Acta of Bioengineering and Biomechanics
·
2023
·Vol. 25
·期 4
·111-120
·
IF 1
Runze An,Wenmin Tang,Zhanpeng Zhao,Wentao Liu,Liang Kan
Purpose: Curcumin and icariin have multiple pharmacological effects and are widely used in various fields, but their short half-life, poor bioavailability and low water solubility greatly limit their application in clinical medicine. Poly(lactide-co-glycolide) (PLGA) loaded microspheres not only solve these problems, but also have no toxicity in degradation.
Methods: To verify whether PLGA drugloaded microspheres have good biocompatibility, the present experiments used the emulsification-solvent evaporation method to prepare PLGA drug-loaded microspheres and successfully performed the loading of curcumin and icariin.
Results: The scanning electron microscopy showed that the particle sizes of the PLGA microspheres were 2–15 μm, icariin/PLGA microspheres were 3–22 μm and curcumin/PLGA microspheres were 5–30 μm. Moreover, the surface of the microspheres was smooth and spherical. Furthermore, the drug loading and encapsulation rate were good. In vitro experiments revealed that the prepared PLGA microspheres were safe and nontoxic, and that they could release drugs stably and slowly. Moreover, their proliferation ability was unaffected after inoculation into bone marrow mesenchymal stem cells (BMSCs), and Alcian blue Staining was performed at last, demonstrating their biocompatibility and important applications in tissue engineering.
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OPTICAL MATERIALS
·
2020
·
IF 2.779
Feng Tian,Cong Chen,Qiang Liu,Roman Yavetskiy,Maxim Ivanov,Stanislav Balabanov,Yagang Feng,Xin Liu,Ziyu Liu,Dianjun Hu,Zhaoxiang Yang,Tengfei Xie,Jiang Li
Nd:YAG transparent ceramics were obtained by vacuum sintering from nanopowders synthesized by co-precipitation method. The co-precipitated powder was optimized by studying calcination temperature (from 800 to 1300 °C) of the precursor and ball-milling time (from 0 to 24 h). Influences of calcination temperature and ball-milling time on comprehensive properties of nanopowders were studied in detail. Influences of sintering conditions (sintering temperature and holding time) on transmittance and microstructure were also investigated. The conclusions based on a comprehensive study of the whole ceramics processing from the powders synthesis to Nd:YAG ceramics sintering. The co-precipitated powder calcined at 1250 °C with ball-milling for 12 h demonstrates relatively better comprehensive properties. The 1.0 at% Nd:YAG ceramic sample with the thickness of 1.3 mm sintered at 1775 °C for 20 h has the highest in-line transmittance of 76.0% at 1064 nm.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 8
·1-7
·
IF 2.02
Li Nannan,Liu Jian,Duan Xiulan,Yu Fapeng,Jiang Huaidong
This report discusses the preparation and microstructure of Co/Ni co-doped MgGa 2 O 4 nanoparticles. The nanoparticles with the size of 20–55 nm were synthesized by sol-gel method. The phase and crystallinity were confirmed by X-ray powder diffraction (XRD) pattern. The particle size was estimated according to XRD data and transmission electron microscopy. The electronic structure was studied using X-ray photoelectron spectroscopy (XPS). The XPS studies showed that Ga 3+ ions possess tetrahedral and octahedral sites of spinel structure and the inverse degree (two times of the fraction of tetrahedral Ga 3+ ions) has increased with the increase of the doping concentration of Co 2+ and Ni 2+ ions. For Co/Ni co-doped MgGa 2 O 4 , two broad absorption bands of 350~500 and 550~700 nm were observed in the absorption spectra. The broad band at 350~500 nm was assigned to the combination of the absorption of octahedral Co 2+ and Ni 2+ ions, whereas the absorption band at 550~700 nm is mainly due to tetrahedrally coordinated Co 2+ ions and octahedrally coordinated Ni 2+ ions.
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JOURNAL OF LOW TEMPERATURE PHYSICS
·
2022
·Vol. 209
·期 1
·166-181
·
IF 1.618
Shen JiYu,Mo JiaJun,Tao YuChen,Xia YanFang,Liu Min
The study of spinel ferrite ion sites is an important aspect to optimize its structure. In this report, homogeneous and stable mixed spinels CoFe 2 O 4 and MgFe 2 O 4 were synthesized by a simple sol–gel combustion method. The Curie temperature is higher than 400 K, so the Mössbauer spectrum at room temperature shows a typical magnetically ordered Zeeman sextet. The change in the hyperfine magnetic field is consistent with the change in the saturation magnetization, which can be explained by the change in the superexchange contribution between each point. The frozen magnetic moment at low temperature makes CoFe 2 O 4 appear partly independent of antiferromagnetic domain contribution. The competitive ability of the ion to the B site is Mg 2+ > Co 2+ > Fe 3+ , which will provide some guidance for the structural optimization of spinel ferrite.
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CHEMICAL PAPERS
·
2016
·Vol. 70
·期 12
·1632-1641
·
IF 1.326
Hui-Hong Lü,Min-Zhi Wu,Zheng-Li Zhang,Xing-Rong Wu,Liao-Sha Li,Zhi-Fang Gao
The co-precipitation behaviour of a simulated Al 2 (SO 4 ) 3 –TiOSO 4 –Na 2 SiO 3 solution that imitated the lixivium of Ti-bearing blast furnace slag (Ti-slag) leached by sulphuric acid was investigated in this study. Various chemical analyses were employed to study the selective precipitation of multiple target components. Based on the high-added-value applications of Ti-slag, a new method was developed to prepare aluminium titanate composites from titanium-containing silicates. The findings demonstrate that the onsets of Ti and Al precipitation occur at pH values of 3.5 and 5.0, respectively, followed by Si precipitation. The particle sizes of the co-precipitates were greatly influenced by the precipitants, pH and the initial Al/Ti mole ratio. The results also show that the precipitation ratio of Ti, Al and Si generally increases with the pH and temperature, regardless of the Al/Ti mole ratio. The Si-O-Al, Ti-O-Al, and Ti-O-Si bonds that were formed were dependent on the pH and the initial Al/Ti mole ratio. There was a synthesis path for β -Al 2 TiO 5 (AT) from the solid-state reaction between rutile and α -Al 2 O 3 at 1362.5°C. The AT composites were successfully prepared by sintering the co-precipitates at 1450°C, which exhibited good thermal stability as estimated by the XRD measurements of the sample annealed at 1200°C for 4 hours.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Liyuan Guo,Nengneng Xu,Tuo Lu,Qin Cao,Momo Safari,Jong Min Kim,Yongxia Wang,Jinli Qiao
The rational design of bifunctional electrocatalysts with abundant active sites and efficient charge/mass transport is crucial for Zn-air batteries. Here, we report a scalable electrospinning strategy to fabricate Co/N-doped carbon nanofibers (CNFs) with a beaded architecture derived from ZIF-67@PAN precursors. By precisely tuning the ZIF-67 loading, the intercluster spacing along the fibers can be controlled, yielding well-dispersed Co nanoparticles and Co-N x moieties after pyrolysis. Critically, vertically stacked nanofibrous membranes enable scalable manufacturing. The optimized Co/Co-N x -C@CNF-1.5 exhibits superior bifunctional activity (Δ E = 0.815 V), benefiting from balanced active-site density, rapid electron transport, and hierarchical porosity. Density functional theory calculations further reveal the microscopic origin that an appropriate spacing enables moderate electronic coupling between adjacent Co-based active sites, thereby optimizing the adsorption energetics of oxygen intermediates and facilitating ORR/OER kinetics. As an air cathode, the liquid Zn-air battery delivers a peak power density of 406.5 mW cm −2 , an energy density of 976 Wh kg −1 , and a long cycling stability of ∼2143 h. The quasi-solid-state device also shows high power output, stable operation, and excellent flexibility. This work demonstrates a general electrospinning-pyrolysis approach to engineer MOF-derived self-supporting electrodes, bridging high-performance electrocatalysis with practical energy storage applications.
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Coatings
·
2025
·Vol. 15
·期 7
·772
·
IF 2.8
Ruidan Duan,Jianhang Ding,Jiawei Fan,Linzhou Zhuang
To address mass transport limitations in carbon nanofiber membrane electrodes for overall water splitting, a self-supporting nitrogen-doped hollow carbon nanofiber membrane embedded with Co/Co2P heterojunctions (Co/Co2P-NCNFs-H) was fabricated via continuous coaxial electrospinning. The architecture features uniform hollow channels (200–250 nm diameter, 30–50 nm wall thickness) and a high specific surface area (254 m2g−1), as confirmed by SEM, TEM, and BET analysis. The Co/Co2P heterojunction was uniformly dispersed on nitrogen-doped hollow carbon nanofibers through electrospinning, leverages interfacial electronic synergy to accelerate charge transfer and optimize the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). Electrochemical tests demonstrated exceptional catalytic activity, achieving current densities of 100 mA cm−2at ultralow overpotentials of 405.6 mV (OER) and 247.9 mV (HER) in 1.0 M KOH—surpassing most reported transition metal catalysts for both half-reactions. Moreover, the electrode exhibited robust long-term stability, maintaining performance for nearly 20 h at 0.6 V (vs. Ag/AgCl) (OER) and over 250 h at −1.5 V (vs. Ag/AgCl) (HER), attributed to the mechanical integrity of the hollow architecture and strong metal–carbon interactions. This work demonstrates that integrating hollow nanostructures (enhanced mass transport) and heterojunction engineering (optimized electronic configurations) creates a scalable strategy for designing efficient bifunctional catalysts, offering significant promise for sustainable hydrogen production via water electrolysis.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jiyuan Cong,Yusha Lan,Jianglin Hu,Gang Chen,Chengjun Dong,Hongtao Guan
The nitrogen–doped porous carbon (NPC) foam composites modified by magnetic nanoparticles exhibit lightweight properties and excellent impedance matching, making them highly valuable for research and applications in electromagnetic wave shielding and absorption. The present work focuses on binary Co/Ni–MOF as the subject, combining it with carbon foam by adjusting the Co/Ni ratio to obtain various MOF derivatives, thereby exploring their electromagnetic properties. The composite CoNi-2/NPC, yielded through calcinating the precursor CoNi-2/HMT (Co: Ni = 1: 1) at 500 °C, demonstrates excellent wave absorption performance with a low filler content of 15 wt%, achieving a minimum reflection loss of –52.7 dB and an effective absorption bandwidth of 7.36 GHz. The radar cross section (RCS) simulation reveals an RCS reduction of 22.8 dB m² for CoNi-2/NPC. The excellent electromagnetic absorption can be ascribed to the increased interfacial polarization, the improved impedance matching, and defect-induced polarization loss. The present research offers a novel perspective for the design of high–performance electromagnetic absorbing materials featuring a broad absorption bandwidth through controlling their magnetic components.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Xiaohong Li,Cai Ye,Jianjun Chen,Meijing Wang
A novel aluminum and titanium co-doped polycarbosilane (PATCS) was synthesized by the reaction of liquid polycarbosilane (LPCS), Al(acac) 3 , and Ti(Cp) 2 Cl 2 . The thermal polymerization mechanism of the PATCS was that Si-H bonds in LPCS reacted with C=C/Ti-Cl bonds in Ti(Cp) 2 Cl 2 and Al-O-C/Al-O=C groups in Al(acac) 3 to form Si-Ti, Si-C-C, Si-O-Al bonds. The TG-DSC results showed that the synthesized PATCS exhibited greater stability and a higher ceramic yield compared to PACS. A novel type Si(Al,Ti)CO ceramic fibers (AT-11) with tensile strength (2222 MPa) were obtained by melt-spining, curing, pyrolysis of the synthesized PATCS. After sintering, the AT-13 showed excellent electromagnetic wave absorption. When the thickness reached 2.3 mm, the minimum reflection loss (RL min ) vaule and the EAB were -52.02 dB and 5.12 GHz (RL < −10 dB, 10.64-15.76 GHz), respectively. While the AT-18 fibers showed higher high-temperature creep resistance in the range of 1300∼1700 °C than those of Si(Al)C ceramic fibers.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Zezhuang Wang,Yue Lyu,Baihe Guo,Yuchuan Feng,Haiyu Liu,Yan Jin,Juntian Niu
The efficient removal of ultra-low concentration methane from sources like coal mine ventilation air is crucial for mitigating greenhouse gas emissions. This study systematically investigates the effects of synthesis methods (impregnation, combustion, sol-gel, and co-precipitation) and Cu/Co ratios on the catalytic performance of Cu-Co/CeO 2 catalysts for ultra-low concentration methane combustion. Characterization results demonstrate the structural advantages of the optimal catalyst. XRD patterns confirm the successful formation of a CuCo 2 O 4 spinel phase. SEM images show a uniform morphology with minimal agglomeration. XPS analysis further reveals the coexistence of Cu 2+ /Cu + and Co 3+ /Co 2+ redox couples accompanied by abundant adsorbed oxygen species. Experiments demonstrate that the 1Cu-4Co/CeO 2 catalyst prepared by co-precipitation exhibits optimal low-temperature activity, with T 10 and T 90 values of 330 °C and 566 °C, respectively. Stability evaluations over 20 h at 500 °C show minimal activity decay, with the catalyst retaining 94.2% of its initial conversion. The superior performance is attributed to the synergistic redox interaction between Cu and Co, optimized surface oxygen mobility, and robust structural stability. This work provides an effective strategy for designing non-noble metal catalysts for ultra-low concentration methane purification.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Ziyi Xu,Meiling Fan,Shifeng Tan,Rui Wang,Wenmao Tu,Xiege Huang,Hongfei Pan,Haining Zhang,Haolin Tang
The development of efficient and stable electrocatalysts for hydrogen evolution reaction (HER) is impending for the advancement of water-splitting. In this study, we developed a novel electrocatalyst consisting of highly dispersed Ru nanoclusters ameliorated by cobalt single atoms and N, S co-doped reduced graphene oxide (Co SA Ru NC @NSG). Benefitted from the optimized electronic structure of the Ru nanoclusters induced by the adjacent single atomic Co and N, S co-doped RGO support, the electrocatalyst exhibits exceptional HER performance with overpotentials of 15 mV and 74 mV for achieving a current density of 10 mA cm −2 in alkaline and acidic water. The catalyst outperforms most noble metal-based HER electrocatalysts . Furthermore, the electrolyzer assembled with Co SA Ru NC @NSG and RuO 2 demonstrated an overall voltage of 1.56 V at 10 mA cm −2 and an excellent operational stability for over 25 h with almost no attenuation. Theoretical calculations also deduce its high HER activity demonstrated by the smaller reaction energy barrier due to the optimized electronic structure of Ru nanoclusters . This strategy involving the regulation of metal nanoparticles activity through flexible single atom and GO support could provide valuable insights into the design of high-performance and low-cost HER catalysts.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Shuang Meng,Minglu Sun,Peng Zhang,Chenying Zhou,Chuanshu He,Heng Zhang,Yang Liu,Zhaokun Xiong,Peng Zhou,Bo Lai
The continuous electron supply for oxidant decomposition-induced reactive oxygen species (ROS) generation is the main contributor for the long-standing micropollutant oxidation in the iron-based advanced oxidation processes (AOPs). Herein, as a new class of co-catalysts, metal borides with dual active sites and preeminent conductive performance can effectively overcome the inherent drawback of Fenton-like reactions by steadily donating electrons to inactive Fe(III). Among the metal borides, tungsten boride (WB) exhibits a significant co-catalytic performance run ahead of common heterogeneous co-catalysts and exceptionally high stability. Based on qualitative and semi-quantitative tests, the hydroxyl radical, sulfate radical, and iron(IV)-oxo complex are all produced in the WB/Fe(III)/PDS system and Fe(IV)-induced methyl phenyl sulfoxide decomposition is up to 72%. Moreover, the production efficiency of ROS and relative proportions of radical and nonradical pathways change with various experimental conditions (dosages of PDS, WB, and solution pH) and water matrices. The rate-determining step of Fe(II) regeneration is greatly accelerated resulting from the synergetic effect between exposed metallic reactive sites and nonmetallic boron with reductive properties of WB. In addition, the self-dissolution of surface tungsten oxide and boron oxide leads to a renovated surface for sustainable Fe(III) reduction in long-term operations. Our discovery provides an efficient and sustainable strategy in the field of enhanced AOPs for water remediation.
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PubMed
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