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:
Assembling a Cake
Self Assembly e.g. of two-ended molecules in water Polar ends are attracted to water Molecules spontaneously organize themselves into a pattern water
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.
Self Assembly Shake
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
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
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. Link to page with video: