title: Polyaniline/Fe3O4 nanoparticle composite: synthesis and reaction mechanism.
abstract: Polyaniline/Fe(3)O(4) nanoparticle composite was prepared by polymerizing aniline in the presence of Fe(3)O(4) nanoparticles upon the use of H(2)O(2) as oxidant. The polymerization was monitored by ultraviolet-visible absorption spectroscopy. The microstructure of the resultant composite was characterized by transmission electron microscopy. The molecular structure of the resultant polyaniline in the composite was investigated by both Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, while the magnetic property of the composite was characterized by vibrating sample magnetometer. Furthermore, the microwave absorption property of the resultant composite was measured in a frequency range of 2-18 GHz. Systematic investigations revealed that carboxylic acid in the buffer presented a determined role in the polymerization of aniline. To discover the role of carboxylic acid in the polymerization of aniline, more control experiments were designed and carried out by theoretical calculation in combination with electron spin resonance measurements. It was for the first time found out that carboxylic acid such as acetic acid and succinic acid can not only catalyze the polymerization of aniline but also facilitate the generation of hydroxyl radical via the decomposition of H(2)O(2).
authors.affiliation: Institute of Chemistry, Chinese Academy of Sciences (CAS), Zhong Guan Cun, Bei Yi Jie 2, Beijing 100190, China.
authors.forename: Chunhui
authors.initials: C
authors.lastname: Yang
authors.forename: Jingjie
authors.initials: J
authors.lastname: Du
authors.forename: Qian
authors.initials: Q
authors.lastname: Peng
authors.forename: Ruirui
authors.initials: R
authors.lastname: Qiao
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Chuanlai
authors.initials: C
authors.lastname: Xu
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Shuai
authors.forename: Mingyuan
authors.initials: M
authors.lastname: Gao
mesh_terms: D000814:Aniline Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008280:Magnetics; D008872:Microwaves; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D000814:Aniline Compounds; C416807:polyaniline; D052203:Ferrosoferric Oxide