Stabilization of pickering emulsions by generating complex colloidal layers at liquid-liquid interfaces

Title
Stabilization of pickering emulsions by generating complex colloidal layers at liquid-liquid interfaces
Author
김진웅
Keywords
Pickering emulsion; Nanoparticles; Complex colloidal layer; Emulsion gel phase
Issue Date
2014-01
Publisher
Elsevier B.V
Citation
Journal of Colloid And Interface Science, 413, 100-105
Abstract
Typical Pickering emulsions accumulate particles to form a robust colloidal layer at an immiscible liquid?liquid interface. However, if the particles are smaller than tens of nanometers, they have a tendency toward coming off from the interface, thereby destabilizing emulsion drops. To solve this problem, a technique that can make the adsorbed nanoparticles stay at the interface should be developed. This study introduces a practical method that allows us to obtain a mechanically stable Pickering emulsions; n-decane was emulsified to form an oil-in-water emulsion of which interface was stabilized with a complex colloidal layer consisting of 12nm-sized silica nanoparticles, a poly(vinyl alcohol) binder, and an alkyl-chained silane coupling agent. We have found that in the conditions of high salinity, the emulsion drops attract each other and form an emulsion gel phase. However, even in such harsh conditions, the complex silica layer maintains its original structure at the interface, thus stabilizing the emulsion drop against coalescence.
URI
http://www.sciencedirect.com/science/article/pii/S0021979713008448?via%3Dihubhttp://hdl.handle.net/20.500.11754/47103
ISSN
0021-9797
DOI
10.1016/j.jcis.2013.09.015
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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