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multi-walled carbon nanotubes reversing the bone formation of bone marrow stromal cells by activating M2 macrophage polarization

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Regenerative Biomaterials 2023年第1期10卷 980-989页

作者： Runlian Lin Kun Ge Dehui Fan Jing Li Guoqiang Zhou Kaihan Zhang Yuanyu Huang Lili Ma Jinchao Zhang Key Laboratory of Medicinal Chemistry and Molecular Diagnosis of the Ministry of Education Key Laboratory of Chemical Biology of Hebei ProvinceCollege of Chemistry and Material ScienceHebei UniversityBaoding 071002China College of Basic Medical Science Hebei UniversityBaoding 071000China Department of Chemistry The University of ManchesterManchester M139PLUK School of Life Science School of Medical TechnologyAdvanced Research Institute of Multidisciplinary ScienceKey Laboratory of Molecular Medicine and BiotherapyKey Laboratory of Medical Molecule Science and Pharmaceutics EngineeringBeijing Institute of TechnologyBeijing 100081China

multi-walled carbon nanotubes(MWCNTs)are an excellent bone tissue repair material both in vitro and in *** interactions between MWCNTs and single type of cells of bone tissue,including osteoblasts,bone marrow stromal cells(BMSCs)or osteoclasts,have been extensively ***,the interactions between MWCNTs with different types of cells in the bone microenvironment remain *** microenvironment is a complex system composed of different types of cells,which have interactions between each *** this work,the effects of MWCNTs on bone microenvironment were firstly studied by culture of MWCNTs with BMSCs,osteoblasts,osteoclasts,macrophages and vascular endothelial cells,***,co-culture systems of macrophages-BMSCs,macrophages-calvaria and macrophages-BMSCs-vascular endothelial cells were treated with MWCNTs,*** osteogenic differentiation of BMSCs and osteoblasts was inhibited when these two types of cells were cultured with MWCNTs,***,when co-culture MWCNTs with BMSCs and macrophages,the osteogenesis of BMSCs was promoted by inducing the M2 polymerization of ***,MWCNTs promoted the bone formation in the osteolysis model of calvaria ex *** addition,the formation of osteoclasts was inhibited,and angiogenesis was increased when treated with *** study revealed the inconsistent effects of MWCNTs on single type of bone cells and on the bone *** results provided basic research data for the application of MWCNTs in bone tissue repair.

关键词： multi-walled carbon nanotubes bone microenvironments osteogenesis bone marrow stromal cells M2 macrophages cellular interactions

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multi-walled carbon nanotubes covalently functionalized by axially coordinated metal-porphyrins： Facile syntheses and temporally dependent optical performance

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Nano Research 2016年第2期9卷 458-472页

作者： Aijian Wang Jingbao Song Zhipeng Huang Yinglin Song Wang Yu Huanli Dong Wenping Hu Marie P. Cifuentes Mark G. Humphrey Long Zhang Jianda Shao Chi Zhang China-Australia Joint Research Center for Functional Molecular Materials Scientific Research Academy Jiangsu UniversityZhenjiang 212013 China China-Australia Joint Research Center for Functional Molecular Materials School of Chemical and Material Engineering Jiangnan University Wuxi 214122 China Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China School of Physical Science and Technology Soochow University Suzhou 215006 China Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Research School of Chemistry Australian National University Canberra ACT2601 Australia

Axially coordinated metal-porphyrin-functionalized multi-walled carbon nanotube （MWCNT） nanohybrids were prepared via two different synthetic approaches （a one-pot 1,3-dipolar cycloaddition reaction and a stepwise approach that involved 1,3-dipolar cycloaddition followed by nucleophilic substitution）, and characterized through spectroscopic techniques. Attachment of the tin porphyrins to the surface of the MWCNTs significantly improves their solubility and ease of processing. These axially coordinated （5,10,15,20-tetraphenylporphyrinato）tin（Ⅳ）（SnTPP）- MWCNTs exhibit significant fluorescence quenching. The third-order nonlinear optical properties of the resultant nanohybrids were studied by using the Z-scan technique at 532 nm with both nanosecond and picosecond laser pulses. The results show that the nanohybrids exhibit significant reverse saturable absorption or saturable absorption when nanosecond or picosecond pulses, respectively, are employed. Improvement in the nanosecond regime nonlinear absorption is observed on proceeding to the nanohybrids and is ascribed to a combination of the outstanding properties of MWCNTs and the chemically attached metal-porphyrins.

关键词： metal-porphyrin axially coordinated multi-walled carbon nanotubes facile syntheses optical performance cycloaddition

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multi-walled carbon nanotubes as a Ligand in Nickel ?-Diimine Based Ethylene Polymerization

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Chinese Journal of Polymer Science 2015年第10期33卷 1389-1403页

作者： Sasan Talebnezhad Saeed Pourmahdian Department of Polymer Engineering and Color Technology Amirkabir University of Technology

Two novel heterogeneous nickel a-diimine based polymerization catalysts, containing MWCNT as the main ligand, were synthesized by novel in situ catalyst preparation technique. The in situ synthesis was performed by covalent attachment of the acenaphthenic ligand core to amine functionalized MWCNT ligand arms through diimine bonding and further nickel dibromide chelation. The prepared catalysts were fully characterized and their structures and supporting efficiencies were determined. Single or double introduction of the MWCNTs through their ends or sidewall（s） in the catalytic system, as a ligand, influenced the catalytic performance, microstructure and morphology of obtained polyethylenes. MWCNT sidewall bonding to para-aryl position of the tetramethylphenyl moiety performed as more electron-donating ligand than MWCNT ends linked to the imine bond and protected the catalytic system to retain its activity. This character resulted in the maintenance of the resulting polymer topology at elevated temperatures so that the catalytic activity and the obtained polymer melting points remained around 110 g PE·mmol^-1 Ni·h^-1 and 123 ℃ in all polymerization temperatures respectively. In polymerization trials, molecular weight fall against temperature was not as sharp as what had been observed in sequentially prepared catalysts insofar as the molecular weight of resultant polymer at 60 ℃ reached to 310000 g·mol^-1 which was close to the highest value had been reported at 30 ℃ for sequentially prepared catalysts. TEM observations showed the presence of the stopped-growth polymer chains due to geometrical constrains or ligand debonding for both catalytic systems.

关键词： a-Diiminonickel catalyst Ligand multi-walled carbon nanotubes Ethylene polymerization In situ catalyst preparation.

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NaFeTiO4 nanorod/multi-walled carbon nanotubes composite as an anode material for sodium-ion batteries with high performances in both half and full cells

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Nano Research 2017年第10期10卷 3585-3595页

作者： Xuan Hou Chuanchuan Li Huayun Xu Liqiang Xu Key Laboratory of Colloid & Interface Chemistry (Shandong University) Ministry of Education and School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China

NaFeTiO4 nanorods of high yields （with diameters in the range of 30-50 nm and lengths of up to 1-5 μm） were synthesized by a facile sol-gel method and were utilized as an anode material for sodium-ion batteries for the first time. The obtained NaFeTiO4 nanorods exhibit a high initial discharge capacity of 294 mA·h·g^-1 at 0.2 C （1 C = 177 mA·g^-1）, and remain at 115 mA·h·g^-1 after 50 cycles. Furthermore, multi-walled carbon nanotubes （MWCNTs） were mechanically milled with the pristine material to obtain NaFeTiO4/MWCNTs. The NaFeTiO4/MWCNTs electrode exhibits a significantly improved electrochemical performance with a stable discharge capacity of 150 mA·h·g^-1 at 0.2 C after 50 cycles, and remains at 125 mA·h·g^-1 at 0.5 C after 420 cycles. The NaFeTiO4/MWCNTs//Na3V2（PO4）3/C full cell was assembled for the first time; it displays a discharge capacity of 70 mA·h·g^-1 after 50 cycles at 0.05 C, indicating its excellent performances. X-ray photoelectron spectroscopy, ex situ X-ray diffraction, and Raman measurements were performed to investigate the initial electrochemical mechanisms of the obtained NaFeTiO4/MWCNTs.

关键词： nanorods sodium-ion batteries multi-walled carbon nanotubes full cell

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DYNAMIC STABILITY ANALYSIS OF EMBEDDED multi-walled carbon nanotubes IN THERMAL ENVIRONMENT

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Acta Mechanica Solida Sinica 2015年第6期28卷 659-667页

作者： R.Ansari R.Gholami S.Sahmani A.Norouzzadeh M.Bazdid-Vahdati Department of Mechanical Engineering University of Guilan Department of Mechanical Engineering Lahijan BranchIslamic Azad University

In the present paper, the dynamic stability of multi-walled carbon nanotubes （MW- CNTs） embedded in an elastic medium is investigated including thermal environment effects. To this end, a nonlocal Timoshenko beam model is developed which captures small scale effects. Dynamic governing equations of the carbon nanotubes are formulated based on the Timoshenko beam theory including the effects of axial compressive force. Then a parametric study is conducted to investigate the influences of static load factor, temperature change, nonlocal parameter, slenderness ratio and spring constant of the elastic medium on the dynamic stability characteristics of MWCNTs with simply-supported end supports.

关键词： multi-walled carbon nanotubes dynamic stability nonlocal elasticity thermal environment small scale effect

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Electron irradiation-induced change of structure and damage mechanisms in multi-walled carbon nanotubes

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Chinese Physics B 2015年第11期24卷 333-341页

作者：杨剑群李兴冀刘超铭马国亮高峰 School of Materials Science and Engineering Harbin Institute of Technology National Center for Nanoscience and Technology Chinese Academy of Sciences

Owing to their unique structure and excellent electrical property, carbon nanotubes （CNTs） as an ideal candidate for making future electronic components have great application potentiality. In order to meet the requirements for space appli- cation in electronic components, it is necessary to study structural changes and damage mechanisms of multi-walled carbon nanotubes （MWCNTs）, caused by the irradiations of 70 and 110 keV electrons. In the paper, the changes of structure and damage mechanisms in the irradiated MWCNTs, induced by the irradiations of 70 and 110 keV electrons, are investigated. The changes in surface morphology and structure of the irradiated MWCNT film are characterized using scanning electron microscopy （SEM）, x-ray photoelectron spectroscopy （XPS）, Raman spectroscopy, x-ray diffraction analysis （XRD）, and electron paramagnetic resonance （EPR） spectroscopy. It is found that the MWCNTs show different behaviors in structural changes after 70 and 110 keV electron irradiation due to different damage mechanisms. SEM results reveal that the irra- diation of 70 keV electrons does not change surface morphology of the MWCNT film, while the irradiation of 110 keV electrons with a high fluence of 5 x 1015 cm-2 leads to evident morphological changes, such as the formation of a rough surface, the entanglement of nanotubes and the shrinkage of nanotubes. Based on Raman spectroscopy, XPS, and XRD analyses, it is confirmed that the irradiation of 70 keV electrons increases the interlayer spacing of the MWCNTs and disorders their structure through electronic excitations and ionization effects, while the irradiation of 110 keV electrons obviously reduces the interlayer spacing of the MWCNTs and improves their graphitic order through knock-on atom dis- placements. The improvement of the irradiated MWCNTs by 110 keV electrons is attributed to the restructuring of defect sites induced by knock-on atom displacements. EPR spectroscopic analyses reveal that the MWCNTs exp

关键词： electron irradiation multi-walled carbon nanotubes damage mechanisms Raman spectroscopy

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Radiation induced graft polymerization of multi-walled carbon nanotubes for superhydrophobic composite membrane preparation

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Science China Chemistry 2016年第3期59卷 303-309页

作者： Bowu Zhang Siyuan Xie Rongmao Wei Hongjuan Ma Ming Yu Linfan Li Jingye Li CAS Centre for Excellence on TMSR Energy System Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Guangxi Foreign Capital Poverty Reduction Project Management Center

Highly soluble multi-walled carbon nanotubes （MWNTs） were prepared by radiation-induced free radical graft polymerization of vinyl acetate （VAc） onto pristine MWNT surfaces. High resolution transmission electron microscopy （HR-TEM）, Fourier transform infrared （FT1R） spectroscopy, and micro-Raman spectroscopy were used to confirm that poly（vinyl acetate）（PVAc） had been successfully grafted onto the surface of the MWNTs. The effects of experimental parameters on the degree of graft- ing （DG） of PVAc were also investigated, including adsorbed dose, dose rate, initial monomer concentration, and solvents. The grafted MWNTs （MWNTs-g-PVAc） exhibited good solubility in common organic solvents at high mass fraction. In addition, a superhydrophobic composite membrane could be readily fabricated by vacuum filtration of MWNTs-g-PVAc onto a support- ing membrane, as was confirmed by water contact angle testing and visualization by scanning electron microscopy.

关键词： multi-walled carbon nanotubes radiation induced graft polymerization surface modification superhydrophobic membrane

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High thermoelectric and mechanical performance in the n-type polycrystalline SnSe incorporated with multi-walled carbon nanotubes

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Journal of Materials Science & Technology 2022年第19期114卷 55-61页

作者： Xin-Yu Mao Xiao-Lei Shi Liang-Chuang Zhai Wei-Di Liu Yue-Xing Chen Han Gao Meng Li De-Zhuang Wang Hao Wu Zhuang-Hao Zheng Yi-Feng Wang Qingfeng Liu Zhi-Gang Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Centre for Future Materials University of Southern QueenslandSpringfield CentralBrisbane4300Australia School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD 4000Australia Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD 4072Australia Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Material Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China School of Mechanical and Mining Engineering The University of QueenslandSt LuciaBrisbaneQLD 4072Australia College of Materials Science and Engineering Nanjing Tech UniversityNanjing 211816China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing Tech UniversityNanjing 211816China CAS Key Laboratory of carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China

In this study,we introduce multi-walled carbon nanotubes(MWCNTs)in Pb/I co-doped n-type polycrys-tal SnSe to simultaneously improve its thermoelectric and mechanical properties for the first *** introduced MWCNTs act as the“bridges”to accelerate the electron carrier transport between SnSe grains,leading to significantly increased electrical conductivity from 32.6 to 45.7 S cm^(−1) at 773 K,which con-tributes to an enhanced power factor of∼5.0μW cm^(−1) K^(−2) at this *** MWCNTs possess high intrinsic thermal conductivities,these MWCNTs,acting as nanoinclusions in the SnSe matrix to form the dense interfaces between SnSe and MWCNTs,provide extra heat-carrying phonon scattering centers,leading to a slightly reduced lattice thermal conductivity of only 0.34 W m^(−1) K^(−2) at 773 K and in turn,a high ZT of∼1.0 at this ***,the introduced MWCNTs can simultane-ously act as the“binders”to bond adjacent grains,significantly improving the mechanical properties of SnSe by boosting its Vickers hardness from 39.5 to *** work indicates that our facile approach can achieve high thermoelectric and mechanical properties in n-type SnSe polycrystals with a considerable potential for applying to thermoelectric devices as n-type elements.

关键词： Thermoelectric property SnSe N-type multi-walled carbon nanotubes Mechanical property

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A simple and sensitive method for the determination of 4-n-octylphenol based on multi-walled carbon nanotubes modified glassy carbon electrode

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Journal of Environmental Sciences 2012年第9期24卷 1717-1722页

作者： Qiaoli Zheng Ping Yang He Xu Jianshe Liu Litong Jin School of Environmental Science and Engineering Donghua University Shanghai 201620 China Department of Chemistry East China Normal University Shanghai 200062 China

A simple and sensitive electroanalytical method was presented for the determination of 4-n-octylphenol （OP） based on multi-walled carbon nanotubes （MWCNTs） modified glassy carbon electrode （GCE）. OP was directly oxidized on the MWCNTs/GCE, and the electrochemical oxidation mechanism was demonstrated by a one-electron and one-proton process in the reaction. The oxidation peak current of OP was significantly enhanced by the use of MWCNTs/GCE compared with those of bare glassy carbon electrode, suggesting that the modified electrode can remarkably improve the performance for OP determination. Factors influencing the detection processes were optimized. Under these optimal conditions, a linear relationship between concentration of OP and current response was obtained in the range of 5 × 10-8 to 1× 10-5 mol/L with a detection limit of 1.5 × 10-8 mol/L and correlation coefficient 0.9986. The modified electrode showed good selectivity, sensitivity, reproducibility and high stability.

关键词： multi-walled carbon nanotubes 4-n-octylphenol electrochemical analysis linear sweep voltammetry

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Highly sensitive and dynamically stable strain sensors based on porous-designed Fe nanowires/multi-walled carbon nanotubes with stable bi-conducting networks

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Science China(Technological Sciences) 2022年第12期65卷 2990-2999页

作者： YANG PingAn LIU ZhongBang LUO JiuFei LI Rui LU Yi HUANG Xin ZHANG Qiang ZHOU ZhiHao School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Advanced Manufacturing Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China College of Engineering and Technology Zunyi Normal CollegeZunyi 563006China

Flexible sensors for high strain sensitivity and dynamic stability are important for the development of human-interactive and health-monitoring ***,establishing a stable conductive network with low-conductivity material filling that can resist tensile strain failure and achieve high device performance still faces significant ***,a highly stretchable and sensitive strain sensor with strong dynamic stability and low conductive materials filling was fabricated based on highly conductive multi-walled carbon nanotubes(MWCNTs)and Fe nanowires(NWs)to construct a porous-designed bi-conducting network using a salt sacrificial template *** porous-designed Fe NW/MWCNT strain sensor(PFMS)with low material filling(3.6 wt.%Fe NWs and 10.6 wt.%MWCNTs)showed high sensitivity with a gauge factor(GF)of 134.98(strain range 0–22%)and 569.37(strain range 22%–60%),which is much higher compared with the pure MWCNT strain sensor with a GF of *** is attributed to the significant change in the contact area and contact resistance of the Fe NW/MWCNT bi-conducting network during tensile *** addition,the PFMS exhibited high repetitive stability over 2000 stretching-releasing *** attached to the human body,the PFMS functions as a health-monitoring device,that can accurately distinguish human motions such as the bending of fingers,knees,and ***,the proposed strategy pens a novel avenue for constructing porous conductive networks using polymer composites and is highly competitive for developing high-performance strain sensors.

关键词： flexible strain sensor multi-walled carbon nanotubes Fe nanowires porous structure

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