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Browsing by Subject "Carbon nanotubes"

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Acute toxicity of double-walled carbon nanotubes to three aquatic organisms

Author: Lukhele, LP ; Mamba, BB ; Musee, N ; Wepener, V Date: Jan 2015 This study investigated the toxicity of double walled carbon nanotubes (DWCNTs) to three aquatic organisms, namely, Pseudokirchneriella subcapitata, Daphnia pulex, and Poecilia reticulata under the influence of exposuremedia properties ... Read more
Amine functionalization of carbon nanotubes for the preparation of CNT based polyactide composites - A comparative study

Author: Kesavan Pillai, Sreejarani ; Ramontja, J ; Ray, Suprakas S Date: Nov 2011 This work describes a comparison between two chemical functionalization strategies for the amine functionalization of carbon nanotubes (CNTs). In the first procedure, the CNTs are functionalized in direct amination process that avoids the use ... Read more
Carbon nanotubes based nafion composite membranes for fuel cell applications

Author: Cele, NP ; Ray, SS ; Kesavan Pillai, Sreejarani ; Ndwandwe, M ; Nonjola, S ; Sikhwivhilu, L ; Mathe, Mahlanyane K Date: 2009 Carbon nanotubes (CNTs) containing Nafion composite membranes were prepared via melt-blending at 250 °C. Using three different types of CNTs such as pure CNTs (pCNTs), oxidised CNTs (oCNTs) and amine functionalised CNTs (fCNTs); the effect ... Read more
Chemical vapour deposition of carbon nanotubes

Author: Arendse, CJ ; Malgas, GF ; Cummings, FR ; Cele, NP Date: Feb 2006 Carbon nanotubes (CNTs) have proven to show great promise in a wide variety of applications such as fabrication of strong composites, nano-scale electronic devices, electrochemical devices, power devices, to name a few. This is largely due ... Read more
Effect of mixture ratios and nitrogen carrier gas flow rates on the morphology of carbon nanotube structures grown by CVD

Author: Malgas, GF ; Arendse, CJ ; Cele, NP ; Cummings, FR Date: Feb 2008 This paper reports on the growth of carbon nanotubes (CNTs) by thermal Chemical Vapour Deposition (CVD) and investigates the effects of nitrogen carrier gas flow rates and mixture ratios on the morphology of CNTs on a silicon substrate by ... Read more
Effect of multiwalled carbon nanotube loading on the properties of Nafion(R) membranes

Author: Cele, NP ; Ray, SS Date: Oct 2015 The dispersion of carbon nanotubes is one of the problems in the application of polymer nanocomposites. In this study, the effect of chemical functionalization of the carbon nanotube surface on the dispersion of the tubes within a polymer is ... Read more
Effect of surface funcionalized carbon nanotubes on the morphology, as well as thermal, thermomechanical, and crystallization properties of polyactide

Author: Ramontja, J ; Ray, SS ; Kesavan Pillai, Sreejarani ; Luyt, AS Date: Jan 2011 This paper discusses various properties of Poly(lactide) upon nanocomposite formation with functionalized multiwalled carbon nanotubes (f-MWCNTs). The composite was prepared through melt extrusion technique. Functionalization of carbon nanotubes ... Read more
Electrochemical capacitors based on nitrogen-enriched cobalt (II) phthalocyanine/multi-walled carbon nanotube nanocomposites

Author: Lekitima, JN ; Ozoemena, KI ; Kobayashi, N Date: Nov 2013 A nitrogen-enriched metallophthalocyanine, Cobalt (II)tetrapyrazinoporphyrazine (CoTPyzPz), modified with acid or phenylamine functionalized multiwalled carbon nanotubes (MWCNTaf and MWCNTPhNH2) have been studied for application as an ... Read more
Enhanced performance of proton exchange membrane fuel cell by introducing nitrogen-doped CNTs in both catalyst layer and gas diffusion layer

Author: Hou, S ; Chi, B ; Liu, G ; Ren, Jianwei ; Song, H ; Liao, S Date: Nov 2017 The performance of the proton exchange membrane fuel cell (PEMFC) is significantly improved through introducing nitrogen-doped carbon nanotubes (NCNTs) into the catalyst layer (CL) and microporous layer (MPL) of the membrane electrode assembly ... Read more
Enhancing membrane electrode assembly performance by improving the porous structure and hydrophobicity of the cathode catalyst layer

Author: Chi, B ; Ye, Y ; Lu, X ; Jiang, S ; Du, L ; Zeng, J ; Ren, Jianwei ; Liao, S Date: Dec 2019 Enhancing membrane electrode assembly (MEA) performance is an ongoing pursuit in the drive to meet the increasing demand for fuel cell technology. In the present study, we utilize carbon nanotubes (CNTs) as porosity enhancers and polytetraf ... Read more
Field emission characteristics of SnO2/CNT composite prepared by microwave assisted wet impregnation

Author: Kesavan Pillai, Sreejarani ; Motshekga, SC ; Ray, SS ; Kennedy, J Date: 2012 SnO2/CNT composites were prepared by microwave assisted wet impregnation at 60 °C. The process was optimized by varying the microwave power and reaction time. Raman analysis showed the typical features of the rutile phase of as-synthesized ... Read more
Improving methane gas sensing properties of multi-walled carbonnanotubes by vanadium oxide filling

Author: Chimowa, George ; Tshabalala, Zamaswazi P ; Akande, Amos A ; Bepete, G ; Mwakikunga, Bonex W ; Ray, Suprakas S ; Benechada, EM Date: Aug 2017 Manipulation of electrical properties and hence gas sensing properties of multi-walled carbon nanotubes (MWNTs) by filling the inner wall with vanadium oxide is presented. Using a simple capillary technique, MWNTs are filled with vanadium ... Read more
In situ optical emission study on the role of C2 in the synthesis of singlewalled carbon nanotubes

Author: Motaung, DE ; Moodley, MK ; Manikandan, E ; Coville, NJ Date: 2010 Single-walled carbon nanotubes (SWCNTs) are unique one-dimensional nanostructure with extraordinary electronic, thermal, optical, and mechanical properties. These properties make SWCNTs suitable materials for a wide range of advanced technological ... Read more
Metal octacarboxyphthalocyanine / multi-walled carbon nanotube hybrid for the development of dye solar cells

Author: Mphahlele, N Date: Sep 2013 This study reports the successful synthesis and integration of metallo-octacarboxyphthalocyanines-multi-walled carbon nanotubes (MOCPc-MWCNTs) (M = Zn, Ga(OH) and Si(OH)2) hybrid system for the application of dye solar cells. The metal ... Read more
Microwave synthesis and characterisation of tin dioxide (SnO2) coated multi-walled carbon nanotubes

Author: Motshekga, S ; Kesavan Pillai, Sreejarani ; Ray, Suprakas S ; Krause, R ; Jalama, K Date: 01 Sep 2010 Metal nanoparticles coated onto carbon nanotubes (CNTs) provide a way to obtain novel materials with useful properties for gas sensing and catalyst application. Metal oxides are well-known materials suitable for detecting a wide spectrum of ... Read more
Nafion-based nanocomposite membranes for fuel cells

Author: Cele, NP ; Ray, SS ; Kesavan Pillai, Sreejarani ; Arendse, C ; Ndwandwe, N Date: Nov 2008 Nafion nanocomposites were prepared with pure multiwalled carbon nanotubes (PMWCNTs), oxidised MWCNTs (OMWCNTs) and functionalised MWCNTs (FMWCNTs) as fillers, to investigate the effect of multiwalled carbon nanotubes on thermal stability, ... Read more
Nanostructured nickel (II) phthalocyanine-MWCNTs as viable nanocomposite platform for electrocatalytic detection of asulam pesticide at neutral pH conditions

Author: Siswana, MP ; Ozoemena, KI ; Geraldo, DA ; Nyokong, T Date: Aug 2010 This work reports for the first time that nanostructured nickel (II) phthalocyanine/multiwalled carbon nanotubes composite supported on a basal plane pyrolytic electrode (NiPcNP/MWCNT-BPPGE) could potentially serve as a viable platform for ... Read more
Nickel(II) tetra-aminophthalocyanine modified MWCNTs as potential nanocomposite materials for the development of supercapacitors

Author: Chidembo, AT ; Ozoemena, KI ; Agboola, BO ; Gupta, V ; Wildgoose, GG ; Compton, RG Date: Nov 2010 The supercapacitive properties of nickel(II) tetraaminophthalocyanine(NiTAPc)/multi-walled carbon nanotube(MWCNT) nanocomposite films have been interrogated for the first time and found to possess a maximum specific capacitance of 981 ± 57 F ... Read more
One-step synthesis and characterization of CoS-Nanoparticles decorated multi-walled carbon nanotubes

Author: Kesavan Pillai, Sreejarani ; Moloto, N ; Ray, SS Date: Feb 2009 The organization of metal or semiconductor nanoparticles like quantum dots (QDs) on carbon nanotubes (CNTs) is one good example motivated by the desire to combine the properties of two functional nanoscale materials to achieve a wider range ... Read more
Optical and structural properties of multi-wall-carbonnanotube-modified ZnO synthesized at varying substrate temperatures for highly efficient light sensing devices

Author: Saasa, Valentine R ; Mokwena, M ; Dhonge, B ; Manikandan, E ; Kennedy, J ; Murmu, PP ; Dewar, J ; Erasmus, R ; Whaley, MF ; Mukwevho, E ; Mwakikunga, Bonex W Date: Dec 2015 Melanins are difficult to characterize because of their intractable chemical properties and the heterogeneity in their structural features. Melanin pigments, in fact, are composed of many different types of monomeric units that are connected ... Read more

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