Morphology Control and Properties of Organic Nano and Micro Structures Based on Benzoylated Bacterial Cellulose
|School||Southwest University of Science and Technology|
|Keywords||Bacterial cellulose Thermotropic liquid crystal Nanomaterials Fluorescence|
In this paper, the thermotropic liquid crystalline bacterial cellulose benzoate ( hereinafter referred to as BBC ) as raw materials prepared with different morphologies ( micro and nano ) materials of construction , preparation conditions and characterized by its morphology and optical properties of the relationship . The main contents are as follows : 1. Reprecipitation prepared bacterial cellulose benzoate nanosheets , nanotubes and nanoparticles . Optimum conditions of formation of nanocrystals of different morphologies : nanosheets : BBC / tetrahydrofuran ( THF ) concentration of 0.5 × 10-3g/mL , allowed to stand for a temperature of 16 ° C for 6 hours standing time ; nanotubes : BBC / THF concentration of 0.75 × 10-3g/mL allowed to stand for a temperature of 16 ° C for 6 hours standing time ; nano particles : BBC / THF concentration for 10-3g/mL , allowed to stand for a temperature of 16 ° C , standing time of 6h. Prepared with different morphologies nano-structured materials , the fluorescence properties of than BBC fluorescence raw materials increased by 30-60 times . And the order of their relative fluorescence intensity increases is the type of nanotubes gt ; nano - particles gt ; nano - sheet . 2 microemulsion method were prepared bacterial cellulose benzoate micron line , a mixture of micron particles and micro - particles and line . Morphology impact of different types of surfactants on the BBC . Its preparation process conditions : the the BBC / THF solution of a concentration of 1 × 10-3g/mL the Add of 1 × 10-3g/mL SDS standing time 6h, temperature 16 ° C , the formation of a micron line ; Add 1 × 10 the -3g/mL 1631 , the standing time 6h, temperature 16 ° C, the formation of micron particles ; adding 1 × 10-3g/mL betaine , standing time 6h, temperature 16 ° C , the formation of micron particles and micron line . These different morphologies BBC structure lead to different fluorescence properties . Their luminous intensity of the order of a micron line gt ; the micron particle microns line gt ; micron particles . Two preparation process used in this study is relatively simple , controllable , and laid a foundation for application of high temperature organic micro- nano-structured materials .