کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7781648 | 1500562 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lyotropic liquid crystal self-assembly of H2O2-hydrolyzed chitin nanocrystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
H2O2 hydrolysis of mechanically-defibrillated chitin nanofibrils was explored as a green way of fabricating rod-like chitin nanocrystals (H2O2-hydrolyzed CHNs) that have an average length of 350â¯nm and width of 40â¯nm. We investigated the structure and morphology of CHNs as well as the rheology and lyotropic self-assembly behavior of its colloidal dispersions. The results show that although H2O2-hydrolyzed CHNs maintained the crystalline structure of α-chitin, surface charge of the nanorods was switched from positive to negative. As a consequence, the colloidal nanocrystals were well-dispersed in neutral or alkaline aqueous media, and behaved as a lyotropic liquid crystal between two critical concentrations. It is interesting that lyotropic liquid crystal transition was a spontaneously self-assembly from well-aligned nanofibers, to nanobelts, and to multi-layered lamellae. At high critical concentration, H2O2-hydrolyzed CHN colloids exhibited a sol-gel transition, which was discovered to be highly dependent on the storage time, concentration, temperature, and surface charge density. It is also suggested that nematic mesophases rather than gel could be effectively maintained by improving the surface charge density or lowering the aging temperature and colloidal concentration of CHNs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbohydrate Polymers - Volume 196, 15 September 2018, Pages 66-72
Journal: Carbohydrate Polymers - Volume 196, 15 September 2018, Pages 66-72
نویسندگان
Dagang Liu, Yu Chang, Donglin Tian, Wenqi Wu, Ang Lu, Nana Prempeh, Meijuan Tan, Yifeng Huang,