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https://www.readbyqxmd.com/read/28645765/chitosan-surface-modified-electrospun-poly-%C3%AE%C2%B5-caprolactone-carbon-nanotube-composite-fibers-with-enhanced-mechanical-cell-proliferation-and-antibacterial-properties
#1
Siyu Wang, Yumei Li, Rui Zhao, Toufeng Jin, Li Zhang, Xiang Li
The surface modification is one of the most effective methods to improve the bioactivity and cell affinity effect of electrospun poly(ε-caprolactone) (PCL) fibers. In the present study, chitosan (CS), a cationic polysaccharide, was used to modify the surface of electrospun PCL fibers. To obtain strong interaction between CS and PCL fibers, negatively charged PCL fibers were prepared by the incorporation of acid-treated carbon nanotubes (CNTs) into the fibers. In this way, the positively charged chitosan could be immobilized onto the surface of PCL fibers tightly by the electrostatic attraction...
June 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28642951/intermix-of-metal-nanoparticles-single-wall-carbon-nanotubes
#2
Feng Xu, Qin Lu, Lin Ye, S C Edman Tsang
Using physical mixtures of Pd/SWNTs (Pd nanoparticles on single-walled carbon nanotubes) and Pt/SWNTs, the composites show electro-catalytic properties comparable to the corresponding alloys: electron exchange readily occurs between the two metal nanoparticles via SWNT support at long ranges without direct atomic contact, which is responsible for the tunable alloy-like properties.
June 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28641554/future-of-spermatogonial-stem-cell-culture-application-of-nanofiber-scaffolds
#3
Azar Shams, Neda Eslahi, Mansoureh Movahedin, Fariborz Izadyar, Hamidreza Asgari, Morteza Koruji
The spermatogonial stem cells (SSCs) are unique in mammals because they can transmit genetic information from generation to generation and it is of significant importance. In testes, Sertoli cells, peritubular myoid cells, Leydig cells and other interstitial cells contribute to the spermatogonial stem cell "niche". So, creation of niche in in vitro condition that mimics in vivo environment is essential to maintain functional characteristic of SSCs. Nanofiber matrices mimic the architecture and size scale of the natural extracellular matrix (ECM)...
June 22, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28641430/water-flow-in-carbon-nanotubes-the-effect-of-tube-flexibility-and-thermostat
#4
Alan Sam, Sridhar Kumar Kannam, Remco Hartkamp, Sarith P Sathian
Although the importance of temperature control in nonequilibrium molecular dynamics simulations is widely accepted, the consequences of the thermostatting approach in the case of strongly confined fluids are underappreciated. We show the strong influence of the thermostatting method on the water transport in carbon nanotubes (CNTs) by considering simulations in which the system temperature is controlled via the walls or via the fluid. Streaming velocities and mass flow rates are found to depend on the tube flexibility and on the thermostatting algorithm, with flow rates up to 20% larger when the walls are flexible...
June 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28641011/exploiting-one-dimensional-exciton-phonon-coupling-for-tunable-and-efficient-single-photon-generation-with-a-carbon-nanotube
#5
Adrien Jeantet, Yannick Chassagneux, Théo Claude, Philippe Roussignol, Jean-Sébastien Lauret, Jakob Reichel, Christophe Voisin
Condensed-matter emitters offer enriched cavity quantum electrodynamical effects due to the coupling to external degrees of freedom. In the case of carbon nanotubes a very peculiar coupling between localized excitons and the one-dimensional acoustic phonon modes can be achieved, which gives rise to pronounced phonon wings in the luminescence spectrum. By coupling an individual nanotube to a tunable optical micro-cavity, we show that this peculiar exciton-phonon coupling is a valuable resource to enlarge the tuning range of the single-photon source while keeping an excellent exciton-photon coupling efficiency and spectral purity...
June 22, 2017: Nano Letters
https://www.readbyqxmd.com/read/28640435/adjusting-the-chemical-bonding-of-sno2-cnt-composite-for-enhanced-conversion-reaction-kinetics
#6
Yayi Cheng, Jianfeng Huang, Hui Qi, Liyun Cao, Jun Yang, Qiao Xi, Xiaomin Luo, Kazumichi Yanagisawa, Jiayin Li
Carbon nanotubes (CNTs) with excellent electron conductivity are widely used to improve the electrochemical performance of the SnO2 anode. However, the chemical bonding between SnO2 and CNTs is not clearly elucidated despite it may affect the lithiation/delithiation behavior greatly. In this work, an SnO2 @CNT composite with SnC and SnOC bonds as a linkage bridge is reported and the influence of the SnC and SnOC bonds on the lithium storage properties is revealed. It is found that the SnC bond can act as an ultrafast electron transfer path, facilitating the reversible conversion reaction between Sn and Li2 O to form SnO2 ...
June 22, 2017: Small
https://www.readbyqxmd.com/read/28639289/planar-polyolefin-nanostripes-perhydrogenated-graphene
#7
Daniel Bouša, Stepan Huber, David Sedmidubsky, Martin Pumera, Zdenek Sofer
Graphene hydrogenation gives an opportunity to introduce a band gap into the graphene electronic structure. Complete hydrogenation may lead to the graphane, a fully hydrogenated counterpart of graphene. However, pure graphane has not been successfully prepared to this day. Here we show that hydrogenation of single walled carbon nanotubes by means of Birch reduction could lead to graphane based carbon nanostripes with uniform dimensions. Such a material exhibits interesting electrocatalytic and magnetic properties as well huge potential for hydrogen storage since the weight concentration of hydrogen is 8...
June 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28638174/near-real-time-measurement-of-carbonaceous-aerosol-using-microplasma-spectroscopy-application-to-measurement-of-carbon-nanomaterials
#8
Lina Zheng, Pramod Kulkarni, M Eileen Birch, Gregory Deye, Dionysios D Dionysiou
A sensitive, field-portable microplasma spectroscopy method has been developed for real-time measurement of carbon nanomaterials. The method involves microconcentration of aerosol on a microelectrode tip for subsequent analysis for atomic carbon using laser-induced breakdown spectroscopy (LIBS) or spark emission spectroscopy (SES). The spark-induced microplasma was characterized by measuring the excitation temperature (15,000 - 35,000 K), electron density (1.0 × 10(17) - 2.2 × 10(17) cm(-3)), and spectral responses as functions of time and interelectrode distance...
August 18, 2016: Aerosol Science and Technology: the Journal of the American Association for Aerosol Research
https://www.readbyqxmd.com/read/28636819/superelastic-pseudocapacitors-from-freestanding-mno2-decorated-graphene-coated-carbon-nanotube-aerogels
#9
Yepin Zhao, Maxwell Patrick Li, Siyuan Liu, Mohammad F Islam
In recent years, the demand for emerging electronic devices has driven efforts to develop electrochemical capacitors with high power and energy densities that can preserve capacitance under and after recovery from mechanical deformation. We have developed superelastic pseudocapacitors using ≈ 1.5 mm thick graphene-coated single-walled carbon nanotube (SWCNT) aerogels decorated with manganese oxide (MnO2) as freestanding electrodes that retain high volumetric capacitance and electrochemical stability before, under, and after recovery from 50% compression...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636565/porous-carbon-nanotubes-decorated-carbon-nanofibers-with-effective-microwave-absorption-property
#10
Tao Zhang, Bo Xiao, Pengyu Zhou, Long Xia, Guangwu Wen, Haibin Zhang
Carbon nanofibers decorated with porous carbon nanotubes have been prepared by electrospinning and annealing methods. Microwave reflection loss of the products is investigated in the frequency range of 2-18 GHz. The bandwidth with a reflection loss less than -10 dB covers a wide frequency ranging from 7.0 to 14.1 GHz with the thickness of 3.0-5.5 mm, and the minimum reflection loss is -44.5 dB at 10.7 GHz with a thickness of 2.0 mm. The large reflection loss and wide reflection band reveals that the products could be a promising candidate for microwave absorption...
June 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28636322/spirally-structured-conductive-composites-for-highly-stretchable-robust-conductors-and-sensors
#11
Xiaodong Wu, Yangyang Han, Xinxing Zhang, Canhui Lu
Flexible and stretchable electronics are highly desirable for next generation devices. However, stretchability and conductivity are fundamentally difficult to combine for conventional conductive composites, which restricts their widespread applications especially as stretchable electronics. Here, we innovatively develop a new class of highly stretchable and robust conductive composites via a simple and scalable structural approach. Briefly, carbon nanotubes are spray-coated onto a self-adhesive rubber film, followed by rolling up the film completely to create a spirally layered structure within the composites...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636314/giant-thermal-rectification-from-single-carbon-nanotube-graphene-junction
#12
Xueming Yang, Dapeng Yu, Bingyang Cao
We describe the influence of the geometry parameters on the thermal rectification of single carbon nanotube-graphene junction. The two-dimensional (2D) distribution of the thermal rectification with respect to the tube length and the side length of the graphene nanosheet are calculated and visualized. The maximum thermal rectification ratios of the designed single carbon nanotube-graphene junction can reach 1244.1% and 1681.6% at average temperatures of 300 K and 200 K, respectively. These values are much higher than those reported for single-material nanostructure-based thermal rectifiers...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28636246/stretchable-electrochemical-sensor-for-inducing-and-monitoring-cell-mechanotransduction-in-real-time
#13
Yan-Ling Liu, Yu Qin, Zi-He Jin, Xue-Bo Hu, Miao-Miao Chen, Rong Liu, Christian Amatore, Wei-Hua Huang
Existing methods offer little direct and real-time information about stretch-triggered biochemical responses during cell mechanotransduction. Herein, we report a novel stretchable electrochemical sensor that takes advantage of a hierarchical percolation network of carbon nanotubes and gold nanotubes (CNTs- Au NTs). This hybrid nano-structure provides the sensor with excellent time-reproducible mechanical and electrochemical performances while granting very good cellular compatibility, making it perfectly apt to induce and monitor simultaneously transient biochemical signals...
June 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28635068/selective-growth-of-metal-free-metallic-and-semiconducting-single-wall-carbon-nanotubes
#14
Lili Zhang, Dong-Ming Sun, Peng-Xiang Hou, Chang Liu, Tianyuan Liu, Jianfeng Wen, Nujiang Tang, Jian Luan, Chao Shi, Jin-Cheng Li, Hong-Tao Cong, Hui-Ming Cheng
A major obstacle for the use of single-wall carbon nanotubes (SWCNTs) in electronic devices is their mixture of different types of electrical conductivity that strongly depends on their helical structure. The existence of metal impurities as a residue of a metallic growth catalyst may also lower the performance of SWCNT-based devices. Here, it is shown that by using silicon oxide (SiOx ) nanoparticles as a catalyst, metal-free semiconducting and metallic SWCNTs can be selectively synthesized by the chemical vapor deposition of ethanol...
June 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28634847/carbon-nanotubes-embedded-in-embryoid-bodies-direct-cardiac-differentiation
#15
Samad Ahadian, Shukuyo Yamada, Mehdi Estili, Xiaobin Liang, Ramin Banan Sadeghian, Ken Nakajima, Hitoshi Shiku, Tomokazu Matsue, Ali Khademhosseini
We embedded carbon nanotubes (CNTs) in mouse embryoid bodies (EBs) for modulating mechanical and electrical cues of the stem cell niche. The CNTs increased the mechanical integrity and electrical conductivity of the EBs. Measured currents for the unmodified EBs (hereafter, EBs) and the EBs-0.25 mg/mL CNTs were 0.79 and 26.3 mA, respectively, at voltage of 5 V. The EBs had a Young's modulus of 20.9 ± 6.5 kPa, whereas the Young's modulus of the EB-0.1 mg/mL CNTs was 35.2 ± 5.6 kPa. The EB-CNTs also showed lower proliferation and greater differentiation rates compared with the EBs as determined by the expression of pluripotency genes and the analysis of EB sizes...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28631625/high-loading-fe2o3-swnt-composite-films-for-lithium-ion-battery-applications
#16
Ying Wang, Jiahui Guo, Li Li, Yali Ge, Baojun Li, Yingjiu Zhang, Yuanyuan Shang, Anyuan Cao
Single-walled carbon nanotube (SWNT) films are a potential candidate as porous conductive electrodes for energy conversion and storage; tailoring the loading and distribution of active materials grafted on SWNTs is critical for achieving maximum performance. Here, we show that as-synthesized SWNT samples containing residual Fe catalyst can be directly converted to Fe2O3/SWNT composite films by thermal annealing in air. The mass loading of Fe2O3 nanoparticles is tunable from 63 wt.% up to 96 wt.%, depending on the annealing temperature (from 450 C to 600 C), while maintaining the porous network structure...
June 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28631004/laser-structuring-of-carbon-nanotubes-in-the-albumin-matrix-for-the-creation-of-composite-biostructures
#17
Alexander Yu Gerasimenko, Olga E Glukhova, Georgy V Savostyanov, Vitaly M Podgaetsky
No abstract text is available yet for this article.
June 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28630927/welding-of-3d-printed-carbon-nanotube-polymer-composites-by-locally-induced-microwave-heating
#18
Charles B Sweeney, Blake A Lackey, Martin J Pospisil, Thomas C Achee, Victoria K Hicks, Aaron G Moran, Blake R Teipel, Mohammad A Saed, Micah J Green
Additive manufacturing through material extrusion, often termed three-dimensional (3D) printing, is a burgeoning method for manufacturing thermoplastic components. However, a key obstacle facing 3D-printed plastic parts in engineering applications is the weak weld between successive filament traces, which often leads to delamination and mechanical failure. This is the chief obstacle to the use of thermoplastic additive manufacturing. We report a novel concept for welding 3D-printed thermoplastic interfaces using intense localized heating of carbon nanotubes (CNTs) by microwave irradiation...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630162/real-time-dynamics-of-carbon-nanotube-porins-in-supported-lipid-membranes-visualized-by-high-speed-atomic-force-microscopy
#19
Yuliang Zhang, Ramya H Tunuguntla, Pyung-On Choi, Aleksandr Noy
In-plane mobility of proteins in lipid membranes is one of the fundamental mechanisms supporting biological functionality. Here we use high-speed atomic force microscopy (HS-AFM) to show that a novel type of biomimetic channel-carbon nanotube porins (CNTPs)-is also laterally mobile in supported lipid membranes, mimicking biological protein behaviour. HS-AFM can capture real-time dynamics of CNTP motion in the supported lipid bilayer membrane, build long-term trajectories of the CNTP motion and determine the diffusion coefficients associated with this motion...
August 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28629098/carbon-nanotube-ensembled-hybrid-nanocomposite-electrode-for-direct-electrochemical-detection-of-epinephrine-in-pharmaceutical-tablets-and-urine
#20
K Koteshwara Reddy, M Satyanarayana, K Yugender Goud, K Vengatajalabathy Gobi, Hern Kim
An efficient electrochemical sensor for selective detection of the neurotransmitter, epinephrine (Epn), has been fabricated with the aid of a functionalized multiwall carbon nanotube-chitosan biopolymer nanocomposite (Chit-fCNT) electrode. Multiwall carbon nanotubes (CNT) were successfully functionalized with the aid of nitric acid and confirmed by the Raman spectral data. Functionalized carbon nanotubes (fCNT) were dispersed in chitosan solution and the resulting bio-nanocomposite was used for the fabrication of sensor surface by drop and cast method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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