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Author: search.filters.author.Ramalakshmi VSubject: search.filters.subject.nanocomposites

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    IMPACT OF ENCAPSULATED METAL NANOPARTICLES ON POLYMER FUNCTIONALIZED GRAPHENE NANOCOMPOSITES FOR ITS SENSING APPLICATIONS
    (Centre for NanoScience and Technology, Institute of Science and Technology, Jawaharlal Nehru Technological University Hyderabad, Hyderabad, 2018-10-04) Balavijayalakshmi J; Ramalakshmi V
    The present work describes the synthesis of beta cyclodextrin functionalized silver nanoparticles encapsulated graphene oxide nanocomposite for the sensitive electrochemical detection of nitrophenol (NP) isomers. The functionalization and encapsulation of graphene oxide surface using beta cyclodextrin and silver nanoparticles are done by using chemical reduction of graphene oxide, beta cyclodextrin and silver nitrate chemical reagents. The physico-chemical properties of synthesized GO-CD-Ag nanocomposites are investigated using XRD, SEM, TEM and RAMAN analytical techniques [1]. The SEM and TEM morphological analysis confirms that the beta cyclodextrin molecules are effectively covered on the surface of graphene oxide nanosheets and also the silver nanoparticles are uniformly encapsulated on the surface of beta cyclodextrin functionalized graphene oxide nanosheets. The synthesized GO-CD-Ag nanocomposite modified GCE is employed for the sensitive detection of nitrophenol isomer such as para-nitrophenol (p-NP) and meta-nitrophenol (m-NP). The cyclic voltammetry studies show that the GO-CD-Ag nanocomposite modified GCE exhibits a good electrochemical behaviour for the reduction of p-NP and m-NP isomers in PBS solution [2]. The enhancement in the electrochemical behaviour of graphene oxide may be due to the host guest recognition properties of beta cyclodextrin and electronic properties of silver nanoparticles. The synthesized GO-CD-Ag nanocomposite modified electrochemical sensor exhibits the linear detection limits of 25 mm and 15 mm for p-NP and m-NP, respectively.
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    POLYMER FUNCTIONALIZED REDUCED GRAPHENE OXIDE BASED NICKEL NANOPARTICLES AS HIGHLY EFFICIENT DYE CATALYST FOR WATER REMEDIATION
    (International and Interuniversity Centre for Nanoscience and Nanotechnology (IIUCNN), Mahatma Gandhi University, Kottayam, Kerala, 2018-05-11) Ramalakshmi V; Balavijayalakshmi J
    The present work describes the synthesis and characterization of reduced graphene oxide based nickel nanoparticles containing beta cyclodextrin composite and its application for removal of textile dye from aqueous medium. For this purpose graphene oxide is produced by modified Hummer’s method, then after, GO-CD and GO-CD-Ni nanocomposites are synthesized via wet chemical method. The synthesized adsorbents (GO, GO-CD and GO-CD-Ni) are characterized using different characterization techniques such as FT-IR, XRD, FE-SEM. Also, the various parameters affecting dye removal like pH, contact time, amount of adsorbents and initial dye concentrations are investigated. The synthesized adsorbents exhibits excellent adsorption performance for the removal of textile dyes. The adsorption process is pH dependent and the adsorption capacity is increased with the increase in contact time and with that of adsorbent dosage.