The effect of ionic strength on the structural organization of dioctadecyldimethylammonium bromide in aqueous solution

机译：离子强度对水溶液中二十八烷基二甲基溴化铵结构结构的影响

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High-curvature and stabilized vesicles of dioctadecyldimethylammonium bromide (DODABr) can be formed spontaneously in aqueous electrolytic solution. It is shown by cryo-transmission electron microscopy that 5.0 mM DODABr molecules associate in water at a temperature above its gel-to-liquid-crystalline phase transition temperature (T_m～45℃) in a variety of complex bilayer structures. However, in the presence of NaCl the preferred structures formed are un-ilamellar and bilamellar vesicles with high curvature and the dispersion is polydisperse in size and geometry, but the main vesicle population contains spherical, flattened and smoothed structures. It is, however, less polydisperse than the corresponding salt-free dispersion, and the size polydispersity and the vesicle curvature radius tend to decrease with NaCl concentration. Long cylindrical bilamellar vesicles, with a very thin water layer separating the bilayers are also formed in the presence of 10 mM NaCl. The effect of the ionic strength on T_m, obtained by differential scanning calorimetry, is shown to depend on the nature of the counterion: Br~- decreases, whereas Cl~- increases T_m of DODABr, indicating different affinity of these counterions for the vesicle surfaces.

机译：二十八烷基二甲基溴化铵（DODABr）的高曲率和稳定囊泡可以在水溶液中自发形成。低温透射电子显微镜显示，在多种复杂的双层结构中，温度高于其凝胶-液晶相变温度（T_m〜45℃）时，水中有5.0 mM DODABr分子缔合。然而，在存在NaCl的情况下，形成的优选结构是具有高曲率的单层和层状囊泡，并且分散体的大小和几何形状是多分散的，但是主要囊泡群包含球形，扁平和光滑的结构。然而，其多分散性小于相应的无盐分散体，并且尺寸多分散性和囊泡曲率半径倾向于随NaCl浓度而降低。在存在10 mM NaCl的情况下，还会形成长圆柱状的单层小泡，其中的水层非常薄，将双分子层隔开。通过差示扫描量热法获得的离子强度对T_m的影响显示出取决于抗衡离子的性质：Br〜-降低，而Cl〜-增加DODABr的T_m，表明这些抗衡离子对囊泡表面的亲和力不同。

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来源
《International Conference on Surface and Colloid Science; 200309; Brazil》|2003年|P.163-168|共6页
会议地点 Brazil
作者
Eloi Feitosa; Paula Cristina Alves Barreleiro;
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作者单位

Physics Department, IBILCE/UNESP, Rua Cristovao Colombo, 2265, 15054-000, Sao Jos do Rio Preto, SP, Brazil;

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会议组织
原文格式 PDF
正文语种 eng
中图分类工程材料一般性问题;
关键词
cryo-transmission electron microscopy; micro differential scanning calorimetry; cationic vesicles; vesicle curvature; gel-to-liquid-crystalline phase transition temperature;

机译：低温透射电镜；微差示扫描量热法；阳离子囊泡；囊泡曲率；凝胶-液晶相变温度;

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The effect of ionic strength on the structural organization of dioctadecyldimethylammonium bromide in aqueous solution

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