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Qiangmin Yu, Chuxin Wu, Lunhui Guan
We report an efficient method for enriching high-purity metallic single-walled carbon nanotubes (m-SWCNTs) by using NO2 as oxidant to remove semiconducting components at 220°C. After etching, the m-SWCNTs with purity higher than 90% were obtained. The surviving m-SWCNTs remain intact structure, without any extra defects on their surface.
October 25, 2016: Journal of Physical Chemistry Letters
Filipa R Fernandes Simoes, Nitin Kumar Batra, Bashir H Warsama, Christian G Canlas, Shashikant Pandurang Patole, Tahir F Yapici, Pedro M F J Costa
Inductively coupled plasma optical emission spectroscopy (ICP-OES) is a common, relatively low cost and straightforward analytical technique for the study of trace quantities of metals in solid materials but its applicability to nanocarbons (e.g. graphene and nanotubes) has suffered from the lack of efficient digestion steps and certified reference materials (CRM). Here, various commercial and certified graphitic carbon materials were subjected to a "two-steps" microwave-assisted acid digestion procedure and the concentration of up to 18 elements was analysed by ICP-OES...
October 25, 2016: Analytical Chemistry
Jangheon Kim, Janghyeon Lee, Soohyun Kim, Wonsuk Jung
We generate networks and carbonization between individualized single-walled carbon nanotubes (SWCNTs) by an optimized plasmonic heating process using a halogen lamp to improve electrical properties for flow-induced energy harvesting. These properties were characterized by Raman spectra, a field-emission-scanning probe, transmission electron microscopy, atomic force microscopy and thermo-graphic camera. The electrical sheet resistance of carbonized SWCNTs was decreased to 2.71 , 2.5 times smaller than normal-SWCNTs...
October 25, 2016: ACS Applied Materials & Interfaces
Etienne Gaufrès, Nathalie Y-W Tang, Alexandre Favron, Charlotte Allard, François Lapointe, Vincent Jourdain, Said Tahir, Colin-Nadeau Brosseau, Richard Leonelli, Richard Martel
Liquid phase encapsulation of α-sexithiophene (6T) molecules inside individualized single-walled carbon nanotubes (SWCNTs) is investigated using Raman imaging and spectroscopy. By taking advantage of the strong Raman response of this system, we probe the encapsulation isotherms at 30°C and 115°C using a statistical ensemble of SWCNTs deposited on a Si/SiO2 substrate. Two distinct and sequential stages of encapsulation are observed: Stage 1 is a one-dimensional (1D) aggregation of 6T aligned head-to-tail inside the nanotube and stage 2 proceeds with the assembly of a second row, giving pairs of aligned 6Ts stacked together side-by-side...
October 25, 2016: ACS Nano
Arturo Carranza, María Guadalupe Pérez-García, Kunlin Song, George M Jeha, Zhenyu Diao, Rongying Jin, Nina Bogdanchikova, J Félix Armando Soltero, Mauricio Terrones, Qinglin Wu, John Anthony Pojman, Josue David Mota-Morales
We report an alternative green strategy based on deep-eutectic solvents (DES) to deliver multi-walled carbon nanotubes (MWCNTs) for a bottom-up approach that allowing the selective interfacial functionalization of nonaqueous poly(high internal phase emulsions), poly(HIPEs). The formation and polymerization of methacrylic and styrenic HIPEs were possible through the stabilization with nitrogen doped carbon nanotube (CNX) and surfactant mixtures using a urea-choline chloride DES as a delivering phase. Subtle changes in CNX concentration (less than 0...
October 25, 2016: ACS Applied Materials & Interfaces
Chengzhi Luo, Fangying Li, Delong Li, Qiang Fu, Chun-Xu Pan
Due to its unique hierarchical structure, natural spider silk features exceptional mechanical properties such as high tensile strength and great extensibility, making it one of the toughest materials. Herein, we design a bio-inspired spider silk single-walled carbon nanotubes (BISS-SWCNTs) that combine the hierarchical structure of spider silk and the high strength and conductivity of SWCNTs. To imitate the hierarchical structure, Fe nanoparticles are embedded on the surface of directly synthesized SWCNTs skeleton, and then followed by coating an amorphous carbon layer...
October 25, 2016: ACS Applied Materials & Interfaces
Wenyao Chen, Xuezhi Duan, Gang Qian, De Chen, Xinggui Zhou
No abstract text is available yet for this article.
October 20, 2016: ChemSusChem
Zohar A Arnon, Andreas Vitalis, Aviad Levin, Thomas C T Michaels, Amedeo Caflisch, Tuomas P J Knowles, Lihi Adler-Abramovich, Ehud Gazit
The dynamic nature of supramolecular polymers has a key role in their organization. Yet, the manipulation of their dimensions and polarity remains a challenge. Here, the minimalistic diphenylalanine building block was applied to demonstrate control of nano-assemblies growth and shrinkage using microfluidics. To fine-tune differential local environments, peptide nanotubes were confined by micron-scale pillars and subjected to monomer flows of various saturation levels to control assembly and disassembly. The small-volume device allows the rapid adjustment of conditions within the system...
October 25, 2016: Nature Communications
Svetlana A Chechetka, Motomichi Doi, Benoit P Pichon, Sylvie Bégin-Colin, Eijiro Miyako
Stimulating cells by light is an attractive technology to investigate cellular function and deliver innovative cell-based therapy. However, current techniques generally use poorly biopermeable light, which prevents broad applicability. Here, we show that a new type of composite nanomaterial, synthesized from multi-walled carbon nanotubes, magnetic iron nanoparticles, and polyglycerol, enables photothermal and mechanical control of Ca(2+) influx into cells overexpressing transient receptor potential vanilloid type-2...
November 25, 2016: Nanotechnology
Yutaka Maeda, Yuya Takehana, Jing-Shuang Dang, Mitsuaki Suzuki, Michio Yamada, Shigeru Nagase
Alkylated SWNTs were thermally treated to determine the influence of the substituents and the degree of functionalization on their thermal stability and photoluminescence (PL) properties. Alkylated SWNTs were prepared using sodium naphthalenide and alkyl bromide. The defunctionalization of alkylated SWNTs was monitored by absorption and Raman spectra. A selective recovery of the characteristic absorption and RBM peaks were observed during the thermal treatment, which indicates that the thermal stability of alkylated SWNTs decreased with an increase in SWNT diameter and with an increase in the degree of functionalization...
October 24, 2016: Chemistry: a European Journal
Huan Wang, Mayue Shi, Kai Zhu, Zongming Su, Xiaoliang Cheng, Yu Song, Xuexian Chen, Zhiqiang Liao, Min Zhang, Haixia Zhang
As the essential element of a triboelectric nanogenerator (TENG), friction layers play key roles that determine the device performance, which can be enhanced by material selection and surface modification. In this work, we have embedded aligned carbon nanotubes (CNTs) on the polydimethylsiloxane (PDMS) surface as the effective dielectric layer to donate electrons. This layer not only increases the electron generation for the output, but also shows notable stretchability. The length and the properties of the aligned CNTs can be controlled precisely...
October 25, 2016: Nanoscale
Yolanda Patiño, Sanaz Pilehvar, Eva Díaz, Salvador Ordóñez, Karolien De Wael
The aqueous phase electrochemical degradation of nalidixic acid (NAL) is studied in this work, using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) as instrumental techniques. The promotional effect of multi-walled carbon nanotubes (MWCNT) on the performance of glassy carbon electrodes is demonstrated, being observed that these materials catalyze the NAL reduction. The effect of surface functional groups on MWCNT -MWCNT-COOH and MWCNT-NH2-was also studied. The modification of glassy carbon electrode (GCE) with MWCNT leads to an improved performance for NAL reduction following the order of MWCNT>MWCNT-NH2>MWCNT-COOH...
October 13, 2016: Journal of Hazardous Materials
Ruoxi Wang, Dongju Zhang, Chengbu Liu
Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are highly toxic to humans and the environment. Developing efficient methods to detect or remove these pollutants is particularly important and urgent. Boron nitride nanotubes (BNNTs) with low dimension and high surface-to-volume ratio might be one of promising materials for the adsorption of PCDD/Fs. Here we present a density functional theory (DFT) study on the interaction of the pristine and Ni doped (8,0) single-walled BNNTs with 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), the most toxic congener among PCDD/F family...
October 21, 2016: Chemosphere
Ali E Aliev, Sahila Perananthan, John P Ferraris
Thermoacoustic performance of thin freestanding sheets of carbonized poly(acrylonitrile) and polybenzimidazole nanofibers are studied as promising candidates for thermophones. We analyze thermodynamic properties of sheets using transport parameters of single nanofibers and their aligned and randomly electrospun thin film assemblies. The electrical and thermal conductivities, thermal diffusivity, heat capacity, and infrared blackbody radiation are investigated to extract the heat exchange coefficient and enhance the energy conversion efficiency...
October 24, 2016: ACS Applied Materials & Interfaces
Richard A Boucher, Jürgen Bauch, Dietmar Wünsche, Gerhard Lackner, Anindya Majumder
X-ray detectors based on metal-oxide semiconductor field effect transistors couple instantaneous measurement with high accuracy. However, they only have a limited measurement lifetime because they undergo permanent degradation due to x-ray beam exposure. A field effect transistor based on carbon nanotubes (CNTs), however, overcomes this drawback of permanent degradation, because it can be reset into its starting state after being exposed to the x-ray beam. In this work the CNTs were deposited using a dielectrophoresis method on SiO2 coated p-type (boron-doped) Si substrates...
October 24, 2016: Nanotechnology
Ziwen Dai, Qi Gao, Man Ching Cheung, Hoi Man Leung, Terrence Chi Kong Lau, Hanadi F Sleiman, King Wai Chiu Lai, Pik Kwan Lo
We develop a versatile recognition system based on 3D triangular-shaped DNA nanotubes by integrating three different aptamer sequences along the three edges. This would allow multiple binding activities to be combined into a single system. The versatility of this nanotube platform can also provide a framework for spatial orientation and positioning of different aptamer-binding ligands in a 'pea-pod' architecture.
October 24, 2016: Nanoscale
Teng Wang, Yanru Guo, Zhenxing Zhou, Xinghua Chang, Jie Zheng, Xingguo Li
Developing noble-metal-free catalysts for electrochemical hydrogen evolution reactions (HER) with superior stability in acid is of critical importance for large-scale, low-cost hydrogen production from water electrolysis. Herein, we report a highly efficient and stable noble-metal-free HER catalyst, which is composed of Ni and Mo2C nanocrystals supported on N-doped graphite nanotubes. This catalyst shows very low overpotential (65 mV in 0.5 M H2SO4 at a current density of 10 mA cm(-2) with a Tafel plot of 67 mV/dec) and good stability for HER in acidic electrolyte, which is a promising noble-metal-free HER catalyst...
October 24, 2016: ACS Nano
Pavel Zelenovskiy, Igor Kornev, Semen Vasilev, Andrei Kholkin
The elastic properties of the nanotubes of self-assembled aromatic dipeptide diphenylalanine are investigated by means of Raman spectroscopy and a mass-in-mass 1D model. Analysis of nanotubes' lattice vibrations reveals the essential contribution of the water in the nanochannel core of the tubes to the Young's modulus and high water mobility along the channel. Direct measurements of the Young's modulus performed by nanoindentation confirm the obtained results.
October 24, 2016: Physical Chemistry Chemical Physics: PCCP
M Li, F Liu, X B Zhang, J P Cheng
A variety of carbon materials varying from 0D to 2D, i.e. 0D nanoparticles, 1D carbon nanotubes (CNTs) and 2D reduced graphene oxide (rGO) are selected to in situ combine with Ni-Mn layered double hydroxide (LDH) to prepare electrode materials for supercapacitors. Through a simple solution method, hierarchical Ni-Mn LDH/carbon composites can be easily fabricated. A comparative study is carried out on the sandwich-like LDH/rGO, flower-like LDH/carbon black, turbostratic-structured LDH/CNTs and ternary LDH/CNTs/rGO for their structure, morphology, porous properties and electrochemical performances...
October 24, 2016: Physical Chemistry Chemical Physics: PCCP
Anna Laura Capriotti, Chiara Cavaliere, Patrizia Foglia, Giorgia La Barbera, Roberto Samperi, Salvatore Ventura, Aldo Laganà
Recently, magnetic solid-phase extraction has gained interest because it presents various operational advantages over classical solid-phase extraction. Furthermore, magnetic nanoparticles are easy to prepare, and various materials can be used in their synthesis. In the literature, there are only few studies on the determination of mycoestrogens in milk, although their carryover in milk has occurred. In this work, we wanted to develop the first (to the best of our knowledge) magnetic solid-phase extraction protocol for six mycoestrogens from milk, followed by liquid chromatography and tandem mass spectrometry analysis...
October 24, 2016: Journal of Separation Science
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