Aluminum‐doped strontium hexaferrite nanoparticle SrAl1.3Fe10.7O19 was prepared by sol–gel method and polyaniline (PANi) multiphase magnetic nanocomposite SrAl1.3Fe10.7O19/MWCNT/PANi was synthesized through a sonochemical method by in situ polymerization. The morphology, structure, and magnetic properties of the nanocomposites are investigated by field emission scanning electron microscopy, X‐ray powder diffraction, Fourier transform infrared spectroscopy, and vibrating sample magnetometer. The electromagnetic interference shielding efficiency was evaluated in the KU‐band (12.4–18 GHz). The reflection loss (RL) value showed that the composites have an excellent absorbing property in the KU‐band, minimum −24.93 dB at 16.40 GHz with a bandwidth of 2.81 GHz (shielding effectiveness up to 10 dB) at a matching thickness 6.5 mm. The RL value of the SrAl1.3Fe10.7O19/MWCNT nanocomposite was −15.92 dB at 15.84 GHz with a bandwidth of 1.66 GHz (with a shielding effectiveness up to 10 dB). These results disclose the remarkable microwave shielding ability of SrAl1.3Fe10.7O19/MWCNT/PANi in KU‐band due to the interactive effect of the three components. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45135.

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Dispersive liquid-liquid microextraction as a rapid, simple and efficient method coupled with high performance liquid chromatography-UV-Vis detection was used for sample preparation and subsequent determination of carbazole, tri nitro carbazole (TrNC) and tetra nitro carbazole in water samples. The influence of several important variables on the extraction efficiency has been evaluated. The methods works best with chloroform as an extractant and acetonitrile as the dispersive solvent. Under optimum conditions, the calibration curve is linear in the range from 0.007 to 1.75 μg mL −1 for TNC, 0.006 to 1.52 μg mL −1 for TrNC, and 0.008-2.10 μg mL −1 for carbazole. The limits of detection (LODs;at a signal-to-noise ratio of 3), range from 1.7 to 1.1 ng mL −1 , for TNC, TrNC and carbazole. Also, the relative standard deviations (RSD, n 06) for the extraction of TNC (at 174 ng mL −1 ), TrNC (at 151 ng mL −1 ) and carbazole (at 84 ng mL −1 ) vary between 4.1 and 5.2%. The enrichment factors range from 179 to 186. The method was successfully applied to the determination of TNC, TrNC and carbazole in environmental samples.

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