Biomaterials Lecture 1

Question 1

♣ Types of materials

Answer 1

• Metals
• Ceramics (M+X compostion)
• Polymers (long chains usually organic)
• Composites (physical mixtures)

Question 2

• Structure of materials

Answer 2

• Arrangement (crystallinity)
• Bonding (type of charater)
• Compostion
• Defects

Question 3

• Properties of materials:

Answer 3

• Physical (structure and bonding)
• Mechanical (deformation characteristics)
• Chemcial (reactivity)
• Biological (biocompatibility)

Question 4

•What is the bond energies effect on melting T, CTE, and elastic modulus?

Answer 4

• > bond energy higher melting temp lower CTE and higher elastic modulus

Question 5

• What does the difference in electronegativity have to be for ionic?

Answer 5

• >1.7

Question 6

• What contributes to secondary bonding?

Answer 6

• Dipoles, hydrogen, chelation bonding

Question 7

• What are the characteristics of a crystalline structure and what does it depend on?

Answer 7

• Lowest energy state, depends on time, temperature and symmetry

Question 8

• What is the definition of crystalline defects?

Answer 8

• Imperfections in repetition of crystalline arrangements

Question 9

♣ Point defects?

Answer 9

• Vacancies, Substitutional Defects, Self-interstitial defects(misplaced), interstitial defects (between atoms)

Question 10

♣ Line defects?

Answer 10

• Edge dislocations, screw dislocations, mixed dislocations

Question 11

♣ Area defects

Answer 11

• Stacking faults, low angle boundaries, high angle boundries

Question 12

♣ Volume defects

Answer 12

• Voids, pores(small), holes, pits, crazes, cracks