{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

case 5 hw answers_1 - BMED 2100 Biomaterials Science...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
04/14/09 1 BMED 2100 Biomaterials Science & Engineering Spring 2009 Case Study #5: Answers to HW questions 5. ANSWER – see Maple file output at end. Table 4.2 comes from the Ph.D. thesis (1993) by a former doctoral student at Rensselaer, Mary Beth Schmidt. The Table shows contact angles measured for captive air bubbles on different biomaterial surfaces immersed in water and glycerol. These data were used to calculate surface energy according to the method explained in the excerpt, below, from Mary Beth’s Ph.D. thesis (see indented section , below). Read her method, and then use appropriate data from the Table to solve equations (3.2a) and (3.2b) simultaneously for the two unknowns γ 1 d and γ 1 p , which are the so-called dispersive ( γ 1 d ) and polar ( γ 1 p ) components of the surface energy of “biomaterial 1”, where γ 1 d + γ 1 p = γ 1 . Although Table 4.2 shows data from 3 different biomaterials (cp Ti, Ti-6Al-4V, and Synamel, which is a form of hydroxyapatite), compute your results for “biomaterial 1” , Synamel. Show that your values for γ 1 d , γ 1 p , and γ 1 agree with Mary Beth’s results for the as-prepared version of Synamel in Table 4.2. Excerpt from the Ph.D. thesis entitled “In vitro cell attachment and detachment behavior for selected biomaterials” by Mary Beth Schmidt, BME, RPI, 1993. The contact angle was determined indirectly, based on the geometry of a captive air bubble on the immersed biomaterial surface (Figure 3.3). The bubbles were approximately 40 µ l in volume and were assumed to be spherical. The image of the captive bubble was digitized using a video camera (Sony DXC-1821, Japan), equipped with a macro lens (1:3.5, f = 50mm, Olympus, Japan), and PC-based image analysis software (Image Pro IT, Media Cybernetics, Rockville, MD). The digitized image was displayed on a high- resolution monitor (Sony PVM-I9 10). Bubble height (h) and contact radius (r) were
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern