From the bromination of 0.05g aniline, 0.156g of the product was collected. The percent yield was calculated to be 88.1%. Some amount of the product was lost when transferring the product from the Buchner funnel to the balance to measure its mass. To ensure the formation of the desired product, melting point of the product was measured to be 119.8-121.90c, which is in the range of the normal melting point of 2,4,6-tribromoanilne, 120-1220c. Thus, the product was indeed
The obtained DSC characteristic curves of the investigated samples are presented in Fig. 3a. The values of the glass transition temperature (Tg), the onset temperature of crystallization (Tc) and the peak temperature of crystallization (Tp) are determined and listed in Table 2. Very weak (Tg) endothermic changes are observed for all the samples except for the sample (Se60Te40)75Tl25. On the other hand, a sharp exothermic (Tc) peaks are easily observed for all the samples except for the sample (Se60Te40)60Tl40 in which a weak (Tc) peak is observed.
9. Theoretical yield = (150.22g/mol)(3.5 x 10^-3 mol of nucleophile) = 0.525 g Actual yield = 0.441 g, Percent Yield = (0.441g/0.525g) x 100% = 84% 10. Percent recovery from recrystallization = (0.172g/0.441g) x 100% = 38% 11. The data table provided below obtained melting point data for crude product, pure product, and mixture of the pure and 4-tert-butylbenzyl. 12.
The experimental data (Figure 5) shows indeed that the 2D band can be decomposed into four peaks (2L) and provides strong evidence in favor of multi-layer graphene as the major product. The ID/IG intensity ratio is widely used to assess the density of defects in graphite materials . The D band of No.5 sample is rather uniform and near the noise level, indicating the NG remains a high crystalline quality. It is noted that the ID/IG for all samples in this work is much larger than that of CVD-grown graphene . In addition, a weak disorder-induced feature at 1620 cm-1 can also be observed in Raman spectra of shock-synthesized samples.
Real deviation:-This deviation from the law occurs at high concentration of the absorbing species. The absorptivity ε of the solution changes with concentration depending on the refractive index η of the solution and since refractive index varies considerably at concentration higher than 10-3 M, absorptivity also varies. Beer-Lambert law is based on the assumption of an incident beam of monochromatic radiation and even the best monochromator system provides only polychromatic beam of radiation spread over a few wavelengths. 2. Chemical deviation: - This deviation occurs due to presence of more than one absorbing species in the sample.
Based on the Beer-Lambert Law, the absorbance of light of a sample is directly proportional to the concentration of the molecule which absorbs light. Distilled water is used as a blank solution to set the spectrometer to a zero reading due to none of the absorbing species present in the solution tested. In this experiment, heat is used to speed up the browning of reducing sugar to produce furan. It is due to the chemical reaction of the reducing sugar with the free amino group of an amino acid. The amino group that is present in monosaccharides sugar are a short chain, therefore it is more reactive.
It is also known as birefringent (the refractive indexes seen by horizontally and vertically polarised light are different). Slowing one of the linear components of the beam, oriented plate will convert linearly polarised light into circularly polarised light. A beam (left- or right-CPL) will produced . The basis of circular dichroism is the difference in the absorbance of left- and right-CPL. A molecule that absorbs LCP and RCP differently is considered as optically active or chiral molecule.
Table 24: Micromeritic characterization of OXB Sr. No. Parameters Result 1 Loose bulk density 0.28±0.03g/cm3 2 Tapped density 0.46±0.06g/cm3 3 Carr’s Index 37.44±0.03 % 4 Hausner’s ratio 1.59 5 Angle of Repose 26º 34’ From the above results it is evident that OXB exhibits poor flow properties. 8.1.2 Determination of solubility The solubility data for OXB as observed in 0.1 N HCl, pH 4.5 Acetate buffer, pH 6.8 Phosphate buffer and Purified water is presented in Table 25. OXB exhibited a pH independent solubility phenomenon in all pH conditions and various aqueous buffers. Table 25: Solubility data of OXB BCS solubility (pH solubility) profile of OXB Sr. No Media mg / ml 1 0.1 N HCl 249.119 2 pH 4.5 Acetate buffer 258.623 3 pH 6.8 Phosphate buffer 260.877 4 Purified water 253.200 *Average of three determinants 8.1.3 UV-VIS spectrophotometric method for OXB 126.96.36.199 Selection of
Sensitivity to the Magnetic Field variation Experiment:- These first experimental tests cover and explain the influence of the magnetic field flux density, which generated by the permanent Halbach magnet through its applied and removed gradually during the magnetization and demagnetization periods, respectively, within the regenerator and acts on the performance of the AMR. Whereby, the magnetic field that generate by NdFeB Hallbach magnet strays at its central bore, be proportioned to the distance outside, which the regenerator block is moved away from the center of the Halbach magnet, thus must have an influence on the performance of the regenerator. Therefore, the flux density along the central axis of the Halbach cylinder was measured, used a Hall probe of the Gaussmeter, and the results recorded. Since, the influence dimensions, length and internal radius, of