June 25, 2011

Integrating Molecular Switches and Machines with the Everyday World by Fraser Stoddard

"Integrating Molecular Switches and Machines with the Everyday World"
Sir Fraser Stoddart, PhD, Head of Northwestern's Mechanostereochemistry Group

875 papers and publications

Briefly reviewed his work

1981 to 1998 to make a molecular switch

Spread the switch onto monolayer

Works with Jim Heath to work on crossbars

electrochemical switching of the bistable catenane (2000)




rotaxane based switch

molecular switch tunnel junction. 70nm wires and 100 nm wires
5000 molecules per junction

160 kbit molecular RAM (2007)
2500 junctions out of 160000
device is smaller than the cross section of a white blood cells
75% of the switches were bad.

10^11 bits per square centimeter.

Switches are not robust, need to put them into polymers

Bottom up – Stoddart, top down Heath

2007 160 kbit molecular device

where to go
Omar Yaghi

Beyond open reticulated geometries
Catananes and rotaxanes inside metal organic frameworks

Molecule is the crystal
Ultra high porous (a lot of space in them)

Mechanically interlocked molecules

A crown ether in a MOF

Paraquat in BORG 1

A catanane in a 2D

A MOF replete with otdered catananes
Towards 3D molecular structures

Need to add switchability to a robust MIMS with MOF structures



making of nanovalves (video) to try and develop a way to treat cancer

Simple ways to make complex molecules

Efficient and creative templated organic synthesis rapid and reliable physical measurements

Nanotech spawns new approaches to energy, nanoelectronics and photonics,
Next generation beyond cmos,
Nanomaterials and composites, nanocatalysis, nanomembranes, nanoinitiatives and grand challenges remain

How to go from switches to machines

molecular switch ==> autonomous molecular machine

Panaceanano

Make a food grade product that replaces methanol from basic chemical component
For pharma, food and other



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