Enhanced Stabilization of Vesicles by Compressed CO2
Li, Wei; Zhang, Jianling; Cheng, Siqing; Han, Buxing; Zhang, Chaoxing; Feng, Xiaoying; Zhao, Yueju
Source PublicationLANGMUIR
AbstractIn this work, we studied the effect of compressed CO2 on the stability of vesicles formed in a dodecyltrimethylammonium bromide (DTAB)/sodium dodecyl sulfate (SDS) mixed surfactant system by combination of phase behavior and turbidity study, and UV-vis and fluorescence techniques. It was discovered that compressed CO2 could enhance the stability of vesicles significantly. This new and effective method. to stabilize vesicles has some unique advantages over conventional methods. For example, the size and stability of the vesicles can be easily controlled by CO2 pressure; the method is greener because CO2 is a green reagent and it can be released completely after depressurization, which simplifies postseparation processes in applications. The main reason for CO2 to stabilize the vesicles is that CO2 molecules can insert into the hydrophobic bilayer region to enhance the rigidity of the vesicle film and reduce the size of the vesicles, which is different from that of conventional cosolvents (e.g., alcohols) used to stabilize vesicles. On the basis of this discovery, we developed a method to prepare hollow silica spheres using tetraethoxysilane as the precursor and CO2-stabilized vesicles as the template, in which CO2 acts as both the stabilizer of the vesicular template and the catalyst for the hydrolysis reaction of the precursor, and other cosolvents and catalysts are not required. Besides, the size of the silica hollow spheres prepared can be controlled by the pressure Of CO2.
Indexed BySCI
WOS IDWOS:000262176600039
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Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorHan, Buxing
AffiliationChinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Li, Wei,Zhang, Jianling,Cheng, Siqing,et al. Enhanced Stabilization of Vesicles by Compressed CO2[J]. LANGMUIR,2009,25(1):196-202.
APA Li, Wei.,Zhang, Jianling.,Cheng, Siqing.,Han, Buxing.,Zhang, Chaoxing.,...&Zhao, Yueju.(2009).Enhanced Stabilization of Vesicles by Compressed CO2.LANGMUIR,25(1),196-202.
MLA Li, Wei,et al."Enhanced Stabilization of Vesicles by Compressed CO2".LANGMUIR 25.1(2009):196-202.
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