Atomic force microscopy molecular assemblies

Some of the more remarkable examples of this form of topologically controlled radical polymerization were reported by Percec et cii.231 234 Dendron maeromonomers were observed to self-assemble at a concentration above 0.20 mol/L in benzene to form spherical micellar aggregates where the polymerizable double bonds are concentrated inside. The polymerization of the aggregates initiated by AIBN showed some living characteristics. Diversities were narrow and molecular weights were dictated by the size of the aggregate. The shape of the resultant macroniolecules, as observed by atomic force microscopy (ATM), was found to depend on Xn. With A, <20, the polymer remained spherical. On the other hand, with X>20, the polymer became cylindrical.231,232... 

Wold DV, Haag R, Rampi MA, Frisbie CD (2002) Distance dependence of electron tunneling through self-assembled monolayers measured by conducting probe atomic force microscopy unsaturated versus saturated molecular junctions. J Phys Chem B 106 2813-2816... 

Pursch, M., Vanderhart, D.L., Sander, L.C., Gu, X., Nguyen, T., and Wise, S.A., C30 self-assembled monolayers on sihca, titania and zirconia HPLC performance, atomic force microscopy and NMR studies of molecular dynamics and uniformity of coverage, J. Am. Chem. Soc., 6997, 2000. 

In this chapter, we focus on molecular assemblies of functionalized molecules consisting of phthalocyanines (Pcs) and porphyrins noncovalently bounded on metal surfaces, in order to explore their potential as building blocks for the construction of nanostructures, by using scanning probe microscopy (SPM) including STM and atomic force microscopy (AFM). 

The concept of templated self-assembly of quantum dots has been transferred from molecular beam epitaxy to chemical vapour deposition. Here we demonstrate the fabrication of ordered arrays of Ge islands on a Si (100) surface using optical holography for the prepattern and subsequent growth by chemical vapor deposition. The samples were analyzed by atomic force microscopy and photoluminescence. Ordered arrays of Ge islands with a narrow size distribution and intense narrow photoluminescence lines of the islands have been observed. 

Cations bind to nanoscopic colloidal assemblies, supra-molecular solid lipid nanoparticles of amphiphilic calix[4]arene derivatives, leading, in certain cases, to the clustering of such assemblies in the presence of divalent cations Mg and Ca . Such clustering was imaged by atomic force microscopy. Such effects have particular relevance to the use of such transport systems in physiological media. 

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