A novel layered nanocomposite, C3F7-azo+/Ti4O92−, was prepared using the stripping/restacking method with K2Ti4O9 as the raw material and trans-[2-(2,2,3,3,4,4,4-heptafluorobutylamino) ethyl]-{2-[4-(4-hexyphenylazo) -phenoxy] ethyl}-dimethylammonium (hereinafter referred to as C3F7-azo+Br−) as the modifier. After modification on glassy carbon electrodes (GCE), it was used for simultaneous detection of ascorbic acid (AA) and uric acid (UA). The morphology and elemental composition of the nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). The electrochemical properties were measured and analyzed by differential pulse voltammetry (DPV), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Compared to single-component modified electrodes (K2Ti4O9/GCE, C3F7-azo+/GCE), the layered nanocomposite modified electrode (C3F7-azo+/Ti4O92−/GCE) exhibited a larger electrochemically active area (0.074 cm2), lower charge transfer resistance (94.0 Ω), and greater catalytic activity toward AA and UA. The detection limits were 0.39 μM for AA and 0.75 μM for UA, within the concentration ranges of 1.20–26.30 μM and 0.94–20.41 μM, respectively. The efficacy of C3F7-azo+/Ti4O92− was also demonstrated in real rabbit serum samples, with recoveries between 96.1% and 104.2%.
Xiao-Hong Zhang,Hai-Xia Wu,Lin Huang,Chuan-Jun Liu
In this paper, the hydrophilic p( N -hydroxyethylacrylamide) (PHEAA) brush was grafted from silicon wafer, followed by the decoration of C 3 F 7 groups with low surface energy to the side chains of PHEAA brush. The anti-adhesion performance of the modified surfaces was evaluated using Actinomyces naeslundii and Streptococcus mutans . For 4 h incubation, the silicon wafer with PHEAA brush (Si-PHEAA) was able to resist the adhesion of bacteria, while the anti-adhesion of the PHEAA-C 3 F 7 decorated silicon wafer (Si-PHEAA-C 3 F 7 ) had been improved. When the incubation time was extended to 24 h, the Si-PHEAA-C 3 F 7 still exhibited excellent adhesion-repellent property against bacteria. And among the Si-PHEAA-C 3 F 7 surfaces with 2.6%, 9% and 13% grafting degrees of C 3 F 7 , there was no obvious difference in anti-adhesion performance. The results indicated that the method of polymerization prior to decoration is easy to operate, moreover the prepared Si-PHEAA-C 3 F 7 possessed the long-term and high-efficiency anti-adhesion of bacteria ability.
危险品化学品经营许可证（带存储）