Fabrication And Investigation On Mechanical Properties Of Biomaterials

The fabrication and characterization of nano-materials are critical in the development of the nano science technology (NST). Arranged nano-wire arrays and anodic alumina nano porous films have raised lots of attentions because of their broad applications in nano-material fabrication. Furthermore, the progresses in these areas have boomed investigation interest in bionics. Gecko claw is a typical example that takes more care of people recently.This thesis contains two parts: (a) the fabrication and characterization of anodic alumina nano porous films for an innovative design of artificial kidney. Their mechanical properties are investigated in detail using a specifically designed experimental setup; (b) Study of artificial gecko foot, including the fabrication of dry adhesives using anodic alumina porous films, and the measurement of the dry adhesion generated by carbon nano-tube array and zinc oxide nano-line array. The major works of this thesis are listed below:1) Anodic alumina porous films, which fabricated by electrochemistry anodic aluminum oxide methods have wide applications in nano-material and nano-apparatus because of their fine structure. Anodic alumina porous films are fabricated in acid electrolyte by two-step electrochemical oxidating high pure aluminum sheet. It contains array of hexagonal pores perpendicular to the surface. The films thickness and the porous diameter can be pre-designed by modification of fabrication process. The diameter of the pores is in the range of 5 ~ 300 nanometers.2) The mechanical properties of nano porous films are critical for its applications. However, the report of their mechanical properties is quite limited. The reason lies in the large aspect ratios of their geometries that make both theoretical analysis and numerical simulation difficult. This article utilizes the experimental methods to study the static and dynamic mechanical properties of nano porous films. A budge testing setup is developed, and the temporal sequence speckle interferometry is used to measure the deformation of the films. The experimental results lead to the effective...