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Reverse-vesicle formation of organic-inorganic polyoxometalate-containing hybrid surfactants with tunable sizes

机译:尺寸可调的有机-无机多金属氧酸盐杂化表面活性剂的反泡形成

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摘要

The formation of reverse-vesicular structures of the polyoxometa-late- containing hybrid surfactants [nBu_4N]_3[MnMo _6O_(18){(OCH_2)_3-CNHCO(CH _2)_(n-2)CH_3}_2] (Mn-Anderson-C _n, n=6, 16) in nonpolar medium was achieved by titrating toluene into Mn-Anderson-C_n/acetonitrile (MeCN) solution. Stepwise change of the solvent polarity induces self-association of the hydrophilic Mn-Anderson cluster on the hybrid amphiphiles. The reverse-vesicle formation was characterized by laser light scattering and further confirmed by transmission electron microscopy techniques, and the vesicle sizes increase with increasing toluene contents. The assembly process was accelerated at an elevated temperature. The length of the alkyl tails on the hybrid surfactants has a minor effect on the vesicle sizes, because the strong attraction between the polyoxometalate clusters is more dominant in the reverse-vesicle formation.
机译:含聚氧肟酸酯的杂化表面活性剂[nBu_4N] _3 [MnMo _6O_(18){(OCH_2)_3-CNHCO(CH _2)_(n-2)CH_3} _2](Mn-通过将甲苯滴定到Mn-Anderson-C_n /乙腈(MeCN)溶液中,可在非极性介质中获得Anderson-C_n(n = 6,16)。溶剂极性的逐步变化会引起亲水性Mn-Anderson簇在杂化两亲物上的自缔合。反向囊泡形成的特征在于激光散射,并通过透射电子显微镜技术进一步证实,并且囊泡大小随甲苯含量的增加而增加。在升高的温度下加速了组装过程。杂化表面活性剂上烷基尾的长度对囊泡大小影响较小,因为在反囊形成过程中,多金属氧酸盐簇之间的强烈吸引力更为明显。

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