Open Access Original Research Article

Corrosion Inhibition and Adsorption Characteristics of Myrianthus arboreus Leaves Extract on Copper in Sulphuric Acid Solution

G. I. Udom, G. A. Cookey, A. A. Abia

Chemical Science International Journal, Page 1-13
DOI: 10.9734/CSJI/2018/41304

The inhibiting action of Myrianthus arboreus leaves extract on the corrosion of copper in sulphuric acid solution was assessed using weight loss method at various temperatures. It was observed that the extract inhibited the acid-induced corrosion of copper and the corrosion rate decreased in the presence of the inhibitor as compared to the blank. Inhibition efficiency was found to increase with increasing concentration of the extract and temperature. Kinetic study of the data followed a first-order reaction. Thermodynamics study revealed that the corrosion inhibition might be due to spontaneous adsorption of the leaves constituents on the metal surface. The adsorption of the extract on copper surface was found to obey Freundlich and Temkin adsorption isotherms.

Open Access Original Research Article

Halloysite Nanoclay Polymer Composite: Synthesis, Characterization and Effect on Water Retention Behaviour of Soil

Priyal Pandey, Giriraj ., Nirmal De

Chemical Science International Journal, Page 1-11
DOI: 10.9734/CSJI/2018/42613

Going with the theme of more crops per drop, halloysite nanotube polymer composites superabsorbent is synthesized for promotion of rain fed agriculture. The synthesized composites were characterized by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Effect of graded percentage of halloysite nanoclay addition with respect to water sorption of composites has been studied along with its effect on water retention behaviour of soil. Peak of halloysite nano tube diminishes at 7.72 Ao and broadens at 4.45Ao after polymerization reaction indicating both internal and external surface of clay had been involved in polymerization reaction. Porous morphology of superabsorbent has been confirmed by SEM. Addition of halloysite nanoclay during polymerization reaction has increased water sorption capacity of polymer composites. Maximum water sorption was observed in composites with 7% clay loading. Polymer composite treated soil has 4% to 6% more available water and higher soil moisture regime as compared to control (untreated) soil.

Open Access Original Research Article

Synthesis and Investigation of Magnesium Stearate with Coordinated Compounds with Acetamide and Nicotineamide

Dilshod Sottorjonovich Kholmatov

Chemical Science International Journal, Page 1-6
DOI: 10.9734/CSJI/2018/42580

Homogenous coordination compounds of magnesium stearate with acetamide and nicotinamide were synthesized. Composition, individuality, methods of acetamide, nicotinamide molecules and stearate fragments coordination of coordinated compounds were established. In addition, thermal behavior of produced complexes was studied. IR-spectrum of absorption and X-ray phase analysis methods were used to prove of formation of chemical bonds and thermolysis for the definition of composition and individuality of newly synthesized compounds.

Open Access Original Research Article

In Vitro Evaluation of Antioxidant and Anti-inflammatory Properties of Methanol and Dichloromethane Extracts of the Leaf of Globimetula oreophila

Esther O. Faboro, Idowu J. Olawuni, Bolajoko A. Akinpelu, Oluokun O. Oyedapo, Ezekiel O. Iwalewa, Craig A. Obafemi

Chemical Science International Journal, Page 1-15
DOI: 10.9734/CSJI/2018/42051

Aims: The study was designed to investigate the antioxidant and membrane stabilizing potentials of the leaf of Globimetula oreophila, with a view to providing scientific support for the acclaimed ethnomedicinal or traditional uses of the plant.

Methodology: The study involved collection, identification, drying, pulverizing, extraction and fractionation of extracts of the dried leaves of G. oreophila. Anti-inflammatory and antioxidant activities of the extracts and fractions were evaluated using red blood cell membrane stabilization technique, while assays (2,2-diphenyl-1-picrylhydrazyl hydrate, nitric oxide, total antioxidant capacity and ferric reducing antioxidant power).

Results: The results revealed that the extracts and the fractions of G. oreophila exhibited potent antioxidant activities. Fraction 1 of the methanol extract exhibited the highest antioxidant activity with IC50 of 45.83 ± 0.13 µg/ml while fraction 7 of the same extract was the most potent in stabilizing stressed red blood cells having 100±0.00% membrane stability. The activities of both the fractions and the extracts of G. oreophila compared favourably with the standard antioxidant and anti-inflammatory drugs. Moreover, the activities of the fractions and extracts are concentration dependent.

Conclusion: The study revealed that the extracts and fractions of G. oreophila possess and exhibit anti-inflammatory and antioxidant activities which were concentration dependent and compared favourably with those of nonsteroidal anti-inflammatory drugs.

Open Access Review Article

A Review in Graphene/Polymer Composites

Bhavana M. Itapu

Chemical Science International Journal, Page 1-16
DOI: 10.9734/CSJI/2018/41031

This review article reports recent advances in graphene/polymer-based composites. Graphene is a potential nanofiller that can dramatically improve the properties of polymer-based composites at very low loading. Various new techniques such as solution processing, in-situ polymerization, and melt intercalation along with new polymer/graphene composites are discussed.  Modification of polymer materials by inducing graphene is widely reported in this article. The graphene/polymer-based composites exhibit renewed properties such as adsorption, anti-bacterial, hydrophobicity and electrical and thermal conductivity. With the integration and miniaturization of electronic devices, thermal management has become a crucial issue and hence graphene/polymer-based composites have gained a significant attention in recent years. Different thermal conduction mechanisms with respect to graphene and polymer, graphene/polymer composites have been investigated for electronic, sensing and electromagnetic interference/shielding applications. The assembly techniques available for effectively incorporating graphene/polymer flexible composites by utilizing weak and strong interfacial interactions are summarized. Finally, this report provides a roadmap for the synthesis of new polymers compatible with graphene.