Sacrificial molds

Last, weak guest—host interactions, such as those between adamantane and P-cyclodextrin (Rodell et al., 2013), are also reversible by exposure to shear stresses. They can be used to create bioinks that are a gel while in the cartridge, but they are fluid when extruded through a needle before returning to their gel state upon deposition onto a substrate. Polymers that exhibit reversible gelation behavior are mostly used in printing applications as transient structures such as sacrificial molds (Muller et al.,... 

We chose to use a sacrificial template method to make our nanorods. This method uses a membrane with nano/microscopic sized channels as a mold for the design of a nanowire, fiber, or rod, depending upon the intended use for the object and the materials comprising it. ... 

The mandrel (mold) on which filament-wound products are produced is essentially light, but solid, in construction and (usually) near cylindrical. The most common product is pipe, when the mandrel can be made simply of aluminum sheet on a lightweight framework. RP can also be used. An important aspect of the mandrel is that it must be possible to extract it easily from the wound lay up, after curing. This may mean use of a tapered or collapsible mandrel (Figure 5.77), or even a sacrificial mandrel (made possibly of plaster) which is broken up inside the cured product. 

By using photoresist as a sacrificial layer or structure, further processes, etching, ion implantation, molding, lift-off, and so on, may be performed. When patterned photoresist finish its roles, it is better to be removed from substrate. There are two kinds of methods to remove photoresist layer, wet type and dry type. Wet type photoresist removal process requires the chemical, PR remover or PR stripper, which can dissolve photoresist. Alternatively, plasma ashing process may remove photoresist This process is called dry process and uses oxygen plasma which oxidizes photoresist layer. 

Golden, A. P. and Tien, J. 2007. Fabrication of microfluidic hydrogels using molded gelatin as a sacrificial element. Lab Chip, 7,720-5. 

---