We report the synthesis of graphenes with tunable properties due to the growth of needlelike iron oxide (IO) nanoparticles on their surfaces. The electrical conductivity, flexibility, and magnetic properties of graphene nanosheets (GNSs) could be tuned on demand by fine controlling both the surface coverage and the length of the IO nanoneedles. The degree of coverage of the IO nanoparticles on the surface of the GNSs made it possible to control the resulting properties of the IO/GNSs on demand. As examples of their utility, paperlike materials were generated by simple filtration, and the resulting IO/GNS nanocomposites showed extraordinary removal capacity and fast adsorption rates for As(V) and Cr(VI) ions in water. Another possible application is the preparation of multifunctional films equipped with conductivity, flexibility, and magnetic properties. The fabrication process is easy to scale up at a low cost. In addition, both the colloidal solution and film forms of the resulting IO/GNSs were effective for removal of heavy metal ions, meaning this material could be utilized for actual industrial applications.
We developed a rapid and simple method for distinguish of Hanwoo and imported beef by capillary electrophoresis based on the single strand conformation polymorphism(SSCP-CE). PCR amplification was performed to amplify specific DNA regions spanning single nucleotide polymorphism(SNP) markers to determine between Hanwoo and imported beef. The SSCP ss-DNA fragments from the amplified PCR products were analyzed through the fusedsilica capillary(75 µm I.D. × 365 µm O.D.; effective length, 30 cm; total length, 50 cm) filled with the mixed polymer of 2.2%(w/v) poly(ethyleneoxide)(Mr 600 000) and 1.0%(w/v) poly(ethyleneoxide)(Mr 8 000 000) as a sieving matrix. Under the electric fields of 360 V/cm, Hanwoo and imported beef were simply distinguished within only 13 min by SSCP-CE.
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