Micellar templating

In previous sections, much emphasis has been put on block copolymer micelles with a spherical morphology. It was shown in Sect. 5 that the characteristic sizes of both the spherical core and corona of block copolymer micelles can be precisely adjusted by essentially controlling the chemical nature and the degree of polymerization of the constituent blocks. For several applications of block copolymers micelles including, e.g., micellar templating... 

The third breakthrough concerns the mesoporous compounds [13,14] with pore sizes in the 20-100 A range by using surfactant micellar templates. Very recently, the concept of microporous frameworks, which was primarily reserved to inorganic skeletons took a new dimension by the discovery of porous mixed inorganic-organic frameworks [15]. 

Mesoporous MSU-X silica was synthesized with a two-step pathway, that allowed us to get a high control degree on both the final material shape and the porous size distribution. These materials were developed and tested for separating applications, including HPLC chromatography and ultrafiltration membranes. Both applications show that the specific structure of the Micellar Templated Structures exhibits a new behavior in the separation applications, compared with other materials. They are explained by the combined effect of the silica nature and the specific cylindar pore shape. 

The above-discussed synthesis of reversed micellar templates is based on employing low-concentration emulsions, in which water forms a discrete phase while styrene and DVB form a continuous phase. Water droplets remain separated from each other and only form cavities on the outer surface of the disintegrated material. Only when the volume concentration of water is as high as 74% will its droplets start to be tangential to one another and lose their spherical form. Interestingly, the viscosity of such... 

P. Anilkumar and M. Jayakannan, Single-molecular-system-based selective micellar templates for polyaniline nanomaterials control of shape, size, solid state ordering, and expanded chain to coillike conformation. Macromolecules, 40, 7311-7319 (2007). 

PANI-DBSA nanoparticles Cond. 55 = 0.24 100 ppm 1 -100 ppm 1 ppm T50 — 15s - Micellar-templated chemical polymerization, inkjet printing, industrial detection [80]... 

Another approach to introduce mesoporous channels to give better access of reactant molecules to the microporous regions is to assemble zeolite nanoparticles around micellar templates, in a modification of the standard route to mesoporous silicas. Reported examples include structures that possess walls made out of nanocrystals of zeolites such as Beta or ZSM-5. These composite solids possess enhanced hydrothermal stabilities and acidities compared to mesoporous solids with fully amorphous walls. The improved properties are attributed to the presence of the zeolite fragments, because zeolites are known to have higher acidity and hydrothermal stability than amorphous silica/... 

Cam F, Colin A, Richard MF, Deleuze H, Seiler E, Birot M, et al. Inorganic monoliths hierarchically textured via concentrated direct emulsion and micellar templates. J Mater Chem 2004 14 1370-6. 

Example 13 Enzymatic Polymerization of Micellar-Templated PANI... 

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