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  • New Applications of Nanomaterials

  • Noi aplicatii ale unor nanomateriale

  • New Applications of Nanomaterials

    EDITORS:

    Alina Catrinel Ion, Dan Dascalu, Gabriela Carja, Magdalena Lidia Cirea

    EDITURA ACADEMIEI ROMNE

    Bucureti, 2014

  • Copyright Editura Academiei Romne, 2014. All rights reserved.

    The responsibility for originality and the contents of the articles lies exclusively with the authors.

    Address: EDITURA ACADEMIEI ROMNE Calea 13 Septembrie nr. 13, sector 5, 050 711, Bucureti, Romnia, Tel. 4021-3188146, 4021-3188106 Fax: 4021-3182444 E-mail: edacad@ear.ro Internet: http://www.ear.ro

    Peer reviewers: Prof. Gheorghe Brezeanu, Dr. Mihai Mihail, m.c. al Academiei Romniei

    Descrierea CIP a Bibliotecii Nationale a Romniei New applications of nanomaterials / editors:

    Alina Catrinel Ion, Dan Dascalu, Gabriela Carja, Magdalena Lidia Cirea - Bucureti : Editura Academiei Romne, 2014 ISBN 978-973-27-2311-1

    I. Alina Catrinel Ion (ed.) II. Dan Dascalu (ed) III. Gabriela Carja (ed.) IV. Magdalena Lidia Cirea (ed.) 621.3.049.77

    Editorial assistant: Mihaela Marian Computer operator: Elena Tric Cover: Elena Tric

    Passed for press: 03.2014. Size: 16 / 70 100. Printed sheets: 9 D.L.C. for large libraries: 621.3.049.77 D.L.C. for small libraries: 621.3

  • CONTENTS

    FOREWORD ........................................................................................................................... 7 AuNPs/LDHS ASSEMBLIES AS NANOARCHITECTURES: FABRICATION, PROPERTIES AND SPECIFIC APPLICATION AS PHOTOCATALYSTS

    M. BIRSANU, D. MARDARE, M. PUSCASU, K. OKADA, G. CARJA ........................... 9 A NEW NANOMATERIAL FOR THE STUDY OF PROTEIN INTERACTIONS

    A. VASILESCU, I. MIHAIA, A. VEZEANU, V. ANDREI, G. NEDELCU E. POPA, C. PURCAREA, P. SUBRAMANIAN, Y. COFFINIER, R. BOUKHEROUB, S. SZUNERITS .. 19

    ENVIRONMENTAL APPLICATIONS OF CARBON-BASED NANOMATERIALS. ACETYLCHOLINESTERASE BIOSENSORS FOR ORGANOPHOSPHATE PESTICIDE ANALYSIS

    I. ION, A. CULETUA, D. GHERASE, F. SIRBU, A. C. ION .......................................... 33 THE EFFECTS OF CALCINED AND DOPED SILICA NANOSTRUCTURES ON HALOTOLERANT MICROORGANISMS ISOLATED FROM ROCK SALT CRYSTAL

    M. ENACHE, S. NEAGU, C. ANASTASESCU, R. COJOC, M. ZAHARESCU ............... 51 PULSED LASER ABLATION SYNTHESIS OF CARBON NANO-STRUCTURES: EFFECT OF TARGET COMPOSITION AND LASER ABLATION CONDITION ON THEIR YIELD AND MORPHOLOGY

    I. BOERASU, M. ENACHESCU .......................................................................................... 61 STRATEGIES FOR THE STRUCTURE AND MORPHOLOGY CONTROL OF BaTiO3 NANOPARTICLES

    F. MAXIM, P. FERREIRA, P. VILARINHO ....................................................................... 83 NANOMATERIALS FOR RESTORATION AND CONSERVATION OF HISTORICAL MONUMENTS

    R.M. ION ............................................................................................................................. 99 NANOSCALE DIODES WITHOUT p-n JUNCTIONS

    M. DRAGOMAN .................................................................................................................. 113 PREPARATION OF POROUS CALCIUM ALGINATE BEADS AND THEIR USE FOR ADSORPTION OF O-NITROPHENOL FROM AQUEOUS SOLUTIONS

    S. PERETZ, M. FLOREA-SPIROIU, D.F. ANGHEL, D. BALA, C. STOIAN, Ghe. ZGHEREA .............................................................................................. 123

  • 6

    COMPARATIVE THERMODYNAMIC STUDY ON EXFOLIATED GRAPHITE NANOPLATELETS SYSTEMS DISPERSED IN DIMETHYLFORMAMIDE AND WATER AT T= (293.15, 298.15 and 303.15) K

    F. SIRBU, I. ION, A.C. ION ................................................................................................ 137 NANOSTRUCTURED TITANOSILICATE MICROSPHERES WITH GALLIUM AND LANTHANUM BASED NANOCRYSTALS

    O. PONTA, S. SIMON ......................................................................................................... 153

  • FOREWORD

    The new volume New applications of nanomaterials belongs to the Micro and nano engineering series, edited by the Publishing House of the Romanian Academy. This volume consists of the extended versions of the most relevant papers selected from the 12th edition of the Annual National Seminar for Nanoscience and Nanotechnology (Bucharest, May 13th, 2013).

    The manuscripts published in this volume address a large area of very interesting applications among which there can be emphasized the environmental ones: AuNPs/LDHS assemblies as nanoarchitectures for environmental photocatalysts; possible environmental applications of graphene-based nanomaterials; functionalized porous alginate beads for environmental decontamination. Some medical applications are also present, the effect of titanate nanotubes against moderately halophilic bacteria being one of them. Applications of nanomaterials in electronics include nanoscale diodes without p-n junctions and last but not at least, nanomaterials for restoration and conservation of historical monuments offer new solutions for obeying to the principle of preserving the authenticity of historical heritage.

    From this very short summary of the contributions it results a broad area of applications, but not enough for another group of researchers at the Seminar who presented new routes of synthesis and characterization of nanomaterials which can be the seeds for new applications in the near future. This first sub-set of manuscripts presents studies on carbon-based nanomaterials such as: boron-doped diamond nanowires (BDD NWs) for the sensitive detection of amino acids in binary mixtures and in proteins, conditions for carbon nano-onions deposition, using excimer laser to ablate a commercial pure graphite, further characterized by transmission electron microscopy (TEM) analyses and thermodynamic studies on exfoliated graphite nanoplatelets dispersed in water, and N,N-dimethylformamide, respectively, at different concentrations of solvate and at different temperatures.

    The second sub-set of manuscripts of this group containing synthetic routes and characterization refers to inorganic nanomaterials strategies for simultaneous control of tetragonality, size and shape in barium titanate, the effect of lanthanum and gallium

  • and of the thermal treatment on the surface composition and structure of titanosilicate systems and the major interest of these systems in different applications.

    The volume New applications of nanomaterials contains eleven papers (170 pages) and it might help the experienced researchers in this field to find new motivations to continue and the new comers to gain the enthusiasm to make the first steps in the magic nano world.

    The Editors

    March 2014

  • AuNPs/LDHS Assemblies as Nanoarchitectures: Fabrication, Properties and

    Specific Application as Photocatalysts

    Mihaela BIRSANU1, Dragos MARDARE1, Magda PUSCASU1, Kiyoshi OKADA2 and Gabriela CARJA2

    1Department of Chemical Engineering, Faculty of Chemical Engineering and

    Environemntal Protection, Tecnhical University Gh. Asachi of lasi, Bd. Mangeron no.71, Iasi 700554, Romania

    e-mail:carja@uaic.ro

    2Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, 226-8503, Japan

    Abstract. Nanostructured formulations based on nanoparticles of gold supported on zinc-cerium substituted anionic clays (denoted as Au/LDHs) and their derived solid solutions were reported for the investigation of photocatalytic performances in the process of Methylene Blue degradation from aqueous solutions with Vis light. The fabrication of Au/LDHs nano-photocatalysts is simple and cost effective based on the structural memory effect of the clay matrix in aqueous solution of AuCl3. XRD, N2 adsorption- desorption and UV-Vis analysis were used to investigate the structure, size morphologies characteristics and the photoresponsive properties of the samples. The results presented in our work open new perspectives for fabrication of nano-photoresponsive formulations for degradation of toxic organic pollutants from aqueous solutions.

    Keywords: gold substituted anionic clay, layered double hydroxides; Methylene blue; photodegradation

    1. Introduction

    In the last years have been increasing demands for catalysts that can eliminate the polluting materials from the environmental, because the environmental deterioration has become a major obstacle [1]. Photocatalytic degradations of the pollutants represent the most extensive solution for removal of organic dyes and toxic contaminants from wastewater. The degradations of dyes by photocatalytic phenomena, where a semiconductor is activated by light irradiation, can release

  • M. Birsanu, et al.

    10

    harmless products in wastewater [1, 2]. The photodegradation of the dyes from aqueous solution can be performed by oxidizing agents produced by photo Fenton based reactions under visible light using oxidants such as H2O2, ozone or transitional metals [2]. A wide range of semiconductors, that can take action as sensitizers for light reduced redox process, have been used in photocatalytic reactions type ZnO, SnO2, but the most applied was TiO2 due to high oxidative power, photostability and nontoxicity [3, 4]. The degradation of the dyes under differ