Subject core shell

Construction of organic nanotubes starting from porphyrin dendrimers with core/shell architecture is also feasible. Figure 8.29 also shows how covalent nanotubes can be produced by removal of the dendritic component of the molecule. A coordination polymer is first synthesised from a dendritic metallopor-phyrin with alkene end groups. This is subjected to intramolecular and intermo-lecular crosslinking by ring-closing metathesis at the periphery. 

Synthesis forms a vital aspect of the science of nanomaterials. In this context, chemical methods have proved to be more effective and versatile than physical methods and have therefore, been employed widely to synthesize a variety of nanomaterials, including zero-dimensional nanocrystals, one-dimensional nanowircs and nanotubes as well as two-dimensional nanofilms and nanowalls. Chemical synthesis of inorganic nanomaterials has been pursued vigorously in the last few years and in this article we provide a perspective on the present status of the subject. The article includes a discussion of nanocrystals and nanowires of metals, oxides, chalcogenides and pnictides. In addition, inorganic nanotubes and nanowalls have been reviewed. Some aspects of core-shell particles, oriented attachment and the use of liquid-liquid interfaces are also presented. 

The second alternative for polymerizable surfactants is polymeric surfactants. The subject has been recently reviewed by Lachewsky [8]. Even more recently the same authors [135] compared polymerizable surfactant and their homopolymers (polysoaps) and showed that good results can be obtained from them. The same conclusion has been shown valid for the homopolymer of one of the first commercially available allylic surfmers [136]. Recently, core-shell particles have been prepared using an inisurfmer, containing both a polymerizable moiety and a peroxydic group. This compound has been used to cover a seed polymer particle and initiate, from the peroxide group, the polymerization of a shell of another polymer [137]. 

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