19 Questions
What analytical tool can achieve atomic resolution?
Atomic force microscope
Which analytical tool is used for non-invasive imaging of a fetus?
Magnetic Resonance Imaging
Which biomaterial is best suited for probing mechanical properties of a polymer film?
Silicone
What type of imaging does a scanning electron microscope provide?
High resolution 3-D imaging
Which biomaterial has properties similar to Natural Ceramics?
Hydroxyapatite
Which analytical tool is used to probe the mechanical properties of materials at the nanoscale?
Nano-indenter
What is the main purpose of a nano-indenter in material testing?
To measure the hardness of a material
In the context of bone fractures, in which direction does a bone break most easily?
In the transverse direction, perpendicular to the long axes of the osteons
Which imaging technique is NOT suitable for imaging a tissue sample in 3D?
Optical Tweezers
How can the mechanical properties of a single protein molecule be determined?
Using Atomic Force Microscope or Scanning Electron Microscope
What type of material selection map can help in choosing the best substitute for ligament?
Biomaterials selection map based on Young's Modulus and Density
Which imaging technique is suitable for 3D imaging of a tissue sample?
Magnetic Resonance Imaging
Explain the Maxwell Model for a viscoelastic material and derive the relationship between stress (σ) and strain (ε) in terms of the spring's Young's modulus (E) and dashpot's coefficient of viscosity (η).
The Maxwell Model consists of a spring and a dashpot in series. The relationship between stress (σ) and strain (ε) is σ = Eε + η(dε/dt)
Describe the Kelvin-Voight Model for a viscoelastic material and derive the relationship between stress (σ) and time (t) when the material undergoes a step strain change.
In the Kelvin-Voight Model, a spring and dashpot are connected in parallel. The relationship between stress and strain is σ = hε + Eε. The relationship between total stress (σ) and time (t) is σ = σ0 + (E/η)ε0(1-e^(-tη/E)).
Explain the use and principle of an atomic force microscope (AFM) in biomedical engineering.
AFM is used to image surfaces at the nanoscale by scanning a sharp tip over the sample. It measures forces between the tip and the sample, providing high-resolution topographical and mechanical information.
Discuss the role of a scanning electron microscope (SEM) in biomaterial analysis and characterization.
SEM is used to obtain high-resolution images of biomaterial surfaces by scanning a focused electron beam. It provides detailed information on surface morphology and composition.
Explain the purpose and function of a nano-indenter in the field of biomaterials.
A nano-indenter is used to measure the mechanical properties of biomaterials at the nanoscale by applying controlled forces and measuring the resulting indentation depth. It helps assess hardness, elasticity, and other mechanical characteristics.
Describe the significance of a material selection map in the context of biomaterials.
A material selection map helps in choosing appropriate biomaterials based on their properties and the specific requirements of a biomedical application. It visualizes the trade-offs between different material characteristics to guide material selection.
Explain the principle of magnetic resonance imaging (MRI) and its application in biomedical diagnostics.
MRI uses strong magnetic fields and radio waves to generate detailed images of internal body structures. It is valuable for non-invasive imaging and diagnosis of various medical conditions.
Learn when to use the Maxwell model or the Kelvin-Voight model to describe the viscoelasticity of solid bone material. Explore the differences between the models and understand which one is more suitable for characterizing the behavior of bone material.
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