One-step synthesis of silica-coated magnetite nanoparticles by electrooxidation of iron in sodium silicate solution

  • Heru SetyawanEmail author
  • Fauziatul Fajaroh
  • W. Widiyastuti
  • Sugeng Winardi
  • I. Wuled Lenggoro
  • Nandang Mufti
Research Paper


Silica-coated magnetite nanoparticles have been synthesized successfully using a one-step electrochemical method. In this method, pure iron in a dilute aqueous sodium silicate solution that served as a silica precursor was electrooxidized. We show that the presence of silicate can significantly enhance the purity of the magnetite formed. Impurities in the form of FeOOH (found in the magnetite prepared in water) are not found. The magnetite nanoparticles produced by this method are nearly spherical with a mean size ranging from 6 to 10 nm, which is lower than the size of particles prepared in water, and this size range depends on the applied voltage and the sodium silicate concentration. The magnetite nanoparticles exhibit superparamagnetic properties with saturation magnetization ranging from 15 to 22 emu g−1, which is lower than the saturation magnetization of the Fe3O4 bulk materials (M s = 92 emu g−1). This facile method appears to be promising as a synthetic route for producing silica-coated magnetite nanoparticles.


Magnetite nanoparticles Electrochemical synthesis Sodium silicate Magnetic properties Aqueous system 



We would like to thank the Directorate General of Higher Education (DGHE), the Ministry of National Education, Indonesia, for funding through a Fundamental Research Grant and for the financial support for one of the authors (FF) to obtain a doctorate through BPPS and to visit the Tokyo University of Agriculture and Technology as a research fellow via a Sandwich-Like Program. We also thank Ms. Ratih Y. Utomo and Ms. Kartikasari Sutrisno for their assistance with the experiments.


  1. Berry CC, Curtis ASG (2003) Functionalization of magnetic nanoparticles for applications in biomedicine. J Phys D App Phys 36:R26–R198CrossRefGoogle Scholar
  2. Buschow KHJ (2006) Handbook of magnetic materials, 16th edn. Elsevier BV, AmsterdamGoogle Scholar
  3. Chang C, Wu Y, Hou S (2009) Preparation and characterization of superparamagnetic nanocomposites of aluminosilicate/silica/magnetite. Colloid Surf A 336:159–166CrossRefGoogle Scholar
  4. Cheng FY, Su CH, Yang YS, Yeh CS, Tsai CY, Wu CL, Wu MT, Shieh DB (2005) Characterization of aqueous dispersions of Fe3O4 nanoparticles and their biomedical applications. Biomaterials 26:729–738CrossRefGoogle Scholar
  5. Deng Y, Wang C, Hu J, Yang W, Fu S (2005) Investigation of formation of silica-coated magnetite nanoparticles via sol-gel approach. Colloid Surf A 262:87–93CrossRefGoogle Scholar
  6. Fajaroh F, Setyawan H, Widiyastuti W, Winardi S (2011) Synthesis of magnetite nanoparticles by surfactant-free electrochemical method in an aqueous system. Adv Powder Technol, (in press), doi: 10.1016/j.apt.2011.04.007
  7. Girginova P, Daniel-da-Silva A, Lopes C, Figueira P, Otero M, Amaral V, Pereira E, Trindade T (2010) Silica coated magnetite particles for magnetic removal of Hg2+ from water. J Colloid Interf Sci 345:234–240CrossRefGoogle Scholar
  8. Gupta A, Gupta M (2005) Synthesis and surface engineering of iron oxide nanoparticles for biomedical applications. Biomaterials 26:3995–4021CrossRefGoogle Scholar
  9. Hong RY, Li JH, Zhang SZ, Li HZ, Zheng Y, Ding JM, Wei DG (2009) Preparation and characterization of silica-coated Fe3O4 nanoparticles used as precursor of ferrofluids. Appl Surf Sci 255:3485–3492CrossRefGoogle Scholar
  10. Li YS, Church JS, Woodhead AL, Moussa F (2010) Preparation and characterization of silica coated iron oxide magnetic nano-particles. Spectrochim Acta A 76:484–489CrossRefGoogle Scholar
  11. Mayo JT, Yavuz C, Yean S, Cong L, Shipley H, Yu W, Falkner J, Kan A, Tomson M, Colvin VL (2007) The effect of nanocrystalline magnetite size on arsenic removal. Sci Technol Adv Mater 8:71–75CrossRefGoogle Scholar
  12. Nishio K, Ikeda M, Gokon N, Tsubouchi S, Narimatsu H, Mochizuki Y, Sakamoto S, Sandhu A, Abe M, Handa H (2007) Preparation of size-controlled (30–100 nm) magnetite nanoparticles for biomedical applications. J Magn Magn Mater 310:2408–2410CrossRefGoogle Scholar
  13. Ozkaya T, Toprak MS, Baykal A, Kavas H, Köseoğlu Y, Aktaş B (2009) Synthesis of Fe3O4 nanoparticles at 100 °C and its magnetic characterization. J Alloy Compd 472:18–23CrossRefGoogle Scholar
  14. Pang KM, Ng S, Chung WK, Wong PK (2007) Removal of pentachlorophenol by adsorption on magnetite-immobilized chitin. Water Air Soil Poll 183:355–365CrossRefGoogle Scholar
  15. Sen T, Bruce JI (2009) Mesoporous silica-magnetite nanocomposites: fabrication, characterisation and applications in biosciences. Micropor Mesopor Mat 120:246–251CrossRefGoogle Scholar
  16. Setyawan H, Balgis R (2011) Mesoporous silicas prepared from sodium silicate using gelatin templating. Asia-Pac J Chem Eng, (in press) doi: 10.1002/apj.593
  17. Socrates G (1994) Infrared characteristics group frequencies, 2nd edn. Wiley, New YorkGoogle Scholar
  18. Souza KC, Ardisson AJD, Sousa AEMB (2009) Study of mesoporous silica/magnetite systems in drug controlled release. J Mater Sci Mater M 20:507–512CrossRefGoogle Scholar
  19. Teja AS, Koh P (2009) Synthesis, properties, and application of magnetic iron oxide nanoparticles. Prog Cryst Growth Ch 55:22–45CrossRefGoogle Scholar
  20. Yang H, Zhuang Y, Hu H, Du X, Zhang C, Shi X, Wu H, Yang S (2010) Silica-coated manganese oxide nanoparticles as a platform for targeted magnetic resonance and fluorescence imaging of cancer cells. Adv Funct Mater 20:1733–1741CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Heru Setyawan
    • 1
    Email author
  • Fauziatul Fajaroh
    • 2
  • W. Widiyastuti
    • 1
  • Sugeng Winardi
    • 1
  • I. Wuled Lenggoro
    • 3
  • Nandang Mufti
    • 4
  1. 1.Department of Chemical Engineering, Faculty of Industrial TechnologySepuluh Nopember Institute of TechnologySurabayaIndonesia
  2. 2.Department of Chemistry, Faculty of Mathematics and ScienceMalang State UniversityMalangIndonesia
  3. 3.Institute of Symbiotic Science and TechnologyTokyo University of Agriculture and TechnologyTokyoJapan
  4. 4.Department of Physics, Faculty of Mathematics and ScienceMalang State UniversityMalangIndonesia

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