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Multiwall carbon nanotubes

Kobra Rostamizadeh, Mina Habibizadeh, Naser Dalali, Ali Ramazani
No abstract text is available yet for this article.
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Niloofar Jalilian, Homeira Ebrahimzadeh, Ali Akbar Asgharinezhad
In this work, the extraction of aromatic amines with an efficient magnetic multiwalled carbon nanotubes/Fe3O4@Poly(1,8-diaminonaphtalen) (MWCNTs/Fe3O4@PDAN) composite followed by HPLC-DAD was presented. Imprimis, the comparison among different magnetic nanosorbents including Fe3O4, MWCNTs/Fe3O4, Fe3O4@PDAN and MWCNTs/Fe3O4@PDAN was conducted. The obtained results, exhibited that the MWCNTs/Fe3O4@PDAN composite has the highest extraction efficiency for target analytes (3-nitroaniline, 4-chloroaniline, 4-bromoaniline and 3,4-dichloroaniline)...
April 2, 2017: Journal of Chromatography. A
Rilong Zhu, Gangqiang Zhou, Fengxia Tang, Chunyi Tong, Yeyao Wang, Jinsheng Wang
Based on the strong interaction between histidine and copper ions and the signal enhancement effect of gold-labeling carbon nanotubes, an electrochemical sensor is established and used to measure copper ions in river water. In this study the results show that the concentrations of copper ion have well linear relationship with the peak current in the range of 10(-11)-10(-7 )mol/L, and the limit of detection is 10(-12 )mol/L. When using this method to detect copper ions in the Xiangjiang River, the test results are consistent with the atomic absorption method...
2017: International Journal of Analytical Chemistry
Xiaofei Hu, Zifan Li, Jun Chen
Developing flexible Li-CO2 batteries is a promising approach to reuse CO2 and simultaneously supply energy to wearable electronics. However, all reported Li-CO2 batteries use liquid electrolyte and lack robust electrolyte/electrodes structure, not providing the safety and flexibility required. Herein we demonstrate flexible liquid-free Li-CO2 batteries based on poly(methacrylate)/poly(ethylene glycol)-LiClO4 -3 wt %SiO2 composite polymer electrolyte (CPE) and multiwall carbon nanotubes (CNTs) cathodes. The CPE (7...
April 13, 2017: Angewandte Chemie
Emad M Elsehly, N G Chechenin, A V Makunin, H A Motaweh, E G Leksina
This investigation examines the filtration efficiency of chromium from aqueous solution using two types of commercial multiwalled carbon nanotubes (MWCNTs) (Taunit-M (TM) and Taunit-MD (TMD)). These MWCNTs were modified using two complementary treatments, purification (using a mixture of hydrochloric acid and hydrogen peroxide) and functionalization (using nitric acid). The effect of these treatments on the morphology of MWCNT Taunit filters was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy to estimate the outer diameter distribution and element content deposited on filters...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Aamir Abbas, Basim Ahmed Abussaud, Ihsanullah, Nadhir A H Al-Baghli, Halim Hamid Redhwi
Multiwall carbon nanotubes (CNTs) and iron oxide impregnated carbon nanotubes (CNTs-iron oxide) were investigated for the adsorption of hazardous toluene and paraxylene (p-xylene) from aqueous solution. Pure CNTs were impregnated with iron oxides nanoparticles using wet impregnation technique. Various characterization techniques including thermogravimetric analysis, scanning electron microscopy, elemental dispersion spectroscopy, X-ray diffraction, and nitrogen adsorption analysis were used to study the thermal degradation, surface morphology, purity, and surface area of the materials...
2017: Bioinorganic Chemistry and Applications
Elena Dilonardo, Michele Penza, Marco Alvisi, Riccardo Rossi, Gennaro Cassano, Cinzia Di Franco, Francesco Palmisano, Luisa Torsi, Nicola Cioffi
Multiwalled carbon nanotube (MWCNT)-based chemiresistors were electrochemically decorated with Au and Pd nanoparticles (NPs), resulting in an improvement in the detection of gaseous pollutants as compared to sensors based on pristine MWCNTs. Electrophoresis was used to decorate MWCNTs with preformed Au or Pd NPs, thus preserving their nanometer-sized dimensions and allowing the metal content to be tuned by simply varying the deposition time. The sensing response of unmodified and metal-decorated MWCNTs was evaluated towards different gaseous pollutants (e...
2017: Beilstein Journal of Nanotechnology
Smail Hamamda, Ahmed Jari, S Revo, K Ivanenko, Youcef Jari, T Avramenko
The aim of this research is the thermostructural study of Cu-Ti, Cu-Ti 1 vol% multiwall carbon nanotubes (MWCNTs) and Cu-Ti 3 vol% MWCNTs. Several investigation techniques were used to achieve this objective. Dilatometric data show that the coefficient of thermal expansion of the nanocomposite containing less multiwall carbon nanotubes is linear and small. The same nanocomposite exhibits regular heat transfer and weak mass exchange with the environment. Raman spectroscopy shows that the nanocomposite with more MWCNTs contains more defects...
December 2017: Nanoscale Research Letters
Dahyun Oh, Çagla Ozgit-Akgun, Esin Akca, Leslie E Thompson, Loza F Tadesse, Ho-Cheol Kim, Gökhan Demirci, Robert D Miller, Hareem Maune
Synthetic porogens provide an easy way to create porous structures, but their usage is limited due to synthetic difficulties, process complexities and prohibitive costs. Here we investigate the use of bacteria, sustainable and naturally abundant materials, as a pore template. The bacteria require no chemical synthesis, come in variable sizes and shapes, degrade easier and are approximately a million times cheaper than conventional porogens. We fabricate free standing porous multiwalled carbon nanotube (MWCNT) films using cultured, harmless bacteria as porogens, and demonstrate substantial Li-oxygen battery performance improvement by porosity control...
April 4, 2017: Scientific Reports
Utkarsh Jain, Shaivya Gupta, Nidhi Chauhan
Glycated hemoglobin (HbA1c), a marker for glycine level in blood, while detecting over a long period of time (up to 2-3 months) shows consistency. Therefore, HbA1c has been mostly used and indeed an established test for monitoring the glycemic control in persons suffering from diabetes. 3D-structured reduced graphene oxide (rGO), multiwalled carbon nanotubes (MWCNT) and platinum nanoparticles (PtNPs) composite (PtNPs/rGO-MWCNT) were synthesized and used as interface for the development of an electrochemical HbA1c biosensor...
March 30, 2017: International Journal of Biological Macromolecules
Xiaomei Wan, Susu Tang, Xinran Xiang, He Huang, Yi Hu
Multiwalled carbon nanotubes (MWNTs) were modified by imidazole-based ionic liquids with different alkyl groups. The modified support samples were characterized by scanning transmission electron microscopy, Raman spectra, thermogravimetric analyses, and X-ray photoelectron spectroscopy. The samples were used to immobilize Candida antarctic lipase (CALB) and the influence of alkyl chain length of ionic liquids on enzymatic properties was investigated by the hydrolysis reaction of triacetin. The results revealed that functionalized ionic liquids modification did not destroy the structure of MWNTs...
March 29, 2017: Applied Biochemistry and Biotechnology
Xia Dong, Chang Wei, Jie Liang, Tianjun Liu, Deling Kong, Feng Lv
Controlled drug release with on demand is an important challenge for drug delivery. Near-infrared (NIR) light triggered drug delivery reflected the development of a significant strategy to control drug release based on photothermal effects. Herein, a sustained and controlled drug delivery system was developed based on a PCL-PEG-PCL thermosensitive hydrogel combined with chitosan-multiwalled carbon nanotubes for a near infrared light triggered drug delivery. Carbon nanotubes that incorporate hydrogel can enhance the sustained effect of drug delivery by a dual-stage release and allow drug delivery by controlling light irradiation...
March 19, 2017: Colloids and Surfaces. B, Biointerfaces
Jette Bornholdt, Anne Thoustrup Saber, Berit Lilje, Mette Boyd, Mette Jørgensen, Yun Chen, Morana Vitezic, Nicklas Raun Jacobsen, Sarah Søs Poulsen, Trine Berthing, Simon Bressendorff, Kristoffer Vitting-Seerup, Robin Andersson, Karin Sørig Hougaard, Carole L Yauk, Sabina Halappanavar, Håkan Wallin, Ulla Vogel, Albin Sandelin
Increased use of nanomaterials in industry, medicine and consumer products has raised concerns over their toxicity. To ensure safe use of nanomaterials, understanding their biological effects at the molecular level is crucial. In particular, the regulatory mechanisms responsible for the cascade of genes activated by nanomaterial exposure are not well characterized. To this end, we profiled the genome-wide usage of gene transcription start sites and linked active enhancer regions in lungs of C57BL/6 mice 24h after intratracheal instillation of a single dose of the multiwalled carbon nanotube Mitsui-7...
March 27, 2017: ACS Nano
Edgar Mijangos, Souvik Roy, Sonja Pullen, Reiner Lomoth, Sascha Ott
The development of a reliable platform for the electrochemical characterization of a redox-active molecular diiron complex, [FeFe], immobilized in a non-conducting metal organic framework (MOF), UiO-66, based on glassy-carbon electrodes is reported. Voltammetric data with appreciable current responses can be obtained by the use of multiwalled carbon nanotubes (MWCNT) or mesoporous carbon (CB) additives that function as conductive scaffolds to interface the MOF crystals in "three-dimensional" electrodes. In the investigated UiO-66-[FeFe] sample, the low abundance of [FeFe] in the MOF and the intrinsic insulating properties of UiO-66 prevent charge transport through the framework, and consequently, only [FeFe] units that are in direct physical contact with the electrode material are electrochemically addressable...
April 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Charinrat Siritham, Chongdee Thammakhet-Buranachai, Panote Thavarungkul, Proespichaya Kanatharana
A novel preconcentrator-separator two-in-one online system has been developed for the online analysis of trace amounts of four polycyclic aromatic hydrocarbons (PAHs) in tea samples. A micro-preconcentrator unit of zeolite imidazolate framework-8-poly(vinyl alcohol) cryogel (ZIF-8-PVA cryogel) and a micro-separation unit of multiwalled carbon nanotubes-poly(vinyl alcohol) cryogel (MWCNTs-PVA cryogel) were fabricated onto an acrylic plate. The eluent from this two-in-one system flowed directly to an on-column UV-visible detector...
May 15, 2017: Talanta
Hend Samy Magar, Mariana Emilia Ghica, Mohammed Nooredeen Abbas, Christopher M A Brett
A novel amperometric biosensor for choline determination has been developed, exploiting the electrocatalytic properties of multiwalled carbon nanotubes (MWCNT) and gold nanoparticles (GNP). Chitosan (Chit), a natural biocompatible polymer, was used to disperse CNT, then Chit-MWCNT was dropped on the surface of a glassy carbon electrode (GCE), followed by GNP; finally, choline oxidase (ChOx) was immobilized by glutaraldehyde crosslinking. The ChOx/(GNP)4/MWCNT/GCE exhibited linear response to choline from 3 to 120µM, the sensitivity was 204µAcm(-2)mM(-1) and the detection limit was 0...
May 15, 2017: Talanta
Berna Dalkıran, Pınar Esra Erden, Esma Kılıç
A comparison of the analytical performances of two xanthine biosensors, based on the use of different metal oxide nanoparticles (MONPs: Co3O4 or Fe3O4)-modified carboxylated multiwalled carbon nanotubes (c-MWCNTs)-7,7',8,8'-tetracyanoquinodimethane (TCNQ)-chitosan (CHIT) composite, is discussed. Xanthine oxidase (XOD) enzyme was covalently attached to c-MWCNTs/MONPs/TCNQ/CHIT/GCE via N-ethyl-N'-(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxy succinimide (NHS) chemistry and the electrode surface was further modified with Nafion in order to minimize the effect of possible interfering substances...
May 15, 2017: Talanta
Ramathasan Thevamaran, Deepika Saini, Mehmet Karakaya, Jingyi Zhu, Ramakrishna Podila, Apparao M Rao, Chiara Daraio
We describe the super compressible and highly recoverable response of bucky sponges as they are struck by a heavy flat-punch striker. The bucky sponges studied here are structurally stable, self-assembled mixtures of multiwalled carbon nanotubes (MWCNTs) and carbon fibers (CFs). We engineered the microstructure of the sponges by controlling their porosity using different CF contents. Their mechanical properties and energy dissipation characteristics during impact loading are presented as a function of their composition...
May 5, 2017: Nanotechnology
Hristiana Velichkova, Stanislav Kotsilkov, Evgeni Ivanov, Rumiana Kotsilkova, Stanislav Gyoshev, Nikolay Stoimenov, Nikolay K Vitanov
Poly(lactic) acid (PLA) film with 2 wt % mixed carbon nanofillers of graphene nanoplates (GNPs) and multiwall carbon nanotubes (MWCNTs) in weight ratio 1:1 with impurities of fullerene and carbon black (CB) was produced by layer to layer deposition and hot pressing. The release of carbon nanoparticles from the film was studied at varying time-temperature conditions and simulants. Migrants in simulant solvents were examined with laser diffraction analysis and transmission electron microscopy. The film integrity and the presence of migrants on the film surfaces were visualized by scanning electron microscopy...
March 24, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Farshid Homayoon, Hossein Faghihian, Firoozeh Torki
In this research, multiwall carbon nanotube was magnetized and subsequently functionalized by thiosemicarbazide. After characterization by FTIR, BET, SEM, EDAX, and VSM techniques, the magnetized adsorbent (multi-walled carbon nanotubes (MWCNTs)/Fe3O4) was used for removal of Hg(2+) from aqueous solutions and the experimental conditions were optimized. The adsorption capacity of 172.83 mg g(-1) was obtained at 25 °C and pH = 3 which was superior to the value obtained for initial multiwall carbon nanotube, magnetized sample, and many previously reported values...
March 23, 2017: Environmental Science and Pollution Research International
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