BIOMATERIALS

WHAT IS BIOMATERIAL?

• material of natural or man-made origin that are used to directly supplement or replace the functions of living tissue.

• material such as bone, skin, or artery produced by a biological system.

• material that interacts with biological systems which cause degeneration of tissue.

• material that can be decomposed by nature by any biological means.

Physical properties of polymer materials include (you may choose more than one answer);

• poor conductivity

• strength and ductility do not vary

• low in density

• high decomposition temperature

Covalent bonding occurs due to

• pairs of electrons are shared by atoms

• electrostatic force of attraction between cations and anions

• attractions of electric dipoles in atoms or molecules

• formation of temporary dipoles due to constant movement of

  electrons

Select the types of crystalline structure in materials (you may choose more than one):

• Body Centered Cubic

• Face Centered Cubic

• Hexagonal Close Packed

• Pentagonal Close Packed

Face Centered Cubic crystal structure is

• represented as one atom at each corner of cube and at the center of each cube face

• represented as one atom at each corner of cube and one at

  the center of cube

• represented as one atoms at each corner of cube and two atoms at the center of each cube face

• represented as one atom at each corner of cube and two at

  the center of cube

Optical properties of a material are

• the interaction of electromagnetic radiation in visible light

• the interaction of electron radiation in visible light

• the interaction of electromagnetic in high frequency

• the interaction of visible light in the high energy

What is heat capacity of a material?

For a cooking pan holder, should it be made with low or high heat capacity material?

• Amount of heat to be supplied to a given mass of a material to produce a unit of change in its temperature.

  Cooking pan holder should be made of material with low heat capacity.

• Amount of heat to be supplied to a given mass of a material to produce a unit of change in its temperature.

  Cooking pan holder should be made of material with high heat capacity.

What is electrical resistivity ?

• A measure of the amount of electrical current a material can carry. 

• A measure of resistance of material to electrical current conduction that flows through the material. 

What is porosity?

• A measure of void space in a structure.

• A state or quantity of material being densed.

• A measure of filled space in a structure.

What is the direction indices from these two points : origin (0,0,0), emergence (1, 1/2, 1) ?

• [1 1/2 1]

• [2 1 2]

• [2,1,2]

• [1, 1/2, 2]