introduction to nanotechnology module 6 atomic and molecular structure material properties
TRANSCRIPT
Introduction to Nanotechnology
Module 6
Atomic and Molecular Structure
Material Properties
Source: Life on Earth biology textbook
Source: Life on Earth biology textbook
Source: Life on Earth biology textbook
Source: Life on Earth biology textbook
Source: Life on Earth biology textbook
Source: Life on Earth biology textbook
Source: Life on Earth biology textbook
Crude representation of collagen, cellulose, or a plastic polymer (and many other types of materials)
In reality this molecule is moving. . .•Left and right (stretching)•Wobbling back and forth•Vibrating up and downANDThe individual atoms may be vibrating or moving
So why don’t materials made out of these types of molecules just fall apart?
Because bonds are formed in between theindividual chains.These bonds provide elasticity, strength and cohesiveness to the structure.
Types of Unit Cells
• Cubic Unit Cell a = b = c α = β = γ = 900
• Tetragonal a =b ≠ c α = β = γ = 900
Simple
Body Centered
Face Centered
Simple Body Centered
3-4
Source: W.G. Moffatt, G.W. Pearsall, & J. Wulff, “The Structure and Properties of Materials,” vol. I: “Structure,” Wiley, 1964, p. 47.
Figure 3.2
Types of Unit Cells (Cont.)• Orthorhombic
a ≠ b ≠ c α = β = γ = 900
• Rhombohedral a =b = c α = β = γ ≠ 900
SimpleBase Centered
Face CenteredBody Centered
Simple
3-5
Source: W.G. Moffatt, G.W. Pearsall, & J. Wulff, “The Structure and Properties of Materials,” vol. I: “Structure,” Wiley, 1964, p. 47.
Figure 3.2
• Hexagonal
a ≠ b ≠ c α = β = γ = 900
• Monoclinic a ≠ b ≠ c α = β = γ = 900
• Triclinic a ≠ b ≠ c α = β = γ = 900
Types of Unit Cells (Cont.)
Simple
Simple
Simple
BaseCentered
3-6
Source: W.G. Moffatt, G.W. Pearsall, & J. Wulff, “The Structure and Properties of Materials,” vol. I: “Structure,” Wiley, 1964, p. 47.
Figure 3.2
Material Properties• Strength• Elasticity• Rigidity• Hardness• Electrical conductivity• Thermal conductivity
References• Poole, Charles P., and Frank J. Owens. Introduction to Nanotechnology. Hoboken,
NJ: J. Wiley, 2003.
• Wilson, Michael. Nanotechnology: Basic Science and Emerging Technologies. Boca Raton: Chapman & Hall/CRC, 2002.