Silica morphology

The average diameter of the silica particles is close to 10 nm. Similar silica morphology has also been reported by Kohjiya et al. [30]. When the TEOS concentration is increased to 30 wt% with respect to ACM, the same silica particles grow much bigger in size, displaying an average diameter of 70 nm, as illustrated in Eigure 3.3b [32]. 

INFLUENCE OF SILICA MORPHOLOGY ON THE PROPERTIES OF OCTAOECYLOIMETHYLSILOXANE BONDED PHASES... 

It is obvious from Equation (6) that the processes are accompanied by sodium chloride produdion. The salt content reaches a significant amount that sometimes poses a problem. The NaCl is withdrawn by dialysis that makes the silica fabrication inconvenient owing to this additional time consuming procedure. As a further disadvantage of sodium metasilicate, it is believed to be not very flexible in regulation of the silica morphology [61]. 

Patwardhan, S.V., Mukherjee, N. and Clarson, S.J. (2001) The use of poly-L-lysine to form novel silica morphologies and the role of polypeptides in biosilicification. Journal of Inorganic and Organometcdlic Polymers, 11, 193-198. 

Kroger, N. Deutzmann, R. Bergsdorf, C. Sumper, M., Species-specific polyamines from diatoms control silica morphology. Proc. Natl. Acad. Sci. USA 2000, 97, (26), 14133-14138. 

Morphology, effect on diffusion Morphology, mesoporous silica Morphology, MFl Morphology, MFI, internal Mossbauer spectroscopy MPV (Meerwein-Ponndorf-Verley) reduction... 

Satisfactory results were obtained with the nitrogen CMitaining monomers DMABMA and NVP. The poly-DMAEMA (Ilia) and poly-NVP (Illb) silicas with more than 30 weight percent polymer ccxiserve the silica morphology and were easy to separate from the mcnomer excess. 

Patwardhan, S. V Mukherjee, N. Clarson, S. J., The Use of Poly-L-Lysine to Form Novel Silica Morphologies and the Role of Polypeptides in Biosilicifica-tion. J. Inorg. Organomet. Polym. 2001,11,193-198. 

Various linear synthetic analogs of the natural active polyamines in biosilica formation on the basis of linear poly(ethylene imine) or polyfpropylene imine) were recently synthesized and reported to accelerate the silk acid condensation even more than the above-mentioned silaffins [226]. This imphes that it is not the silaffin protein superstructure that is responsible for its catalytic activity,as is the case for example in enzymes. In addition, poly(L-lysine) also led to modified silica morphologies such as fibers or ladders [227]. 

Fig. 15 Polymer silica morphology under low and high strain in (a) less polar matrices and (b) more polar matrices (Based on [18])...

Park HB, Lee SY, Lee YM (2005) Pyrolytic carbon membranes containing silica Morphological approach on gas transport behavior. J Mol Struct 739 (1-3) 179-190... 

Table 1.1 Silica morphology for each copolypeptide at different synthesis conditions.

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