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Synthesis of carbon nanostructures from coal by chemical solid synthesis method

MIcRO & NANO LETTERS 2016年第8期11卷 450-453页

作者： Fathabadi, Motahare Vakili Rafsanjani, Hasan Hashemipour Danafar, Firouze Shahid Bahonar Univ Dept Chem Engn Kerman Iran

carbon nanofibres (cNFs) and carbon spheres (cSs) are successfully synthesised using coal particles (<44 micron) in solid phase. coal and ferrocene as catalyst were fed to the reactor in the solid form. The reaction is carried out in a tubular reactor. The as-synthesised samples have been characterised through Raman spectroscopy, X-ray diffraction, scanning and transmission electron microscopy. The results show cNFs formed in 25-40 nm and mono dispersed cSs in 200-300 nm are amorphous. A feasible mechanism of cNFs and cSs formation from coal described here with the help of coal structure.

关键词： carbon fibres nanofibres catalysts Raman spectra X-ray diffraction scanning electron microscopy transmission electron microscopy amorphous state nanofabrication carbon nanostructures chemical solid synthesis method carbon nanofibres coal particles solid phase ferrocene catalyst tubular reactor Raman spectroscopy X-ray diffraction scanning electron microscopy transmission electron microscopy coal structure amorphous structure monodispersed carbon spheres c

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Molecular dynamics study of bio-manipulation in aqueous media

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MIcRO & NANO LETTERS 2016年第1期11卷 9-14页

作者： Kheirodin, Mohsen Pishkenari, Hossein Nejat Mahboobi, Seyed Hanif Sharif Univ Technol Sch Mech Engn Nano Robot Lab Tehran Iran Univ Calif Berkeley Dept Bioengn Berkeley CA 94720 USA

Nano-manipulation is one of the most important aspects of nano-robotics and nano-assembly. The positioning process is considered by many researches to be one of the most important parts of nano-assembly, but has been poorly investigated, particularly for biologic samples. This Letter is devoted to modelling the process of positioning a biomolecule with atomic force microscopy (AFM) in an aqueous media using molecular dynamics simulations. carbon nanotube (cNT) and graphite sheet are selected as AFM tip and substrate, respectively. To consider the effects of the medium on the manipulation, several models for decreasing the calculations including implicit, coarse grained, and all-atom methods have been investigated. They examined several parameters which may affect the quality of the manipulation process such as the cNT initial position with respect to the sample and substrate, its diameter and positioning strategies (pushing or pulling). The results demonstrate that despite of the implicit solvent methods, coarse-grained model can simulate the aqueous media accurately with lower computational cost. Furthermore, pulling method with a cNT which has a larger diameter and a smaller gap with respect to the substrate is the most appropriate setting for manipulation.

关键词： molecular dynamics method atomic force microscopy carbon nanotubes nanopositioning graphite biomanipulation aqueous media nanomanipulation nanorobotics nanoassembly atomic force microscopy molecular dynamics simulations carbon nanotube graphite sheet pushing pulling c

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Graphene-based THz modulator analysed by equivalent circuit model

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MIcRO & NANO LETTERS 2016年第8期11卷 439-442页

作者： Xiao, Binggang chen, Jing Xie, Zhiyi Xiao, Sanshui Ji Liang Univ China Coll Informat Engn Hangzhou 310018 Zhejiang Peoples R China Tech Univ Denmark Dept Photon Engn DK-2800 Lyngby Denmark

A terahertz (THz) modulator based on graphene is proposed and analysed by use of equivalent transmission line of a homogeneous medium and the local anisotropic model of the graphene conductivity. The result calculated by the equivalent circuit is consistent with that obtained by Fresnel transfer matrices. For the modulator proposed here, when the frequency of carrier wave is 0.6 THz, the theoretical analysis indicates that the modulation bandwidth is 55.5 kHz and the modulation depth is 81.3% for voltage change from 0 to 50 V.

关键词： terahertz wave devices equivalent circuits modulators graphene graphene based THz modulator equivalent circuit model equivalent transmission line graphene conductivity Fresnel transfer matrices bandwidth 55 5 kHz c

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Synergistic effects of graphene-polyaniline counter electrode in dye-sensitised solar cells

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MIcRO & NANO LETTERS 2016年第2期11卷 77-80页

作者： Loryuenyong, Vorrada Yaotrakool, Sajjarinee Prathumted, Pratya Lertsiri, Julaluck Buasri, Achanai Silpakorn Univ Fac Engn & Ind Technol Dept Mat Sci & Engn Nakonpathom 73000 Thailand Chulalongkorn Univ Ctr Excellence Petrochem & Mat Technol Bangkok 10330 Thailand

This research studied the preparation of polyaniline/graphene hybrid material as a counter electrode in dye-sensitised solar cells by drop casting onto fluorine-doped tin oxide glass slides. Scanning electron microscope measurement revealed the rough surface of the hybrid films. The results have also shown that 1:2 ratio of PANI/graphene hybrid counter electrode provided a synergy that offered a comparable conversion efficiency to that of conventional Pt electrode.

关键词： dye-sensitised solar cells electrochemical electrodes graphene organic-inorganic hybrid materials thin films casting scanning electron microscopy rough surfaces thin film devices conducting polymers graphene-polyaniline counter electrode synergistic effects dye-sensitised solar cells polyaniline-graphene hybrid material drop casting fluorine-doped tin oxide glass slides scanning electron microscopy rough surface hybrid films conversion efficiency c SnO2:F

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Single-wall and multi-wall carbon nanotubes promote rice root growth by eliciting the similar molecular pathways and epigenetic regulation

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IET NANOBIOTEcHNOLOGY 2016年第4期10卷 222-229页

作者： Yan, Shihan Zhang, Hao Huang, Yan Tan, Junjun Wang, Pu Wang, Yapei Hou, Haoli Huang, Jin Li, Lijia Wuhan Univ Coll Life Sci State Key Lab Hybrid Rice Wuhan 430072 Peoples R China Chinese Acad Sci Chongqing Inst Green & Intelligent Technol Chongqing Key Lab Multiscale Mfg Technol Chongqing 400714 Peoples R China Wuchang Univ Technol Sch Life Sci Synergy Innovat Ctr Biol Peptide Antidiabet Hubei Wuhan 430223 Peoples R China Wuhan Univ Technol Coll Chem Engn Wuhan 430070 Peoples R China Southwest Univ Sch Chem & Chem Engn 2 Tiansheng Rd Chongqing 400715 Peoples R China

Organisms are constantly exposed to environmental stimuli and have evolved mechanisms of protection and adaptation. Various effects of nanoparticles (NPs) on crops have been described and some results confirm that NPs could enhance plant growth at the physiological and genetic levels. This study comparatively analysed the effect of carbon nanotubes (cNTs) on rice growth. The results showed that single-wall cNTs were located in the intercellular space while multi-wall cNTs penetrated cell walls in roots. cNTs could promote rice root growth through the regulation of expression of the root growth related genes and elevated global histone acetylation in rice root meristem zones. These responses were returned to normal levels after cNTs were removed from medium. cNTs caused the similar histone acetylation and methylation statuses across the local promoter region of the cullin-RING ligases 1 (cRL1) gene and increased micrococcal nuclease accessibility of this region, which enhanced this gene expression. The authors results suggested that cNTs could cause plant responses at the cellular, genetic, and epigenetic levels and these responses were independent on interaction modes between root cells and cNTs.

关键词： crops multi-wall carbon nanotubes single-wall carbon nanotubes nanobiotechnology cellular biophysics genetics enzymes biochemistry molecular biophysics single-wall carbon nanotubes multiwall carbon nanotubes rice root growth molecular pathways epigenetic regulation environmental stimuli crops intercellular space cell walls global histone acetylation rice root meristem zones histone acetylation methylation statuses local promoter region cRL1 gene micrococcal nuclease accessibility root growth related gene expression plant responses cellular levels epigenetic levels genetic levels interaction modes c

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Highly compression-tolerant folded carbon nanotube/paper as solid-state supercapacitor electrode

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MIcRO & NANO LETTERS 2016年第10期11卷 586-590页

作者： Song, Yu cheng, Xiaoliang chen, Haotian Han, Mengdi chen, Xuexian Huang, Jiahuan Su, Zongming Zhang, Haixia Peking Univ Inst Microelect Natl Key Lab Sci & Technol Micro Nano Fabricat Beijing 100871 Peoples R China Peking Univ Acad Adv Interdisciplinary Studies Beijing 100871 Peoples R China

An original highly compression-tolerant folded carbon nanotube (cNT)/paper electrode, which could be assembled into compressible solid-state supercapacitor with polyvinyl alcohol/phosphoric acid gel electrolyte, is designed. It is worth mentioning that both the compression-tolerant ability of the folded structure and the strain ability of the cNT electrode are conducive to achieving the compressible supercapacitor. Such device could withstand pressure and shape-changing, which has great potential to be used in various environments. This compressible solid-state supercapacitor also owns the maximum specific capacitance of 11.07 mF/cm(2), and capacitance retention retains more than 90% after 100 cycling times. Furthermore, the stability performance of the device is also discussed which is almost steady under 50% strain state. When two devices are connected in serial and fully charged, this power unit could light up a red light emitting diode continuously even under the compression state. Therefore, this device performs as a promising candidate to be compatible with other compression-tolerant electronics and enlightens a broad field of compressible energy storage and self-powered systems.

关键词： carbon nanotubes supercapacitors electrochemical electrodes electrolytes capacitance highly compression-tolerant folded carbon nanotube-paper solid-state supercapacitor electrode compressible solid-state supercapacitor polyvinyl alcohol-phosphoric acid gel electrolyte strain ability maximum specific capacitance capacitance retention stability performance power unit red light emitting diode compression-tolerant electronics compressible energy storage self-powered systems c

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二苯乙烯苷对神经细胞淀粉样肽前体蛋白表达的影响及其与cREB调节相关的作用机制

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首都医科大学学报 2017年第6期38卷 835-840页

作者：尹晓敏徐婷戴伍飞钱嘉逸陈晨张兰李林首都医科大学宣武医院药物研究室北京市神经药物工程技术研究中心北京100053 南通大学医学院生物化学与分子生物学系江苏南通226001

目的探讨二苯乙烯苷(tetrahydroxystilbene glucoside,TSG)对培养神经细胞淀粉样肽前体蛋白(amyloid precursor protein,APP)表达的影响及其作用机制。方法应用Western blotting法检测APP和c AMP效应元件结合蛋白(c AMP responsive element-binding protein,cREB)的表达。用Matinspector软件分析APP启动子区cRE顺式反应元件;构建不同长度APP启动子区荧光素酶表达质粒;用双荧光素酶报告基因系统检测细胞中荧光素酶活性。结果由Forskolin激活SH-SY5Y细胞中cREB的同时可下调APP表达,成功构建了含有cRE元件的APP启动子区荧光素酶表达质粒。TSG能够抑制SH-SY5Y细胞内APP表达,并对APP启动子转染细胞内含有cRE1和2的APP荧光素酶报告基因质粒表达有显著抑制作用。结论 TSG能够下调神经细胞中APP的表达,其机制可能与影响cREB与cRE元件的结合有关。

关键词：二苯乙烯苷淀粉样肽前体蛋白 c AMP效应元件结合蛋白阿尔茨海默病

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Equivalent mechanical boundary conditions for single layer graphene sheets

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MIcRO & NANO LETTERS 2016年第5期11卷 248-252页

作者： Sadeghzadeh, Sadegh Iran Univ Sci & Technol Sch New Technol Tehran Iran

To describe and analyse mechanical structures due to external loads, equation of motion must be supplemented with appropriate boundary conditions. When nanomechanical structures (especially layered systems) are considered, satisfying the boundaries is more challenging. It may be essential to develop a specific methodology for any system in such scale and configuration. This work introduces a general approach for boundary conditions of monolayer graphene sheets as the most important part of future sensors and resonators in nanoelectromechanical systems. comparing with the experiments, it has been demonstrated that the graphene sheets on the adhesive surfaces should be assumed as a hinged edge condition and not as a clamped one. As a result, inaccuracy of the commonly used rigid base as a clamped condition is proven due to comparison with a reported experiment. It is suggested that a flexible substrate can be replaced to have better accordance. A flexible silicon base with equilibrium distance equal to s = 2.5 angstrom and depth of potential well equal to epsilon = 0.02 eV is obtained as the best substrate for a square graphene sheet under doubly clamped edge conditions.

关键词： graphene nanomechanics nanoelectromechanical devices monolayers equivalent mechanical boundary conditions external loads equation of motion nanomechanical structures nanoelectromechanical systems adhesive surfaces hinged edge condition flexible silicon base doubly clamped edge conditions monolayer graphene sheets distance 2 5 angstrom c Si

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Interdigitated transducer ammonia sensors based on nanodiamond/polyaniline thin film

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ELEcTRONIcS LETTERS 2016年第7期52卷 542-543页

作者： Wu, Zuquan chen, Xiangdong Tian, Xin chen, Xinpeng Li, Ning Ding, Xing Southwest Jiaotong Univ Sch Informat Sci & Technol Chengdu 610031 Sichuan Peoples R China Southwest Jiaotong Univ Sch Mat Sci & Engn Minist Educ Key Lab Adv Technol Mat Chengdu 610031 Sichuan Peoples R China

The interdigitated transducers sensor based on nanodiamond (ND)/polyaniline (PANI) thin film for ammonia (NH3) sensing is investigated, which is synthesised by in situ chemical oxidative polymerisation. The experimental result reveals that the response of 30ND/PANI thin film sensor is much higher than that of PANI for NH3 gas detection. The ND is homogeneously combined into PANI to form ND/PANI nanocomposite, which may increase the specific surface area and improve the response of ND/PANI sensor. Moreover, the response mechanism of ND/PANI for NH3 gas detection is discussed. The synthesised thin films are characterised by Fourier transform infrared spectroscopy and SEM.

关键词： Fourier transform infrared spectra ammonia conducting polymers diamond gas sensors nanosensors polymer films polymerisation c Fourier transform infrared spectroscopy NH3 SEM gas detection in situ chemical oxidative polymerisation interdigitated transducer ammonia sensors nanodiamond-polyaniline thin film

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小青龙汤合三子养亲汤治疗慢性支气管炎临床效果分析

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中文科技期刊数据库（全文版）医药卫生 2019年第4期 225-225,231页

作者：曾伟东广西钦州市钦南区犀牛脚中心卫生院广西钦州535035

对慢性支气管炎患者予以小青龙汤联合三子养亲汤治疗,以此分析小青龙汤联合三子养亲汤的临床效果。方法:选择慢性支气管炎患者200例,收治时间于2015年2月~2017年2月,行不同组别的差异性治疗方式:常规治疗、小青龙汤联合三子养亲汤治疗,... 详细信息

对慢性支气管炎患者予以小青龙汤联合三子养亲汤治疗,以此分析小青龙汤联合三子养亲汤的临床效果。方法:选择慢性支气管炎患者200例,收治时间于2015年2月~2017年2月,行不同组别的差异性治疗方式:常规治疗、小青龙汤联合三子养亲汤治疗,对应组别:对照组、研究组。对组间的临床治疗总有效率、c 反应蛋白和肿瘤坏死因子 –α指标进行对比。结果:研究组的临床治疗总有效率(98.00%)高于对照组(78.00%),且研究组的c 反应蛋白(4.44±2.11 mg/L)和肿瘤坏死因子 –α(40.12±13.33 U/mL)指标均低于对照组(c 反应蛋白和肿瘤坏死因子 –α指标分别为:8.67±2.11 mg/L、46.67±13.69 U/mL),P<0.05,有统计学差异。结论:小青龙汤联合三子养亲汤治疗慢性支气管炎患者的临床价值显著,可以改善患者的各项炎性指标。

关键词：慢性支气管炎小青龙汤三子养亲汤 c 反应蛋白

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