Morphology Control And Properties Of Organic Nano And Micro Structures Based On Benzoylated Bacterial Cellulose

Different micro or nano structures were prepared for benzoylated bacterial cellulose (BBC), which was a kind of thermotropic liquid crystalline. The optimum processed conditions were obtained, and the relationship between the morphologies and the properties were studied. The main contents are as follows:1. BBC nanostructures with different morphologies (including nanoplatelets, nanotubes, and nanoparticles) were prepared by reprecipitation method. The optimum process conditions were as follows: the nanoplatelets were formed, when BBC was 0.5×10-3g/mL in THF solution, the standing time is 6h, the temperature at 16℃; the nanotubes were formed, when BBC was 0.75×10-3g/mL in THF solution, the standing time is 6h, the temperature at 16℃; the nanoparticles were formed, when BBC was 2×10-3g/mL in THF solution, the standing time is 6h, the temperature at 16℃. The fluorescence intensity of the nanostructures for BBC enhanced up to 30-60 times compared with initial of BBC in THF dilute solution. The order of the intensity increase is nanotubes > nanoparticles > nanoplatelets.2. BBC microstructures were prepared by microemulsion method with different morphologies (including microparticles, microwires, and the blending of microparticles and microwires). The optimum process conditions were: when the concentration of BBC was 1×10-3g/mL in THF solution, the standing time is 6h, the temperature at 16℃, the concentration of surface active agents solution is 1×10-3g/mL, the morphologies of BBC were different for the types of agents: 1631 for microparticles; SDS for microwires; Betaine for the blending of microparticles and microwires. The fluorescence intensity was changed with different mopholorgies. The order of the increasing intensity is microwires>the blending of microparticles and microwires> microparticles.The processes are very simple and controlled for preparing different morphologies of BBC. It will play a great role to research the organic micro-nanostructures materials used in high temperature.