Method for preparing ferrite/silicon dioxide core-shell nano particles by using ultrasonic treatment

Abstract

The present invention relates to a method for using ultrasonic treatment to prepare ferrite-silicone dioxide core-shell nano particle. The method includes the following steps: firstly, using coprecipitation process to prepare ferrte nano particle, then making the ferrite nano particle under the process of ultrasonic treatment, then using inorganic silicone source and organic silicone source to make wrappage to twice so as to obtain the invented ferrite-silicone dioxide core-shell nano particle whose grain size is 50-200 nm. The product can be used in the fields of biological, sealing and magnetic recording material, etc.

Description

technical field

[0001] The invention belongs to the field of magnetic nanometer materials, in particular to a method for preparing core-shell magnetic nanometer particles. Background technique

[0002] Ferrite nanoparticles have been widely used in sealing, lubrication, printing and magnetic recording. Recently, ferrite nanoparticles have also received increasing attention in some bio-related fields, such as magnetic resonance imaging, bioseparation, drug delivery and therapy. However, due to the strong magnetic dipole interaction between ferrite nanoparticles, it is easy to form large aggregates, and the particles will dissolve under acidic conditions, which greatly limits their use. For this reason, ferrite nanoparticles are generally coated before use, and the coating layer is used to realize the dispersion of the particles and to protect the particles to a certain extent. The commonly used coating layer is an organic modification layer composed of some surface-active o...