奈米磁性氧化鐵微粒表面改質及其應用之研究

Surface Modification of Ferromagnetic Iron Oxide Nanoparticles and Its Applications

林錕松(Kuen-Song Lin) ； 蔣孝澈(A.S.T. Chiang) ； 莊添豋(Tien-Deng Chuang) ； 劉承書(Chen-Shu Liu)

《界面科學會誌》 26卷3期 (2004/09) Pp. 139-149

https://doi.org/10.30020/JCCIS.200409.0003

摘要

奈米磁性氧化鐵（ferromagnetic iron oxides, Fe2O3）因本身為奈米結構及特殊電磁特性，具有吸收電磁波的優異特性，故深具發展應用的潛力及重要性。由於分散溶液的狀態與分散相的尺寸有很大的關係，若鐵磁性氧化物粒徑減小，則由於分子／粒子的熱運動布朗運動逐漸顯現，所以當分散相粒徑小於50 nm時，分散相可長久保持分散狀態。也就是奈米分散液可以保持較為長久的分散均勻狀態。因此，在應用上若系統的粒徑可以做到奈米級，則可降低有機溶劑的使用量，提升分散奈米磁性微粒的分散能力。故本研究乃選擇兩種商業化的磁性奈米氧化鐵粉（Fe2O3）進行表面改質及分散，使用之改質劑矽烷（silane）有含壓克立基之methacrylane（Z-6030 silane）、含環氧基之epoxy（Z-6040 silane）、含胺基之amino （Z-6011 silane）、含正辛烷的n-octyl（Z-6341 silane）、silicon oil（1107 fluid）及H-silicon oil（200(R)）共六種，並將表面改質後之奈米磁性氧化鐵分散到二甲基甲醯胺（DMF）、N,N-二甲基乙醯胺（DMAc）、丁酮或甲基乙基甲酮（MEK）及乙酸異丙酯（IPA）等共四種塗料工業常使用溶劑中。商業化奈米磁性氧化鐵粉經FE-SEM之表面分析結果顯示粒徑約為20-40 nm，表面積約為20-30 m2/g。實驗結果可知1107 fluid（silane）與壓克力基兩種改質劑，在四種分散劑中，分散效果及懸浮時間皆良好，而其他四種改質劑，在不同的分散劑中，分散效果皆相異。改質成功後的奈米磁性氧化鐵粉，能均勻分散在DMF或 DMAc中，且能維持在8小時以上不反應之分散狀態，突破分散技術上的瓶頸。

關鍵字

奈米磁性氧化鐵 ； 奈米材料 ； 表面改質 ； 分散 ； PU塗料

並列摘要

The ferromagnetic iron oxide (FIO, Fe2O3) nanoparticles possessing nanostructures and special ferromagnetic properties are the excellent wave-absorbing materials that having notable potentials for industrial applications. The addition of FIO nanoparticles into resin has been recognized to improve many of its physicochemical properties. However, the prerequisite is the complete dispersion of FIO nanoparticles in solvents or resin as unagglomerated individual particles, so that interfacial chemical or hydrogen bonding can be maximized. Surface modification is a common approach to alter and improve the dispersibility of FIO nanoparticles in solvent or resin. Therefore, the main objective of the present work was to investigate and test the surface modification by functionalized silanes or silicon oils and the dispersion in industrial solvents for the commercial FIO nanoparticles. The surface modifiers were 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, n-octyltriethoxy-silane, silicon oil (1107 fluid), and H-silicon oil (200(R)). The dispersers of industrial solvents were dimethylformamide(DMF), N,N-dimethyl acetamide (DMAc), methyl ethyl ketone (MEK), and isopropyl acetate (IPA). The FE-SEM microphotos and BET adsorption isotherms showed that the FIO nanoparticles were in the range of 20-40 nm in diameter and the surface area were in the range of 20-30 m2/g, respectively. Experimentally, the 1107 fluid (silane) and 3-methacryloxypropyltrimethoxysilane were the excellent dispersers to FIO nanoparticles dispersed in the solvents for over eight hours suspension.

並列關鍵字

ferromagnetic iron oxide nanoparticle ； nanomaterials ； surface modification ； dispersion ； PU coating