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ITS » Undergraduate Theses » Teknik Kimia
Posted by reini@its.ac.id at 15/11/2011 14:47:18  •  1932 Views


SINTESIS NANOPARTIKEL MAGNETITE DENGAN METODE ELEKTROKIMIA MENGGUNAKAN PULSED DIRECT CURRENT PDC

SYNTHESIS OF MAGNETITE NANOPARTICLES BY ELECTROCHEMICAL METHOD USING PULSED DIRECT CURRENT PDC

Author :
KARINA AMALIA RACHMAN ( 2307100043 )
MEMIK DIAN PUSFITASARI




ABSTRAK

Tujuan penelitian ini adalah mensintesis nanopartikel magnetite yang tidak teraglomerasi dan monodisperse dengan metode elektrokimia menggunakan pulsed direct current PDC dan mengetahui karakteristik produk nanopartikel magnetite yang dihasilkan. Elektroplating besi dalam larutan elektrolit FeSO4 0.051 molL dengan rapat arus 0167 Adm2 selama 20 jam. Sintesis nanopartikel magnetite dilakukan dalam air demin menggunakan plat besi yang dilapisi dengan elektroplating sebagai anoda dan plat besi tanpa elektroplating sebagai katoda. Jarak antar elektroda 2 cm. Sintesis Fe3O4 dilakukan pada frekuensi 5 8 dan 10 Hz duty cycle 50 sampai 80 voltase 5 8 dan 10 volt dan pH larutan elektrolit yang bervariasi dari 7 sampai 10 dengan menambahkan larutan NaOH. Sintesis dilakukan selama 20 jam. Partikel yang dihasilkan disaring dan dikeringkan untuk selanjutnya dikarakterisasi. Karakteristik partikel magnetite untuk struktur kristal dengan uji XRD ukuran partikel magnetite dengan metode BET gugus fungsional magnetite dengan uji FTIR sifat kemagnetan dan saturation magnetization magnetite dengan uji VSM stabilisasi kimia dengan pengukuran absorbansi dan stabilisasi thermal dengan metode uji TG-DTA. Telah ditunjukkan partikel yang dihasilkan memiliki kemurnian yang tinggi asumsi berbentuk sphere ukuran partikel 4-30 nm yang tergantung pada amplitudo frekuensi duty cycle dan pH. Magnetite yang dihasilkan bersifat ferromagnetik dengan saturation magnetization yang relatif tinggi 60 emug. Nanopartikel magnetite stabil terhadap suhu sampai 200oC dan akan berubah menjadi maghemite jika pemanasan melebihi suhu 200oC.


ABSTRACT

The purpose of this work is to synthesis of non-agglomerated and monodispered magnetite nanoparticles by an electrochemical method using a pulsed direct current PDC and know the characteristic of the product produced. The iron to be electrooxidized to produce magnetite nanoparticles was electroplated in a 0.051 molL FeSO4 solution at a current density of 0.167 Adm2 for 20 hours. The synthesis was carried out in demineralized water using the electroplated plate as anode and iron plate as chatode. The distance between electrodes was set at 2 cm. The frequency of the pulsed-wave was varied from 5 8 10 Hz the duty cycle from 50 to 80 and the voltage from 5 8 10 volt. The pH of the electrolyte was varied from 7 to 10 by adding NaOH solution. The synthesis was carried out for 20 hours. The particles produced were filtered and dried. The dried particles were characterized for their crystal structure by XRD the size by BET method their functional groups by FTIR test their magnetic properties by VSM and their stability against heating by TG-DTA test and stability against acid by measuring absorbance. It has been shown that the produced particles have high purity a nearly spherical in shape with size of particles from 4 to 30 nm depending on amplitude frequency duty cycle and pH. They have ferromagnetic properties with relatively high saturation magnetization 60 emug. The magnetite is stable under heating up to 200oC above their it converts into maghemite.



Keywordselectrochemistry; magnetite nanoparticles; pulsed DC; duty cycle; frequency
 
Subject:  Elektrokimia
Contributor
  1. Prof. Dr. Ir. Heru Setyawan, M.Eng
  2. Ir. Minta Yuwana, MS
Date Create: 25/07/2011
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-Undergraduate-3100011043548
Collection ID: 3100011043548
Call Number: RSK 620.5 Kar s


Source
Undergraduate Thesis, Chemical Engineering, RSK 620.5 Kar s, 2011

Coverage
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Rights
Copyright @2011 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Undergraduate-15995-abstract_id.pdf - 180 KB
  2.  ITS-Undergraduate-15995-abstract_en.pdf - 177 KB
  3.  ITS-Undergraduate-15995-conclusion.pdf - 176 KB
  4.  ITS-Undergraduate-15995-paper.pdf - 368 KB




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