硅烷偶联剂KH-550表面改性纳米γ-Fe_2O_3

Surface Modification of Nano γ-Ferric Oxide with Silane Coupling Agent KH-550

为了改善纳米γ-Fe2O3粉体的表面活性,通过γ-氨丙基三乙氧基硅烷(KH-550)的水解和缩合反应对纳米γ-Fe2O3粉体进行表面改性。采用正交试验设计,以表面偶联包覆量为指标研究了偶联剂浓度、反应温度和反应时间对KH-550表面改性纳米γ-Fe2O3的影响。采用电子透射电镜(TEM)、红外线光谱分析仪(FTIR)和粒径分析仪表征。研究发现:最佳表面改性工艺条件为偶联剂质量分数为4.5%、反应温度为55℃和反应时间6 h;KH-550能与纳米γ-Fe2O3形成化学结合;表面改性后的纳米γ-Fe2O3能有效地阻止颗粒之间的相互团聚,纳米粉体的平均粒径减小43.9%,粒径分布更加集中,分散性能得到改善。

In order to increase the superficial capacity of nanny-ferric oxide, surface modification of nano γ-Fe2O3 powder was carried out by hydrolysis and condensation of γ-aminopropyltriethoxylsilane coupling agent（KH-550）. With surface coupling cladding concentration as the index,orthogonal experiment design was utilized to research effects of the coupling agent concentration, reaction temperature, and reaction time on the surface modification of γ-Fe2O3 by KH-550. The synthesized product was characterized by transmission electron microscope（TEM）, infrared spectrometer（FFIR） and particle size analyzer. The optimum conditions were obtained, as follows： coupling agent mass concentration 4.5%, reaction temperature 55 ℃ and reaction time 6 h. KH-550 could form chemical bond with nano γ-Fe2O3. The agglomeration of γ-Fe2O3 particles was effectively restricted after surface modification. The average particle size was reduced by 43.9% and particle size distribution was more uniform and dispersion nronertv was improved.