Stamping stacking

In contrast to the flow-directed and Langmuir-Blodgett approaches described above, the printing approach used to deposit the NWs is a dry stamping approach analogous to that described in Chapter 13. Up to 10 addressable vertically stacked layers have been demonstrated. Each layer... 

Huskens et al. exploited host-guest interactions between dendritic guest molecules and CD-modified nanoparticles for the formation of organic/metal nanoparticle multilayers on a PDMS stamp (Fig. 13.15).88 The multilayer stacks were transferred to a complementary host surface, while no materials remained on the protruding areas of the PDMS stamp. These multilayers showed a well-defined thickness control of 2 nm per bilayer. 

Subsequently, Loo and workers demonstrated cold welding at ambient pressures [21], Specifically, they fabricated a metal-insulator-metal capacitor (Au-SiN -Au) by cold welding. An Au/SiNx/Au multilayer stack was deposited on a silicon stamp and directly printed on an Au-coated PDMS/PET substrate. The details of this device were discussed previously in Section 5.5.4. 

Of considerably less commercial importance than the random or dumped packings are the oriented grids, meshes, wires, or coils. These range from inexpensive open-lattice metal stampings that stack 45° or 90° to each other and... 

Figure 2. Stamped sheet metal repeating unit of the Julich G-design light-weight stack. Interconnect, cell and frame are welded into single units that are then joined into a stack by a...

Our team charter had defined our boundaries, so we started with a flat sheet metal part that has already been stamped from coil stock at a preceding operation. The team s first stop was a machine that bent up all four edges of the blank sheet metal to form a pan. What the team observed was that the parts were brought to this machine in a container that required the operator to bend over to retrieve the vertically stacked parts. The operator also had to pry apart the sheet metal pieces with his fingertips before he lifted them from the container. The oil that had accumulated on the parts from the previous stamping operation caused the parts to stick together. The... 

The anode and cooling fins (in the case of an air-cooled device) begin as flat sheets of copper. They are stamped by the tube manufacturer into the necessary sizes and shapes. After all of the parts have been machined, the anode and cooling fins are stacked in their proper positions, clamped, and brazed into one piece in a brazing furnace. 

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