期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 228, 期 1-3, 页码 159-170出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0927-7757(03)00357-1
关键词
FFEM; temperature control; bicontinuous microemulsions; microstructure; trajectory; droplet to bicontinuous transition; phase behavior
New images by freeze fracture electron microscopy (FFEM) are obtained for microemulsions in the ternary system water-noctane-C12E5 as function of varying water-to-oil ratio. The surfactant concentration is chosen such that the composition of the sample is close to the (X) over tilde -point, i.e. the point of highest efficiency, where the three- and the one-phase regions meet. As the phase behavior and thus the microstructure of these particular nonionic microemulsions are extremely sensitive to temperature, a precise temperature control of the sample was necessary prior to rapid freezing in liquid ethane. The images presented are the first FFEM images along the trajectory of the middle-phase in phase space. Of particular interest is the structure of the microemulsion on the water-rich side not visualized so far. The images give strong evidence that even at the highest water and oil contents, respectively, elements of a bicontinuous microstructure are visible, which confirms results obtained by means of various other techniques. (C) 2003 Elsevier B.V. All rights reserved.
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