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Multiwall carbon nanotubes

K Koteshwara Reddy, M Satyanarayana, K Yugender Goud, K Vengatajalabathy Gobi, Hern Kim
An efficient electrochemical sensor for selective detection of the neurotransmitter, epinephrine (Epn), has been fabricated with the aid of a functionalized multiwall carbon nanotube-chitosan biopolymer nanocomposite (Chit-fCNT) electrode. Multiwall carbon nanotubes (CNT) were successfully functionalized with the aid of nitric acid and confirmed by the Raman spectral data. Functionalized carbon nanotubes (fCNT) were dispersed in chitosan solution and the resulting bio-nanocomposite was used for the fabrication of sensor surface by drop and cast method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Ana S Sacramento, Felismina T C Moreira, Joana L Guerreiro, Ana P Tavares, M Goreti F Sales
This work describes a novel approach to produce an antibody-like biomimetic material. It includes preparing composite imprinted material never presented before, with highly conductive support nanostructures and assembling a high conductivity polymeric layer at low temperature. Overall, such highly conductive material may enhance the final features of electrically-based devices. Acetylcholine (ACh) was selected as target analyte, a neurotransmitter of importance in Alzheimer's disease. Potentiometric transduction was preferred, allowing quick responses and future adaptation to point-of-care requirements...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Sujin Kim, Dawoon Jang, Joonwon Lim, Junghoon Oh, Sang Ouk Kim, Sungjin Park
Hybrid systems that molecule-based active species are combined with nanoscale materials may offer valuable routes to enhance the catalytic performances for electrocatalytic reactions. Development of rationally designed, cost-effective efficient catalysts for oxygen reduction reaction (ORR) is a crucial challenge for fuel cell and metal-air battery applications. In this work, we report a novel hybrid ORR catalyst material synthesized by a well-defined reaction pathway between Co-based organometallic molecules and N-doped multiwalled carbon nanotubes (MWCNT) at room temperature...
June 18, 2017: ChemSusChem
Asma Bensghaïer, Stephanie Lau-Truong, Mahamadou Seydou, Aazdine Lamouri, Eric Leroy, Matej Micusik, Klaudia Forro, Mohamed Beji, Jean Pinson, Maria Omastova, Mohamed Mehdi Chehimi
Tetrafluoroborate salts of diazotized Azure A (AA-N2+), Neutral Red (NR-N2+) and Congo Red (CR-N2+) dyes were prepared and reacted with multiwalled carbon nanotubes (MWCNTs) at room temperature, in water without any reducing agent. The as-modified MWCNTs were examined by IRATR, Raman spectroscopy, XPS, TGA, TEM and cyclic voltammetry. The diazonium band located at 2350 cm-1 in the diazotized dye IR spectra vanished after attachment to the nanotubes whilst Raman D/G peak ratio slightly increased after dye covalent attachment at high initial diazonium/CNT mass ratio...
June 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Lihua Hu, Zhongping Yang, Yaoguang Wang, Yan Li, Dawei Fan, Di Wu, Qin Wei, Bin Du
Water-soluble hyperbranched polyamine functionalized multiwalled carbon nanotubes nanocomposite (WHPA-OMCNT) was successfully prepared and applied to water remediation in this paper. WHPA-OMCNT was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), zeta potential, scanning electron microscopy (SEM) and transmission electron microscope (TEM) analyses. WHPA-OMCNT exhibited excellent adsorption performance for removal of organic dyes e.g., methylene blue (MB), malachite green (MG) and methyl violet (MV)...
June 15, 2017: Scientific Reports
Yulia Perets, Lyudmila Aleksandrovych, Mykola Melnychenko, Oleksandra Lazarenko, Lyudmila Vovchenko, Lyudmila Matzui
In the present work, we have investigated the concentration dependences of electrical conductivity of monopolymer composites with graphite nanoplatelets or multiwall carbon nanotubes and hybrid composites with both multiwall carbon nanotubes and graphite nanoplatelets. The latter filler was added to given systems in content of 0.24 vol%. The content of multiwall carbon nanotubes is varied from 0.03 to 4 vol%. Before incorporation into the epoxy resin, the graphite nanoplatelets were subjected to ultraviolet ozone treatment for 20 min...
December 2017: Nanoscale Research Letters
Vrushali Subhash Joshi, Jens Kreth, Dipankar Koley
Hydrogen peroxide (H2O2) is a highly relevant metabolite in many biological processes, including oral microbiome. To study this metabolite, we developed a 25 μm diameter, highly sensitive, non-enzymatic H2O2 sensor with a detection limit of 250 nM and a broad linear range of 250 nM to 7 mM. The sensor used the synergistic activity of the catalytically active Pt nanoparticles on a high surface area multiwall carbon nanotube and conducting ionic liquid matrix to achieve high sensitivity (2.4 ± 0.24 mA cm(-2) mM(-1)) for H2O2 oxidation...
June 14, 2017: Analytical Chemistry
Sudha Korwar, Michael Burkholder, Stanley E Gilliland, Kendra Brinkley, B Frank Gupton, Keith C Ellis
Chelation-directed C-H activation/C-C bond forming reactions utilizing homogeneous palladium(ii) and the Pd(ii)/Pd(iv) catalytic cycle have been previously reported. Here we report the first use of a solid-supported Pd(ii) catalyst [Pd(ii) nanoparticles on multiwalled carbon nanotubes, Pd(ii)/MWCNT] to carry out C-H activation/C-C bond forming reactions. The results presented demonstrate that the solid-supported Pd(ii)/MWCNT catalyst can effectively catalyze these arylation reactions using the Pd(ii)/Pd(iv) catalytic cycle...
June 14, 2017: Chemical Communications: Chem Comm
Jaewon Choi, Na Rae Kim, Kyungmi Lim, Kyojin Ku, Hyeon Ji Yoon, Jin Gu Kang, Kisuk Kang, Paul V Braun, Hyoung-Joon Jin, Young Soo Yun
Nanohybrid anode materials for Na-ion batteries (NIBs) based on conversion and/or alloying reactions can provide significantly improved energy and power characteristics, while suffering from low Coulombic efficiency and unfavorable voltage properties. An NIB paper-type nanohybrid anode (PNA) based on tin sulfide nanoparticles and acid-treated multiwalled carbon nanotubes is reported. In 1 m NaPF6 dissolved in diethylene glycol dimethyl ether as an electrolyte, the above PNA shows a high reversible capacity of ≈1200 mAh g(-1) and a large voltage plateau corresponding to a capacity of ≈550 mAh g(-1) in the low-voltage region of ≈0...
June 12, 2017: Small
Tinh Nguyen, Elijah J Petersen, Bastien Pellegrin, Justin M Gorham, Thomas Lam, Minhua Zhao, Lipiin Sung
Multiwall carbon nanotubes (MWCNTs) are nanofillers used in consumer and structural polymeric products to enhance a variety of properties. Under weathering, the polymer matrix will degrade and the nanofillers may be released from the products potentially impacting ecological or human health. In this study, we investigated the degradation of a 0.72 % (by mass) MWCNT/amine-cured epoxy nanocomposite irradiated with high intensity ultraviolet (UV) light at various doses, the effects of UV exposure on the surface accumulation and potential release of MWCNTs, and possible mechanisms for the release resistance of the MWCNT surface layer formed on nanocomposites by UV irradiation...
May 2017: Carbon
Rajasekhar Chokkareddy, Natesh Kumar Bhajanthri, Gan G Redhi
In this present work, a glassy carbon electrode (GCE) was modified primarily with multiwalled carbon nanotubes (MWCNTs) and a composite of MWCNTs and titanium oxide nanoparticles (TiO₂NPs). The enzyme horseradish peroxidase (HRP) was immobilized to enhance the sensing ability of GCE. The proposed biosensor was used for the sensitive determination of isoniazid (INZ) in various pharmaceutical samples. The electrochemical behaviour of the developed MWCNT-TiO₂NPs-HRP-GCE biosensor was studied by using cyclic voltammetry (CV) and differential pulse voltammetric (DPV) techniques...
June 5, 2017: Biosensors
R Ricci, N C S Leite, N S da-Silva, C Pacheco-Soares, R A Canevari, F R Marciano, T J Webster, A O Lobo
Graphene oxide nanoribbons (O-GNR) surges as an interesting nanomaterial for biomedical applications due to feasibility to incorporate functional groups and possible bactericidal properties. Herein, high concentrations of O-GNR were biologically evaluated using human osteoblast cells and gram positive and negative bacteria. Briefly, our goal were to evaluate: (1) synthetic pathway, (2) characterization and (3) effects of O-GNR composition and structural factors as a new approach for biomedical applications...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Pankaj Attri, Jitender Gaur, Sooho Choi, Minsup Kim, Rohit Bhatia, Naresh Kumar, Ji Hoon Park, Art E Cho, Eun Ha Choi, Weontae Lee
Most cancer cells have telomerase activity because they can express the human telomerase reverse transcriptase (hTERT) gene. Therefore, the inhibition of the hTERT expression can play an important role in controlling cancer cell proliferation. Our current study aims to inhibit hTERT expression. For this, we synthesized graphene oxide (GO) and a functionalized multiwall carbon nanotube (f-MWCNT), latter treated them with cold atmospheric pressure plasma for further analysis of the hTERT expression. The inhibition of hTERT expression by GO, f-MWCNT, plasma activated GO solution (PGOS), and plasma activated f-MWCNT solution (PCNTS), was studied using two lung cancer cell lines, A549 and H460...
June 1, 2017: Scientific Reports
Avishek Saha, Alicia Moya, Axel Kahnt, Daniel Iglesias, Silvia Marchesan, Reinhold Wannemacher, Maurizio Prato, Juan J Vilatela, Dirk M Guldi
A new insight into photoinduced charge transfer processes across carbon nanotube@TiO2 interfaces has been gained based on experimental details from transient absorption spectroscopy. We show that photoinduced, interfacial hole transfer to carboxylic acid-functionalized multiwalled carbon nanotubes (oxMWCNTs) from TiO2 results in hole-doped oxMWCNTs and reduced TiO2. The latter is inferred from femto- and nanosecond transient absorption spectroscopy performed with oxMWCNT@TiO2 dispersions and complemented with investigations using methyl viologen and N,N,N',N'-tetramethyl-p-phenylenediamine as an electron scavenger and a hole scavenger, respectively...
June 1, 2017: Nanoscale
H K L Johansson, J S Hansen, B Elfving, S P Lund, Z O Kyjovska, S Loft, K K Barfod, P Jackson, U Vogel, K S Hougaard
BACKGROUND: The use of multiwalled carbon nanotubes (MWCNT) is increasing due to a growing use in a variety of products across several industries. Thus, occupational exposure is also of increasing concern, particularly since airway exposure to MWCNTs can induce sustained pulmonary acute phase response and inflammation in experimental animals, which may affect female reproduction. This proof-of-principle study therefore aimed to investigate if lung exposure by intratracheal instillation of the MWCNT NM-400 would affect the estrous cycle and reproductive function in female mice...
May 30, 2017: Particle and Fibre Toxicology
Eunjoo Yoo, Haoshen Zhou
Li metal is an ideal anode for rechargeable Li-O2 batteries because of its large theoretical capacity (3860 mAh g(-1)). However, problems with the growth of dendrites and reaction with electrolytes and moisture during cycling have prevented its practical application. Herein, we report that the use of a 2 wt % N,N-dimethyltrifluoroacetamide (DMTFA) additive in a dimethyl sulfoxide (DMSO) electrolyte with a LiF layer on the Li anode allows for good cycling performance in Li-O2 batteries. Indeed, a Li-O2 cell with a multiwalled carbon nanotube (MWCNT) cathode, 1...
June 14, 2017: ACS Applied Materials & Interfaces
Chunxiang Li, Dan Zhang, Jiankang Wang, Pingan Hu, Zhaohua Jiang
A novel hybrid metallic cobalt insided in multiwalled carbon nanotubles/molybdenum disulfide (Co@CNT/MoS2) modified glass carbon electrode (GCE) was fabricated with a adhesive of Nafion suspension and used as chemical sensors for sulfide detection. Single-layered MoS2 was coated on CNTs through magnetic traction force between paramagnetic monolayer MoS2 and Co particles in CNTs. Co particles faciliated the collection of paramagnetic monolayer MoS2 exfoliated from bulk MoS2 in solution. Amperometric analysis, cycle voltammetry, cathodic stripping analysis and linear sweep voltammetry results showed the Co@CNT/MoS2 modified GCE exhibited excellent electrochemical activity to sulfide in buffer solutions, but amperometric analysis was found to be more sensitive than the other methods...
July 4, 2017: Analytica Chimica Acta
Zili Li, Miao Tang, Wei Bai, Ruke Bai
Carbon nanotubes can be used as promising reinforcement materials to improve the mechanical properties of hydrogels, but their poor dispersibility in aqueous solution severely limits their application in preparation of composite hydrogels. Therefore, to develop method for modification of carbon nanotubes is still highly desired. In this paper, a facile approach for preparation of the hydrophilic carbon nanotube was reported. The encapsulated multiwalled carbon nanotubes (E-CNT-PAA) with cross-linked shell structure were obatined through the self-assembly of the amphipathic azide diblock copolymers poly(acrylic acid)-b-poly(4-vinylbenzyl azide-co-styrene) (PAA-b-(PVBA-co-PS)), and the cross-linking of inside azide groups under UV irradiation...
June 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Hong Ke, Xin Zhang, Weiwei Guo, Amin Zhang, Zhiming Wang, Chusen Huang, Nengqin Jia
Electrochemiluminescent (ECL) assay has gradually drawn increasing interest to be considered as one of the potential strategies to be applicable in a wide range of medicine target determination. In this protocol, a facile and ultrasensitive ECL sensor platform was developed aiming at rapidly quantitative detection of polyphenolic flavonoids based on multiwall carbon nanotubes (MWCNTs)/platinum nanoparticles (PtNPs) nanohybrids/nafion/Ru(bpy)3(2+) modified glassy carbon electrode (GCE) in Ru(bpy)3(2+)/tri-n-propylamine (TPA) co-reaction system...
August 15, 2017: Talanta
Bharat P Dwivedee, Jayeeta Bhaumik, Shushil K Rai, Joydev K Laha, Uttam C Banerjee
The present work reports covalent immobilization of Pseudomonas fluorescens lipase (PFL) on functionalized multiwalled carbon nanotubes (MWCNTs) as a nanobiocatalyst (NBC). This nanobiocatalyst facilitates efficient kinetic resolution of (RS)-1-phenylethanol into (S)-1-phenylethanol [C=49.7%, eep=99.5%, ees=98.1% and E value=191.4]. The immobilized preparation (MWCNTs-PFL) showed ten-fold increase in activity, thermal stability upto 80 °C and recyclability (8 cycles). MWCNTs-PFL nanobioconjugate demonstrated better stability and enhanced activity compared to covalently immobilized PFL on other matrices (silver nanoparticles, gold nanoparticles and chitosan beads) used for the study...
September 2017: Bioresource Technology
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