Klokkenburg M, Erné B H, Wiedenmann A, Petukhov A V, Philipse A P
Van 't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, Utrecht, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2007 May;75(5 Pt 1):051408. doi: 10.1103/PhysRevE.75.051408. Epub 2007 May 24.
Field-induced structure formation in a ferrofluid with well-defined magnetite nanoparticles with a permanent magnetic dipole moment was studied with small-angle neutron scattering (SANS) as a function of the magnetic interactions. The interactions were tuned by adjusting the size of the well-defined, single-magnetic-domain magnetite (Fe3O4) particles and by applying an external magnetic field. For decreasing particle dipole moments, the data show a progressive distortion of the hexagonal symmetry, resulting from the formation of magnetic sheets. The SANS data show qualitative agreement with recent cryogenic transmission electron microscopy results obtained in 2D [Klokkenburg, Phys. Rev. Lett. 97, 185702 (2006)] on the same ferrofluids.
利用小角中子散射（SANS）研究了具有明确永久磁偶极矩的磁铁矿纳米颗粒的铁磁流体中磁场诱导的结构形成，该研究是作为磁相互作用的函数进行的。通过调整明确的单磁畴磁铁矿（Fe3O4）颗粒的尺寸并施加外部磁场来调节相互作用。对于减小的粒子偶极矩，数据显示六方对称性逐渐畸变，这是由磁片的形成导致的。SANS数据与最近在二维[Klokkenburg，《物理评论快报》97，185702（2006）]中获得的关于相同铁磁流体的低温透射电子显微镜结果在定性上一致。
