Investigation of the acid properties

Fig. 1.2.6. Results of potentiometric investigation of the acidic properties of Mo03 in the molten KCl-NaCl eutectic at 700 °C (a) potentiometric curves 1, 0.080 mol kg-1 Mo03 + O2- (F, the dependence of n against the initial molality of the titrant) 2, 0.084 mol kg-1 Mo03 + CO (b) fractions of MoVI oxoacids in the solutions at different...

There are many studies on the geometry of Si atoms in framework of AlPO-n, partly because of the ease with which the environment of the Si atoms can be explored with MAS However, the investigation of the acid properties of MeAlPO-n... 

The investigation of the acidic properties of zeolites started with ammonium ion-exchanged Y-zeolites (NH4Y). Ammonium ion-exchanged Y-zeolite evolves ammonia and water by heat-treatment at 650 — 600 K, and 770 — 820 K, respectively. The transformation of NH4Y can be schematically expressed as follows. 

In order to identify tyrosine derivatives that would lead to polymers that are processible, mechanically strong, and also biocompatible, we initiated a detailed investigation of the structure-property relationships in polyiminocarbonates and polycarbonates. Since the amino and carboxylic acid groups of tyrosine dipeptide (the N and C termini) provide convenient attachment points, selected pendent chains can be used to modify the overall properties of the polymers. This is an important structural feature of tyrosine dipcptide derived polymers. 

Industrial applications of zeolites cover a broad range of technological processes from oil upgrading, via petrochemical transformations up to synthesis of fine chemicals [1,2]. These processes clearly benefit from zeolite well-defined microporous structures providing a possibility of reaction control via shape selectivity [3,4] and acidity [5]. Catalytic reactions, namely transformations of aromatic hydrocarbons via alkylation, isomerization, disproportionation and transalkylation [2], are not only of industrial importance but can also be used to assess the structural features of zeolites [6] especially when combined with the investigation of their acidic properties [7]. A high diversity of zeolitic structures provides us with the opportunity to correlate the acidity, activity and selectivity of different structural types of zeolites. 

Another source of error in the investigation of the surface properties of titanium dioxide is its tendency to adsorb acids or ions. Phosphate ions are very strongly adsorbed (see Table XIX) as well as sulfuric acid. Commercial pigments often have considerable sulfate contents. When titania is precipitated from sulfate solution, sulfate ions are strongly adsorbed (308). They are carried through all further stages of pigment manufacture. 

The synthesis and ion-exchange properties of ceric tungstate have been investigated.521 The acidic properties of WOa in a KCl-NaCl melt have been studied.522" and the reduction characteristics of Mo042- in fused LiCl-KCl reported.5226... 

Further investigations of the physical properties of hyaluronic acid are clearly necessary. The method of extraction is important and procedures which do not involve degradation should be used. There is the possibility also that protein in the polysaccharide-complex may cause purely physical aggregation and correspondingly high molecular weights. 

Until the fabrication of the first conductive LB film by Ruaudel-Teixier et al. [20], LB films had been considered as insulators or at most as semiconductors with very low conductivities. This is understandable since the typical film-forming molecules are long-chain fatty acids, which can act only as insulators. It is no wonder that the first systematic investigations of the electrical properties of LB films were carried out for insulating LB films [21-30]. Mott s variable-range-hopping model [31] is employed to explain the results [21,24]. 

Fillers have been studied for their effect on the rheological properties of aminoplasts. Investigations of the rheological properties of aminoplasts filled with cellulose diacetate (CDA) wastes and into the effect of minor quantities of plasticizers on the viscosity of compositions have been carried out [12]. With a CDA content increase from 40 to 60% the viscosity of the composition declines. With the introduction into the aminoplasts of a lubricant (stearic acid) containing 50% CDA the viscosity of the compositions also declines. The same is observed when introducing 1-2% of plasticizer (unsaturated PEF). 

TeTy few investigations of the ligand properties of phosphorous acid diesters OP(H)(OR)2 have been reported, as shown in Table I. Molecules of this type are potentially interesting in that several coordination... 

The main part of the side group in these macromolecules consists of the alkoxy-benzoic acid moiety. This acid may form thermotropic liquid crystals. The investigation of the hydrodynamic properties of PPhEAA molecules in dilute solutions has revealed that the equilibrium rigidity of their main chains is relatively low (Table 12). Hence, since for all flexible-chain polymers, the shear optical coefficient An/Ar in PPhEAA solutions is independent of molecular weight the segmental anisotropy - tt2 and the anisotropy of the monomer unit Aa may be determined by use ofEq. (67). 

Riddle FL, Fowkes FM. Special shifts in acid-base chemistry. 1. Van der Waals contributions to acceptor numbers. J Am Chem Soc 1990 112 3260-3264. Papirer E, Brendle E, Balard H, Vergelati C. Inverse gas chromatography investigation of the surface properties of cellulose. J Adhesion Sci Technol 2000 14 321-337. 

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