| 摘要 |
In the present invention, there is disclosed a process for preparing fibrous and lamellar microstructures and nanostructures through controlled vacuum freeze-drying of nanoparticle liquid dispersion, wherein said nanoparticle liquid dispersion, optionally a submicron particle liquid dispersion is very quickly frozen to a solid state. In this form, it is subjected to vacuum freeze-drying of disperse medium liquid molecules with a required speed of sublimation until their complete removal by sublimation under the formation of fibrous and/or lamellar microstructures and nanostructures. Angular orientation of normal of the sublimation interface predominant surface relative to a vertical, is selected, as the case may be, in the whole range from upward up to downward. The sublimation rate of the frozen material is adjusted by a combination of a vacuum depth and an external heating of the frozen material sublimation surface. |
