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In this research, mercapto-silica coated magnetite (Fe3O4-SiO2-SH) has been prepared in aqueous solution through a simple approach so called a one-pot process. The Fe3O4-SiO2-SH was prepared in nitrogen condition by mixing magnetite, 3-mercaptopropyltrimethoxysilane (MPTMS), and sodium silicate (Na2SiO3) solution extracted from rice hull ash, and adjusting the pH of 7.0 using hydrochloric acid. The residue was washed with deionized water, dried at 150°C and separated with an external magnetic field. In that work, the volume of MPTMS and Na2SiO3 was varied and the total amount of Si represented as silica was kept constant. Characters of the material including the functional group presence, the structure, the porosity, the morphology and stability toward various solvents were identified and evaluated. Results of characterization indicated that mercapto-silica has been coated magnetite particle with a simple one-pot process. Coating mercapto-silica on magnetite increases particle size, surface area, and chemical stability. Additionally, Fe3O4-SiO2-SH also shows high stability toward various organic solvents. The magnetic property of magnetite does not change after coating and the addition of nonmagnetic material still gives high value of maximum saturation magnetization. The presence of mercapto groups effective for interaction with heavy metal ions, the high chemical stability without removing the magnetic property promises the prospective application of Fe3O4-SiO2-SH in the future such as for separation and removal of heavy metal ions from aquatic environments.

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ABSTRAKE glass  ber dental adalah  ber yang sering digunakan di kedokteran gigi. Ketersediaan E glass  ber di Indonesia masih sangat terbatas. Berbagai jenis bahan glass  ber non dental banyak ditemukan dipasaran sebagai material engeenering dengan harga yang relatif murah sehingga diharapkan dapat digunakan sebagai alternatif pengganti E glass  ber dental. Komposisi glass  ber non dental hampir sama dengan E glass  ber dental. Komposisi berpengaruh terhadap sifat mekanis dan sifat-sifat kimia  ber. Komposisi glass  ber seperti Na 2 O dan K 2 O akan meningkatkan ketahanan terhadapap air. Tujuan dari penelitian ini adalah mengetahui pengaruh komposisi glass  ber non dental terhadap kelarutan komponen. Bahan yang digunakan dalam penelitian ini adalah E glass  ber dental (Fiber-splint, Polydentia SA, Switzerland), glass  ber non dental komposisi A (LT, China), komposisi B (CMAX, China), komposisi C (HJ, China),  owable komposit (CharmFill Flow, Denkist, Korea) dan silane coupling agent (Monobond S, Ivoclar Vivadent, Liechtenstein). Subjek dibagi dalam 4 kelompok untuk dilakukan uji kelarutan berdasarkan ISO 4049. Hasil yang diperoleh dianalisis menggunakan ANAVA satu jalur (α = 0,05). Hasil penelitian menunjukkan rerata kelarutan komponen (%) yang terendah pada kelompok E-glass  ber dental (0,476±0,03) dan hasil tertinggi pada glass  ber non dental C (0,600±0,01). Hasil uji Anava satu jalur menunjukkan perbedaan yang bermakna antara komposisi  ber pada kelarutan komponen (p<0,05). Kesimpulan penelitian adalah komposisi Na 2 O dan K 2 O serta CaO dan MgO yang rendah dapat menurunkan sifat kelarutan komponen dari  ber reinforced composites.Kata kunci: glass  ber non dental, kelarutan komponen, komposisi  ber ABSTRACT: The effect of composition glass  ber non dental on water solubility of  ber reinforced composites. E glass  ber dental is one of the most used dental  bers in several applications in the dental  eld. However, the available of E glass  ber dental in Indonesia is very limited. A variety of types of non-dental glass  ber material is easily found as the materials engineering. The purpose of the study was to evaluate the effect of composition non dental glass  ber on the component solubility of FRC. The materials used in the research was E glass  ber dental (Fiber splint, Polydentia SA, Switzerland), composition A non-dental glass  ber (LT, China), composition B (CMAX, China), composition C (HJ, China),  owable composite (Charm ll Flow, Denkist, Korea) and silane coupling agent (Monobond S, Ivoclair Vivadent, Liechtenstein). The subject was divided into 4 groups. Component solubility test was based on the ISO 4049. The result was then analyzed with one way ANOVA (α=0,05). The result of the research showed that on the average percentage of the solubility (%), the lowest was on the group of E glass  ber dental (0.476±0.03) and the highest was on the non dental glass  ber C (0.600±0.01). The result of the one way ANOVA test showed a signi cant difference between the composi...