Presentation on theme: "Nanotechnology:Data Storage Activity and Other Topics Nanotechnology:Data Storage Activity and Other Topics Mark Tuominen Professor of Physics Science."— Presentation transcript:
Nanotechnology:Data Storage Activity and Other Topics Nanotechnology:Data Storage Activity and Other Topics Mark Tuominen Professor of Physics Science Saturday, Sept. 12, 2009: Part 2
Magnetic Data Storage A computer hard drive stores your data magnetically Disk NS direction of disk motion Write Head 0010100110__ Bits of information NS Read Head Signal current
Binary Representation of Data one bit1 or 0 only 2 choices two bits00, 01, 10, 11 4 choices three bits 000, 001, 010, 011, 100, 101, 110, 111 8 choices n bits has 2 n choices For example, 5 bits has 2 5 = 32 choices... more than enough to represent all the letters of the alphabet
Binary representation of lower case letters 5-bit "Super Scientist" code: ex: k = 01011 0 1 011 S N S N S N N S N S OR (Coding Activity: Use attractive and repulsive forces to "read" the magnetic data!)
Nanotechnology and Nanoscience: People from diverse fields working together to provide new solutions to problems facing society Physics Chemistry Biology Materials Science Polymer Science Electrical Engineering Chemical Engineering Mechanical Engineering Medicine And others Electronics Materials Health Chemical Environmental Energy Food Aerospace Automotive Security Forest products
Solar Cells Konarka Benefit: Sun is an unlimited source of electronic energy.
Electric Solar Cells p-n junction interface cross-sectional view n-type silicon p-type silicon + - Sunlight Voltage load Current The electric power produced is proportional to the area of the solar cell - - - -- - - - + + + ++ + + + 0.5 Volt
Nanostructured Solar Cells + - Sunlight Voltage load Current More interface area - More power!
How to measure nanoscale objects? (One example: The Atomic Force Microscope)
(Atomic Force Microscope) "Optical Lever" Principle To determine amplification factor, use the concept of similar triangles laser pointer
"Optical Lever" y1y1 x1x1 y2y2 x2x2 For example, if the laser pointer is 2" long, and the wall is 17' (204") away, Motion amplified by 100 times!
. "Optical Lever" for Profilometry cantilever laser
. "Optical Lever" for Profilometry cantilever laser Long light path and a short cantilever gives large amplification
. Analysis: Distance Multiplier cantilever laser Long light path and a short cantilever gives large amplification d1d1 d2d2 L1L1 L2L2 pivot point The distance amplification d 2 / d 1 is proportional to L 2 / L 1
Atomic Force Microscope Diblock AFM image µm Copolymer tip
Atomic Force Microscope AFM Cantilever Chip AFM Instrument Head Laser Beam PathCantilever Deflection
A Message for Students Nanotechnology will change practically every part of our lives. It is a field for people who want to solve technological challenges facing societies across the world
NSF Center for Hierarchical Manufacturing ResearchEducationOutreach A Center on Nanomanufacturing at UMass www.umass.edu/chm (including videos on nanoscience)