Báo cáo vật lý: "Synthesis, Characterisation and Catalytic Performance of Porous Nafion Resin/Silica Nanocomposites for Esterification of Lauric Acid and Methanol" potx

... Journal of Physical Science, Vol. 20(2), 23–36, 2009 23 Synthesis, Characterisation and Catalytic Performance of Porous Nafion Resin/Silica Nanocomposites for Esterification of Lauric Acid and ... (wt%) Catalytic Performance (%) Catalytic Performance (%) Synthesis, Characterisation and Catalytic Performance 34 Table 4: Influence of t...

Ngày tải lên: 07/08/2014, 14:20

... Figure 8: Imaginary part of impedance as a function of frequency for BiTaO 4 at various temperatures. Figure 8: Imaginary part of impedance as a function of frequency for BiTaO 4 at various ... to that of SbTaO 4 type and then transformed into triclinic phase at temperature above 870 o C. 10 The present study focused on the phase formation, thermal and electrical...

Ngày tải lên: 07/08/2014, 14:20

... antioxidant performance. These methods focus on different mechanisms of antioxidant including scavenging of oxygen and hydroxyl radicals, 5 reduction of lipid peroxyl radical, inhibition of lipid ... Therefore, it is assumed that benzalacetone and its derivatives will show antioxidant activity. Therefore, the objectives of this study are: (1) to synthesize and characteri...

Ngày tải lên: 07/08/2014, 14:20

... 157 o C) and 6 (mp 144 o C) were identified as isozaluzanin-C, telekin, and isotelekin. The IR bands [in chloroform (CHCl 3 )] of compound 3 were obtained at 3440, 1775, 1670, 1640 and 890 cm –1 and ... mp, IR and NMR of the authentic samples. Compound 9 showed IR bands at 1780 cm –1 due to the presence of δ-lactone, bands at 3540 cm –1 due to the hydroxyl group and...

Ngày tải lên: 07/08/2014, 14:20

... the study of the kinetics of polymerisation of the styrene core and butyl acrylate shell formation experimentally and estimates of the emulsion polymerisation mechanism of synthesis for the obtained ... conducted for 2 hours, and the second addition of APS was performed for the grafting process of butyl acrylate on the styrene core or butyl acrylate shell formation...

Ngày tải lên: 07/08/2014, 14:20

... wavelength of 500 and 600 nm. Hence, a balance of the CTE, T g , and the %T of the epoxy blends/SS could be selected based on their required performance for the LED application. Journal of Physical ... value. The T onset and T peak of the DCN were not influenced by the addition of diffusants. On the other hand, the ΔH and T g of the DCN decreased with the add...

Ngày tải lên: 07/08/2014, 14:20

... of the vinyl group of AA at 1636 and 1412 cm –1 , and the vinyl group of DVB at 1631 and 1400 cm –1 is due to those non polar double bond of vinyl that bound with non polar methine group of ... as the size of the particle smaller. The effect of BP particle size showed that the bigger of its size gave better bio-degradation properties. The use of DVB for the synt...

Ngày tải lên: 07/08/2014, 14:20

... important for the understanding of the physical nature of high temperature superconductors. Raman and far-infrared studies of these superconductors have contributed significantly to the understanding ... understanding of new class of superconductors. Thomsen et al. [13] studied the infrared and Raman spectra of the superconducting cuprate perovskites MBaCu 2 O 2 (M = N...

Ngày tải lên: 07/08/2014, 14:20

... fabrication costs and also affect the material stability and compatibility and the thermal degradation of the electrolyte itself. Therefore, there is a continuing effort to search for oxide ion ... conductivity values at 300 o C and 600 o C, and the E a values for all of the samples of Bi x NbO δ (2.5 ≤ x ≤ 6). The Arrhenius plot of YSZ is included for comparison...

Ngày tải lên: 07/08/2014, 14:20

... therefore promise great opportunity for application as catalysts and catalytic supports. 8 Because of the variety of practical uses, the fabrication of the desired morphologies of mesoporous ... with increasing amounts of HCl or the presence of large amounts of C1 – ions. Therefore, for the partial dehydration of PEO units, the volume of the hydrophilic part o...

Ngày tải lên: 07/08/2014, 14:20