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- W2003793075 abstract "A microchip module with integrated flow channel and highly sensitive thin-film thermoelements of Bi0.87Sb0.13 and Sb was developed in order to realize a microcalorimeter for small volumes and flows in the μl and μl/min range, respectively. It was designed according to the principle of flow-injection analysis (FIA) and prepared using means of micromachining technology. The flow channel comprises two inlets, a mixing region, a measurement region and one outlet. In this way, the initiation of chemical reactions by interdiffusion takes place in the closest possible contact with the sensing elements. Three thermopiles (i.e. thermoelements connected in series) are arranged on a thin-film membrane covering the fluid channel. A thin-film heater of an NiCr alloy is integrated for internal electrical calibration. The microreactor was first tested in the neutralization reaction between sodium hydroxide and sulphuric acid for different NaOH concentrations, flows, and sample volumes, investigating for the present the integral signal of the three thermopiles connected in series. From the collected data, the minimum detectable power, minimum detectable NaOH concentration, and the reaction enthalpy were calculated. The results characterize the module as a sensitive chip calorimeter, showing the suitability of the micromachining technology for calorimetry." @default.
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- W2003793075 date "1998-02-01" @default.
- W2003793075 modified "2023-10-17" @default.
- W2003793075 title "Chip reactor for microfluid calorimetry1Presented at the Twelfth Ulm-Freiberg Conference, Freiberg, Germany, 19–21 March 19971" @default.
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- W2003793075 doi "https://doi.org/10.1016/s0040-6031(97)00381-x" @default.
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