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L Kozhitov. A. Kostikova. V. Kozlov. Zh. Myrkhalykov. A. Saipow FEATURES OFFeNi3 NANOPARTICLES IN POL YACRYL0N1TRILE FORMA TION UNDERINFRARED HEATING

THEORETICAL FUNDAMENTALS OF INDUSTRIAL TECHNOLOGY

FEATURES OF FeNi₃ NANOPARTICLES IN POŁYACRYLONITRILE FORMATION

UNDER INFRARED HEATING

L. Kozhitov^r, A. Kostikova', V. Kozlov², Zh. Myrkhalykov\ A. Saipov³

¹National Unirersity of Science and Technology> "MISIS", Moscow, Russia ²A. V. Topchiev Institute of Petrochemical Synthesis of RAS, Moscow, Russia ~M. Auezov South-Kazakhstan State University, Shymkent, Kazakhstan

Abstract

FeNi₃ nanoparticles were obtained from FeCl₃-6H20/NiCl₂-6H₂C)/polyacrylonitrile (PAN) composite under infrared (IR) heating. Fe and Ni rcduction from metal chlorides by H₂ emitted at temperaturę higher than 300°C under the polymer destruction was confirmed by the thermodynamic calculation. FeNi₃ nanoparticles in the rangę from 20 to 60 nm were identified by X-ray phase analysis (XPA) and using scanning electron microscopy (SEM).

Keywords: Nanoparticle; infrared heating; dispersion; nanocomposite; conjugated bond; polyacrylonitrile.

INTRODUCTION

For developing electronics, FeNi^C nanocomposites that represent FeNi₃ nanoparticle dispersion into the carbon materiał are perspective [1-5]. FeNi₃/C nanocomposites unitę the advantageous properties of FeNi₃ (magnetic permeability equals to 50000^3000000; coercivity in the interval from 0.65 to 5.0 A/m; magnetostriction of 0.003 %; magnetoresistance about 4 % [5]) and these of carbon materiał (density of 2 g/cm³; thermal conductivity to 1700 W/(m-K); thermal stability in the air to 300°C; the possibility to obtain different allotropic forms (nanotubes, graphenes, hillerenes); biocompatibility) [4,6]. FeNi₃/C nanocomposites can be used to produce various devices: the memory with a recording density and an information storage of 10 bit/cm [7]; random access memory with a density of 64 bit/p² [8], a magnetoresistant sensor [3]. Due to high specific surface nanoparticles have a high Chemical activity and an ability to aggregate that suggest the economically efTective synthesis of FeNi₃ alloy nanoparticles at the temperaturę lower than that for rolling, fusion under vacuum and inert gases by cooling the melt arising at the temperaturę above I300°C [9].

The research goal is to develop the method of composite obtaining based on FeNi₃ alloy nanoparticles dispersion into the carbon materiał    from    the

FeCl₃*6H₂0/NiCl2-6H₂0/PAN system under infrared heating.

METHODOLOGY OF EXPER1MENT

The initial composite was obtained by FeCl₃ • 6H₂0, NiCl₂ • 6H₂0 salts and PAN in dimethylformamide (DMF) joint dissolution at 60°C. Concentrations of Cp_c and Cn₍ in the initial solution of FeCl₃-6H20/NiCl₂-6H₂0/ PAN /DMF were varied from 5 to 20 mass %. To obtain FeNi₃/C nanocomposite powder, the initial mixture FeCl₃-6H20/NiCl2-6H₂0/PAN after drying was placed in an infrared-heating reactor [10]. The infrared heating was fulfilled at 500 and 700°C and P=10'² mm Hg for 15 minutes at the heating ratę of 10°C/min.

The phase composition was studied by the XPA on a DRON-2 diffractometer with modified collimation on the filtered CuK_a radiation. The identification of peak intensity in diffraction pattems is accomplished by the program PD Win 4.0.

From XPA data the calculation of average size for alloy particles obtained under the IR-heating is carried out by the Debye-Scherrer eąuation:

L = kA/B cos 6

u

Journal of Industrial Technology and Engineering, 2012, 2(3): 5-10

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