alpha-FeOOH nanorods with diameters of 15-25 nm and lengths up to 170-300 nm were synthesized in high yield via a facile and template-free hydrothermal method at low temperature. After calcining the as-synthesized alpha-FeOOH at 250 degrees C for 2 h, we could obtain alpha-Fe2O3 nanorods. Interestingly, the as-obtained alpha-Fe2O3 nanorods exhibited weakly ferromagnetic characteristics at low temperature and superparamagnetic property at room temperature, which is different from the behavior of the corresponding bulk material.

Nanotechnology V 1505Facile Route to α-FeOOH and α-Fe 2 O 3 Nanorods and Magnetic Property of α-Fe2O3 Nanorods. -α-FeOOH nanorods (15-25 nm in diameter, 170-300 nm length) are synthesized in high yield by a simple, template-free hydrothermal method starting with FeSO4 and NaOAc (H2O, 100°C, autoclave, 8 h). α-Fe2O3 nanorods can be produced from the as-synthesized α-FeOOH nanorods by calcination (air, 250°C, 2 h). The α-Fe 2 O 3 nanorods exhibit weakly ferromagnetic characteristics at low temperature (5 K) and superparamagnetic behavior at room temperature, which differs from the behavior of the bulk material. -(TANG*, B.; WANG, G.; ZHUO, L.; GE, J.; CUI, L.; Inorg. Chem. 45 (2006) 13, 5196-5200; Coll. Chem., Chem. Eng. Mater. Eng., Shandong Norm. Univ., Jinan 250014, Peop. Rep. China; Eng.) -Schramke 38-198

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It was found that cadmium telluride (CdTe) quantum dots (QDs) with different sizes can have a great sensitizing effect on chemiluminescence (CL) emission from luminol-potassium periodate (KIO4) system. Levodopa, a widely prescribed drug in the treatment of Parkinson's disease, could inhibit luminol-KIO4-CdTe QDs CL reaction in alkaline solution. The inhibited CL intensity was proportional to the concentration of levodopa in the range from 8.0 nM to 10.0 μM. The detection limit was 3.8 nM. This method has been successfully applied to determine levodopa in pharmaceutical preparation and human urine and plasma samples with recoveries of 94.1-105.4%. This was the first work for inhibition effect determination of levodopa using a QD-based CL method.