Chem120A+Notes+-+Surfaces - Protection against chemical or...

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Protection against chemical or physical change Surfaces Accelerate Chemical or Physical change
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SURFACE SCIENCE PROPERTIES DRIVEN TECHNOLOGIES Catalysts CHEMICAL Absorbers Biointerfaces SURFACE SCIENCE MECHANICAL Coatings Molecular Studies ELECTRICAL Microelectronics Xerography OPTICAL Optical Fiber MAGNETIC Storage Disk Drive
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A UTOMOBILE C ATALYTIC C ONVERTER Pt -CH 2 -+3/2O 2 ----> CO 2 + H 2 O Pt CO + 1/2 O 2 ----> CO 2 Rh 2CO + 2NO ----> N 2 + 2CO 2 CeO 2 promoter to provide oxygen at cold start
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Reforming with Pt Catalyst 110 93 78 Octane Rating N/A
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~100 μ m Micropore (~4 Å) Micropore (~1 μ m) Binder Turbostatic Amorphous Carbon O 2 N 2 Air O 2 N 2 Air Zeolite Carbon Molecular Sieve Gas Size (Å) Heat of Adsorption in Li or Ca Zeolite (kcal/mol) O 2 3.46 ~ 3 N 2 3.64 ~ 7 Air Separation
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Water Purification
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Pentium 4
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And the Shrink Goes On….
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Device Feature Size Scaling Intel continues to introduce new technology ever 2 years Maintain 0.7X feature size reduction Enabled by advancement in lithography and mask technologies www.intel.com \technology/silicon 1985 1990 1995 2000 2005 2010 2015 1000 100 10 nm Technology node in production 45 nm 32 nm 22 nm
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Head-Disk Interface C. M. Mate 10/05 Hitachi San Jose Research Center S l i d e r 1 . 0 m Recording Head > 10 m /s Air Bearing Lubricant Carbon Overcoat Magnetic Media 1 nm 4 nm 15 nm Physical Spacing 8 nm
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Contributors to the Magnetic Spacing ( Magnetic Spacing = Distance from top of media to bottom of head sensor) Static Contributors: – Sensor recession – Head overcoat – Lubricant or contamination on head – Clearance – Disk lubricant – Disk overcoat – Take-off height For current 2005 drives – ~ 100 Gb/in 2 Areal Density – magnetic spacing ~ 16 nm For 1 Tb/in 2 Areal Density – magnetic spacing < 7 nm Current Values (approx.) 1 nm 3 nm 1 nm 3 nm 1 nm 4 nm 3 nm 16 nm total magnetic spacing C. M. Mate 10/05 Hitachi San Jose Research Center
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fcc (111) fcc (755 ) fcc (10,8,7) External Surfaces Single Crystal Surfaces Green Leaf Surface
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Substrate Pt, Au Substrate Pt, Au Metal (M) evaporation MM M M Oxidation M M O OOO O O O O O Substrate Pt, Au MMM Substrate Pt, Au Substrate Pt, Au
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This note was uploaded on 09/28/2009 for the course CHEM 120A taught by Professor Whaley during the Spring '07 term at University of California, Berkeley.

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Chem120A+Notes+-+Surfaces - Protection against chemical or...

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