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Browsing Journal Articles by Author "Ray, SS"

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The adsorption of Pb(sup2+) and Cu(sup2+) onto gum ghatti-grafted poly(acrylamide-co-acrylonitrile) biodegradable hydrogel: isotherms and kinetic models

Author: Mittal, H ; Maity, Arjun ; Ray, SS Date: Jan 2015 A biodegradable hydrogel polymer of gum ghatti (Gg) with a copolymer mixture of acrylamide (AAm) and acrylonitrile (AN) was synthesized using the free-radical graft copolymerization technique. The effect of graft copolymerization on the surface ... Read more
Annealing effect of hybrid solar cells based on poly (3-hexylthiophene) and zinc-oxide nanostructures

Author: Motaung, DE ; Malgas, GF ; Ray, SS ; Arendse, CJ Date: Jun 2013 The structural growth and optical and photovoltaic properties of the organic–inorganic hybrid structures of zinc oxide (ZnO)-nanorods/poly-3-hexylthiophene (P3HT) and two variations of organic polymer blends of ZnO/P3HT:C(sub60) fullerene and ... Read more
Biodegradation and bioresorption of poly(-caprolactone) nanocomposite scaffolds

Author: Mkhabela, V ; Ray, SS Date: Aug 2015 A new type of hybrid three-dimensional scaffolds was prepared using poly(caprolactone) (PCL) and chitosan-modified montmorillonite by solvent casting and particulate leaching method. The scaffolds were characterized by scanning electron ... 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
Catalytic Activity and Structure Properties of Doped VOHPO4 ·0.5H2O with Nanosized Ru, Au, Fe and Mn in Benzene Hydroxylation

Author: Makgwane, Peter R ; Ray, SS Date: 2013 The promotional effect of nanosized Ru, Fe, Au, and Mn particles on VOHPO(sub4) ·0.5H(sub2)O (VHP) catalytic properties was investigated in benzene hydroxylation reaction using hydrogen hydroperoxide (H(sub2)O(sub2) as oxidant. Catalytic ... Read more
Cellulose–polymer–Ag nanocomposite fibers for antibacterial fabrics/skin scaffolds

Author: Raghavendra, GM ; Jayaramudu, T ; Varaprasad, K ; Sadiku, R ; Ray, SS ; Raju, KM Date: Apr 2013 Natural carbohydrates (polysaccharides): gum acacia (GA) and gaur gum (GG) were employed in dilute solutions: 0.3%, 0.5% and 0.7% (w/v), as effective reductants for the green synthesis of silver nanoparticles (AgNPs) from AgNO3. The formed ... Read more
Chitosan-based nanocomposites

Author: Kesavan Pillai, Sreejarani ; Ray, SS Date: Aug 2012 In recent years, bio-nanocomposites, where biopolymers are formulated with fillers with nanometric dimensions, have raised great research interest because of the increasing demand of environmental friendly products. Due to the nanometer size ... Read more
Composite films of arabinoxylan and fibrous sepiolite: Morphological, mechanical, and barrier properties

Author: Sarossy, Z ; Blomfeldt, TOJ ; Hedenqvist, MS ; Koch, CB ; Ray, SS ; Plackett, D Date: Jun 2012 Hemicelluloses represent a largely unutilized resource for future bioderived films in packaging and other applications. However, improvement of film properties is needed in order to transfer this potential into reality. In this context, ... Read more
Controlled dual release study of curcumin and a 4-aminoquinoline analog from gum acacia containing hydrogels

Author: Aderibigbe, BA ; Sadiku, ER ; Jayaramudu, J ; Ray, SS Date: Oct 2014 The potential of gum acacia containing hydrogels as controlled dual-drug delivery systems for antiprotozoal agents was investigated. 4-Aminoquinoline analog and curcumin were selected as model drugs because they exhibit antiprotozoal activity. ... Read more
Conventional wet impregnation versus microwave-assisted synthesis of SnO2/CNT composites

Author: Motshekga, S ; Kesavan Pillai, Sreejarani ; Ray, SS Date: Mar 2011 Carbon nanotubes decorated with SnO2 nanoparticles were prepared by conventional and microwave-assisted wet impregnation. The composites were thoroughly characterized by X-ray diffraction, Raman spectroscopy, BET-surface area measurement, ... Read more
Defect-induced magnetism in undoped and Mn-doped wide band gapzinc oxide grown by aerosol spray pyrolysis

Author: Motaung, DE ; Kortidis, I ; Papadaki, D ; Nkosi, SS ; Mhlongo, Gugu H ; Wesley-Smith, J ; Malgas, GF ; Mwakikunga, Bonex W ; Coetsee, E ; Swart, HC ; Kiriakidis, G ; Ray, SS Date: Aug 2014 We present a systemic study on the structural, optical and magnetic properties of the un-doped and Mn doped ZnO thin films grown by aerosol spray pyrolysis at different deposition times. XRD profilinghas shown that the structures of the ... Read more
Determination of structural changes of dispersed clay platelets in a polymer blend during solid-state rheological property measurement by small-angle X-ray scattering

Author: Bandyopadhyay, J ; Ray, SS Date: May 2011 The poly(ethylene terephthalate)/thermotropic liquid crystal polymer (weight ratio 80:20) blend composites with two different weight percentages of nanoclay were prepared using a twin-screw extruder. The frequency sweep experiments at a ... Read more
Development of a high-performance nanostructured V(sub2)O(sub5)/SnO(sub2)catalyst for efficient benzene hydroxylation

Author: Makgwane, Peter R ; Ray, SS Date: Feb 2015 Nanostructured vanadium-tin oxide (V(sub2)O(sub5)/SnO(sub2)) catalysts with V(sub2)O(sub5) loading in a range of 5–20 wt% have been synthesized. The V(sub2)O(sub5)/SnO(sub2) nanostructures exhibited effective catalytic performance in the ... Read more
Development of a reduced-graphene-oxide based superparamagnetic nanocomposite for the removal of nickel (II) from an aqueous medium via a fluorescence sensor platform

Author: Nandi, D ; Saha, I ; Ray, SS ; Maity, Arjun Date: Sep 2015 Reduced-graphene-oxide based superparamagnetic nanocomposite (GC) was fabricated and applied for the remediation of Ni(II) from an aqueous medium. The as-prepared GC was extensively characterized by Raman, TEM, AFM, SEM–EDX, SQUID, and BET ... Read more
Development of antifungal films based on low-density polyethylene and thyme oil for avocado packaging

Author: Kesavan Pillai, Sreejarani ; Maubane, L ; Ray, SS ; Khumalo, V ; Bill, M ; Sivakumar, D Date: Oct 2015 Trilayer low-density polyethylene (LDPE) films were prepared by incorporating varying concentrations of thyme oil, as the antifungal active additive for avocado packaging. A comprehensive thermal, structural, mechanical, and functional ... 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 nanoclay on optical properties of PLA/clay composite films

Author: Cele, HM ; Ojijo, Vincent O ; Chen, H ; Kumar, S ; Land, K ; Joubert, T ; De Villiers, MFR ; Ray, SS Date: Jun 2014 This article reports the modification of optical properties of biodegradable/biocompatible polylactide (PLA) using organically modified montmorillonite (OMMT) for microcantilever applications. PLA/OMMT composite films with various OMMT loadings ... Read more
Effect of organoclay on the orientation and thermal properties of liquid-crystalline polymers

Author: Bandyopadhyay, J ; Ray, SS ; Bousmina, M Date: Aug 2007 The preparation and thermal and thermo-mechanical properties of nanocomposites based on liquid-crystalline polymers (LCP) and organically-modified layered silicate (OMLS) is described. From XRD patterns, very little smectic ordering is present ... Read more
Effective removal of cationic dyes from aqueous solution using gum ghatti-based biodegradable hydrogel

Author: Mittal, H ; Maity, Arjun ; Ray, SS Date: Aug 2015 Biodegradable hydrogels of gum ghatti (Gg) with a co-polymer mixture of acrylamide (AAm) and methacrylic acid (MAA) (termed as Gg-cl-P(AAm-co-MAA)) were synthesised by microwave-assisted free radical graft co-polymerisation technique. The ... Read more
Efficient room temperature oxidation of cyclohexane over highly active hetero-mixed WO3/V2O5 oxide catalyst

Author: Makgwane, Peter R ; Ray, SS Date: Sep 2014 An efficient room temperature catalyzed oxidation of cyclohexane to cyclohexanone (K) and cyclohexanol (A) was achieved over hetero-mixed tungsten–vanadia (WO(sub3)/V(sub2)O(sub5)) using H(sub2)O(sub2) oxidant. WO(sub3)/V(sub2)O(sub5) exhibited ... Read more

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