Different preparation methods and characterization of magnetic maghemite coated with chitosan

Podrepšek, Gordana Hojnik; Knez, Željko; Leitgeb, Maja

doi:10.1007/s11051-013-1751-x

Cited by 12 publications

(10 citation statements)

References 15 publications

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“…As can be observed, all the three samples show bands located at the same wavenumber but with different intensities which increase continuously from sample MS1 to MS3, in accordance with increasing the silica content. It is mentionable that the characteristic bands of the Fe-O vibrations in the region 500-630 cm À 1 are not observable because they overlap with the intense band located at 469 cm À 1 , assigned to the Si-O-Si bending vibration [34,35].…”

Section: Ft-ir Spectramentioning

confidence: 99%

Synthesis and characterization of γ-Fe2O3/SiO2 composites as possible candidates for magnetic paper manufacture

Păcurariu

Tăculescu

Ianoş

et al. 2015

Ceramics International

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Section: Ft-ir Spectramentioning

confidence: 99%

Synthesis and characterization of γ-Fe2O3/SiO2 composites as possible candidates for magnetic paper manufacture

Păcurariu

Tăculescu

Ianoş

et al. 2015

Ceramics International

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“…Some of them include electrochemical method [11], laser pyrolysis [12], microemulsion synthesis [13], and hydrothermal technique [14]. In this work, we report the preparation of γ-Fe 2 O 3 nanocrystallites by co-precipitation chemical procedure.…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Monophasic Maghemite (γ-Fe2O3) Nanocrystalline Powder

Ramos-Guivar¹,

Martı́nez²,

Anaya³

et al. 2014

ANP

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Structural and magnetic studies of monophasic maghemite (γ-Fe2O3) magnetic nanocrystallites (MNCs) synthesized by the co-precipitation chemical route are reported in this paper. For the synthesis, a starting precursor of magnetite (Fe3O4) in basic medium was oxidized at room temperature by adjusting the pH = 3.5 at 80˚C in an acidic medium without surfactants. X-ray diffraction (XRD) pattern shows widened peaks indicating nanometric size and Rietveld Refinement confirms only one single-phase assigned to γ-Fe2O3 MNCs. High Resolution Transmission Electron Microscopy (HR-TEM) demonstrates the formation of nanoparticles with diameter around D ≈ 6.8 ± 0.1 nm which is in good agreement with Rietveld Refinement (6.4 ± 1 nm). A selected area electron diffraction pattern was carried out to complement the study of the crystalline structure of the γ-Fe2O3 MNCs. M(H) measurements taken at different temperatures show almost zero coercivity and remanence indicating superparamagnetic domain and high magnetic saturation.

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“…Namun demikian dalam proses ini akan terbentuk panas tinggi yang dapat mempengaruhi karakteristik bahan yang diproses. Untuk nanopartikel magnetik terlapis kitosan, kondisi pelapisan optimal biasanya dicapai setelah proses ultrasonikasi efektif 30 menit (Podreps dan Leitgeb 2013). Proses ini tidak dapat dilakukan dalam satu tahap waktu tanpa pengendalian suhu mengingat kitosan dapat mengalami proses dekomposisi pada suhu ~79°C.…”

Section: Pendahuluanunclassified

Pengendalian Suhu Ultrasonikasi Pada Pelapisan Nanopartikel Magnet (Fe3O4) Dengan Kitosan

et al. 2017

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ABSTRAK PENGENDALIAN SUHU ULTRASONIKASI PADA PELAPISAN NANOPARTIKEL MAGNET (Fe3O4) DENGAN KITOSAN.Telah dilakukan pelapisan nanopartikel magnetik Fe3O4 dengan proses ultrasonikasi terkendali. Pengendalian ultrasonikasi dilakukan dengan menambahkan fasilitas pendingin baik menggunakan air maupun es serta dengan pengaturan suhu pembatas pada fasilitas ultrasonikasi untuk memastikan suhu sampel maksimal 50 o C selama proses pelapisan kitosan. Nanopartikel hasil pelapisan dianalisis sifat magnetik dan distribusi ukuran partikelnya masing-masing menggunakan VSM (Vibrating Sample Magnetometer) serta PSA (Particle Size Analyzer). Hasil sintesis menunjukkan bahwa penambahan sistem pendingin cukup efektif dalam mengendalikan suhu dan menurunkan waktu total proses pelapisan serta ukuran nanopartikel terlapis kitosan. Namun pola perubahan ukuran yang terjadi tidak mengikuti sepenuhnya kaidah standar karena adanya proses re-aglomerasi nanopartikel magnetik akibat interaksi magnetik antar nanopartikel yang cukup kuat. Diperoleh hasil pelapisan optimum dengan ukuran nanopartikel magnetik terlapis kitosan sebesar ~ 36,5 nm dan nilai magnetisasi 45 emu/gram pada proses dengan sistem pendingin air. Kondisi ini dicapai dengan waktu total proses pelapisan 60 menit untuk waktu efektif proses ultrasonikasi 10 menit.

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Different preparation methods and characterization of magnetic maghemite coated with chitosan

Cited by 12 publications

References 15 publications

Synthesis and characterization of γ-Fe2O3/SiO2 composites as possible candidates for magnetic paper manufacture

Synthesis and characterization of γ-Fe2O3/SiO2 composites as possible candidates for magnetic paper manufacture

Structural and Magnetic Properties of Monophasic Maghemite (<i>γ</i>-Fe<sub>2</sub>O<sub>3</sub>) Nanocrystalline Powder

Pengendalian Suhu Ultrasonikasi Pada Pelapisan Nanopartikel Magnet (Fe3O4) Dengan Kitosan

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Different preparation methods and characterization of magnetic maghemite coated with chitosan

Cited by 12 publications

References 15 publications

Synthesis and characterization of γ-Fe2O3/SiO2 composites as possible candidates for magnetic paper manufacture

Synthesis and characterization of γ-Fe2O3/SiO2 composites as possible candidates for magnetic paper manufacture

Structural and Magnetic Properties of Monophasic Maghemite (&lt;i&gt;γ&lt;/i&gt;-Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;) Nanocrystalline Powder

Pengendalian Suhu Ultrasonikasi Pada Pelapisan Nanopartikel Magnet (Fe3O4) Dengan Kitosan

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Structural and Magnetic Properties of Monophasic Maghemite (<i>γ</i>-Fe<sub>2</sub>O<sub>3</sub>) Nanocrystalline Powder