TOPIC: NANOTECHNOLOGY 8:38 PM OO T-Mobile F K Back Homer work 6.pdf Max Points:
ID: 1998369 • Letter: T
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TOPIC: NANOTECHNOLOGY 8:38 PM OO T-Mobile F K Back Homer work 6.pdf Max Points: 700 I. How does size scaling to nanoscale affect (i surface to volume ratio, (ii weight, (iii)natural frequency, and (iv) and electrostatic forces (00 2. Given a cantilevered beam of length L with a constant rectangular cross-section and applied distributed load of magnitude P, find: (10) a. The tip deflection ofthe beam (i.e. ufL), assuming a fixed-free boundary conditions. b. The stiffness parameter which relates the net force to the deflection found in part (a) 3. Describe typical SEM operating principle? Draw schematic representation of the optics in SEM. (10) 4. Describe and differentiate Secondary Electron, Backscattered Electrons, and X-rays in SEM? (15) 5. Describe the parameter that should be used as an input to the feedback loop in each of the following modes of operation of an AFM: Contact, Intermittent contact, and Non-contact. Briefly describe the behavior of the aforementioned parameter as the tip approaches the surface. Explain the physical reasons for these changes. (100 6. Describe the tip-sample interaction at each of the four indicated points on the following cantilever deflection versus separation distance curve. Draw simple sketches of the cantilever deflection (i.c..direction and relative magnitude ofcantilever bending) corresponding to each of the 4 points. i Force Tip moving away from the sample Tip-sample separation Courses Calendar To Do Notifications MessagesExplanation / Answer
(1)
(i)
The surface area of the materials increases with decreasing the size. So, the relative area of the nanomaterials is larger than the same volume or mass of the larger form materials. The surface area of the materials of a given volume increases by dividing into the smaller pieces. Thus, the surface to volume ratio increases in Nano-scaling compared to larger scaling.
(ii)
When divided into the smaller pieces, the gravitational affect can be neglected. Therefore, the weight is negligible in the case of Nano-scaling compared to larger scaling.
(iii)
Scattering phenomenon can be considered Nano-scaling. So, the energy of the light scattered with the materials decreases. So, the frequency of the material decreases in the case of Nano-scaling compared to larger scaling.
(iv)
The charge of a neutral larger material is zero. In the case of Nano-scaling, the materials involve the ion-ion and ion-dipole interactions. So, the electrostatic forces increase in the case of Nano-scaling compared to larger scaling.
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