Carrier film

Fig. 8. Schematic of methods for MLC manufacturing (a) belt casting (b) carrier film casting using a doctor blade.

The use of carrier films is thus an effective way to enable the transfer printing of assemblages of nanoscale materials elements. In addition to SWNTs, this carrier film approach may aid in the transfer of arrays of small inorganic nanoparticles or perhaps even small molecules that for whatever reason must be synthesized or processed on the surface of a substrate that is not suitable for the end-use application. 

D. Wang, A. Zutshi, T, Bibby, T. S. Cale, S. P. Beaudoin, Effects of carrier film physical properties on W CMP, Submitted for publication in Thin Solid Films. 

Carrier, film, matrix Carrier, film, matrix Controlled release Safety for administration Safety for administration Localization, transit rate control Enhancement of transport... 

Electrophoretic separation of dendrimers is usually performed with polyacrylamide gel applied to glass plates of carrier films (flat bed, slab gel electrophor-... 

Apart from direct metallization of substrates as described above, transfer metallization is also possible. In this technology the metal layer is deposited on to a carrier film on which the metal adheres only very weakly, or which is coated in such a way that it is subsequently separable. The metallized side of the film is then laminated... 

There are variations on the above approach. For instance, the hopper may move over a stationary carrier film. It is also possible to draw a polymer ribbon through a slip so as to pick up thin layers on both surfaces. 

Metal fillers for high-temperature adhesives must be carefully selected because of their possible effect on oxidation, as indicated in the previous section. Carrier films, such as glass cloth, are generally used to facilitate the application of the adhesive, but they also provide a degree of reinforcement and lowering of the coefficient of thermal expansion. Thus, they reduce the degree of internal stress experienced at the joint s interface. 

The choice of polymers suitable for forming the carrier film matrix and the barrier film are dictated by several factors, including ... 

Several polymers were found to fit all or most of the above criteria and were used to prepare the carrier films. Many polymers have been used for this purpose, viz., ethyl cellulose, poly(y-benzyl glutamate), poly(vinyl acetate), cellulose acetate phthalate, and the copolymer of methyl vinyl ether with maleic anhydride. In addition to the base polymers, plasticizers were often needed to impart a suitable degree of flexibility. Plasticizers, which are found to be compatible with polymeric materials include, acetylated monoglycerides, esters of phthalic acid such as dibutyl tartarate, etc. An excipient was usually incorporated into the matrix of the carrier films. The excipients used were water-soluble materials, which are capable of creating channels in the polymer matrix and facilitate diffusion of the drug. PEGs of different molecular weights were used for this purpose. 

Generally, the barrier or rate-controlling films are more permeable to water than the carrier films. The materials used for this purpose consisted of a base, film forming water-soluble polymer in combination with at least one hydrophilic component such as hydroxypropyl methylcellulose or polyvinylpyrrolidone. The polymers used were the same as those for the carrier films. Some recent developments are discussed herein. 

Fig. 6 Schematic of a tape casting process used to form thin sheets of ceramic material. The slurry of ceramic particles and carrier fluid flows beneath the doctor blade onto a moving carrier film. As the tape moves down the bed, it dries and is then spooled on a take up reel.

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