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Study of Cell Behaviors on Anodized TiO_2 Nanotube Arrays with Coexisting multi-size Diameters

Nano-Micro Letters 2016年第1期8卷 61-69页

作者： Yifan Chen Jiahua Ni Hongliu Wu Ruopeng Zhang Changli Zhao Wenzhi Chen Feiqing Zhang Shaoxiang Zhang Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Material Science and Engineering Shanghai Jiao Tong University Suzhou Origin Medical Technology Co. Ltd.

It has been revealed that the different morphologies of anodized TiO_2 nanotubes, especially nanotube diameters, triggered different cell behaviors. However, the influence of TiO_2 nanotubes with coexisting multi-size diameters on cell behaviors is seldom reported. In this work, coexisting four-diameter TiO_2 nanotube samples, namely,one single substrate with the integration of four different nanotube diameters(60, 150, 250, and 350 nm), were prepared by repeated anodization. The boundaries between two different diameter regions show well-organized structure without obvious difference in height. The adhesion behaviors of MC3T3-E1 cells on the coexisting fourdiameter TiO_2 nanotube arrays were investigated. The results exhibit a significant difference of cell density between smaller diameters(60 and 150 nm) and larger diameters(250 and 350 nm) within 24 h incubation with the coexistence of different diameters, which is totally different from that on the single-diameter TiO_2 nanotube arrays. The coexistence of four different diameters does not change greatly the cell morphologies compared with the singlediameter nanotubes. The findings in this work are expected to offer further understanding of the interaction between cells and materials.

关键词： Coexisting multi-size TiO2 nanotubes Repeated anodization MC3T3-E1 cells Cell adhesion behaviors Cell-material interaction

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Coupling of ultrasmall and small CoxP nanoparticles confined in porous SiO2 matrix for a robust oxygen evolution reaction

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Nano Materials Science 2022年第4期4卷 393-399页

作者： Xiaojun Zeng Haiqi Zhang Xiaofeng Zhang Qingqing Zhang Yunxia Chen Ronghai Yu Martin Moskovits School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen333403China Guangdong Academy of Science Guangdong Institute of New MaterialsNational Engineering Laboratory for Modern Materials Surface Engineering TechnologyThe Key Lab of Guangdong for Modern Surface Engineering TechnologyGuangzhou510650China School of Materials Science and Engineering Beihang UniversityBeijing100191China Department of Chemistry and Biochemistry University of California Santa BarbaraSanta BarbaraCA93106United States

Rational design of electrocatalysts is important for a sustainable oxygen evolution reaction(OER).It is still a huge challenge to engineer active sites in multi-sizes and multi-components ***,a series of CoxP nanoparticles(NPs)confined in an SiO2matrix(SiO2/CoxP)is designed and synthesized as OER *** phosphorization of the hydrolyzed Co-phyllosilicate promotes the formation of ultrasmall and small Co2P and *** are firmly confined in the *** coupling of multi-size and multi-component CoxP catalysts can regulate reaction kinetics and electron transfer ability,enrich the active sites,and eventually promote the intrinsic OER *** SiO2matrix provides abundant porous structure and oxygen vacancies,and these facilitate the exposure of active sites and improve *** of the synergy and interplay of multisized/component CoxP NPs and the porous SiO2matrix,the unique SiO2/CoxP heterostructure exhibits low overpotential(293 m V@10 mA cm-2),and robust stability(decay 12 mV after 5000 CV cycles,97.4%of initial current after 100 h chronoamperometric)for the OER process,exceeding many advanced metal phosphide *** work provides a novel tactic to design low-cost,simple,and highly efficient OER electrocatalysts.

关键词： multi-size multi-component Phyllosilicate SiO2/CoxP heterostructure OER

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