Examine the microstructure of the given ferrous sample and infer on the phases present. When
emery sheets are used for polishing why the order is 220, 400, 600, 800, 1000 and not 1000, 800,
600, 400, 220? Draw the microstructure.
Study the microstructure of the given ferrous sample and identify the sample. What are the phases
present? Draw the microstructure. What is the significance of magnification in microstructure
Examine the microstructure of the given ferrous sample and infer on the phases present. Identify the
sample and draw the microstructure. Mention some important application areas of this sample.
Observe the microstructure of red brass and yellow brass and explain the twin grain boundary. Draw
the microstructures. What is the difference between them? Write the application areas of these.
Observe the microstructure of aluminium alloy. Draw the dendritic microstructure. What are the
different grades of aluminium alloys used in Boeing Company for manufacturing passenger
aeroplanes? What are the advantages of these alloys so that t
What is the need for microstructure examination? Discuss the preparation procedure of ferrous
sample for microstructure examination. Mention some automobile application area where medium
carbon steel is used.
Lecture 4 Notes:
Like metallic implants, some polymers used in biomaterials
applications are susceptible to chemical reactions that lead to
degradation through hydrolysis. In many cases, a polymer is
specifically chosen for its ability to d
Lecture 3 Notes: Biomaterials Surfaces: Chemistry
Surfaces are high-energy regions of materials and thereby facilitate
chemical reactions that influence performance of biomaterials.
This lecture will focus on 2 classes of surface chemistry relevant to
Lecture 2 Notes: Biomaterials Surfaces: Physics
The surface of a material strongly dictates its performance in vivo.
Whats so special
Lecture 6 Notes:
Protein-Surface Interactions ( Part II)
The Langmuir model is applicable to numerous reversible adsorption
processes, but fails to capture many aspects of protein adsorption.
1. Competitive Adsorption
many different globular proteins in
Lecture 1 Notes: Intro. to Biomaterials:
Structural Hierarchy in Materials & Biology
What are biomaterials?
A good working definition from the text is: A nonviable material
used in a medical device, intended to interact with biological
Surface Modification of Biomaterials (Part II)
Surface Modification Methods
A. Plasma Treatments
Plasmas: ionized gases (ions, electrons, free radicals, atoms, molecules)
created by ion/electron impact under applied E-field: A + e A+ +
Lecture 7 Notes:
Cell-Surface Interactions: Host Responses to Biomaterials (Part 1)
Synthetic surfaces exposed to biological fluids adsorb proteins how
does this mediate the bodys ultimate response to a biomaterial?
Lecture 5 Notes:
Protein-Surface Interactions (Part 1)
Importance of Protein-Surface Interactions:
Modulate cell adhesion
Trigger the biological cascade resulting in foreign body
response Central to diagnostic assay/sensor device design &
Lecture 9 Notes:
Surface Modification of Biomaterials (Part 1)
Purpose: alter surface properties to enhance performance in
biological environment while retaining bulk properties of
1. clean a surface
2. reduce/eliminate protein
Lecture 8 Notes:
Cell-Surface Interactions: Host Responses to Biomaterials (Part II)
Implantation of a biomaterial initiates the inflammatory response:
- response of vascularized tissue to local injury
- severity indicates biocompatibility of material