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Multiwall carbon nanotubes

Khairunnisa Amreen, Sivakumar Nisha, Annamalai Senthil Kumar
Direct sensing of uric acid (UA) in an undiluted whole blood sample is reported here taking human whole blood as an analyte and a self-supporting electrolyte. Among various solid electrodes (Pt, Au, GCE, and GCE/Nafion) and carbon nanomaterials (carbon nanofibers, graphene oxide, graphite nanopowder, graphitized mesoporous carbon (GMC), single-walled carbon nanotubes, and multiwalled carbon nanotubes) tested, a GMC-modified glassy carbon electrode, designated as GCE/GMC, showed a remarkable response towards direct electrochemical oxidation of blood uric acid at ∼0...
March 16, 2018: Analyst
Huu-Duc Nguyen-Tran, Van-Tho Hoang, Van-Ta Do, Doo-Man Chun, Young-Jin Yum
The development of lightweight automotive parts is an important issue for improving the efficiency of vehicles. Polymer composites have been widely applied to reduce weight and improve mechanical properties by mixing polymers with carbon fibers, glass fibers, and carbon nanotubes. Polypropylene (PP) has been added to carbon fiber-reinforced nylon-6 (CF/PA6) composite to achieve further weight reduction and water resistance. However, the mechanical properties were reduced by the addition of PP. In this research, multiwalled carbon nanotubes (CNTs) were added to compensate for the reduced mechanical properties experienced when adding PP...
March 15, 2018: Materials
Feriel Boussema, Andrew J Gross, Fatma Hmida, Brahim Ayed, Hatem Majdoub, Serge Cosnier, Abderrazak Maaref, Michael Holzinger
Two new inorganic-organic hybrid materials based on heteropolyoxometalates (POMs): (C4 H10 N)6 [P2 Mo18 O62 ]·4H2 O (P2 Mo18 ) and (C6 H8 NO)4 [H2 P2 W18 O62 ]·6H2 O (P2 W18 ) are reported as mediators for electron transfer between FAD-dependent glucose dehydrogenase (FAD-GDH) and a multiwalled carbon nanotube (MWCNT) matrix for glucose biofuel cell and biosensor applications. These polyoxometalates were chosen due to their promising redox behavior in a potential range for mediated electron transfer with the glucose oxidizing enzyme, FAD-GDH...
February 28, 2018: Biosensors & Bioelectronics
Zhuang Guo, Hongbin Cao, Yuxian Wang, Yongbing Xie, Jiadong Xiao, Jin Yang, Yi Zhang
Three kinds of graphitic carbon nitride materials (bulk, porous and nanosheet g-C3 N4 ) were composited with a multiwall carbon nanotube (MWCNT) by a hydrothermal method, and the obtained b-C3 N4 /CNT, p-C3 N4 /CNT and n-C3 N4 /CNT materials were used in the electrodes for electro-peroxone process. It was found that the n-C3 N4 /CNT composite exhibited the highest efficiency in oxalate degradation, though it performed the worst in the oxygen-reduction reaction for H2 O2 production. The n-C3 N4 /CNT composite exhibited higher activity than CNT and other composites in catalytic ozonation experiments, due to the higher pyrrolic-N content modified on the CNT surface and higher surface area...
March 7, 2018: Chemosphere
Jiadong Sheng, Shenglin Zhou, Zhaohui Yang, Xiaohua Zhang
We investigate the effect of the presence of vertically aligned multiwalled carbon nanotubes (CNT) on the orientation of poly(ethylene oxide)(PEO) lamellae and PEO crystallinity. The high alignment of carbon nanotubes acting as templates probably governs the orientation of PEO lamellae. This templating effect might results in the lamella planes of PEO crystals oriented along a direction parallel to the long axis of nanotubes. The presence of aligned carbon nanotubes also gives rise to the decreases in PEO crystallinity, crystallization temperature and melting temperature due to the perturbation of carbon nanotubes to the crystallization of PEO...
March 5, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Xiaoxiao Wei, Yuzhi Wang, Jing Chen, Panli Xu, Yigang Zhou
A novel magnetic solid-phase extraction (MSPE) method based on 1-hexyl-3-methyl imidazolium chloride ionic liquid (IL) modified magnetic Fe3 O4 nanoparticles, hydroxylated multiwall carbon nanotubes (MWCNTs-OH) and zeolitic imidazolate frameworks (ZIFs) nanocomposites (Fe3 O4 -MWCNTs-OH@ZIF-67@IL) were proposed and applied to extract α-chymotrypsin. The magnetic materials were synthesized successfully and characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), thermal gravimetric analysis (TGA), fourier transform infrared spectrometry (FT-IR), vibrating sample magnetometer (VSM) and zeta potentials...
May 15, 2018: Talanta
Fuying Du, Ying-Sing Fung
Methyl parathion (MP) is a highly toxic organophosphate and its exposure may lead to substantial adverse effects to human health. The existence of 4-nitrophenol (4-NP) in the form of free phenol, glucuronide (4-NP-G) or as a sulfate ester (4-NP-S) can be used as biomarkers to assess the duration and extent of MP exposure. In this work, a MC-CE device incorporating post-CE amperometric detection using multi-walled carbon nanotubes (MWNTs) modified carbon fiber microelectrode (CFME) was fabricated and assessed for simultaneous determination of 4-NP, 4-NP-G and 4-NP-S in human urine...
March 3, 2018: Electrophoresis
Shixin Song, Shan Xia, Shangkun Jiang, Xue Lv, Shulin Sun, Quanming Li
A facile strategy is adopted to prepare carboxylic functionalized multiwalled carbon nanotube (c-MWCNT) modified high dielectric constant (high- k ) poly(vinylidene fluoride) (PVDF) composites with the aid of methyl methacrylate-co-glycidyl methacrylate copolymer (MG). The MG is miscible with PVDF and the epoxy groups of the copolymer can react with the carboxylic groups of c-MWCNT, which induce the uniform dispersion of c-MWCNT and a form insulator layer on the surface of c-MWCNT. The c-MWCNTs/MG/PVDF composites with 8 vol % c-MWCNT present excellent dielectric properties with high dielectric constant (~448) and low dielectric loss (~2...
February 27, 2018: Materials
Célia Ventura, António Sousa-Uva, João Lavinha, Maria João Silva
The widespread application of carbon nanotubes (CNT) on industrial, biomedical, and consumer products can represent an emerging respiratory occupational hazard. Particularly, their similarity with the fiber-like shape of asbestos have raised a strong concern about their carcinogenic potential. Several in vitro and in vivo studies have been supporting this view by pointing to immunotoxic, cytotoxic and genotoxic effects of some CNT that may conduct to pulmonary inflammation, fibrosis, and bronchioloalveolar hyperplasia in rodents...
February 26, 2018: Environmental and Molecular Mutagenesis
Antonio Pietroiusti, Helene Stockmann-Juvala, Francesca Lucaroni, Kai Savolainen
The use of engineered nanomaterials (ENM) has grown after the turn of the 21st century. Also, the production of ENM has globally grown, and exposure of workers especially via the lungs to ENM has increased. This review tackles with effects of ENM on workers' health because occupational environment is the main source of exposure to ENM. Assessment of exposure to ENM is demanding, and today there are no occupational exposure level (OEL) for ENM. This is partly due to challenges of such measurements, and in part to the unknown causality between ENM metrics and effects...
February 23, 2018: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
Dominique Mombrú, Mariano Romero, Ricardo Faccio, Alvaro W Mombrú
In the present report, we focused on the study of the out-of-plane electrical transport of multiwalled carbon nanotube (MWCNT)-doped poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) composites (PEDOT:PSS-MWCNTs) as electrodes for solar cell applications. The out-of-plane direct current and alternating current electrical transport, rarely studied but not less relevant, was additionally supported with in-plane and out-of-plane confocal Raman microscopy and grazing incidence small-angle X-ray scattering characterizations...
February 21, 2018: Journal of Physical Chemistry. B
Caterina Fusco, Michele Casiello, Lucia Catucci, Roberto Comparelli, Pietro Cotugno, Aurelia Falcicchio, Francesco Fracassi, Valerio Margiotta, Anna Moliterni, Francesca Petrone, Lucia D'Accolti, Angelo Nacci
Anatase (TiO₂) and multiwalled carbon nanotubes bearing polyethylenimine (PEI) anchored on their surface were hybridized in different proportions according to a sol-gel method. The resulting nanocomposites (TiO₂@PEI-MWCNTs), characterized by BET, XRD, XPS, SEM, and UV techniques, were found efficient catalysts for CO₂ photoreduction into formic and acetic acids in water suspension and under visible light irradiation. PEI-grafted nanotubes co-catalysts are believed to act as CO₂ activators by forming a carbamate intermediate allowing to accomplish the first example in the literature of polyamines/nanotubes/TiO₂ mediated CO₂ photoreduction to carboxylic acids...
February 20, 2018: Materials
Monika Mortimer, Naresh Devarajan, Dong Li, Patricia A Holden
Carbonaceous and boron nitride (BN) nanomaterials have similar applications and hydrophobic properties suggesting common release pathways and exposure to bacteria. While high nanomaterial concentrations can be bactericidal or growth-inhibitory, little is known regarding bacterial transcriptional responses to non-growth-inhibitory nanomaterial concentrations. Here, using one strain of Pseudomonas aeruginosa-a clinically and environmentally important bacterial taxon-we analyzed the comparative transcriptomic response to carbonaceous or BN nanomaterials...
February 19, 2018: ACS Nano
Henriqueta Louro
The manufactured nanomaterials (NMs) have specific physicochemical properties that confer unique mechanical, optical, electrical and magnetic characteristics that are beneficial for biomedical and industrial applications. However, recent studies have suggested that such specific physicochemical properties of the NMs may define nano-bio interactions thereby determining their toxic potential.One of the major concerns about NMs is the potential to induce cancer, suggested by some experimental studies, as seen for titanium dioxide nanomaterials or carbon nanotubes...
2018: Advances in Experimental Medicine and Biology
Sung Yong Kim, Se Hoon Park, Baek Gyu Choi, In Hyuk Kang, Sang Wook Park, Jeong Woo Shin, Jin Ho Kim, Woon Kyung Baek, Kwon Taek Lim, Young-Ju Kim, Jae-Bok Song, Inpil Kang
This study reports a hub-spoke type joint torque sensor involving strain gauges made of multiwalled carbon nanotubes (MWCNT). We developed the novel joint torque sensor for robots by means of MWCNT/epoxy strain sensors (0.8 wt%, gauge factor 2) to overcome the limits of conventional foil strain gauges. Solution mixing process was hired to fabricate a liquid strain sensor that can easily be installed on any complicated surfaces. We painted the MWCNT/epoxy mixing liquid on the hub-spoke type joint torque sensor to form the piezoresistive strain gauges...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Heidy Cruz, Younggon Son
Since the discovery of carbon nanotubes (CNT), significant research works have focused on the application of CNT as conductive filler to polymer nanocomposites which can be used in several fields such as electrostatic dissipation (ESD), electrostatic painting and electromagnetic interference shielding (EMI-shielding). However, the main challenge in the large-scale manufacturing of this technology is the poor electrical conductivity of polymer nanocomposites produced by injection molding process. This study aims to investigate the effect of CNT aspect ratio in improving the electrical conductivity of injection molded nanocomposites...
February 1, 2018: Journal of Nanoscience and Nanotechnology
M H Bahreyni-Toosi, M H Zare, A Ale-Davood, M T Shakeri, S Soudmand
Background and Objective: Multi-walled Carbon Nano Tubes (MWCNTs) as an important element of nanosciences have a remarkable absorption in the region of NIR window (650-900 nm) which can overcome the limitations of deep treatment in photothermal therapy. To disperse MWCNTs in water, it is proposed to attach carboxylated functional group (-COOH) to MWCNTs in order to increase dispersivity in water. Materials and Methods: A stable suspension of MWCNTs-COOH with different concentrations (from 2...
December 2017: Journal of Biomedical Physics & Engineering
Emilio Muñoz-Sandoval, Juan L Fajardo-Díaz, Roque Sánchez-Salas, Alejandro J Cortés-López, Florentino López-Urías
Nitrogen-doped carbon sponge-type nanostructures (N-CSTNs) containing coaxial multiwalled carbon nanotubes are synthesized at 1020 °C by using a modified chemical vapor deposition (CVD) arrangement. Here, the CVD reactor is supplied by two flows coming from two independent sprayers (called sprayer A and sprayer B). The nebulized material in each sprayer is transported by two different gases with different flow velocities. The synthesis of carbon N-CSTNs is performed using different precursors: sprayer A contains a solution composed of ethanol, thiophene and ferrocene, whereas sprayer B contains a solution of benzylamine, thiophene and ferrocene...
February 14, 2018: Scientific Reports
Samar Damiati, Martin Peacock, Stefan Leonhardt, Laila Damiati, Mohammed A Baghdadi, Holger Becker, Rimantas Kodzius, Bernhard Schuster
Hepatic oval cells (HOCs) are considered the progeny of the intrahepatic stem cells that are found in a small population in the liver after hepatocyte proliferation is inhibited. Due to their small number, isolation and capture of these cells constitute a challenging task for immunosensor technology. This work describes the development of a 3D-printed continuous flow system and exploits disposable screen-printed electrodes for the rapid detection of HOCs that over-express the OV6 marker on their membrane. Multiwall carbon nanotube (MWCNT) electrodes have a chitosan film that serves as a scaffold for the immobilization of oval cell marker antibodies (anti-OV6-Ab), which enhance the sensitivity of the biomarker and makes the designed sensor specific for oval cells...
February 14, 2018: Genes
Krishnamoorthy Rajavel, Padmanapan Saravanan, Ramasamy Thangavelu Rajendra Kumar
An investigation on varying experimental parameters such as solution quantity (2.5, 5 and 7.5 mL) and reaction time (15, 30, 45 and 60 min) was carried out for the production of high-quality multiwalled carbon nanotubes (MWCNTs) in one step pyrolysis. Structural analysis revealed the uniform diameter distribution and the length of nanotubes in the range of 60-80 nm and 0.4-2 μm, respectively. Raman and X-ray diffraction analysis showed a remarkable reduction in defect density with increase in graphitization degree, upon increasing the solution volume and reaction time...
May 1, 2018: Journal of Nanoscience and Nanotechnology
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