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BME 444 MATSE 404 Questions And Answers
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BME 444 MATSE 404 Questions And Answers
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Solution 2024/2025Pepper
BME 444/ MATSE 404 Questions And Answers
In the case study on the blood clot adhesion, what does the addition of citrate to the blood do (Select all answers that
apply)? ANS✔✔ Inhibit clotting
In the blood clot adhesion study, what does the addition of calcium do (Select all answers that apply)? ANS✔✔ Promote
clotting
In the Case Study 1, what is the difference between the response of clotted blood in the blood clot adhesion study for
the hydrophobic and hydrophilic tubes(Select all answers that apply)? ANS✔✔ Hydrophobic tubes lead to cellular
adhesion when the clotted blood is removed;
Hydrophilic tubes lead to no attached cells when the clot is removed;
In the Case Study 1, after treatment in the plasma, with XPS determinations, what elements were detected on the
polystyrene surface (Select all answers that apply)? ANS✔✔ Oxygen; Carbon;
After treatment with oxygen plasma, what was the adhesion tension value for the polystyrene (Select all that apply)?
ANS✔✔ The adhesion tension reached a steady state of about 70 ergs/cm2 for the hydrophilic surface; The adhesion
tension was nearly zero for the as-received hydrophobic surface; The hydrophilic adhesion tension correlated with low
contact angles with water;
The water of hydration (Select all that apply): Generally, increases the effective diameter of anions and cations; Is more
important for the smaller cations than the larger anions; Is usually indicated by the (aq) given after ions such as Ca2+(aq)
without specifying the hydration number; In general, has a lower surface tension in aqueous solution the more
hydration the cation has ANS✔✔ All of the above;
The greater the charge to diameter ratio, the stronger the intermolecular ion-dipole for ions with water molecules are
(True or False)? ANS✔✔ True
What does like dissolves like mean (Select all that apply)? The same functional groups on a molecule and a solvent
molecule leads to higher solubility; Similar types of intermolecular interactions such as dipole-dipole for a solute -
solvent systems do not need to be identical functional groups to promote solubility; The strongest solvation interaction
, Solution 2024/2025
Pepper
energy for dissolution reactions is given by ion-ion interactions; All of the above; None of the above. ANS✔✔ All of the
above
The relative intermolecular interaction strength follows as: Covalent~Ionic > ion-dipole > ion-induced dipole > dipole-
dipole> dipole-induced dipole > induced dipole-induced dipole (True or False)? ANS✔✔ True
Name the intermolecular interaction(s) between an uncharged 5-fluorouracil molecule and water at solution pH 7
(Select all that apply). ANS✔✔ Dipole-dipole; Dipole-induced dipole; Induced dipole-induced dipole.
Dipole-dipole; Dipole-induced dipole; Induced dipole-induced dipole.
Select all of the definitions that apply for a surface. ANS✔✔ The two-dimensional locus of points located in three-
dimensional space; The outer or the topmost boundary of an object; A material layer constituting such a boundary; A
portion of space having length and breadth but no thickness; All of the above;
{All of the above}
What does 'SIMS' mean? ANS✔✔ Secondary Ion Mass Spectroscopy
What technique(s) can be used to determine surface energetics including contact angle and surface energy at the liquid-
vapor interface (Select all that apply)? ANS✔✔ Pendent drop;
Contact angle goniometry with dynamic tensiometry to determine glv;
Three essential tools for characterizing biomaterial surfaces are (Only one answer): ANS✔✔ Spectroscopy, Microscopy,
Tensiometry;
What is contact angle hysteresis (Select all that apply)? ANS✔✔ Surfaces not exhibiting a single unique contact angle;
A maximal advance angle and a minimal receding angle are observed;
Hysteresis associated with surface roughness and/or chemical heterogeneities;
For contact angle determinations and adhesion tension (Select all that apply): ANS✔✔ Contact angle goniometry,
Surface tension, Dynamic tensiometry,
, Solution 2024/2025
Pepper
XPS has which of the following features (Select all that apply) ANS✔✔ Detection of Li-U; Sensitive to differences in
chemical environment; Surface sensitive (10-100Å sampling depth); Quantitative without the use of standards; Minimal
charging problems with insulators;
{All of the above}
The physical basis for X-ray photoelectron spectroscopy (XPS) is (Select all that apply): ANS✔✔ High intensity photons
are used to excite inner shell electrons; The kinetic energy of photoelectrons is measured; The binding energy is
determined for photoelectrons based on the kinetic energy, photon energy, and work function;
{All of the above}
XPS, of all the high energy particle interrogation methods, can uniquely (Select all that apply): ANS✔✔ Determine
species and/or valence states;
XPS can detect most elements (Li-U) because (Select all that apply). ANS✔✔ The excitation photons with wavelength at
about 1,500 eV having similar energy to the range of binding energies for most elements.
One of the major limitations of XPS is: ANS✔✔ The depth of interrogation often leads to a diluting effect of the atoms in
the first monolayer of a material;
What did the graphic, "The Great Colloid Schism" depict in the Israelachvili JCIS manuscript from 1977? ANS✔✔ The
many different schools of thought and theories in 1977 about how to predict and use intermolecular interactions.
The best geometry to understand how a cell interacts with a surface is: ANS✔✔ Two flat surfaces interacting.
For the interaction of two flat plates, the interaction energy is proportional to the separation distance to the
____________power? ANS✔✔ To the -2 power.
In physiological environments, for all practical purposes, the van der Waals interactions are always positive. ANS✔✔
True
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