磁性胶体晶体的制备与呈色特性

通过化学合成的方法制备出被表面活性剂聚丙烯酸(PAA)修饰的Fe3O4纳米粒子,并应用透射电子显微镜、X射线衍射、磁强计及傅里叶红外光谱仪对产物进行表征,同时利用FDTD solutions光学软件对产物的呈现性能进行建模仿真。最后通过分析得到制备的胶体产物具有超顺磁性能,粒径均一,在水中具有良好的分散性,粒子分散在水中形成的胶体在外在磁场的作用下能够自组装成液态光子晶体,不同磁场大小的调节下能够呈现不同的结构色,磁场越小,颜色越向着波长大的方向偏移,同时,用软件对胶体粒子仿真得到的呈色特性与实验结果一致。这种光子晶体在结构色印刷、传感器、防伪等各个领域有广泛的应用

Preparation and coloring of magnetic colloidal crystals

Fe3O4nanoparticles modified by surfactant polyacrylic acid (PAA) were synthesized through chemical method.The products were characterized by transmission electron microscopy(TEM),X-ray diffraction,vibrating sample magnetometers(VSM) and Fourier transform infrared spectroscopy(FTIR Spectrometer),respectively.The modeling and simulation of the chromatic performance of products are realized by optical software FDTD solutions. Product was prepared with superparamagnetism,uniform particle size,good dispersion and high water solubility in aqueous solution. These particles dispersed in water can form colloidal solution which can self-assemble into liquid photonic crystal under magnetic field.The different types of structural color will be showed under the regulations of different intensities of magnetic field. The peak of wave will shift towards the direction of the larger wavelength with decreasing magnetic field. In the meantime,there are the same results in the chromatic performance of products between simulation and experimental method. This kind of photonic crystal has many applications in all kinds of fields,such as structural color printing,sensor and anti-counterfeiting.