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Assembling a Cake. Self Assembly e.g. of two-ended molecules in water Polar ends are attracted to water Molecules spontaneously organize themselves into.

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Presentation on theme: "Assembling a Cake. Self Assembly e.g. of two-ended molecules in water Polar ends are attracted to water Molecules spontaneously organize themselves into."— Presentation transcript:

1 Assembling a Cake

2 Self Assembly e.g. of two-ended molecules in water Polar ends are attracted to water Molecules spontaneously organize themselves into a pattern water

3 Example of Self-Assembly Balls could be organized into triangles by an external agent, a player Or: punch holes in desired pattern, roll a stream of balls over the board, and …Demo.

4 Self Assembly Shake

5 Application to Manufacturing RFID: Radio Frequency Identification Device e.g IDs in clothes automatically read by antenna as person walks out of store 100s of microns Successor to bar codes on supermarket items and nanotechnology

6 RFIDs are manufactured on silicon wafers, The wafer is diced and now you have a pile of small RFIDs. Expensive machines can separate them. Cheaper: self assembly using a fluid RFIDs, in a fluid flowing over a bed with holes in it, collect in the holes Voila! A regular, self-assembled array of RFIDs, each of which can be picked up and placed on the item to be identified (e.g. a dress) Fluidic Self Assembly (FSA) Video http://www.alientechnology.com/

7 Ideas for Activities Fluidic self assembly (FSA): Roll a stream of balls over a board with a rectangular array of holes drilled into it (as in the video). Board could be a peg board with two pieces of wood nailed to it to serve as walls defining a channel. A Chinese Checker board would also do well. Balls could be from a Chinese Checker game, or ball bearings. An advantage of drilling your own holes is that they could be drilled in a pattern, such as a students name, or a smiley face. http://www.alientechnology.com/technology/fsa_manufacturing.php Link to page with video:


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