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Alam, Mohammad K.,Rahman, Mohammed M.,Elzwawy, Amir,Torati, Sri Ramulu,Islam, Mohammad S.,Todo, Mitsugu,Asiri, Abdullah M.,Kim, Dojin,Kim, CheolGi Elsevier 2017 ELECTROCHIMICA ACTA Vol.241 No.-
<P><B>Abstract</B></P> <P>A facile and cost effective chemical reduction method is employed for the preparation of reduced graphene oxide/hydroxyapatite (rGO/HAp) nanocomposites. The transmission electron microscopy images revealed that the HAp flakes are well decorated on the surface of rGO. The morphological structure of the as-synthesized rGO/HAp nanocomposites was confirmed through X-ray diffraction, Fourier transform infrared spectroscopy and Raman spectroscopy, while the composition and thermal stability were analyzed by energy dispersive spectra and thermogravimetric analysis, respectively. Furthermore, the effect of rGO/HAp nanocomposites for the proliferation of Human Mesenchymal Stem Cell (hMSC) was performed to confirm the biocompatibility. A selective chemical sensor based on rGO/HAp modified glassy carbon electrode (GCE) for sensitive detection of Bis-phenol A (BPA) has been developed. Several important parameters controlling the performance of the BPA chemi-sensor were investigated and optimized at room conditions. The rGO/HAp/Nafion/GCE sensor offers a fast response and highly sensitive BPA detection. Under the optimal conditions, a linear range from 0.2nmolL<SUP>−1</SUP> to 2.0mmolL<SUP>−1</SUP> for the detection of BPA was observed with the detection limit of 60.0pmolL<SUP>−1</SUP> (signal-to-noise ratio, at an SNR of 3) and sensitivity of 18.98×10<SUP>4</SUP> μA.L/μmol.m<SUP>2</SUP>. Meanwhile, the fabricated chemi-sensor showed an excellent, specific and selective recognition to target BPA molecules among coexistence of other analytes in the buffer system. This novel effort initiated a well-organized way of efficient rGO/HAp/Nafion/GCE sensor development and practically analyzed the real hazardous environmental pollutants at room conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple chemical reduction method was used for preparation of reduced graphene oxide/hydroxyapatite (rGO/HAp) nanocomposites. </LI> <LI> The rGO/HAp nanocomposites exhibited good biocompatibility with hMSCs. </LI> <LI> Selective chemical sensor based on rGO/HAp nanocomposites was developed for detection of Bis-phenol A. </LI> <LI> The fabricated rGO/HAp/Nafion/GCE sensor exhibited good detection limit of 60pmolL<SUP>−1</SUP>. </LI> </UL> </P>
Abbas, Mohamed,Torati, Sri Ramulu,Rao, B. Parvatheeswara,Abdel-Hamed, M.O.,Kim, CheolGi Elsevier 2015 JOURNAL OF ALLOYS AND COMPOUNDS Vol.644 No.-
<P><B>Abstract</B></P> <P>Monodisperse Mn<I> <SUB>x</SUB> </I>Zn<SUB>1−</SUB> <I> <SUB>x</SUB> </I>Fe<SUB>2</SUB>O<SUB>4</SUB> (<I>x</I> =0.2, 0.5 and 0.8) nanoparticles have been synthesized using two different routes namely sonochemical and polyol methods, and the shape and size along with physiochemical properties of the nanoparticles were compared in detail. In both the routes, the synthesis was performed in a single reaction without the use of any surfactant and deoxygenated conditions. The reaction kinetics and surface adsorption characteristics of nanoparticles were observed by thermogravimetric analysis and Fourier transform infrared spectroscopy measurements. X-ray diffraction patterns confirmed the formation of a pure ferrite phase with cubic spinel structure, and the patterns further clearly indicate that the sonochemical method produces highly crystalline particles without any post calcination reaction, comparing with the polyol process. Transmission electron microscopy results reveal that the nanoparticles synthesized by polyol method are mostly aggregated and spherical in nature whereas the nanoparticles produced by sonochemical method are monodisperse large particles with cubic like shapes. The overall studies demonstrated that the sonochemical method is facile, reliable, rapid and very attractive for the aqueous synthesis of highly crystalline and high magnetic moment (84.5emu/g) monodisperse superparamagnetic Mn–Zn ferrite nanoparticles which considered as potential materials for various applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mn–Zn ferrite NPs were synthesized by two different methods are polyol and sonochemical. </LI> <LI> The sonochemical method produced NPs with high crystallinity than polyol method. </LI> <LI> The ferrite samples synthesized by sonochemical method showed high magnetization values and superparamagnetic properties. </LI> <LI> XRD, TEM, EDS, TGA, FTIR, and VSM techniques used to characterize the samples. </LI> </UL> </P>
D. KIM,Y. H. KIM,S. GURURAJA,M. RAMULU 한국자동차공학회 2010 International journal of automotive technology Vol.11 No.6
The random direction short Glass Fiber Reinforced Plastics (GFRP) have been prepared by two compression moulding processes, namely the Preform and Sheet Moulding Compound (SMC) processes. Cutting force analysis and surface characterization are conducted on the random direction short GFRPs with varying fiber contents (25~40%). Edge trimming experiments are preformed using carbide inserts with varing the depth of cut and cutting speed. Machining characteristics of the Preform and SMC processed random direction short GFRPs are evaluated in terms of cutting forces, surface quality, and tool wear. It is found that composite primary processing and fiber contents are major contributing factors influencing the cutting force magnitudes and surface textures. The SMC composites show better surface finish over the Preform composites due to less delamination and fiber pullouts. Moreover, matrix damage and fiber protrusions at the machined edge are reduced by increasing fiber content in the random direction short GFRP composites.