化学
离子交换
纳米片
氢氧化物
化学工程
复合数
材料科学
磺酸盐
结晶度
层状结构
剥脱关节
无机化学
层状双氢氧化物
插层(化学)
离子
高分子化学
结晶学
石墨烯
复合材料
钠
有机化学
工程类
作者
Zhaoping Liu,Renzhi Ma,Minoru Osada,Nobuo Iyi,Yasuo Ebina,Kazunori Takada,Takayoshi Sasaki
摘要
This paper describes a systematic study on the synthesis, anion exchange, and delamination of Co−Al layered double hydroxide (LDH), with the aim of achieving fabrication and clarifying the properties of LDH nanosheet/polyanion composite films. Co−Al−CO3 LDH hexagonal platelets of 4 μm in lateral size were synthesized by the urea method under optimized reaction conditions. The as-prepared CO32--LDH was converted to Cl--LDH by treating with a NaCl−HCl mixed solution, retaining its high crystallinity and hexagonal platelike morphology. LDHs intercalated with a variety of anions (such as NO3-, ClO4-, acetate, lactate, dodecyl sulfate, and oleate) were further prepared from Cl--LDH via an anion-exchange process employing corresponding salts. Exchanged products in various anion forms were found to show different delamination behaviors in formamide. Among them, best results were observed for NO3--LDH in terms of the exfoliating degree and the quality of the exfoliated nanosheets. The delamination gave a pink transparent suspension containing well-defined nanosheets with lateral sizes of up to 2 μm. The resulting nanosheets were assembled layer-by-layer with an anionic polymer, poly(sodium styrene 4-sulfonate) (PSS), onto quartz glass substrates to produce composite films. Magnetic circular dichroism (MCD) measurements revealed that the assembled multilayer films exhibited an interesting magneto-optical response.
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