Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Morphology Control and Properties of Organic Nano and Micro Structures Based on Benzoylated Bacterial Cellulose

Author ZhouMingRu
Tutor PeiZhongHua
School Southwest University of Science and Technology
Course Analytical Chemistry
Keywords Bacterial cellulose Thermotropic liquid crystal Nanomaterials Fluorescence
CLC TB383.1
Type Master's thesis
Year 2010
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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 .

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