层状复合的仿生设计与装配论述.ppt

Bioinspired Design and Assembly of Layered Composite Materials Members 张西伦 S 于洋 S赵兴云 S 江鹏 S陈思铭 S 万智阳 S曹加锋 B王康平 SIndex Background of “nacre” Methods and Parameters Materials Synthesis Interfacial Chemistry Future Background of “nacre” Yao. Chem. Soc. Rev., 2011, Cheng, Chem. Soc. Rev., 2012, inorganic minerals (95 wt% brittle) organic biopolymers (5 wt% soft) Excellent composite materials (high strength high toughness) How ? Yao, . Chem. Soc. Rev., 2011 Wegst. Nat.mater. 2014. Nanoasperities Biopolymer Mineral bridges Yao,Adv. Mater. 2014 Background of “nacre” Methods and Parameters Yao,Adv. Mater. 2014 Materials Synthesis GO DA LDH CS MTM PVA Inorganic oxide DA PVA Refractive index: 1.49 ~ 1.52. Thermal conductivity: 0.2w/ (m·K). Specific heat capacity: 1 ~ 5kJ/ (kg· K). Resistivity: (3.1～3.8)×10Ω·cm. MTM (Al,Mg)2[Si4O10](OH)2·nH2O Mohs scale hardness 1–2 Luster Dull, earthy Diaphaneity Translucent Specific gravity 1.7-2 Optical properties Biaxial (-) Refractive index n= 1.485–1.535 CS (C6H11NO4)n GO/DA Cui et al.,Acsnano. 2014 Covlent bond GO/PVA PVA (1 g) was dissolved in DI water (99 g) at 90 ° C for 1 h GO was synthesized from graphite powder by the modified Hummer’s method R-PVA/GO films were directly immersed into an HI solution Liao,Adv. Mater. 2012 Hydrogen bond MTM/NFC/PVA Wang,Acsnano. 2014 MTM/CS Yao,Angew. Chem. Int. Ed. 2010 Vacuum-filtration-induced self-assembly Water-evaporation-induced self-assembly Na-MTM in water (0.5 wt%) was stirred ,centrifuged Chitosan was dissolved inaqueous solution of glacial acetic acid MTM and chitosan were mixed ,stirring. centrifugation , washed Electrostatic attraction Hydrogen bond LDH/CS CS: Spin Coating the silylanized LDH platelets ATES, methanol, deionized water were mixed and stirred for 1 h. Adding LDH to the mixture, then stirred for 5 min. Yao,Angew. Chem. I