Synthetic assemblies

K. Matsuoka, M. Terabatake, Y. Esumi, D. Terunuma, and H. Kuzuhara, Synthetic assembly of trisaccharide moieties of globotriaosyl ceramide using carbosilane dendrimers as cores. A new type of functional glyco-material, Tetrahedron Lett., 40 (1999) 7839-7842. 

Of course, the above suggestion ignores the problem of possible supramolecular functionality. Whereas the natural systems are invariably characterised by high functionality in terms of their biochemical roles, in contrast, the functionality of the majority of synthetic assemblies so far investigated has very often been either minimal or, indeed, absent altogether. The incorporation of designed functionality into supramolecular systems will thus undoubtedly continue to attract increased attention in future studies. 

Ditrbutbns of everpihg. The latter comment on distributions of x values brings us to our next topic, the fact that most samples containing nanoparticles contain many different nanoparticles, with entire distributions of particle sizes and shapes, particle compositions and structures, matrix media, etc. Natural and synthetic assemblies of nanoparticles are complex, mainly because there are correlated distributions of all the physico-chemical properties of the nanoparticles themselves, not to mention the supporting medium or matrix. As a result, most measured properties cannot be understood on the basis of the properties of individual nanoparticles alone. For example. Equation (2) leads to a predicted exponential time dependence of the sample magnetization, at constant temperature and applied field, of the form... 

Several other structural studies on multichromophore complexes have been reported, either solved by X-ray diffraction or determined by electron diffraction on two-dimensional crystals. "- Clearly, most of the systems are closely related to photo.synthesis. This trend is valid for purely synthetic assemblies whose design and elaboration are mostly guided by natural photosynthesis. 

Composites are combined materials created by the synthetic assembly of two or more components - a selected reinforcing agent and a compatible matrix binder - in order to obtain specific and advanced characteristics and properties. The components of composite do not dissolve or otherwise merge completely into each other, but nevertheless do act in concert. The components as well as the interface between them can usually be physically identified, and it is the behavior and properties of the interface that generally control the properties of the composite. The properties of a composite cannot be achieved by any of the components acting alone. 

Composite. A homogeneous material created by the synthetic assembly of two or more materials (a selected filler or reinforcing elements and compatible matrix binder) to obtain specific characteristics and properties. Composites are subdivided into classes on the basis of the form of the structural constituents Laminar — Composed of layer or laminar constituents Particulate—the dispersed phase consists of small particles Fibrous—the dispersed phase consists of fibers and Flake—the dispersed phase consists of flat flakes. 

The case of interfacial polymerization of PAN is likely the best known, and the first demonstrated. As in other kinds of synthetic/assembly and... 

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