The microwave absorption of emulsions containing aqueous micro- and nanodroplets: a means to optimize microwave heating.
The microwave absorption at frequencies between 10 MHz and 4 GHz is measured for aqueous brine droplets dispersed in a dielectric medium (epsilon(')=2.0). By varying the size of the droplets, ion type and ion concentration, it is found that the microwave absorption goes through a maximum which depends on the type of ions and their concentration. The absorption process is attributed to the polarization of the microdroplets through surface charges. Means to optimize microwave heating in emulsions is discussed.
Holtze
Christian
C
Max Planck Institute of Colloids and Interfaces, Department of Colloid Chemistry, Research Campus Golm, D-14424 Potsdam, Germany.
Sivaramakrishnan
R
R
Antonietti
Markus
M
Tsuwi
J
J
Kremer
Friedrich
F
Kramer
Klaus D
KD
D025802:Electric Capacitance; D004655:Emulsions / Q000737:chemistry* / Q000528:radiation effects*; D006361:Heating; D008872:Microwaves; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects*; D010316:Particle Size; D012492:Salts / Q000737:chemistry / Q000528:radiation effects; D013499:Surface Properties; D014867:Water / Q000737:chemistry
D004655:Emulsions; D012492:Salts; C017082:brine; D014867:Water