| Nano-diamond-poly(vinyl alcohol) nanocomposites for biomedical applications |
| Paper ID : 1030-UFGNSM-FULL |
| Authors: |
|
Masoud Frounchi *1, Susan Dadbin2, Sara Haddadi3 1Azadi street 2Radiation Applications Research School, Nuclear Sci. & and Tech. Research Institute 3Department of Chemical & Petroleum Eng., Sharif University of Technology |
| Abstract: |
| In this research work, poly(vinyl alcohol) and nano-diamond, PVA/ND, nanocomposite films were prepared at various concentrations ranging from 0.25 to 3 wt% ND. The films were characterized by X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM) and mechanical measurements. It was found that nano-diamond particles were uniformly dispersed within poly(vinyl alcohol) indicating interfacial interactions between untreated nano-diamond particles and poly(vinyl alcohol) matrix. It was postulated that the interfacial interactions occur through forming hydrogen bonds between hydroxyl groups of poly(vinyl alcohol) molecules and the functional groups that exist on the surface of nano-diamond particles. Tensile modulus and strength of the nanocomposite films were improved over the neat PVA film with the addition of only 0.5% nano-diamond with only small loss in ductility. By increase in nano-diamond content up to 3% the gain in modulus and strength was only slightly over that of 0.5% ND but the loss in elongation was significant. Thus the optimum concentration of untreated nano-diamond was about 0.5%. While glass transition and melting temperatures of PVA showed small increase about 1-2°C at 0.75% ND, the gain in crystallinity of PVA was somewhat significant suggesting nucleating effect of nano-diamond particles. In another set of experiments nanocomposites of cross-linked poly(vinyl alcohol) , PVA hydrogels, and nano-diamond particles were prepared by gamma irradiation. The suitability of the resultant nanocomposites were investigated for biomedical applications such as a prosthetic material for replacement of the degenerated inner core of the vertebral disc. |
| Keywords: |
| nano-diamond, poly(vinyl alcohol), nanocomposite, |
| Status : Paper Accepted (Poster Presentation) |
