molecules (polyethyleneimine) at room temperature improved the hydrophilicity of the nanosheets and resulted in a hydrophilic membrane surface and smooth interlayer channels. A novel flower-like type 2 %SnS 2 /Bi 2 WO 6 p-n heterojunction synthesized via hydrothermal and ultrasonic-thermal treatment techniques was embedded in a composite membrane, and the M2 membrane with the best performance was prepared (2 %SnS 2 /Bi 2 WO 6 : PEI@GO = 0.6: 1). The M2 membrane has 12 times (120.9 L m −2 h −1 ) the pure water flux of the GO membrane and retains more than 99 % of the MB molecules. Owing to the stabilization of the membrane structure by chemical crosslinking, after up to 130 h of cycling experiments (photocatalytic cleaning of the membrane surface was performed every 10 h.), the rejection rate of MB was still higher than 98 %. Therefore, for the preparation of high-performance GO-based membranes, this synergistic strategy provides a simple and effective method.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 7
·1-12
·
IF 5.3
Zhou Peipei,Hong Yangluchen,Fan Ru,Wang Huili,Wang Xuedong,Mei He
To realize the reutilization of waste Myrica rubra in the analytical field, we synthesized Myrica rubra –based N-doped carbon dots (MN-CDs) and further anchored them onto the surface of Fe 3 S 4 to fabricate Fe 3 S 4 @MN-CD nanocomposites. The as-fabricated nanocomposites possessed higher peroxidase-mimetic activity than its two precursors, resulting from the synergistic effect between them, and could catalyze colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into deep blue oxTMB with a strong 652-nm absorption. Under optimized conditions (initial solution pH, 3.5; incubation temperature, 35 ℃; Fe 3 S 4 @MN-CD concentration, 50 µg mL −1 , and 652-nm absorption), Fe 3 S 4 @MN-CDs were employed for colorimetric assay of p -aminophenol ( p -AP) with wide linear range (LR, 2.9–100 µM), low detection limit (LOD, 0.87 µM), and satisfactory recoveries (86.3–105%) in environmental waters. Encouragingly, this colorimetric assay provided the relative accuracy of 97.0–99.4% as compared with conventional HPLC-UV detection. A portable smartphone-based colorimetric application was developed by combining the Fe 3 S 4 @MN-CD-based visually chromogenic reaction with a “Thing Identify” APP software. Besides, we engineered an image-capturing device feasible for field use, in which the internal-compact sealing prevented external light source from entering photography chamber, thereby reducing light interference, and also the bottom light source enhanced the intensity of blue imaging. This colorimetric platform exhibited satisfactory LR (1–500 µM), low LOD (0.3 µM), and fortification recoveries (86.6–99.6%). In the chromogenic reaction catalyzed by Fe 3 S 4 @MN-CDs, ·O 2 − played a key role in concomitant with the participation of •OH and h + . Both the colorimetric assay and smartphone-based intelligent sensing show great promising in on-site monitoring of p -AP under field conditions. Graphical Abstract
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Yahui Gao,Gendi Song,Yanjie Xu,Yuyu Sun,Yong Feng,Huijun Tan,Wenjie Tian
By enhancing surface interaction between metal oxide particles and carbon-based materials,it can effectively improve Faraday capacitance and conductivity, ultimately achieving high energy density with sufficient redox reactions in supercapacitors. Through a gentle biomineralization process and subsequent thermal reduction strategy, we successfully prepared the graphene oxide (GO) wrapping mixed-valence manganese oxides (MnO x ) and S, P self-codoped carbon matrix porous composite (MnOx@SPC@reduced graphene oxide (RGO)).During the biomineralization process of engineered Pseudomonas sp. (M1) cells, GO nanosheets functioned as the ‘soil’ to adsorb Mn 2+ ion and uniformly disperse biogenic Mn oxides (BMO). After undergoing annealing, the MnOx nanoparticles were evenly wrapped with graphene, resulting in the creation of the MnO x @SPC@RGO3 composite. This composite possesses strong C—O—Mn bond interfaces, numerous electroactive sites, and a uniform pore structure. By optimizing the synergistic interaction between the highly conductive graphene and the remarkable surface capacitance of MnO x , the MnO x @SPC@RGO3 electrode, with its intercalation Faraday reactions mechanism of Mn 2+ ↔ Mn 3+ and Mn 3+ ↔ Mn 4+ transformations, exhibits an outstanding specific capacity (448.3 F g −1 at 0.5 A g −1 ), multiplying performance (340.5 F g −1 at 10 A g −1 ), and cycling stability (93.8% retention after 5000 cycles).Moreover, the asymmetric all-solid-state supercapacitors of MnO x @SPC@RGO3//PC exhibit an exceptional energy density of 64.8 W·h kg −1 and power density of 350 W kg −1 , as well as a long lifespan with capacitance retention of 92.5 % after 10000 cycles. In conclusion, the synthetic route utilizing biomineralization and thermal reduction exhibits significant potential for exploiting high-performance electrode materials in all-solid-state supercapacitor applications.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2011
·
IF 2.205
Yao Dai,Xiujuan Feng,Bin Wang,Ren He,Ming Bao
Air-stable P , N -bidentate ligands L1 – L7 with cyclic secondary amine moieties linked to the benzene rings of triphenylphosphine were designed and prepared. The chelating coordination mode of the P , N -bidentate ligands to the Pd(II) center was confirmed by determining the X-ray structures of the Pd(II) complexes C1 and C2 derived from ligands L1 and L2 , respectively. The ligands were used for the selective synthesis of δ -lactone through the palladium (Pd)-catalyzed telomerization of 1,3-butadiene with carbon dioxide. The highest yield (60% with 79% selectivity) was observed using the Pd 2 (dba) 3 /4-(2-(diphenylphosphino)phenyl)morpholine ( L2 ) catalyst system.
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ANALYTICAL LETTERS
·
2025
·
IF 1.8
Qinqin Sun,Jing Wang,Zhengzheng Liu,Lujie Wang,Jun Zhang,Biaowei Liu,Liqiong Huang,Fei Yan,Jinsong Liu
Convenient and sensitive detection of hydroquinone (HQ) and catechol (CC) in environmental samples holds great importance for monitoring. Herein, a vertically-ordered mesoporous silica film (VMSF) supported on the electrochemically pretreated glassy carbon electrode (p-GCE) is prepared by a simple and environmentally friendly electrochemical method and employed to construct a sensitive and anti-fouling sensing interface for quantitative detection of HQ and CC. In virtue of a simple electrochemical polarization, the p-GCE shows enhanced electroactive area and promoted electrochemical activity, as well as oxygen-containing groups, rendering a sensitive electrode substrate with improved analytical performance and the functional interface for stable growth of VMSF. The obtained VMSF/p-GCE has superior electroanalytical capacity toward HQ and CC due to the synergistic effect of hydrogen bonding of VMSF and the sensitive p-GCE electrode substrate. The developed VMSF/p-GCE sensor enables the determination of HQ and CC with a wide linear range (1 ∼ 120 μM), high sensitivity (0.368 μA/μM for HQ and 0.404 μA/μM) and low limit of detection (268 nM for HQ and 80 nM for CC). Furthermore, the capacity of the prepared VMSF/p-GCE in the analysis of HQ and CC in environmental water samples and soil leaching solutions has been studied, showing acceptable results and therefore offering a simple and low-cost way for environmental analysis.
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PLoS One
·
2013
·Vol. 8
·期 8
·e71071
·
IF 3.73
Bo-xin Zhao,Ya-bin Sun,Sheng-qi Wang,Lian Duan,Qi-lu Huo,Fei Ren,Guo-feng Li
The expression and function of P-glycoprotein (P-gp) is associated with the phenotype of multi-drug resistance (MDR), leading chemotherapy failure of patients suffered with cancer. Grape seed procyanidin(GSP) is a natural polyphenol supplement with anti-inflammatory effect. Present study assessed a new use of GSP on the MDR reversal activity and its possible molecular mechanisms in MDR1-overpressing paclitaxel resistant ovarian cancer cells. Our results showed GSP significantly enhanced the cytotoxicity of paclitaxel and adriamycin in paclitaxel resistant A2780/T cells but its parental A2780 cells. Furthermore, GSP strongly inhibited P-gp expression by blocking MDR1 gene transcription, as well as, increased the intracellular accumulation of the P-gp substrate rhodamine-123 in A2780/T cells. Nuclear factor-κB(NF-κB) activity, IκB degradation level and NF-κB/p65 nuclear translocation induced by lipopolysaccharide (LPS) and receptor activator for nuclear factor-κB ligand (RANKL) were markedly inhibited by pre-treatment with GSP. Meanwhile, GSP inhibited MAPK/ERK pathway by decreasing the phosphorylation of ERK1/2, resulting in reduced the Y-box binding protein 1 (YB-1) activation with blocking its nuclear translocation. Moreover, the up-regulation of P-gp expression, the activation of AKT/NF-κB and MAPK/ERK pathway induced by LPS was attenuated by GSP administration. Compared with PDTC and U1026, inhibitor of NF-κB and MAPK/ERK respectively, GSP showed the same tendency of down-regulating NF-κB and MAPK/ERK mediated YB-1 activities. Thus, GSP reverses P-gp associated MDR by inhibiting the function and expression of P-gp through down-regulation of NF-κB activity and MAPK/ERK pathway mediated YB-1 nuclear translocation, offering insight into the mechanism of reversing MDR by natural polyphenol supplement compounds. GSP could be a new potential MDR reversal agent used for combination therapy with chemotherapeutics in clinic.
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高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Worku Lakew Kebede,Dong-Hau Kuo,Kedir Ebrahim Ahmed,Hairus Abdullah
Pollution of water by synthetic dyes is of great concern because of the large production and usage of dyestuffs throughout the world. For dye elimination purpose, the p-n heterojunction Sb-doped MW- x composite catalysts prepared with different Mo:W precursor molar contents were synthesized via one-pot hydrothermal method. The selection in metal precursors is intended to design a composite catalyst with multiple valency in each phase. The structural, morphological, electrochemical property, and optical band gap of the composite catalyst were studied. The catalytic performance of Sb-MW composite catalysts was studied for the degradation of MB without light irradiation. It was observed that Sb-MW-4 showed superior catalytic performance to completely degrade 20 ppm MB dye solution with 20 mg catalyst in 14 min under dark condition. The composite catalyst was composed of n-(Mo,W)(O,S) 2 oxysulfide in a disordered MoS 2 framework and p-(W,Mo)(S,O) 3 sulfo-oxide in a WO 3 structure or was abbreviatedly named as n-MoS 2 /p-WO 3 based catalyst. The degradation reaction for MB dye had an apparent rate constant of 3.5 × 10 −1 min −1 . This catalyst also showed excellent stability and reusability for degrading MB dye pollutant. The degradation mechanism under dark condition is proposed.
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RSC Advances
·
2020
·Vol. 10
·期 33
·19169-19177
·
IF 3.119
Biao Zhou,Bo Yang,Muhammad Waqas,Ke Xiao,Caizhen Zhu,Ling Wu
Constructing a 0D/3D p–n heterojunction is a feasible strategy for accelerating photo-induced charge separation and promoting photocatalytic H2 production. In this study, a 0D/3D MoS2/g-C3N4 (0D/3D-MCN) photocatalyst with a p–n heterojunction was prepared via a facile light-assisted deposition procedure, and the 3D spongy-like g-C3N4 (3D-CN) was synthesized through simple thermolysis of NH4Cl and melamine mixture. For comparison, 2D-MoS2 nanosheets were also embedded in 3D-CN by a solution impregnation method to synthesize a 2D/3D-MCN photocatalyst. As a result, the as-prepared 0D/3D-MCN-3.5% composite containing 3.5 wt% 0D-MoS2 QDs exhibited the highest photocatalytic H2 evolution rate of 817.1 μmol h−1 g−1, which was 1.9 and 19.4 times higher than that of 2D/3D-MCN-5% (containing 5 wt% 2D-MoS2 nanosheets) and 3D-CN, respectively. The results of XPS and electrochemical tests confirmed that a p–n heterojunction was formed in the 0D/3D-MCN-3.5% composite, which could accelerate the electron and hole movement in the opposite direction and retard their recombination; however, it was not found in 2D/3D-MCN-5%. This study revealed the relationship among the morphologies of MoS2 using g-C3N4 as a substrate, the formation of a p–n heterojunction, and the H2 evolution activity; and provided further insights into fabricating a 3D g-C3N4-based photocatalyst with a p–n heterojunction for photocatalytic H2 evolution.
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高影响因子
TALANTA
·
2022
·
IF 6.556
Xin-Miao Bu,Wu-Duo Zhao,Man-Yu Zhang,De-Qiao Wu,Jian-Yuan Wu,Xia Xu,Di Chen
The illegally adulteration of traditional Chinese medicine with androgenic steroids exposes consumers to multiple health risks. Therefore, it is very important to establish an accurate detection method. The current study presents a stable isotope labeling matrix-assisted laser desorption/ionization high-resolution mass spectrometry (SIL-MALDI-HRMS) method for high-throughput quantitative analysis of androgenic steroid adulteration. A pair of isotope labeling reagents ( d 0 / d 5 -Girard's reagent P, d 0 / d 5 -GP) were employed to label steroids prior to MALDI-HRMS detection. The signal intensity was significantly improved, and the signal fluctuations were compensated by employing d 5 -GP labeled analytes as the internal standards. The limits of quantification (LOQs) of four steroids (nandrolone, testosterone, methyltestosterone , and testosterone propionate) were in the ranges of 0.18–0.48 μg/g. The calibration curves were obtained with acceptable linearities (R 2 > 0.99). The relative recoveries ranged from 87.9% to 118.1%, and the intra-day and inter-day relative standard deviations (RSDs) were all less than 13.4%, which were satisfactory for quantitative analysis. The potential of the GP labeling strategy to improve the MALDI detection sensitivity was further demonstrated by the successful detection of cinnamaldehyde and 2′-methoxycinnamaldehyde in cinnamon-containing samples. Compared with the reported methods, the developed method proved to be high-throughput, highly selective, and accurate for androgenic steroids analysis in complex samples with good sensitivity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chaoyi Zhou,Guojun Lv,Xuyang Zou,Jiangzhang Wang,Yan Chen,Jialing Shen,Shihao Su,Weilong Xing,Deling Fan,Yangbin Shen
Room-temperature ambient air is cheap and easy to obtain, hence the application of room-temperature ambient air as sole oxidant for pollutant degradation is extremely fascinating. In this work, core–shell coordination sponge-Fe 0 @Cu-Pd trimetal catalyst was synthesized via a simple step displacement plating process employing first displacement of Cu and the subsequent displacement of Pd, and applied as heterogeneous catalyst for synergistic catalytic degradation of composite pollutants including TC and PNP. The prepared s-Fe 0 @Cu-Pd trimetal sample was characterized with XRD, SEM, TEM, VSM and XPS. The characterization results revealed the obtained s-Fe 0 @Cu-Pd trimetal sample was a 20 ∼ 30 nm core–shell spherical morphology composed of Fe 0 aggregates core wrapped by a Cu-Pd shell layer. The obtained sponge-Fe 0 @Cu-Pd trimetal catalyst could efficiently activate room-temperature dissolved ambient oxygen and achieve the largest TC removal rate of 99.08 % and PNP removal rate of 97.16 % as well as the biggest removal rate constant of 8.76 min −1 for TC degradation and 7.55 min −1 for PNP degradation within 60 min at experimental conditions: [TC] = 30 mg/L, [PNP] = 30 mg/L, [Catalyst] = 25.52 g/L, pH = 3, 298 K ascribed to the strongest oxidation and reduction ability confirmed by CV characterizations, the lowest charge transfer and contact resistance affirmed by EIS measurements, the strongest O 2 activation ability verified by O 2 -TPD characterizations and DFT analyses, the largest external surface area and mesoporous volume validated by Nitrogen adsorption and desorption characterizations as well as the synergistic catalysis effect for wrapped Cu and Pd. Quenching experiments and EPR characterizations revealed that •OH, •O 2 − , 1 O 2 and •H are all the reactive species and meanwhile •O 2 − served as the main reactive oxygen species. Furthermore, possible mechanisms of TC and PNP degradation via sponge-Fe 0 @Cu-Pd trimetal catalyst were proposed.
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危险品化学品经营许可证（带存储）