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In this contribution, a multicommutated flow analysis (MCFA) system for immunoprecipitation assays is presented. The developed bioanalytical system constructed from microsolenoid devices coupled with an optoelectronic flow-through nephelometric detector is sufficient to monitor the kinetics of antigen–antibody interactions, the effect of which is turbidity. Because of the uncommon shape of the immunoprecipitation response curve, the developed MCFA system contains a special module for on-line dilution of the analyzed samples and for single-standard calibration. As a model analyte and an immunoreceptor for the presented investigations, human albumin and antibody for this albumin were used, respectively. The proposed MCFA system is characterized by robust construction, low reagent consumption (maximum 42 μL of undiluted reagent for the analysis of one sample) and relatively high throughput under optimal conditions (approximately 18 measurements per hour). The analytical usefulness of the developed MCFA system for clinical analysis has been experimentally confirmed. Samples of human urine were analyzed for the needs of microalbuminuria diagnostics and satisfactory analytical results have been obtained. [ABSTRACT FROM AUTHOR]

Single crystalline copper selenide (Cu2−xSe) nanocrystals (NCs) with well-defined octahedral morphology are successfully synthesized by a colloidal hot-solution injection method from the reaction of anhydrous CuCl with Ph2Se2 under argon flow, in which 1-octadecene (ODE) and oleylamine (OAm) are used as solvent and surfactant, respectively. The Cu2−xSe octahedral nanostructures are characterized by XRD, SEM, TEM, HRTEM, SAED, EDS, FT-IR and XPS and it is found that they are in the cubic phase with high quality. The growth process of the nanostructures is investigated and it is noted that reaction temperature, reaction time and capping surfactant OAm play significant roles in controlling the morphologies of the final products. Meanwhile, the current–voltage (I–V) behavior of the as-prepared octahedral Cu2−xSe nanostructures is explored for the first time and it is found that the Cu2−xSe octahedral nanostructures are promising candidates for application in photodetection and related areas. [ABSTRACT FROM AUTHOR]

The photoresponse of a TiO2 thin film was significantly improved due to the decrease in the Schottky barrier height between Au and TiO2via the formation of interface dipoles, which was caused by electrostatically self-assembled PEI on the surface of the TiO2 film. [ABSTRACT FROM AUTHOR]