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Carbon nanotubes

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https://www.readbyqxmd.com/read/28934663/using-a-fluorescence-quenching-method-to-detect-dna-adsorption-onto-single-walled-carbon-nanotube-surfaces
#1
Kazuo Umemura, Shizuma Sato, Gilbert Bustamante, Jing Yong Ye
Surface modification of single-walled carbon nanotubes (SWNTs) with DNA molecules has attracted much attention in recent years to increase SWNT solubility and make various SWNT-based nanobiodevices. Therefore, there is a critical need to quantify the interaction between DNA molecules and SWNT surfaces, particularly the intermediate structures during DNA adsorption. In this study, we demonstrate the ability to detect the adsorption of DNA oligomers on SWNT surfaces by fluorescence spectroscopy. Fluorescein-labelled, 30mer, thymine oligonucleotides (F-T30) were employed as a fluorescent probe to study the interaction of DNA with SWNTs...
September 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28934220/prediction-of-thermal-conductivity-of-polyvinylpyrrolidone-pvp-electrospun-nanocomposite-fibers-using-artificial-neural-network-and-prey-predator-algorithm
#2
Waseem S Khan, Nawaf N Hamadneh, Waqar A Khan
In this study, multilayer perception neural network (MLPNN) was employed to predict thermal conductivity of PVP electrospun nanocomposite fibers with multiwalled carbon nanotubes (MWCNTs) and Nickel Zinc ferrites [(Ni0.6Zn0.4) Fe2O4]. This is the second attempt on the application of MLPNN with prey predator algorithm for the prediction of thermal conductivity of PVP electrospun nanocomposite fibers. The prey predator algorithm was used to train the neural networks to find the best models. The best models have the minimal of sum squared error between the experimental testing data and the corresponding models results...
2017: PloS One
https://www.readbyqxmd.com/read/28934141/facile-synthesis-of-zno-nanoparticles-on-nitrogen-doped-carbon-nanotubes-as-high-performance-anode-material-for-lithium-ion-batteries
#3
Haipeng Li, Zhengjun Liu, Shuang Yang, Yan Zhao, Yuting Feng, Zhumabay Bakenov, Chengwei Zhang, Fuxing Yin
ZnO/nitrogen-doped carbon nanotube (ZnO/NCNT) composite, prepared though a simple one-step sol-gel synthetic technique, has been explored for the first time as an anode material. The as-prepared ZnO/NCNT nanocomposite preserves a good dispersity and homogeneity of the ZnO nanoparticles (~6 nm) which deposited on the surface of NCNT. Transmission electron microscopy (TEM) reveals the formation of ZnO nanoparticles with an average size of 6 nm homogeneously deposited on the surface of NCNT. ZnO/NCNT composite, when evaluated as an anode for lithium-ion batteries (LIBs), exhibits remarkably enhanced cycling ability and rate capability compared with the ZnO/CNT counterpart...
September 21, 2017: Materials
https://www.readbyqxmd.com/read/28933721/flexible-carbon-nanotube-modified-separator-for-high-performance-lithium-sulfur-batteries
#4
Bin Liu, Xiaomeng Wu, Shan Wang, Zhen Tang, Quanling Yang, Guo-Hua Hu, Chuanxi Xiong
Lithium-sulfur (Li-S) batteries have become promising candidates for electrical energy storage systems due to their high theoretical specific energy density, low cost and environmental friendliness. However, there are some technical obstacles of lithium-sulfur batteries to be addressed, such as the shuttle effect of polysulfides. Here, we introduced organically modified carbon nanotubes (CNTs) as a coating layer for the separator to optimize structure and enhance the performance of the Li-S battery. The results showed that the cell with a CNTs-coated separator exhibited an excellent cycling performance...
July 26, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28933549/size-regulation-and-stability-enhancement-of-pt-nanoparticle-catalyst-via-polypyrrole-functionalization-of-carbon-nanotube-supported-pt-tetranuclear-complex
#5
Satoshi Muratsugu, Shota Miyamoto, Kana Sakamoto, Kentaro Ichihashi, Chang Kyu Kim, Nozomu Ishiguro, Mizuki Tada
A novel multiwall carbon nanotube (MWCNT) and polypyrrole (PPy) composite was found to be useful for preparing durable Pt nanoparticle catalysts of highly regulated sizes. A new pyrene-functionalized Pt4 complex was attached to the MWCNT surface which was functionalized with PPy matrix to yield Pt4 complex/PPy/MWCNT composites without decomposition of the Pt4 complex units. The attached Pt4 complexes in the composite were transformed into Pt(0) nanoparticles with sizes of 1.0-1.3 nm at a Pt loading range of 2 to 4 wt %...
September 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28933472/gas-adsorption-capacity-in-an-all-carbon-nanomaterial-composed-of-carbon-nanohorns-and-vertically-aligned-carbon-nanotubes
#6
Divya Puthusseri, Deepu J Babu, Sherif Okeil, Jörg J Schneider
Whereas vertically aligned carbon nanotubes (VACNTs) typically show a promising adsorption behavior at high pressures, carbon nanohorns (CNHs) exhibit superior gas adsorption properties in the low pressure regime due to their inherent microporosity. These adsorption characteristics are further enhanced when both materials are opened at their tips. The so prepared composite material allows one to investigate the effect of physical entrapment of CO2 molecules within the specific adsorption sites of VACNTs composed of opened double walled carbon nanotubes (CNTs) and in specific adsorption sites created by spherically aggregated opened single walled carbon nanohorns...
September 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28931933/buckling-structured-stretchable-pseudocapacitor-yarn
#7
Duck Weon Lee, Jung Han Lee, Nam Ki Min, Joon-Hyung Jin
Cable-type stretchable electrochemical pseudocapacitors based on multi-walled carbon nanotube (MWCNT) sheets and two different metal oxide nanopowders (NP), i.e., MnO2 and RuO2 are developed using a newly-devised dry painting method to mechanically fix the NP to the elastic rubber-based MWCNT electrode substrate, resulting in a porous buckling structured pseudocapacitor yarn. Highly stretchable stylene-ethylene/butylene-stylene (SEBS) is used as the supporting elastomeric core for wrapping with the MWCNT sheets and the electroactive NP...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931875/ultrasensitive-nano-rt-ipcr-for-determination-of-polybrominated-diphenyl-ethers-in-natural-samples
#8
Xiaohan Zhang, Xianyin Ping, Huisheng Zhuang
Extensive polybrominated diphenyl ethers (PBDEs) use has resulted in its increasingly widespread presence in the environment. PBDEs release from existing products can still persist and accumulate in the environment as well as in human and wildlife magnifying through the food web. Due to its ultra-trace amount in the environment, a novel ultrasensitive nano-rt-iPCR assay has been developed to determine polybrominated diphenyl ethers in natural samples. Numerous amino-DNA and polyclonal antibody (anti-PBDE) were immobilized onto the single-walled carbon nanotubes (SWCNTs) to form antibody-SWCNTs-DNA signal amplifier used in the proposed immunoassay system...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28930637/sodium-hypochlorite-and-sodium-bromide-individualized-and-stabilized-carbon-nanotubes-in-water
#9
Xuezhu Xu, Jian Zhou, Veronica Colombo, Yangyang Xin, Ran Tao, Gilles Lubineau
Aggregation is a major problem for hydrophobic carbon nanomaterials such as carbon nanotubes (CNTs) in water because it reduces the effective particle concentrations, prevents particles from entering the medium and leads to unstable electronic device performances when a colloidal solution is used. Molecular ligands such as surfactants can help the particles to disperse, but they tend to degrade the electrical properties of CNTs. Therefore, self-dispersed particles without the need for surfactant are highly desirable...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28930446/probing-coordination-complexes-by-carbon-nanotube-assisted-low-voltage-paper-spray-ionization-mass-spectrometry
#10
Rahul Narayanan, Thalappil Pradeep
Fragile transition metal complex ions such as [Cr(H2O)4Cl2]+, difficult to be observed by gas phase spectroscopy, are detected easily with carbon nanotube (CNT) assisted low voltage ambient ionization mass spectrometry. Observation of various substituted ions with D2O and ROH (R = CH3, C2H5…) established the versatility of the technique in detecting diverse species. Ligand substitution occurring in solution was captured by the low voltage technique. Extreme softness of the technique coupled with nanoscale ion sources enabled the creation of such species...
September 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28930102/confirming-the-key-role-of-ar-ion-bombardment-in-growth-feature-of-nanostructured-carbon-materials-by-pecvd
#11
Yulin Liu, Jinghuang Lin, Henan Jia, Shulin Chen, J Qi, Chaoqun Qu, Jian Cao, Jicai Feng, Weidong Fei
In order to confirm the key role of plasma etching in growth feature of nanostructured carbon materials (NCMs), here we reported a novel strategy to in-situ create different states of plasma etching conditions in plasma enhanced chemical vapor deposition (PECVD) by separating catalyst film from substrate. Different plasma-related environments on either side of the catalyst film were created simultaneously for achieving multi-layered structural NCMs. Results showed that plasma etching is observed crucial and complex for the growth of NCMs...
September 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28930097/dipole-switch-induced-modification-of-the-emissive-response-of-carbon-nanotubes
#12
Mareen Gläske, Pascal Bluemmel, Sabrina Juergensen, Antonio Setaro, Stephanie Reich
The interaction of carbon nanotubes with the molecular dipole switch spiropyran is expected to affect the optical response of the tubes. Until now, the need of anchor groups to immobilize the switches on the tubes has hindered experimental observation of effects of switching on the emission behavior of the tubes. Here we present spiropyran-carbon nanotubes complexes obtained by micelle swelling. This method does not require any anchor nor sophisticated chemistry to warrant close tube-switch proximity. For the first time we observe the shifts predicted theoretically and their effect on the tubes' excitation and emission energies...
September 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28929108/different-cellular-response-of-human-mesothelial-cell-met-5a-to-short-term-and-long-term-multiwalled-carbon-nanotubes-exposure
#13
Li Ju, Wei Wu, Min Yu, Jianlin Lou, Hao Wu, Xianhong Yin, Zhenyu Jia, Yun Xiao, Lijin Zhu, Jun Yang
Despite being a commercially important product, multiwalled carbon nanotubes (MWCNTs) continue to raise concerns over human health due to their structural similarity to asbestos. Indeed, exposure to MWCNT has been shown to induce lung cancer and even mesothelioma, but contradictory results also exist. To clarify the potentially carcinogenic effects of rigid and rod-like MWCNT and to elucidate the underlying mechanisms, the effects of MWCNT on human mesothelial cell MeT-5A were examined throughout 3 months of continuous exposure, including cytotoxicity, genotoxicity, and cell motility...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28928402/core-shell-heterostructured-multiwalled-carbon-nanotubes-reduced-graphene-oxide-nanoribbons-chitosan-a-robust-nanobiocomposite-for-enzymatic-biosensing-of-hydrogen-peroxide-and-nitrite
#14
Veerappan Mani, Mani Govindasamy, Shen-Ming Chen, Tse-Wei Chen, Annamalai Senthil Kumar, Sheng-Tung Huang
A robust nanobiocomposite based on core-shell heterostructured multiwalled carbon nanotubes@reduced graphene oxide nanoribbons (MWCNTs@rGONRs)/chitosan (CHIT) was described for the fabrication of sensitive, selective, reproducible and durable biosensor for hydrogen peroxide (H2O2) and nitrite (NO2(-)). The excellent physicochemical properties of MWCNTs@rGONRs such as, presence of abundant oxygen functionalities, higher area-normalized edge-plane structures and chemically active sites in combination with excellent biocompatibility of CHIT resulting in the versatile immobilization matrix for myoglobin (Mb)...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28926252/absolute-enantiomeric-excess-determination-of-carbon-nanotubes-ensemble-by-symmetry-breaking-using-optical-titration-method
#15
Jinsook Sim, Somin Kim, Myungsu Jang, Minsuk Park, Hyunkyu Oh, Sang-Yong Ju
Symmetry breaking of single-walled carbon nanotubes (SWNTs) has profound effects on their optoelectronic properties which are essential for fundamental study and applications. Here, we show that isomeric SWNT which exhibit identical photoluminescence (PL) undergo symmetry breaking by flavin mononucleotide (FMN) and exhibits dual PLs and different binding affinity (Ka). Increasing FMN concentration leads to systematic PL shifts of SWNT according to structural modality and handedness due to symmetry breaking...
September 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28926229/in-situ-derived-nixfe1-xooh-nife-nixfe1-xooh-nanotube-arrays-from-nife-alloys-as-efficient-electrocatalysts-for-oxygen-evolution
#16
An-Liang Wang, Yu-Tao Dong, Mei Li, Chaolun Liang, Gao-Ren Li
Herein, NixFe1-xOOH/NiFe/NixFe1-xOOH sandwich-structured nanotube arrays (SNTAs) supported on carbon fiber cloth (CFC) (NixFe1-xOOH/NiFe/NixFe1-xOOH SNTAs-CFC) have been developed as flexible high-performance OER catalysts by a facile in-situ electrochemical oxidation of NiFe metallic alloy nanotube arrays (ANTAs) during oxygen evolution process. Benefiting from the advantages of high conductivity, hollow nanotube array and porous strucuture, NixFe1-xOOH/NiFe/NixFe1-xOOH SNTAs-CFC exhibited a low overpotential of ~220 mV at the current density of 10 mA cm-2 and a small Tafel slope of 52 mV dec-1 in alkaline solution, which both are smaller than those of most OER electrocatalysts...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925924/in-situ-preparation-of-fe-sub-3-sub-o-sub-4-sub-in-a-carbon-hybrid-of-graphene-nanoscrolls-and-carbon-nanotubes-as-high-performance-anode-material-for-lithium-ion-batteries
#17
Yuewen Liu, Ahmad Hassan Siddique, Heran Huang, Qile Fang, Wei Deng, Xufeng Zhou, Huanming Lu, Z P Liu
A new conductive carbon hybrid combining both graphene nanoscrolls and carbon nanotubes (rGNSs-CNTs) is prepared, and used to host Fe3O4 nanoparticles through an in situ synthesis method. As an anode material for LIBs, the obtained Fe3O4@rGNSs-CNTs shows good electrochemical performance. At a current density of 0.1 A g-1, the anode material shows a high reversible capacity of 1232.9 mAh g-1 after 100 cycles. Even at a current density of 1 A g-1, it still achieves a high reversible capacity of 812.3 mAh g-1 after 200 cycles...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925684/carbon-nanotube-based-ion-selective-sensors-for-wearable-applications
#18
Soumyendu Roy, Moshe David-Pur, Yael Hanein
Wearable electronics offer new opportunities in a wide range of applications, especially sweat analysis using skin sensors. A fundamental challenge in these applications is the formation of sensitive and stable electrodes. In this article we report the development of a wearable sensor based on carbon nanotube (CNT) electrode arrays for sweat sensing. Solid-state ion selective electrodes (ISEs), sensitive to Na+ ions, were prepared by drop coating plasticized poly-vinyl chloride (PVC) doped with ionophore and ion exchanger on CNT electrodes...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925265/janus-electrochemistry-asymmetric-functionalization-in-one-step
#19
David Ibañez, Elisa Vallés, Elvira Gómez, Alvaro Colina, Aranzazu Heras
Janus structures represent an overwhelming member of materials with adaptable chemical and physical properties. The development of new synthesis routes has allowed the fabrication of Janus architectures with specific characteristics depending on the final applications. In the case of the membranes, the improvement of wet routes has been limited to the capillary effect, in which the solution can gradually penetrate through the membrane avoiding a double modification, different at each face of the membrane. In this work, we propose a new electrochemical methodology to circumvent the capillary limitation and to obtain a double electrochemical functionalization in only one step in a controlled way...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28924348/single-walled-carbon-nanotubes-ciprofloxacin-nanoantibiotic-strategy-to-improve-ciprofloxacin-antibacterial-activity
#20
Mohyeddin Assali, Abdel Naser Zaid, Farah Abdallah, Motasem Almasri, Rasha Khayyat
As infectious diseases continue to be one of the greatest health challenges worldwide, the demand toward alternative agents is continuously increasing. Recent advancement in nanotechnology has expanded our ability to design and construct nanomaterials to treat bacterial infections. Carbon nanotubes are one among these nanomaterials. Herein, we describe the covalent functionalization of the single-walled carbon nanotubes (SWCNTs) with multiple molecules of ciprofloxacin. The prepared nanoantibiotics were characterized using different techniques, including transmission electron microscopy, Raman spectroscopy, and thermogravimetric analysis...
2017: International Journal of Nanomedicine
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