title: Unusual effect of the magnetic field component of the microwave radiation on aqueous electrolyte solutions.
abstract: The heating characteristics of aqueous electrolyte solutions (NaCl, KCl, CaCl2, NaBF4, and NaBr) of varying concentrations in ultrapure water by 2.45 GHz microwave radiation from a single-mode resonance microwave device and a semiconductor microwave generator were examined under conditions where the electric field (E-field) was dominant and where the magnetic field (H-field) dominated. Although magnetic field heating is not generally used in microwave chemistry, the electrolyte solutions were heated almost entirely by the microwaves' H-field. The heating rates under H-field irradiation at the higher concentrations of electrolytes (0.125 M to 0.50 M) exceeded the rates under E-field irradiation. This inversion phenomenon in heating is described in terms of the penetration depth of the microwaves. On the other hand, the action of the microwave radiation on ethylene glycol containing an electrolyte differed from that observed for water under E-field and H-field conditions.
authors.affiliation: Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyodaku, Tokyo 102-8554, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Horikoshi
authors.affiliation: Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioicho, Chiyodaku, Tokyo 102-8554, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Sumi
authors.affiliation: Gruppo Fotochimico, Dipartimento di Chimica, Universita di Pavia, via Taramelli 10, Pavia 27100, Italy.
authors.forename: Nick
authors.initials: N
authors.lastname: Serpone
mesh_terms: D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D004573:Electrolytes / Q000737:chemistry* / Q000528:radiation effects*; D004735:Energy Transfer / Q000528:radiation effects*; D006361:Heating / Q000379:methods*; D060526:Magnetic Fields; D008872:Microwaves; D008956:Models, Chemical; D011829:Radiation Dosage; D012996:Solutions / Q000737:chemistry / Q000528:radiation effects; D014867:Water / Q000737:chemistry*
chemical_list: D004573:Electrolytes; D012996:Solutions; D014867:Water