MIT 3 052 - Assignment 4 (2 pages)

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Assignment 4



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Assignment 4

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Pages:
2
School:
Massachusetts Institute of Technology
Course:
3 052 - Nanomechanics of Materials and Biomaterials
Nanomechanics of Materials and Biomaterials Documents

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3 052 Nanomechanics of Materials and Biomaterials Assignment 4 Due 04 24 07 3 052 Nanomechanics of Materials and Biomaterials Spring 2007 Assignment 4 Due Date Thursday 04 24 07 midnight on Stellar Course WebPage You are encouraged to use additional resources e g journal papers internet etc but please cite them points will be deducted for not doing so You will need to research additional sources to answer some questions Everything must be answered in your own words also do not copy phrases or sentences from the paper or podcast 5 extra credit for posting a message on one of the podcast message boards 1 van der Waals Forces at Work Gecko Feet Adhesion Tian et al PNAS 2006 99 1225212256 a Equation 16 gives an alternative geometry for calculating the van der Waals adhesion force Define the assumed geometry and all constants according to the schematic in Figure 1i and then use equation 16 to recreate the plot shown in Figure 4 b How do Figures 5 and 6 explain the roll in roll out mechanism for gecko walking c From the Discovery Channel movie on Professor Autumn Kellar posted on stellar i Explain what was meant by the gecko hairs become one with the wall ii Explain what was meant by the gecko is the Bermuda triangle of biology iii Name a number of potential applications for the fundamentals behind gecko feet adhesion iv What is the Mecko Gecko v Name 3 other types of biological adhesion mechanisms and the animals that use them 2 Boundary Lubrication Podcast Hydration Forces Briscoe et al Boundary Lubrication Under Water Nature 444 9 November 2006 191 194 a Research 3 different definitions of boundary lubrication and 3 different technological applications where boundary lubrication is relevant cite all sources Professor Klein proposes that ions can behave as molecular ball bearings in boundary lubrication Explain this analogy b Professor Klein mentioned that one can not take pictures with the SFA like the AFM can In a few sentences explain why not c Professor Klein states



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