Magnetic Field Effect on Chemical Compositions of Magnetic Aerosol Particles Synthesized Photochemically from a Gaseous Mixture of Iron Pentacarbonyl and Trimethylsilyl Azide

• Published in: Aerosol science and technology Vol. 47; no. 11; pp. 1188 - 1195
• Main Authors: Morita, Hiroshi, Okano, Yoshinori, Šubrt, Jan
• Format: Journal Article
• Language: English
• Published: Colchester Taylor & Francis Group 01.11.2013; Taylor & Francis; Taylor & Francis Ltd
• Subjects: Aerosols; Airborne particulates; Atmospheric aerosols; Bridging; Carbonyls; Chemical reactions; Chemistry; Colloidal state and disperse state; Exact sciences and technology; Gases; General and physical chemistry; Iron; Magnetic fields; Nucleation; Partial pressure; Photochemistry; Magnetic field effect; Particle; Azides; Aerosols; Transition metal; Chemical composition; Iron; Mixture
• ISSN: 0278-6826; 1521-7388
• DOI: 10.1080/02786826.2013.829552

Under intense UV light irradiation with an Nd:YAG laser at 355 nm, a gaseous mixture of iron pentacarbonyl (Fe(CO) 5 ) and trimethylsilyl azide (TMSAz) produced aerosol magnetic particles with diameters of 50-100 nm. Two photon absorption of TMSAz and Fe(CO) 5 took place efficiently to produce trimethylsilyl nitrene and iron carbonyls (Fe(CO) n n = 1-4). In cases where a partial pressure of TMSAz was high, nucleation reactions of aerosol particles proceeded via chemical reactions between trimethylsilyl nitrene and two iron carbonyls, resulting in bridging between two iron carbonyls by silyl nitrene. In cases where a partial pressure of TMSAz was low, the nucleation reactions proceeded via chemical reactions between two iron carbonyls, resulting in the formation of di-iron carbonyls with bridging >C˭O group. Both of these nucleation reactions took place concurrently during aerosol particle formation. From FT-IR spectral change of sedimentary particles produced under an external magnetic field of up to 5 T, it was found that application of an external magnetic field accelerated the latter chemical reaction to result in the appearance of bridging ν(>C˭O) band in FT-IR spectrum of the magnetic particles. Copyright 2013 American Association for Aerosol Research