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Multiwall carbon nanotubes

Cristina Ocaña, Natalia Abramova, Andrey Bratov, Tom Lindfors, Johan Bobacka
We report here the fabrication of solid-contact calcium-selective electrodes (Ca2+ -SCISEs) made of a polyurethane acrylate ion-selective membrane (ISM) that was covalently attached to the underlying ion-to-electron transducer (solid-contact). Methacrylate-functionalized poly(3,4-ethylenedioxythiophene) (Meth-PEDOT) and Meth-PEDOT films containing either multiwalled carbon nanotubes (MWCNT) or carboxylated MWCNT (cMWCNT) were used as solid contacts. The solid contacts were deposited by drop-casting on screen-printed electrodes and characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and potentiometry...
August 15, 2018: Talanta
Vytas Reipa, Shannon K Hanna, Aaron Urbas, Lane Sander, John Elliott, Joseph Conny, Elijah J Petersen
As the production mass of multiwall carbon nanotubes (MWCNT) increases, the potential for human and environmental exposure to MWCNTs may also increase. We have shown that exposing an aqueous suspension of pristine MWCNTs to an intense oxidative treatment in an electrochemical reactor, equipped with an efficient hydroxyl radical generating Boron Doped Diamond (BDD) anode, leads to their almost complete mineralization. Thermal optical transmittance analysis showed a total carbon mass loss of over two orders of magnitude due to the electrochemical treatment, a result consistent with measurements of the degraded MWCNT suspensions using UV-vis absorbance...
April 26, 2018: Journal of Hazardous Materials
Naphat Yuphintharakun, Piyaluk Nurerk, Kochaporn Chullasat, Proespichaya Kanatharana, Frank Davis, Dhassida Sooksawat, Opas Bunkoed
A nanocomposite optosensor consisting of carboxylic acid functionalized multiwall carbon nanotubes and CdTe quantum dots embedded inside a molecularly imprinted polymer (COOH@MWCNT-MIP-QDs) was developed for trace ciprofloxacin detection. The COOH@MWCNT-MIP-QDs were synthesized through a facile sol-gel process using ciprofloxacin as a template molecule, 3-aminopropylethoxysilane as a functional monomer and tetraethoxysilane as a cross-linker at a molar ratio of 1:8:20. The synthesized nanocomposite optosensor had high sensitivity, excellent specificity and high binding affinity to ciprofloxacin...
May 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Peng Liu, Duanliang Zhou, Chunhai Zhang, Haoming Wei, Xinhe Yang, Yang Wu, Qingwei Li, Changhong Liu, Bingchu Du, Liang Liu, Kaili Jiang, Shoushan Fan
With the super aligned carbon nanotube (SACNT) film, we have fabricated crystalline multiwall CNT (MWCNT) by adopting a high pressure and high temperature processing. The CNTs keep parallel to each other and distributed uniformly. XRD characterization shows peaks at small angle range, which can be assigned to the spacing of MWCNT crystal. The mechanical, electrical and thermal properties are all greatly improved compared with the original CNT film. The field emission properties of crystalline MWCNT are tested and it shows a better surface morphology stability at large emission current...
May 18, 2018: Nanotechnology
Vassilis Tangoulis, Nikolia Lalioti, John Parthenios, Nikos Boukos, Ondřej Malina, Jiří Tuček, Radek Zbořil
While synthetic methods for the grafting of nanoparticles or photoactive molecules onto carbon nanotubes (CNTs) have been developed in the last years, a very limited number of reports have appeared on the grafting of single-molecule magnets (SMMs) onto CNTs. There are many potential causes, mainly focused on the fact that the attachment of molecules on surfaces remains not trivial and their magnetic properties are significantly affected upon attachment. Nevertheless, implementation of this particular type of hybrid material in demanding fields such as spintronic devices makes of utmost importance the investigation of new synthetic protocols for effective grafting...
May 18, 2018: Inorganic Chemistry
K U Minchitha, H N Hareesh, N Nagaraju, N Kathyayini
Sulphate modified multiwalled carbon nanotubes (S-MWCNT) and Mesoporous carbon (S-MC) catalysts were prepared by wet impregnation method. These materials were characterized by different analytical techniques such as Powder-XRD, BET surface area analysis, SEM-EDS and TEM analysis to evaluate their bulk and surface properties. Surface acidity of the catalyst was measured by TPD-NH3 technique, as well as n-butyl amine titration. The estimated surface acidity of S-MWCNT and S-MC using n-butyl amine titration was found to be 0...
January 1, 2018: Journal of Nanoscience and Nanotechnology
K U Minchitha, H N Hareesh, K Venkatesh, M Shanty, N Nagaraju, N Kathyayini
Sulphate ion modified multiwalled carbon nanotubes (S-CNTs), mesoporous carbon (S-MC), zirconia (S-ZrO2), alumina (S-Al2O3) and silica (S-SiO2) were prepared by wet impregnation technique. The physico-chemical properties of the prepared materials were investigated by Powder-XRD, BET-Surface area and SEM-EDS analysis. Surface acidity of the materials was analyzed using TPD-NH3 and n-butyl amine titration methods. Catalytic activity of these materials was investigated in liquid phase transesterification of diethyl malonate with benzyl alcohol...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Vahid Vatanpour, Ali Ghadimi, Atefeh Karimi, Alireza Khataee, Mohammad Ehsan Yekavalangi
Polypyrrole (PPy) coated raw and oxidized multiwalled carbon nanotubes (MWCNTs) nanocomposites were synthesized and used for hydrophilic modification of polyvinylidene fluoride (PVDF) ultrafiltration membranes. The prepared nanocomposites were characterized using XRD, FTIR and SEM techniques. The hydrophilicity of the fabricated membranes was evaluated using water contact angle measurements, where the mixed matrix membranes presented lower contact angle compared with the bare one. The performance results showed that the pure water flux increased from 152...
August 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Manish Kumar, Gajanand Sharma, Charu Misra, Rajendra Kumar, Bhupinder Singh, O P Katare, Kaisar Raza
Our aim was to develop multiwalled carbon nanotubes (MWCNTs)-based nanoconstructs for the codelivery of N-desmethyl tamoxifen (N-TAM) and a mild P-gp efflux inhibitor, i.e., quercetin (QT) to treat multiple drug resistant (MDR) cancer cells. The hypothesis banks on three-tier attack on the MDR mechanisms viz. drug derivatization, MWCNT permeation and P-gp inhibition. Tamoxifen was converted to N-TAM and was conjugated to carboxylated MWCNTs mediated by a biodegradable linker, i.e., tetraethylene glycol (TEG)...
August 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Mariana Morozesk, Lidiane S Franqui, Adrislaine S Mansano, Diego Stéfani T Martinez, Marisa N Fernandes
The widespread production and application of carbon nanotubes (CNT) have raising concerns about their release into the environment and, the joint toxicity of CNT with pre-existing contaminants needs to be assessed. This is the first study that investigated the co-exposure of oxidized multiwalled carbon nanotubes (ox-MWCNT) and cadmium (Cd) using a zebrafish liver cell line (ZFL). Two in vitro co-exposure protocols differing by the order of ox-MWCNT interaction with Cd and fetal bovine serum (FBS) proteins were evaluated...
May 5, 2018: Aquatic Toxicology
Adolph Anga Muleja
This study entails adsorption attempt of platinum ion from "aged" aqueous solution with purified multiwalled carbon nanotubes and tryphenylphosphine-linked multiwalled carbon nanotubes (1) and (2) (Tpp-MWCNTs (1) and Tpp-MWCNTs (2)). The aims were to produce and use purified MWCNTs, Tpp-MWCNTs (1) and (2) and compare their adsorption capacity. These adsorbents were characterised with SEM, FTIR, XPS, BET and zeta potential. Tpp-MWCNTs (1) and (2) differ by their atomic percentage content of phosphorus which is 0...
May 10, 2018: Environmental Science and Pollution Research International
Xiaofei Hu, Gulbahar Dawut, Jiaqi Wang, Haixia Li, Jun Chen
We constructed rechargeable Na-SO2 batteries, based on a NaI redox mediator and containing a gel-polymer electrolyte and a multiwall carbon nanotube@Ni foam porous cathode, with a newly demonstrated battery reaction, specifically 2Na + 2SO2 ↔ Na2S2O4. A large reversible capacity of 5000 mA h g-1 at 200 mA g-1 (763 W h kg-1) and a high capacity retention of nearly 100% after 100 cycles were obtained.
May 8, 2018: Chemical Communications: Chem Comm
Jessy Shiju, Fakhreia Al-Sagheer, Ali Bumajdad, Zahoor Ahmad
In this work in-situ polymerization technique has been used to chemically link the functionalized multiwalled carbon nanotubes (CNTs) with aramid matrix chains. Phenylene diamine monomers were reacted in the first stage with the carboxylic acid functionalized CNTs and then amidized in-situ using terephthaloyl chloride generating chemically bonded CNTs with the matrix. Various proportions of the CNTs were used to prepare the hybrid materials. The functionalization procedure was studied by Fourier transform infrared (FTIR) spectroscopy and composite morphology investigated by scanning electron microscopy (SEM)...
May 7, 2018: Nanomaterials
Esther Sánchez-Tirado, Araceli González-Cortés, Paloma Yáñez-Sedeño, José M Pingarrón
This paper reports the development and performance of an electrochemical immunosensor using magnetic multiwalled carbon nanotubes (m-MWCNTs) as nanocarrier tags for the determination of human fetuin A (HFA), a relevant biomarker of obesity, insulin resistance, and type-2 diabetes as well as for pancreatic and liver cancers and inflammatory processes. Screen-printed carbon electrodes were grafted with p-aminobezoic acid and streptavidin was covalently immobilized on the electrode surface. A biotinylated capture antibody was immobilized through streptavidin-biotin interaction and a sandwich assay configuration was implemented using m-MWCNTs conjugated with HRP and anti-HFA antibodies as the detection label...
April 30, 2018: Biosensors & Bioelectronics
Salem M Aqeel, Zhongyuan Huang, Jonathan Walton, Christopher Baker, D'Lauren Falkner, Zhen Liu, Zhe Wang
Polyvinylidene fluoride (PVDF)/Polyacrilonitrile (PAN)/Multiwalled nanotubes functionalized COOH (MWNT-COOH) nanocomposites with different contents of MWNTs were fabricated by using electrospinning and solution cast methods. The interaction of the MWNTs with the polymer blend was confirmed by a Fourier transform infrared (FTIR) spectroscopy study. The dispersion of the MWNTs in the polymer blend was studied by scanning electron microscopy. The impedance and electrical conductivity of PVDF-PAN/CNTs in a wide frequency range at different temperatures have been studied...
March 2018: Advanced Composites and Hybrid Materials
Craig McBeth, Rajaa Al Dughaishi, Andrew Paterson, Duncan Sharp
The measurement of pH is important throughout many biological systems, but there are limited available technologies to enable its periodical monitoring in the complex, small volume, media often used in cell culture experiments across a range of disciplines. Herein, pad printed electrodes are developed and characterised through modification with: a commercially available fullerene multiwall carbon nanotube composite applied in Nafion, casting of hydrophobic ubiquinone as a pH probe to provide the electrochemical signal, and coated in Polyethylene glycol to reduce fouling and potentially enhance biocompatibility, which together are proven to enable the determination of pH in cell culture media containing serum...
April 26, 2018: Biosensors & Bioelectronics
F Khodabakhshi, M Nosko, A P Gerlich
Multipass friction-stir processing was employed to uniformly disperse multiwalled carbon nanotubes (MW-CNTs) within an Al-Mg alloy metal matrix. Decomposition of MW-CNTs occurs in situ as a result of solid-state chemical reactions, forming fullerene (C60) and aluminium carbide (Al4 C3 ) phases during reactive high temperature severe plastic processing. The effects of this decomposition on the microstructural features, dynamic restoration mechanisms and crystallographic microtextural developments are studied for the first time by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analysis...
May 3, 2018: Journal of Microscopy
Taleb H Ibrahim, Muhammad A Sabri, Mustafa I Khamis
Multiwalled carbon nanotubes and their magnetite derivatives were employed as adsorbents for emulsified oil removal from produced water. The experimental parameters for maximum emulsified oil removal efficiency and effective regeneration of these adsorbents were determined. The optimum parameters in terms of adsorbent dosage, contact time, salinity, pH and temperature were 3.0 g/L, 20.0 min, 0 ppm, 7.0 and 25°C for both adsorbents. Due to their low density, multiwalledcarbon nanotubes could not be successfully employed in packed bed columns...
May 2, 2018: Environmental Technology
Shahid Mehmood, Regina Ciancio, Elvio Carlino, Arshad S Bhatti
Background: The combination of Au-metallic-NPs and CNTs are a new class of hybrid nanomaterials for the development of electrochemical biosensor. Concentration of Au(nanoparticles [NPs]) in the electrochemical biosensor is crucial for the efficient charge transfer between the Au-NPs-MWCNTs modified electrode and electrolytic solution. Methods: In this work, the charge transfer kinetics in the glassy carbon electrode (GCE) modified with Au(NPs)-multiwalled carbon nanotube (MWCNT) nanohybrid with varied concentrations of Au(NPs) in the range 40-100 nM was studied using electrochemical impedance spectroscopy (EIS)...
2018: International Journal of Nanomedicine
Dongxia Ren, Chengjun Sun, Guanqun Ma, Danni Yang, Chen Zhou, Jiayu Xie, Yongxin Li
A new method has been developed to simultaneously determine 7 pyrethroid residues in tea brew using gas chromatography-mass spectrometry (GC-MS) combined with solid phase microextraction (SPME) with multiwalled carbon nanotubes (MWCNTs) coated fiber. The MWCNTs coated fiber of SPME was homemade by using stainless steel wire as coating carrier and polyacrylonitrile (PAN) solution as adhesive glue. Under the optimized conditions, a good linearity was shown for bifenthrin, fenpropathrin, permethrin, and cyfluthrin in 1-50 ng mL-1 and for cypermethrin, fenvalerate, and deltamethrin in 5-50 ng mL-1 ...
2018: International Journal of Analytical Chemistry
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