Typical Synthesis Procedures

In special cases, the template itself plays a role as a reactant for the shell formation. 

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A typical synthesis procedure is summarized by the following steps [29] ... 

A typical synthesis procedure involves the following steps (i) alumina is slurried in water, (ii) phosphoric acid is diluted in water, (iii) the phosphoric acid solution is added to the alumina slurry, (iv) the aluminophosphate precursor mixture is aged at ambient conditions, (v) an organic is added to the precursor mixture and aged with rapid agitation to form the final gel, which (vi) is charged into the autoclave and heated. The gel composition can be written as... 

The mesoporous silicoaluminophosphate materials were synthesized using cetyl tiimethyl ammonium bromide (CTAB) (99% S.D. Fine Chemicals) as structure directing agent. In a typical synthesis procedure, 8 gms. of aluminium isopropoxide (Loba Chemie) was mixed with dilute phosphoric acid (6.2 ml. H3PO4 in 60 ml H2O) and stirred vigorously for 1 hr at 333 K. This was followed by the addition of CTAB (8 gm in 20 ml H2O) with subsequent addition of appropriate amount of tetraethyl orthosilicate (TEOS) (Merck) in tetramethyl ammonium hydroxide. The pH of the resulting gel was around 2.5. The molar composition of the resulting gel thus obtained was ... 

Polymers included in this category are generally called polyborazylenes. Synthetic route to these polymers have been reviewed [8] thus, we provide an overview of typical synthesis procedures starting from borazine derivatives and leading to BN preceramic polymers. 

Several groups have conducted graft copolymerizations on starch or its purified components, amylose and amylopectin. The syntheses are based on attack of the anhydroglucose unit of starch by cerium (+4) ion. The free radical produced from this attack is then immersed in a monomer solution polymerizable by free radical, chain polymerization and a graft copolymer is formed. A typical synthesis procedure (10,16) is as follows. 

Coprecipifation is perceived as the most convenient approach to produce UCNPs with an ultrasmall size (sub-10 nm, Figure 5a and b) and narrow size distribution. In a typical synthesis procedure, lanthanide salt solutions are quickly injected into a fluoride solution under vigorous stirring, and NaLnF4 or LnF3 nanoparticles will be obtained... 

A typical synthesis procedure for mesoporous silica is given here to illustrate the key preparation steps. 

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