Fe3O4 particles with good dispersibility were synthesized by a solvothermal method.The surface of the Fe3O4 particles was first modified with oleic acid and cetyltrimethylammonium chloride(CTAC)was then coated via hydrophobic interactions to obtain Fe3O4@CTAC particles.The Fe3O4@CTAC particles were characterized by scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),Zeta potential measurements and vibrating sample magnetometry(VSM).The results show that the particle size of Fe3O4 has no obvious change after coating with CTAC,and the Fe3O4@CTAC particles retain good monodispersity.The Fe3O4@CTAC particles have superparamagnetism and good magnetic response properties.The Zeta potential of Fe3O4@CTAC particles is high,and the dispersion has good stability.The antibacterial properties and magnetic separation of Fe3O4@CTAC particles were tested.The results showed that when 50 mg/mL Fe3O4@CTAC particles were treated with E.coli(105 cfu/mL)for10min,the antibacterial rate could reach100％.Fe3O4@CTAC parti-cles also have good antibacterial effects on S.aureus and B.subtilis.The Fe3O4@CTAC particles and adsorbed bacteria can be separated using a magnetic field.The above results indicate that Fe3O4@CTAC is a fast,efficient antibacterial agent that can generate aseptic residues and thus has potential application value.
关键词
磁性Fe3O4粒子/十六烷基三甲基氯化铵(CTAC)/Fe3O4@CTAC/大肠杆菌/抗菌性能
Key words
magnetic Fe3O4 particles/cetyltrimethylammonium chloride(CTAC)/Fe3O4@CTAC/E.coli/anti-bacterial property
万方数据