Silicate particles

For both foam systems, the calculated distribution functions of the cell size from the SEM images are presented in Figure 9.20. The nanocomposite foams nicely obeyed a Gaussian distribution. In the case of PLA/ODA foamed at 150 °C under a high pressure of 24 MPa, we can see that the width of the distribution peaks, which indicates the dispersity for cell size, became narrow, accompanied by a finer dispersion of silicate particles. 

Figure 7. Layered silicate particles in a polymer and their effect on the E-modulus...

BSi, (2) blocking of reactive surfece sites on BSi through adsorption of inhibitors, such as trace metals like Al, (3) loss of reactive sites on BSi as a result of partial dissolution and reprecipitation, and (4) differential dissolution rates across a given siliceous particle due to shell geometry. 

MTO has been heterogenised inside the porous systems of hybrid silica matrices [59,60]. Thus, it has been supported on silica functionalised by polyethers [59]. These polyethers are covalently attached to a silicate particle using sol-gel procedures and act as the solvent for the catalyst (Scheme 14). 

Examples of the application of this method are given in Ref. 12. An extension of this method directly to fission products formed in situ in silicate particles is presented here. Also in this study an attempt was made to improve the geometrical match between the mathematical model and the actual silicate sample. 

Water wets quartz and other siliceous minerals more readily than does mineral oil. Consequently water tends to displace the oil films surrounding the quartz and other siliceous particles when the bituminous sand is mixed with water. Whether the oil is completely displaced depends on the properties of the water. That is to say, the materials dissolved or suspended in the water modify its wetting properties. 

Changes in particle surface structure by chemical modification provide increased selectivity in the interaction with certain biostructures and affinity to specific substances, cells or microorganisms, e.g. Proteus mirabilis (Figure 13). However, Silics particles affect the mobility of these microorganisms more... 

As-synthesized, calcined and steam-treated samples of FeZSM-5 grown from stirred and unstirred gels with Si02/Fe203-ratios 2 50, 90 and 200 were studied. The specimens consisted of uniformly thin (50-80 nm) sections of the iron silicate particles embedded in an acrylic resin and were prepared by ultramicrotomy, described in detail elsewhere (13, 14). 

In our studies, the model substance (montmorillonite) was a calcium bentonite (Istenmezeje, Hungary), the characteristic features of which are given here. X-ray diffraction (intensity of the basal reflection) and thermoanalytical (weight loss upon heating) data show 91% montmorillonite content. The other constituents are 5% calcite, 3% kaolinite, 1% x-ray amorphous silicates, and a trace of quartz. The amorphous phase is silicate particles, which are not crystalline for... 

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