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What factors affect the instrumentation?s differential thermal analysis Business Articles | October 8, 2012 The differential thermal analysis of the operation of the instrument is quite simple, however, the results obtained in the actual operation on different instruments is different Cheap Nike Air Max Deluxe Mens , in some aspects will have some changes.
These changes are caused by a certain factor, and the factors are also different types. However, as long as strict control over the use of certain conditions, the reproducibility will be rather optimistic.
The heating rate is not only affects the position of the peak temperature, but also affects the size of the peak area, in general, the peak area is larger in a faster heating rate Cheap Nike Air Max Deluxe Womens , the peak becomes sharp. But the fast heating rates make the sample decomposition degree of deviation from the equilibrium conditions larger, so easy to make baseline drift. Mainly may cause the two adjacent peaks overlap, the resolution is decreased. Slow heating rate, the baseline drift is small, so that the system approaches equilibrium conditions, to obtain a wide and shallow peak, and also enables a better separation of the two adjacent peaks Cheap Nike Air Max Deluxe Black , and thus the high resolution. But the determination is long, and need the high sensitivity of the instrument.
The equilibrium temperature of the atmosphere and pressure can affect the the sample chemical reactions and physical changes, the peak shape. Appropriate atmosphere and the pressure must be selected according to the nature of the sample, in some samples is easily oxidized, and can pass into the inert gas such as N2, Ne.
To obtain a stable baseline, the choice of the reference material is very important. The reference material does not undergo any change in the heating or cooling process Cheap Nike Air Max Deluxe White , the specific heat of the reference compound in the entire heating process, the thermal conductivity, the particle size is consistent with or similar with the sample as much as possible.
Commonly used ±-aluminum oxide Al2O3 or calcined magnesia (MgO) or quartz sand as the reference substance. Such as the analytical sample is a metal, can also be used a metallic nickel powder as reference substance. If the thermal properties of the sample and the reference compound are very far, you can use diluted sample method to solve, mainly to reduce the intensity of the reaction; sample heating process gas can reduce the large number of gas, so as not to test kind of rushed out. Selection of a diluent and the sample can not have any chemical reaction or catalytic reaction Cheap Nike Air Max Deluxe Triple White , common diluents SiC, iron powder, Fe2O3, glass beads Al2O etc.
Therefore, we should according to the different samples to select the appropriate paper speed. The different conditions of selection will affect the differential thermal curve, the addition to the above, there are many factors Cheap Nike Air Max Deluxe Triple Black , such as a sample tube, the material, size and shape of the thermocouple material and a thermocouple inserted in the sample and reference material, position, etc.
As the surveys by metal powder supplier, big dosage of sample easy to make two adjacent peaks overlap, reducing the resolution. General as much as possible to reduce the amount of up to mg. The particle size of the sample in the 100 mesh to about 200 mesh Cheap Nike Air Max Deluxe Retro , small particles can be improved thermal conditions, but too thin may disrupt the degree of crystallinity of the sample. The decomposition of the gas samples, the particles should be larger. Reference substance particles, loading conditions and the tightness should be consistent with the sample, and to reduce the drift of the baseline. The commercial differential thermal analyzer have been fixed the above factors, but their differential thermal analyzer assembly should consider these factors.
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