Reactants injection strategy

Reactant and energy injection strategy, as one-shut (batch), continuous pulsed injection, reversed flow, staged injection, and use of a membrane. 

Nowadays, there is a satisfactory description of physical dispersion in single-channel flow injection systems in which artefacts do not play a pronounced role in the process. Numerous attempts have been made to extend the model to situations involving chemical reactions. In general, the strategy is to consider modifications to the concentrations of the reactant species and Dm. These parameters refer initially only to the main reactants but, as the chemical reactions proceed, Dm of the formed products (and their instant concentrations) should be also taken into account [55]. For a complete description of flow systems comprising several confluent streams, Eqs. 3.4 and 3.10—3.12 should be combined. 

A key aspect of the design strategy for this reactor system is to enable quantification of reaction kinetics with a steady-state mass balance model of the reactor. This is enabled only if the injected finite pulses are adequately large in volume to provide a volume at the point of analytical sampling that contains the reactants and products at the steady-state concentrations (i.e., not diluted by axial dispersion into the carrier stream before and after the finite pulse). Acceptable and unacceptable levels of axial dispersion are illustrated in Fig. 13.2, a plot of concentration (y-axis) as a function of distance traveled by the pulse (%-axis). Given an adequately large... 

Li et al. also reported the colloidal synthesis of Co-doped CdSe nanowires by the SLS strategy using the same reactants, except (MnSt)2 was replaced by cobalt stearate (CoSt)2 and the injection temperature was increased to 280°C. As-grown Co Cdi. Se (x = 0.3%) NWs were of 17.7 1.9nm in diameter and 1.8 0.2 pm in length with Bi catalysts located on both NW ends which demonstrated the SLS growth mechanism. The admixture of zinc blende and wurtzite structures were observed from TEM images. The diameter of the NWs can be tailored between 8 to 30 nm and the Co concentration can be tuned from 0 to 2.1% by varying the concentration of the reactants and reaction temperature. The temperature-dependent emission spectra of the Co-doped CdSe NWs were blue-shifted with increase of... 

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