This paper reports that structurally positively charged layered double hydroxides （LDHs） nanoparticles induce the vesicle formation in a mixture of a zwitterionic surfactant, lauryl sulfonate betaine （LSB）, and an...This paper reports that structurally positively charged layered double hydroxides （LDHs） nanoparticles induce the vesicle formation in a mixture of a zwitterionic surfactant, lauryl sulfonate betaine （LSB）, and an anionic surfactant, sodium dodecyl benzenesulfonate （SDBS）. The existence of vesicles was demonstrated by negative-staining （NS-TEM） and freeze-fracture （FF-TEM） transmission electron microscopy and confocai laser scanning microscopy （CLSM）. The size of vesicles increased with the increase of volume ratio （Q） of Mg3A1-LDHs sol to the SDBS/LSB solution. A new composite of LDHs nanoparticles encapsulated in vesicles was formed. A possible mechanism of LDHs-induced vesicle formation was suggested. The positive charged LDHs surface attracted negatively charged micelles or free amphiphilic molecules, which facilitated their aggregation into a bilayer membrane. The bilayer membranes could be closed to form vesicles that have LDHs particles encapsulated. It was also found that an adsorbed compound layer of LSB and SDBS micelles or molecules on the LDHs surface played a key role in the vesicle formation.展开更多
基金Project supported by Taishan Scholar Foundation of Shandong Province of China （No. ts20070713）, the Natural Science Foundation of Shandong Province of China （Nos. Z2008B08, 2009ZRB01722） and the National Natural Science Foundation of China （No. 50772062）.
文摘This paper reports that structurally positively charged layered double hydroxides （LDHs） nanoparticles induce the vesicle formation in a mixture of a zwitterionic surfactant, lauryl sulfonate betaine （LSB）, and an anionic surfactant, sodium dodecyl benzenesulfonate （SDBS）. The existence of vesicles was demonstrated by negative-staining （NS-TEM） and freeze-fracture （FF-TEM） transmission electron microscopy and confocai laser scanning microscopy （CLSM）. The size of vesicles increased with the increase of volume ratio （Q） of Mg3A1-LDHs sol to the SDBS/LSB solution. A new composite of LDHs nanoparticles encapsulated in vesicles was formed. A possible mechanism of LDHs-induced vesicle formation was suggested. The positive charged LDHs surface attracted negatively charged micelles or free amphiphilic molecules, which facilitated their aggregation into a bilayer membrane. The bilayer membranes could be closed to form vesicles that have LDHs particles encapsulated. It was also found that an adsorbed compound layer of LSB and SDBS micelles or molecules on the LDHs surface played a key role in the vesicle formation.
