Xiaoming Sun
Beijing University of Chemical Technology, China
Title: Nanoseparation-from Methodology to Application
Biography
Biography: Xiaoming Sun
Abstract
Density gradient ultracentrifugarion (DGU) separation method was established to obtain monodispersed colloidal nanostructures. Such separation method was demonstrated as a versatile method for acquisition of monodispersed colloidal nanoparticles which are hard to be synthesized. This separation method was applicable to both aqueous (polar) and organic (non-polar) solvents systems; and NPs with different size, density and morphology can be separated. Separation objects involve nearly all kinds of materials including metal and metal oxides/sulfides, carbon materials, semiconductors, etc. Synthesis-structure-property relationships were observed on the separated NPs, which guided synthetic optimization. Besides separation, concentration and purification of NPs could be achieved at the same time when a water/oil interface was introduced into the separation system. By introducing a reaction zone or an assembly zone in the gradient, we can monitor the reaction and assembly of NPs since reaction time could be controlled and chemical environments could be changed extremely fast. In short, “Lab in a tube” method paved a way for the research on nanoparticle synthesis optimization, purification, assembly and surface reactions.