Embedded components Fabrication

The key to self-assembly is the components that are involved the information required for efficient self-assembly must, in general, be embedded in these components. The first step toward the capability to design and synthesize nanostructures for self-assembly is simply to expand the range of syntheses and methods of fabrication that lead to nanostructures. For the... 

In another approach, filaments containing two polymers that do not adhere to each other are spun and then split. One may, for example, spin a bicomponent fiber of nylon that has several filaments of polyester embedded. After a fabric containing bicomponent filaments has been woven, it is treated to split the components, thus converting the original filament to several smaller filaments. Deniers of the order of 0.1 can be achieved by this ingenious method. In the last method, instead of... 

Literature continues to be rather extensive on this subject since the 1930s. A summarization is provided in this section. Products fabricated include sheets, films, rods and tubes, and embedment. Acrylic castings usually consist of polymethyl methacrylate (PMMA) or copolymers of this ester as the major component with small amounts of other monomers to modify the properties (Chapter 2). Adding acrylates or higher methacrylates lowers the heat deflection temperature and hardness and improves thermoformability and solvent cementing capability, with some loss in resistance to weathering. Dimethacrylates or other crosslinking monomers increase the resistance to solvents and moisture. 

On the other hand, a multicolour luminescent image, on the basis of a single phosphor embedded in mesopores or macrocavities of anodic alumina films, can be fabricated using blue PL that is specific for some films. Examples of such blue PL recorded for three types of electrolyte, are presented in Fig. 3. The origin of the blue PL from PAA is considered to be related to generation F-centres during anodizing of aluminium or excitation of residual chemical components absorbed from the electrolytes [8,9]. 

Composite materials that take advantage of the strength, stability, and low density of carbon fibers are widely used. Composites are combinations of two or more materials. These materials are present as separate phases and are combined to form structures that take advantage of certain desirable properties of each component. In carbon composites the graphite fibers are often woven into a fabric that is embedded in a matrix that binds them into a soUd structure. The... 

Wetted fibers on-chip have only recently been attempted and show great promise. Like embedded fibers, the wetted fibers require very sophisticated microfabrication techniques. Microfluidics has seen the rapid development of new methods of fabrication and of components such as microchannels that serve as pipes and other structures that form valves, mixers, and pumps that are essential elements of microchemical factories on a chip. Wetted fibers will require easier ways of inserting and removing the fibers from the chip as well as simpler methods of preparing the fiber tips with biomolecules for detection. 

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