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Author(s):  
Xiaoming Yang ◽  
Chi Zhang ◽  
Tao Zhang ◽  
Jin Xiao

Abstract Here, cobalt-doped plasma electrolytic oxidation (PEO) coatings with different cobalt contents were prepared on Ti implants. The cobalt ions in the PEO coating exhibited a slow and sustainable release and thus showed excellent biocompatibility and enhanced cell adhesion. In vitro ELISA and RT-PCR assays demonstrated that the cobalt-loaded Ti showed immunomodulatory functions to macrophages and upregulated the expression of anti-inflammatory (M1 type) genes and downregulated expression levels of pro-inflammatory (M2 type) genes compared with that of pure Ti sample. High cobalt content induced increased macrophage polarization into the M2 type. Furthermore, the findings from the in vivo air pouch model suggested that cobalt-loaded Ti could mitigate inflammatory reactions. The present work provides a novel strategy to exploit the immunomodulatory functions of implant materials.


Author(s):  
Xiao‐Hui Yang ◽  
Kai‐Fei Wang ◽  
Guo‐Hua Zhang ◽  
Kuo‐Chih Chou

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1256
Author(s):  
Liliya V. Yafarova ◽  
Grigory V. Mamontov ◽  
Irina V. Chislova ◽  
Oleg I. Silyukov ◽  
Irina A. Zvereva

The paper is focused on the Fe for Co substitution effect on the redox and catalytic properties in the perovskite structure of GdFeO3. The solid oxides with the composition GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) were obtained by the sol-gel method and characterized by various methods: X-Ray diffraction (XRD), temperature-programmed reduction (H2-TPR), N2 sorption, temperature-programmed desorption of oxygen (TPD-O2), simultaneous thermal analysis (STA), and X-ray photoelectron spectroscopy (XPS). The H2-TPR results showed that an increase in the cobalt content in the GdFe1−xCoxO3 (x = 0; 0.2; 0.5; 0.8; 1) leads to a decrease in the reduction temperature. Using the TPD-O2 and STA methods, the lattice oxygen mobility is increasing in the course of the substitution of Fe for Co. Thus, the Fe substitution in the perovskite leads to an improvement in the oxygen reaction ability. Experiments on the soot oxidation reveal that catalytic oxidation ability increases in the series: GdFe0.5Co0.5O3 ˂ GdFe0.2Co0.8O3 ˂ GdCoO3, which is in good correlation with the increasing oxygen mobility according to H2-TPR, TPD-O2, and STA results. The soot oxidation over GdFeO3 and GdFe0.8Co0.2O3 is not in this range due to the impurities of iron oxides and higher specific surface area.


Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5497
Author(s):  
Łukasz Dubiel ◽  
Andrzej Wal ◽  
Ireneusz Stefaniuk ◽  
Antoni Żywczak ◽  
Piotr Potera ◽  
...  

We present a study of the annealing effect and its influence on magnetic and structural properties for a series of Heusler alloys Ni50−xCoxMn35.5In14.5 (x=0,3,5) prepared in ribbon form. We studied the morphology and composition using scanning electron microscopy (SEM) equipped with an X-ray microanalyzer (EDX). The magnetic properties were determined by two methods: electron magnetic resonance (EMR) and vibrating sample magetometer (VSM). We found that cobalt content in the annealed samples reveals an additional magnetic phase transition at lower temperatures.


2021 ◽  
Vol 87 (8) ◽  
pp. 12-18
Author(s):  
V. N. Talanova ◽  
O. L. Lependina ◽  
D. Kh. Kitaeva ◽  
N. M. Kabaeva ◽  
R. U. Takazova ◽  
...  

Synthesizing and studying the properties of nanomaterials based on layered molybdenum disulfide, often face a need for rapid elemental analysis and prompt return of the material to the customer. Sometimes, nanoparticles of molybdenum disulfide are to be modified with metal compounds to improve the catalytic or magnetic properties of the material. We propose a method for rapid X-ray fluorescence determination of molybdenum and cobalt in the range of 10 – 50% in such compounds using a bulk method without dilution. Analytical signals were measured at the wavelengths of MoKα and CoKα lines using a VRA-30 spectrometer (Carl Zeiss, Germany; X-ray tube with Rh anode). The metal content was calculated using the derived coupling equations. The determination error ranges within ±2.7% (abs.) and 1.4% (abs.) for Mo and Co, respectively. Correctness of the method was confirmed for a batch of synthesized compounds by comparison of the results obtained with the data of XRF analysis using the dilution method traditionally used in the laboratory. The proposed rapid method provides simplification of the procedure and more than 4-fold shortening of analysis in time, the sample being preserved and can be used for further research.


Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3797
Author(s):  
Damian Wojcieszak ◽  
Michał Mazur ◽  
Patrycja Pokora ◽  
Adriana Wrona ◽  
Katarzyna Bilewska ◽  
...  

In this work, selected properties of metallic and oxide thin films based on titanium and cobalt were described. Thin-film coatings were prepared using the magnetron sputtering method. The deposition was carried out from sintered targets with different Co-content (2 at.%, 12 at.% and 50 at.%). The relation between the Ti–Co target composition and the Co-content in the metallic and oxide films was examined. There was 15–20% more cobalt in the films than in the target. Moreover, the deposition rate under neutral conditions (in Ar plasma) was even 10-times higher compared to oxidizing Ar:O2 (70:30) plasma. A comprehensive analysis of the structural properties (performed with GIXRD and SEM) revealed the amorphous nature of (Ti,Co)Ox coatings, regardless of the cobalt content in the coating. The fine-grained, homogenous microstructure was observed, where cracks and voids were identified only for films with high Co-content. Optical studies have shown that these films were well transparent (60% ÷ 80%), and the amount of cobalt in the target from which they were sputtered had a significant impact on the decrease in the transparency level, the slight shift of the absorption edge position (from 279 nm to 289 nm) as well as the decrease in their optical band gap energy (from 3.13 eV to 1.71 eV). Electrical studies have shown that in (Ti,Co)Ox thin films, a unipolar memristive-like effect can be observed. The occurrence of such effects has not been reported so far in the case of TiO2 coatings with the addition of Co.


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