Co-Al 层状双氢氧化物的合成、阴离子交换和分层：剥离纳米片/聚阴离子复合膜的组装和磁光研究,Journal of the American Chemical Society

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Co-Al 层状双氢氧化物的合成、阴离子交换和分层：剥离纳米片/聚阴离子复合膜的组装和磁光研究
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2006-04-01 , DOI: 10.1021/ja0584471
Zhaoping Liu ₁ , Renzhi Ma ₁ , Minoru Osada ₁ , Nobuo Iyi ₁ , Yasuo Ebina ₁ , Kazunori Takada ₁ , Takayoshi Sasaki ₁

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本文系统研究了Co-Al层状双氢氧化物（LDH）的合成、阴离子交换和分层，旨在实现LDH纳米片/聚阴离子复合薄膜的制备和性能的阐明。在优化的反应条件下，采用尿素法合成了横向尺寸为4μm的Co-Al-CO3 LDH六方片晶。通过用 NaCl-HCl 混合溶液处理，制备的 CO3(2-)-LDH 转化为 Cl--LDH，保持其高结晶度和六边形片状形态。通过使用相应盐类的阴离子交换过程，由 Cl--LDH 进一步制备了插入各种阴离子（如 NO3-、ClO4-、乙酸盐、乳酸盐、十二烷基硫酸盐和油酸盐）的 LDH。发现各种阴离子形式的交换产物在甲酰胺中表现出不同的分层行为。其中，NO3--LDH 在剥离程度和剥离纳米片的质量方面观察到最好的结果。分层给出了粉红色的透明悬浮液，其中包含定义明确的纳米片，横向尺寸高达 2 微米。将所得纳米片与阴离子聚合物聚（苯乙烯 4-磺酸钠）（PSS）逐层组装到石英玻璃基板上以生产复合膜。磁性圆二色性 (MCD) 测量表明组装的多层膜表现出有趣的磁光响应。将所得纳米片与阴离子聚合物聚（苯乙烯 4-磺酸钠）（PSS）逐层组装到石英玻璃基板上以生产复合膜。磁性圆二色性 (MCD) 测量表明组装的多层膜表现出有趣的磁光响应。将所得纳米片与阴离子聚合物聚（苯乙烯 4-磺酸钠）（PSS）逐层组装到石英玻璃基板上以生产复合膜。磁性圆二色性 (MCD) 测量表明组装的多层膜表现出有趣的磁光响应。

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Synthesis, Anion Exchange, and Delamination of Co−Al Layered Double Hydroxide: Assembly of the Exfoliated Nanosheet/Polyanion Composite Films and Magneto-Optical Studies

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 mum in lateral size were synthesized by the urea method under optimized reaction conditions. The as-prepared CO3(2-)-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 microm. 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.

更新日期：2006-04-01

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