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阴极脉冲参数对等离子体电解氧化制备自修复Al2O3-TiO2涂层的影响（英文）

Transactions of Nonferrous Metals Society of China 2024年第10期 3326-3343页

作者： mehri hashemzadeh Keyvan RAEISSI Fakhreddin ASHRAFIZADEH Frank SIMCHEN Amin HAKIMIZAD Monica SANTAMARIA Thomas LAMPKE Department of Materials Engineering Isfahan University of Technology Materials and Surface Engineering Group Institute of Materials Science and EngineeringChemnitz University of Technology Yekta Mobaddel Pars Co. Science and Technology Campus Yazd University Dipartimento di Ingegneria Università di Palermo

在含草酸钛钾（Potassium titanyl oxalate, PTO）的硅酸盐电解液中采用不同阴极占空比和阴极电流密度的脉冲双极波形，在7075铝合金上生长等离子电解氧化（Plasma electrolytic oxidation, PEO）涂层，研究阴极脉冲参数对PEO涂层的影... 详细信息

在含草酸钛钾（Potassium titanyl oxalate, PTO）的硅酸盐电解液中采用不同阴极占空比和阴极电流密度的脉冲双极波形，在7075铝合金上生长等离子电解氧化（Plasma electrolytic oxidation, PEO）涂层，研究阴极脉冲参数对PEO涂层的影响。通过扫描电子显微镜、能量色散X射线光谱（EDS）和X射线衍射（XRD）对涂层进行了表征。使用电化学阻抗谱（Electrochemical impedance spectroscopy, EIS）研究其电化学性能。结果表明，当阴极占空比和阴极电流密度分别从20%和6 A/dm2增加到40%和12 A/dm2时，内层的生长速率从0.22μm/min提高到0.75μm/min。向电解液中加入PTO增强了阴极脉冲的影响，由此产生的阴极脉冲参数的变化使得内层生长速率从0.25μm/min增加到1.10μm/min。EDS分析结果表明，Si和Ti主要分布在涂层的上部。XRD仅检测到γ-Al2O3，未检测到与Ti和Si化合物相关的峰。然而，EIS结果证实，Ti4+掺入氧化铝改变了涂层的电性能。在含有PTO的电解液中使用40%阴极占空比和大于6 A/dm2电流密度的双极波形获得的涂层，在240 d的浸泡期间表现出优异的电化学行为，这归因于有效的修复机制。关于研究参数对涂层性能的影响，强调了阴极脉冲参数和PTO在PEO过程中的作用。

关键词： Al2O3-TiO2涂层等离子电解氧化草酸钛钾电化学阻抗谱

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Incorporation mechanism of colloidal TiO_(2) nanoparticles and their effect on properties of coatings grown on 7075 Al alloy from silicate-based solution using plasma electrolytic oxidation

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Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3659-3676页

作者： mehri hashemzadeh Keyvan RAEISSI Fakhreddin ASHRAFIZADEH Amin HAKIMIZAD Monica SANTAMARIA Department of Materials Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran Yekta Mobaddel Pars Co. Science and Technology CampusYazd UniversityYazd 89158-18411Iran Dipartimento di Ingegneria Universitàdi PalermoViale Delle ScienzeEd.690128PalermoItaly

Plasma electrolytic oxidation(PEO)was applied using a pulsed unipolar waveform to produce Al_(2)O_(3)−TiO_(2) composite coatings from sol electrolytic solutions containing colloidal TiO_(2) *** sol solutions were produced by dissolving 1,3,and 5 g/L of potassium titanyl oxalate(PTO)in a silicate *** electron microscopy,energy dispersive spectrometry,X-ray diffraction,and Raman spectroscopy were applied to characterizing the *** behavior of the coatings was investigated using polarization and impedance *** results indicated that TiO_(2) enters the coating through all types of micro-discharging and is doped into the alumina *** higher level of TiO_(2) incorporation results in the decrease of surface micro-pores,while the lower incorporation shows a reverse *** was revealed that the higher TiO_(2) content makes a more compact outer layer and increases the inner layer thickness of the *** measurements revealed that the coating obtained from the solution containing 3 g/L PTO exhibits higher corrosion performance than that obtained in the absence of *** coating produced in the absence of PTO consists of γ-Al_(2)O_(3),δ-Al_(2)O_(3) and amorphous phases,while α-Al_(2)O_(3) is promoted by the presence of PTO.

关键词： Al alloy Al_(2)O_(3)−TiO_(2)coating plasma electrolytic oxidation potassium titanyl oxalate corrosion resistance

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Self-repairing AlO-TiOcoatings fabricated through plasma electrolytic oxidation with various cathodic pulse parameters

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Transactions of Nonferrous Metals Society of China 2023年

作者： mehri hashemzadeh Keyvan Raeissi Fakhreddin Ashrafizadeh Frank Simchen Amin Hakimizad Monica Santamaria Thomas Lampke Department of Materials Engineering， Isfahan University of Technology Yekta Mobaddel Pars Co.， Science and Technology Campus， Yazd University Materials and Surface Engineering Group， Institute of Materials Science and Engineering， Chemnitz University of Technology Dipartimento di Ingegneria， Università di Palermo， Viale Delle Scienze

The influence of cathodic pulse parameters was evaluated on PEO coatings grown on 7075 aluminum alloy in a silicate-based electrolyte containing potassium titanyl oxalate (PTO) using pulsed bipolar waveforms with various cathodic duty cycles and cathodic current densities. The coatings were characterized by SEM， EDS， and XRD. EIS was applied for investigating the electrochemical properties. It was observed that the increase of cathodic duty cycle and cathodic current density from 20% and 6 A dm-2to 40% and 12 A dm-2enhances the growth rate of the inner layer from 0.22 μm min-1to 0.75 μm min-1. Adding PTO into the bath showed a fortifying effect on influence of the cathodic pulse and the mentioned change of cathodic pulse parameters resulted in an increase of the inner layer growth rate from 0.25 to 1.10 μm min-1. Based on EDS analysis， Si and Ti were incorporated dominantly in the upper parts of the coatings. XRD technique merely detected γ-Al2O3， and there were no detectable peaks related to Ti and Si compounds. However， the EIS results confirmed that the incorporation of Ti4+into alumina changed the electronic properties of the coating. The coatings obtained from the bath containing PTO using the bipolar waveforms with a cathodic duty cycle of 40% and current density values higher than 6 A dm-2showed highly appropriate electrochemical behavior during 8 months of immersion due to an efficient repairing mechanism. Regarding the effects of studied parameters on the coating properties， the roles of cathodic pulse parameters and PTO in the PEO process were highlighted.

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Increased levels of miR-124 in human dental pulp stem cells alter the expression of neural markers

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Journal of Otology 2019年第4期14卷 121-127页

作者： Ameneh mehri-Ghahfarrokhi Zahra Pourteymourfard-Tabrizi Effat Farrokhi Morteza hashemzadeh Chaleshtori Mohammad-Saeid Jami Department of Molecular Medicine School of Advanced TechnologiesShahrekord University of Medical SciencesShahrekordIran Cellular and Molecular Research Center Basic Health Sciences InstituteShahrekord University of Medical SciencesShahrekordIran Department of Neurology David Geffen School of MedicineUniversity of California Los Angeles(UCLA)Los AngelesCAUSA

Auditory neuropathy is the particular form of deafness in humans which cannot be treated by replacement *** dental pulp stem cells(hDPSCs)are derived from an ectomesenchymal neural crest cell ***,they possess a promising capacity for neuronal differentiation and ***-124,a key regulator of neuronal development in the inner ear,is expressed at high levels in auditory and vestibular ***,we evaluated the possible effect of miR-124 in alteration of neural protein markers *** quantitative reverse transcription-PCR(qRT-PCR)analyses and immunofluorescence staining,we studied the expression patterns of neural progenitor markers(Nestin,NOTCH1,and SOX2)and neural markers(b-tubulin Ⅲ,GATA-3,and peripherin)upon transfection of hDPSCs with *** qRT-PCR results showed that Nestin was upregulated 6 h *** contrast,Nestin expression exhibited a decreasing trend 24 h and 48 h *** levels of b-tubulin Ⅲ,6 h and 16 h post transfection in RNA level as compared with control cells,were determined in transfected ***,b-tubulin-Ⅲ expression decreased 48 h *** immunoflourescence results indicated that transfection of hDPSCs with miR-124,only affected Nestin among the studied neural progenitor and neural marker expression in protein level.

关键词： Sensorineural hearing loss miR-124 Spiral ganglion neurons Nestin DPSCs

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