A fast approach was described for the synthesis of water-dispersible monodisperse dopamine-coated Fe_3O_4 nanoparticles(DA-Fe_3O_4) with uniform size and shape via ligand-exchange of oleic acid on Fe_3O_4 using only 2 min.The prepared DA-Fe_3O_4 nanoparticles were characterized by transmission electron microscopy,Fourier transform infrared spectrometry,and vibrating sample magnetometer.The results indicated that the resulting DA-Fe_3O_4 nanoparticles had an average diameter of about 19.2 nm. The magnetic saturation value of the prepared DA-Fe_3O_4 nanoparticles was determined to be 72.87 emu/g,which indicating a well-established superparamagnetic property.
Peng AnFang ZuoYuan Peng WuJun Hua ZhangZhao Hui ZhengXiao Bin DingYu Xing Peng
In this study, liquid crystal(LC) was used to study the interactions of alkyl polyglycosides(APG) with gelatin and bovine serum albumin(BSA) at the LC-aqueous interface. The LC easily undergo an orientational transition from a homeotropic to a planar state after proteins were in contact to the LCaqueous interface decorated with APG, thus inducing an optical change from dark to bright. The optical image analysis reveals that the rearrangement rate of APG monolayer is tightly dependent on the concentration and chemical structure of the protein of interest. For example, the rearrangement rate of APG monolayer increases with an increasing gelatin concentration. We also find that the chemical structure of the proteins has a significant impact on the difference in the growth behavior of bright domains in LC.
Zhi-Jian LiaoSi-Nan DuYang LuoFang ZuoJian-Bin Luo
