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Lecture 1

BIOTECH 4BL3 Lecture Notes - Lecture 1: Materials Science, Hydrogen Bond, BiocompatibilityPremium

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BIOTECH 4BL3 Biomaterials and Biocompatibility Lecture 1
Material Science investigates relationship between materials structure and properties
Material Engineering based on materials science, designing and engineering the materials structure to
produce desired properties via processing
Atomic Electronic cannot change the processing to change this material
Lattice crystal structure, has specific chemical, magnetic, electrical, and mechanical properties
Microscopic grains, secondary influence mechanical properties
Bulk Naked eye
Strong Chemical Bonds
-generally covalent and ionic bonds are described as the strongest bonds
Covalent Bonding
-Formed when atoms share valence electrons to satisfy partially filled orbitals
-More overlap of valence shells = stronger covalent bonds
-Highly directional and can be very strong
Ionic Bonding
-Formed by exchange of electrons between metallic and non-metallic atoms
-Metallic atoms donate electrons and become positive ions
-Non-metallic atoms receive electrons and become negative ions
-The strong repulsive forces of like ions limit the atomic arrangement of ionic solids
Strong Chemical Bonds
-In a metallic bond, binding electrons are delocalized over a lattice of atoms. In contract, in ionic
compounds the locations of the binding electrons and their charges are localised. Because of
delocalization or the free moving of electrons, it leads to the metallic properties such as conductivity,
ductility, and hardness.
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