Effect of preparation methods

We now return to our phosphor example, BaSi20s Pb. Tliere are at least three (3) methods we can employ in the general preparation of phosphors, these are  

We have already discussed 1. To coprecipitate a raw material, we would use Na2Si03 as a solution in water along with the proper combination of BaCl2 and PbCl2 in solution. We then precipitate at 100 °C. so as to obtain a crystalline product, adding the silieate solution to the cation solution. The precipitate is filtered, and the NaCl removed by washing. We then must add 1.00 mol of Si02 to the raw material and then fire the mixture. 

Note that we are not addressing the cases where we use raw materials to prepare the phosphor, but of copreeipitated material containing both the cation and the activator. An example of a raw material used to prepare a phosphor would be SrHP04 whieh reacts  

But here we would have to add SnO to the SrHP04, before firing, to obtain the phosphor, Sr2P207 Sn. In this case, we find that it is very difficult to 

There are a few phosphors which can be directly formed by precipitation from solution. One such is YVO4 Eu. The chemistry is complex, since one 

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B. Effects of Preparation Methods on Serum Lipids 1. Boiled vs Paper-Filtered Preparation Methods... 

Lyon DY, Adams LK, Falkner JC, Alvarez PJJ (2006) Antibacterial activity of fullerene water suspensions Effects of preparation method and particle size. Environ. Sci. Technol. 40 4360 1366. 

The effect of preparation methods, impact of cations and interaction between combinations of gel types were studied. The use of rotaiy shadowing, while minimal in this study, was used... 

Wang, J. and Feng, Y.J. (2005) Effect of preparation method on electrocatalysis of rare earth Gd doping Sn02/Sb electrode. J. Jilin University (Science Edition). 43(4), 546-550 (in Chinese). 

Dimitratos, N., Villa, A., Bianchi, C. L., Prati, L. and Makkee, M. (2006). Gold on titania Effect of preparation method in the liquid phase oxidation. Appl. Catal. A-Gen. 311, 185-192. 

Zhang, L., Wang, X., Tan, B., and Ozkan, U.S. Effect of preparation method on structural characteristics and propane steam reforming performance of Ni-Al203 catalysts. Journal of Molecular Catalysis A Chemical, 2009, 297 (1), 26. 

Fig. 1. Effect of preparation method of iiposomes (DC-Choi/DOPE) on their size. ML and DL were prepared by the MEi and dry-fiim method, respectiveiy. The size of the iiposome was measured in water. Each resuit represents the mean SD n=3)...

Figure 2. Effect of Preparation Method Thermodesorption of H2 over APC (support A-64).

Organic Collective effects of preparation method of conducting polymers, polymer morphology, properties of the substrate/film interface 24... 

Puxley, D.C. Kitchener, I.J. Komodromos, C. Parkyns, N.D. The effect of preparation method upon the structure, stability and metal/support... 

Catalytic runs for testing the effect of preparation method on catalytic behavior were performed at 573 K with 4% of methanol (in air) in reactor feed. Results (figure 5) show that among tested catalysts, including an industrial catalyst, the more active and selective was the sol-gel catalyst. Comparing the behavior of this catalyst with the industrial catalyst, at several temperatures (figure 6) it is noteworthy that the sol-gel catalyst performs better than industrial catalyst, even at temperatures 50K lower. 

Effect of Preparation Methods of Titania/silicas on their Catalytic Activities in the Oxidation of Olefins... 

Titania/silica catalysts were prepared by a conventional procedure (precipitation) and a complexing-agent assisted sol-gel method. The effect of preparation methods of titania/silica catalysts on their properties and catalytic activities in the oxidation of olefins were examined. The sol-gel method gave the best dispersion of titania. In contrast, using the precipitation method, titania is deposited at the external surface of silica with formation of crystalline particles. The sol-gel catalysts are more effective for epoxidation of olefins because of the high dispersion of Ti in them. 

Figure 4 Effect of preparation method on the reactivity of titania/silica catalysts in the epoxidation of cyclooctene with tert-butyl hydroperoxide in tert-butanol...

Other methodological problems result from sampling and sample preparation, particularly with respect to the solid phase (Chapter 3.2). The effect of preparation methods on experimental determinations of KD-factors of radionuclides between aqueous phases and aquatic sediments has been reviewed by Duursma (1984). There are significant effects of the drying procedures. The influence of grain size on the distribution coefficient can be enormous, as demonstrated by the data in Table 4-3 ... 

EFFECT OF PREPARATION METHOD AND THE NATURE OF SULFATED MIXED OXIDE CATALYSTS ON THE ACID STRENGTH DISTRIBUTION... 

Basic salt solutions formed in situ during catalyst activation (7) or formed just before or during impregnation (8) have also been reported, but with only minimal evidence of effect of preparation method on catalyst stmcture or performance. 

Mesoporous solid base catalyst was prepared by loading KI, K2CO3 and KOH on mesoporous active carbon and was used to catalyze dimethyl carbonate synthesis from propylene carbonate and methanol. The effect of preparation method, base strength, catalyst content, reaction time and ten erature were investigated. 

Supported C03O4-CeO2 monoliths effect of preparation method and Pd-Pt promotion on the CO/CH4 oxidation activity... 

Supported vanadium oxide nanoparticles effect of preparation method, support and type of precursor on the catalytic performances in the ODH of methanol to formaldehyde... 

Supported vanadium oxide nanoparticles effect of preparation method.. 

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