1. Introduction to Nanotechnology Module 6 Atomic and Molecular Structure Material Properties

2. Source: Life on Earth biology textbook

10. 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 down AND The individual atoms may be vibrating or moving

11. So why don’t materials made out of these types of molecules just fall apart? Because bonds are formed in between the individual chains. These bonds provide elasticity, strength and cohesiveness to the structure.

12. Types of Unit Cells Cubic Unit Cell  a = b = c  α = β = γ = 90 0 Tetragonal  a =b ≠ c  α = β = γ = 90 0 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

13. Types of Unit Cells (Cont.) Orthorhombic  a ≠ b ≠ c  α = β = γ = 90 0 Rhombohedral  a =b = c  α = β = γ ≠ 90 0 Simple Base Centered Face Centered Body 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

14. Hexagonal  a ≠ b ≠ c  α = β = γ = 90 0 Monoclinic  a ≠ b ≠ c  α = β = γ = 90 0 Triclinic  a ≠ b ≠ c  α = β = γ = 90 0 Types of Unit Cells (Cont.) Simple Base Centered 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

15. Material Properties Strength Elasticity Rigidity Hardness Electrical conductivity Thermal conductivity

16. 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.