Nanocrystalline anatase TiO2 has been successfully synthesized using TiCl4 and O2 as precursors by atmospheric cold plasmas generated by dielectric barrier discharges (DBD) without extra heating or thermal treatment. For the TiO2 powders synthesized by DBD plasma at an energy density of 5.9 kJ · L−1, XRD and TEM analyses revealed that the nanocrystallite size is about 10–15 nm. Only a single crystalline structure of anatase was observed performing XRD, HRTEM and SAED measurements. It was found that the particle size decreased with increasing the discharge power, and that the chlorine contamination dramatically decreased when using high discharge power levels.magnified image

A series of Fe3O4‐PES ultrafiltration membranes with different mass ratios of Fe3O4 and PAA were prepared from suspensions, using the phase inversion process. The suspensions consisted of polyether sulfone (PES), dimethyl formamide, polyacrylic acid (PAA), and ferrosoferric oxide (Fe3O4). The separation properties of ultrafiltration membranes with different Fe3O4/PAA mass ratio were investigated by a cross‐flow experimental system. The Fe3O4/PAA mass ratio had little effect on the rejection of membranes to BSA. However, the pure water flux had a slight decline and then rised rapidly with the increase of Fe3O4/PAA mass ratio. An interesting phenomenon observed was that the Fe3O4 particles could diffuse into the nonsolvent bath during the formation of membrane, and the amount of Fe3O4 extracted into the nonsolvent bath nearly kept a constant mass ratio to PAA, even if the Fe3O4/PAA proportion was changed. The reasons of this interesting phenomenon were investigated. This result indicates that modified inorganic fillers may be used as the pore‐forming agent to prepare the porous membranes like the template leaching method. At the same time, this method does not use any strong acid or base. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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