Preparation Of Silica - Based Microsphere Materials By Ordered Macroporous Carbon Template Method

Due to the unique spherical structure and large specific surface area, more and more researchers pay attention to spheres materials. The latest study showed that bioactive glass have excellent bioactivity and biocompatibility, also have cell and gene activation function, which plays a key role in the repair function for hard tissues. Iron oxide materials are widely used in many fields, especially in light catalysis because of its advantages such as stable, narrow band gap, and harmless to the environment, etc. Properties of materials depend on their structure. Properties of materials can be greatly enhanced by preparation of materials with special structure. Particle size controlled microsphere material can be prepared by using copy method with three-dimensional ordered macro porous carbon template.In this paper, bioactive glass microsphere (BGs) was prepared by using a sol-gel method combining an evaporation-induced self-assembly (EISA) process in a three-dimensional ordered macro porous carbon template. Composition of BGs was determined by EDS test for 58S-BGs. SEM, XRD and FT-IR were used respectively to characterize its morphology, crystal form and the composition. Its size and size distribution were characterized by DLS test. The results show that the obtained 58S-BGs was amorphous microspheres with a uniform particle size that about 300nm. The degradation experiment research on 58S-BGs was conducted in the human body fluid (SBF) to evaluate its bioactivity and biodegradability. The composition and structures of 58SC-BGs was investigated by FTIR, TEM, and XRD. The changes of ion concentration in SBF were detected by ICP. The results showed that,58S-BGs have good biological activity and biodegradability.Three-dimensional ordered macro porous carbon was used as a template to prepare Fe2O3/SiO2 composite microspheres. The morphology was characterized by TEM. XRD, VSM were used to analysis the crystal and magnetic properties of the microspheres. Particle size and size distribution were tested by DLS. The results show that, obtained Fe2O3/SiO2 composite microspheres have a uniform particle size (about 400nm) and hollow structure. It is composed mainly of crystalline α-Fe2O3 and amorphous SiO2, The saturation magnetization is 2.89emu/g, and the coercive force of about 21Oe. It exhibits paramagnetic.C/SiO2 composite was prepared by high-temperature heat treatment with the SiO2 colloidal crystal template immersed in an ethanol solution of phenolic resin. The morphology of materials was characterized by SEM. TG analysis was used to determine the component content of the material. The crystal was analyzed by XRD. And the conductive property of the material was explored. The results show that, the obtained composite material composed of crystalline SiO2 and amorphous carbon. The mass ratio of SiO2 and C was 18.84. SiO2 microsphere close-packed three-dimensional order is as the main Carbon filled in the gap between the SiO2 microspheres three-dimensional ordered densely packed as the principal part of the material, in order to form a continuous three-dimensional network. The average resistivity of the material p=5284.16Ω·m. The composite is electrically conductive.Microspheres material with well morphologies and uniform particle size can be prepared by using ordered macro porous carbon template. It provides a new preparation method and ideas for preparing functional spheres materials.