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Browsing by Author "Ray, Suprakas S"

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Ab initio studies of vacancies in (8,0) and (8,8) single-walled carbon and boron nitride nanotubes

Author: Mashapa, MG ; Chetty, N ; Ray, Suprakas S Date: Sep 2012 A systematic study of vacancies in single-walled carbon nanotubes and boron nitride nanotubes was carried out. First principles calculations within the framework of density functional theory using the CASTEP code are used to optimize fully ... Read more
Acetyl salicylic acid–ZnAl layered double hydroxide functional nanohybrid for skin care application

Author: Mosangi, Damodar ; Moyo, Lumbidzani ; Kesavan Pillai, Sreejarani ; Ray, Suprakas S Date: Oct 2016 In this study, a pharmaceutically active ingredient, acetyl salicylic acid (ASA), was intercalated into ZnAl layered double hydroxide (LDH). The LDH–ASA nanohybrid material was characterized by XRD, FTIR, SEM, ICP-MS, TEM and TGA. Successful ... Read more c b
Achieving Controllable MoS2 Nanostructures with Increased Interlayer Spacing for Efficient Removal of Pb(II) from Aquatic Systems

Author: Kumar, Neeraj ; Fosso-Kankeu, E ; Ray, Suprakas S Date: May 2019 The development of new synthesis approaches for MoS2 is necessary to achieve controlled morphologies and unique physicochemical properties that can improve its efficiency in particular applications. Herein, a facile one-step hydrothermal route ... Read more
Active nanocomposite films based on low density polyethylene/organically modified layered bouble hydroxides/thyme oil to retain retail shelf life and quality of hass avocados

Author: Kesavan Pillai, Sreejarani ; Sivakumar, D ; Ray, Suprakas S ; Obianom, P ; Eggers, Sharon K ; Mhlabeni, T Date: Dec 2020 In this study, the ability of an active film containing volatile bioactives in post-harvest disease control and preservation of quality in avocados is explored as a non-traditional treatment method. Antimicrobial transparent flexible trilayer ... Read more
Adsorption of methyl violet from aqueous solution using gum xanthan/Fe3O4 based nanocomposite hydrogel

Author: Mittal, H ; Kumar, V ; Saruchi ; Ray, Suprakas S Date: Aug 2016 This research paper reports the utilization of gum xanthan-grafted-polyacrylic acid and Fe(sub3)O(sub4) magnetic nanoparticles based nanocomposite hydrogel (NCH) for the highly effective adsorption of methyl violet (MV) from aqueous solution. ... Read more
Advances in nanostructured metal-encapsulated porous organic-polymer composites for catalyzed organic chemical synthesis

Author: Sebati, Ngwanamohuba W ; Ray, Suprakas S Date: Oct 2018 Porous organic polymers (POPs) are of growing research interest owing to their high surface areas, stabilities, controllable chemical configurations, and tunable pore volumes. The molecular nanoarchitecture of POP provides metal or metal oxide ... 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
Anomalous impact strength for layered double hydroxide-palmitate/poly(e-caprolactone) nanocomposites

Author: Moyo, Lumbidzani ; Makhado, E ; Ray, Suprakas S Date: Nov 2014 Inherent physical properties and commercial availability makes poly(e-caprolactone) (PCL) very attractive as a potential substitute material for nondegradable polymers for commodity applications. However, a balance of toughness and stiffness ... Read more
Apoptotic efficacy of multifaceted biosynthesized silver nanoparticles on human adenocarcinoma cells

Author: George, BPA ; Kumar, Neeraj ; Abrahamse, H ; Ray, Suprakas S Date: Sep 2018 Metallic nanoparticles (NPs) especially silver (Ag) NPs have shown immense potential in medical applications due to their distinctive physio-chemical and biological properties. This article reports the conjugation of Ag NPs with Rubus ... Read more
Application of cross-linked soy protein isolate with resorcinol films for release studies of naturally occurring bioactive agent with antiproliferative activity

Author: Siva Mohan Reddy, G ; Jayaramudu, J ; Sadiku, ER ; Ray, Suprakas S ; Varaprasad, K ; Aderibigbe, BA Date: 2014 The potential of soy protein isolate films as a release system for naturally occurring antiproliferative agent was investigated. The soy protein isolates was cross linked with resorcinol and the resorcinol content was varied between 10-30 %. ... Read more
Applications of nanoclay-containing polymer nanocomposites

Author: Bandyopadhyay, J ; Ray, Suprakas S Date: Jul 2017 In 1989, a report from the Toyota Central Research and Development Laboratory on the synthesis of nanoclay-containing polymide nanocomposites using in situ polymerization opened a new era for polymer nanocomposites (PNCs). PNCs provide several ... Read more
Bionanocomposite hydrogel for the adsorption of dye and reusability of generated waste for the photodegradation of Ciprofloxacin: A demonstration of the circularity concept for water purification

Author: Kumar, Neeraj ; Mittal, H ; Alhassan, SM ; Ray, Suprakas S Date: 2018 Adsorption has emerged as a simple and economical approach to water decontamination; however, it creates large amounts of secondary toxic waste following the removal of the effluents from the water. The present investigation introduces an ... Read more
Blue- and red-shifts of V2O5 phonons in NH3 environment by in situ Raman spectroscopy

Author: Akande, Amos A ; Machatine, AGJ ; Masina, Bathusile N ; Chimowa, G ; Matsoso, B ; Roro, Kittessa T ; Duvenhage, M-M ; Swart, H ; Bandyopadhyay, J ; Ray, Suprakas S ; Mwakikunga, Bonex W Date: Jan 2018 A layer of ~30 nm V2O5/100 nm-SiO2 on Si was employed in the in situ Raman spectroscopy in the presence of NH3 effluent from a thermal decomposition of ammonium acetate salt with the salt heated at 100 °C. When the layer is placed at 25 °C, ... Read more
A brief overview of layered silicates and polymer/layered silicate nanocomposite formation

Author: Ray, Suprakas S ; Ojijo, Vincent O Date: Feb 2018 Layered silicate-containing polymer nanocomposites attract great interest in today’s advanced composite materials research because it is possible to achieve impressive property improvements when compared with neat polymers or conventional ... Read more
Carbon nanomaterial-based adsorbents for water purification: Fundamentals and applications

Author: Ray, Suprakas S ; Gusain, Rashi ; Kumar, Neeraj Date: Jun 2020 The deterioration of water quality and unavailability of drinkable water are pressing challenges worldwide. The removal of toxic organic and inorganic pollutants from water is vital for a clean environment, as a response to water scarcity. ... Read more
Characterisation and thermal properties of titanium dioxide nanoparticles-containing biodegradable polylactide composites synthesized by sol–gel method

Author: Mhlanga, N ; Ray, Suprakas S Date: 2014 This study reports the synthesis, characterisation and thermal properties of polylactide (PLA)/titanium dioxide nanoparticles (TiO(sub2) NPs) composites using the sol–gel method. The percentage weight of TiO(sub2) NP sol was varied from 3, ... Read more
Characteristics of point defects on the room temperature ferromagnetic and highly NO2 selectivity gas sensing of p-type Mn3O4 nanorods

Author: Kortidis, Ioannis ; Swart, HC ; Ray, Suprakas S ; Motaung, David E Date: Apr 2019 This study investigates the room temperature (RT) gas-sensing and ferromagnetic behavior of p-type materials based on a comparison of NiO, Mn3O4, and CuO nanostructures prepared using a hydrothermal method. The Mn3O4 nanorods based sensor ... Read more
Characterization and in vitro release kinetics of antimalarials from whey protein-based hydrogel biocomposites

Author: Owonubi, SJ ; Aderibigbe, BA ; Mukwevho, E ; Sadiku, ER ; Ray, Suprakas S Date: Mar 2018 In this research, hydrogel biocomposites were prepared from whey protein isolate (WPI), reduced graphene oxide (rGO), and synthetic polymers in varied ratios. Their physicochemical properties were evaluated by FTIR, SEM, TGA, AFM, and TEM. ... Read more
Characterization of polypropylene/polystyrene boehmite alumina nanocomposites: Impact of filler surface modification on the mechanical, thermal, and rheological properties

Author: Malwela, Thomas ; Khumalo, VM ; Salehiyan, Reza ; Ray, Suprakas S Date: Jul 2018 The influences of surface treatment and the concentration of boehmite alumina (BA) particles on polypropylene and polystyrene (PS) (80/20) blends produced via melt compounding were examined. The results show that p-toluene sulfonic acid-treated ... Read more
Characterization of pre-gelatinized maize starch-zein blend films produced at alkaline pH

Author: Teklehaimanot, WH ; Ray, Suprakas S ; Emmambux, MN Date: Sep 2020 Biodegradable materials are considered as alternative to synthetic materials to alleviate the environmental burdens caused by petroleum based synthetic materials. Biopolymer blends have been extensively researched to improve the material ... Read more

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