TY - JOUR
T1 - Influence of the particle type on the rheological behavior of Pickering emulsions
AU - Chen, J.
AU - Vogel, R.
AU - Werner, S.
AU - Heinrich, G.
AU - Clausse, D.
AU - Dutschk, V.
N1 - Funding Information:
This research was supported by Sasol Germany, COST Actions D43 und P21 and the ESA project FASES ‘Fundamental and Applied Studies in Emulsion Stability’ AO-99-052. We are grateful to Audrey Drelich (Département Génie Chimique, Génie des Procédés Industriels, Université de Technologie, Compiègne, France) for her kind support by DSC measurements.
PY - 2011/6/5
Y1 - 2011/6/5
N2 - In order to get a better understanding of potential relationships among the microstructure and stability of Pickering emulsions, rheological studies were performed using differently modified disperable colloidal Boehmite alumina nanoparticles. Hysteresis loop measurements and dynamic (oscillatory) rheological measurements on two different emulsion systems were carried out in linear and non-linear regime at different storage time. Differential scanning calorimetry (DSC) results, transmission electron microscopy (TEM) and optical microscopy images of these emulsion systems were additionally analysed in respect to reveal the emulsions type and their microstructure. Pickering emulsion stabilized by moderately hydrophobic particles exhibited inhomogeneous structure, relative large yield stresses and thixotropic flow behavior, indicating a formation of a three-dimensional network. Emulsion stabilized by rather hydrophobic particles with a contact angle around 90°, was revealed to be an oil-in-water-in-oil multiple emulsion. The emulsion was homogenous and showed thixotropy, indicating the presence of a three-dimensional network. However, a phase separation slightly occurred in the storage time evaluated meaning that the stability of this emulsion need be improved.
AB - In order to get a better understanding of potential relationships among the microstructure and stability of Pickering emulsions, rheological studies were performed using differently modified disperable colloidal Boehmite alumina nanoparticles. Hysteresis loop measurements and dynamic (oscillatory) rheological measurements on two different emulsion systems were carried out in linear and non-linear regime at different storage time. Differential scanning calorimetry (DSC) results, transmission electron microscopy (TEM) and optical microscopy images of these emulsion systems were additionally analysed in respect to reveal the emulsions type and their microstructure. Pickering emulsion stabilized by moderately hydrophobic particles exhibited inhomogeneous structure, relative large yield stresses and thixotropic flow behavior, indicating a formation of a three-dimensional network. Emulsion stabilized by rather hydrophobic particles with a contact angle around 90°, was revealed to be an oil-in-water-in-oil multiple emulsion. The emulsion was homogenous and showed thixotropy, indicating the presence of a three-dimensional network. However, a phase separation slightly occurred in the storage time evaluated meaning that the stability of this emulsion need be improved.
KW - Pickering emulsions
KW - Rheological behavior
KW - Thixotropy
KW - n/a OA procedure
UR - http://www.scopus.com/inward/record.url?scp=79956021230&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2011.02.003
DO - 10.1016/j.colsurfa.2011.02.003
M3 - Article
SN - 0927-7757
VL - 382
SP - 238
EP - 245
JO - Colloids and surfaces A: Physicochemical and engineering aspects
JF - Colloids and surfaces A: Physicochemical and engineering aspects
IS - 1-3
ER -