Sains Malaysiana 39(4)(2010): 593–598

Properties of Magnetic Paper Prepared via in situ Synthesis Method

(Sifat Kertas Bermagnet Disediakan Melalui Teknik Sintesis in situ)

Rose Farahiyan Munawar*, Sarani Zakaria, Shahidan Radiman

Chia Chin Hua & Mustaffa Abdullah

School of Applied Physics, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600, UKM Bangi, Selangor, Malaysia

T. Yamauchi

Graduate School of Agriculture, Kyoto University, 6068502 Kyoto, Japan

Received: 13 August 2009 / Accepted: 29 December 2009

ABSTRACT

Magnetic paper were prepared via the in situ synthesis method with ferrites in the presence of polyethylenimine (PEI). In this work, the thermomechanical pulp (TMP) fibers were used due to low percentage of collapse lumen and the large lumen size for optimum loading degree. Four cycles of the reaction were performed on the TMP fibers with pH values of 4-10. It was found that variation of pH value played an important role in the loading degree of pulp during synthesis process. The magnetic, morphological and structural properties of the magnetic paper obtained were reported. At the optimum pH of 6.0, saturation magnetization was found to be 3.08 emu/g, remainance magnetization was 0.11 emu/g and coercive force was 12.64 Oe. The optimum loading degree was found to be 23.25%.

Keywords: Fibers; magnetic filler; paper; thermomechanical pulp

ABSTRAK

Kertas bermagnet telah disediakan melalui kaedah sintesis in situ ferit dengan kehadiran polietilenemina (PEI). Dalam kajian ini, gentian pulpa termomekanikal (TMP) digunakan kerana peratus kerebahan lumen gentiannya adalah rendah dan ia mempunyai saiz lumen yang besar bagi darjah pemasukan yang optimum. Empat kitaran tindak balas telah dijalankan ke atas gentian TMP menggunakan nilai-nilai pH 4-10. Didapati variasi nilai pH larutan memainkan peranan penting pada darjah pemasukan pulpa semasa sintesis. Sifat magnet, morfologi dan struktur kertas bermagnet yang diperolehi dilaporkan. Pada pH optimum 6.0, pemagnetan tepu ialah 3.08 emu/g, pemagnetan baki ialah 0.11 emu/g dan daya paksa ialah 12.64 Oe. Darjah pemasukan yang optimum didapati sebanyak 23.25%.

Kata kunci: Kertas; pengisi magnetik; gentian pulpa termomekanikal

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*Corresponding author; email: rosefarahiyan@yahoo.com