Experimental details sample preparation

Refer to Experiment [2] for specific experimental details on preparative GC applied to the separation of a number of binary (two-component) mixtures. These are designed as practice examples to give you experience with sample collection. 

Give brief experimental details to indicate how you could prepare in the laboratory a sample of either tin(IV) chloride or tin(IV) iodide. How far does the chemistry of the oxides and chlorides of carbon support the statement that the head element of a group in the Periodic Table is not typical of that group (JMB, A)... 

The AOS and IOS surfactants discussed in this section are laboratory-prepared samples. The experiments were carried out by Borchardt [40] who used the spinning drop method throughout. Experimental details are given in the footnotes of the tables that follow. 

Experimental difficulties include sample preparation, intensity and stability of X-ray beam, and resolution. Insufficient resolution in even the best spectra presently attainable obscures some details of the fine structure. The spectra reported here are obtained with resolution of 1 or 2 ev. the present limit to resolution in the energy range explored here is about 0.5 ev. 

Methods. Polyblend samples were prepared by solution casting from tetrahydrofuran (THF), or chloroform or by injection molding using a Mini-Max Molder by Custom Scientific Instruments. Specific experimental details are given elsewhere (9,10,11). 

How can we experimentally determine which is the outer and which the inner phase One possibility is to use electron microscopy which provides detailed images of the emulsion structure. Electron microscopes are relatively expensive and sample preparation requires time and skill. Therefore alternative techniques are often used ... 

Nd-Pt-Sb. NdPtSb crystallizes with the Caln2 type structure, a = 0.4544, c = 0.7878 (Rossi et al., 1981 powder X-ray diffraction data). For the experimental details, see the LaPtSb. At variance with these data, Wenski and Mewis (1986a) reported the LiGaGe type structure for the NdPtSb compound, a = 0.4535, c = 0.7866 from X-ray single crystal investigation. For the sample preparation, see PrPtSb. 

An early investigation of the HoNiSb (3) compound showed that it had the MgAgAs-type with a = 0.6290 (Dwight, 1974) from an X-ray powder analysis. For the sample preparation, see ScNiSb. Pecharsky et al. (1983a) and Hartjes and Jeitschko (1995) confirmed the crystal structure and obtained the same lattice parameter of a = 0.6262 by X-ray powder diffraction. For experimental details, see ScNiSb and LaNiSb, respectively. 

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