Surfactant directed synthesis of calcium aluminum layered double hydroxides nanoplatelets

Reverse Micelle Synthesis of Colloidal Nickel–Manganese Layered Double Hydroxide Nanosheets and Their Pseudocapacitive Properties

“…Recently, a reverse micelle method has been employed to synthesize colloidal LDH nanoplatelets, which typically involves the introduction of an aqueous phase containing metal precursors into an oil phase to form droplets surrounded by self-assembled surfactant molecules. [17][18][19][20][21][22][23] The droplets serve as nanoreactors with limited space for controlled growth of LDH nanosheets. This reverse micelle method has enabled the preparation of LDH nanoplatelets with controlled thickness and diameter.…”

“…Compared to other layered solids, however, exfoliation of LDHs is rather difficult due to strong interlayer electrostatic interactions, which arise from the high charge density of LDH layers and the high content of intercalated anions. Recently, a reverse micelle method has been employed to synthesize colloidal LDH nanoplatelets, which typically involves the introduction of an aqueous phase containing metal precursors into an oil phase to form droplets surrounded by self‐assembled surfactant molecules 17–23. The droplets serve as nanoreactors with limited space for controlled growth of LDH nanosheets.…”

“…For example, colloidal Mg–Al, Ca–Al, and Co–Al LDH nanosheets have been synthesized by an isooctane‐based reverse micelle method 17–20. 22, 23 Most of these syntheses, however, require long reaction times (1–4 days) and adjustment of the pH value of the reaction solution (usually ≥10). In this work, we developed an alternative, facile reverse micelle method to synthesize colloidal LDH nanosheets composed of Ni 2+ and Mn 3+ cations, which are promising candidates for pseudocapacitor electrode materials.…”

Progress in layer-by-layer assembly method of nanocomposite film based on layered double hydroxides

“…层纳米片堆垛形成. Sasaki课题组 [13] 纳米片, 如在丁醇 [10] 、 丙烯酸酯 [16] 、 CCl 4 [17] 、 甲苯 [18,19] 、 甲酰胺 [11,13] 、 N,N-二甲基甲酰胺/乙醇混合液 [20] 、 水 [12] 和二甲亚砜 [21] 等溶剂中剥离, O'Hare课题组 [22] 通过 十二烷基硫酸钠DDS形成反胶束调控LDH的成核和 生长得到了直径在18~100 nm, 厚度约为5 nm的CaAl LDHs纳米片. 通过自下而上的方法也可获得LDHs 纳 米 片 , 如 Hu 等 人 [23,24] 用 一 步 法 直 接 合 成 MgAl-LDHs 纳米片, 并通过AFM表明可得到单层的LDHs 纳米片(0.47 nm), 且此方法也可用于NiAl-LDHs [25] 和CoAl-LDHs [26] 纳米片的制备.…”

Assembly of luminescent ordered multilayer thin-films based on oppositely-charged MMT and magnetic NiFe-LDHs nanosheets with ultra-long lifetimes

“…Layered materials have attracted attentions to their rich fundamental physics and potential applications in future multifunctional devices, and the nanosheets of those have been used as building units for making new designed organic-inorganic or inorganic-inorganic nanomaterials due to their intrinsic unique two-dimensional structure 1 2 3 4 5 6 7 . LDHs and MMT, the inorganic layered minerals containing ionic nanosheets, have partially been widely applied in sensing, catalysis and energy storage etc 8 9 10 11 12 13 .…”