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Multiwall carbon nanotubes

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...
May 11, 2017: Bioresource Technology
Bhim Bali Prasad, Purnendu Kumar Pathak
A new ultra sensing molecularly imprinted polymer beads modified pencil graphite electrode was fabricated, with the help of the inverse suspension polymerization technique, for ascertaining the adequate supplementation of dacarbazine in the cancer treatment. The inverse suspension polymerization technique was beneficial in obtaining surface imprinted polymer-based electrocatalytic nanospheres with narrow size distribution. These nanospheres were found to be superior to the corresponding microspheres and planar films, in terms of electrode kinetics and sensitivity, with the differential pulse anodic stripping voltammetric transduction...
June 29, 2017: Analytica Chimica Acta
Vedran Milosavljevic, Ludmila Krejcova, Roman Guran, Hana Buchtelova, Dorota Wawrzak, Lukas Richtera, Zbynek Heger, Pavel Kopel, Vojtech Adam
Multiwall carbon nanotubes (MWCNTs) are among the frequently studied carbon materials, particularly because of their physical and chemical properties and high potential for application in materials chemistry, industry, and medicine. MWCNTs are very promising as transporters of bioactive molecules because of their π electrons and large surface area, which can be easily modified, mostly by the application of inorganic acids for the introduction of carboxylic moieties on the surface. In the present study, we designed an oxidised MWCNTs (oMWCNTs) transporter for the targeted delivery of doxorubicin (Dox)...
May 3, 2017: Colloids and Surfaces. B, Biointerfaces
Shiuh-Chuan Her, Kuan-Yu Lin
BACKGROUND: To predict the mechanical properties of multiwalled carbon nanotube (MWCNT)-reinforced polymers, it is necessary to understand the role of the nanotube-polymer interface with regard to load transfer and the formation of the interphase region. The main objective of this study was to explore and attempt to clarify the reinforcement mechanisms of MWCNTs in epoxy matrix. METHODS: Nanocomposites were fabricated by adding different amounts of MWCNTs to epoxy resin...
May 18, 2017: Journal of Applied Biomaterials & Functional Materials
Ali Kamal Attia, Nisreen Farouk Abo-Talib, Marwa Hosny Tammam
Purpose: A new sensitive sensor was fabricated for the determination of ivabradine hydrochloride (IH) based on modification with multiwalled carbon nanotubes using sodium dodecyl sulfate as micellar medium to increase the sensitivity. Methods: The electrochemical behavior of IH was studied in Britton-Robinson buffer (pH: 2.0-11.0) using cyclic and differential pulse voltammetry. Results: The voltammetric response was linear over the range of 3.984 x 10(-6)-3.475 x 10(-5) mol L(-1). The limits of detection and quantification were found to be 5...
April 2017: Advanced Pharmaceutical Bulletin
Shadpour Mallakpour, Shima Rashidimoghadam
In the present study, the surface of multiwalled carbon nanotubes (MWCNT)s is modified by ascorbic acid (AA) (vitaminC) for their dispersion improvement in the starch matrix. Then, the starch-based nanocomposites (NCs) containing 3, 6 and 9wt% of AS modified MWCNTs (AA-MWCNT)s were fabricated via ultrasonication method. Characterization of the prepared NCs was accomplished by different techniques. The optimum MWCNT content for the generation of fine electrical conductivity was found to be about 3wt%, indicating better dispersion of AA-MWCNT with low amount of AA-MWCNT...
August 1, 2017: Carbohydrate Polymers
Cecilia M Peralta, Cecilia Henestrosa, Raúl A Gil, Liliana P Fernández, Gimena Acosta
A new green on-line method for Boldine determination (BOL) in herbal drugs and phytopharmaceuticals, using its native fluorescence in acid media (λex=282nm; λem=373nm) has been developed. The presented methodology involves for the first time, a flow injection (FI) strategy using a mini-column of multiwalled carbon nanotubes as retention agent coupled with molecular fluorescence. Different parameters influence as sample pH and flow rate, eluent flow rate and composition; on BOL sensitivity and elution time was investigated by multifactorial techniques...
April 21, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Apinya Puangjan, Suwan Chaiyasith, Wipawee Taweeporngitgul, Jeerunda Keawtep
A new electrochemical sensor was fabricated from chemically functionalized multiwall carbon nanotubes and electrochemically deposited cuprous oxide and silver oxide composite over the nanotubes on copper substrate. The structural, functional, morphological, electrical properties and elemental composition of the composite were characterized by X-ray diffractometry, Fourier transform infrared spectroscopy, field transmission electron microscopy, electrochemical impedance spectroscopy and energy dispersive X-ray spectroscopy...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Viswanathan Karthika, Ayyakannu Arumugam
A novel combination of titanium oxide (TiO2)/gold (Au)/multiwalled carbon nanotubes (MWCNTs) nanocomposite (NC) was synthesised by sol- gel method. MWCNT functionalisation by modified Hummers method. TiO2/Au nanoparticles (NPs) were synthesised by biological method using Terminalia chebula bark extract. MWCNT/TiO2/Au NC samples were characterised by X-ray diffraction, ultraviolet-visible-diffuse reflectance spectra, microRaman, scanning electron microscopy and high-resolution-transmission electron microscopy analyses...
February 2017: IET Nanobiotechnology
Elias E Elemike, Omolola E Fayemi, Anthony C Ekennia, Damian C Onwudiwe, Eno E Ebenso
Synthesis of metallic and semiconductor nanoparticles through physical and chemical routes has been extensively reported. However, green synthesized metal nanoparticles are currently in the limelight due to the simplicity, cost-effectiveness and eco-friendliness of their synthesis. This study explored the use of aqueous leaf extract of Costus afer in the synthesis of silver nanoparticles (CA-AgNPs). The optical and structural properties of the resulting silver nanoparticles were studied using UV-visible spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infra-red spectrophotometer (FTIR)...
April 29, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Reyhan Sengur-Tasdemir, V R S S Mokkapati, Derya Y Koseoglu-Imer, Ismail Koyuncu
MWCNTs (Multi-walled carbon nanotubes) can be used for the fabrication of mixed matrix polymeric membranes that can enhance filtration perfomances of the membranes by modifying membrane surface properties. In this study, detailed characterization and filtration performances of MWCNTs functionalized with COOH group, blended into polymeric flat-sheet membranes were investigated using different polymer types. Morphological characterization was carried out using AFM, SEM and contact angle measurements. For filtration performance tests, protein, dextran, E...
May 2, 2017: Environmental Technology
Kinsuk Das, A P Madhusoodan, Bhabesh Mili, Ajay Kumar, A C Saxena, Kuldeep Kumar, Mihir Sarkar, Praveen Singh, Sameer Srivastava, Sadhan Bag
In the field of regenerative medicine, numerous potential applications of mesenchymal stem cells (MSCs) can be envisaged, due to their ability to differentiate into a range of tissues on the basis of the substrate on which they grow. With the advances in nanotechnology, carbon nanotubes (CNTs) have been widely explored for use as cell culture substrate in tissue engineering applications. In this study, canine bone marrow-derived MSCs were considered as the cellular model for an in vitro study to elucidate the collective cellular processes, using three different varieties of thin films of functionalized carbon nanotubes (COOH-single-walled CNTs [SWCNTs], COOH-multiwalled CNTs [MWCNTs] and polyethylene glycol [PEG]-SWCNTs), which were spray dried onto preheated cover slips...
2017: International Journal of Nanomedicine
Xia Zhao, Bo Yu, Junping Zhang
Although thousands of superhydrophobic coatings have been reported, transparent ones with high durability are rare. Here, transparent and durable superhydrophobic coatings were prepared by using multiwalled carbon nanotubes (MWCNTs) as the templates. The superhydrophobic coatings were prepared by spray-coating the homogeneous suspension of polysiloxane-modified MWCNTs (MWCNTs@POS) in toluene onto glass slides, calcination in air at 500°C to form the silica nanotubes (SNTs), and then chemical vapor deposition of polydimethylsiloxane at 200°C onto the surface of the SNTs coatings...
April 21, 2017: Journal of Colloid and Interface Science
Gayan Premaratne, Sabrina Farias, Sadagopan Krishnan
Measurement of ultra-low (e.g., parts-per-billion) levels of small-molecule markers in body fluids (e.g., serum, urine, saliva) involves a considerable challenge in view of designing assay strategies with sensitivity and selectivity. Herein we report for the first time an amperometric nano-bioelectrode design that uniquely combines 1-pyrenebutyric acid units pi-pi stacked with carboxylated multiwalled carbon nanotubes on the surface of gold screen printed electrodes for covalent attachment of NAD(+) dependent formaldehyde dehydrogenase (FDH)...
June 1, 2017: Analytica Chimica Acta
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
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