TY - JOUR
T1 - The potential of magnetic heating for fabricating Pickering-emulsion-based capsules
AU - Bielas, Rafał
AU - Surdeko, Dawid
AU - Kaczmarek, Katarzyna
AU - Józefczak, Arkadiusz
PY - 2020/8
Y1 - 2020/8
N2 - Pickering emulsions (particle-stabilized emulsions) have been widely explored due to their potential applications, one of which is using them as precursors for the formation of colloidal capsules that could be utilized in, among others, the pharmacy and food industries. Here, we present a novel approach to fabricating such colloidal capsules by using heating in the alternating magnetic field. When exposed to the alternating magnetic field, magnetic particles, owing to the hysteresis and/or relaxation losses, become sources of nano- and micro-heating that can significantly increase the temperature of the colloidal system. This temperature rise was evaluated in oil-in-oil Pickering emulsions stabilized by both magnetite and polystyrene particles. When a sample reached high enough temperature, particle fusion caused by glass transition of polystyrene was observed on surfaces of colloidal droplets. Oil droplets covered with shells of fused polystyrene particles were proved to be less susceptible to external stress, which can be evidence of the successful formation of capsules from Pickering emulsion droplets as templates.
AB - Pickering emulsions (particle-stabilized emulsions) have been widely explored due to their potential applications, one of which is using them as precursors for the formation of colloidal capsules that could be utilized in, among others, the pharmacy and food industries. Here, we present a novel approach to fabricating such colloidal capsules by using heating in the alternating magnetic field. When exposed to the alternating magnetic field, magnetic particles, owing to the hysteresis and/or relaxation losses, become sources of nano- and micro-heating that can significantly increase the temperature of the colloidal system. This temperature rise was evaluated in oil-in-oil Pickering emulsions stabilized by both magnetite and polystyrene particles. When a sample reached high enough temperature, particle fusion caused by glass transition of polystyrene was observed on surfaces of colloidal droplets. Oil droplets covered with shells of fused polystyrene particles were proved to be less susceptible to external stress, which can be evidence of the successful formation of capsules from Pickering emulsion droplets as templates.
KW - Alternating magnetic field
KW - Colloidal capsules
KW - Magnetic heating
KW - Magnetic particles
KW - Pickering emulsions
KW - Specific absorption rate
KW - UT-Hybrid-D
UR - http://www.scopus.com/inward/record.url?scp=85083885822&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfb.2020.111070
DO - 10.1016/j.colsurfb.2020.111070
M3 - Article
AN - SCOPUS:85083885822
SN - 0927-7765
VL - 192
JO - Colloids and surfaces B: Biointerfaces
JF - Colloids and surfaces B: Biointerfaces
M1 - 111070
ER -